| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-syntax-0.7.2/src/ast/parse.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>parse.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../regex_syntax/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../regex_syntax/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| <span id="5678">5678</span> |
| <span id="5679">5679</span> |
| <span id="5680">5680</span> |
| <span id="5681">5681</span> |
| <span id="5682">5682</span> |
| <span id="5683">5683</span> |
| <span id="5684">5684</span> |
| <span id="5685">5685</span> |
| <span id="5686">5686</span> |
| <span id="5687">5687</span> |
| <span id="5688">5688</span> |
| <span id="5689">5689</span> |
| <span id="5690">5690</span> |
| <span id="5691">5691</span> |
| <span id="5692">5692</span> |
| <span id="5693">5693</span> |
| <span id="5694">5694</span> |
| <span id="5695">5695</span> |
| <span id="5696">5696</span> |
| <span id="5697">5697</span> |
| <span id="5698">5698</span> |
| <span id="5699">5699</span> |
| <span id="5700">5700</span> |
| <span id="5701">5701</span> |
| <span id="5702">5702</span> |
| <span id="5703">5703</span> |
| <span id="5704">5704</span> |
| <span id="5705">5705</span> |
| <span id="5706">5706</span> |
| <span id="5707">5707</span> |
| <span id="5708">5708</span> |
| <span id="5709">5709</span> |
| <span id="5710">5710</span> |
| <span id="5711">5711</span> |
| <span id="5712">5712</span> |
| <span id="5713">5713</span> |
| <span id="5714">5714</span> |
| <span id="5715">5715</span> |
| <span id="5716">5716</span> |
| <span id="5717">5717</span> |
| <span id="5718">5718</span> |
| <span id="5719">5719</span> |
| <span id="5720">5720</span> |
| <span id="5721">5721</span> |
| <span id="5722">5722</span> |
| <span id="5723">5723</span> |
| <span id="5724">5724</span> |
| <span id="5725">5725</span> |
| <span id="5726">5726</span> |
| <span id="5727">5727</span> |
| <span id="5728">5728</span> |
| <span id="5729">5729</span> |
| <span id="5730">5730</span> |
| <span id="5731">5731</span> |
| <span id="5732">5732</span> |
| <span id="5733">5733</span> |
| <span id="5734">5734</span> |
| <span id="5735">5735</span> |
| <span id="5736">5736</span> |
| <span id="5737">5737</span> |
| <span id="5738">5738</span> |
| <span id="5739">5739</span> |
| <span id="5740">5740</span> |
| <span id="5741">5741</span> |
| <span id="5742">5742</span> |
| <span id="5743">5743</span> |
| <span id="5744">5744</span> |
| <span id="5745">5745</span> |
| <span id="5746">5746</span> |
| <span id="5747">5747</span> |
| <span id="5748">5748</span> |
| <span id="5749">5749</span> |
| <span id="5750">5750</span> |
| <span id="5751">5751</span> |
| <span id="5752">5752</span> |
| <span id="5753">5753</span> |
| <span id="5754">5754</span> |
| <span id="5755">5755</span> |
| <span id="5756">5756</span> |
| <span id="5757">5757</span> |
| <span id="5758">5758</span> |
| <span id="5759">5759</span> |
| <span id="5760">5760</span> |
| <span id="5761">5761</span> |
| <span id="5762">5762</span> |
| <span id="5763">5763</span> |
| <span id="5764">5764</span> |
| <span id="5765">5765</span> |
| <span id="5766">5766</span> |
| <span id="5767">5767</span> |
| <span id="5768">5768</span> |
| <span id="5769">5769</span> |
| <span id="5770">5770</span> |
| <span id="5771">5771</span> |
| <span id="5772">5772</span> |
| <span id="5773">5773</span> |
| <span id="5774">5774</span> |
| <span id="5775">5775</span> |
| <span id="5776">5776</span> |
| <span id="5777">5777</span> |
| <span id="5778">5778</span> |
| <span id="5779">5779</span> |
| <span id="5780">5780</span> |
| <span id="5781">5781</span> |
| <span id="5782">5782</span> |
| <span id="5783">5783</span> |
| <span id="5784">5784</span> |
| <span id="5785">5785</span> |
| <span id="5786">5786</span> |
| <span id="5787">5787</span> |
| <span id="5788">5788</span> |
| <span id="5789">5789</span> |
| <span id="5790">5790</span> |
| <span id="5791">5791</span> |
| <span id="5792">5792</span> |
| <span id="5793">5793</span> |
| <span id="5794">5794</span> |
| <span id="5795">5795</span> |
| <span id="5796">5796</span> |
| <span id="5797">5797</span> |
| <span id="5798">5798</span> |
| <span id="5799">5799</span> |
| <span id="5800">5800</span> |
| <span id="5801">5801</span> |
| <span id="5802">5802</span> |
| <span id="5803">5803</span> |
| <span id="5804">5804</span> |
| <span id="5805">5805</span> |
| <span id="5806">5806</span> |
| <span id="5807">5807</span> |
| <span id="5808">5808</span> |
| <span id="5809">5809</span> |
| <span id="5810">5810</span> |
| <span id="5811">5811</span> |
| <span id="5812">5812</span> |
| <span id="5813">5813</span> |
| <span id="5814">5814</span> |
| <span id="5815">5815</span> |
| <span id="5816">5816</span> |
| <span id="5817">5817</span> |
| <span id="5818">5818</span> |
| <span id="5819">5819</span> |
| <span id="5820">5820</span> |
| <span id="5821">5821</span> |
| <span id="5822">5822</span> |
| <span id="5823">5823</span> |
| <span id="5824">5824</span> |
| <span id="5825">5825</span> |
| <span id="5826">5826</span> |
| <span id="5827">5827</span> |
| <span id="5828">5828</span> |
| <span id="5829">5829</span> |
| <span id="5830">5830</span> |
| <span id="5831">5831</span> |
| <span id="5832">5832</span> |
| <span id="5833">5833</span> |
| <span id="5834">5834</span> |
| <span id="5835">5835</span> |
| <span id="5836">5836</span> |
| <span id="5837">5837</span> |
| <span id="5838">5838</span> |
| <span id="5839">5839</span> |
| <span id="5840">5840</span> |
| <span id="5841">5841</span> |
| <span id="5842">5842</span> |
| <span id="5843">5843</span> |
| <span id="5844">5844</span> |
| <span id="5845">5845</span> |
| <span id="5846">5846</span> |
| <span id="5847">5847</span> |
| <span id="5848">5848</span> |
| <span id="5849">5849</span> |
| <span id="5850">5850</span> |
| <span id="5851">5851</span> |
| <span id="5852">5852</span> |
| <span id="5853">5853</span> |
| <span id="5854">5854</span> |
| <span id="5855">5855</span> |
| <span id="5856">5856</span> |
| <span id="5857">5857</span> |
| <span id="5858">5858</span> |
| <span id="5859">5859</span> |
| <span id="5860">5860</span> |
| <span id="5861">5861</span> |
| <span id="5862">5862</span> |
| <span id="5863">5863</span> |
| <span id="5864">5864</span> |
| <span id="5865">5865</span> |
| <span id="5866">5866</span> |
| <span id="5867">5867</span> |
| <span id="5868">5868</span> |
| <span id="5869">5869</span> |
| <span id="5870">5870</span> |
| <span id="5871">5871</span> |
| <span id="5872">5872</span> |
| <span id="5873">5873</span> |
| <span id="5874">5874</span> |
| <span id="5875">5875</span> |
| <span id="5876">5876</span> |
| <span id="5877">5877</span> |
| <span id="5878">5878</span> |
| <span id="5879">5879</span> |
| <span id="5880">5880</span> |
| <span id="5881">5881</span> |
| <span id="5882">5882</span> |
| <span id="5883">5883</span> |
| <span id="5884">5884</span> |
| <span id="5885">5885</span> |
| <span id="5886">5886</span> |
| <span id="5887">5887</span> |
| <span id="5888">5888</span> |
| <span id="5889">5889</span> |
| <span id="5890">5890</span> |
| <span id="5891">5891</span> |
| <span id="5892">5892</span> |
| <span id="5893">5893</span> |
| <span id="5894">5894</span> |
| <span id="5895">5895</span> |
| <span id="5896">5896</span> |
| <span id="5897">5897</span> |
| <span id="5898">5898</span> |
| <span id="5899">5899</span> |
| <span id="5900">5900</span> |
| <span id="5901">5901</span> |
| <span id="5902">5902</span> |
| <span id="5903">5903</span> |
| <span id="5904">5904</span> |
| <span id="5905">5905</span> |
| <span id="5906">5906</span> |
| <span id="5907">5907</span> |
| <span id="5908">5908</span> |
| <span id="5909">5909</span> |
| <span id="5910">5910</span> |
| <span id="5911">5911</span> |
| <span id="5912">5912</span> |
| <span id="5913">5913</span> |
| <span id="5914">5914</span> |
| <span id="5915">5915</span> |
| <span id="5916">5916</span> |
| <span id="5917">5917</span> |
| <span id="5918">5918</span> |
| <span id="5919">5919</span> |
| <span id="5920">5920</span> |
| <span id="5921">5921</span> |
| <span id="5922">5922</span> |
| <span id="5923">5923</span> |
| <span id="5924">5924</span> |
| <span id="5925">5925</span> |
| <span id="5926">5926</span> |
| <span id="5927">5927</span> |
| <span id="5928">5928</span> |
| <span id="5929">5929</span> |
| <span id="5930">5930</span> |
| <span id="5931">5931</span> |
| <span id="5932">5932</span> |
| <span id="5933">5933</span> |
| <span id="5934">5934</span> |
| <span id="5935">5935</span> |
| <span id="5936">5936</span> |
| <span id="5937">5937</span> |
| <span id="5938">5938</span> |
| <span id="5939">5939</span> |
| <span id="5940">5940</span> |
| <span id="5941">5941</span> |
| <span id="5942">5942</span> |
| <span id="5943">5943</span> |
| <span id="5944">5944</span> |
| <span id="5945">5945</span> |
| <span id="5946">5946</span> |
| <span id="5947">5947</span> |
| <span id="5948">5948</span> |
| <span id="5949">5949</span> |
| <span id="5950">5950</span> |
| <span id="5951">5951</span> |
| <span id="5952">5952</span> |
| <span id="5953">5953</span> |
| <span id="5954">5954</span> |
| <span id="5955">5955</span> |
| <span id="5956">5956</span> |
| <span id="5957">5957</span> |
| <span id="5958">5958</span> |
| <span id="5959">5959</span> |
| <span id="5960">5960</span> |
| <span id="5961">5961</span> |
| <span id="5962">5962</span> |
| <span id="5963">5963</span> |
| <span id="5964">5964</span> |
| <span id="5965">5965</span> |
| <span id="5966">5966</span> |
| <span id="5967">5967</span> |
| <span id="5968">5968</span> |
| <span id="5969">5969</span> |
| <span id="5970">5970</span> |
| <span id="5971">5971</span> |
| <span id="5972">5972</span> |
| <span id="5973">5973</span> |
| <span id="5974">5974</span> |
| <span id="5975">5975</span> |
| <span id="5976">5976</span> |
| <span id="5977">5977</span> |
| <span id="5978">5978</span> |
| <span id="5979">5979</span> |
| <span id="5980">5980</span> |
| <span id="5981">5981</span> |
| <span id="5982">5982</span> |
| <span id="5983">5983</span> |
| <span id="5984">5984</span> |
| <span id="5985">5985</span> |
| <span id="5986">5986</span> |
| <span id="5987">5987</span> |
| <span id="5988">5988</span> |
| <span id="5989">5989</span> |
| <span id="5990">5990</span> |
| <span id="5991">5991</span> |
| <span id="5992">5992</span> |
| <span id="5993">5993</span> |
| <span id="5994">5994</span> |
| <span id="5995">5995</span> |
| <span id="5996">5996</span> |
| <span id="5997">5997</span> |
| <span id="5998">5998</span> |
| <span id="5999">5999</span> |
| <span id="6000">6000</span> |
| <span id="6001">6001</span> |
| <span id="6002">6002</span> |
| <span id="6003">6003</span> |
| <span id="6004">6004</span> |
| <span id="6005">6005</span> |
| <span id="6006">6006</span> |
| <span id="6007">6007</span> |
| <span id="6008">6008</span> |
| <span id="6009">6009</span> |
| <span id="6010">6010</span> |
| <span id="6011">6011</span> |
| <span id="6012">6012</span> |
| <span id="6013">6013</span> |
| <span id="6014">6014</span> |
| <span id="6015">6015</span> |
| <span id="6016">6016</span> |
| <span id="6017">6017</span> |
| <span id="6018">6018</span> |
| <span id="6019">6019</span> |
| <span id="6020">6020</span> |
| <span id="6021">6021</span> |
| <span id="6022">6022</span> |
| <span id="6023">6023</span> |
| <span id="6024">6024</span> |
| <span id="6025">6025</span> |
| <span id="6026">6026</span> |
| <span id="6027">6027</span> |
| <span id="6028">6028</span> |
| <span id="6029">6029</span> |
| <span id="6030">6030</span> |
| <span id="6031">6031</span> |
| <span id="6032">6032</span> |
| <span id="6033">6033</span> |
| <span id="6034">6034</span> |
| <span id="6035">6035</span> |
| <span id="6036">6036</span> |
| <span id="6037">6037</span> |
| <span id="6038">6038</span> |
| <span id="6039">6039</span> |
| <span id="6040">6040</span> |
| <span id="6041">6041</span> |
| <span id="6042">6042</span> |
| <span id="6043">6043</span> |
| <span id="6044">6044</span> |
| <span id="6045">6045</span> |
| <span id="6046">6046</span> |
| <span id="6047">6047</span> |
| <span id="6048">6048</span> |
| <span id="6049">6049</span> |
| <span id="6050">6050</span> |
| <span id="6051">6051</span> |
| <span id="6052">6052</span> |
| <span id="6053">6053</span> |
| <span id="6054">6054</span> |
| <span id="6055">6055</span> |
| <span id="6056">6056</span> |
| <span id="6057">6057</span> |
| <span id="6058">6058</span> |
| <span id="6059">6059</span> |
| <span id="6060">6060</span> |
| <span id="6061">6061</span> |
| <span id="6062">6062</span> |
| <span id="6063">6063</span> |
| <span id="6064">6064</span> |
| <span id="6065">6065</span> |
| <span id="6066">6066</span> |
| <span id="6067">6067</span> |
| <span id="6068">6068</span> |
| <span id="6069">6069</span> |
| <span id="6070">6070</span> |
| <span id="6071">6071</span> |
| <span id="6072">6072</span> |
| <span id="6073">6073</span> |
| <span id="6074">6074</span> |
| <span id="6075">6075</span> |
| <span id="6076">6076</span> |
| <span id="6077">6077</span> |
| <span id="6078">6078</span> |
| <span id="6079">6079</span> |
| <span id="6080">6080</span> |
| <span id="6081">6081</span> |
| <span id="6082">6082</span> |
| <span id="6083">6083</span> |
| <span id="6084">6084</span> |
| <span id="6085">6085</span> |
| <span id="6086">6086</span> |
| <span id="6087">6087</span> |
| <span id="6088">6088</span> |
| <span id="6089">6089</span> |
| <span id="6090">6090</span> |
| <span id="6091">6091</span> |
| <span id="6092">6092</span> |
| <span id="6093">6093</span> |
| <span id="6094">6094</span> |
| <span id="6095">6095</span> |
| <span id="6096">6096</span> |
| <span id="6097">6097</span> |
| <span id="6098">6098</span> |
| <span id="6099">6099</span> |
| <span id="6100">6100</span> |
| <span id="6101">6101</span> |
| <span id="6102">6102</span> |
| <span id="6103">6103</span> |
| <span id="6104">6104</span> |
| <span id="6105">6105</span> |
| <span id="6106">6106</span> |
| <span id="6107">6107</span> |
| <span id="6108">6108</span> |
| <span id="6109">6109</span> |
| <span id="6110">6110</span> |
| <span id="6111">6111</span> |
| <span id="6112">6112</span> |
| <span id="6113">6113</span> |
| <span id="6114">6114</span> |
| <span id="6115">6115</span> |
| <span id="6116">6116</span> |
| <span id="6117">6117</span> |
| <span id="6118">6118</span> |
| <span id="6119">6119</span> |
| <span id="6120">6120</span> |
| <span id="6121">6121</span> |
| <span id="6122">6122</span> |
| <span id="6123">6123</span> |
| <span id="6124">6124</span> |
| <span id="6125">6125</span> |
| <span id="6126">6126</span> |
| <span id="6127">6127</span> |
| <span id="6128">6128</span> |
| <span id="6129">6129</span> |
| <span id="6130">6130</span> |
| </pre><pre class="rust"><code><span class="doccomment">/*! |
| This module provides a regular expression parser. |
| */ |
| |
| </span><span class="kw">use </span>core::{ |
| borrow::Borrow, |
| cell::{Cell, RefCell}, |
| mem, |
| }; |
| |
| <span class="kw">use </span>alloc::{ |
| boxed::Box, |
| string::{String, ToString}, |
| vec, |
| vec::Vec, |
| }; |
| |
| <span class="kw">use crate</span>::{ |
| ast::{<span class="self">self</span>, Ast, Position, Span}, |
| either::Either, |
| is_escapeable_character, is_meta_character, |
| }; |
| |
| <span class="kw">type </span><span class="prelude-ty">Result</span><T> = core::result::Result<T, ast::Error>; |
| |
| <span class="doccomment">/// A primitive is an expression with no sub-expressions. This includes |
| /// literals, assertions and non-set character classes. This representation |
| /// is used as intermediate state in the parser. |
| /// |
| /// This does not include ASCII character classes, since they can only appear |
| /// within a set character class. |
| </span><span class="attribute">#[derive(Clone, Debug, Eq, PartialEq)] |
| </span><span class="kw">enum </span>Primitive { |
| Literal(ast::Literal), |
| Assertion(ast::Assertion), |
| Dot(Span), |
| Perl(ast::ClassPerl), |
| Unicode(ast::ClassUnicode), |
| } |
| |
| <span class="kw">impl </span>Primitive { |
| <span class="doccomment">/// Return the span of this primitive. |
| </span><span class="kw">fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Span { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Primitive::Literal(<span class="kw-2">ref </span>x) => <span class="kw-2">&</span>x.span, |
| Primitive::Assertion(<span class="kw-2">ref </span>x) => <span class="kw-2">&</span>x.span, |
| Primitive::Dot(<span class="kw-2">ref </span>span) => span, |
| Primitive::Perl(<span class="kw-2">ref </span>x) => <span class="kw-2">&</span>x.span, |
| Primitive::Unicode(<span class="kw-2">ref </span>x) => <span class="kw-2">&</span>x.span, |
| } |
| } |
| |
| <span class="doccomment">/// Convert this primitive into a proper AST. |
| </span><span class="kw">fn </span>into_ast(<span class="self">self</span>) -> Ast { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Primitive::Literal(lit) => Ast::Literal(lit), |
| Primitive::Assertion(assert) => Ast::Assertion(assert), |
| Primitive::Dot(span) => Ast::Dot(span), |
| Primitive::Perl(cls) => Ast::Class(ast::Class::Perl(cls)), |
| Primitive::Unicode(cls) => Ast::Class(ast::Class::Unicode(cls)), |
| } |
| } |
| |
| <span class="doccomment">/// Convert this primitive into an item in a character class. |
| /// |
| /// If this primitive is not a legal item (i.e., an assertion or a dot), |
| /// then return an error. |
| </span><span class="kw">fn </span>into_class_set_item<P: Borrow<Parser>>( |
| <span class="self">self</span>, |
| p: <span class="kw-2">&</span>ParserI<<span class="lifetime">'_</span>, P>, |
| ) -> <span class="prelude-ty">Result</span><ast::ClassSetItem> { |
| <span class="kw">use </span><span class="self">self</span>::Primitive::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::ast::ClassSetItem; |
| |
| <span class="kw">match </span><span class="self">self </span>{ |
| Literal(lit) => <span class="prelude-val">Ok</span>(ClassSetItem::Literal(lit)), |
| Perl(cls) => <span class="prelude-val">Ok</span>(ClassSetItem::Perl(cls)), |
| Unicode(cls) => <span class="prelude-val">Ok</span>(ClassSetItem::Unicode(cls)), |
| x => <span class="prelude-val">Err</span>(p.error(<span class="kw-2">*</span>x.span(), ast::ErrorKind::ClassEscapeInvalid)), |
| } |
| } |
| |
| <span class="doccomment">/// Convert this primitive into a literal in a character class. In |
| /// particular, literals are the only valid items that can appear in |
| /// ranges. |
| /// |
| /// If this primitive is not a legal item (i.e., a class, assertion or a |
| /// dot), then return an error. |
| </span><span class="kw">fn </span>into_class_literal<P: Borrow<Parser>>( |
| <span class="self">self</span>, |
| p: <span class="kw-2">&</span>ParserI<<span class="lifetime">'_</span>, P>, |
| ) -> <span class="prelude-ty">Result</span><ast::Literal> { |
| <span class="kw">use </span><span class="self">self</span>::Primitive::<span class="kw-2">*</span>; |
| |
| <span class="kw">match </span><span class="self">self </span>{ |
| Literal(lit) => <span class="prelude-val">Ok</span>(lit), |
| x => <span class="prelude-val">Err</span>(p.error(<span class="kw-2">*</span>x.span(), ast::ErrorKind::ClassRangeLiteral)), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if the given character is a hexadecimal digit. |
| </span><span class="kw">fn </span>is_hex(c: char) -> bool { |
| (<span class="string">'0' </span><= c && c <= <span class="string">'9'</span>) || (<span class="string">'a' </span><= c && c <= <span class="string">'f'</span>) || (<span class="string">'A' </span><= c && c <= <span class="string">'F'</span>) |
| } |
| |
| <span class="doccomment">/// Returns true if the given character is a valid in a capture group name. |
| /// |
| /// If `first` is true, then `c` is treated as the first character in the |
| /// group name (which must be alphabetic or underscore). |
| </span><span class="kw">fn </span>is_capture_char(c: char, first: bool) -> bool { |
| <span class="kw">if </span>first { |
| c == <span class="string">'_' </span>|| c.is_alphabetic() |
| } <span class="kw">else </span>{ |
| c == <span class="string">'_' </span>|| c == <span class="string">'.' </span>|| c == <span class="string">'[' </span>|| c == <span class="string">']' </span>|| c.is_alphanumeric() |
| } |
| } |
| |
| <span class="doccomment">/// A builder for a regular expression parser. |
| /// |
| /// This builder permits modifying configuration options for the parser. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>ParserBuilder { |
| ignore_whitespace: bool, |
| nest_limit: u32, |
| octal: bool, |
| } |
| |
| <span class="kw">impl </span>Default <span class="kw">for </span>ParserBuilder { |
| <span class="kw">fn </span>default() -> ParserBuilder { |
| ParserBuilder::new() |
| } |
| } |
| |
| <span class="kw">impl </span>ParserBuilder { |
| <span class="doccomment">/// Create a new parser builder with a default configuration. |
| </span><span class="kw">pub fn </span>new() -> ParserBuilder { |
| ParserBuilder { |
| ignore_whitespace: <span class="bool-val">false</span>, |
| nest_limit: <span class="number">250</span>, |
| octal: <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Build a parser from this configuration with the given pattern. |
| </span><span class="kw">pub fn </span>build(<span class="kw-2">&</span><span class="self">self</span>) -> Parser { |
| Parser { |
| pos: Cell::new(Position { offset: <span class="number">0</span>, line: <span class="number">1</span>, column: <span class="number">1 </span>}), |
| capture_index: Cell::new(<span class="number">0</span>), |
| nest_limit: <span class="self">self</span>.nest_limit, |
| octal: <span class="self">self</span>.octal, |
| initial_ignore_whitespace: <span class="self">self</span>.ignore_whitespace, |
| ignore_whitespace: Cell::new(<span class="self">self</span>.ignore_whitespace), |
| comments: RefCell::new(<span class="macro">vec!</span>[]), |
| stack_group: RefCell::new(<span class="macro">vec!</span>[]), |
| stack_class: RefCell::new(<span class="macro">vec!</span>[]), |
| capture_names: RefCell::new(<span class="macro">vec!</span>[]), |
| scratch: RefCell::new(String::new()), |
| } |
| } |
| |
| <span class="doccomment">/// Set the nesting limit for this parser. |
| /// |
| /// The nesting limit controls how deep the abstract syntax tree is allowed |
| /// to be. If the AST exceeds the given limit (e.g., with too many nested |
| /// groups), then an error is returned by the parser. |
| /// |
| /// The purpose of this limit is to act as a heuristic to prevent stack |
| /// overflow for consumers that do structural induction on an `Ast` using |
| /// explicit recursion. While this crate never does this (instead using |
| /// constant stack space and moving the call stack to the heap), other |
| /// crates may. |
| /// |
| /// This limit is not checked until the entire AST is parsed. Therefore, |
| /// if callers want to put a limit on the amount of heap space used, then |
| /// they should impose a limit on the length, in bytes, of the concrete |
| /// pattern string. In particular, this is viable since this parser |
| /// implementation will limit itself to heap space proportional to the |
| /// length of the pattern string. |
| /// |
| /// Note that a nest limit of `0` will return a nest limit error for most |
| /// patterns but not all. For example, a nest limit of `0` permits `a` but |
| /// not `ab`, since `ab` requires a concatenation, which results in a nest |
| /// depth of `1`. In general, a nest limit is not something that manifests |
| /// in an obvious way in the concrete syntax, therefore, it should not be |
| /// used in a granular way. |
| </span><span class="kw">pub fn </span>nest_limit(<span class="kw-2">&mut </span><span class="self">self</span>, limit: u32) -> <span class="kw-2">&mut </span>ParserBuilder { |
| <span class="self">self</span>.nest_limit = limit; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Whether to support octal syntax or not. |
| /// |
| /// Octal syntax is a little-known way of uttering Unicode codepoints in |
| /// a regular expression. For example, `a`, `\x61`, `\u0061` and |
| /// `\141` are all equivalent regular expressions, where the last example |
| /// shows octal syntax. |
| /// |
| /// While supporting octal syntax isn't in and of itself a problem, it does |
| /// make good error messages harder. That is, in PCRE based regex engines, |
| /// syntax like `\0` invokes a backreference, which is explicitly |
| /// unsupported in Rust's regex engine. However, many users expect it to |
| /// be supported. Therefore, when octal support is disabled, the error |
| /// message will explicitly mention that backreferences aren't supported. |
| /// |
| /// Octal syntax is disabled by default. |
| </span><span class="kw">pub fn </span>octal(<span class="kw-2">&mut </span><span class="self">self</span>, yes: bool) -> <span class="kw-2">&mut </span>ParserBuilder { |
| <span class="self">self</span>.octal = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Enable verbose mode in the regular expression. |
| /// |
| /// When enabled, verbose mode permits insignificant whitespace in many |
| /// places in the regular expression, as well as comments. Comments are |
| /// started using `#` and continue until the end of the line. |
| /// |
| /// By default, this is disabled. It may be selectively enabled in the |
| /// regular expression by using the `x` flag regardless of this setting. |
| </span><span class="kw">pub fn </span>ignore_whitespace(<span class="kw-2">&mut </span><span class="self">self</span>, yes: bool) -> <span class="kw-2">&mut </span>ParserBuilder { |
| <span class="self">self</span>.ignore_whitespace = yes; |
| <span class="self">self |
| </span>} |
| } |
| |
| <span class="doccomment">/// A regular expression parser. |
| /// |
| /// This parses a string representation of a regular expression into an |
| /// abstract syntax tree. The size of the tree is proportional to the length |
| /// of the regular expression pattern. |
| /// |
| /// A `Parser` can be configured in more detail via a [`ParserBuilder`]. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>Parser { |
| <span class="doccomment">/// The current position of the parser. |
| </span>pos: Cell<Position>, |
| <span class="doccomment">/// The current capture index. |
| </span>capture_index: Cell<u32>, |
| <span class="doccomment">/// The maximum number of open parens/brackets allowed. If the parser |
| /// exceeds this number, then an error is returned. |
| </span>nest_limit: u32, |
| <span class="doccomment">/// Whether to support octal syntax or not. When `false`, the parser will |
| /// return an error helpfully pointing out that backreferences are not |
| /// supported. |
| </span>octal: bool, |
| <span class="doccomment">/// The initial setting for `ignore_whitespace` as provided by |
| /// `ParserBuilder`. It is used when resetting the parser's state. |
| </span>initial_ignore_whitespace: bool, |
| <span class="doccomment">/// Whether whitespace should be ignored. When enabled, comments are |
| /// also permitted. |
| </span>ignore_whitespace: Cell<bool>, |
| <span class="doccomment">/// A list of comments, in order of appearance. |
| </span>comments: RefCell<Vec<ast::Comment>>, |
| <span class="doccomment">/// A stack of grouped sub-expressions, including alternations. |
| </span>stack_group: RefCell<Vec<GroupState>>, |
| <span class="doccomment">/// A stack of nested character classes. This is only non-empty when |
| /// parsing a class. |
| </span>stack_class: RefCell<Vec<ClassState>>, |
| <span class="doccomment">/// A sorted sequence of capture names. This is used to detect duplicate |
| /// capture names and report an error if one is detected. |
| </span>capture_names: RefCell<Vec<ast::CaptureName>>, |
| <span class="doccomment">/// A scratch buffer used in various places. Mostly this is used to |
| /// accumulate relevant characters from parts of a pattern. |
| </span>scratch: RefCell<String>, |
| } |
| |
| <span class="doccomment">/// ParserI is the internal parser implementation. |
| /// |
| /// We use this separate type so that we can carry the provided pattern string |
| /// along with us. In particular, a `Parser` internal state is not tied to any |
| /// one pattern, but `ParserI` is. |
| /// |
| /// This type also lets us use `ParserI<&Parser>` in production code while |
| /// retaining the convenience of `ParserI<Parser>` for tests, which sometimes |
| /// work against the internal interface of the parser. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">struct </span>ParserI<<span class="lifetime">'s</span>, P> { |
| <span class="doccomment">/// The parser state/configuration. |
| </span>parser: P, |
| <span class="doccomment">/// The full regular expression provided by the user. |
| </span>pattern: <span class="kw-2">&</span><span class="lifetime">'s </span>str, |
| } |
| |
| <span class="doccomment">/// GroupState represents a single stack frame while parsing nested groups |
| /// and alternations. Each frame records the state up to an opening parenthesis |
| /// or a alternating bracket `|`. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">enum </span>GroupState { |
| <span class="doccomment">/// This state is pushed whenever an opening group is found. |
| </span>Group { |
| <span class="doccomment">/// The concatenation immediately preceding the opening group. |
| </span>concat: ast::Concat, |
| <span class="doccomment">/// The group that has been opened. Its sub-AST is always empty. |
| </span>group: ast::Group, |
| <span class="doccomment">/// Whether this group has the `x` flag enabled or not. |
| </span>ignore_whitespace: bool, |
| }, |
| <span class="doccomment">/// This state is pushed whenever a new alternation branch is found. If |
| /// an alternation branch is found and this state is at the top of the |
| /// stack, then this state should be modified to include the new |
| /// alternation. |
| </span>Alternation(ast::Alternation), |
| } |
| |
| <span class="doccomment">/// ClassState represents a single stack frame while parsing character classes. |
| /// Each frame records the state up to an intersection, difference, symmetric |
| /// difference or nested class. |
| /// |
| /// Note that a parser's character class stack is only non-empty when parsing |
| /// a character class. In all other cases, it is empty. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">enum </span>ClassState { |
| <span class="doccomment">/// This state is pushed whenever an opening bracket is found. |
| </span>Open { |
| <span class="doccomment">/// The union of class items immediately preceding this class. |
| </span><span class="kw">union</span>: ast::ClassSetUnion, |
| <span class="doccomment">/// The class that has been opened. Typically this just corresponds |
| /// to the `[`, but it can also include `[^` since `^` indicates |
| /// negation of the class. |
| </span>set: ast::ClassBracketed, |
| }, |
| <span class="doccomment">/// This state is pushed when a operator is seen. When popped, the stored |
| /// set becomes the left hand side of the operator. |
| </span>Op { |
| <span class="doccomment">/// The type of the operation, i.e., &&, -- or ~~. |
| </span>kind: ast::ClassSetBinaryOpKind, |
| <span class="doccomment">/// The left-hand side of the operator. |
| </span>lhs: ast::ClassSet, |
| }, |
| } |
| |
| <span class="kw">impl </span>Parser { |
| <span class="doccomment">/// Create a new parser with a default configuration. |
| /// |
| /// The parser can be run with either the `parse` or `parse_with_comments` |
| /// methods. The parse methods return an abstract syntax tree. |
| /// |
| /// To set configuration options on the parser, use [`ParserBuilder`]. |
| </span><span class="kw">pub fn </span>new() -> Parser { |
| ParserBuilder::new().build() |
| } |
| |
| <span class="doccomment">/// Parse the regular expression into an abstract syntax tree. |
| </span><span class="kw">pub fn </span>parse(<span class="kw-2">&mut </span><span class="self">self</span>, pattern: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><Ast> { |
| ParserI::new(<span class="self">self</span>, pattern).parse() |
| } |
| |
| <span class="doccomment">/// Parse the regular expression and return an abstract syntax tree with |
| /// all of the comments found in the pattern. |
| </span><span class="kw">pub fn </span>parse_with_comments( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| pattern: <span class="kw-2">&</span>str, |
