| <!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/tantivy-fst-0.4.0/src/regex/compile.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>compile.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="../../../tantivy_fst/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="../../../tantivy_fst/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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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">super</span>::Error; |
| <span class="kw">use </span><span class="kw">super</span>::Inst; |
| <span class="kw">use </span>regex_syntax::hir::{ |
| Class, ClassUnicode, ClassUnicodeRange, Literal, Repetition, RepetitionKind, RepetitionRange, |
| }; |
| <span class="kw">use </span>regex_syntax::hir::{Hir, HirKind}; |
| <span class="kw">use </span>utf8_ranges::{Utf8Sequence, Utf8Sequences}; |
| |
| <span class="kw">pub struct </span>Compiler { |
| size_limit: usize, |
| insts: Vec<Inst>, |
| } |
| |
| <span class="kw">impl </span>Compiler { |
| <span class="kw">pub fn </span>new(size_limit: usize) -> Compiler { |
| Compiler { |
| size_limit, |
| insts: <span class="macro">vec!</span>[], |
| } |
| } |
| |
| <span class="kw">pub fn </span>compile(<span class="kw-2">mut </span><span class="self">self</span>, hir: <span class="kw-2">&</span>Hir) -> <span class="prelude-ty">Result</span><Vec<Inst>, Error> { |
| <span class="self">self</span>.c(hir)<span class="question-mark">?</span>; |
| <span class="self">self</span>.insts.push(Inst::Match); |
| <span class="prelude-val">Ok</span>(<span class="self">self</span>.insts) |
| } |
| |
| <span class="kw">fn </span>c(<span class="kw-2">&mut </span><span class="self">self</span>, hir: <span class="kw-2">&</span>Hir) -> <span class="prelude-ty">Result</span><(), Error> { |
| <span class="kw">match </span>hir.kind() { |
| HirKind::Anchor(<span class="kw">_</span>) => <span class="kw">return </span><span class="prelude-val">Err</span>(Error::NoEmpty), |
| HirKind::WordBoundary(<span class="kw">_</span>) => { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::NoWordBoundary); |
| } |
| HirKind::Literal(literal) => <span class="kw">match </span><span class="kw-2">*</span>literal { |
| Literal::Byte(<span class="kw">_</span>) => <span class="kw">return </span><span class="prelude-val">Err</span>(Error::NoBytes), |
| Literal::Unicode(char) => { |
| <span class="kw">for </span>seq <span class="kw">in </span>Utf8Sequences::new(char, char) { |
| <span class="self">self</span>.compile_utf8_ranges(<span class="kw-2">&</span>seq); |
| } |
| } |
| }, |
| HirKind::Class(class) => <span class="kw">match </span>class { |
| Class::Bytes(<span class="kw">_</span>) => <span class="kw">return </span><span class="prelude-val">Err</span>(Error::NoBytes), |
| Class::Unicode(class_unicode) => <span class="self">self</span>.compile_class(class_unicode)<span class="question-mark">?</span>, |
| }, |
| HirKind::Empty => {} |
| HirKind::Group(group) => <span class="self">self</span>.c(<span class="kw-2">&</span>group.hir)<span class="question-mark">?</span>, |
| HirKind::Concat(hirs) => { |
| <span class="kw">for </span>hir <span class="kw">in </span>hirs { |
| <span class="self">self</span>.c(hir)<span class="question-mark">?</span>; |
| } |
| } |
| HirKind::Alternation(es) => { |
| <span class="kw">if </span>es.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>jmps_to_end = <span class="macro">vec!</span>[]; |
| <span class="kw">for </span>e <span class="kw">in </span><span class="kw-2">&</span>es[<span class="number">0</span>..es.len() - <span class="number">1</span>] { |
| <span class="kw">let </span>split = <span class="self">self</span>.empty_split(); |
| <span class="kw">let </span>j1 = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.c(e)<span class="question-mark">?</span>; |
| jmps_to_end.push(<span class="self">self</span>.empty_jump()); |
| <span class="kw">let </span>j2 = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.set_split(split, j1, j2); |
| } |
| <span class="self">self</span>.c(<span class="kw-2">&</span>es[es.len() - <span class="number">1</span>])<span class="question-mark">?</span>; |
| <span class="kw">let </span>end = <span class="self">self</span>.insts.len(); |
| <span class="kw">for </span>jmp_to_end <span class="kw">in </span>jmps_to_end { |
| <span class="self">self</span>.set_jump(jmp_to_end, end); |
| } |
| } |
| HirKind::Repetition(repetition) => { |
| <span class="kw">if </span>repetition.greedy == <span class="bool-val">false </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::NoLazy); |
| } |
| <span class="kw">match </span><span class="kw-2">&</span>repetition.kind { |
| RepetitionKind::ZeroOrOne => { |
| <span class="kw">let </span>split = <span class="self">self</span>.empty_split(); |
