| <!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/combine-4.6.6/src/error.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>error.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="../../combine/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="../../combine/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="1076">1076</span> |
| <span id="1077">1077</span> |
| <span id="1078">1078</span> |
| <span id="1079">1079</span> |
| <span id="1080">1080</span> |
| <span id="1081">1081</span> |
| <span id="1082">1082</span> |
| <span id="1083">1083</span> |
| <span id="1084">1084</span> |
| <span id="1085">1085</span> |
| <span id="1086">1086</span> |
| <span id="1087">1087</span> |
| <span id="1088">1088</span> |
| <span id="1089">1089</span> |
| <span id="1090">1090</span> |
| <span id="1091">1091</span> |
| <span id="1092">1092</span> |
| <span id="1093">1093</span> |
| <span id="1094">1094</span> |
| <span id="1095">1095</span> |
| <span id="1096">1096</span> |
| <span id="1097">1097</span> |
| <span id="1098">1098</span> |
| <span id="1099">1099</span> |
| <span id="1100">1100</span> |
| <span id="1101">1101</span> |
| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::lib::fmt; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">use </span>std::error::Error <span class="kw">as </span>StdError; |
| |
| <span class="kw">use crate</span>::{stream::StreamOnce, ErrorOffset}; |
| |
| <span class="kw">use </span><span class="self">self</span>::ParseResult::<span class="kw-2">*</span>; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>ResultExt<E, T> { |
| <span class="kw">fn </span>committed(<span class="self">self</span>) -> ParseResult<E, T>; |
| } |
| |
| <span class="kw">impl</span><E, T> ResultExt<E, T> <span class="kw">for </span><span class="prelude-ty">Result</span><E, T> { |
| <span class="kw">fn </span>committed(<span class="self">self</span>) -> ParseResult<E, T> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| <span class="prelude-val">Ok</span>(x) => CommitOk(x), |
| <span class="prelude-val">Err</span>(x) => CommitErr(x), |
| } |
| } |
| } |
| |
| <span class="attribute">#[macro_export] |
| #[doc(hidden)] |
| </span><span class="macro">macro_rules! </span>ctry { |
| (<span class="macro-nonterminal">$result</span>:expr) => { |
| <span class="kw">match </span><span class="macro-nonterminal">$result </span>{ |
| <span class="macro-nonterminal">$crate::error::ParseResult::CommitOk</span>(x) => (x, <span class="macro-nonterminal">$crate::error::Commit::Commit</span>(())), |
| <span class="macro-nonterminal">$crate::error::ParseResult::PeekOk</span>(x) => (x, <span class="macro-nonterminal">$crate::error::Commit::Peek</span>(())), |
| <span class="macro-nonterminal">$crate::error::ParseResult::CommitErr</span>(err) => { |
| <span class="kw">return </span><span class="macro-nonterminal">$crate::error::ParseResult::CommitErr</span>(err.into()) |
| } |
| <span class="macro-nonterminal">$crate::error::ParseResult::PeekErr</span>(err) => { |
| <span class="kw">return </span><span class="macro-nonterminal">$crate::error::ParseResult::PeekErr</span>(err.into()) |
| } |
| } |
| }; |
| } |
| |
| <span class="doccomment">/// Trait for types which can be used to construct error information. |
| /// |
| /// To call functions expecting this trait, use the wrapper types defined in this module |
| /// `Token`, `Range`, `Format` or `Static`/`&'static str` |
| </span><span class="kw">pub trait </span>ErrorInfo<<span class="lifetime">'s</span>, T, R> { |
| <span class="kw">type </span>Format: fmt::Display; |
| |
| <span class="attribute">#[allow(clippy::wrong_self_convention)] |
| </span><span class="kw">fn </span>into_info(<span class="kw-2">&</span><span class="lifetime">'s </span><span class="self">self</span>) -> Info<T, R, <span class="self">Self</span>::Format>; |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, <span class="lifetime">'a</span>, T, R, F> ErrorInfo<<span class="lifetime">'s</span>, T, R> <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>F |
| <span class="kw">where |
| </span>F: ErrorInfo<<span class="lifetime">'s</span>, T, R>, |
| { |
| <span class="kw">type </span>Format = F::Format; |
| <span class="kw">fn </span>into_info(<span class="kw-2">&</span><span class="lifetime">'s </span><span class="self">self</span>) -> Info<T, R, <span class="self">Self</span>::Format> { |
| (<span class="kw-2">**</span><span class="self">self</span>).into_info() |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub enum </span>Info<T, R, F = <span class="kw-2">&</span><span class="lifetime">'static </span>str> { |
| Token(T), |
| Range(R), |
| Static(<span class="kw-2">&</span><span class="lifetime">'static </span>str), |
| Format(F), |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, T, R, F> ErrorInfo<<span class="lifetime">'s</span>, T, R> <span class="kw">for </span>Info<T, R, F> |
| <span class="kw">where |
| </span>T: Clone, |
| R: Clone, |
| F: fmt::Display + <span class="lifetime">'s</span>, |
| { |
| <span class="kw">type </span>Format = <span class="kw-2">&</span><span class="lifetime">'s </span>F; |
| <span class="kw">fn </span>into_info(<span class="kw-2">&</span><span class="lifetime">'s </span><span class="self">self</span>) -> Info<T, R, <<span class="self">Self </span><span class="kw">as </span>ErrorInfo<<span class="lifetime">'_</span>, T, R>>::Format> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Info::Token(b) => Info::Token(b.clone()), |
| Info::Range(b) => Info::Range(b.clone()), |
| Info::Static(b) => Info::Static(<span class="kw-2">*</span>b), |
| Info::Format(b) => Info::Format(b), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><R, F> From<char> <span class="kw">for </span>Info<char, R, F> { |
| <span class="kw">fn </span>from(s: char) -> <span class="self">Self </span>{ |
| Info::Token(s) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, R> ErrorInfo<<span class="lifetime">'s</span>, char, R> <span class="kw">for </span>char { |
| <span class="kw">type </span>Format = <span class="kw-2">&</span><span class="lifetime">'static </span>str; |
| <span class="kw">fn </span>into_info(<span class="kw-2">&</span><span class="self">self</span>) -> Info<char, R, <span class="self">Self</span>::Format> { |
| Info::Token(<span class="kw-2">*</span><span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T, R, F> From<<span class="kw-2">&</span><span class="lifetime">'static </span>str> <span class="kw">for </span>Info<T, R, F> { |