| ) -> <span class="prelude-ty">Result</span><ast::WithComments> { |
| ParserI::new(<span class="self">self</span>, pattern).parse_with_comments() |
| } |
| |
| <span class="doccomment">/// Reset the internal state of a parser. |
| /// |
| /// This is called at the beginning of every parse. This prevents the |
| /// parser from running with inconsistent state (say, if a previous |
| /// invocation returned an error and the parser is reused). |
| </span><span class="kw">fn </span>reset(<span class="kw-2">&</span><span class="self">self</span>) { |
| <span class="comment">// These settings should be in line with the construction |
| // in `ParserBuilder::build`. |
| </span><span class="self">self</span>.pos.set(Position { offset: <span class="number">0</span>, line: <span class="number">1</span>, column: <span class="number">1 </span>}); |
| <span class="self">self</span>.ignore_whitespace.set(<span class="self">self</span>.initial_ignore_whitespace); |
| <span class="self">self</span>.comments.borrow_mut().clear(); |
| <span class="self">self</span>.stack_group.borrow_mut().clear(); |
| <span class="self">self</span>.stack_class.borrow_mut().clear(); |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, P: Borrow<Parser>> ParserI<<span class="lifetime">'s</span>, P> { |
| <span class="doccomment">/// Build an internal parser from a parser configuration and a pattern. |
| </span><span class="kw">fn </span>new(parser: P, pattern: <span class="kw-2">&</span><span class="lifetime">'s </span>str) -> ParserI<<span class="lifetime">'s</span>, P> { |
| ParserI { parser, pattern } |
| } |
| |
| <span class="doccomment">/// Return a reference to the parser state. |
| </span><span class="kw">fn </span>parser(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Parser { |
| <span class="self">self</span>.parser.borrow() |
| } |
| |
| <span class="doccomment">/// Return a reference to the pattern being parsed. |
| </span><span class="kw">fn </span>pattern(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="self">self</span>.pattern.borrow() |
| } |
| |
| <span class="doccomment">/// Create a new error with the given span and error type. |
| </span><span class="kw">fn </span>error(<span class="kw-2">&</span><span class="self">self</span>, span: Span, kind: ast::ErrorKind) -> ast::Error { |
| ast::Error { kind, pattern: <span class="self">self</span>.pattern().to_string(), span } |
| } |
| |
| <span class="doccomment">/// Return the current offset of the parser. |
| /// |
| /// The offset starts at `0` from the beginning of the regular expression |
| /// pattern string. |
| </span><span class="kw">fn </span>offset(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.parser().pos.get().offset |
| } |
| |
| <span class="doccomment">/// Return the current line number of the parser. |
| /// |
| /// The line number starts at `1`. |
| </span><span class="kw">fn </span>line(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.parser().pos.get().line |
| } |
| |
| <span class="doccomment">/// Return the current column of the parser. |
| /// |
| /// The column number starts at `1` and is reset whenever a `\n` is seen. |
| </span><span class="kw">fn </span>column(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.parser().pos.get().column |
| } |
| |
| <span class="doccomment">/// Return the next capturing index. Each subsequent call increments the |
| /// internal index. |
| /// |
| /// The span given should correspond to the location of the opening |
| /// parenthesis. |
| /// |
| /// If the capture limit is exceeded, then an error is returned. |
| </span><span class="kw">fn </span>next_capture_index(<span class="kw-2">&</span><span class="self">self</span>, span: Span) -> <span class="prelude-ty">Result</span><u32> { |
| <span class="kw">let </span>current = <span class="self">self</span>.parser().capture_index.get(); |
| <span class="kw">let </span>i = current.checked_add(<span class="number">1</span>).ok_or_else(|| { |
| <span class="self">self</span>.error(span, ast::ErrorKind::CaptureLimitExceeded) |
| })<span class="question-mark">?</span>; |
| <span class="self">self</span>.parser().capture_index.set(i); |
| <span class="prelude-val">Ok</span>(i) |
| } |
| |
| <span class="doccomment">/// Adds the given capture name to this parser. If this capture name has |
| /// already been used, then an error is returned. |
| </span><span class="kw">fn </span>add_capture_name(<span class="kw-2">&</span><span class="self">self</span>, cap: <span class="kw-2">&</span>ast::CaptureName) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span><span class="kw-2">mut </span>names = <span class="self">self</span>.parser().capture_names.borrow_mut(); |
| <span class="kw">match </span>names |
| .binary_search_by_key(<span class="kw-2">&</span>cap.name.as_str(), |c| c.name.as_str()) |
| { |
| <span class="prelude-val">Err</span>(i) => { |
| names.insert(i, cap.clone()); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="prelude-val">Ok</span>(i) => <span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| cap.span, |
| ast::ErrorKind::GroupNameDuplicate { original: names[i].span }, |
| )), |
| } |
| } |
| |
| <span class="doccomment">/// Return whether the parser should ignore whitespace or not. |
| </span><span class="kw">fn </span>ignore_whitespace(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.parser().ignore_whitespace.get() |
| } |
| |
| <span class="doccomment">/// Return the character at the current position of the parser. |
| /// |
| /// This panics if the current position does not point to a valid char. |
| </span><span class="kw">fn </span>char(<span class="kw-2">&</span><span class="self">self</span>) -> char { |
| <span class="self">self</span>.char_at(<span class="self">self</span>.offset()) |
| } |
| |
| <span class="doccomment">/// Return the character at the given position. |
| /// |
| /// This panics if the given position does not point to a valid char. |
| </span><span class="kw">fn </span>char_at(<span class="kw-2">&</span><span class="self">self</span>, i: usize) -> char { |
| <span class="self">self</span>.pattern()[i..] |
| .chars() |
| .next() |
| .unwrap_or_else(|| <span class="macro">panic!</span>(<span class="string">"expected char at offset {}"</span>, i)) |
| } |
| |
| <span class="doccomment">/// Bump the parser to the next Unicode scalar value. |
| /// |
| /// If the end of the input has been reached, then `false` is returned. |
| </span><span class="kw">fn </span>bump(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">if </span><span class="self">self</span>.is_eof() { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| <span class="kw">let </span>Position { <span class="kw-2">mut </span>offset, <span class="kw-2">mut </span>line, <span class="kw-2">mut </span>column } = <span class="self">self</span>.pos(); |
| <span class="kw">if </span><span class="self">self</span>.char() == <span class="string">'\n' </span>{ |
| line = line.checked_add(<span class="number">1</span>).unwrap(); |
| column = <span class="number">1</span>; |
| } <span class="kw">else </span>{ |
| column = column.checked_add(<span class="number">1</span>).unwrap(); |
| } |
| offset += <span class="self">self</span>.char().len_utf8(); |
| <span class="self">self</span>.parser().pos.set(Position { offset, line, column }); |
| <span class="self">self</span>.pattern()[<span class="self">self</span>.offset()..].chars().next().is_some() |
| } |
| |
| <span class="doccomment">/// If the substring starting at the current position of the parser has |
| /// the given prefix, then bump the parser to the character immediately |
| /// following the prefix and return true. Otherwise, don't bump the parser |
| /// and return false. |
| </span><span class="kw">fn </span>bump_if(<span class="kw-2">&</span><span class="self">self</span>, prefix: <span class="kw-2">&</span>str) -> bool { |
| <span class="kw">if </span><span class="self">self</span>.pattern()[<span class="self">self</span>.offset()..].starts_with(prefix) { |
| <span class="kw">for _ in </span><span class="number">0</span>..prefix.chars().count() { |
| <span class="self">self</span>.bump(); |
| } |
| <span class="bool-val">true |
| </span>} <span class="kw">else </span>{ |
| <span class="bool-val">false |
| </span>} |
| } |
| |
| <span class="doccomment">/// Returns true if and only if the parser is positioned at a look-around |
| /// prefix. The conditions under which this returns true must always |
| /// correspond to a regular expression that would otherwise be consider |
| /// invalid. |
| /// |
| /// This should only be called immediately after parsing the opening of |
| /// a group or a set of flags. |
| </span><span class="kw">fn </span>is_lookaround_prefix(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.bump_if(<span class="string">"?="</span>) |
| || <span class="self">self</span>.bump_if(<span class="string">"?!"</span>) |
| || <span class="self">self</span>.bump_if(<span class="string">"?<="</span>) |
| || <span class="self">self</span>.bump_if(<span class="string">"?<!"</span>) |
| } |
| |
| <span class="doccomment">/// Bump the parser, and if the `x` flag is enabled, bump through any |
| /// subsequent spaces. Return true if and only if the parser is not at |
| /// EOF. |
| </span><span class="kw">fn </span>bump_and_bump_space(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">if </span>!<span class="self">self</span>.bump() { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| <span class="self">self</span>.bump_space(); |
| !<span class="self">self</span>.is_eof() |
| } |
| |
| <span class="doccomment">/// If the `x` flag is enabled (i.e., whitespace insensitivity with |
| /// comments), then this will advance the parser through all whitespace |
| /// and comments to the next non-whitespace non-comment byte. |
| /// |
| /// If the `x` flag is disabled, then this is a no-op. |
| /// |
| /// This should be used selectively throughout the parser where |
| /// arbitrary whitespace is permitted when the `x` flag is enabled. For |
| /// example, `{ 5 , 6}` is equivalent to `{5,6}`. |
| </span><span class="kw">fn </span>bump_space(<span class="kw-2">&</span><span class="self">self</span>) { |
| <span class="kw">if </span>!<span class="self">self</span>.ignore_whitespace() { |
| <span class="kw">return</span>; |
| } |
| <span class="kw">while </span>!<span class="self">self</span>.is_eof() { |
| <span class="kw">if </span><span class="self">self</span>.char().is_whitespace() { |
| <span class="self">self</span>.bump(); |
| } <span class="kw">else if </span><span class="self">self</span>.char() == <span class="string">'#' </span>{ |
| <span class="kw">let </span>start = <span class="self">self</span>.pos(); |
| <span class="kw">let </span><span class="kw-2">mut </span>comment_text = String::new(); |
| <span class="self">self</span>.bump(); |
| <span class="kw">while </span>!<span class="self">self</span>.is_eof() { |
| <span class="kw">let </span>c = <span class="self">self</span>.char(); |
| <span class="self">self</span>.bump(); |
| <span class="kw">if </span>c == <span class="string">'\n' </span>{ |
| <span class="kw">break</span>; |
| } |
| comment_text.push(c); |
| } |
| <span class="kw">let </span>comment = ast::Comment { |
| span: Span::new(start, <span class="self">self</span>.pos()), |
| comment: comment_text, |
| }; |
| <span class="self">self</span>.parser().comments.borrow_mut().push(comment); |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Peek at the next character in the input without advancing the parser. |
| /// |
| /// If the input has been exhausted, then this returns `None`. |
| </span><span class="kw">fn </span>peek(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><char> { |
| <span class="kw">if </span><span class="self">self</span>.is_eof() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="self">self</span>.pattern()[<span class="self">self</span>.offset() + <span class="self">self</span>.char().len_utf8()..].chars().next() |
| } |
| |
| <span class="doccomment">/// Like peek, but will ignore spaces when the parser is in whitespace |
| /// insensitive mode. |
| </span><span class="kw">fn </span>peek_space(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><char> { |
| <span class="kw">if </span>!<span class="self">self</span>.ignore_whitespace() { |
| <span class="kw">return </span><span class="self">self</span>.peek(); |
| } |
| <span class="kw">if </span><span class="self">self</span>.is_eof() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>start = <span class="self">self</span>.offset() + <span class="self">self</span>.char().len_utf8(); |
| <span class="kw">let </span><span class="kw-2">mut </span>in_comment = <span class="bool-val">false</span>; |
| <span class="kw">for </span>(i, c) <span class="kw">in </span><span class="self">self</span>.pattern()[start..].char_indices() { |
| <span class="kw">if </span>c.is_whitespace() { |
| <span class="kw">continue</span>; |
| } <span class="kw">else if </span>!in_comment && c == <span class="string">'#' </span>{ |
| in_comment = <span class="bool-val">true</span>; |
| } <span class="kw">else if </span>in_comment && c == <span class="string">'\n' </span>{ |
| in_comment = <span class="bool-val">false</span>; |
| } <span class="kw">else </span>{ |
| start += i; |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="self">self</span>.pattern()[start..].chars().next() |
| } |
| |
| <span class="doccomment">/// Returns true if the next call to `bump` would return false. |
| </span><span class="kw">fn </span>is_eof(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.offset() == <span class="self">self</span>.pattern().len() |
| } |
| |
| <span class="doccomment">/// Return the current position of the parser, which includes the offset, |
| /// line and column. |
| </span><span class="kw">fn </span>pos(<span class="kw-2">&</span><span class="self">self</span>) -> Position { |
| <span class="self">self</span>.parser().pos.get() |
| } |
| |
| <span class="doccomment">/// Create a span at the current position of the parser. Both the start |
| /// and end of the span are set. |
| </span><span class="kw">fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| Span::splat(<span class="self">self</span>.pos()) |
| } |
| |
| <span class="doccomment">/// Create a span that covers the current character. |
| </span><span class="kw">fn </span>span_char(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="kw">let </span><span class="kw-2">mut </span>next = Position { |
| offset: <span class="self">self</span>.offset().checked_add(<span class="self">self</span>.char().len_utf8()).unwrap(), |
| line: <span class="self">self</span>.line(), |
| column: <span class="self">self</span>.column().checked_add(<span class="number">1</span>).unwrap(), |
| }; |
| <span class="kw">if </span><span class="self">self</span>.char() == <span class="string">'\n' </span>{ |
| next.line += <span class="number">1</span>; |
| next.column = <span class="number">1</span>; |
| } |
| Span::new(<span class="self">self</span>.pos(), next) |
| } |
| |
| <span class="doccomment">/// Parse and push a single alternation on to the parser's internal stack. |
| /// If the top of the stack already has an alternation, then add to that |
| /// instead of pushing a new one. |
| /// |
| /// The concatenation given corresponds to a single alternation branch. |
| /// The concatenation returned starts the next branch and is empty. |
| /// |
| /// This assumes the parser is currently positioned at `|` and will advance |
| /// the parser to the character following `|`. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>push_alternate(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut </span>concat: ast::Concat) -> <span class="prelude-ty">Result</span><ast::Concat> { |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">'|'</span>); |
| concat.span.end = <span class="self">self</span>.pos(); |
| <span class="self">self</span>.push_or_add_alternation(concat); |
| <span class="self">self</span>.bump(); |
| <span class="prelude-val">Ok</span>(ast::Concat { span: <span class="self">self</span>.span(), asts: <span class="macro">vec!</span>[] }) |
| } |
| |
| <span class="doccomment">/// Pushes or adds the given branch of an alternation to the parser's |
| /// internal stack of state. |
| </span><span class="kw">fn </span>push_or_add_alternation(<span class="kw-2">&</span><span class="self">self</span>, concat: ast::Concat) { |
| <span class="kw">use </span><span class="self">self</span>::GroupState::<span class="kw-2">*</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>stack = <span class="self">self</span>.parser().stack_group.borrow_mut(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">&mut </span>Alternation(<span class="kw-2">ref mut </span>alts)) = stack.last_mut() { |
| alts.asts.push(concat.into_ast()); |
| <span class="kw">return</span>; |
| } |
| stack.push(Alternation(ast::Alternation { |
| span: Span::new(concat.span.start, <span class="self">self</span>.pos()), |
| asts: <span class="macro">vec!</span>[concat.into_ast()], |
| })); |
| } |
| |
| <span class="doccomment">/// Parse and push a group AST (and its parent concatenation) on to the |
| /// parser's internal stack. Return a fresh concatenation corresponding |
| /// to the group's sub-AST. |
| /// |
| /// If a set of flags was found (with no group), then the concatenation |
| /// is returned with that set of flags added. |
| /// |
| /// This assumes that the parser is currently positioned on the opening |
| /// parenthesis. It advances the parser to the character at the start |
| /// of the sub-expression (or adjoining expression). |
| /// |
| /// If there was a problem parsing the start of the group, then an error |
| /// is returned. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>push_group(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut </span>concat: ast::Concat) -> <span class="prelude-ty">Result</span><ast::Concat> { |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">'('</span>); |
| <span class="kw">match </span><span class="self">self</span>.parse_group()<span class="question-mark">? </span>{ |
| Either::Left(set) => { |
| <span class="kw">let </span>ignore = set.flags.flag_state(ast::Flag::IgnoreWhitespace); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = ignore { |
| <span class="self">self</span>.parser().ignore_whitespace.set(v); |
| } |
| |
| concat.asts.push(Ast::Flags(set)); |
| <span class="prelude-val">Ok</span>(concat) |
| } |
| Either::Right(group) => { |
| <span class="kw">let </span>old_ignore_whitespace = <span class="self">self</span>.ignore_whitespace(); |
| <span class="kw">let </span>new_ignore_whitespace = group |
| .flags() |
| .and_then(|f| f.flag_state(ast::Flag::IgnoreWhitespace)) |
| .unwrap_or(old_ignore_whitespace); |
| <span class="self">self</span>.parser().stack_group.borrow_mut().push( |
| GroupState::Group { |
| concat, |
| group, |
| ignore_whitespace: old_ignore_whitespace, |
| }, |
| ); |
| <span class="self">self</span>.parser().ignore_whitespace.set(new_ignore_whitespace); |
| <span class="prelude-val">Ok</span>(ast::Concat { span: <span class="self">self</span>.span(), asts: <span class="macro">vec!</span>[] }) |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Pop a group AST from the parser's internal stack and set the group's |
| /// AST to the given concatenation. Return the concatenation containing |
| /// the group. |
| /// |
| /// This assumes that the parser is currently positioned on the closing |
| /// parenthesis and advances the parser to the character following the `)`. |
| /// |
| /// If no such group could be popped, then an unopened group error is |
| /// returned. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>pop_group(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut </span>group_concat: ast::Concat) -> <span class="prelude-ty">Result</span><ast::Concat> { |
| <span class="kw">use </span><span class="self">self</span>::GroupState::<span class="kw-2">*</span>; |
| |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">')'</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>stack = <span class="self">self</span>.parser().stack_group.borrow_mut(); |
| <span class="kw">let </span>(<span class="kw-2">mut </span>prior_concat, <span class="kw-2">mut </span>group, ignore_whitespace, alt) = <span class="kw">match </span>stack |
| .pop() |
| { |
| <span class="prelude-val">Some</span>(Group { concat, group, ignore_whitespace }) => { |
| (concat, group, ignore_whitespace, <span class="prelude-val">None</span>) |
| } |
| <span class="prelude-val">Some</span>(Alternation(alt)) => <span class="kw">match </span>stack.pop() { |
| <span class="prelude-val">Some</span>(Group { concat, group, ignore_whitespace }) => { |
| (concat, group, ignore_whitespace, <span class="prelude-val">Some</span>(alt)) |
| } |
| <span class="prelude-val">None </span>| <span class="prelude-val">Some</span>(Alternation(<span class="kw">_</span>)) => { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| <span class="self">self</span>.span_char(), |
| ast::ErrorKind::GroupUnopened, |
| )); |
| } |
| }, |
| <span class="prelude-val">None </span>=> { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self |
| </span>.error(<span class="self">self</span>.span_char(), ast::ErrorKind::GroupUnopened)); |
| } |
| }; |
| <span class="self">self</span>.parser().ignore_whitespace.set(ignore_whitespace); |
| group_concat.span.end = <span class="self">self</span>.pos(); |
| <span class="self">self</span>.bump(); |
| group.span.end = <span class="self">self</span>.pos(); |
| <span class="kw">match </span>alt { |
| <span class="prelude-val">Some</span>(<span class="kw-2">mut </span>alt) => { |
| alt.span.end = group_concat.span.end; |
| alt.asts.push(group_concat.into_ast()); |
| group.ast = Box::new(alt.into_ast()); |
| } |
| <span class="prelude-val">None </span>=> { |
| group.ast = Box::new(group_concat.into_ast()); |
| } |
| } |
| prior_concat.asts.push(Ast::Group(group)); |
| <span class="prelude-val">Ok</span>(prior_concat) |
| } |
| |
| <span class="doccomment">/// Pop the last state from the parser's internal stack, if it exists, and |
| /// add the given concatenation to it. There either must be no state or a |
| /// single alternation item on the stack. Any other scenario produces an |
| /// error. |
| /// |
| /// This assumes that the parser has advanced to the end. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>pop_group_end(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut </span>concat: ast::Concat) -> <span class="prelude-ty">Result</span><Ast> { |
| concat.span.end = <span class="self">self</span>.pos(); |
| <span class="kw">let </span><span class="kw-2">mut </span>stack = <span class="self">self</span>.parser().stack_group.borrow_mut(); |
| <span class="kw">let </span>ast = <span class="kw">match </span>stack.pop() { |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Ok</span>(concat.into_ast()), |
| <span class="prelude-val">Some</span>(GroupState::Alternation(<span class="kw-2">mut </span>alt)) => { |
| alt.span.end = <span class="self">self</span>.pos(); |
| alt.asts.push(concat.into_ast()); |
| <span class="prelude-val">Ok</span>(Ast::Alternation(alt)) |
| } |
| <span class="prelude-val">Some</span>(GroupState::Group { group, .. }) => { |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| <span class="self">self</span>.error(group.span, ast::ErrorKind::GroupUnclosed) |
| ); |
| } |
| }; |
| <span class="comment">// If we try to pop again, there should be nothing. |
| </span><span class="kw">match </span>stack.pop() { |
| <span class="prelude-val">None </span>=> ast, |
| <span class="prelude-val">Some</span>(GroupState::Alternation(<span class="kw">_</span>)) => { |
| <span class="comment">// This unreachable is unfortunate. This case can't happen |
| // because the only way we can be here is if there were two |
| // `GroupState::Alternation`s adjacent in the parser's stack, |
| // which we guarantee to never happen because we never push a |
| // `GroupState::Alternation` if one is already at the top of |
| // the stack. |
| </span><span class="macro">unreachable!</span>() |
| } |
| <span class="prelude-val">Some</span>(GroupState::Group { group, .. }) => { |
| <span class="prelude-val">Err</span>(<span class="self">self</span>.error(group.span, ast::ErrorKind::GroupUnclosed)) |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Parse the opening of a character class and push the current class |
| /// parsing context onto the parser's stack. This assumes that the parser |
| /// is positioned at an opening `[`. The given union should correspond to |
| /// the union of set items built up before seeing the `[`. |
| /// |
| /// If there was a problem parsing the opening of the class, then an error |
| /// is returned. Otherwise, a new union of set items for the class is |
| /// returned (which may be populated with either a `]` or a `-`). |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>push_class_open( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| parent_union: ast::ClassSetUnion, |
| ) -> <span class="prelude-ty">Result</span><ast::ClassSetUnion> { |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">'['</span>); |
| |
| <span class="kw">let </span>(nested_set, nested_union) = <span class="self">self</span>.parse_set_class_open()<span class="question-mark">?</span>; |
| <span class="self">self</span>.parser() |
| .stack_class |
| .borrow_mut() |
| .push(ClassState::Open { <span class="kw">union</span>: parent_union, set: nested_set }); |
| <span class="prelude-val">Ok</span>(nested_union) |
| } |
| |
| <span class="doccomment">/// Parse the end of a character class set and pop the character class |
| /// parser stack. The union given corresponds to the last union built |
| /// before seeing the closing `]`. The union returned corresponds to the |
| /// parent character class set with the nested class added to it. |
| /// |
| /// This assumes that the parser is positioned at a `]` and will advance |
| /// the parser to the byte immediately following the `]`. |
| /// |
| /// If the stack is empty after popping, then this returns the final |
| /// "top-level" character class AST (where a "top-level" character class |
| /// is one that is not nested inside any other character class). |
| /// |
| /// If there is no corresponding opening bracket on the parser's stack, |
| /// then an error is returned. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>pop_class( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| nested_union: ast::ClassSetUnion, |
| ) -> <span class="prelude-ty">Result</span><Either<ast::ClassSetUnion, ast::Class>> { |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">']'</span>); |
| |
| <span class="kw">let </span>item = ast::ClassSet::Item(nested_union.into_item()); |
| <span class="kw">let </span>prevset = <span class="self">self</span>.pop_class_op(item); |
| <span class="kw">let </span><span class="kw-2">mut </span>stack = <span class="self">self</span>.parser().stack_class.borrow_mut(); |
| <span class="kw">match </span>stack.pop() { |
| <span class="prelude-val">None </span>=> { |
| <span class="comment">// We can never observe an empty stack: |
| // |
| // 1) We are guaranteed to start with a non-empty stack since |
| // the character class parser is only initiated when it sees |
| // a `[`. |
| // 2) If we ever observe an empty stack while popping after |
| // seeing a `]`, then we signal the character class parser |
| // to terminate. |
| </span><span class="macro">panic!</span>(<span class="string">"unexpected empty character class stack"</span>) |
| } |
| <span class="prelude-val">Some</span>(ClassState::Op { .. }) => { |
| <span class="comment">// This panic is unfortunate, but this case is impossible |
| // since we already popped the Op state if one exists above. |
| // Namely, every push to the class parser stack is guarded by |
| // whether an existing Op is already on the top of the stack. |
| // If it is, the existing Op is modified. That is, the stack |
| // can never have consecutive Op states. |
| </span><span class="macro">panic!</span>(<span class="string">"unexpected ClassState::Op"</span>) |
| } |
| <span class="prelude-val">Some</span>(ClassState::Open { <span class="kw-2">mut </span>union, <span class="kw-2">mut </span>set }) => { |
| <span class="self">self</span>.bump(); |
| set.span.end = <span class="self">self</span>.pos(); |
| set.kind = prevset; |
| <span class="kw">if </span>stack.is_empty() { |
| <span class="prelude-val">Ok</span>(Either::Right(ast::Class::Bracketed(set))) |
| } <span class="kw">else </span>{ |
| union.push(ast::ClassSetItem::Bracketed(Box::new(set))); |
| <span class="prelude-val">Ok</span>(Either::Left(union)) |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Return an "unclosed class" error whose span points to the most |
| /// recently opened class. |
| /// |
| /// This should only be called while parsing a character class. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>unclosed_class_error(<span class="kw-2">&</span><span class="self">self</span>) -> ast::Error { |
| <span class="kw">for </span>state <span class="kw">in </span><span class="self">self</span>.parser().stack_class.borrow().iter().rev() { |
| <span class="kw">if let </span>ClassState::Open { <span class="kw-2">ref </span>set, .. } = <span class="kw-2">*</span>state { |
| <span class="kw">return </span><span class="self">self</span>.error(set.span, ast::ErrorKind::ClassUnclosed); |
| } |
| } |
| <span class="comment">// We are guaranteed to have a non-empty stack with at least |
| // one open bracket, so we should never get here. |
| </span><span class="macro">panic!</span>(<span class="string">"no open character class found"</span>) |
| } |
| |
| <span class="doccomment">/// Push the current set of class items on to the class parser's stack as |
| /// the left hand side of the given operator. |
| /// |
| /// A fresh set union is returned, which should be used to build the right |
| /// hand side of this operator. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>push_class_op( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| next_kind: ast::ClassSetBinaryOpKind, |
| next_union: ast::ClassSetUnion, |
| ) -> ast::ClassSetUnion { |
| <span class="kw">let </span>item = ast::ClassSet::Item(next_union.into_item()); |
| <span class="kw">let </span>new_lhs = <span class="self">self</span>.pop_class_op(item); |
| <span class="self">self</span>.parser() |
| .stack_class |
| .borrow_mut() |
| .push(ClassState::Op { kind: next_kind, lhs: new_lhs }); |
| ast::ClassSetUnion { span: <span class="self">self</span>.span(), items: <span class="macro">vec!</span>[] } |
| } |
| |
| <span class="doccomment">/// Pop a character class set from the character class parser stack. If the |
| /// top of the stack is just an item (not an operation), then return the |
| /// given set unchanged. If the top of the stack is an operation, then the |
| /// given set will be used as the rhs of the operation on the top of the |
| /// stack. In that case, the binary operation is returned as a set. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>pop_class_op(<span class="kw-2">&</span><span class="self">self</span>, rhs: ast::ClassSet) -> ast::ClassSet { |
| <span class="kw">let </span><span class="kw-2">mut </span>stack = <span class="self">self</span>.parser().stack_class.borrow_mut(); |
| <span class="kw">let </span>(kind, lhs) = <span class="kw">match </span>stack.pop() { |
| <span class="prelude-val">Some</span>(ClassState::Op { kind, lhs }) => (kind, lhs), |
| <span class="prelude-val">Some</span>(state @ ClassState::Open { .. }) => { |
| stack.push(state); |
| <span class="kw">return </span>rhs; |
| } |
| <span class="prelude-val">None </span>=> <span class="macro">unreachable!</span>(), |
| }; |
| <span class="kw">let </span>span = Span::new(lhs.span().start, rhs.span().end); |
| ast::ClassSet::BinaryOp(ast::ClassSetBinaryOp { |
| span, |
| kind, |
| lhs: Box::new(lhs), |
| rhs: Box::new(rhs), |
| }) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, P: Borrow<Parser>> ParserI<<span class="lifetime">'s</span>, P> { |
| <span class="doccomment">/// Parse the regular expression into an abstract syntax tree. |
| </span><span class="kw">fn </span>parse(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><Ast> { |
| <span class="self">self</span>.parse_with_comments().map(|astc| astc.ast) |
| } |
| |