| <span class="kw">let </span>j1 = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.c(<span class="kw-2">&</span>repetition.hir)<span class="question-mark">?</span>; |
| <span class="kw">let </span>j2 = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.set_split(split, j1, j2); |
| } |
| RepetitionKind::ZeroOrMore => { |
| <span class="kw">let </span>j1 = <span class="self">self</span>.insts.len(); |
| <span class="kw">let </span>split = <span class="self">self</span>.empty_split(); |
| <span class="kw">let </span>j2 = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.c(<span class="kw-2">&</span>repetition.hir)<span class="question-mark">?</span>; |
| <span class="kw">let </span>jmp = <span class="self">self</span>.empty_jump(); |
| <span class="kw">let </span>j3 = <span class="self">self</span>.insts.len(); |
| |
| <span class="self">self</span>.set_jump(jmp, j1); |
| <span class="self">self</span>.set_split(split, j2, j3); |
| } |
| RepetitionKind::OneOrMore => { |
| <span class="kw">let </span>j1 = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.c(<span class="kw-2">&</span>repetition.hir)<span class="question-mark">?</span>; |
| <span class="kw">let </span>split = <span class="self">self</span>.empty_split(); |
| <span class="kw">let </span>j2 = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.set_split(split, j1, j2); |
| } |
| RepetitionKind::Range(range) => <span class="kw">match </span><span class="kw-2">*</span>range { |
| RepetitionRange::AtLeast(min) | RepetitionRange::Exactly(min) => { |
| <span class="kw">for _ in </span><span class="number">0</span>..min { |
| <span class="self">self</span>.c(<span class="kw-2">&</span>repetition.hir)<span class="question-mark">?</span>; |
| } |
| <span class="self">self</span>.c(<span class="kw-2">&</span>Hir::repetition(Repetition { |
| kind: RepetitionKind::ZeroOrMore, |
| greedy: <span class="bool-val">true</span>, |
| hir: repetition.hir.clone(), |
| }))<span class="question-mark">?</span>; |
| } |
| RepetitionRange::Bounded(min, max) => { |
| <span class="kw">for _ in </span><span class="number">0</span>..min { |
| <span class="self">self</span>.c(<span class="kw-2">&</span>repetition.hir)<span class="question-mark">?</span>; |
| } |
| <span class="kw">let </span>(<span class="kw-2">mut </span>splits, <span class="kw-2">mut </span>starts) = (<span class="macro">vec!</span>[], <span class="macro">vec!</span>[]); |
| <span class="kw">for _ in </span>min..max { |
| splits.push(<span class="self">self</span>.empty_split()); |
| starts.push(<span class="self">self</span>.insts.len()); |
| <span class="self">self</span>.c(<span class="kw-2">&</span>repetition.hir)<span class="question-mark">?</span>; |
| } |
| <span class="kw">let </span>end = <span class="self">self</span>.insts.len(); |
| <span class="kw">for </span>(split, start) <span class="kw">in </span>splits.into_iter().zip(starts) { |
| <span class="self">self</span>.set_split(split, start, end); |
| } |
| } |
| }, |
| } |
| } |
| } |
| <span class="self">self</span>.check_size() |
| } |
| |
| <span class="kw">fn </span>compile_class(<span class="kw-2">&mut </span><span class="self">self</span>, class: <span class="kw-2">&</span>ClassUnicode) -> <span class="prelude-ty">Result</span><(), Error> { |
| <span class="kw">if </span>class.ranges().is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>jmps = <span class="macro">vec!</span>[]; |
| <span class="kw">for </span><span class="kw-2">&</span>r <span class="kw">in </span><span class="kw-2">&</span>class.ranges()[<span class="number">0</span>..class.ranges().len() - <span class="number">1</span>] { |
| <span class="kw">let </span>split = <span class="self">self</span>.empty_split(); |
| <span class="kw">let </span>j1 = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.compile_class_range(r)<span class="question-mark">?</span>; |
| jmps.push(<span class="self">self</span>.empty_jump()); |
| <span class="kw">let </span>j2 = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.set_split(split, j1, j2); |
| } |
| <span class="self">self</span>.compile_class_range(<span class="kw-2">*</span>class.ranges().last().unwrap())<span class="question-mark">?</span>; |
| <span class="kw">let </span>end = <span class="self">self</span>.insts.len(); |
| <span class="kw">for </span>jmp <span class="kw">in </span>jmps { |
| <span class="self">self</span>.set_jump(jmp, end); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>compile_class_range(<span class="kw-2">&mut </span><span class="self">self</span>, char_range: ClassUnicodeRange) -> <span class="prelude-ty">Result</span><(), Error> { |
| <span class="kw">let </span><span class="kw-2">mut </span>it = Utf8Sequences::new(char_range.start(), char_range.end()).peekable(); |