| <span class="kw">fn </span>from(s: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="self">Self </span>{ |
| Info::Static(s) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, T, R> ErrorInfo<<span class="lifetime">'s</span>, T, R> <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'static </span>str { |
| <span class="kw">type </span>Format = <span class="kw-2">&</span><span class="lifetime">'static </span>str; |
| <span class="kw">fn </span>into_info(<span class="kw-2">&</span><span class="self">self</span>) -> Info<T, R, <span class="self">Self</span>::Format> { |
| Info::Static(<span class="kw-2">*</span><span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><R, F> From<u8> <span class="kw">for </span>Info<u8, R, F> { |
| <span class="kw">fn </span>from(s: u8) -> <span class="self">Self </span>{ |
| Info::Token(s) |
| } |
| } |
| |
| <span class="kw">impl</span><R> ErrorInfo<<span class="lifetime">'_</span>, <span class="self">Self</span>, R> <span class="kw">for </span>u8 { |
| <span class="kw">type </span>Format = <span class="kw-2">&</span><span class="lifetime">'static </span>str; |
| <span class="kw">fn </span>into_info(<span class="kw-2">&</span><span class="self">self</span>) -> Info<<span class="self">Self</span>, R, <span class="self">Self</span>::Format> { |
| Info::Token(<span class="kw-2">*</span><span class="self">self</span>) |
| } |
| } |
| |
| <span class="doccomment">/// Newtype which constructs an `Info::Token` through `ErrorInfo` |
| </span><span class="kw">pub struct </span>Token<T>(<span class="kw">pub </span>T); |
| |
| <span class="kw">impl</span><T, R> From<Token<T>> <span class="kw">for </span>Info<T, R, <span class="kw-2">&</span><span class="lifetime">'static </span>str> { |
| <span class="kw">fn </span>from(s: Token<T>) -> <span class="self">Self </span>{ |
| Info::Token(s.<span class="number">0</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, T, R> ErrorInfo<<span class="lifetime">'s</span>, T, R> <span class="kw">for </span>Token<T> |
| <span class="kw">where |
| </span>T: Clone, |
| { |
| <span class="kw">type </span>Format = <span class="kw-2">&</span><span class="lifetime">'static </span>str; |
| <span class="kw">fn </span>into_info(<span class="kw-2">&</span><span class="lifetime">'s </span><span class="self">self</span>) -> Info<T, R, <span class="self">Self</span>::Format> { |
| Info::Token(<span class="self">self</span>.<span class="number">0</span>.clone()) |
| } |
| } |
| |
| <span class="doccomment">/// Newtype which constructs an `Info::Range` through `ErrorInfo` |
| </span><span class="kw">pub struct </span>Range<R>(<span class="kw">pub </span>R); |
| |
| <span class="kw">impl</span><T, R> From<Range<R>> <span class="kw">for </span>Info<T, R, <span class="kw-2">&</span><span class="lifetime">'static </span>str> { |
| <span class="kw">fn </span>from(s: Range<R>) -> <span class="self">Self </span>{ |
| Info::Range(s.<span class="number">0</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, T, R> ErrorInfo<<span class="lifetime">'s</span>, T, R> <span class="kw">for </span>Range<R> |
| <span class="kw">where |
| </span>R: Clone, |
| { |
| <span class="kw">type </span>Format = <span class="kw-2">&</span><span class="lifetime">'static </span>str; |
| <span class="kw">fn </span>into_info(<span class="kw-2">&</span><span class="lifetime">'s </span><span class="self">self</span>) -> Info<T, R, <span class="self">Self</span>::Format> { |
| Info::Range(<span class="self">self</span>.<span class="number">0</span>.clone()) |
| } |
| } |
| |
| <span class="doccomment">/// Newtype which constructs an `Info::Static` through `ErrorInfo` |
| /// A plain `&'static str` can also be used, this exists for consistency. |
| </span><span class="kw">pub struct </span>Static(<span class="kw-2">&</span><span class="lifetime">'static </span>str); |
| |
| <span class="kw">impl</span><T, R, F> From<Static> <span class="kw">for </span>Info<T, R, F> |
| <span class="kw">where |
| </span>F: fmt::Display, |
| { |
| <span class="kw">fn </span>from(s: Static) -> <span class="self">Self </span>{ |
| Info::Static(s.<span class="number">0</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, T, R> ErrorInfo<<span class="lifetime">'s</span>, T, R> <span class="kw">for </span>Static { |
| <span class="kw">type </span>Format = <span class="kw-2">&</span><span class="lifetime">'static </span>str; |
| <span class="kw">fn </span>into_info(<span class="kw-2">&</span><span class="lifetime">'s </span><span class="self">self</span>) -> Info<T, R, <span class="self">Self</span>::Format> { |
| Info::Static(<span class="self">self</span>.<span class="number">0</span>) |
| } |
| } |
| |
| <span class="doccomment">/// Newtype which constructs an `Info::Format` through `ErrorInfo` |
| </span><span class="kw">pub struct </span>Format<F>(<span class="kw">pub </span>F) |
| <span class="kw">where |
| </span>F: fmt::Display; |
| |
| <span class="kw">impl</span><T, R, F> From<Format<F>> <span class="kw">for </span>Info<T, R, F> |
| <span class="kw">where |
| </span>F: fmt::Display, |
| { |
| <span class="kw">fn </span>from(s: Format<F>) -> <span class="self">Self </span>{ |
| Info::Format(s.<span class="number">0</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, T, R, F> ErrorInfo<<span class="lifetime">'s</span>, T, R> <span class="kw">for </span>Format<F> |
| <span class="kw">where |
| </span>F: fmt::Display + <span class="lifetime">'s</span>, |
| { |
| <span class="kw">type </span>Format = <span class="kw-2">&</span><span class="lifetime">'s </span>F; |
| <span class="kw">fn </span>into_info(<span class="kw-2">&</span><span class="lifetime">'s </span><span class="self">self</span>) -> Info<T, R, <span class="self">Self</span>::Format> { |
| Info::Format(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>) |
| } |
| } |
| |
| <span class="doccomment">/// Enum used to indicate if a parser committed any items of the stream it was given as an input. |
| /// |
| /// This is used by parsers such as `or` and `choice` to determine if they should try to parse |
| /// with another parser as they will only be able to provide good error reporting if the preceding |
| /// parser did not commit to the parse. |
| </span><span class="attribute">#[derive(Clone, PartialEq, Debug, Copy)] |
| </span><span class="kw">pub enum </span>Commit<T> { |
| <span class="doccomment">/// Constructor indicating that the parser has committed to this parse. If a parser after this fails, |