| <span class="doccomment">/// Parse the regular expression and return an abstract syntax tree with |
| /// all of the comments found in the pattern. |
| </span><span class="kw">fn </span>parse_with_comments(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><ast::WithComments> { |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.offset(), <span class="number">0</span>, <span class="string">"parser can only be used once"</span>); |
| <span class="self">self</span>.parser().reset(); |
| <span class="kw">let </span><span class="kw-2">mut </span>concat = ast::Concat { span: <span class="self">self</span>.span(), asts: <span class="macro">vec!</span>[] }; |
| <span class="kw">loop </span>{ |
| <span class="self">self</span>.bump_space(); |
| <span class="kw">if </span><span class="self">self</span>.is_eof() { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">match </span><span class="self">self</span>.char() { |
| <span class="string">'(' </span>=> concat = <span class="self">self</span>.push_group(concat)<span class="question-mark">?</span>, |
| <span class="string">')' </span>=> concat = <span class="self">self</span>.pop_group(concat)<span class="question-mark">?</span>, |
| <span class="string">'|' </span>=> concat = <span class="self">self</span>.push_alternate(concat)<span class="question-mark">?</span>, |
| <span class="string">'[' </span>=> { |
| <span class="kw">let </span>class = <span class="self">self</span>.parse_set_class()<span class="question-mark">?</span>; |
| concat.asts.push(Ast::Class(class)); |
| } |
| <span class="string">'?' </span>=> { |
| concat = <span class="self">self</span>.parse_uncounted_repetition( |
| concat, |
| ast::RepetitionKind::ZeroOrOne, |
| )<span class="question-mark">?</span>; |
| } |
| <span class="string">'*' </span>=> { |
| concat = <span class="self">self</span>.parse_uncounted_repetition( |
| concat, |
| ast::RepetitionKind::ZeroOrMore, |
| )<span class="question-mark">?</span>; |
| } |
| <span class="string">'+' </span>=> { |
| concat = <span class="self">self</span>.parse_uncounted_repetition( |
| concat, |
| ast::RepetitionKind::OneOrMore, |
| )<span class="question-mark">?</span>; |
| } |
| <span class="string">'{' </span>=> { |
| concat = <span class="self">self</span>.parse_counted_repetition(concat)<span class="question-mark">?</span>; |
| } |
| <span class="kw">_ </span>=> concat.asts.push(<span class="self">self</span>.parse_primitive()<span class="question-mark">?</span>.into_ast()), |
| } |
| } |
| <span class="kw">let </span>ast = <span class="self">self</span>.pop_group_end(concat)<span class="question-mark">?</span>; |
| NestLimiter::new(<span class="self">self</span>).check(<span class="kw-2">&</span>ast)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(ast::WithComments { |
| ast, |
| comments: mem::replace( |
| <span class="kw-2">&mut *</span><span class="self">self</span>.parser().comments.borrow_mut(), |
| <span class="macro">vec!</span>[], |
| ), |
| }) |
| } |
| |
| <span class="doccomment">/// Parses an uncounted repetition operation. An uncounted repetition |
| /// operator includes ?, * and +, but does not include the {m,n} syntax. |
| /// The given `kind` should correspond to the operator observed by the |
| /// caller. |
| /// |
| /// This assumes that the parser is currently positioned at the repetition |
| /// operator and advances the parser to the first character after the |
| /// operator. (Note that the operator may include a single additional `?`, |
| /// which makes the operator ungreedy.) |
| /// |
| /// The caller should include the concatenation that is being built. The |
| /// concatenation returned includes the repetition operator applied to the |
| /// last expression in the given concatenation. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_uncounted_repetition( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| <span class="kw-2">mut </span>concat: ast::Concat, |
| kind: ast::RepetitionKind, |
| ) -> <span class="prelude-ty">Result</span><ast::Concat> { |
| <span class="macro">assert!</span>( |
| <span class="self">self</span>.char() == <span class="string">'?' </span>|| <span class="self">self</span>.char() == <span class="string">'*' </span>|| <span class="self">self</span>.char() == <span class="string">'+' |
| </span>); |
| <span class="kw">let </span>op_start = <span class="self">self</span>.pos(); |
| <span class="kw">let </span>ast = <span class="kw">match </span>concat.asts.pop() { |
| <span class="prelude-val">Some</span>(ast) => ast, |
| <span class="prelude-val">None </span>=> { |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| <span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::RepetitionMissing) |
| ) |
| } |
| }; |
| <span class="kw">match </span>ast { |
| Ast::Empty(<span class="kw">_</span>) | Ast::Flags(<span class="kw">_</span>) => { |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| <span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::RepetitionMissing) |
| ) |
| } |
| <span class="kw">_ </span>=> {} |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>greedy = <span class="bool-val">true</span>; |
| <span class="kw">if </span><span class="self">self</span>.bump() && <span class="self">self</span>.char() == <span class="string">'?' </span>{ |
| greedy = <span class="bool-val">false</span>; |
| <span class="self">self</span>.bump(); |
| } |
| concat.asts.push(Ast::Repetition(ast::Repetition { |
| span: ast.span().with_end(<span class="self">self</span>.pos()), |
| op: ast::RepetitionOp { |
| span: Span::new(op_start, <span class="self">self</span>.pos()), |
| kind, |
| }, |
| greedy, |
| ast: Box::new(ast), |
| })); |
| <span class="prelude-val">Ok</span>(concat) |
| } |
| |
| <span class="doccomment">/// Parses a counted repetition operation. A counted repetition operator |
| /// corresponds to the {m,n} syntax, and does not include the ?, * or + |
| /// operators. |
| /// |
| /// This assumes that the parser is currently positioned at the opening `{` |
| /// and advances the parser to the first character after the operator. |
| /// (Note that the operator may include a single additional `?`, which |
| /// makes the operator ungreedy.) |
| /// |
| /// The caller should include the concatenation that is being built. The |
| /// concatenation returned includes the repetition operator applied to the |
| /// last expression in the given concatenation. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_counted_repetition( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| <span class="kw-2">mut </span>concat: ast::Concat, |
| ) -> <span class="prelude-ty">Result</span><ast::Concat> { |
| <span class="macro">assert!</span>(<span class="self">self</span>.char() == <span class="string">'{'</span>); |
| <span class="kw">let </span>start = <span class="self">self</span>.pos(); |
| <span class="kw">let </span>ast = <span class="kw">match </span>concat.asts.pop() { |
| <span class="prelude-val">Some</span>(ast) => ast, |
| <span class="prelude-val">None </span>=> { |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| <span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::RepetitionMissing) |
| ) |
| } |
| }; |
| <span class="kw">match </span>ast { |
| Ast::Empty(<span class="kw">_</span>) | Ast::Flags(<span class="kw">_</span>) => { |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| <span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::RepetitionMissing) |
| ) |
| } |
| <span class="kw">_ </span>=> {} |
| } |
| <span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, <span class="self">self</span>.pos()), |
| ast::ErrorKind::RepetitionCountUnclosed, |
| )); |
| } |
| <span class="kw">let </span>count_start = specialize_err( |
| <span class="self">self</span>.parse_decimal(), |
| ast::ErrorKind::DecimalEmpty, |
| ast::ErrorKind::RepetitionCountDecimalEmpty, |
| )<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>range = ast::RepetitionRange::Exactly(count_start); |
| <span class="kw">if </span><span class="self">self</span>.is_eof() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, <span class="self">self</span>.pos()), |
| ast::ErrorKind::RepetitionCountUnclosed, |
| )); |
| } |
| <span class="kw">if </span><span class="self">self</span>.char() == <span class="string">',' </span>{ |
| <span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, <span class="self">self</span>.pos()), |
| ast::ErrorKind::RepetitionCountUnclosed, |
| )); |
| } |
| <span class="kw">if </span><span class="self">self</span>.char() != <span class="string">'}' </span>{ |
| <span class="kw">let </span>count_end = specialize_err( |
| <span class="self">self</span>.parse_decimal(), |
| ast::ErrorKind::DecimalEmpty, |
| ast::ErrorKind::RepetitionCountDecimalEmpty, |
| )<span class="question-mark">?</span>; |
| range = ast::RepetitionRange::Bounded(count_start, count_end); |
| } <span class="kw">else </span>{ |
| range = ast::RepetitionRange::AtLeast(count_start); |
| } |
| } |
| <span class="kw">if </span><span class="self">self</span>.is_eof() || <span class="self">self</span>.char() != <span class="string">'}' </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, <span class="self">self</span>.pos()), |
| ast::ErrorKind::RepetitionCountUnclosed, |
| )); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>greedy = <span class="bool-val">true</span>; |
| <span class="kw">if </span><span class="self">self</span>.bump_and_bump_space() && <span class="self">self</span>.char() == <span class="string">'?' </span>{ |
| greedy = <span class="bool-val">false</span>; |
| <span class="self">self</span>.bump(); |
| } |
| |
| <span class="kw">let </span>op_span = Span::new(start, <span class="self">self</span>.pos()); |
| <span class="kw">if </span>!range.is_valid() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| <span class="self">self</span>.error(op_span, ast::ErrorKind::RepetitionCountInvalid) |
| ); |
| } |
| concat.asts.push(Ast::Repetition(ast::Repetition { |
| span: ast.span().with_end(<span class="self">self</span>.pos()), |
| op: ast::RepetitionOp { |
| span: op_span, |
| kind: ast::RepetitionKind::Range(range), |
| }, |
| greedy, |
| ast: Box::new(ast), |
| })); |
| <span class="prelude-val">Ok</span>(concat) |
| } |
| |
| <span class="doccomment">/// Parse a group (which contains a sub-expression) or a set of flags. |
| /// |
| /// If a group was found, then it is returned with an empty AST. If a set |
| /// of flags is found, then that set is returned. |
| /// |
| /// The parser should be positioned at the opening parenthesis. |
| /// |
| /// This advances the parser to the character before the start of the |
| /// sub-expression (in the case of a group) or to the closing parenthesis |
| /// immediately following the set of flags. |
| /// |
| /// # Errors |
| /// |
| /// If flags are given and incorrectly specified, then a corresponding |
| /// error is returned. |
| /// |
| /// If a capture name is given and it is incorrectly specified, then a |
| /// corresponding error is returned. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_group(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><Either<ast::SetFlags, ast::Group>> { |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">'('</span>); |
| <span class="kw">let </span>open_span = <span class="self">self</span>.span_char(); |
| <span class="self">self</span>.bump(); |
| <span class="self">self</span>.bump_space(); |
| <span class="kw">if </span><span class="self">self</span>.is_lookaround_prefix() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(open_span.start, <span class="self">self</span>.span().end), |
| ast::ErrorKind::UnsupportedLookAround, |
| )); |
| } |
| <span class="kw">let </span>inner_span = <span class="self">self</span>.span(); |
| <span class="kw">let </span><span class="kw-2">mut </span>starts_with_p = <span class="bool-val">true</span>; |
| <span class="kw">if </span><span class="self">self</span>.bump_if(<span class="string">"?P<"</span>) || { |
| starts_with_p = <span class="bool-val">false</span>; |
| <span class="self">self</span>.bump_if(<span class="string">"?<"</span>) |
| } { |
| <span class="kw">let </span>capture_index = <span class="self">self</span>.next_capture_index(open_span)<span class="question-mark">?</span>; |
| <span class="kw">let </span>name = <span class="self">self</span>.parse_capture_name(capture_index)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(Either::Right(ast::Group { |
| span: open_span, |
| kind: ast::GroupKind::CaptureName { starts_with_p, name }, |
| ast: Box::new(Ast::Empty(<span class="self">self</span>.span())), |
| })) |
| } <span class="kw">else if </span><span class="self">self</span>.bump_if(<span class="string">"?"</span>) { |
| <span class="kw">if </span><span class="self">self</span>.is_eof() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| <span class="self">self</span>.error(open_span, ast::ErrorKind::GroupUnclosed) |
| ); |
| } |
| <span class="kw">let </span>flags = <span class="self">self</span>.parse_flags()<span class="question-mark">?</span>; |
| <span class="kw">let </span>char_end = <span class="self">self</span>.char(); |
| <span class="self">self</span>.bump(); |
| <span class="kw">if </span>char_end == <span class="string">')' </span>{ |
| <span class="comment">// We don't allow empty flags, e.g., `(?)`. We instead |
| // interpret it as a repetition operator missing its argument. |
| </span><span class="kw">if </span>flags.items.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| inner_span, |
| ast::ErrorKind::RepetitionMissing, |
| )); |
| } |
| <span class="prelude-val">Ok</span>(Either::Left(ast::SetFlags { |
| span: Span { end: <span class="self">self</span>.pos(), ..open_span }, |
| flags, |
| })) |
| } <span class="kw">else </span>{ |
| <span class="macro">assert_eq!</span>(char_end, <span class="string">':'</span>); |
| <span class="prelude-val">Ok</span>(Either::Right(ast::Group { |
| span: open_span, |
| kind: ast::GroupKind::NonCapturing(flags), |
| ast: Box::new(Ast::Empty(<span class="self">self</span>.span())), |
| })) |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>capture_index = <span class="self">self</span>.next_capture_index(open_span)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(Either::Right(ast::Group { |
| span: open_span, |
| kind: ast::GroupKind::CaptureIndex(capture_index), |
| ast: Box::new(Ast::Empty(<span class="self">self</span>.span())), |
| })) |
| } |
| } |
| |
| <span class="doccomment">/// Parses a capture group name. Assumes that the parser is positioned at |
| /// the first character in the name following the opening `<` (and may |
| /// possibly be EOF). This advances the parser to the first character |
| /// following the closing `>`. |
| /// |
| /// The caller must provide the capture index of the group for this name. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_capture_name( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| capture_index: u32, |
| ) -> <span class="prelude-ty">Result</span><ast::CaptureName> { |
| <span class="kw">if </span><span class="self">self</span>.is_eof() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self |
| </span>.error(<span class="self">self</span>.span(), ast::ErrorKind::GroupNameUnexpectedEof)); |
| } |
| <span class="kw">let </span>start = <span class="self">self</span>.pos(); |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span><span class="self">self</span>.char() == <span class="string">'>' </span>{ |
| <span class="kw">break</span>; |
| } |
| <span class="kw">if </span>!is_capture_char(<span class="self">self</span>.char(), <span class="self">self</span>.pos() == start) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| <span class="self">self</span>.span_char(), |
| ast::ErrorKind::GroupNameInvalid, |
| )); |
| } |
| <span class="kw">if </span>!<span class="self">self</span>.bump() { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="kw">let </span>end = <span class="self">self</span>.pos(); |
| <span class="kw">if </span><span class="self">self</span>.is_eof() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self |
| </span>.error(<span class="self">self</span>.span(), ast::ErrorKind::GroupNameUnexpectedEof)); |
| } |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">'>'</span>); |
| <span class="self">self</span>.bump(); |
| <span class="kw">let </span>name = <span class="kw-2">&</span><span class="self">self</span>.pattern()[start.offset..end.offset]; |
| <span class="kw">if </span>name.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, start), |
| ast::ErrorKind::GroupNameEmpty, |
| )); |
| } |
| <span class="kw">let </span>capname = ast::CaptureName { |
| span: Span::new(start, end), |
| name: name.to_string(), |
| index: capture_index, |
| }; |
| <span class="self">self</span>.add_capture_name(<span class="kw-2">&</span>capname)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(capname) |
| } |
| |
| <span class="doccomment">/// Parse a sequence of flags starting at the current character. |
| /// |
| /// This advances the parser to the character immediately following the |
| /// flags, which is guaranteed to be either `:` or `)`. |
| /// |
| /// # Errors |
| /// |
| /// If any flags are duplicated, then an error is returned. |
| /// |
| /// If the negation operator is used more than once, then an error is |
| /// returned. |
| /// |
| /// If no flags could be found or if the negation operation is not followed |
| /// by any flags, then an error is returned. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_flags(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><ast::Flags> { |
| <span class="kw">let </span><span class="kw-2">mut </span>flags = ast::Flags { span: <span class="self">self</span>.span(), items: <span class="macro">vec!</span>[] }; |
| <span class="kw">let </span><span class="kw-2">mut </span>last_was_negation = <span class="prelude-val">None</span>; |
| <span class="kw">while </span><span class="self">self</span>.char() != <span class="string">':' </span>&& <span class="self">self</span>.char() != <span class="string">')' </span>{ |
| <span class="kw">if </span><span class="self">self</span>.char() == <span class="string">'-' </span>{ |
| last_was_negation = <span class="prelude-val">Some</span>(<span class="self">self</span>.span_char()); |
| <span class="kw">let </span>item = ast::FlagsItem { |
| span: <span class="self">self</span>.span_char(), |
| kind: ast::FlagsItemKind::Negation, |
| }; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(i) = flags.add_item(item) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| <span class="self">self</span>.span_char(), |
| ast::ErrorKind::FlagRepeatedNegation { |
| original: flags.items[i].span, |
| }, |
| )); |
| } |
| } <span class="kw">else </span>{ |
| last_was_negation = <span class="prelude-val">None</span>; |
| <span class="kw">let </span>item = ast::FlagsItem { |
| span: <span class="self">self</span>.span_char(), |
| kind: ast::FlagsItemKind::Flag(<span class="self">self</span>.parse_flag()<span class="question-mark">?</span>), |
| }; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(i) = flags.add_item(item) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| <span class="self">self</span>.span_char(), |
| ast::ErrorKind::FlagDuplicate { |
| original: flags.items[i].span, |
| }, |
| )); |
| } |
| } |
| <span class="kw">if </span>!<span class="self">self</span>.bump() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| <span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::FlagUnexpectedEof) |
| ); |
| } |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(span) = last_was_negation { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(span, ast::ErrorKind::FlagDanglingNegation)); |
| } |
| flags.span.end = <span class="self">self</span>.pos(); |
| <span class="prelude-val">Ok</span>(flags) |
| } |
| |
| <span class="doccomment">/// Parse the current character as a flag. Do not advance the parser. |
| /// |
| /// # Errors |
| /// |
| /// If the flag is not recognized, then an error is returned. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_flag(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><ast::Flag> { |
| <span class="kw">match </span><span class="self">self</span>.char() { |
| <span class="string">'i' </span>=> <span class="prelude-val">Ok</span>(ast::Flag::CaseInsensitive), |
| <span class="string">'m' </span>=> <span class="prelude-val">Ok</span>(ast::Flag::MultiLine), |
| <span class="string">'s' </span>=> <span class="prelude-val">Ok</span>(ast::Flag::DotMatchesNewLine), |
| <span class="string">'U' </span>=> <span class="prelude-val">Ok</span>(ast::Flag::SwapGreed), |
| <span class="string">'u' </span>=> <span class="prelude-val">Ok</span>(ast::Flag::Unicode), |
| <span class="string">'R' </span>=> <span class="prelude-val">Ok</span>(ast::Flag::CRLF), |
| <span class="string">'x' </span>=> <span class="prelude-val">Ok</span>(ast::Flag::IgnoreWhitespace), |
| <span class="kw">_ </span>=> { |
| <span class="prelude-val">Err</span>(<span class="self">self |
| </span>.error(<span class="self">self</span>.span_char(), ast::ErrorKind::FlagUnrecognized)) |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Parse a primitive AST. e.g., A literal, non-set character class or |
| /// assertion. |
| /// |
| /// This assumes that the parser expects a primitive at the current |
| /// location. i.e., All other non-primitive cases have been handled. |
| /// For example, if the parser's position is at `|`, then `|` will be |
| /// treated as a literal (e.g., inside a character class). |
| /// |
| /// This advances the parser to the first character immediately following |
| /// the primitive. |
| </span><span class="kw">fn </span>parse_primitive(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><Primitive> { |
| <span class="kw">match </span><span class="self">self</span>.char() { |
| <span class="string">'\\' </span>=> <span class="self">self</span>.parse_escape(), |
| <span class="string">'.' </span>=> { |
| <span class="kw">let </span>ast = Primitive::Dot(<span class="self">self</span>.span_char()); |
| <span class="self">self</span>.bump(); |
| <span class="prelude-val">Ok</span>(ast) |
| } |
| <span class="string">'^' </span>=> { |
| <span class="kw">let </span>ast = Primitive::Assertion(ast::Assertion { |
| span: <span class="self">self</span>.span_char(), |
| kind: ast::AssertionKind::StartLine, |
| }); |
| <span class="self">self</span>.bump(); |
| <span class="prelude-val">Ok</span>(ast) |
| } |
| <span class="string">'$' </span>=> { |
| <span class="kw">let </span>ast = Primitive::Assertion(ast::Assertion { |
| span: <span class="self">self</span>.span_char(), |
| kind: ast::AssertionKind::EndLine, |
| }); |
| <span class="self">self</span>.bump(); |
| <span class="prelude-val">Ok</span>(ast) |
| } |
| c => { |
| <span class="kw">let </span>ast = Primitive::Literal(ast::Literal { |
| span: <span class="self">self</span>.span_char(), |
| kind: ast::LiteralKind::Verbatim, |
| c, |
| }); |
| <span class="self">self</span>.bump(); |
| <span class="prelude-val">Ok</span>(ast) |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Parse an escape sequence as a primitive AST. |
| /// |
| /// This assumes the parser is positioned at the start of the escape |
| /// sequence, i.e., `\`. It advances the parser to the first position |
| /// immediately following the escape sequence. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_escape(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><Primitive> { |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">'\\'</span>); |
| <span class="kw">let </span>start = <span class="self">self</span>.pos(); |
| <span class="kw">if </span>!<span class="self">self</span>.bump() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, <span class="self">self</span>.pos()), |
| ast::ErrorKind::EscapeUnexpectedEof, |
| )); |
| } |
| <span class="kw">let </span>c = <span class="self">self</span>.char(); |
| <span class="comment">// Put some of the more complicated routines into helpers. |
| </span><span class="kw">match </span>c { |
| <span class="string">'0'</span>..=<span class="string">'7' </span>=> { |
| <span class="kw">if </span>!<span class="self">self</span>.parser().octal { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, <span class="self">self</span>.span_char().end), |
| ast::ErrorKind::UnsupportedBackreference, |
| )); |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>lit = <span class="self">self</span>.parse_octal(); |
| lit.span.start = start; |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Primitive::Literal(lit)); |
| } |
| <span class="string">'8'</span>..=<span class="string">'9' </span><span class="kw">if </span>!<span class="self">self</span>.parser().octal => { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, <span class="self">self</span>.span_char().end), |
| ast::ErrorKind::UnsupportedBackreference, |
| )); |
| } |
| <span class="string">'x' </span>| <span class="string">'u' </span>| <span class="string">'U' </span>=> { |
| <span class="kw">let </span><span class="kw-2">mut </span>lit = <span class="self">self</span>.parse_hex()<span class="question-mark">?</span>; |
| lit.span.start = start; |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Primitive::Literal(lit)); |
| } |
| <span class="string">'p' </span>| <span class="string">'P' </span>=> { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls = <span class="self">self</span>.parse_unicode_class()<span class="question-mark">?</span>; |
| cls.span.start = start; |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Primitive::Unicode(cls)); |
| } |
| <span class="string">'d' </span>| <span class="string">'s' </span>| <span class="string">'w' </span>| <span class="string">'D' </span>| <span class="string">'S' </span>| <span class="string">'W' </span>=> { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls = <span class="self">self</span>.parse_perl_class(); |
| cls.span.start = start; |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Primitive::Perl(cls)); |
| } |
| <span class="kw">_ </span>=> {} |
| } |
| |
| <span class="comment">// Handle all of the one letter sequences inline. |
| </span><span class="self">self</span>.bump(); |
| <span class="kw">let </span>span = Span::new(start, <span class="self">self</span>.pos()); |
| <span class="kw">if </span>is_meta_character(c) { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span, |
| kind: ast::LiteralKind::Meta, |
| c, |
| })); |
| } |
| <span class="kw">if </span>is_escapeable_character(c) { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span, |
| kind: ast::LiteralKind::Superfluous, |
| c, |
| })); |
| } |
| <span class="kw">let </span>special = |kind, c| { |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span, |
| kind: ast::LiteralKind::Special(kind), |
| c, |
| })) |
| }; |
| <span class="kw">match </span>c { |
| <span class="string">'a' </span>=> special(ast::SpecialLiteralKind::Bell, <span class="string">'\x07'</span>), |
| <span class="string">'f' </span>=> special(ast::SpecialLiteralKind::FormFeed, <span class="string">'\x0C'</span>), |
| <span class="string">'t' </span>=> special(ast::SpecialLiteralKind::Tab, <span class="string">'\t'</span>), |
| <span class="string">'n' </span>=> special(ast::SpecialLiteralKind::LineFeed, <span class="string">'\n'</span>), |
| <span class="string">'r' </span>=> special(ast::SpecialLiteralKind::CarriageReturn, <span class="string">'\r'</span>), |
| <span class="string">'v' </span>=> special(ast::SpecialLiteralKind::VerticalTab, <span class="string">'\x0B'</span>), |
| <span class="string">'A' </span>=> <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion { |
| span, |
| kind: ast::AssertionKind::StartText, |
| })), |
| <span class="string">'z' </span>=> <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion { |
| span, |
| kind: ast::AssertionKind::EndText, |
| })), |
| <span class="string">'b' </span>=> <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion { |
| span, |
| kind: ast::AssertionKind::WordBoundary, |
| })), |
| <span class="string">'B' </span>=> <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion { |
| span, |
| kind: ast::AssertionKind::NotWordBoundary, |
| })), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.error(span, ast::ErrorKind::EscapeUnrecognized)), |
| } |
| } |
| |
| <span class="doccomment">/// Parse an octal representation of a Unicode codepoint up to 3 digits |
| /// long. This expects the parser to be positioned at the first octal |
| /// digit and advances the parser to the first character immediately |
| /// following the octal number. This also assumes that parsing octal |
| /// escapes is enabled. |
| /// |
| /// Assuming the preconditions are met, this routine can never fail. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_octal(<span class="kw-2">&</span><span class="self">self</span>) -> ast::Literal { |
| <span class="macro">assert!</span>(<span class="self">self</span>.parser().octal); |
| <span class="macro">assert!</span>(<span class="string">'0' </span><= <span class="self">self</span>.char() && <span class="self">self</span>.char() <= <span class="string">'7'</span>); |
| <span class="kw">let </span>start = <span class="self">self</span>.pos(); |
| <span class="comment">// Parse up to two more digits. |
| </span><span class="kw">while </span><span class="self">self</span>.bump() |
| && <span class="string">'0' </span><= <span class="self">self</span>.char() |
| && <span class="self">self</span>.char() <= <span class="string">'7' |
| </span>&& <span class="self">self</span>.pos().offset - start.offset <= <span class="number">2 |
| </span>{} |
| <span class="kw">let </span>end = <span class="self">self</span>.pos(); |
| <span class="kw">let </span>octal = <span class="kw-2">&</span><span class="self">self</span>.pattern()[start.offset..end.offset]; |
| <span class="comment">// Parsing the octal should never fail since the above guarantees a |
| // valid number. |
| </span><span class="kw">let </span>codepoint = |
| u32::from_str_radix(octal, <span class="number">8</span>).expect(<span class="string">"valid octal number"</span>); |
| <span class="comment">// The max value for 3 digit octal is 0777 = 511 and [0, 511] has no |
| // invalid Unicode scalar values. |
| </span><span class="kw">let </span>c = char::from_u32(codepoint).expect(<span class="string">"Unicode scalar value"</span>); |
| ast::Literal { |
| span: Span::new(start, end), |
| kind: ast::LiteralKind::Octal, |
| c, |
| } |
| } |
| |
| <span class="doccomment">/// Parse a hex representation of a Unicode codepoint. This handles both |
| /// hex notations, i.e., `\xFF` and `\x{FFFF}`. This expects the parser to |
| /// be positioned at the `x`, `u` or `U` prefix. The parser is advanced to |
| /// the first character immediately following the hexadecimal literal. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_hex(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><ast::Literal> { |
| <span class="macro">assert!</span>( |
| <span class="self">self</span>.char() == <span class="string">'x' </span>|| <span class="self">self</span>.char() == <span class="string">'u' </span>|| <span class="self">self</span>.char() == <span class="string">'U' |
| </span>); |
| |
| <span class="kw">let </span>hex_kind = <span class="kw">match </span><span class="self">self</span>.char() { |
| <span class="string">'x' </span>=> ast::HexLiteralKind::X, |
| <span class="string">'u' </span>=> ast::HexLiteralKind::UnicodeShort, |
| <span class="kw">_ </span>=> ast::HexLiteralKind::UnicodeLong, |
| }; |
| <span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| <span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::EscapeUnexpectedEof) |
| ); |
| } |
| <span class="kw">if </span><span class="self">self</span>.char() == <span class="string">'{' </span>{ |
| <span class="self">self</span>.parse_hex_brace(hex_kind) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.parse_hex_digits(hex_kind) |
| } |
| } |
| |
| <span class="doccomment">/// Parse an N-digit hex representation of a Unicode codepoint. This |
| /// expects the parser to be positioned at the first digit and will advance |
| /// the parser to the first character immediately following the escape |
| /// sequence. |
| /// |
| /// The number of digits given must be 2 (for `\xNN`), 4 (for `\uNNNN`) |
| /// or 8 (for `\UNNNNNNNN`). |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_hex_digits( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| kind: ast::HexLiteralKind, |
| ) -> <span class="prelude-ty">Result</span><ast::Literal> { |