| <span class="kw">let </span><span class="kw-2">mut </span>jmps = <span class="macro">vec!</span>[]; |
| <span class="kw">let </span><span class="kw-2">mut </span>utf8_ranges = it.next().expect(<span class="string">"non-empty char class"</span>); |
| <span class="kw">while </span>it.peek().is_some() { |
| <span class="kw">let </span>split = <span class="self">self</span>.empty_split(); |
| <span class="kw">let </span>j1 = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.compile_utf8_ranges(<span class="kw-2">&</span>utf8_ranges); |
| jmps.push(<span class="self">self</span>.empty_jump()); |
| <span class="kw">let </span>j2 = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.set_split(split, j1, j2); |
| utf8_ranges = it.next().unwrap(); <span class="comment">// because peek says so |
| </span>} |
| <span class="self">self</span>.compile_utf8_ranges(<span class="kw-2">&</span>utf8_ranges); |
| <span class="kw">let </span>end = <span class="self">self</span>.insts.len(); |
| <span class="kw">for </span>jmp <span class="kw">in </span>jmps { |
| <span class="self">self</span>.set_jump(jmp, end); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>compile_utf8_ranges(<span class="kw-2">&mut </span><span class="self">self</span>, utf8_ranges: <span class="kw-2">&</span>Utf8Sequence) { |
| <span class="kw">for </span>r <span class="kw">in </span>utf8_ranges { |
| <span class="self">self</span>.push(Inst::Range(r.start, r.end)); |
| } |
| } |
| |
| <span class="kw">fn </span>check_size(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><(), Error> { |
| <span class="kw">use </span>std::mem::size_of; |
| |
| <span class="kw">if </span><span class="self">self</span>.insts.len() * size_of::<Inst>() > <span class="self">self</span>.size_limit { |
| <span class="prelude-val">Err</span>(Error::CompiledTooBig(<span class="self">self</span>.size_limit)) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="doccomment">/// Appends the given instruction to the program. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>push(<span class="kw-2">&mut </span><span class="self">self</span>, x: Inst) { |
| <span class="self">self</span>.insts.push(x) |
| } |
| |
| <span class="doccomment">/// Appends an *empty* `Split` instruction to the program and returns |
| /// the index of that instruction. (The index can then be used to "patch" |
| /// the actual locations of the split in later.) |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>empty_split(<span class="kw-2">&mut </span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.insts.push(Inst::Split(<span class="number">0</span>, <span class="number">0</span>)); |
| <span class="self">self</span>.insts.len() - <span class="number">1 |
| </span>} |
| |
| <span class="doccomment">/// Sets the left and right locations of a `Split` instruction at index |
| /// `i` to `pc1` and `pc2`, respectively. |
| /// If the instruction at index `i` isn't a `Split` instruction, then |
| /// `panic!` is called. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>set_split(<span class="kw-2">&mut </span><span class="self">self</span>, i: usize, pc1: usize, pc2: usize) { |
| <span class="kw">let </span>split = <span class="kw-2">&mut </span><span class="self">self</span>.insts[i]; |
| <span class="kw">match </span><span class="kw-2">*</span>split { |
| Inst::Split(<span class="kw">_</span>, <span class="kw">_</span>) => <span class="kw-2">*</span>split = Inst::Split(pc1, pc2), |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"BUG: Invalid split index."</span>), |
| } |
| } |
| |
| <span class="doccomment">/// Appends an *empty* `Jump` instruction to the program and returns the |
| /// index of that instruction. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>empty_jump(<span class="kw-2">&mut </span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.insts.push(Inst::Jump(<span class="number">0</span>)); |
| <span class="self">self</span>.insts.len() - <span class="number">1 |
| </span>} |
| |
| <span class="doccomment">/// Sets the location of a `Jump` instruction at index `i` to `pc`. |
| /// If the instruction at index `i` isn't a `Jump` instruction, then |
| /// `panic!` is called. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>set_jump(<span class="kw-2">&mut </span><span class="self">self</span>, i: usize, pc: usize) { |
| <span class="kw">let </span>jmp = <span class="kw-2">&mut </span><span class="self">self</span>.insts[i]; |
| <span class="kw">match </span><span class="kw-2">*</span>jmp { |
| Inst::Jump(<span class="kw">_</span>) => <span class="kw-2">*</span>jmp = Inst::Jump(pc), |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"BUG: Invalid jump index."</span>), |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="tantivy_fst" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