| /// other parser alternatives will not be attempted (`CommitErr` will be returned) |
| </span>Commit(T), |
| <span class="doccomment">/// Constructor indicating that the parser has not committed to this parse. If a parser after this fails, |
| /// other parser alternatives will be attempted (`EmptyErr` will be returned) |
| </span>Peek(T), |
| } |
| |
| <span class="kw">impl</span><T> AsMut<T> <span class="kw">for </span>Commit<T> { |
| <span class="kw">fn </span>as_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>T { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Commit::Peek(<span class="kw-2">ref mut </span>t) | Commit::Commit(<span class="kw-2">ref mut </span>t) => t, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T> AsRef<T> <span class="kw">for </span>Commit<T> { |
| <span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>T { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Commit::Peek(<span class="kw-2">ref </span>t) | Commit::Commit(<span class="kw-2">ref </span>t) => t, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T> Commit<T> { |
| <span class="doccomment">/// Returns true if `self` is peek. |
| </span><span class="kw">pub fn </span>is_peek(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Commit::Peek(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| Commit::Commit(<span class="kw">_</span>) => <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Extracts the contained value. |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> T { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Commit::Peek(x) | Commit::Commit(x) => x, |
| } |
| } |
| |
| <span class="doccomment">/// Converts `self` into the `Commit` state. |
| </span><span class="kw">pub fn </span>into_commit(<span class="self">self</span>) -> Commit<T> { |
| Commit::Commit(<span class="self">self</span>.into_inner()) |
| } |
| |
| <span class="doccomment">/// Converts `self` into the `Peek` state. |
| </span><span class="kw">pub fn </span>into_peek(<span class="self">self</span>) -> Commit<T> { |
| Commit::Peek(<span class="self">self</span>.into_inner()) |
| } |
| |
| <span class="doccomment">/// Maps over the contained value without changing the committed state. |
| </span><span class="kw">pub fn </span>map<F, U>(<span class="self">self</span>, f: F) -> Commit<U> |
| <span class="kw">where |
| </span>F: FnOnce(T) -> U, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Commit::Peek(x) => Commit::Peek(f(x)), |
| Commit::Commit(x) => Commit::Commit(f(x)), |
| } |
| } |
| |
| <span class="kw">pub fn </span>merge(<span class="kw-2">&</span><span class="self">self</span>, current: Commit<T>) -> Commit<T> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Commit::Peek(<span class="kw">_</span>) => current, |
| Commit::Commit(<span class="kw">_</span>) => current.into_commit(), |
| } |
| } |
| |
| <span class="doccomment">/// Combines the `Commit` flags from `self` and the result of `f`. |
| /// |
| /// ```text |
| /// Peek <> Peek -> Peek |
| /// Commit <> Peek -> Commit |
| /// Peek <> Commit -> Commit |
| /// Commit <> Commit -> Commit |
| /// ``` |
| /// |
| /// ``` |
| /// # extern crate combine as pc; |
| /// # use pc::*; |
| /// # fn main() { |
| /// //Parses a character of string literal and handles the escaped characters \\ and \" as \ |
| /// //and " respectively |
| /// fn char<Input>(input: &mut Input) -> StdParseResult<char, Input> |
| /// where Input: Stream<Token = char>, |
| /// Input::Error: ParseError<Input::Token, Input::Range, Input::Position>, |
| /// { |
| /// let (c, committed) = satisfy(|c| c != '"').parse_stream(input).into_result()?; |
| /// match c { |
| /// //Since the `char` parser has already committed some of the input `combine` is used |
| /// //propagate the committed state to the next part of the parser |
| /// '\\' => committed.combine(|_| { |
| /// satisfy(|c| c == '"' || c == '\\') |
| /// .map(|c| { |
| /// match c { |
| /// '"' => '"', |
| /// '\\' => '\\', |
| /// c => c |
| /// } |
| /// }) |
| /// .parse_stream(input) |
| /// .into_result() |
| /// }), |
| /// _ => Ok((c, committed)) |
| /// } |
| /// } |
| /// let result = many(parser(char)) |
| /// .easy_parse(r#"abc\"\\"#); |
| /// assert_eq!(result, Ok((r#"abc"\"#.to_string(), ""))); |
| /// } |
| /// ``` |
| </span><span class="kw">pub fn </span>combine<F, U, E>(<span class="self">self</span>, f: F) -> StdParseResult2<U, E> |
| <span class="kw">where |
| </span>F: FnOnce(T) -> StdParseResult2<U, E>, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Commit::Commit(x) => <span class="kw">match </span>f(x) { |
| <span class="prelude-val">Ok</span>((v, Commit::Peek(()))) => <span class="prelude-val">Ok</span>((v, Commit::Commit(()))), |
| <span class="prelude-val">Err</span>(Commit::Peek(err)) => <span class="prelude-val">Err</span>(Commit::Commit(err)), |
| y => y, |
| }, |
| Commit::Peek(x) => f(x), |
| } |
| } |
| <span class="kw">pub fn </span>combine_commit<F, U, E>(<span class="self">self</span>, f: F) -> ParseResult<U, E> |
| <span class="kw">where |
| </span>F: FnOnce(T) -> ParseResult<U, E>, |
| { |
| <span class="kw">use </span><span class="self">self</span>::ParseResult::<span class="kw-2">*</span>; |
| |
| <span class="kw">match </span><span class="self">self </span>{ |
| Commit::Commit(x) => <span class="kw">match </span>f(x) { |
| PeekOk(v) => CommitOk(v), |
| PeekErr(err) => CommitErr(err.error), |
| y => y, |
| }, |
| Commit::Peek(x) => f(x), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A type alias over the specific `Result` type used by parsers to indicate whether they were |
| /// successful or not. |
| /// `O` is the type that is output on success. |
| /// `Input` is the specific stream type used in the parser. |
| </span><span class="kw">pub type </span>StdParseResult<O, Input> = |
| <span class="prelude-ty">Result</span><(O, Commit<()>), Commit<Tracked<<Input <span class="kw">as </span>StreamOnce>::Error>>>; |
| <span class="kw">pub type </span>StdParseResult2<O, E> = <span class="prelude-ty">Result</span><(O, Commit<()>), Commit<Tracked<E>>>; |
| |
| <span class="doccomment">/// `StreamError` represents a single error returned from a `Stream` or a `Parser`. |
| /// |
| /// Usually multiple instances of `StreamError` is composed into a `ParseError` to build the final |
| /// error value. |
| </span><span class="kw">pub trait </span>StreamError<Item, Range>: Sized { |
| <span class="kw">fn </span>unexpected_token(token: Item) -> <span class="self">Self</span>; |