| <span class="kw">let </span><span class="kw-2">mut </span>scratch = <span class="self">self</span>.parser().scratch.borrow_mut(); |
| scratch.clear(); |
| |
| <span class="kw">let </span>start = <span class="self">self</span>.pos(); |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..kind.digits() { |
| <span class="kw">if </span>i > <span class="number">0 </span>&& !<span class="self">self</span>.bump_and_bump_space() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self |
| </span>.error(<span class="self">self</span>.span(), ast::ErrorKind::EscapeUnexpectedEof)); |
| } |
| <span class="kw">if </span>!is_hex(<span class="self">self</span>.char()) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| <span class="self">self</span>.span_char(), |
| ast::ErrorKind::EscapeHexInvalidDigit, |
| )); |
| } |
| scratch.push(<span class="self">self</span>.char()); |
| } |
| <span class="comment">// The final bump just moves the parser past the literal, which may |
| // be EOF. |
| </span><span class="self">self</span>.bump_and_bump_space(); |
| <span class="kw">let </span>end = <span class="self">self</span>.pos(); |
| <span class="kw">let </span>hex = scratch.as_str(); |
| <span class="kw">match </span>u32::from_str_radix(hex, <span class="number">16</span>).ok().and_then(char::from_u32) { |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, end), |
| ast::ErrorKind::EscapeHexInvalid, |
| )), |
| <span class="prelude-val">Some</span>(c) => <span class="prelude-val">Ok</span>(ast::Literal { |
| span: Span::new(start, end), |
| kind: ast::LiteralKind::HexFixed(kind), |
| c, |
| }), |
| } |
| } |
| |
| <span class="doccomment">/// Parse a hex representation of any Unicode scalar value. This expects |
| /// the parser to be positioned at the opening brace `{` and will advance |
| /// the parser to the first character following the closing brace `}`. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_hex_brace( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| kind: ast::HexLiteralKind, |
| ) -> <span class="prelude-ty">Result</span><ast::Literal> { |
| <span class="kw">let </span><span class="kw-2">mut </span>scratch = <span class="self">self</span>.parser().scratch.borrow_mut(); |
| scratch.clear(); |
| |
| <span class="kw">let </span>brace_pos = <span class="self">self</span>.pos(); |
| <span class="kw">let </span>start = <span class="self">self</span>.span_char().end; |
| <span class="kw">while </span><span class="self">self</span>.bump_and_bump_space() && <span class="self">self</span>.char() != <span class="string">'}' </span>{ |
| <span class="kw">if </span>!is_hex(<span class="self">self</span>.char()) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| <span class="self">self</span>.span_char(), |
| ast::ErrorKind::EscapeHexInvalidDigit, |
| )); |
| } |
| scratch.push(<span class="self">self</span>.char()); |
| } |
| <span class="kw">if </span><span class="self">self</span>.is_eof() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(brace_pos, <span class="self">self</span>.pos()), |
| ast::ErrorKind::EscapeUnexpectedEof, |
| )); |
| } |
| <span class="kw">let </span>end = <span class="self">self</span>.pos(); |
| <span class="kw">let </span>hex = scratch.as_str(); |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">'}'</span>); |
| <span class="self">self</span>.bump_and_bump_space(); |
| |
| <span class="kw">if </span>hex.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(brace_pos, <span class="self">self</span>.pos()), |
| ast::ErrorKind::EscapeHexEmpty, |
| )); |
| } |
| <span class="kw">match </span>u32::from_str_radix(hex, <span class="number">16</span>).ok().and_then(char::from_u32) { |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, end), |
| ast::ErrorKind::EscapeHexInvalid, |
| )), |
| <span class="prelude-val">Some</span>(c) => <span class="prelude-val">Ok</span>(ast::Literal { |
| span: Span::new(start, <span class="self">self</span>.pos()), |
| kind: ast::LiteralKind::HexBrace(kind), |
| c, |
| }), |
| } |
| } |
| |
| <span class="doccomment">/// Parse a decimal number into a u32 while trimming leading and trailing |
| /// whitespace. |
| /// |
| /// This expects the parser to be positioned at the first position where |
| /// a decimal digit could occur. This will advance the parser to the byte |
| /// immediately following the last contiguous decimal digit. |
| /// |
| /// If no decimal digit could be found or if there was a problem parsing |
| /// the complete set of digits into a u32, then an error is returned. |
| </span><span class="kw">fn </span>parse_decimal(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><u32> { |
| <span class="kw">let </span><span class="kw-2">mut </span>scratch = <span class="self">self</span>.parser().scratch.borrow_mut(); |
| scratch.clear(); |
| |
| <span class="kw">while </span>!<span class="self">self</span>.is_eof() && <span class="self">self</span>.char().is_whitespace() { |
| <span class="self">self</span>.bump(); |
| } |
| <span class="kw">let </span>start = <span class="self">self</span>.pos(); |
| <span class="kw">while </span>!<span class="self">self</span>.is_eof() && <span class="string">'0' </span><= <span class="self">self</span>.char() && <span class="self">self</span>.char() <= <span class="string">'9' </span>{ |
| scratch.push(<span class="self">self</span>.char()); |
| <span class="self">self</span>.bump_and_bump_space(); |
| } |
| <span class="kw">let </span>span = Span::new(start, <span class="self">self</span>.pos()); |
| <span class="kw">while </span>!<span class="self">self</span>.is_eof() && <span class="self">self</span>.char().is_whitespace() { |
| <span class="self">self</span>.bump_and_bump_space(); |
| } |
| <span class="kw">let </span>digits = scratch.as_str(); |
| <span class="kw">if </span>digits.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(span, ast::ErrorKind::DecimalEmpty)); |
| } |
| <span class="kw">match </span>u32::from_str_radix(digits, <span class="number">10</span>).ok() { |
| <span class="prelude-val">Some</span>(n) => <span class="prelude-val">Ok</span>(n), |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.error(span, ast::ErrorKind::DecimalInvalid)), |
| } |
| } |
| |
| <span class="doccomment">/// Parse a standard character class consisting primarily of characters or |
| /// character ranges, but can also contain nested character classes of |
| /// any type (sans `.`). |
| /// |
| /// This assumes the parser is positioned at the opening `[`. If parsing |
| /// is successful, then the parser is advanced to the position immediately |
| /// following the closing `]`. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_set_class(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><ast::Class> { |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">'['</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>union = |
| ast::ClassSetUnion { span: <span class="self">self</span>.span(), items: <span class="macro">vec!</span>[] }; |
| <span class="kw">loop </span>{ |
| <span class="self">self</span>.bump_space(); |
| <span class="kw">if </span><span class="self">self</span>.is_eof() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.unclosed_class_error()); |
| } |
| <span class="kw">match </span><span class="self">self</span>.char() { |
| <span class="string">'[' </span>=> { |
| <span class="comment">// If we've already parsed the opening bracket, then |
| // attempt to treat this as the beginning of an ASCII |
| // class. If ASCII class parsing fails, then the parser |
| // backs up to `[`. |
| </span><span class="kw">if </span>!<span class="self">self</span>.parser().stack_class.borrow().is_empty() { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(cls) = <span class="self">self</span>.maybe_parse_ascii_class() { |
| union.push(ast::ClassSetItem::Ascii(cls)); |
| <span class="kw">continue</span>; |
| } |
| } |
| union = <span class="self">self</span>.push_class_open(union)<span class="question-mark">?</span>; |
| } |
| <span class="string">']' </span>=> <span class="kw">match </span><span class="self">self</span>.pop_class(union)<span class="question-mark">? </span>{ |
| Either::Left(nested_union) => { |
| union = nested_union; |
| } |
| Either::Right(class) => <span class="kw">return </span><span class="prelude-val">Ok</span>(class), |
| }, |
| <span class="string">'&' </span><span class="kw">if </span><span class="self">self</span>.peek() == <span class="prelude-val">Some</span>(<span class="string">'&'</span>) => { |
| <span class="macro">assert!</span>(<span class="self">self</span>.bump_if(<span class="string">"&&"</span>)); |
| union = <span class="self">self</span>.push_class_op( |
| ast::ClassSetBinaryOpKind::Intersection, |
| union, |
| ); |
| } |
| <span class="string">'-' </span><span class="kw">if </span><span class="self">self</span>.peek() == <span class="prelude-val">Some</span>(<span class="string">'-'</span>) => { |
| <span class="macro">assert!</span>(<span class="self">self</span>.bump_if(<span class="string">"--"</span>)); |
| union = <span class="self">self</span>.push_class_op( |
| ast::ClassSetBinaryOpKind::Difference, |
| union, |
| ); |
| } |
| <span class="string">'~' </span><span class="kw">if </span><span class="self">self</span>.peek() == <span class="prelude-val">Some</span>(<span class="string">'~'</span>) => { |
| <span class="macro">assert!</span>(<span class="self">self</span>.bump_if(<span class="string">"~~"</span>)); |
| union = <span class="self">self</span>.push_class_op( |
| ast::ClassSetBinaryOpKind::SymmetricDifference, |
| union, |
| ); |
| } |
| <span class="kw">_ </span>=> { |
| union.push(<span class="self">self</span>.parse_set_class_range()<span class="question-mark">?</span>); |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Parse a single primitive item in a character class set. The item to |
| /// be parsed can either be one of a simple literal character, a range |
| /// between two simple literal characters or a "primitive" character |
| /// class like \w or \p{Greek}. |
| /// |
| /// If an invalid escape is found, or if a character class is found where |
| /// a simple literal is expected (e.g., in a range), then an error is |
| /// returned. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_set_class_range(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><ast::ClassSetItem> { |
| <span class="kw">let </span>prim1 = <span class="self">self</span>.parse_set_class_item()<span class="question-mark">?</span>; |
| <span class="self">self</span>.bump_space(); |
| <span class="kw">if </span><span class="self">self</span>.is_eof() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.unclosed_class_error()); |
| } |
| <span class="comment">// If the next char isn't a `-`, then we don't have a range. |
| // There are two exceptions. If the char after a `-` is a `]`, then |
| // `-` is interpreted as a literal `-`. Alternatively, if the char |
| // after a `-` is a `-`, then `--` corresponds to a "difference" |
| // operation. |
| </span><span class="kw">if </span><span class="self">self</span>.char() != <span class="string">'-' |
| </span>|| <span class="self">self</span>.peek_space() == <span class="prelude-val">Some</span>(<span class="string">']'</span>) |
| || <span class="self">self</span>.peek_space() == <span class="prelude-val">Some</span>(<span class="string">'-'</span>) |
| { |
| <span class="kw">return </span>prim1.into_class_set_item(<span class="self">self</span>); |
| } |
| <span class="comment">// OK, now we're parsing a range, so bump past the `-` and parse the |
| // second half of the range. |
| </span><span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.unclosed_class_error()); |
| } |
| <span class="kw">let </span>prim2 = <span class="self">self</span>.parse_set_class_item()<span class="question-mark">?</span>; |
| <span class="kw">let </span>range = ast::ClassSetRange { |
| span: Span::new(prim1.span().start, prim2.span().end), |
| start: prim1.into_class_literal(<span class="self">self</span>)<span class="question-mark">?</span>, |
| end: prim2.into_class_literal(<span class="self">self</span>)<span class="question-mark">?</span>, |
| }; |
| <span class="kw">if </span>!range.is_valid() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| <span class="self">self</span>.error(range.span, ast::ErrorKind::ClassRangeInvalid) |
| ); |
| } |
| <span class="prelude-val">Ok</span>(ast::ClassSetItem::Range(range)) |
| } |
| |
| <span class="doccomment">/// Parse a single item in a character class as a primitive, where the |
| /// primitive either consists of a verbatim literal or a single escape |
| /// sequence. |
| /// |
| /// This assumes the parser is positioned at the beginning of a primitive, |
| /// and advances the parser to the first position after the primitive if |
| /// successful. |
| /// |
| /// Note that it is the caller's responsibility to report an error if an |
| /// illegal primitive was parsed. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_set_class_item(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><Primitive> { |
| <span class="kw">if </span><span class="self">self</span>.char() == <span class="string">'\\' </span>{ |
| <span class="self">self</span>.parse_escape() |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>x = Primitive::Literal(ast::Literal { |
| span: <span class="self">self</span>.span_char(), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="self">self</span>.char(), |
| }); |
| <span class="self">self</span>.bump(); |
| <span class="prelude-val">Ok</span>(x) |
| } |
| } |
| |
| <span class="doccomment">/// Parses the opening of a character class set. This includes the opening |
| /// bracket along with `^` if present to indicate negation. This also |
| /// starts parsing the opening set of unioned items if applicable, since |
| /// there are special rules applied to certain characters in the opening |
| /// of a character class. For example, `[^]]` is the class of all |
| /// characters not equal to `]`. (`]` would need to be escaped in any other |
| /// position.) Similarly for `-`. |
| /// |
| /// In all cases, the op inside the returned `ast::ClassBracketed` is an |
| /// empty union. This empty union should be replaced with the actual item |
| /// when it is popped from the parser's stack. |
| /// |
| /// This assumes the parser is positioned at the opening `[` and advances |
| /// the parser to the first non-special byte of the character class. |
| /// |
| /// An error is returned if EOF is found. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_set_class_open( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| ) -> <span class="prelude-ty">Result</span><(ast::ClassBracketed, ast::ClassSetUnion)> { |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">'['</span>); |
| <span class="kw">let </span>start = <span class="self">self</span>.pos(); |
| <span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, <span class="self">self</span>.pos()), |
| ast::ErrorKind::ClassUnclosed, |
| )); |
| } |
| |
| <span class="kw">let </span>negated = <span class="kw">if </span><span class="self">self</span>.char() != <span class="string">'^' </span>{ |
| <span class="bool-val">false |
| </span>} <span class="kw">else </span>{ |
| <span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, <span class="self">self</span>.pos()), |
| ast::ErrorKind::ClassUnclosed, |
| )); |
| } |
| <span class="bool-val">true |
| </span>}; |
| <span class="comment">// Accept any number of `-` as literal `-`. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>union = |
| ast::ClassSetUnion { span: <span class="self">self</span>.span(), items: <span class="macro">vec!</span>[] }; |
| <span class="kw">while </span><span class="self">self</span>.char() == <span class="string">'-' </span>{ |
| union.push(ast::ClassSetItem::Literal(ast::Literal { |
| span: <span class="self">self</span>.span_char(), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'-'</span>, |
| })); |
| <span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, start), |
| ast::ErrorKind::ClassUnclosed, |
| )); |
| } |
| } |
| <span class="comment">// If `]` is the *first* char in a set, then interpret it as a literal |
| // `]`. That is, an empty class is impossible to write. |
| </span><span class="kw">if </span>union.items.is_empty() && <span class="self">self</span>.char() == <span class="string">']' </span>{ |
| union.push(ast::ClassSetItem::Literal(ast::Literal { |
| span: <span class="self">self</span>.span_char(), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">']'</span>, |
| })); |
| <span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| Span::new(start, <span class="self">self</span>.pos()), |
| ast::ErrorKind::ClassUnclosed, |
| )); |
| } |
| } |
| <span class="kw">let </span>set = ast::ClassBracketed { |
| span: Span::new(start, <span class="self">self</span>.pos()), |
| negated, |
| kind: ast::ClassSet::union(ast::ClassSetUnion { |
| span: Span::new(union.span.start, union.span.start), |
| items: <span class="macro">vec!</span>[], |
| }), |
| }; |
| <span class="prelude-val">Ok</span>((set, union)) |
| } |
| |
| <span class="doccomment">/// Attempt to parse an ASCII character class, e.g., `[:alnum:]`. |
| /// |
| /// This assumes the parser is positioned at the opening `[`. |
| /// |
| /// If no valid ASCII character class could be found, then this does not |
| /// advance the parser and `None` is returned. Otherwise, the parser is |
| /// advanced to the first byte following the closing `]` and the |
| /// corresponding ASCII class is returned. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>maybe_parse_ascii_class(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><ast::ClassAscii> { |
| <span class="comment">// ASCII character classes are interesting from a parsing perspective |
| // because parsing cannot fail with any interesting error. For example, |
| // in order to use an ASCII character class, it must be enclosed in |
| // double brackets, e.g., `[[:alnum:]]`. Alternatively, you might think |
| // of it as "ASCII character characters have the syntax `[:NAME:]` |
| // which can only appear within character brackets." This means that |
| // things like `[[:lower:]A]` are legal constructs. |
| // |
| // However, if one types an incorrect ASCII character class, e.g., |
| // `[[:loower:]]`, then we treat that as a normal nested character |
| // class containing the characters `:elorw`. One might argue that we |
| // should return an error instead since the repeated colons give away |
| // the intent to write an ASCII class. But what if the user typed |
| // `[[:lower]]` instead? How can we tell that was intended to be an |
| // ASCII class and not just a normal nested class? |
| // |
| // Reasonable people can probably disagree over this, but for better |
| // or worse, we implement semantics that never fails at the expense |
| // of better failure modes. |
| </span><span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">'['</span>); |
| <span class="comment">// If parsing fails, then we back up the parser to this starting point. |
| </span><span class="kw">let </span>start = <span class="self">self</span>.pos(); |
| <span class="kw">let </span><span class="kw-2">mut </span>negated = <span class="bool-val">false</span>; |
| <span class="kw">if </span>!<span class="self">self</span>.bump() || <span class="self">self</span>.char() != <span class="string">':' </span>{ |
| <span class="self">self</span>.parser().pos.set(start); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="kw">if </span>!<span class="self">self</span>.bump() { |
| <span class="self">self</span>.parser().pos.set(start); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="kw">if </span><span class="self">self</span>.char() == <span class="string">'^' </span>{ |
| negated = <span class="bool-val">true</span>; |
| <span class="kw">if </span>!<span class="self">self</span>.bump() { |
| <span class="self">self</span>.parser().pos.set(start); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| } |
| <span class="kw">let </span>name_start = <span class="self">self</span>.offset(); |
| <span class="kw">while </span><span class="self">self</span>.char() != <span class="string">':' </span>&& <span class="self">self</span>.bump() {} |
| <span class="kw">if </span><span class="self">self</span>.is_eof() { |
| <span class="self">self</span>.parser().pos.set(start); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="kw">let </span>name = <span class="kw-2">&</span><span class="self">self</span>.pattern()[name_start..<span class="self">self</span>.offset()]; |
| <span class="kw">if </span>!<span class="self">self</span>.bump_if(<span class="string">":]"</span>) { |
| <span class="self">self</span>.parser().pos.set(start); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="kw">let </span>kind = <span class="kw">match </span>ast::ClassAsciiKind::from_name(name) { |
| <span class="prelude-val">Some</span>(kind) => kind, |
| <span class="prelude-val">None </span>=> { |
| <span class="self">self</span>.parser().pos.set(start); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| }; |
| <span class="prelude-val">Some</span>(ast::ClassAscii { |
| span: Span::new(start, <span class="self">self</span>.pos()), |
| kind, |
| negated, |
| }) |
| } |
| |
| <span class="doccomment">/// Parse a Unicode class in either the single character notation, `\pN` |
| /// or the multi-character bracketed notation, `\p{Greek}`. This assumes |
| /// the parser is positioned at the `p` (or `P` for negation) and will |
| /// advance the parser to the character immediately following the class. |
| /// |
| /// Note that this does not check whether the class name is valid or not. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_unicode_class(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><ast::ClassUnicode> { |
| <span class="macro">assert!</span>(<span class="self">self</span>.char() == <span class="string">'p' </span>|| <span class="self">self</span>.char() == <span class="string">'P'</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>scratch = <span class="self">self</span>.parser().scratch.borrow_mut(); |
| scratch.clear(); |
| |
| <span class="kw">let </span>negated = <span class="self">self</span>.char() == <span class="string">'P'</span>; |
| <span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| <span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::EscapeUnexpectedEof) |
| ); |
| } |
| <span class="kw">let </span>(start, kind) = <span class="kw">if </span><span class="self">self</span>.char() == <span class="string">'{' </span>{ |
| <span class="kw">let </span>start = <span class="self">self</span>.span_char().end; |
| <span class="kw">while </span><span class="self">self</span>.bump_and_bump_space() && <span class="self">self</span>.char() != <span class="string">'}' </span>{ |
| scratch.push(<span class="self">self</span>.char()); |
| } |
| <span class="kw">if </span><span class="self">self</span>.is_eof() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self |
| </span>.error(<span class="self">self</span>.span(), ast::ErrorKind::EscapeUnexpectedEof)); |
| } |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">'}'</span>); |
| <span class="self">self</span>.bump(); |
| |
| <span class="kw">let </span>name = scratch.as_str(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(i) = name.find(<span class="string">"!="</span>) { |
| ( |
| start, |
| ast::ClassUnicodeKind::NamedValue { |
| op: ast::ClassUnicodeOpKind::NotEqual, |
| name: name[..i].to_string(), |
| value: name[i + <span class="number">2</span>..].to_string(), |
| }, |
| ) |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(i) = name.find(<span class="string">':'</span>) { |
| ( |
| start, |
| ast::ClassUnicodeKind::NamedValue { |
| op: ast::ClassUnicodeOpKind::Colon, |
| name: name[..i].to_string(), |
| value: name[i + <span class="number">1</span>..].to_string(), |
| }, |
| ) |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(i) = name.find(<span class="string">'='</span>) { |
| ( |
| start, |
| ast::ClassUnicodeKind::NamedValue { |
| op: ast::ClassUnicodeOpKind::Equal, |
| name: name[..i].to_string(), |
| value: name[i + <span class="number">1</span>..].to_string(), |
| }, |
| ) |
| } <span class="kw">else </span>{ |
| (start, ast::ClassUnicodeKind::Named(name.to_string())) |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>start = <span class="self">self</span>.pos(); |
| <span class="kw">let </span>c = <span class="self">self</span>.char(); |
| <span class="kw">if </span>c == <span class="string">'\\' </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error( |
| <span class="self">self</span>.span_char(), |
| ast::ErrorKind::UnicodeClassInvalid, |
| )); |
| } |
| <span class="self">self</span>.bump_and_bump_space(); |
| <span class="kw">let </span>kind = ast::ClassUnicodeKind::OneLetter(c); |
| (start, kind) |
| }; |
| <span class="prelude-val">Ok</span>(ast::ClassUnicode { |
| span: Span::new(start, <span class="self">self</span>.pos()), |
| negated, |
| kind, |
| }) |
| } |
| |
| <span class="doccomment">/// Parse a Perl character class, e.g., `\d` or `\W`. This assumes the |
| /// parser is currently at a valid character class name and will be |
| /// advanced to the character immediately following the class. |
| </span><span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>parse_perl_class(<span class="kw-2">&</span><span class="self">self</span>) -> ast::ClassPerl { |
| <span class="kw">let </span>c = <span class="self">self</span>.char(); |
| <span class="kw">let </span>span = <span class="self">self</span>.span_char(); |
| <span class="self">self</span>.bump(); |
| <span class="kw">let </span>(negated, kind) = <span class="kw">match </span>c { |
| <span class="string">'d' </span>=> (<span class="bool-val">false</span>, ast::ClassPerlKind::Digit), |
| <span class="string">'D' </span>=> (<span class="bool-val">true</span>, ast::ClassPerlKind::Digit), |
| <span class="string">'s' </span>=> (<span class="bool-val">false</span>, ast::ClassPerlKind::Space), |
| <span class="string">'S' </span>=> (<span class="bool-val">true</span>, ast::ClassPerlKind::Space), |
| <span class="string">'w' </span>=> (<span class="bool-val">false</span>, ast::ClassPerlKind::Word), |
| <span class="string">'W' </span>=> (<span class="bool-val">true</span>, ast::ClassPerlKind::Word), |
| c => <span class="macro">panic!</span>(<span class="string">"expected valid Perl class but got '{}'"</span>, c), |
| }; |
| ast::ClassPerl { span, kind, negated } |
| } |
| } |
| |
| <span class="doccomment">/// A type that traverses a fully parsed Ast and checks whether its depth |
| /// exceeds the specified nesting limit. If it does, then an error is returned. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>NestLimiter<<span class="lifetime">'p</span>, <span class="lifetime">'s</span>, P> { |
| <span class="doccomment">/// The parser that is checking the nest limit. |
| </span>p: <span class="kw-2">&</span><span class="lifetime">'p </span>ParserI<<span class="lifetime">'s</span>, P>, |
| <span class="doccomment">/// The current depth while walking an Ast. |
| </span>depth: u32, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'p</span>, <span class="lifetime">'s</span>, P: Borrow<Parser>> NestLimiter<<span class="lifetime">'p</span>, <span class="lifetime">'s</span>, P> { |
| <span class="kw">fn </span>new(p: <span class="kw-2">&</span><span class="lifetime">'p </span>ParserI<<span class="lifetime">'s</span>, P>) -> NestLimiter<<span class="lifetime">'p</span>, <span class="lifetime">'s</span>, P> { |
| NestLimiter { p, depth: <span class="number">0 </span>} |
| } |
| |
| <span class="attribute">#[inline(never)] |
| </span><span class="kw">fn </span>check(<span class="self">self</span>, ast: <span class="kw-2">&</span>Ast) -> <span class="prelude-ty">Result</span><()> { |
| ast::visit(ast, <span class="self">self</span>) |
| } |
| |
| <span class="kw">fn </span>increment_depth(<span class="kw-2">&mut </span><span class="self">self</span>, span: <span class="kw-2">&</span>Span) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span>new = <span class="self">self</span>.depth.checked_add(<span class="number">1</span>).ok_or_else(|| { |
| <span class="self">self</span>.p.error( |
| span.clone(), |
| ast::ErrorKind::NestLimitExceeded(u32::MAX), |
| ) |
| })<span class="question-mark">?</span>; |
| <span class="kw">let </span>limit = <span class="self">self</span>.p.parser().nest_limit; |
| <span class="kw">if </span>new > limit { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.p.error( |
| span.clone(), |
| ast::ErrorKind::NestLimitExceeded(limit), |
| )); |
| } |
| <span class="self">self</span>.depth = new; |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>decrement_depth(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="comment">// Assuming the correctness of the visitor, this should never drop |
| // below 0. |
| </span><span class="self">self</span>.depth = <span class="self">self</span>.depth.checked_sub(<span class="number">1</span>).unwrap(); |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'p</span>, <span class="lifetime">'s</span>, P: Borrow<Parser>> ast::Visitor <span class="kw">for </span>NestLimiter<<span class="lifetime">'p</span>, <span class="lifetime">'s</span>, P> { |
| <span class="kw">type </span>Output = (); |
| <span class="kw">type </span><span class="prelude-val">Err </span>= ast::Error; |
| |
| <span class="kw">fn </span>finish(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>visit_pre(<span class="kw-2">&mut </span><span class="self">self</span>, ast: <span class="kw-2">&</span>Ast) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span>span = <span class="kw">match </span><span class="kw-2">*</span>ast { |
| Ast::Empty(<span class="kw">_</span>) |
| | Ast::Flags(<span class="kw">_</span>) |
| | Ast::Literal(<span class="kw">_</span>) |
| | Ast::Dot(<span class="kw">_</span>) |
| | Ast::Assertion(<span class="kw">_</span>) |
| | Ast::Class(ast::Class::Unicode(<span class="kw">_</span>)) |
| | Ast::Class(ast::Class::Perl(<span class="kw">_</span>)) => { |
| <span class="comment">// These are all base cases, so we don't increment depth. |
| </span><span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| Ast::Class(ast::Class::Bracketed(<span class="kw-2">ref </span>x)) => <span class="kw-2">&</span>x.span, |
| Ast::Repetition(<span class="kw-2">ref </span>x) => <span class="kw-2">&</span>x.span, |
| Ast::Group(<span class="kw-2">ref </span>x) => <span class="kw-2">&</span>x.span, |
| Ast::Alternation(<span class="kw-2">ref </span>x) => <span class="kw-2">&</span>x.span, |
| Ast::Concat(<span class="kw-2">ref </span>x) => <span class="kw-2">&</span>x.span, |
| }; |
| <span class="self">self</span>.increment_depth(span) |
| } |
| |
| <span class="kw">fn </span>visit_post(<span class="kw-2">&mut </span><span class="self">self</span>, ast: <span class="kw-2">&</span>Ast) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">match </span><span class="kw-2">*</span>ast { |
| Ast::Empty(<span class="kw">_</span>) |
| | Ast::Flags(<span class="kw">_</span>) |
| | Ast::Literal(<span class="kw">_</span>) |
| | Ast::Dot(<span class="kw">_</span>) |
| | Ast::Assertion(<span class="kw">_</span>) |
| | Ast::Class(ast::Class::Unicode(<span class="kw">_</span>)) |
| | Ast::Class(ast::Class::Perl(<span class="kw">_</span>)) => { |
| <span class="comment">// These are all base cases, so we don't decrement depth. |
| </span><span class="prelude-val">Ok</span>(()) |
| } |
| Ast::Class(ast::Class::Bracketed(<span class="kw">_</span>)) |
| | Ast::Repetition(<span class="kw">_</span>) |
| | Ast::Group(<span class="kw">_</span>) |
| | Ast::Alternation(<span class="kw">_</span>) |
| | Ast::Concat(<span class="kw">_</span>) => { |
| <span class="self">self</span>.decrement_depth(); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>visit_class_set_item_pre( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| ast: <span class="kw-2">&</span>ast::ClassSetItem, |
| ) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span>span = <span class="kw">match </span><span class="kw-2">*</span>ast { |
| ast::ClassSetItem::Empty(<span class="kw">_</span>) |
| | ast::ClassSetItem::Literal(<span class="kw">_</span>) |
| | ast::ClassSetItem::Range(<span class="kw">_</span>) |
| | ast::ClassSetItem::Ascii(<span class="kw">_</span>) |
| | ast::ClassSetItem::Unicode(<span class="kw">_</span>) |
| | ast::ClassSetItem::Perl(<span class="kw">_</span>) => { |
| <span class="comment">// These are all base cases, so we don't increment depth. |
| </span><span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| ast::ClassSetItem::Bracketed(<span class="kw-2">ref </span>x) => <span class="kw-2">&</span>x.span, |
| ast::ClassSetItem::Union(<span class="kw-2">ref </span>x) => <span class="kw-2">&</span>x.span, |
| }; |
| <span class="self">self</span>.increment_depth(span) |
| } |
| |
| <span class="kw">fn </span>visit_class_set_item_post( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| ast: <span class="kw-2">&</span>ast::ClassSetItem, |
| ) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">match </span><span class="kw-2">*</span>ast { |
| ast::ClassSetItem::Empty(<span class="kw">_</span>) |
| | ast::ClassSetItem::Literal(<span class="kw">_</span>) |
| | ast::ClassSetItem::Range(<span class="kw">_</span>) |
| | ast::ClassSetItem::Ascii(<span class="kw">_</span>) |
| | ast::ClassSetItem::Unicode(<span class="kw">_</span>) |
| | ast::ClassSetItem::Perl(<span class="kw">_</span>) => { |
| <span class="comment">// These are all base cases, so we don't decrement depth. |
| </span><span class="prelude-val">Ok</span>(()) |
| } |
| ast::ClassSetItem::Bracketed(<span class="kw">_</span>) | ast::ClassSetItem::Union(<span class="kw">_</span>) => { |
| <span class="self">self</span>.decrement_depth(); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>visit_class_set_binary_op_pre( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| ast: <span class="kw-2">&</span>ast::ClassSetBinaryOp, |
| ) -> <span class="prelude-ty">Result</span><()> { |
| <span class="self">self</span>.increment_depth(<span class="kw-2">&</span>ast.span) |
| } |
| |
| <span class="kw">fn </span>visit_class_set_binary_op_post( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| _ast: <span class="kw-2">&</span>ast::ClassSetBinaryOp, |
| ) -> <span class="prelude-ty">Result</span><()> { |
| <span class="self">self</span>.decrement_depth(); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="doccomment">/// When the result is an error, transforms the ast::ErrorKind from the source |
| /// Result into another one. This function is used to return clearer error |
| /// messages when possible. |
| </span><span class="kw">fn </span>specialize_err<T>( |
| result: <span class="prelude-ty">Result</span><T>, |
| from: ast::ErrorKind, |
| to: ast::ErrorKind, |
| ) -> <span class="prelude-ty">Result</span><T> { |
| <span class="kw">if let </span><span class="prelude-val">Err</span>(e) = result { |
| <span class="kw">if </span>e.kind == from { |
| <span class="prelude-val">Err</span>(ast::Error { kind: to, pattern: e.pattern, span: e.span }) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(e) |
| } |
| } <span class="kw">else </span>{ |
| result |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span>core::ops::Range; |
| |
| <span class="kw">use </span>alloc::format; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::ast::{<span class="self">self</span>, Ast, Position, Span}; |
| |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="comment">// Our own assert_eq, which has slightly better formatting (but honestly |
| // still kind of crappy). |
| </span><span class="macro">macro_rules! </span>assert_eq { |
| (<span class="macro-nonterminal">$left</span>:expr, <span class="macro-nonterminal">$right</span>:expr) => {{ |
| <span class="kw">match </span>(<span class="kw-2">&</span><span class="macro-nonterminal">$left</span>, <span class="kw-2">&</span><span class="macro-nonterminal">$right</span>) { |
| (left_val, right_val) => { |
| <span class="kw">if </span>!(<span class="kw-2">*</span>left_val == <span class="kw-2">*</span>right_val) { |
| <span class="macro">panic!</span>( |
| <span class="string">"assertion failed: `(left == right)`\n\n\ |
| left: `{:?}`\nright: `{:?}`\n\n"</span>, |
| left_val, right_val |
| ) |
| } |
| } |
| } |
| }}; |
| } |
| |
| <span class="comment">// We create these errors to compare with real ast::Errors in the tests. |
| // We define equality between TestError and ast::Error to disregard the |
| // pattern string in ast::Error, which is annoying to provide in tests. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">struct </span>TestError { |
| span: Span, |
| kind: ast::ErrorKind, |
| } |
| |
| <span class="kw">impl </span>PartialEq<ast::Error> <span class="kw">for </span>TestError { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>ast::Error) -> bool { |
| <span class="self">self</span>.span == other.span && <span class="self">self</span>.kind == other.kind |
| } |
| } |
| |
| <span class="kw">impl </span>PartialEq<TestError> <span class="kw">for </span>ast::Error { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>TestError) -> bool { |
| <span class="self">self</span>.span == other.span && <span class="self">self</span>.kind == other.kind |
| } |
| } |
| |
| <span class="kw">fn </span>s(str: <span class="kw-2">&</span>str) -> String { |
| str.to_string() |
| } |
| |
| <span class="kw">fn </span>parser(pattern: <span class="kw-2">&</span>str) -> ParserI<<span class="lifetime">'_</span>, Parser> { |
| ParserI::new(Parser::new(), pattern) |
| } |
| |
| <span class="kw">fn </span>parser_octal(pattern: <span class="kw-2">&</span>str) -> ParserI<<span class="lifetime">'_</span>, Parser> { |
| <span class="kw">let </span>parser = ParserBuilder::new().octal(<span class="bool-val">true</span>).build(); |
| ParserI::new(parser, pattern) |
| } |
| |
| <span class="kw">fn </span>parser_nest_limit( |
| pattern: <span class="kw-2">&</span>str, |
| nest_limit: u32, |
| ) -> ParserI<<span class="lifetime">'_</span>, Parser> { |
| <span class="kw">let </span>p = ParserBuilder::new().nest_limit(nest_limit).build(); |
| ParserI::new(p, pattern) |
| } |
| |
| <span class="kw">fn </span>parser_ignore_whitespace(pattern: <span class="kw-2">&</span>str) -> ParserI<<span class="lifetime">'_</span>, Parser> { |
| <span class="kw">let </span>p = ParserBuilder::new().ignore_whitespace(<span class="bool-val">true</span>).build(); |
| ParserI::new(p, pattern) |
| } |
| |
| <span class="doccomment">/// Short alias for creating a new span. |
| </span><span class="kw">fn </span>nspan(start: Position, end: Position) -> Span { |
| Span::new(start, end) |
| } |
| |
| <span class="doccomment">/// Short alias for creating a new position. |
| </span><span class="kw">fn </span>npos(offset: usize, line: usize, column: usize) -> Position { |
| Position::new(offset, line, column) |
| } |
| |
| <span class="doccomment">/// Create a new span from the given offset range. This assumes a single |
| /// line and sets the columns based on the offsets. i.e., This only works |
| /// out of the box for ASCII, which is fine for most tests. |
| </span><span class="kw">fn </span>span(range: Range<usize>) -> Span { |
| <span class="kw">let </span>start = Position::new(range.start, <span class="number">1</span>, range.start + <span class="number">1</span>); |
| <span class="kw">let </span>end = Position::new(range.end, <span class="number">1</span>, range.end + <span class="number">1</span>); |
| Span::new(start, end) |
| } |
| |
| <span class="doccomment">/// Create a new span for the corresponding byte range in the given string. |
| </span><span class="kw">fn </span>span_range(subject: <span class="kw-2">&</span>str, range: Range<usize>) -> Span { |
| <span class="kw">let </span>start = Position { |
| offset: range.start, |
| line: <span class="number">1 </span>+ subject[..range.start].matches(<span class="string">'\n'</span>).count(), |
| column: <span class="number">1 </span>+ subject[..range.start] |
| .chars() |
| .rev() |
| .position(|c| c == <span class="string">'\n'</span>) |
| .unwrap_or(subject[..range.start].chars().count()), |
| }; |
| <span class="kw">let </span>end = Position { |
| offset: range.end, |
| line: <span class="number">1 </span>+ subject[..range.end].matches(<span class="string">'\n'</span>).count(), |
| column: <span class="number">1 </span>+ subject[..range.end] |
| .chars() |
| .rev() |
| .position(|c| c == <span class="string">'\n'</span>) |
| .unwrap_or(subject[..range.end].chars().count()), |
| }; |
| Span::new(start, end) |
| } |
| |
| <span class="doccomment">/// Create a verbatim literal starting at the given position. |
| </span><span class="kw">fn </span>lit(c: char, start: usize) -> Ast { |
| lit_with(c, span(start..start + c.len_utf8())) |
| } |
| |
| <span class="doccomment">/// Create a meta literal starting at the given position. |
| </span><span class="kw">fn </span>meta_lit(c: char, span: Span) -> Ast { |
| Ast::Literal(ast::Literal { span, kind: ast::LiteralKind::Meta, c }) |
| } |
| |
| <span class="doccomment">/// Create a verbatim literal with the given span. |
| </span><span class="kw">fn </span>lit_with(c: char, span: Span) -> Ast { |
| Ast::Literal(ast::Literal { |
| span, |
| kind: ast::LiteralKind::Verbatim, |
| c, |
| }) |
| } |
| |
| <span class="doccomment">/// Create a concatenation with the given range. |
| </span><span class="kw">fn </span>concat(range: Range<usize>, asts: Vec<Ast>) -> Ast { |
| concat_with(span(range), asts) |
| } |
| |
| <span class="doccomment">/// Create a concatenation with the given span. |
| </span><span class="kw">fn </span>concat_with(span: Span, asts: Vec<Ast>) -> Ast { |
| Ast::Concat(ast::Concat { span, asts }) |
| } |
| |
| <span class="doccomment">/// Create an alternation with the given span. |
| </span><span class="kw">fn </span>alt(range: Range<usize>, asts: Vec<Ast>) -> Ast { |
| Ast::Alternation(ast::Alternation { span: span(range), asts }) |
| } |
| |
| <span class="doccomment">/// Create a capturing group with the given span. |
| </span><span class="kw">fn </span>group(range: Range<usize>, index: u32, ast: Ast) -> Ast { |
| Ast::Group(ast::Group { |
| span: span(range), |
| kind: ast::GroupKind::CaptureIndex(index), |
| ast: Box::new(ast), |
| }) |
| } |
| |
| <span class="doccomment">/// Create an ast::SetFlags. |
| /// |
| /// The given pattern should be the full pattern string. The range given |
| /// should correspond to the byte offsets where the flag set occurs. |
| /// |
| /// If negated is true, then the set is interpreted as beginning with a |
| /// negation. |
| </span><span class="kw">fn </span>flag_set( |
| pat: <span class="kw-2">&</span>str, |
| range: Range<usize>, |
| flag: ast::Flag, |
| negated: bool, |
| ) -> Ast { |
| <span class="kw">let </span><span class="kw-2">mut </span>items = <span class="macro">vec!</span>[ast::FlagsItem { |
| span: span_range(pat, (range.end - <span class="number">2</span>)..(range.end - <span class="number">1</span>)), |
| kind: ast::FlagsItemKind::Flag(flag), |
| }]; |
| <span class="kw">if </span>negated { |
| items.insert( |
| <span class="number">0</span>, |
| ast::FlagsItem { |
| span: span_range(pat, (range.start + <span class="number">2</span>)..(range.end - <span class="number">2</span>)), |
| kind: ast::FlagsItemKind::Negation, |
| }, |
| ); |
| } |
| Ast::Flags(ast::SetFlags { |
| span: span_range(pat, range.clone()), |
| flags: ast::Flags { |
| span: span_range(pat, (range.start + <span class="number">2</span>)..(range.end - <span class="number">1</span>)), |
| items, |
| }, |
| }) |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_nest_limit() { |
| <span class="comment">// A nest limit of 0 still allows some types of regexes. |
| </span><span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">""</span>, <span class="number">0</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Empty(span(<span class="number">0</span>..<span class="number">0</span>))) |
| ); |
| <span class="macro">assert_eq!</span>(parser_nest_limit(<span class="string">"a"</span>, <span class="number">0</span>).parse(), <span class="prelude-val">Ok</span>(lit(<span class="string">'a'</span>, <span class="number">0</span>))); |
| |
| <span class="comment">// Test repetition operations, which require one level of nesting. |
| </span><span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"a+"</span>, <span class="number">0</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::NestLimitExceeded(<span class="number">0</span>), |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"a+"</span>, <span class="number">1</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::RepetitionKind::OneOrMore, |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"(a)+"</span>, <span class="number">1</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::NestLimitExceeded(<span class="number">1</span>), |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"a+*"</span>, <span class="number">1</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::NestLimitExceeded(<span class="number">1</span>), |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"a+*"</span>, <span class="number">2</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::RepetitionKind::ZeroOrMore, |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::RepetitionKind::OneOrMore, |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })), |
| })) |
| ); |
| |
| <span class="comment">// Test concatenations. A concatenation requires one level of nesting. |
| </span><span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"ab"</span>, <span class="number">0</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::NestLimitExceeded(<span class="number">0</span>), |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"ab"</span>, <span class="number">1</span>).parse(), |
| <span class="prelude-val">Ok</span>(concat(<span class="number">0</span>..<span class="number">2</span>, <span class="macro">vec!</span>[lit(<span class="string">'a'</span>, <span class="number">0</span>), lit(<span class="string">'b'</span>, <span class="number">1</span>)])) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"abc"</span>, <span class="number">1</span>).parse(), |
| <span class="prelude-val">Ok</span>(concat(<span class="number">0</span>..<span class="number">3</span>, <span class="macro">vec!</span>[lit(<span class="string">'a'</span>, <span class="number">0</span>), lit(<span class="string">'b'</span>, <span class="number">1</span>), lit(<span class="string">'c'</span>, <span class="number">2</span>)])) |
| ); |
| |
| <span class="comment">// Test alternations. An alternation requires one level of nesting. |
| </span><span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"a|b"</span>, <span class="number">0</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::NestLimitExceeded(<span class="number">0</span>), |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"a|b"</span>, <span class="number">1</span>).parse(), |
| <span class="prelude-val">Ok</span>(alt(<span class="number">0</span>..<span class="number">3</span>, <span class="macro">vec!</span>[lit(<span class="string">'a'</span>, <span class="number">0</span>), lit(<span class="string">'b'</span>, <span class="number">2</span>)])) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"a|b|c"</span>, <span class="number">1</span>).parse(), |
| <span class="prelude-val">Ok</span>(alt(<span class="number">0</span>..<span class="number">5</span>, <span class="macro">vec!</span>[lit(<span class="string">'a'</span>, <span class="number">0</span>), lit(<span class="string">'b'</span>, <span class="number">2</span>), lit(<span class="string">'c'</span>, <span class="number">4</span>)])) |
| ); |
| |
| <span class="comment">// Test character classes. Classes form their own mini-recursive |
| // syntax! |
| </span><span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"[a]"</span>, <span class="number">0</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::NestLimitExceeded(<span class="number">0</span>), |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"[a]"</span>, <span class="number">1</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassSet::Item(ast::ClassSetItem::Literal( |
| ast::Literal { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'a'</span>, |
| } |
| )), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"[ab]"</span>, <span class="number">1</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::NestLimitExceeded(<span class="number">1</span>), |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"[ab[cd]]"</span>, <span class="number">2</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">7</span>), |
| kind: ast::ErrorKind::NestLimitExceeded(<span class="number">2</span>), |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"[ab[cd]]"</span>, <span class="number">3</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">6</span>), |
| kind: ast::ErrorKind::NestLimitExceeded(<span class="number">3</span>), |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"[a--b]"</span>, <span class="number">1</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">5</span>), |
| kind: ast::ErrorKind::NestLimitExceeded(<span class="number">1</span>), |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_nest_limit(<span class="string">"[a--bc]"</span>, <span class="number">2</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">6</span>), |
| kind: ast::ErrorKind::NestLimitExceeded(<span class="number">2</span>), |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_comments() { |
| <span class="kw">let </span>pat = <span class="string">"(?x) |
| # This is comment 1. |
| foo # This is comment 2. |
| # This is comment 3. |
| bar |
| # This is comment 4."</span>; |
| <span class="kw">let </span>astc = parser(pat).parse_with_comments().unwrap(); |
| <span class="macro">assert_eq!</span>( |
| astc.ast, |
| concat_with( |
| span_range(pat, <span class="number">0</span>..pat.len()), |
| <span class="macro">vec!</span>[ |
| flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>), |
| lit_with(<span class="string">'f'</span>, span_range(pat, <span class="number">26</span>..<span class="number">27</span>)), |
| lit_with(<span class="string">'o'</span>, span_range(pat, <span class="number">27</span>..<span class="number">28</span>)), |
| lit_with(<span class="string">'o'</span>, span_range(pat, <span class="number">28</span>..<span class="number">29</span>)), |
| lit_with(<span class="string">'b'</span>, span_range(pat, <span class="number">74</span>..<span class="number">75</span>)), |
| lit_with(<span class="string">'a'</span>, span_range(pat, <span class="number">75</span>..<span class="number">76</span>)), |
| lit_with(<span class="string">'r'</span>, span_range(pat, <span class="number">76</span>..<span class="number">77</span>)), |
| ] |
| ) |
| ); |
| <span class="macro">assert_eq!</span>( |
| astc.comments, |
| <span class="macro">vec!</span>[ |
| ast::Comment { |
| span: span_range(pat, <span class="number">5</span>..<span class="number">26</span>), |
| comment: s(<span class="string">" This is comment 1."</span>), |
| }, |
| ast::Comment { |
| span: span_range(pat, <span class="number">30</span>..<span class="number">51</span>), |
| comment: s(<span class="string">" This is comment 2."</span>), |
| }, |
| ast::Comment { |
| span: span_range(pat, <span class="number">53</span>..<span class="number">74</span>), |
| comment: s(<span class="string">" This is comment 3."</span>), |
| }, |
| ast::Comment { |
| span: span_range(pat, <span class="number">78</span>..<span class="number">98</span>), |
| comment: s(<span class="string">" This is comment 4."</span>), |
| }, |
| ] |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_holistic() { |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"]"</span>).parse(), <span class="prelude-val">Ok</span>(lit(<span class="string">']'</span>, <span class="number">0</span>))); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\\\.\+\*\?\(\)\|\[\]\{\}\^\$\#\&\-\~"</span>).parse(), |
| <span class="prelude-val">Ok</span>(concat( |
| <span class="number">0</span>..<span class="number">36</span>, |
| <span class="macro">vec!</span>[ |
| meta_lit(<span class="string">'\\'</span>, span(<span class="number">0</span>..<span class="number">2</span>)), |
| meta_lit(<span class="string">'.'</span>, span(<span class="number">2</span>..<span class="number">4</span>)), |
| meta_lit(<span class="string">'+'</span>, span(<span class="number">4</span>..<span class="number">6</span>)), |
| meta_lit(<span class="string">'*'</span>, span(<span class="number">6</span>..<span class="number">8</span>)), |
| meta_lit(<span class="string">'?'</span>, span(<span class="number">8</span>..<span class="number">10</span>)), |
| meta_lit(<span class="string">'('</span>, span(<span class="number">10</span>..<span class="number">12</span>)), |
| meta_lit(<span class="string">')'</span>, span(<span class="number">12</span>..<span class="number">14</span>)), |
| meta_lit(<span class="string">'|'</span>, span(<span class="number">14</span>..<span class="number">16</span>)), |
| meta_lit(<span class="string">'['</span>, span(<span class="number">16</span>..<span class="number">18</span>)), |
| meta_lit(<span class="string">']'</span>, span(<span class="number">18</span>..<span class="number">20</span>)), |
| meta_lit(<span class="string">'{'</span>, span(<span class="number">20</span>..<span class="number">22</span>)), |
| meta_lit(<span class="string">'}'</span>, span(<span class="number">22</span>..<span class="number">24</span>)), |
| meta_lit(<span class="string">'^'</span>, span(<span class="number">24</span>..<span class="number">26</span>)), |
| meta_lit(<span class="string">'$'</span>, span(<span class="number">26</span>..<span class="number">28</span>)), |
| meta_lit(<span class="string">'#'</span>, span(<span class="number">28</span>..<span class="number">30</span>)), |
| meta_lit(<span class="string">'&'</span>, span(<span class="number">30</span>..<span class="number">32</span>)), |
| meta_lit(<span class="string">'-'</span>, span(<span class="number">32</span>..<span class="number">34</span>)), |
| meta_lit(<span class="string">'~'</span>, span(<span class="number">34</span>..<span class="number">36</span>)), |
| ] |
| )) |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_ignore_whitespace() { |
| <span class="comment">// Test that basic whitespace insensitivity works. |
| </span><span class="kw">let </span>pat = <span class="string">"(?x)a b"</span>; |
| <span class="macro">assert_eq!</span>( |
| parser(pat).parse(), |
| <span class="prelude-val">Ok</span>(concat_with( |
| nspan(npos(<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>), npos(<span class="number">7</span>, <span class="number">1</span>, <span class="number">8</span>)), |
| <span class="macro">vec!</span>[ |
| flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>), |
| lit_with(<span class="string">'a'</span>, nspan(npos(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>), npos(<span class="number">5</span>, <span class="number">1</span>, <span class="number">6</span>))), |
| lit_with(<span class="string">'b'</span>, nspan(npos(<span class="number">6</span>, <span class="number">1</span>, <span class="number">7</span>), npos(<span class="number">7</span>, <span class="number">1</span>, <span class="number">8</span>))), |
| ] |
| )) |
| ); |
| |
| <span class="comment">// Test that we can toggle whitespace insensitivity. |
| </span><span class="kw">let </span>pat = <span class="string">"(?x)a b(?-x)a b"</span>; |
| <span class="macro">assert_eq!</span>( |
| parser(pat).parse(), |
| <span class="prelude-val">Ok</span>(concat_with( |
| nspan(npos(<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>), npos(<span class="number">15</span>, <span class="number">1</span>, <span class="number">16</span>)), |
| <span class="macro">vec!</span>[ |
| flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>), |
| lit_with(<span class="string">'a'</span>, nspan(npos(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>), npos(<span class="number">5</span>, <span class="number">1</span>, <span class="number">6</span>))), |
| lit_with(<span class="string">'b'</span>, nspan(npos(<span class="number">6</span>, <span class="number">1</span>, <span class="number">7</span>), npos(<span class="number">7</span>, <span class="number">1</span>, <span class="number">8</span>))), |
| flag_set(pat, <span class="number">7</span>..<span class="number">12</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">true</span>), |
| lit_with(<span class="string">'a'</span>, nspan(npos(<span class="number">12</span>, <span class="number">1</span>, <span class="number">13</span>), npos(<span class="number">13</span>, <span class="number">1</span>, <span class="number">14</span>))), |
| lit_with(<span class="string">' '</span>, nspan(npos(<span class="number">13</span>, <span class="number">1</span>, <span class="number">14</span>), npos(<span class="number">14</span>, <span class="number">1</span>, <span class="number">15</span>))), |
| lit_with(<span class="string">'b'</span>, nspan(npos(<span class="number">14</span>, <span class="number">1</span>, <span class="number">15</span>), npos(<span class="number">15</span>, <span class="number">1</span>, <span class="number">16</span>))), |
| ] |
| )) |
| ); |
| |
| <span class="comment">// Test that nesting whitespace insensitive flags works. |
| </span><span class="kw">let </span>pat = <span class="string">"a (?x:a )a "</span>; |
| <span class="macro">assert_eq!</span>( |
| parser(pat).parse(), |
| <span class="prelude-val">Ok</span>(concat_with( |
| span_range(pat, <span class="number">0</span>..<span class="number">11</span>), |
| <span class="macro">vec!</span>[ |
| lit_with(<span class="string">'a'</span>, span_range(pat, <span class="number">0</span>..<span class="number">1</span>)), |
| lit_with(<span class="string">' '</span>, span_range(pat, <span class="number">1</span>..<span class="number">2</span>)), |
| Ast::Group(ast::Group { |
| span: span_range(pat, <span class="number">2</span>..<span class="number">9</span>), |
| kind: ast::GroupKind::NonCapturing(ast::Flags { |
| span: span_range(pat, <span class="number">4</span>..<span class="number">5</span>), |
| items: <span class="macro">vec!</span>[ast::FlagsItem { |
| span: span_range(pat, <span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::IgnoreWhitespace |
| ), |
| },], |
| }), |
| ast: Box::new(lit_with(<span class="string">'a'</span>, span_range(pat, <span class="number">6</span>..<span class="number">7</span>))), |
| }), |
| lit_with(<span class="string">'a'</span>, span_range(pat, <span class="number">9</span>..<span class="number">10</span>)), |
| lit_with(<span class="string">' '</span>, span_range(pat, <span class="number">10</span>..<span class="number">11</span>)), |
| ] |
| )) |
| ); |
| |
| <span class="comment">// Test that whitespace after an opening paren is insignificant. |
| </span><span class="kw">let </span>pat = <span class="string">"(?x)( ?P<foo> a )"</span>; |
| <span class="macro">assert_eq!</span>( |
| parser(pat).parse(), |
| <span class="prelude-val">Ok</span>(concat_with( |
| span_range(pat, <span class="number">0</span>..pat.len()), |
| <span class="macro">vec!</span>[ |
| flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>), |
| Ast::Group(ast::Group { |
| span: span_range(pat, <span class="number">4</span>..pat.len()), |
| kind: ast::GroupKind::CaptureName { |
| starts_with_p: <span class="bool-val">true</span>, |
| name: ast::CaptureName { |
| span: span_range(pat, <span class="number">9</span>..<span class="number">12</span>), |
| name: s(<span class="string">"foo"</span>), |
| index: <span class="number">1</span>, |
| } |
| }, |
| ast: Box::new(lit_with(<span class="string">'a'</span>, span_range(pat, <span class="number">14</span>..<span class="number">15</span>))), |
| }), |
| ] |
| )) |
| ); |
| <span class="kw">let </span>pat = <span class="string">"(?x)( a )"</span>; |
| <span class="macro">assert_eq!</span>( |
| parser(pat).parse(), |
| <span class="prelude-val">Ok</span>(concat_with( |
| span_range(pat, <span class="number">0</span>..pat.len()), |
| <span class="macro">vec!</span>[ |
| flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>), |
| Ast::Group(ast::Group { |
| span: span_range(pat, <span class="number">4</span>..pat.len()), |
| kind: ast::GroupKind::CaptureIndex(<span class="number">1</span>), |
| ast: Box::new(lit_with(<span class="string">'a'</span>, span_range(pat, <span class="number">7</span>..<span class="number">8</span>))), |
| }), |
| ] |
| )) |
| ); |
| <span class="kw">let </span>pat = <span class="string">"(?x)( ?: a )"</span>; |
| <span class="macro">assert_eq!</span>( |
| parser(pat).parse(), |
| <span class="prelude-val">Ok</span>(concat_with( |
| span_range(pat, <span class="number">0</span>..pat.len()), |
| <span class="macro">vec!</span>[ |
| flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>), |
| Ast::Group(ast::Group { |
| span: span_range(pat, <span class="number">4</span>..pat.len()), |
| kind: ast::GroupKind::NonCapturing(ast::Flags { |
| span: span_range(pat, <span class="number">8</span>..<span class="number">8</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| ast: Box::new(lit_with(<span class="string">'a'</span>, span_range(pat, <span class="number">11</span>..<span class="number">12</span>))), |
| }), |
| ] |
| )) |
| ); |
| <span class="kw">let </span>pat = <span class="string">r"(?x)\x { 53 }"</span>; |
| <span class="macro">assert_eq!</span>( |
| parser(pat).parse(), |
| <span class="prelude-val">Ok</span>(concat_with( |
| span_range(pat, <span class="number">0</span>..pat.len()), |
| <span class="macro">vec!</span>[ |
| flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>), |
| Ast::Literal(ast::Literal { |
| span: span(<span class="number">4</span>..<span class="number">13</span>), |
| kind: ast::LiteralKind::HexBrace( |
| ast::HexLiteralKind::X |
| ), |
| c: <span class="string">'S'</span>, |
| }), |
| ] |
| )) |
| ); |
| |
| <span class="comment">// Test that whitespace after an escape is OK. |
| </span><span class="kw">let </span>pat = <span class="string">r"(?x)\ "</span>; |
| <span class="macro">assert_eq!</span>( |
| parser(pat).parse(), |
| <span class="prelude-val">Ok</span>(concat_with( |
| span_range(pat, <span class="number">0</span>..pat.len()), |
| <span class="macro">vec!</span>[ |
| flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>), |
| Ast::Literal(ast::Literal { |
| span: span_range(pat, <span class="number">4</span>..<span class="number">6</span>), |
| kind: ast::LiteralKind::Superfluous, |
| c: <span class="string">' '</span>, |
| }), |
| ] |
| )) |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_newlines() { |
| <span class="kw">let </span>pat = <span class="string">".\n."</span>; |
| <span class="macro">assert_eq!</span>( |
| parser(pat).parse(), |
| <span class="prelude-val">Ok</span>(concat_with( |
| span_range(pat, <span class="number">0</span>..<span class="number">3</span>), |
| <span class="macro">vec!</span>[ |
| Ast::Dot(span_range(pat, <span class="number">0</span>..<span class="number">1</span>)), |
| lit_with(<span class="string">'\n'</span>, span_range(pat, <span class="number">1</span>..<span class="number">2</span>)), |
| Ast::Dot(span_range(pat, <span class="number">2</span>..<span class="number">3</span>)), |
| ] |
| )) |
| ); |
| |
| <span class="kw">let </span>pat = <span class="string">"foobar\nbaz\nquux\n"</span>; |
| <span class="macro">assert_eq!</span>( |
| parser(pat).parse(), |
| <span class="prelude-val">Ok</span>(concat_with( |
| span_range(pat, <span class="number">0</span>..pat.len()), |
| <span class="macro">vec!</span>[ |
| lit_with(<span class="string">'f'</span>, nspan(npos(<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>), npos(<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>))), |
| lit_with(<span class="string">'o'</span>, nspan(npos(<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>), npos(<span class="number">2</span>, <span class="number">1</span>, <span class="number">3</span>))), |
| lit_with(<span class="string">'o'</span>, nspan(npos(<span class="number">2</span>, <span class="number">1</span>, <span class="number">3</span>), npos(<span class="number">3</span>, <span class="number">1</span>, <span class="number">4</span>))), |
| lit_with(<span class="string">'b'</span>, nspan(npos(<span class="number">3</span>, <span class="number">1</span>, <span class="number">4</span>), npos(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>))), |
| lit_with(<span class="string">'a'</span>, nspan(npos(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>), npos(<span class="number">5</span>, <span class="number">1</span>, <span class="number">6</span>))), |