| <span class="kw">fn </span>unexpected_range(token: Range) -> <span class="self">Self</span>; |
| <span class="kw">fn </span>unexpected_format<T>(msg: T) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>T: fmt::Display; |
| <span class="kw">fn </span>unexpected<E>(info: E) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>E: <span class="kw">for</span><<span class="lifetime">'s</span>> ErrorInfo<<span class="lifetime">'s</span>, Item, Range>, |
| { |
| <span class="kw">match </span>info.into_info() { |
| Info::Token(b) => <span class="self">Self</span>::unexpected_token(b), |
| Info::Range(b) => <span class="self">Self</span>::unexpected_range(b), |
| Info::Static(b) => <span class="self">Self</span>::unexpected_static_message(b), |
| Info::Format(b) => <span class="self">Self</span>::unexpected_format(b), |
| } |
| } |
| <span class="kw">fn </span>unexpected_static_message(msg: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::unexpected_format(msg) |
| } |
| |
| <span class="kw">fn </span>expected_token(token: Item) -> <span class="self">Self</span>; |
| <span class="kw">fn </span>expected_range(token: Range) -> <span class="self">Self</span>; |
| <span class="kw">fn </span>expected_format<T>(msg: T) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>T: fmt::Display; |
| <span class="kw">fn </span>expected<E>(info: E) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>E: <span class="kw">for</span><<span class="lifetime">'s</span>> ErrorInfo<<span class="lifetime">'s</span>, Item, Range>, |
| { |
| <span class="kw">match </span>info.into_info() { |
| Info::Token(b) => <span class="self">Self</span>::expected_token(b), |
| Info::Range(b) => <span class="self">Self</span>::expected_range(b), |
| Info::Static(b) => <span class="self">Self</span>::expected_static_message(b), |
| Info::Format(b) => <span class="self">Self</span>::expected_format(b), |
| } |
| } |
| <span class="kw">fn </span>expected_static_message(msg: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::expected_format(msg) |
| } |
| |
| <span class="kw">fn </span>message_token(token: Item) -> <span class="self">Self</span>; |
| <span class="kw">fn </span>message_range(token: Range) -> <span class="self">Self</span>; |
| <span class="kw">fn </span>message_format<T>(msg: T) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>T: fmt::Display; |
| <span class="kw">fn </span>message_static_message(msg: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::message_format(msg) |
| } |
| <span class="kw">fn </span>message<E>(info: E) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>E: <span class="kw">for</span><<span class="lifetime">'s</span>> ErrorInfo<<span class="lifetime">'s</span>, Item, Range>, |
| { |
| <span class="kw">match </span>info.into_info() { |
| Info::Token(b) => <span class="self">Self</span>::message_token(b), |
| Info::Range(b) => <span class="self">Self</span>::message_range(b), |
| Info::Static(b) => <span class="self">Self</span>::message_static_message(b), |
| Info::Format(b) => <span class="self">Self</span>::message_format(b), |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">fn </span>other<E>(err: E) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>E: StdError + Send + Sync + <span class="lifetime">'static</span>, |
| { |
| <span class="self">Self</span>::message_format(err) |
| } |
| |
| <span class="kw">fn </span>end_of_input() -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::unexpected_static_message(<span class="string">"end of input"</span>) |
| } |
| |
| <span class="kw">fn </span>is_unexpected_end_of_input(<span class="kw-2">&</span><span class="self">self</span>) -> bool; |
| |
| <span class="doccomment">/// Converts `self` into a different `StreamError` type. |
| /// |
| /// This should aim to preserve as much information as possible into the returned `T` value but |
| /// if `Self` ignores some information passed to it using one of the constructors that |
| /// information is naturally lost. |
| </span><span class="kw">fn </span>into_other<T>(<span class="self">self</span>) -> T |
| <span class="kw">where |
| </span>T: StreamError<Item, Range>; |
| } |
| |
| <span class="doccomment">/// Trait which defines a combine parse error. |
| /// |
| /// A parse error is composed of zero or more `StreamError` instances which gets added to it as |
| /// errors are encountered during parsing. |
| </span><span class="kw">pub trait </span>ParseError<Item, Range, Position>: Sized + PartialEq { |
| <span class="kw">type </span>StreamError: StreamError<Item, Range>; |
| |
| <span class="doccomment">/// Constructs an empty error. |
| /// |
| /// An empty error is expected to be cheap to create as it is frequently created and discarded. |
| </span><span class="kw">fn </span>empty(position: Position) -> <span class="self">Self</span>; |
| |
| <span class="doccomment">/// Creates a `ParseError` from a single `Self::StreamError` |
| </span><span class="kw">fn </span>from_error(position: Position, err: <span class="self">Self</span>::StreamError) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>errors = <span class="self">Self</span>::empty(position); |
| errors.add(err); |
| errors |
| } |
| |
| <span class="kw">fn </span>position(<span class="kw-2">&</span><span class="self">self</span>) -> Position { |
| <span class="comment">// TODO Remove the default implementation in a breaking release |
| </span><span class="macro">unimplemented!</span>() |
| } |
| |
| <span class="doccomment">/// Sets the position of this `ParseError` |
| </span><span class="kw">fn </span>set_position(<span class="kw-2">&mut </span><span class="self">self</span>, position: Position); |
| |
| <span class="doccomment">/// Merges two errors. If they exist at the same position the errors of `other` are |
| /// added to `self` (using the semantics of `add`). If they are not at the same |
| /// position the error furthest ahead are returned, ignoring the other `ParseError`. |
| </span><span class="kw">fn </span>merge(<span class="self">self</span>, other: <span class="self">Self</span>) -> <span class="self">Self </span>{ |
| other |
| } |
| |
| <span class="doccomment">/// Adds a `StreamError` to `self`. |
| /// |
| /// It is up to each individual error type to define what adding an error does, some may push |
| /// it to a vector while others may only keep `self` or `err` to avoid allocation |
| </span><span class="kw">fn </span>add(<span class="kw-2">&mut </span><span class="self">self</span>, err: <span class="self">Self</span>::StreamError); |
| |
| <span class="kw">fn </span>add_expected<E>(<span class="kw-2">&mut </span><span class="self">self</span>, info: E) |
| <span class="kw">where |
| </span>E: <span class="kw">for</span><<span class="lifetime">'s</span>> ErrorInfo<<span class="lifetime">'s</span>, Item, Range>, |
| { |
| <span class="self">self</span>.add(<span class="self">Self</span>::StreamError::expected(info)) |
| } |
| |
| <span class="kw">fn </span>add_unexpected<E>(<span class="kw-2">&mut </span><span class="self">self</span>, info: E) |
| <span class="kw">where |
| </span>E: <span class="kw">for</span><<span class="lifetime">'s</span>> ErrorInfo<<span class="lifetime">'s</span>, Item, Range>, |
| { |
| <span class="self">self</span>.add(<span class="self">Self</span>::StreamError::unexpected(info)) |
| } |
| |
| <span class="kw">fn </span>add_message<E>(<span class="kw-2">&mut </span><span class="self">self</span>, info: E) |
| <span class="kw">where |
| </span>E: <span class="kw">for</span><<span class="lifetime">'s</span>> ErrorInfo<<span class="lifetime">'s</span>, Item, Range>, |
| { |
| <span class="self">self</span>.add(<span class="self">Self</span>::StreamError::message(info)) |
| } |
| |
| <span class="doccomment">/// Sets `info` as the *only* `Expected` error of `self` |
| </span><span class="kw">fn </span>set_expected<F>(self_: <span class="kw-2">&mut </span>Tracked<<span class="self">Self</span>>, info: <span class="self">Self</span>::StreamError, f: F) |
| <span class="kw">where |
| </span>F: FnOnce(<span class="kw-2">&mut </span>Tracked<<span class="self">Self</span>>); |
| |
| <span class="doccomment">/// Removes any expected errors currently in `self` |
| </span><span class="kw">fn </span>clear_expected(<span class="kw-2">&mut </span><span class="self">self</span>) {} |
| |
| <span class="kw">fn </span>is_unexpected_end_of_input(<span class="kw-2">&</span><span class="self">self</span>) -> bool; |
| |
| <span class="doccomment">/// Does a best-effort conversion of `self` into another `ParseError` |
| </span><span class="kw">fn </span>into_other<T>(<span class="self">self</span>) -> T |
| <span class="kw">where |
| </span>T: ParseError<Item, Range, Position>; |
| } |
| |
| <span class="doccomment">/// Defines a conversion between two parse error types. |
| /// |
| /// Like `ParseError::into_other` but with a more general signature |
| /// (This will take the place of `into_other` on breaking release of combine) |
| </span><span class="kw">pub trait </span>ParseErrorInto<Item, Range, Position>: Sized { |
| <span class="kw">fn </span>into_other_error<T, Item2, Range2, Position2>(<span class="self">self</span>) -> T |
| <span class="kw">where |
| </span>T: ParseError<Item2, Range2, Position2>, |
| Item2: From<Item>, |
| Range2: From<Range>, |
| Position2: From<Position>; |
| } |
| |
| <span class="doccomment">/// Defines a conversion between two stream error types. |
| /// |
| /// Like `StreamError::into_other` but with a more general signature |
| /// (This will take the place of `into_other` on breaking release of combine) |
| </span><span class="kw">pub trait </span>StreamErrorInto<Item, Range>: Sized { |
| <span class="kw">fn </span>into_other_error<T, Item2, Range2>(<span class="self">self</span>) -> T |
| <span class="kw">where |
| </span>T: StreamError<Item2, Range2>, |
| Item2: From<Item>, |
| Range2: From<Range>; |
| } |
| |
| <span class="attribute">#[derive(Clone, Copy, Debug, PartialEq)] |
| </span><span class="kw">pub enum </span>UnexpectedParse { |
| Eoi, |
| Unexpected, |
| } |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>UnexpectedParse { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="macro">write!</span>(f, <span class="string">"{}"</span>, <span class="self">self</span>.as_str()) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">impl </span>StdError <span class="kw">for </span>UnexpectedParse { |
| <span class="kw">fn </span>description(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="self">self</span>.as_str() |
| } |
| } |
| |
| <span class="kw">impl </span>UnexpectedParse { |
| <span class="kw">fn </span>as_str(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw">use </span><span class="self">self</span>::UnexpectedParse::<span class="kw-2">*</span>; |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Unexpected => <span class="string">"unexpected parse"</span>, |
| Eoi => <span class="string">"unexpected end of input"</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><Item, Range> StreamError<Item, Range> <span class="kw">for </span>UnexpectedParse { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>unexpected_token(<span class="kw">_</span>: Item) -> <span class="self">Self </span>{ |
| UnexpectedParse::Unexpected |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>unexpected_range(<span class="kw">_</span>: Range) -> <span class="self">Self </span>{ |
| UnexpectedParse::Unexpected |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>unexpected_format<T>(<span class="kw">_</span>: T) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>T: fmt::Display, |
| { |
| UnexpectedParse::Unexpected |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>expected_token(<span class="kw">_</span>: Item) -> <span class="self">Self </span>{ |
| UnexpectedParse::Unexpected |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>expected_range(<span class="kw">_</span>: Range) -> <span class="self">Self </span>{ |
| UnexpectedParse::Unexpected |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>expected_format<T>(<span class="kw">_</span>: T) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>T: fmt::Display, |
| { |
| UnexpectedParse::Unexpected |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>message_format<T>(<span class="kw">_</span>: T) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>T: fmt::Display, |
| { |
| UnexpectedParse::Unexpected |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>message_token(<span class="kw">_</span>: Item) -> <span class="self">Self </span>{ |
| UnexpectedParse::Unexpected |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>message_range(<span class="kw">_</span>: Range) -> <span class="self">Self </span>{ |
| UnexpectedParse::Unexpected |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>end_of_input() -> <span class="self">Self </span>{ |