| lit_with(<span class="string">'r'</span>, nspan(npos(<span class="number">5</span>, <span class="number">1</span>, <span class="number">6</span>), npos(<span class="number">6</span>, <span class="number">1</span>, <span class="number">7</span>))), |
| lit_with(<span class="string">'\n'</span>, nspan(npos(<span class="number">6</span>, <span class="number">1</span>, <span class="number">7</span>), npos(<span class="number">7</span>, <span class="number">2</span>, <span class="number">1</span>))), |
| lit_with(<span class="string">'b'</span>, nspan(npos(<span class="number">7</span>, <span class="number">2</span>, <span class="number">1</span>), npos(<span class="number">8</span>, <span class="number">2</span>, <span class="number">2</span>))), |
| lit_with(<span class="string">'a'</span>, nspan(npos(<span class="number">8</span>, <span class="number">2</span>, <span class="number">2</span>), npos(<span class="number">9</span>, <span class="number">2</span>, <span class="number">3</span>))), |
| lit_with(<span class="string">'z'</span>, nspan(npos(<span class="number">9</span>, <span class="number">2</span>, <span class="number">3</span>), npos(<span class="number">10</span>, <span class="number">2</span>, <span class="number">4</span>))), |
| lit_with(<span class="string">'\n'</span>, nspan(npos(<span class="number">10</span>, <span class="number">2</span>, <span class="number">4</span>), npos(<span class="number">11</span>, <span class="number">3</span>, <span class="number">1</span>))), |
| lit_with(<span class="string">'q'</span>, nspan(npos(<span class="number">11</span>, <span class="number">3</span>, <span class="number">1</span>), npos(<span class="number">12</span>, <span class="number">3</span>, <span class="number">2</span>))), |
| lit_with(<span class="string">'u'</span>, nspan(npos(<span class="number">12</span>, <span class="number">3</span>, <span class="number">2</span>), npos(<span class="number">13</span>, <span class="number">3</span>, <span class="number">3</span>))), |
| lit_with(<span class="string">'u'</span>, nspan(npos(<span class="number">13</span>, <span class="number">3</span>, <span class="number">3</span>), npos(<span class="number">14</span>, <span class="number">3</span>, <span class="number">4</span>))), |
| lit_with(<span class="string">'x'</span>, nspan(npos(<span class="number">14</span>, <span class="number">3</span>, <span class="number">4</span>), npos(<span class="number">15</span>, <span class="number">3</span>, <span class="number">5</span>))), |
| lit_with(<span class="string">'\n'</span>, nspan(npos(<span class="number">15</span>, <span class="number">3</span>, <span class="number">5</span>), npos(<span class="number">16</span>, <span class="number">4</span>, <span class="number">1</span>))), |
| ] |
| )) |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_uncounted_repetition() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a*"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::RepetitionKind::ZeroOrMore, |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a+"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::RepetitionKind::OneOrMore, |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a?"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::RepetitionKind::ZeroOrOne, |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a??"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| kind: ast::RepetitionKind::ZeroOrOne, |
| }, |
| greedy: <span class="bool-val">false</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a?"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::RepetitionKind::ZeroOrOne, |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a?b"</span>).parse(), |
| <span class="prelude-val">Ok</span>(concat( |
| <span class="number">0</span>..<span class="number">3</span>, |
| <span class="macro">vec!</span>[ |
| Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::RepetitionKind::ZeroOrOne, |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| }), |
| lit(<span class="string">'b'</span>, <span class="number">2</span>), |
| ] |
| )) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a??b"</span>).parse(), |
| <span class="prelude-val">Ok</span>(concat( |
| <span class="number">0</span>..<span class="number">4</span>, |
| <span class="macro">vec!</span>[ |
| Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| kind: ast::RepetitionKind::ZeroOrOne, |
| }, |
| greedy: <span class="bool-val">false</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| }), |
| lit(<span class="string">'b'</span>, <span class="number">3</span>), |
| ] |
| )) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"ab?"</span>).parse(), |
| <span class="prelude-val">Ok</span>(concat( |
| <span class="number">0</span>..<span class="number">3</span>, |
| <span class="macro">vec!</span>[ |
| lit(<span class="string">'a'</span>, <span class="number">0</span>), |
| Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::RepetitionKind::ZeroOrOne, |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'b'</span>, <span class="number">1</span>)), |
| }), |
| ] |
| )) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(ab)?"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::RepetitionKind::ZeroOrOne, |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(group( |
| <span class="number">0</span>..<span class="number">4</span>, |
| <span class="number">1</span>, |
| concat(<span class="number">1</span>..<span class="number">3</span>, <span class="macro">vec!</span>[lit(<span class="string">'a'</span>, <span class="number">1</span>), lit(<span class="string">'b'</span>, <span class="number">2</span>),]) |
| )), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"|a?"</span>).parse(), |
| <span class="prelude-val">Ok</span>(alt( |
| <span class="number">0</span>..<span class="number">3</span>, |
| <span class="macro">vec!</span>[ |
| Ast::Empty(span(<span class="number">0</span>..<span class="number">0</span>)), |
| Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::RepetitionKind::ZeroOrOne, |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">1</span>)), |
| }), |
| ] |
| )) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"*"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">0</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(?i)*"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(*)"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(?:?)"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"+"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">0</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"?"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">0</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(?)"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"|*"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"|+"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"|?"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_counted_repetition() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{5}"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">4</span>), |
| kind: ast::RepetitionKind::Range( |
| ast::RepetitionRange::Exactly(<span class="number">5</span>) |
| ), |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{5,}"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">5</span>), |
| kind: ast::RepetitionKind::Range( |
| ast::RepetitionRange::AtLeast(<span class="number">5</span>) |
| ), |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{5,9}"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">6</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">6</span>), |
| kind: ast::RepetitionKind::Range( |
| ast::RepetitionRange::Bounded(<span class="number">5</span>, <span class="number">9</span>) |
| ), |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{5}?"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">5</span>), |
| kind: ast::RepetitionKind::Range( |
| ast::RepetitionRange::Exactly(<span class="number">5</span>) |
| ), |
| }, |
| greedy: <span class="bool-val">false</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"ab{5}"</span>).parse(), |
| <span class="prelude-val">Ok</span>(concat( |
| <span class="number">0</span>..<span class="number">5</span>, |
| <span class="macro">vec!</span>[ |
| lit(<span class="string">'a'</span>, <span class="number">0</span>), |
| Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">1</span>..<span class="number">5</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">2</span>..<span class="number">5</span>), |
| kind: ast::RepetitionKind::Range( |
| ast::RepetitionRange::Exactly(<span class="number">5</span>) |
| ), |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'b'</span>, <span class="number">1</span>)), |
| }), |
| ] |
| )) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"ab{5}c"</span>).parse(), |
| <span class="prelude-val">Ok</span>(concat( |
| <span class="number">0</span>..<span class="number">6</span>, |
| <span class="macro">vec!</span>[ |
| lit(<span class="string">'a'</span>, <span class="number">0</span>), |
| Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">1</span>..<span class="number">5</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">2</span>..<span class="number">5</span>), |
| kind: ast::RepetitionKind::Range( |
| ast::RepetitionRange::Exactly(<span class="number">5</span>) |
| ), |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'b'</span>, <span class="number">1</span>)), |
| }), |
| lit(<span class="string">'c'</span>, <span class="number">5</span>), |
| ] |
| )) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{ 5 }"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">6</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">6</span>), |
| kind: ast::RepetitionKind::Range( |
| ast::RepetitionRange::Exactly(<span class="number">5</span>) |
| ), |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{ 5 , 9 }"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">10</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">10</span>), |
| kind: ast::RepetitionKind::Range( |
| ast::RepetitionRange::Bounded(<span class="number">5</span>, <span class="number">9</span>) |
| ), |
| }, |
| greedy: <span class="bool-val">true</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_ignore_whitespace(<span class="string">r"a{5,9} ?"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition { |
| span: span(<span class="number">0</span>..<span class="number">8</span>), |
| op: ast::RepetitionOp { |
| span: span(<span class="number">1</span>..<span class="number">8</span>), |
| kind: ast::RepetitionKind::Range( |
| ast::RepetitionRange::Bounded(<span class="number">5</span>, <span class="number">9</span>) |
| ), |
| }, |
| greedy: <span class="bool-val">false</span>, |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">0</span>)), |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(?i){0}"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(?m){1,1}"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{]}"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::RepetitionCountDecimalEmpty, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{1,]}"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::RepetitionCountDecimalEmpty, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::RepetitionCountUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{}"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::RepetitionCountDecimalEmpty, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{a"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::RepetitionCountDecimalEmpty, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{9999999999}"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">12</span>), |
| kind: ast::ErrorKind::DecimalInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{9"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::RepetitionCountUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{9,a"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::RepetitionCountDecimalEmpty, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{9,9999999999}"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">14</span>), |
| kind: ast::ErrorKind::DecimalInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{9,"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::RepetitionCountUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{9,11"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">6</span>), |
| kind: ast::ErrorKind::RepetitionCountUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a{2,1}"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">6</span>), |
| kind: ast::ErrorKind::RepetitionCountInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"{5}"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">0</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"|{5}"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::RepetitionMissing, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_alternate() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a|b"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Alternation(ast::Alternation { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| asts: <span class="macro">vec!</span>[lit(<span class="string">'a'</span>, <span class="number">0</span>), lit(<span class="string">'b'</span>, <span class="number">2</span>)], |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(a|b)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(group( |
| <span class="number">0</span>..<span class="number">5</span>, |
| <span class="number">1</span>, |
| Ast::Alternation(ast::Alternation { |
| span: span(<span class="number">1</span>..<span class="number">4</span>), |
| asts: <span class="macro">vec!</span>[lit(<span class="string">'a'</span>, <span class="number">1</span>), lit(<span class="string">'b'</span>, <span class="number">3</span>)], |
| }) |
| )) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a|b|c"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Alternation(ast::Alternation { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| asts: <span class="macro">vec!</span>[lit(<span class="string">'a'</span>, <span class="number">0</span>), lit(<span class="string">'b'</span>, <span class="number">2</span>), lit(<span class="string">'c'</span>, <span class="number">4</span>)], |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"ax|by|cz"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Alternation(ast::Alternation { |
| span: span(<span class="number">0</span>..<span class="number">8</span>), |
| asts: <span class="macro">vec!</span>[ |
| concat(<span class="number">0</span>..<span class="number">2</span>, <span class="macro">vec!</span>[lit(<span class="string">'a'</span>, <span class="number">0</span>), lit(<span class="string">'x'</span>, <span class="number">1</span>)]), |
| concat(<span class="number">3</span>..<span class="number">5</span>, <span class="macro">vec!</span>[lit(<span class="string">'b'</span>, <span class="number">3</span>), lit(<span class="string">'y'</span>, <span class="number">4</span>)]), |
| concat(<span class="number">6</span>..<span class="number">8</span>, <span class="macro">vec!</span>[lit(<span class="string">'c'</span>, <span class="number">6</span>), lit(<span class="string">'z'</span>, <span class="number">7</span>)]), |
| ], |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(ax|by|cz)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(group( |
| <span class="number">0</span>..<span class="number">10</span>, |
| <span class="number">1</span>, |
| Ast::Alternation(ast::Alternation { |
| span: span(<span class="number">1</span>..<span class="number">9</span>), |
| asts: <span class="macro">vec!</span>[ |
| concat(<span class="number">1</span>..<span class="number">3</span>, <span class="macro">vec!</span>[lit(<span class="string">'a'</span>, <span class="number">1</span>), lit(<span class="string">'x'</span>, <span class="number">2</span>)]), |
| concat(<span class="number">4</span>..<span class="number">6</span>, <span class="macro">vec!</span>[lit(<span class="string">'b'</span>, <span class="number">4</span>), lit(<span class="string">'y'</span>, <span class="number">5</span>)]), |
| concat(<span class="number">7</span>..<span class="number">9</span>, <span class="macro">vec!</span>[lit(<span class="string">'c'</span>, <span class="number">7</span>), lit(<span class="string">'z'</span>, <span class="number">8</span>)]), |
| ], |
| }) |
| )) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(ax|(by|(cz)))"</span>).parse(), |
| <span class="prelude-val">Ok</span>(group( |
| <span class="number">0</span>..<span class="number">14</span>, |
| <span class="number">1</span>, |
| alt( |
| <span class="number">1</span>..<span class="number">13</span>, |
| <span class="macro">vec!</span>[ |
| concat(<span class="number">1</span>..<span class="number">3</span>, <span class="macro">vec!</span>[lit(<span class="string">'a'</span>, <span class="number">1</span>), lit(<span class="string">'x'</span>, <span class="number">2</span>)]), |
| group( |
| <span class="number">4</span>..<span class="number">13</span>, |
| <span class="number">2</span>, |
| alt( |
| <span class="number">5</span>..<span class="number">12</span>, |
| <span class="macro">vec!</span>[ |
| concat( |
| <span class="number">5</span>..<span class="number">7</span>, |
| <span class="macro">vec!</span>[lit(<span class="string">'b'</span>, <span class="number">5</span>), lit(<span class="string">'y'</span>, <span class="number">6</span>)] |
| ), |
| group( |
| <span class="number">8</span>..<span class="number">12</span>, |
| <span class="number">3</span>, |
| concat( |
| <span class="number">9</span>..<span class="number">11</span>, |
| <span class="macro">vec!</span>[lit(<span class="string">'c'</span>, <span class="number">9</span>), lit(<span class="string">'z'</span>, <span class="number">10</span>),] |
| ) |
| ), |
| ] |
| ) |
| ), |
| ] |
| ) |
| )) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"|"</span>).parse(), |
| <span class="prelude-val">Ok</span>(alt( |
| <span class="number">0</span>..<span class="number">1</span>, |
| <span class="macro">vec!</span>[Ast::Empty(span(<span class="number">0</span>..<span class="number">0</span>)), Ast::Empty(span(<span class="number">1</span>..<span class="number">1</span>)),] |
| )) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"||"</span>).parse(), |
| <span class="prelude-val">Ok</span>(alt( |
| <span class="number">0</span>..<span class="number">2</span>, |
| <span class="macro">vec!</span>[ |
| Ast::Empty(span(<span class="number">0</span>..<span class="number">0</span>)), |
| Ast::Empty(span(<span class="number">1</span>..<span class="number">1</span>)), |
| Ast::Empty(span(<span class="number">2</span>..<span class="number">2</span>)), |
| ] |
| )) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a|"</span>).parse(), |
| <span class="prelude-val">Ok</span>(alt(<span class="number">0</span>..<span class="number">2</span>, <span class="macro">vec!</span>[lit(<span class="string">'a'</span>, <span class="number">0</span>), Ast::Empty(span(<span class="number">2</span>..<span class="number">2</span>)),])) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"|a"</span>).parse(), |
| <span class="prelude-val">Ok</span>(alt(<span class="number">0</span>..<span class="number">2</span>, <span class="macro">vec!</span>[Ast::Empty(span(<span class="number">0</span>..<span class="number">0</span>)), lit(<span class="string">'a'</span>, <span class="number">1</span>),])) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(|)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(group( |
| <span class="number">0</span>..<span class="number">3</span>, |
| <span class="number">1</span>, |
| alt( |
| <span class="number">1</span>..<span class="number">2</span>, |
| <span class="macro">vec!</span>[Ast::Empty(span(<span class="number">1</span>..<span class="number">1</span>)), Ast::Empty(span(<span class="number">2</span>..<span class="number">2</span>)),] |
| ) |
| )) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(a|)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(group( |
| <span class="number">0</span>..<span class="number">4</span>, |
| <span class="number">1</span>, |
| alt(<span class="number">1</span>..<span class="number">3</span>, <span class="macro">vec!</span>[lit(<span class="string">'a'</span>, <span class="number">1</span>), Ast::Empty(span(<span class="number">3</span>..<span class="number">3</span>)),]) |
| )) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(|a)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(group( |
| <span class="number">0</span>..<span class="number">4</span>, |
| <span class="number">1</span>, |
| alt(<span class="number">1</span>..<span class="number">3</span>, <span class="macro">vec!</span>[Ast::Empty(span(<span class="number">1</span>..<span class="number">1</span>)), lit(<span class="string">'a'</span>, <span class="number">2</span>),]) |
| )) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a|b)"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::GroupUnopened, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(a|b"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::GroupUnclosed, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_unsupported_lookaround() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(?=a)"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::UnsupportedLookAround, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(?!a)"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::UnsupportedLookAround, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(?<=a)"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::UnsupportedLookAround, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"(?<!a)"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::UnsupportedLookAround, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_group() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?i)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Flags(ast::SetFlags { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| flags: ast::Flags { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| items: <span class="macro">vec!</span>[ast::FlagsItem { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::CaseInsensitive |
| ), |
| }], |
| }, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?iU)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Flags(ast::SetFlags { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| flags: ast::Flags { |
| span: span(<span class="number">2</span>..<span class="number">4</span>), |
| items: <span class="macro">vec!</span>[ |
| ast::FlagsItem { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::CaseInsensitive |
| ), |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::SwapGreed |
| ), |
| }, |
| ], |
| }, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?i-U)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Flags(ast::SetFlags { |
| span: span(<span class="number">0</span>..<span class="number">6</span>), |
| flags: ast::Flags { |
| span: span(<span class="number">2</span>..<span class="number">5</span>), |
| items: <span class="macro">vec!</span>[ |
| ast::FlagsItem { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::CaseInsensitive |
| ), |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::FlagsItemKind::Negation, |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::SwapGreed |
| ), |
| }, |
| ], |
| }, |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"()"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::GroupKind::CaptureIndex(<span class="number">1</span>), |
| ast: Box::new(Ast::Empty(span(<span class="number">1</span>..<span class="number">1</span>))), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(a)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| kind: ast::GroupKind::CaptureIndex(<span class="number">1</span>), |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">1</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(())"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| kind: ast::GroupKind::CaptureIndex(<span class="number">1</span>), |
| ast: Box::new(Ast::Group(ast::Group { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| kind: ast::GroupKind::CaptureIndex(<span class="number">2</span>), |
| ast: Box::new(Ast::Empty(span(<span class="number">2</span>..<span class="number">2</span>))), |
| })), |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?:a)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| kind: ast::GroupKind::NonCapturing(ast::Flags { |
| span: span(<span class="number">2</span>..<span class="number">2</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">3</span>)), |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?i:a)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: span(<span class="number">0</span>..<span class="number">6</span>), |
| kind: ast::GroupKind::NonCapturing(ast::Flags { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| items: <span class="macro">vec!</span>[ast::FlagsItem { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::CaseInsensitive |
| ), |
| },], |
| }), |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">4</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?i-U:a)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: span(<span class="number">0</span>..<span class="number">8</span>), |
| kind: ast::GroupKind::NonCapturing(ast::Flags { |
| span: span(<span class="number">2</span>..<span class="number">5</span>), |
| items: <span class="macro">vec!</span>[ |
| ast::FlagsItem { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::CaseInsensitive |
| ), |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::FlagsItemKind::Negation, |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::SwapGreed |
| ), |
| }, |
| ], |
| }), |
| ast: Box::new(lit(<span class="string">'a'</span>, <span class="number">6</span>)), |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"("</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::GroupUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::GroupUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::FlagUnrecognized, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::GroupNameUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(a"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::GroupUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(()"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::GroupUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">")"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::GroupUnopened, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"a)"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::GroupUnopened, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_capture_name() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?<a>z)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: span(<span class="number">0</span>..<span class="number">7</span>), |
| kind: ast::GroupKind::CaptureName { |
| starts_with_p: <span class="bool-val">false</span>, |
| name: ast::CaptureName { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| name: s(<span class="string">"a"</span>), |
| index: <span class="number">1</span>, |
| } |
| }, |
| ast: Box::new(lit(<span class="string">'z'</span>, <span class="number">5</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<a>z)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: span(<span class="number">0</span>..<span class="number">8</span>), |
| kind: ast::GroupKind::CaptureName { |
| starts_with_p: <span class="bool-val">true</span>, |
| name: ast::CaptureName { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| name: s(<span class="string">"a"</span>), |
| index: <span class="number">1</span>, |
| } |
| }, |
| ast: Box::new(lit(<span class="string">'z'</span>, <span class="number">6</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<abc>z)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: span(<span class="number">0</span>..<span class="number">10</span>), |
| kind: ast::GroupKind::CaptureName { |
| starts_with_p: <span class="bool-val">true</span>, |
| name: ast::CaptureName { |
| span: span(<span class="number">4</span>..<span class="number">7</span>), |
| name: s(<span class="string">"abc"</span>), |
| index: <span class="number">1</span>, |
| } |
| }, |
| ast: Box::new(lit(<span class="string">'z'</span>, <span class="number">8</span>)), |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<a_1>z)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: span(<span class="number">0</span>..<span class="number">10</span>), |
| kind: ast::GroupKind::CaptureName { |
| starts_with_p: <span class="bool-val">true</span>, |
| name: ast::CaptureName { |
| span: span(<span class="number">4</span>..<span class="number">7</span>), |
| name: s(<span class="string">"a_1"</span>), |
| index: <span class="number">1</span>, |
| } |
| }, |
| ast: Box::new(lit(<span class="string">'z'</span>, <span class="number">8</span>)), |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<a.1>z)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: span(<span class="number">0</span>..<span class="number">10</span>), |
| kind: ast::GroupKind::CaptureName { |
| starts_with_p: <span class="bool-val">true</span>, |
| name: ast::CaptureName { |
| span: span(<span class="number">4</span>..<span class="number">7</span>), |
| name: s(<span class="string">"a.1"</span>), |
| index: <span class="number">1</span>, |
| } |
| }, |
| ast: Box::new(lit(<span class="string">'z'</span>, <span class="number">8</span>)), |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<a[1]>z)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: span(<span class="number">0</span>..<span class="number">11</span>), |
| kind: ast::GroupKind::CaptureName { |
| starts_with_p: <span class="bool-val">true</span>, |
| name: ast::CaptureName { |
| span: span(<span class="number">4</span>..<span class="number">8</span>), |
| name: s(<span class="string">"a[1]"</span>), |
| index: <span class="number">1</span>, |
| } |
| }, |
| ast: Box::new(lit(<span class="string">'z'</span>, <span class="number">9</span>)), |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<a¾>)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: Span::new( |
| Position::new(<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>), |
| Position::new(<span class="number">9</span>, <span class="number">1</span>, <span class="number">9</span>), |
| ), |
| kind: ast::GroupKind::CaptureName { |
| starts_with_p: <span class="bool-val">true</span>, |
| name: ast::CaptureName { |
| span: Span::new( |
| Position::new(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>), |
| Position::new(<span class="number">7</span>, <span class="number">1</span>, <span class="number">7</span>), |
| ), |
| name: s(<span class="string">"a¾"</span>), |
| index: <span class="number">1</span>, |
| } |
| }, |
| ast: Box::new(Ast::Empty(Span::new( |
| Position::new(<span class="number">8</span>, <span class="number">1</span>, <span class="number">8</span>), |
| Position::new(<span class="number">8</span>, <span class="number">1</span>, <span class="number">8</span>), |
| ))), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<名字>)"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Group(ast::Group { |
| span: Span::new( |
| Position::new(<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>), |
| Position::new(<span class="number">12</span>, <span class="number">1</span>, <span class="number">9</span>), |
| ), |
| kind: ast::GroupKind::CaptureName { |
| starts_with_p: <span class="bool-val">true</span>, |
| name: ast::CaptureName { |
| span: Span::new( |
| Position::new(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>), |
| Position::new(<span class="number">10</span>, <span class="number">1</span>, <span class="number">7</span>), |
| ), |
| name: s(<span class="string">"名字"</span>), |
| index: <span class="number">1</span>, |
| } |
| }, |
| ast: Box::new(Ast::Empty(Span::new( |
| Position::new(<span class="number">11</span>, <span class="number">1</span>, <span class="number">8</span>), |
| Position::new(<span class="number">11</span>, <span class="number">1</span>, <span class="number">8</span>), |
| ))), |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::GroupNameUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<>z)"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::GroupNameEmpty, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<a"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">5</span>..<span class="number">5</span>), |