| UnexpectedParse::Eoi |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>is_unexpected_end_of_input(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw-2">*</span><span class="self">self </span>== UnexpectedParse::Eoi |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>into_other<T>(<span class="self">self</span>) -> T |
| <span class="kw">where |
| </span>T: StreamError<Item, Range>, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| UnexpectedParse::Unexpected => T::unexpected_static_message(<span class="string">"parse"</span>), |
| UnexpectedParse::Eoi => T::end_of_input(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><Item, Range, Position> ParseError<Item, Range, Position> <span class="kw">for </span>UnexpectedParse |
| <span class="kw">where |
| </span>Position: Default, |
| { |
| <span class="kw">type </span>StreamError = <span class="self">Self</span>; |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>empty(_position: Position) -> <span class="self">Self </span>{ |
| UnexpectedParse::Unexpected |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from_error(<span class="kw">_</span>: Position, err: <span class="self">Self</span>::StreamError) -> <span class="self">Self </span>{ |
| err |
| } |
| |
| <span class="kw">fn </span>position(<span class="kw-2">&</span><span class="self">self</span>) -> Position { |
| Position::default() |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>set_position(<span class="kw-2">&mut </span><span class="self">self</span>, _position: Position) {} |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>add(<span class="kw-2">&mut </span><span class="self">self</span>, err: <span class="self">Self</span>::StreamError) { |
| <span class="kw-2">*</span><span class="self">self </span>= <span class="kw">match </span>(<span class="kw-2">*</span><span class="self">self</span>, err) { |
| (UnexpectedParse::Eoi, <span class="kw">_</span>) => UnexpectedParse::Eoi, |
| (<span class="kw">_</span>, err) => err, |
| }; |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>set_expected<F>(self_: <span class="kw-2">&mut </span>Tracked<<span class="self">Self</span>>, info: <span class="self">Self</span>::StreamError, f: F) |
| <span class="kw">where |
| </span>F: FnOnce(<span class="kw-2">&mut </span>Tracked<<span class="self">Self</span>>), |
| { |
| f(self_); |
| self_.error = info; |
| } |
| |
| <span class="kw">fn </span>is_unexpected_end_of_input(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw-2">*</span><span class="self">self </span>== UnexpectedParse::Eoi |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>into_other<T>(<span class="self">self</span>) -> T |
| <span class="kw">where |
| </span>T: ParseError<Item, Range, Position>, |
| { |
| T::from_error(Position::default(), StreamError::into_other(<span class="self">self</span>)) |
| } |
| } |
| |
| <span class="kw">impl</span><Item, Range, Position> ParseErrorInto<Item, Range, Position> <span class="kw">for </span>UnexpectedParse |
| <span class="kw">where |
| </span>Position: Default, |
| { |
| <span class="kw">fn </span>into_other_error<T, Item2, Range2, Position2>(<span class="self">self</span>) -> T |
| <span class="kw">where |
| </span>T: ParseError<Item2, Range2, Position2>, |
| Item2: From<Item>, |
| Range2: From<Range>, |
| Position2: From<Position>, |
| { |
| T::from_error( |
| Position::default().into(), |
| StreamErrorInto::<Item, Range>::into_other_error(<span class="self">self</span>), |
| ) |
| } |
| } |
| |
| <span class="kw">impl</span><Item, Range> StreamErrorInto<Item, Range> <span class="kw">for </span>UnexpectedParse { |
| <span class="kw">fn </span>into_other_error<T, Item2, Range2>(<span class="self">self</span>) -> T |
| <span class="kw">where |
| </span>T: StreamError<Item2, Range2>, |
| Item2: From<Item>, |
| Range2: From<Range>, |
| { |
| StreamError::into_other(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone, Copy, Debug, PartialEq)] |
| </span><span class="kw">pub enum </span>StringStreamError { |
| UnexpectedParse, |
| Eoi, |
| CharacterBoundary, |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>CHAR_BOUNDARY_ERROR_MESSAGE: <span class="kw-2">&</span>str = <span class="string">"unexpected slice on character boundary"</span>; |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>StringStreamError { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="macro">write!</span>(f, <span class="string">"{}"</span>, <span class="self">self</span>.as_str()) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">impl </span>StdError <span class="kw">for </span>StringStreamError { |
| <span class="kw">fn </span>description(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="self">self</span>.as_str() |
| } |
| } |
| |
| <span class="kw">impl </span>StringStreamError { |
| <span class="kw">fn </span>as_str(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw">use </span><span class="self">self</span>::StringStreamError::<span class="kw-2">*</span>; |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| UnexpectedParse => <span class="string">"unexpected parse"</span>, |
| Eoi => <span class="string">"unexpected end of input"</span>, |
| CharacterBoundary => CHAR_BOUNDARY_ERROR_MESSAGE, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><Item, Range> StreamError<Item, Range> <span class="kw">for </span>StringStreamError { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>unexpected_token(<span class="kw">_</span>: Item) -> <span class="self">Self </span>{ |
| StringStreamError::UnexpectedParse |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>unexpected_range(<span class="kw">_</span>: Range) -> <span class="self">Self </span>{ |
| StringStreamError::UnexpectedParse |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>unexpected_format<T>(_msg: T) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>T: fmt::Display, |
| { |
| StringStreamError::UnexpectedParse |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>expected_token(<span class="kw">_</span>: Item) -> <span class="self">Self </span>{ |
| StringStreamError::UnexpectedParse |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>expected_range(<span class="kw">_</span>: Range) -> <span class="self">Self </span>{ |
| StringStreamError::UnexpectedParse |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>expected_format<T>(<span class="kw">_</span>: T) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>T: fmt::Display, |
| { |
| StringStreamError::UnexpectedParse |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>message_format<T>(<span class="kw">_</span>: T) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>T: fmt::Display, |
| { |
| StringStreamError::UnexpectedParse |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>message_token(<span class="kw">_</span>: Item) -> <span class="self">Self </span>{ |
| StringStreamError::UnexpectedParse |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>message_range(<span class="kw">_</span>: Range) -> <span class="self">Self </span>{ |
| StringStreamError::UnexpectedParse |
| } |
| <span class="kw">fn </span>message_static_message(msg: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="self">Self </span>{ |
| <span class="kw">if </span>msg == CHAR_BOUNDARY_ERROR_MESSAGE { |
| StringStreamError::CharacterBoundary |
| } <span class="kw">else </span>{ |
| StringStreamError::UnexpectedParse |
| } |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>end_of_input() -> <span class="self">Self </span>{ |
| StringStreamError::Eoi |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>is_unexpected_end_of_input(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw-2">*</span><span class="self">self </span>== StringStreamError::Eoi |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>into_other<T>(<span class="self">self</span>) -> T |
| <span class="kw">where |
| </span>T: StreamError<Item, Range>, |
| { |
| <span class="kw">let </span>msg = <span class="kw">match </span><span class="self">self </span>{ |
| StringStreamError::CharacterBoundary => CHAR_BOUNDARY_ERROR_MESSAGE, |
| StringStreamError::UnexpectedParse => <span class="string">"parse"</span>, |
| StringStreamError::Eoi => <span class="kw">return </span>T::end_of_input(), |
| }; |
| T::unexpected_static_message(msg) |
| } |
| } |
| <span class="kw">impl</span><Item, Range, Position> ParseError<Item, Range, Position> <span class="kw">for </span>StringStreamError |
| <span class="kw">where |
| </span>Position: Default, |
| { |
| <span class="kw">type </span>StreamError = <span class="self">Self</span>; |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>empty(_position: Position) -> <span class="self">Self </span>{ |
| StringStreamError::UnexpectedParse |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from_error(<span class="kw">_</span>: Position, err: <span class="self">Self</span>::StreamError) -> <span class="self">Self </span>{ |
| err |
| } |
| |
| <span class="kw">fn </span>position(<span class="kw-2">&</span><span class="self">self</span>) -> Position { |
| Position::default() |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>set_position(<span class="kw-2">&mut </span><span class="self">self</span>, _position: Position) {} |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>add(<span class="kw-2">&mut </span><span class="self">self</span>, err: <span class="self">Self</span>::StreamError) { |
| <span class="kw-2">*</span><span class="self">self </span>= <span class="kw">match </span>(<span class="kw-2">*</span><span class="self">self</span>, err) { |
| (StringStreamError::Eoi, <span class="kw">_</span>) => StringStreamError::Eoi, |
| (<span class="kw">_</span>, err) => err, |
| }; |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>set_expected<F>(self_: <span class="kw-2">&mut </span>Tracked<<span class="self">Self</span>>, info: <span class="self">Self</span>::StreamError, f: F) |
| <span class="kw">where |
| </span>F: FnOnce(<span class="kw-2">&mut </span>Tracked<<span class="self">Self</span>>), |
| { |
| f(self_); |
| self_.error = info; |
| } |
| |
| <span class="kw">fn </span>is_unexpected_end_of_input(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw-2">*</span><span class="self">self </span>== StringStreamError::Eoi |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>into_other<T>(<span class="self">self</span>) -> T |
| <span class="kw">where |
| </span>T: ParseError<Item, Range, Position>, |
| { |
| T::from_error(Position::default(), StreamError::into_other(<span class="self">self</span>)) |
| } |
| } |
| |
| <span class="kw">impl</span><Item, Range, Position> ParseErrorInto<Item, Range, Position> <span class="kw">for </span>StringStreamError |
| <span class="kw">where |
| </span>Position: Default, |
| { |
| <span class="kw">fn </span>into_other_error<T, Item2, Range2, Position2>(<span class="self">self</span>) -> T |
| <span class="kw">where |
| </span>T: ParseError<Item2, Range2, Position2>, |
| Item2: From<Item>, |
| Range2: From<Range>, |
| Position2: From<Position>, |
| { |
| T::from_error( |
| Position::default().into(), |
| StreamErrorInto::<Item, Range>::into_other_error(<span class="self">self</span>), |
| ) |
| } |
| } |
| |
| <span class="kw">impl</span><Item, Range> StreamErrorInto<Item, Range> <span class="kw">for </span>StringStreamError { |
| <span class="kw">fn </span>into_other_error<T, Item2, Range2>(<span class="self">self</span>) -> T |
| <span class="kw">where |
| </span>T: StreamError<Item2, Range2>, |
| Item2: From<Item>, |
| Range2: From<Range>, |
| { |
| StreamError::into_other(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="doccomment">/// Error wrapper which lets parsers track which parser in a sequence of sub-parsers has emitted |
| /// the error. `Tracked::from` can be used to construct this and it should otherwise be |
| /// ignored outside of combine. |
| </span><span class="attribute">#[derive(Clone, PartialEq, Debug, Copy)] |
| </span><span class="kw">pub struct </span>Tracked<E> { |
| <span class="doccomment">/// The error returned |
| </span><span class="kw">pub </span>error: E, |
| <span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub </span>offset: ErrorOffset, |
| } |
| |
| <span class="kw">impl</span><E> From<E> <span class="kw">for </span>Tracked<E> { |
| <span class="kw">fn </span>from(error: E) -> <span class="self">Self </span>{ |
| Tracked { |
| error, |
| offset: ErrorOffset(<span class="number">1</span>), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A `Result` type which has the committed status flattened into the result. |
| /// Conversions to and from `std::result::Result` can be done using `result.into()` or |
| /// `From::from(result)` |
| </span><span class="attribute">#[derive(Clone, PartialEq, Debug, Copy)] |
| </span><span class="kw">pub enum </span>ParseResult<T, E> { |
| <span class="doccomment">/// The parser has succeeded and has committed to this parse. If a parser after this fails, |
| /// other parser alternatives will not be attempted (`CommitErr` will be returned) |
| </span>CommitOk(T), |