| kind: ast::ErrorKind::GroupNameUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<ab"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">6</span>..<span class="number">6</span>), |
| kind: ast::ErrorKind::GroupNameUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<0a"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::ErrorKind::GroupNameInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<~"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::ErrorKind::GroupNameInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<abc~"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">7</span>..<span class="number">8</span>), |
| kind: ast::ErrorKind::GroupNameInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<a>y)(?P<a>z)"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">12</span>..<span class="number">13</span>), |
| kind: ast::ErrorKind::GroupNameDuplicate { |
| original: span(<span class="number">4</span>..<span class="number">5</span>), |
| }, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<5>)"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::ErrorKind::GroupNameInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<5a>)"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::ErrorKind::GroupNameInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<¾>)"</span>).parse().unwrap_err(), |
| TestError { |
| span: Span::new( |
| Position::new(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>), |
| Position::new(<span class="number">6</span>, <span class="number">1</span>, <span class="number">6</span>), |
| ), |
| kind: ast::ErrorKind::GroupNameInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<¾a>)"</span>).parse().unwrap_err(), |
| TestError { |
| span: Span::new( |
| Position::new(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>), |
| Position::new(<span class="number">6</span>, <span class="number">1</span>, <span class="number">6</span>), |
| ), |
| kind: ast::ErrorKind::GroupNameInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<☃>)"</span>).parse().unwrap_err(), |
| TestError { |
| span: Span::new( |
| Position::new(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>), |
| Position::new(<span class="number">7</span>, <span class="number">1</span>, <span class="number">6</span>), |
| ), |
| kind: ast::ErrorKind::GroupNameInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?P<a☃>)"</span>).parse().unwrap_err(), |
| TestError { |
| span: Span::new( |
| Position::new(<span class="number">5</span>, <span class="number">1</span>, <span class="number">6</span>), |
| Position::new(<span class="number">8</span>, <span class="number">1</span>, <span class="number">7</span>), |
| ), |
| kind: ast::ErrorKind::GroupNameInvalid, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_flags() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"i:"</span>).parse_flags(), |
| <span class="prelude-val">Ok</span>(ast::Flags { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| items: <span class="macro">vec!</span>[ast::FlagsItem { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::FlagsItemKind::Flag(ast::Flag::CaseInsensitive), |
| }], |
| }) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"i)"</span>).parse_flags(), |
| <span class="prelude-val">Ok</span>(ast::Flags { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| items: <span class="macro">vec!</span>[ast::FlagsItem { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::FlagsItemKind::Flag(ast::Flag::CaseInsensitive), |
| }], |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"isU:"</span>).parse_flags(), |
| <span class="prelude-val">Ok</span>(ast::Flags { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| items: <span class="macro">vec!</span>[ |
| ast::FlagsItem { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::CaseInsensitive |
| ), |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::DotMatchesNewLine |
| ), |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::FlagsItemKind::Flag(ast::Flag::SwapGreed), |
| }, |
| ], |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"-isU:"</span>).parse_flags(), |
| <span class="prelude-val">Ok</span>(ast::Flags { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| items: <span class="macro">vec!</span>[ |
| ast::FlagsItem { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::FlagsItemKind::Negation, |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::CaseInsensitive |
| ), |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::DotMatchesNewLine |
| ), |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::FlagsItemKind::Flag(ast::Flag::SwapGreed), |
| }, |
| ], |
| }) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"i-sU:"</span>).parse_flags(), |
| <span class="prelude-val">Ok</span>(ast::Flags { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| items: <span class="macro">vec!</span>[ |
| ast::FlagsItem { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::CaseInsensitive |
| ), |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::FlagsItemKind::Negation, |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::DotMatchesNewLine |
| ), |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::FlagsItemKind::Flag(ast::Flag::SwapGreed), |
| }, |
| ], |
| }) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"i-sR:"</span>).parse_flags(), |
| <span class="prelude-val">Ok</span>(ast::Flags { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| items: <span class="macro">vec!</span>[ |
| ast::FlagsItem { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::CaseInsensitive |
| ), |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::FlagsItemKind::Negation, |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::FlagsItemKind::Flag( |
| ast::Flag::DotMatchesNewLine |
| ), |
| }, |
| ast::FlagsItem { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::FlagsItemKind::Flag(ast::Flag::CRLF), |
| }, |
| ], |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"isU"</span>).parse_flags().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::FlagUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"isUa:"</span>).parse_flags().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::FlagUnrecognized, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"isUi:"</span>).parse_flags().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::FlagDuplicate { original: span(<span class="number">0</span>..<span class="number">1</span>) }, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"i-sU-i:"</span>).parse_flags().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::ErrorKind::FlagRepeatedNegation { |
| original: span(<span class="number">1</span>..<span class="number">2</span>), |
| }, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"-)"</span>).parse_flags().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::FlagDanglingNegation, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"i-)"</span>).parse_flags().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::FlagDanglingNegation, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"iU-)"</span>).parse_flags().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::FlagDanglingNegation, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_flag() { |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"i"</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::CaseInsensitive)); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"m"</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::MultiLine)); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"s"</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::DotMatchesNewLine)); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"U"</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::SwapGreed)); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"u"</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::Unicode)); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"R"</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::CRLF)); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"x"</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::IgnoreWhitespace)); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"a"</span>).parse_flag().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::FlagUnrecognized, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"☃"</span>).parse_flag().unwrap_err(), |
| TestError { |
| span: span_range(<span class="string">"☃"</span>, <span class="number">0</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::FlagUnrecognized, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_primitive_non_escape() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"."</span>).parse_primitive(), |
| <span class="prelude-val">Ok</span>(Primitive::Dot(span(<span class="number">0</span>..<span class="number">1</span>))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"^"</span>).parse_primitive(), |
| <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::AssertionKind::StartLine, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"$"</span>).parse_primitive(), |
| <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::AssertionKind::EndLine, |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"a"</span>).parse_primitive(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'a'</span>, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"|"</span>).parse_primitive(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'|'</span>, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"☃"</span>).parse_primitive(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span_range(<span class="string">"☃"</span>, <span class="number">0</span>..<span class="number">3</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'☃'</span>, |
| })) |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_escape() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\|"</span>).parse_primitive(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::LiteralKind::Meta, |
| c: <span class="string">'|'</span>, |
| })) |
| ); |
| <span class="kw">let </span>specials = <span class="kw-2">&</span>[ |
| (<span class="string">r"\a"</span>, <span class="string">'\x07'</span>, ast::SpecialLiteralKind::Bell), |
| (<span class="string">r"\f"</span>, <span class="string">'\x0C'</span>, ast::SpecialLiteralKind::FormFeed), |
| (<span class="string">r"\t"</span>, <span class="string">'\t'</span>, ast::SpecialLiteralKind::Tab), |
| (<span class="string">r"\n"</span>, <span class="string">'\n'</span>, ast::SpecialLiteralKind::LineFeed), |
| (<span class="string">r"\r"</span>, <span class="string">'\r'</span>, ast::SpecialLiteralKind::CarriageReturn), |
| (<span class="string">r"\v"</span>, <span class="string">'\x0B'</span>, ast::SpecialLiteralKind::VerticalTab), |
| ]; |
| <span class="kw">for </span><span class="kw-2">&</span>(pat, c, <span class="kw-2">ref </span>kind) <span class="kw">in </span>specials { |
| <span class="macro">assert_eq!</span>( |
| parser(pat).parse_primitive(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::LiteralKind::Special(kind.clone()), |
| c, |
| })) |
| ); |
| } |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\A"</span>).parse_primitive(), |
| <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::AssertionKind::StartText, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\z"</span>).parse_primitive(), |
| <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::AssertionKind::EndText, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\b"</span>).parse_primitive(), |
| <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::AssertionKind::WordBoundary, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\B"</span>).parse_primitive(), |
| <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::AssertionKind::NotWordBoundary, |
| })) |
| ); |
| |
| <span class="comment">// We also support superfluous escapes in most cases now too. |
| </span><span class="kw">for </span>c <span class="kw">in </span>[<span class="string">'!'</span>, <span class="string">'@'</span>, <span class="string">'%'</span>, <span class="string">'"'</span>, <span class="string">'\''</span>, <span class="string">'/'</span>, <span class="string">' '</span>] { |
| <span class="kw">let </span>pat = <span class="macro">format!</span>(<span class="string">r"\{}"</span>, c); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="kw-2">&</span>pat).parse_primitive(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::LiteralKind::Superfluous, |
| c, |
| })) |
| ); |
| } |
| |
| <span class="comment">// Some superfluous escapes, namely [0-9A-Za-z], are still banned. This |
| // gives flexibility for future evolution. |
| </span><span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\e"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::EscapeUnrecognized, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\y"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::EscapeUnrecognized, |
| } |
| ); |
| <span class="comment">// But also, < and > are banned, so that we may evolve them into |
| // start/end word boundary assertions. (Not sure if we will...) |
| </span><span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\<"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::EscapeUnrecognized, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\>"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::EscapeUnrecognized, |
| } |
| ); |
| |
| <span class="comment">// An unfinished escape is illegal. |
| </span><span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::EscapeUnexpectedEof, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_unsupported_backreference() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\0"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::UnsupportedBackreference, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\9"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::UnsupportedBackreference, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_octal() { |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">511 </span>{ |
| <span class="kw">let </span>pat = <span class="macro">format!</span>(<span class="string">r"\{:o}"</span>, i); |
| <span class="macro">assert_eq!</span>( |
| parser_octal(<span class="kw-2">&</span>pat).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..pat.len()), |
| kind: ast::LiteralKind::Octal, |
| c: char::from_u32(i).unwrap(), |
| })) |
| ); |
| } |
| <span class="macro">assert_eq!</span>( |
| parser_octal(<span class="string">r"\778"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| kind: ast::LiteralKind::Octal, |
| c: <span class="string">'?'</span>, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_octal(<span class="string">r"\7777"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| kind: ast::LiteralKind::Octal, |
| c: <span class="string">'\u{01FF}'</span>, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_octal(<span class="string">r"\778"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Concat(ast::Concat { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| asts: <span class="macro">vec!</span>[ |
| Ast::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| kind: ast::LiteralKind::Octal, |
| c: <span class="string">'?'</span>, |
| }), |
| Ast::Literal(ast::Literal { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'8'</span>, |
| }), |
| ], |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_octal(<span class="string">r"\7777"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Concat(ast::Concat { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| asts: <span class="macro">vec!</span>[ |
| Ast::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| kind: ast::LiteralKind::Octal, |
| c: <span class="string">'\u{01FF}'</span>, |
| }), |
| Ast::Literal(ast::Literal { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'7'</span>, |
| }), |
| ], |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser_octal(<span class="string">r"\8"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::EscapeUnrecognized, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_hex_two() { |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">256 </span>{ |
| <span class="kw">let </span>pat = <span class="macro">format!</span>(<span class="string">r"\x{:02x}"</span>, i); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="kw-2">&</span>pat).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..pat.len()), |
| kind: ast::LiteralKind::HexFixed(ast::HexLiteralKind::X), |
| c: char::from_u32(i).unwrap(), |
| })) |
| ); |
| } |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\xF"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::EscapeUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\xG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\xFG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_hex_four() { |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">65536 </span>{ |
| <span class="kw">let </span>c = <span class="kw">match </span>char::from_u32(i) { |
| <span class="prelude-val">None </span>=> <span class="kw">continue</span>, |
| <span class="prelude-val">Some</span>(c) => c, |
| }; |
| <span class="kw">let </span>pat = <span class="macro">format!</span>(<span class="string">r"\u{:04x}"</span>, i); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="kw-2">&</span>pat).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..pat.len()), |
| kind: ast::LiteralKind::HexFixed( |
| ast::HexLiteralKind::UnicodeShort |
| ), |
| c, |
| })) |
| ); |
| } |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\uF"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::EscapeUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\uG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\uFG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\uFFG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\uFFFG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">5</span>..<span class="number">6</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\uD800"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">6</span>), |
| kind: ast::ErrorKind::EscapeHexInvalid, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_hex_eight() { |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">65536 </span>{ |
| <span class="kw">let </span>c = <span class="kw">match </span>char::from_u32(i) { |
| <span class="prelude-val">None </span>=> <span class="kw">continue</span>, |
| <span class="prelude-val">Some</span>(c) => c, |
| }; |
| <span class="kw">let </span>pat = <span class="macro">format!</span>(<span class="string">r"\U{:08x}"</span>, i); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="kw-2">&</span>pat).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..pat.len()), |
| kind: ast::LiteralKind::HexFixed( |
| ast::HexLiteralKind::UnicodeLong |
| ), |
| c, |
| })) |
| ); |
| } |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\UF"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::EscapeUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\UG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\UFG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\UFFG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\UFFFG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">5</span>..<span class="number">6</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\UFFFFG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">6</span>..<span class="number">7</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\UFFFFFG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">7</span>..<span class="number">8</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\UFFFFFFG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">8</span>..<span class="number">9</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\UFFFFFFFG"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">9</span>..<span class="number">10</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_hex_brace() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\u{26c4}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">8</span>), |
| kind: ast::LiteralKind::HexBrace( |
| ast::HexLiteralKind::UnicodeShort |
| ), |
| c: <span class="string">'⛄'</span>, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\U{26c4}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">8</span>), |
| kind: ast::LiteralKind::HexBrace( |
| ast::HexLiteralKind::UnicodeLong |
| ), |
| c: <span class="string">'⛄'</span>, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\x{26c4}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">8</span>), |
| kind: ast::LiteralKind::HexBrace(ast::HexLiteralKind::X), |
| c: <span class="string">'⛄'</span>, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\x{26C4}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">8</span>), |
| kind: ast::LiteralKind::HexBrace(ast::HexLiteralKind::X), |
| c: <span class="string">'⛄'</span>, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\x{10fFfF}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal { |
| span: span(<span class="number">0</span>..<span class="number">10</span>), |
| kind: ast::LiteralKind::HexBrace(ast::HexLiteralKind::X), |
| c: <span class="string">'\u{10FFFF}'</span>, |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\x"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::EscapeUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\x{"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::EscapeUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\x{FF"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">5</span>), |
| kind: ast::ErrorKind::EscapeUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\x{}"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::EscapeHexEmpty, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\x{FGF}"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::ErrorKind::EscapeHexInvalidDigit, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\x{FFFFFF}"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">9</span>), |
| kind: ast::ErrorKind::EscapeHexInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\x{D800}"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">7</span>), |
| kind: ast::ErrorKind::EscapeHexInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\x{FFFFFFFFF}"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">12</span>), |
| kind: ast::ErrorKind::EscapeHexInvalid, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_decimal() { |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"123"</span>).parse_decimal(), <span class="prelude-val">Ok</span>(<span class="number">123</span>)); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"0"</span>).parse_decimal(), <span class="prelude-val">Ok</span>(<span class="number">0</span>)); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"01"</span>).parse_decimal(), <span class="prelude-val">Ok</span>(<span class="number">1</span>)); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"-1"</span>).parse_decimal().unwrap_err(), |
| TestError { span: span(<span class="number">0</span>..<span class="number">0</span>), kind: ast::ErrorKind::DecimalEmpty } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">""</span>).parse_decimal().unwrap_err(), |
| TestError { span: span(<span class="number">0</span>..<span class="number">0</span>), kind: ast::ErrorKind::DecimalEmpty } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"9999999999"</span>).parse_decimal().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">10</span>), |
| kind: ast::ErrorKind::DecimalInvalid, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_set_class() { |
| <span class="kw">fn </span>union(span: Span, items: Vec<ast::ClassSetItem>) -> ast::ClassSet { |
| ast::ClassSet::union(ast::ClassSetUnion { span, items }) |
| } |
| |
| <span class="kw">fn </span>intersection( |
| span: Span, |
| lhs: ast::ClassSet, |
| rhs: ast::ClassSet, |
| ) -> ast::ClassSet { |
| ast::ClassSet::BinaryOp(ast::ClassSetBinaryOp { |
| span, |
| kind: ast::ClassSetBinaryOpKind::Intersection, |
| lhs: Box::new(lhs), |
| rhs: Box::new(rhs), |
| }) |
| } |
| |
| <span class="kw">fn </span>difference( |
| span: Span, |
| lhs: ast::ClassSet, |
| rhs: ast::ClassSet, |
| ) -> ast::ClassSet { |
| ast::ClassSet::BinaryOp(ast::ClassSetBinaryOp { |
| span, |
| kind: ast::ClassSetBinaryOpKind::Difference, |
| lhs: Box::new(lhs), |
| rhs: Box::new(rhs), |
| }) |
| } |
| |
| <span class="kw">fn </span>symdifference( |
| span: Span, |
| lhs: ast::ClassSet, |
| rhs: ast::ClassSet, |
| ) -> ast::ClassSet { |
| ast::ClassSet::BinaryOp(ast::ClassSetBinaryOp { |
| span, |
| kind: ast::ClassSetBinaryOpKind::SymmetricDifference, |
| lhs: Box::new(lhs), |
| rhs: Box::new(rhs), |
| }) |
| } |
| |
| <span class="kw">fn </span>itemset(item: ast::ClassSetItem) -> ast::ClassSet { |
| ast::ClassSet::Item(item) |
| } |
| |
| <span class="kw">fn </span>item_ascii(cls: ast::ClassAscii) -> ast::ClassSetItem { |
| ast::ClassSetItem::Ascii(cls) |
| } |
| |
| <span class="kw">fn </span>item_unicode(cls: ast::ClassUnicode) -> ast::ClassSetItem { |
| ast::ClassSetItem::Unicode(cls) |
| } |
| |
| <span class="kw">fn </span>item_perl(cls: ast::ClassPerl) -> ast::ClassSetItem { |
| ast::ClassSetItem::Perl(cls) |
| } |
| |
| <span class="kw">fn </span>item_bracket(cls: ast::ClassBracketed) -> ast::ClassSetItem { |
| ast::ClassSetItem::Bracketed(Box::new(cls)) |
| } |
| |
| <span class="kw">fn </span>lit(span: Span, c: char) -> ast::ClassSetItem { |
| ast::ClassSetItem::Literal(ast::Literal { |
| span, |
| kind: ast::LiteralKind::Verbatim, |
| c, |
| }) |
| } |
| |
| <span class="kw">fn </span>empty(span: Span) -> ast::ClassSetItem { |
| ast::ClassSetItem::Empty(span) |
| } |
| |
| <span class="kw">fn </span>range(span: Span, start: char, end: char) -> ast::ClassSetItem { |
| <span class="kw">let </span>pos1 = Position { |
| offset: span.start.offset + start.len_utf8(), |
| column: span.start.column + <span class="number">1</span>, |
| ..span.start |
| }; |
| <span class="kw">let </span>pos2 = Position { |
| offset: span.end.offset - end.len_utf8(), |
| column: span.end.column - <span class="number">1</span>, |
| ..span.end |
| }; |
| ast::ClassSetItem::Range(ast::ClassSetRange { |
| span, |
| start: ast::Literal { |
| span: Span { end: pos1, ..span }, |
| kind: ast::LiteralKind::Verbatim, |
| c: start, |
| }, |
| end: ast::Literal { |
| span: Span { start: pos2, ..span }, |
| kind: ast::LiteralKind::Verbatim, |
| c: end, |
| }, |
| }) |
| } |
| |
| <span class="kw">fn </span>alnum(span: Span, negated: bool) -> ast::ClassAscii { |
| ast::ClassAscii { span, kind: ast::ClassAsciiKind::Alnum, negated } |
| } |
| |
| <span class="kw">fn </span>lower(span: Span, negated: bool) -> ast::ClassAscii { |
| ast::ClassAscii { span, kind: ast::ClassAsciiKind::Lower, negated } |
| } |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[[:alnum:]]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">11</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: itemset(item_ascii(alnum(span(<span class="number">1</span>..<span class="number">10</span>), <span class="bool-val">false</span>))), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[[[:alnum:]]]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">13</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: itemset(item_bracket(ast::ClassBracketed { |
| span: span(<span class="number">1</span>..<span class="number">12</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: itemset(item_ascii(alnum(span(<span class="number">2</span>..<span class="number">11</span>), <span class="bool-val">false</span>))), |
| })), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[[:alnum:]&&[:lower:]]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">22</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: intersection( |
| span(<span class="number">1</span>..<span class="number">21</span>), |
| itemset(item_ascii(alnum(span(<span class="number">1</span>..<span class="number">10</span>), <span class="bool-val">false</span>))), |
| itemset(item_ascii(lower(span(<span class="number">12</span>..<span class="number">21</span>), <span class="bool-val">false</span>))), |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[[:alnum:]--[:lower:]]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">22</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: difference( |
| span(<span class="number">1</span>..<span class="number">21</span>), |
| itemset(item_ascii(alnum(span(<span class="number">1</span>..<span class="number">10</span>), <span class="bool-val">false</span>))), |
| itemset(item_ascii(lower(span(<span class="number">12</span>..<span class="number">21</span>), <span class="bool-val">false</span>))), |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[[:alnum:]~~[:lower:]]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">22</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: symdifference( |
| span(<span class="number">1</span>..<span class="number">21</span>), |
| itemset(item_ascii(alnum(span(<span class="number">1</span>..<span class="number">10</span>), <span class="bool-val">false</span>))), |
| itemset(item_ascii(lower(span(<span class="number">12</span>..<span class="number">21</span>), <span class="bool-val">false</span>))), |
| ), |
| }))) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[a]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: itemset(lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">'a'</span>)), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[a\]]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: union( |
| span(<span class="number">1</span>..<span class="number">4</span>), |
| <span class="macro">vec!</span>[ |
| lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">'a'</span>), |
| ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">2</span>..<span class="number">4</span>), |
| kind: ast::LiteralKind::Meta, |
| c: <span class="string">']'</span>, |
| }), |
| ] |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[a\-z]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">6</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: union( |
| span(<span class="number">1</span>..<span class="number">5</span>), |
| <span class="macro">vec!</span>[ |
| lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">'a'</span>), |
| ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">2</span>..<span class="number">4</span>), |
| kind: ast::LiteralKind::Meta, |
| c: <span class="string">'-'</span>, |
| }), |
| lit(span(<span class="number">4</span>..<span class="number">5</span>), <span class="string">'z'</span>), |
| ] |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[ab]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: union( |
| span(<span class="number">1</span>..<span class="number">3</span>), |
| <span class="macro">vec!</span>[lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">'a'</span>), lit(span(<span class="number">2</span>..<span class="number">3</span>), <span class="string">'b'</span>),] |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[a-]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: union( |
| span(<span class="number">1</span>..<span class="number">3</span>), |
| <span class="macro">vec!</span>[lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">'a'</span>), lit(span(<span class="number">2</span>..<span class="number">3</span>), <span class="string">'-'</span>),] |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[-a]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: union( |
| span(<span class="number">1</span>..<span class="number">3</span>), |
| <span class="macro">vec!</span>[lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">'-'</span>), lit(span(<span class="number">2</span>..<span class="number">3</span>), <span class="string">'a'</span>),] |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[\pL]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: itemset(item_unicode(ast::ClassUnicode { |
| span: span(<span class="number">1</span>..<span class="number">4</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassUnicodeKind::OneLetter(<span class="string">'L'</span>), |
| })), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[\w]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: itemset(item_perl(ast::ClassPerl { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| kind: ast::ClassPerlKind::Word, |
| negated: <span class="bool-val">false</span>, |
| })), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[a\wz]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">6</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: union( |