| <span class="doccomment">/// The parser has succeeded and has not committed to this parse. If a parser after this fails, |
| /// other parser alternatives will be attempted (`PeekErr` will be returned) |
| </span>PeekOk(T), |
| <span class="doccomment">/// The parser failed other parse alternatives will not be attempted. |
| </span>CommitErr(E), |
| <span class="doccomment">/// The parser failed but other parse alternatives may be attempted. |
| </span>PeekErr(Tracked<E>), |
| } |
| |
| <span class="kw">impl</span><T, E> ParseResult<T, E> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_ok(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| CommitOk(<span class="kw">_</span>) | PeekOk(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| CommitErr(<span class="kw">_</span>) | PeekErr(<span class="kw">_</span>) => <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_err(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| !<span class="self">self</span>.is_ok() |
| } |
| |
| <span class="kw">pub fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> ParseResult<<span class="kw-2">&</span>T, <span class="kw-2">&</span>E> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| CommitOk(<span class="kw-2">ref </span>t) => CommitOk(t), |
| PeekOk(<span class="kw-2">ref </span>t) => PeekOk(t), |
| CommitErr(<span class="kw-2">ref </span>e) => CommitErr(e), |
| PeekErr(<span class="kw-2">ref </span>e) => PeekErr(Tracked { |
| error: <span class="kw-2">&</span>e.error, |
| offset: e.offset, |
| }), |
| } |
| } |
| |
| <span class="kw">pub fn </span>and_then<F, T2>(<span class="self">self</span>, f: F) -> F::Output |
| <span class="kw">where |
| </span>F: FnOnce(T) -> ParseResult<T2, E>, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| CommitOk(t) => <span class="kw">match </span>f(t) { |
| CommitOk(t2) | PeekOk(t2) => CommitOk(t2), |
| PeekErr(e) => CommitErr(e.error), |
| CommitErr(e) => CommitErr(e), |
| }, |
| PeekOk(t) => f(t), |
| CommitErr(e) => CommitErr(e), |
| PeekErr(e) => PeekErr(e), |
| } |
| } |
| |
| <span class="kw">pub fn </span>map_err<F, E2>(<span class="self">self</span>, f: F) -> ParseResult<T, F::Output> |
| <span class="kw">where |
| </span>F: FnOnce(E) -> E2, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| CommitOk(t) => CommitOk(t), |
| PeekOk(t) => PeekOk(t), |
| CommitErr(e) => CommitErr(f(e)), |
| PeekErr(e) => PeekErr(Tracked { |
| error: f(e.error), |
| offset: e.offset, |
| }), |
| } |
| } |
| |
| <span class="kw">pub fn </span>map<F, T2>(<span class="self">self</span>, f: F) -> ParseResult<F::Output, E> |
| <span class="kw">where |
| </span>F: FnOnce(T) -> T2, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| CommitOk(t) => CommitOk(f(t)), |
| PeekOk(t) => PeekOk(f(t)), |
| CommitErr(e) => CommitErr(e), |
| PeekErr(e) => PeekErr(e), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><O, E> ParseResult<O, E> { |
| <span class="kw">pub fn </span>into_result(<span class="self">self</span>) -> StdParseResult2<O, E> { |
| <span class="self">self</span>.into() |
| } |
| } |
| |
| <span class="kw">impl</span><T, E> Into<<span class="prelude-ty">Result</span><Commit<T>, Commit<Tracked<E>>>> <span class="kw">for </span>ParseResult<T, E> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>into(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><Commit<T>, Commit<Tracked<E>>> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| CommitOk(t) => <span class="prelude-val">Ok</span>(Commit::Commit(t)), |
| PeekOk(t) => <span class="prelude-val">Ok</span>(Commit::Peek(t)), |
| CommitErr(e) => <span class="prelude-val">Err</span>(Commit::Commit(e.into())), |
| PeekErr(e) => <span class="prelude-val">Err</span>(Commit::Peek(e)), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><O, E> Into<StdParseResult2<O, E>> <span class="kw">for </span>ParseResult<O, E> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>into(<span class="self">self</span>) -> StdParseResult2<O, E> { |
| <span class="kw">use </span><span class="self">self</span>::ParseResult::<span class="kw-2">*</span>; |
| |
| <span class="kw">match </span><span class="self">self </span>{ |
| CommitOk(t) => <span class="prelude-val">Ok</span>((t, Commit::Commit(()))), |
| PeekOk(t) => <span class="prelude-val">Ok</span>((t, Commit::Peek(()))), |
| CommitErr(e) => <span class="prelude-val">Err</span>(Commit::Commit(e.into())), |
| PeekErr(e) => <span class="prelude-val">Err</span>(Commit::Peek(e)), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><O, E> From<StdParseResult2<O, E>> <span class="kw">for </span>ParseResult<O, E> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from(result: StdParseResult2<O, E>) -> ParseResult<O, E> { |
| <span class="kw">use </span><span class="self">self</span>::ParseResult::<span class="kw-2">*</span>; |
| |
| <span class="kw">match </span>result { |
| <span class="prelude-val">Ok</span>((t, Commit::Commit(()))) => CommitOk(t), |
| <span class="prelude-val">Ok</span>((t, Commit::Peek(()))) => PeekOk(t), |
| <span class="prelude-val">Err</span>(Commit::Commit(e)) => CommitErr(e.error), |
| <span class="prelude-val">Err</span>(Commit::Peek(e)) => PeekErr(e), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(feature = <span class="string">"std"</span>, test))] |
| </span><span class="kw">mod </span>tests_std { |
| |
| <span class="kw">use </span><span class="kw">crate</span>::Parser; |
| |
| <span class="attribute">#[derive(Clone, PartialEq, Debug)] |
| </span><span class="kw">struct </span>CloneOnly { |
| s: String, |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_clone_but_not_copy() { |
| <span class="comment">// This verifies we can parse slice references with an token type that is Clone but not Copy. |
| </span><span class="kw">let </span>input = <span class="kw-2">&</span>[ |
| CloneOnly { s: <span class="string">"x"</span>.to_string() }, |
| CloneOnly { s: <span class="string">"y"</span>.to_string() }, |
| ][..]; |
| <span class="kw">let </span>result = <span class="kw">crate</span>::parser::range::take_while(|c: CloneOnly| c.s == <span class="string">"x"</span>).parse(input); |
| <span class="macro">assert_eq!</span>( |
| result, |
| <span class="prelude-val">Ok</span>(( |
| <span class="kw-2">&</span>[CloneOnly { s: <span class="string">"x"</span>.to_string() }][..], |
| <span class="kw-2">&</span>[CloneOnly { s: <span class="string">"y"</span>.to_string() }][..] |
| )) |
| ); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="combine" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