| span(<span class="number">1</span>..<span class="number">5</span>), |
| <span class="macro">vec!</span>[ |
| lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">'a'</span>), |
| item_perl(ast::ClassPerl { |
| span: span(<span class="number">2</span>..<span class="number">4</span>), |
| kind: ast::ClassPerlKind::Word, |
| negated: <span class="bool-val">false</span>, |
| }), |
| lit(span(<span class="number">4</span>..<span class="number">5</span>), <span class="string">'z'</span>), |
| ] |
| ), |
| }))) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[a-z]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: itemset(range(span(<span class="number">1</span>..<span class="number">4</span>), <span class="string">'a'</span>, <span class="string">'z'</span>)), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[a-cx-z]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">8</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: union( |
| span(<span class="number">1</span>..<span class="number">7</span>), |
| <span class="macro">vec!</span>[ |
| range(span(<span class="number">1</span>..<span class="number">4</span>), <span class="string">'a'</span>, <span class="string">'c'</span>), |
| range(span(<span class="number">4</span>..<span class="number">7</span>), <span class="string">'x'</span>, <span class="string">'z'</span>), |
| ] |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[\w&&a-cx-z]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">12</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: intersection( |
| span(<span class="number">1</span>..<span class="number">11</span>), |
| itemset(item_perl(ast::ClassPerl { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| kind: ast::ClassPerlKind::Word, |
| negated: <span class="bool-val">false</span>, |
| })), |
| union( |
| span(<span class="number">5</span>..<span class="number">11</span>), |
| <span class="macro">vec!</span>[ |
| range(span(<span class="number">5</span>..<span class="number">8</span>), <span class="string">'a'</span>, <span class="string">'c'</span>), |
| range(span(<span class="number">8</span>..<span class="number">11</span>), <span class="string">'x'</span>, <span class="string">'z'</span>), |
| ] |
| ), |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[a-cx-z&&\w]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">12</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: intersection( |
| span(<span class="number">1</span>..<span class="number">11</span>), |
| union( |
| span(<span class="number">1</span>..<span class="number">7</span>), |
| <span class="macro">vec!</span>[ |
| range(span(<span class="number">1</span>..<span class="number">4</span>), <span class="string">'a'</span>, <span class="string">'c'</span>), |
| range(span(<span class="number">4</span>..<span class="number">7</span>), <span class="string">'x'</span>, <span class="string">'z'</span>), |
| ] |
| ), |
| itemset(item_perl(ast::ClassPerl { |
| span: span(<span class="number">9</span>..<span class="number">11</span>), |
| kind: ast::ClassPerlKind::Word, |
| negated: <span class="bool-val">false</span>, |
| })), |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[a--b--c]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">9</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: difference( |
| span(<span class="number">1</span>..<span class="number">8</span>), |
| difference( |
| span(<span class="number">1</span>..<span class="number">5</span>), |
| itemset(lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">'a'</span>)), |
| itemset(lit(span(<span class="number">4</span>..<span class="number">5</span>), <span class="string">'b'</span>)), |
| ), |
| itemset(lit(span(<span class="number">7</span>..<span class="number">8</span>), <span class="string">'c'</span>)), |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[a~~b~~c]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">9</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: symdifference( |
| span(<span class="number">1</span>..<span class="number">8</span>), |
| symdifference( |
| span(<span class="number">1</span>..<span class="number">5</span>), |
| itemset(lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">'a'</span>)), |
| itemset(lit(span(<span class="number">4</span>..<span class="number">5</span>), <span class="string">'b'</span>)), |
| ), |
| itemset(lit(span(<span class="number">7</span>..<span class="number">8</span>), <span class="string">'c'</span>)), |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[\^&&^]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">7</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: intersection( |
| span(<span class="number">1</span>..<span class="number">6</span>), |
| itemset(ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| kind: ast::LiteralKind::Meta, |
| c: <span class="string">'^'</span>, |
| })), |
| itemset(lit(span(<span class="number">5</span>..<span class="number">6</span>), <span class="string">'^'</span>)), |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[\&&&&]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">7</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: intersection( |
| span(<span class="number">1</span>..<span class="number">6</span>), |
| itemset(ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| kind: ast::LiteralKind::Meta, |
| c: <span class="string">'&'</span>, |
| })), |
| itemset(lit(span(<span class="number">5</span>..<span class="number">6</span>), <span class="string">'&'</span>)), |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[&&&&]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">6</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: intersection( |
| span(<span class="number">1</span>..<span class="number">5</span>), |
| intersection( |
| span(<span class="number">1</span>..<span class="number">3</span>), |
| itemset(empty(span(<span class="number">1</span>..<span class="number">1</span>))), |
| itemset(empty(span(<span class="number">3</span>..<span class="number">3</span>))), |
| ), |
| itemset(empty(span(<span class="number">5</span>..<span class="number">5</span>))), |
| ), |
| }))) |
| ); |
| |
| <span class="kw">let </span>pat = <span class="string">"[☃-⛄]"</span>; |
| <span class="macro">assert_eq!</span>( |
| parser(pat).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span_range(pat, <span class="number">0</span>..<span class="number">9</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: itemset(ast::ClassSetItem::Range(ast::ClassSetRange { |
| span: span_range(pat, <span class="number">1</span>..<span class="number">8</span>), |
| start: ast::Literal { |
| span: span_range(pat, <span class="number">1</span>..<span class="number">4</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'☃'</span>, |
| }, |
| end: ast::Literal { |
| span: span_range(pat, <span class="number">5</span>..<span class="number">8</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'⛄'</span>, |
| }, |
| })), |
| }))) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[]]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: itemset(lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">']'</span>)), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[]\[]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: union( |
| span(<span class="number">1</span>..<span class="number">4</span>), |
| <span class="macro">vec!</span>[ |
| lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">']'</span>), |
| ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">2</span>..<span class="number">4</span>), |
| kind: ast::LiteralKind::Meta, |
| c: <span class="string">'['</span>, |
| }), |
| ] |
| ), |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[\[]]"</span>).parse(), |
| <span class="prelude-val">Ok</span>(concat( |
| <span class="number">0</span>..<span class="number">5</span>, |
| <span class="macro">vec!</span>[ |
| Ast::Class(ast::Class::Bracketed(ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: itemset(ast::ClassSetItem::Literal( |
| ast::Literal { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| kind: ast::LiteralKind::Meta, |
| c: <span class="string">'['</span>, |
| } |
| )), |
| })), |
| Ast::Literal(ast::Literal { |
| span: span(<span class="number">4</span>..<span class="number">5</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">']'</span>, |
| }), |
| ] |
| )) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"["</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::ClassUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[["</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::ClassUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[[-]"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::ClassUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[[[:alnum:]"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::ClassUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[\b]"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::ClassEscapeInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[\w-a]"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::ClassRangeLiteral, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[a-\w]"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">5</span>), |
| kind: ast::ErrorKind::ClassRangeLiteral, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[z-a]"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">1</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::ClassRangeInvalid, |
| } |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser_ignore_whitespace(<span class="string">"[a "</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::ClassUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_ignore_whitespace(<span class="string">"[a- "</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::ClassUnclosed, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_set_class_open() { |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"[a]"</span>).parse_set_class_open(), { |
| <span class="kw">let </span>set = ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassSet::union(ast::ClassSetUnion { |
| span: span(<span class="number">1</span>..<span class="number">1</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| }; |
| <span class="kw">let </span>union = ast::ClassSetUnion { span: span(<span class="number">1</span>..<span class="number">1</span>), items: <span class="macro">vec!</span>[] }; |
| <span class="prelude-val">Ok</span>((set, union)) |
| }); |
| <span class="macro">assert_eq!</span>( |
| parser_ignore_whitespace(<span class="string">"[ a]"</span>).parse_set_class_open(), |
| { |
| <span class="kw">let </span>set = ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassSet::union(ast::ClassSetUnion { |
| span: span(<span class="number">4</span>..<span class="number">4</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| }; |
| <span class="kw">let </span>union = |
| ast::ClassSetUnion { span: span(<span class="number">4</span>..<span class="number">4</span>), items: <span class="macro">vec!</span>[] }; |
| <span class="prelude-val">Ok</span>((set, union)) |
| } |
| ); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"[^a]"</span>).parse_set_class_open(), { |
| <span class="kw">let </span>set = ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| negated: <span class="bool-val">true</span>, |
| kind: ast::ClassSet::union(ast::ClassSetUnion { |
| span: span(<span class="number">2</span>..<span class="number">2</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| }; |
| <span class="kw">let </span>union = ast::ClassSetUnion { span: span(<span class="number">2</span>..<span class="number">2</span>), items: <span class="macro">vec!</span>[] }; |
| <span class="prelude-val">Ok</span>((set, union)) |
| }); |
| <span class="macro">assert_eq!</span>( |
| parser_ignore_whitespace(<span class="string">"[ ^ a]"</span>).parse_set_class_open(), |
| { |
| <span class="kw">let </span>set = ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| negated: <span class="bool-val">true</span>, |
| kind: ast::ClassSet::union(ast::ClassSetUnion { |
| span: span(<span class="number">4</span>..<span class="number">4</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| }; |
| <span class="kw">let </span>union = |
| ast::ClassSetUnion { span: span(<span class="number">4</span>..<span class="number">4</span>), items: <span class="macro">vec!</span>[] }; |
| <span class="prelude-val">Ok</span>((set, union)) |
| } |
| ); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"[-a]"</span>).parse_set_class_open(), { |
| <span class="kw">let </span>set = ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassSet::union(ast::ClassSetUnion { |
| span: span(<span class="number">1</span>..<span class="number">1</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| }; |
| <span class="kw">let </span>union = ast::ClassSetUnion { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'-'</span>, |
| })], |
| }; |
| <span class="prelude-val">Ok</span>((set, union)) |
| }); |
| <span class="macro">assert_eq!</span>( |
| parser_ignore_whitespace(<span class="string">"[ - a]"</span>).parse_set_class_open(), |
| { |
| <span class="kw">let </span>set = ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassSet::union(ast::ClassSetUnion { |
| span: span(<span class="number">2</span>..<span class="number">2</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| }; |
| <span class="kw">let </span>union = ast::ClassSetUnion { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'-'</span>, |
| })], |
| }; |
| <span class="prelude-val">Ok</span>((set, union)) |
| } |
| ); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"[^-a]"</span>).parse_set_class_open(), { |
| <span class="kw">let </span>set = ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| negated: <span class="bool-val">true</span>, |
| kind: ast::ClassSet::union(ast::ClassSetUnion { |
| span: span(<span class="number">2</span>..<span class="number">2</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| }; |
| <span class="kw">let </span>union = ast::ClassSetUnion { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'-'</span>, |
| })], |
| }; |
| <span class="prelude-val">Ok</span>((set, union)) |
| }); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"[--a]"</span>).parse_set_class_open(), { |
| <span class="kw">let </span>set = ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassSet::union(ast::ClassSetUnion { |
| span: span(<span class="number">1</span>..<span class="number">1</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| }; |
| <span class="kw">let </span>union = ast::ClassSetUnion { |
| span: span(<span class="number">1</span>..<span class="number">3</span>), |
| items: <span class="macro">vec!</span>[ |
| ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'-'</span>, |
| }), |
| ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'-'</span>, |
| }), |
| ], |
| }; |
| <span class="prelude-val">Ok</span>((set, union)) |
| }); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"[]a]"</span>).parse_set_class_open(), { |
| <span class="kw">let </span>set = ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassSet::union(ast::ClassSetUnion { |
| span: span(<span class="number">1</span>..<span class="number">1</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| }; |
| <span class="kw">let </span>union = ast::ClassSetUnion { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">']'</span>, |
| })], |
| }; |
| <span class="prelude-val">Ok</span>((set, union)) |
| }); |
| <span class="macro">assert_eq!</span>( |
| parser_ignore_whitespace(<span class="string">"[ ] a]"</span>).parse_set_class_open(), |
| { |
| <span class="kw">let </span>set = ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassSet::union(ast::ClassSetUnion { |
| span: span(<span class="number">2</span>..<span class="number">2</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| }; |
| <span class="kw">let </span>union = ast::ClassSetUnion { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">']'</span>, |
| })], |
| }; |
| <span class="prelude-val">Ok</span>((set, union)) |
| } |
| ); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"[^]a]"</span>).parse_set_class_open(), { |
| <span class="kw">let </span>set = ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| negated: <span class="bool-val">true</span>, |
| kind: ast::ClassSet::union(ast::ClassSetUnion { |
| span: span(<span class="number">2</span>..<span class="number">2</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| }; |
| <span class="kw">let </span>union = ast::ClassSetUnion { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">']'</span>, |
| })], |
| }; |
| <span class="prelude-val">Ok</span>((set, union)) |
| }); |
| <span class="macro">assert_eq!</span>(parser(<span class="string">"[-]a]"</span>).parse_set_class_open(), { |
| <span class="kw">let </span>set = ast::ClassBracketed { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassSet::union(ast::ClassSetUnion { |
| span: span(<span class="number">1</span>..<span class="number">1</span>), |
| items: <span class="macro">vec!</span>[], |
| }), |
| }; |
| <span class="kw">let </span>union = ast::ClassSetUnion { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal { |
| span: span(<span class="number">1</span>..<span class="number">2</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'-'</span>, |
| })], |
| }; |
| <span class="prelude-val">Ok</span>((set, union)) |
| }); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"["</span>).parse_set_class_open().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">1</span>), |
| kind: ast::ErrorKind::ClassUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser_ignore_whitespace(<span class="string">"[ "</span>) |
| .parse_set_class_open() |
| .unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| kind: ast::ErrorKind::ClassUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[^"</span>).parse_set_class_open().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::ClassUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[]"</span>).parse_set_class_open().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::ClassUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[-"</span>).parse_set_class_open().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">0</span>), |
| kind: ast::ErrorKind::ClassUnclosed, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">"[--"</span>).parse_set_class_open().unwrap_err(), |
| TestError { |
| span: span(<span class="number">0</span>..<span class="number">0</span>), |
| kind: ast::ErrorKind::ClassUnclosed, |
| } |
| ); |
| |
| <span class="comment">// See: https://github.com/rust-lang/regex/issues/792 |
| </span><span class="macro">assert_eq!</span>( |
| parser(<span class="string">"(?x)[-#]"</span>).parse_with_comments().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::ClassUnclosed, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>maybe_parse_ascii_class() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[:alnum:]"</span>).maybe_parse_ascii_class(), |
| <span class="prelude-val">Some</span>(ast::ClassAscii { |
| span: span(<span class="number">0</span>..<span class="number">9</span>), |
| kind: ast::ClassAsciiKind::Alnum, |
| negated: <span class="bool-val">false</span>, |
| }) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[:alnum:]A"</span>).maybe_parse_ascii_class(), |
| <span class="prelude-val">Some</span>(ast::ClassAscii { |
| span: span(<span class="number">0</span>..<span class="number">9</span>), |
| kind: ast::ClassAsciiKind::Alnum, |
| negated: <span class="bool-val">false</span>, |
| }) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"[:^alnum:]"</span>).maybe_parse_ascii_class(), |
| <span class="prelude-val">Some</span>(ast::ClassAscii { |
| span: span(<span class="number">0</span>..<span class="number">10</span>), |
| kind: ast::ClassAsciiKind::Alnum, |
| negated: <span class="bool-val">true</span>, |
| }) |
| ); |
| |
| <span class="kw">let </span>p = parser(<span class="string">r"[:"</span>); |
| <span class="macro">assert_eq!</span>(p.maybe_parse_ascii_class(), <span class="prelude-val">None</span>); |
| <span class="macro">assert_eq!</span>(p.offset(), <span class="number">0</span>); |
| |
| <span class="kw">let </span>p = parser(<span class="string">r"[:^"</span>); |
| <span class="macro">assert_eq!</span>(p.maybe_parse_ascii_class(), <span class="prelude-val">None</span>); |
| <span class="macro">assert_eq!</span>(p.offset(), <span class="number">0</span>); |
| |
| <span class="kw">let </span>p = parser(<span class="string">r"[^:alnum:]"</span>); |
| <span class="macro">assert_eq!</span>(p.maybe_parse_ascii_class(), <span class="prelude-val">None</span>); |
| <span class="macro">assert_eq!</span>(p.offset(), <span class="number">0</span>); |
| |
| <span class="kw">let </span>p = parser(<span class="string">r"[:alnnum:]"</span>); |
| <span class="macro">assert_eq!</span>(p.maybe_parse_ascii_class(), <span class="prelude-val">None</span>); |
| <span class="macro">assert_eq!</span>(p.offset(), <span class="number">0</span>); |
| |
| <span class="kw">let </span>p = parser(<span class="string">r"[:alnum]"</span>); |
| <span class="macro">assert_eq!</span>(p.maybe_parse_ascii_class(), <span class="prelude-val">None</span>); |
| <span class="macro">assert_eq!</span>(p.offset(), <span class="number">0</span>); |
| |
| <span class="kw">let </span>p = parser(<span class="string">r"[:alnum:"</span>); |
| <span class="macro">assert_eq!</span>(p.maybe_parse_ascii_class(), <span class="prelude-val">None</span>); |
| <span class="macro">assert_eq!</span>(p.offset(), <span class="number">0</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_unicode_class() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\pN"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassUnicodeKind::OneLetter(<span class="string">'N'</span>), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\PN"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| negated: <span class="bool-val">true</span>, |
| kind: ast::ClassUnicodeKind::OneLetter(<span class="string">'N'</span>), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p{N}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassUnicodeKind::Named(s(<span class="string">"N"</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\P{N}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| negated: <span class="bool-val">true</span>, |
| kind: ast::ClassUnicodeKind::Named(s(<span class="string">"N"</span>)), |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p{Greek}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode { |
| span: span(<span class="number">0</span>..<span class="number">9</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassUnicodeKind::Named(s(<span class="string">"Greek"</span>)), |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p{scx:Katakana}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode { |
| span: span(<span class="number">0</span>..<span class="number">16</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassUnicodeKind::NamedValue { |
| op: ast::ClassUnicodeOpKind::Colon, |
| name: s(<span class="string">"scx"</span>), |
| value: s(<span class="string">"Katakana"</span>), |
| }, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p{scx=Katakana}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode { |
| span: span(<span class="number">0</span>..<span class="number">16</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassUnicodeKind::NamedValue { |
| op: ast::ClassUnicodeOpKind::Equal, |
| name: s(<span class="string">"scx"</span>), |
| value: s(<span class="string">"Katakana"</span>), |
| }, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p{scx!=Katakana}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode { |
| span: span(<span class="number">0</span>..<span class="number">17</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassUnicodeKind::NamedValue { |
| op: ast::ClassUnicodeOpKind::NotEqual, |
| name: s(<span class="string">"scx"</span>), |
| value: s(<span class="string">"Katakana"</span>), |
| }, |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p{:}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassUnicodeKind::NamedValue { |
| op: ast::ClassUnicodeOpKind::Colon, |
| name: s(<span class="string">""</span>), |
| value: s(<span class="string">""</span>), |
| }, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p{=}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode { |
| span: span(<span class="number">0</span>..<span class="number">5</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassUnicodeKind::NamedValue { |
| op: ast::ClassUnicodeOpKind::Equal, |
| name: s(<span class="string">""</span>), |
| value: s(<span class="string">""</span>), |
| }, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p{!=}"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode { |
| span: span(<span class="number">0</span>..<span class="number">6</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassUnicodeKind::NamedValue { |
| op: ast::ClassUnicodeOpKind::NotEqual, |
| name: s(<span class="string">""</span>), |
| value: s(<span class="string">""</span>), |
| }, |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">2</span>), |
| kind: ast::ErrorKind::EscapeUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p{"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">3</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::EscapeUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p{N"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">4</span>..<span class="number">4</span>), |
| kind: ast::ErrorKind::EscapeUnexpectedEof, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p{Greek"</span>).parse_escape().unwrap_err(), |
| TestError { |
| span: span(<span class="number">8</span>..<span class="number">8</span>), |
| kind: ast::ErrorKind::EscapeUnexpectedEof, |
| } |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\pNz"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Concat(ast::Concat { |
| span: span(<span class="number">0</span>..<span class="number">4</span>), |
| asts: <span class="macro">vec!</span>[ |
| Ast::Class(ast::Class::Unicode(ast::ClassUnicode { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassUnicodeKind::OneLetter(<span class="string">'N'</span>), |
| })), |
| Ast::Literal(ast::Literal { |
| span: span(<span class="number">3</span>..<span class="number">4</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'z'</span>, |
| }), |
| ], |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p{Greek}z"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Concat(ast::Concat { |
| span: span(<span class="number">0</span>..<span class="number">10</span>), |
| asts: <span class="macro">vec!</span>[ |
| Ast::Class(ast::Class::Unicode(ast::ClassUnicode { |
| span: span(<span class="number">0</span>..<span class="number">9</span>), |
| negated: <span class="bool-val">false</span>, |
| kind: ast::ClassUnicodeKind::Named(s(<span class="string">"Greek"</span>)), |
| })), |
| Ast::Literal(ast::Literal { |
| span: span(<span class="number">9</span>..<span class="number">10</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'z'</span>, |
| }), |
| ], |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\p\{"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::UnicodeClassInvalid, |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\P\{"</span>).parse().unwrap_err(), |
| TestError { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::ErrorKind::UnicodeClassInvalid, |
| } |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_perl_class() { |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\d"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Perl(ast::ClassPerl { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ClassPerlKind::Digit, |
| negated: <span class="bool-val">false</span>, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\D"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Perl(ast::ClassPerl { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ClassPerlKind::Digit, |
| negated: <span class="bool-val">true</span>, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\s"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Perl(ast::ClassPerl { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ClassPerlKind::Space, |
| negated: <span class="bool-val">false</span>, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\S"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Perl(ast::ClassPerl { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ClassPerlKind::Space, |
| negated: <span class="bool-val">true</span>, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\w"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Perl(ast::ClassPerl { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ClassPerlKind::Word, |
| negated: <span class="bool-val">false</span>, |
| })) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\W"</span>).parse_escape(), |
| <span class="prelude-val">Ok</span>(Primitive::Perl(ast::ClassPerl { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ClassPerlKind::Word, |
| negated: <span class="bool-val">true</span>, |
| })) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\d"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Perl(ast::ClassPerl { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ClassPerlKind::Digit, |
| negated: <span class="bool-val">false</span>, |
| }))) |
| ); |
| <span class="macro">assert_eq!</span>( |
| parser(<span class="string">r"\dz"</span>).parse(), |
| <span class="prelude-val">Ok</span>(Ast::Concat(ast::Concat { |
| span: span(<span class="number">0</span>..<span class="number">3</span>), |
| asts: <span class="macro">vec!</span>[ |
| Ast::Class(ast::Class::Perl(ast::ClassPerl { |
| span: span(<span class="number">0</span>..<span class="number">2</span>), |
| kind: ast::ClassPerlKind::Digit, |
| negated: <span class="bool-val">false</span>, |
| })), |
| Ast::Literal(ast::Literal { |
| span: span(<span class="number">2</span>..<span class="number">3</span>), |
| kind: ast::LiteralKind::Verbatim, |
| c: <span class="string">'z'</span>, |
| }), |
| ], |
| })) |
| ); |
| } |
| |
| <span class="comment">// This tests a bug fix where the nest limit checker wasn't decrementing |
| // its depth during post-traversal, which causes long regexes to trip |
| // the default limit too aggressively. |
| </span><span class="attribute">#[test] |
| </span><span class="kw">fn </span>regression_454_nest_too_big() { |
| <span class="kw">let </span>pattern = <span class="string">r#" |
| 2(?: |
| [45]\d{3}| |
| 7(?: |
| 1[0-267]| |
| 2[0-289]| |
| 3[0-29]| |
| 4[01]| |
| 5[1-3]| |
| 6[013]| |
| 7[0178]| |
| 91 |
| )| |
| 8(?: |
| 0[125]| |
| [139][1-6]| |
| 2[0157-9]| |
| 41| |
| 6[1-35]| |
| 7[1-5]| |
| 8[1-8]| |
| 90 |
| )| |
| 9(?: |
| 0[0-2]| |
| 1[0-4]| |
| 2[568]| |
| 3[3-6]| |
| 5[5-7]| |
| 6[0167]| |
| 7[15]| |
| 8[0146-9] |
| ) |
| )\d{4} |
| "#</span>; |
| <span class="macro">assert!</span>(parser_nest_limit(pattern, <span class="number">50</span>).parse().is_ok()); |
| } |
| |
| <span class="comment">// This tests that we treat a trailing `-` in a character class as a |
| // literal `-` even when whitespace mode is enabled and there is whitespace |
| // after the trailing `-`. |
| </span><span class="attribute">#[test] |
| </span><span class="kw">fn </span>regression_455_trailing_dash_ignore_whitespace() { |
| <span class="macro">assert!</span>(parser(<span class="string">"(?x)[ / - ]"</span>).parse().is_ok()); |
| <span class="macro">assert!</span>(parser(<span class="string">"(?x)[ a - ]"</span>).parse().is_ok()); |
| <span class="macro">assert!</span>(parser( |
| <span class="string">"(?x)[ |
| a |
| - ] |
| " |
| </span>) |
| .parse() |
| .is_ok()); |
| <span class="macro">assert!</span>(parser( |
| <span class="string">"(?x)[ |
| a # wat |
| - ] |
| " |
| </span>) |
| .parse() |
| .is_ok()); |
| |
| <span class="macro">assert!</span>(parser(<span class="string">"(?x)[ / -"</span>).parse().is_err()); |
| <span class="macro">assert!</span>(parser(<span class="string">"(?x)[ / - "</span>).parse().is_err()); |
| <span class="macro">assert!</span>(parser( |
| <span class="string">"(?x)[ |
| / - |
| " |
| </span>) |
| .parse() |
| .is_err()); |
| <span class="macro">assert!</span>(parser( |
| <span class="string">"(?x)[ |
| / - # wat |
| " |
| </span>) |
| .parse() |
| .is_err()); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="regex_syntax" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |