| <!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/parser/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.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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| </pre><pre class="rust"><code><span class="doccomment">//! A collection of both concrete parsers as well as parser combinators. |
| //! |
| //! Implements the [`Parser`] trait which is the core of `combine` and contains the submodules |
| //! implementing all combine parsers. |
| |
| </span><span class="kw">use crate</span>::{ |
| error::{ |
| ErrorInfo, ParseError, |
| ParseResult::{<span class="self">self</span>, <span class="kw-2">*</span>}, |
| ResultExt, StreamError, Token, Tracked, |
| }, |
| parser::{ |
| combinator::{ |
| and_then, flat_map, map, map_input, spanned, AndThen, Either, FlatMap, Map, MapInput, |
| Spanned, |
| }, |
| error::{expected, message, silent, Expected, Message, Silent}, |
| repeat::Iter, |
| sequence::{then, then_partial, then_ref, Then, ThenPartial, ThenRef}, |
| }, |
| stream::{Stream, StreamErrorFor, StreamOnce}, |
| ErrorOffset, |
| }; |
| |
| <span class="kw">use </span><span class="self">self</span>::{ |
| choice::{or, Or}, |
| sequence::{skip, with, Skip, With}, |
| }; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">use </span>alloc::boxed::Box; |
| |
| <span class="doccomment">/// Internal API. May break without a semver bump |
| </span><span class="attribute">#[macro_export] |
| #[doc(hidden)] |
| </span><span class="macro">macro_rules! </span>parse_mode { |
| (<span class="macro-nonterminal">$input_type</span>: ty) => { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>parse_partial( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&mut </span><span class="macro-nonterminal">$input_type</span>, |
| state: <span class="kw-2">&mut </span><span class="self">Self</span>::PartialState, |
| ) -> <span class="macro-nonterminal">$crate::error::ParseResult</span><<span class="self">Self</span>::Output, <<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::StreamOnce</span>>::Error> { |
| <span class="self">self</span>.parse_mode(<span class="macro-nonterminal">$crate::parser::PartialMode::default</span>(), input, state) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>parse_first( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&mut </span><span class="macro-nonterminal">$input_type</span>, |
| state: <span class="kw-2">&mut </span><span class="self">Self</span>::PartialState, |
| ) -> <span class="macro-nonterminal">$crate::error::ParseResult</span><<span class="self">Self</span>::Output, <<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::StreamOnce</span>>::Error> { |
| <span class="self">self</span>.parse_mode(<span class="macro-nonterminal">$crate::parser::FirstMode</span>, input, state) |
| } |
| }; |
| } |
| |
| <span class="kw">pub mod </span>byte; |
| <span class="kw">pub mod </span>char; |
| <span class="kw">pub mod </span>choice; |
| <span class="kw">pub mod </span>combinator; |
| <span class="kw">pub mod </span>error; |
| <span class="kw">pub mod </span>function; |
| <span class="kw">pub mod </span>range; |
| <span class="attribute">#[cfg(feature = <span class="string">"regex"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"regex"</span>)))] |
| </span><span class="kw">pub mod </span>regex; |
| <span class="kw">pub mod </span>repeat; |
| <span class="kw">pub mod </span>sequence; |
| <span class="kw">pub mod </span>token; |
| |
| <span class="doccomment">/// By implementing the `Parser` trait a type says that it can be used to parse an input stream |
| /// into the type `Output`. |
| /// |
| /// All methods have a default implementation but there needs to be at least an implementation of |
| /// [`parse_stream`], [`parse_stream`], or [`parse_lazy`]. If the last is implemented, an |
| /// implementation of [`add_error`] may also be required. See the documentation for |
| /// [`parse_lazy`] for details. |
| /// |
| /// [`parse_stream`]: trait.Parser.html#method.parse_stream |
| /// [`parse_stream`]: trait.Parser.html#method.parse_stream |
| /// [`parse_lazy`]: trait.Parser.html#method.parse_lazy |
| /// [`add_error`]: trait.Parser.html#method.add_error |
| </span><span class="kw">pub trait </span>Parser<Input: Stream> { |
| <span class="doccomment">/// The type which is returned if the parser is successful. |
| </span><span class="kw">type </span>Output; |
| |
| <span class="doccomment">/// Determines the state necessary to resume parsing after more input is supplied. |
| /// |
| /// If partial parsing is not supported this can be set to `()`. |
| </span><span class="kw">type </span>PartialState: Default; |
| |
| <span class="doccomment">/// Entry point of the parser. Takes some input and tries to parse it. |
| /// |
| /// Returns the parsed result and the remaining input if the parser succeeds, or a |
| /// error otherwise. |
| /// |
| /// This is the most straightforward entry point to a parser. Since it does not decorate the |
| /// input in any way you may find the error messages a hard to read. If that is the case you |
| /// may want to try wrapping your input with an [`easy::Stream`] or call [`easy_parse`] |
| /// instead. |
| /// |
| /// [`easy::Stream`]: super::easy::Stream |
| /// [`easy_parse`]: super::parser::EasyParser::easy_parse |
| </span><span class="kw">fn </span>parse( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| <span class="kw-2">mut </span>input: Input, |
| ) -> <span class="prelude-ty">Result</span><(<span class="self">Self</span>::Output, Input), <Input <span class="kw">as </span>StreamOnce>::Error> { |
| <span class="kw">match </span><span class="self">self</span>.parse_stream(<span class="kw-2">&mut </span>input).into() { |
| <span class="prelude-val">Ok</span>((v, <span class="kw">_</span>)) => <span class="prelude-val">Ok</span>((v, input)), |
| <span class="prelude-val">Err</span>(error) => <span class="prelude-val">Err</span>(error.into_inner().error), |
| } |
| } |
| |
| <span class="doccomment">/// Entry point of the parser when using partial parsing. |
| /// Takes some input and tries to parse it. |
| /// |
| /// Returns the parsed result and the remaining input if the parser succeeds, or a |
| /// error otherwise. |
| </span><span class="kw">fn </span>parse_with_state( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&mut </span>Input, |
| state: <span class="kw-2">&mut </span><span class="self">Self</span>::PartialState, |
| ) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Output, <Input <span class="kw">as </span>StreamOnce>::Error> { |
| <span class="kw">match </span><span class="self">self</span>.parse_stream_partial(input, state).into() { |
| <span class="prelude-val">Ok</span>((v, <span class="kw">_</span>)) => <span class="prelude-val">Ok</span>(v), |
| <span class="prelude-val">Err</span>(error) => <span class="prelude-val">Err</span>(error.into_inner().error), |
| } |
| } |
| |
| <span class="doccomment">/// Parses using the stream `input` by calling [`Stream::uncons`] one or more times. |
| /// |
| /// Semantically equivalent to [`parse_stream`], except this method returns a flattened result |
| /// type, combining `Result` and [`Commit`] into a single [`ParseResult`]. |
| /// |
| /// [`Stream::uncons`]: super::stream::StreamOnce::uncons |
| /// [`parse_stream`]: Parser::parse_stream |
| /// [`Commit`]: super::error::Commit |
| /// [`ParseResult`]: super::error::ParseResult |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>parse_stream( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&mut </span>Input, |
| ) -> ParseResult<<span class="self">Self</span>::Output, <Input <span class="kw">as </span>StreamOnce>::Error> { |
| <span class="kw">let </span>before = input.checkpoint(); |
| <span class="kw">let </span><span class="kw-2">mut </span>state = Default::default(); |
| <span class="kw">let </span><span class="kw-2">mut </span>result = <span class="self">self</span>.parse_first(input, <span class="kw-2">&mut </span>state); |
| <span class="kw">if let </span>ParseResult::PeekErr(<span class="kw-2">ref mut </span>error) = result { |
| <span class="macro">ctry!</span>(input.reset(before.clone()).committed()); |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(t) = input.uncons() { |
| <span class="macro">ctry!</span>(input.reset(before).committed()); |
| error.error.add_unexpected(Token(t)); |
| } <span class="kw">else </span>{ |
| error.error.add(StreamErrorFor::<Input>::end_of_input()); |
| } |
| <span class="self">self</span>.add_error(error); |
| } |
| result |
| } |
| |
| <span class="doccomment">/// Parses using the stream `input` by calling [`Stream::uncons`] one or more times. |
| /// |
| /// Specialized version of [`parse_stream`] which permits error value creation to be |
| /// skipped in the common case. |
| /// |
| /// When this parser returns `PeekErr`, this method is allowed to return an empty |
| /// [`Error`]. The error value that would have been returned can instead be obtained by |
| /// calling [`add_error`]. This allows a parent parser such as `choice` to skip the creation of |
| /// an unnecessary error value, if an alternative parser succeeds. |
| /// |
| /// Parsers should seek to implement this function instead of the above two if errors can be |
| /// encountered before consuming input. The default implementation always returns all errors, |
| /// with [`add_error`] being a no-op. |
| /// |
| /// [`Stream::uncons`]: super::stream::StreamOnce::uncons |
| /// [`parse_stream`]: Parser::parse_stream |
| /// [`Error`]: super::stream::StreamOnce::Error |
| /// [`add_error`]: trait.Parser.html#method.add_error |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>parse_lazy( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&mut </span>Input, |
| ) -> ParseResult<<span class="self">Self</span>::Output, <Input <span class="kw">as </span>StreamOnce>::Error> { |
| <span class="kw">if </span>input.is_partial() { |
| <span class="comment">// If a partial parser were called from a non-partial parser (as it is here) we must |
| // reset the input to before the partial parser were called on errors that committed |
| // data as that parser's partial state was just temporary and it will not be able to |
| // resume itself |
| </span><span class="kw">let </span>before = input.checkpoint(); |
| <span class="kw">let </span>result = <span class="self">self</span>.parse_first(input, <span class="kw-2">&mut </span>Default::default()); |
| <span class="kw">if let </span>CommitErr(<span class="kw">_</span>) = result { |
| <span class="macro">ctry!</span>(input.reset(before).committed()); |
| } |
| result |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.parse_first(input, <span class="kw-2">&mut </span>Default::default()) |
| } |
| } |
| |
| <span class="doccomment">/// Adds the first error that would normally be returned by this parser if it failed with an |
| /// `PeekErr` result. |
| /// |
| /// See [`parse_lazy`] for details. |
| /// |
| /// [`parse_lazy`]: trait.Parser.html#method.parse_lazy |
| </span><span class="kw">fn </span>add_error(<span class="kw-2">&mut </span><span class="self">self</span>, _error: <span class="kw-2">&mut </span>Tracked<<Input <span class="kw">as </span>StreamOnce>::Error>) {} |
| |
| <span class="doccomment">/// Like `parse_stream` but supports partial parsing. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>parse_stream_partial( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&mut </span>Input, |
| state: <span class="kw-2">&mut </span><span class="self">Self</span>::PartialState, |
| ) -> ParseResult<<span class="self">Self</span>::Output, <Input <span class="kw">as </span>StreamOnce>::Error> { |
| <span class="kw">let </span>before = input.checkpoint(); |
| <span class="kw">let </span><span class="kw-2">mut </span>result = <span class="self">self</span>.parse_partial(input, state); |
| <span class="kw">if let </span>ParseResult::PeekErr(<span class="kw-2">ref mut </span>error) = result { |
| <span class="macro">ctry!</span>(input.reset(before.clone()).committed()); |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(t) = input.uncons() { |
| <span class="macro">ctry!</span>(input.reset(before).committed()); |
| error.error.add_unexpected(Token(t)); |
| } <span class="kw">else </span>{ |
| error.error.add(StreamErrorFor::<Input>::end_of_input()); |
| } |
| <span class="self">self</span>.add_error(error); |
| } |
| result |
| } |
| |
| <span class="doccomment">/// Parses using the stream `input` and allows itself to be resumed at a later point using |
| /// `parse_partial` by storing the necessary intermediate state in `state`. |
| /// |
| /// Unlike `parse_partial` function this is allowed to assume that there is no partial state to |
| /// resume. |
| /// |
| /// Internal API. May break without a semver bump |
| /// Always overridden by the `parse_mode!` macro |
| </span><span class="attribute">#[inline] |
| #[doc(hidden)] |
| </span><span class="kw">fn </span>parse_first( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&mut </span>Input, |
| state: <span class="kw-2">&mut </span><span class="self">Self</span>::PartialState, |
| ) -> ParseResult<<span class="self">Self</span>::Output, <Input <span class="kw">as </span>StreamOnce>::Error> { |
| <span class="self">self</span>.parse_partial(input, state) |
| } |
| |
| <span class="doccomment">/// Parses using the stream `input` and allows itself to be resumed at a later point using |
| /// `parse_partial` by storing the necessary intermediate state in `state` |
| /// |
| /// Internal API. May break without a semver bump |
| /// Always overridden by the `parse_mode!` macro |
| </span><span class="attribute">#[inline] |
| #[doc(hidden)] |
| </span><span class="kw">fn </span>parse_partial( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&mut </span>Input, |
| state: <span class="kw-2">&mut </span><span class="self">Self</span>::PartialState, |
| ) -> ParseResult<<span class="self">Self</span>::Output, <Input <span class="kw">as </span>StreamOnce>::Error> { |
| <span class="kw">let _ </span>= state; |
| <span class="self">self</span>.parse_lazy(input) |
| } |
| |
| <span class="doccomment">/// Internal API. May break without a semver bump |
| </span><span class="attribute">#[doc(hidden)] |
| #[inline] |
| </span><span class="kw">fn </span>parse_mode<M>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| mode: M, |
| input: <span class="kw-2">&mut </span>Input, |
| state: <span class="kw-2">&mut </span><span class="self">Self</span>::PartialState, |
| ) -> ParseResult<<span class="self">Self</span>::Output, <Input <span class="kw">as </span>StreamOnce>::Error> |
| <span class="kw">where |
| </span>M: ParseMode, |
| <span class="self">Self</span>: Sized, |
| { |
| mode.parse(<span class="self">self</span>, input, state) |
| } |
| |
| <span class="doccomment">/// Internal API. May break without a semver bump |
| </span><span class="attribute">#[doc(hidden)] |
| #[inline] |
| </span><span class="kw">fn </span>parse_mode_impl<M>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| mode: M, |
| input: <span class="kw-2">&mut </span>Input, |
| state: <span class="kw-2">&mut </span><span class="self">Self</span>::PartialState, |
| ) -> ParseResult<<span class="self">Self</span>::Output, <Input <span class="kw">as </span>StreamOnce>::Error> |
| <span class="kw">where |
| </span>M: ParseMode, |
| <span class="self">Self</span>: Sized, |
| { |
| <span class="kw">if </span>mode.is_first() { |
| <span class="self">self</span>.parse_first(input, state) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.parse_partial(input, state) |
| } |
| } |
| |
| <span class="doccomment">/// Internal API. May break without a semver bump |
| </span><span class="attribute">#[doc(hidden)] |
| #[inline] |
| </span><span class="kw">fn </span>parse_committed_mode<M>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| mode: M, |
| input: <span class="kw-2">&mut </span>Input, |
| state: <span class="kw-2">&mut </span><span class="self">Self</span>::PartialState, |
| ) -> ParseResult<<span class="self">Self</span>::Output, <Input <span class="kw">as </span>StreamOnce>::Error> |
| <span class="kw">where |
| </span>M: ParseMode, |
| <span class="self">Self</span>: Sized, |
| { |
| <span class="kw">if </span>mode.is_first() { |
| FirstMode.parse_committed(<span class="self">self</span>, input, state) |
| } <span class="kw">else </span>{ |
| PartialMode::default().parse_committed(<span class="self">self</span>, input, state) |
| } |
| } |
| |
| <span class="doccomment">/// Returns how many parsers this parser contains |
| /// |
| /// Internal API: This should not be implemented explicitly outside of combine. |
| </span><span class="attribute">#[doc(hidden)] |
| </span><span class="kw">fn </span>parser_count(<span class="kw-2">&</span><span class="self">self</span>) -> ErrorOffset { |
| ErrorOffset(<span class="number">1</span>) |
| } |
| |
| <span class="doccomment">/// Internal API: This should not be implemented explicitly outside of combine. |
| </span><span class="attribute">#[doc(hidden)] |
| </span><span class="kw">fn </span>add_committed_expected_error(<span class="kw-2">&mut </span><span class="self">self</span>, _error: <span class="kw-2">&mut </span>Tracked<<Input <span class="kw">as </span>StreamOnce>::Error>) { |
| } |
| |
| <span class="doccomment">/// Borrows a parser instead of consuming it. |
| /// |
| /// Used to apply parser combinators on `self` without losing ownership. |
| /// |
| /// ``` |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::error::Commit; |
| /// # use combine::parser::char::{digit, letter}; |
| /// fn test(input: &mut &'static str) -> StdParseResult<(char, char), &'static str> { |
| /// let mut p = digit(); |
| /// let ((d, _), committed) = (p.by_ref(), letter()).parse_stream(input).into_result()?; |
| /// let (d2, committed) = committed.combine(|_| p.parse_stream(input).into_result())?; |
| /// Ok(((d, d2), committed)) |
| /// } |
| /// |
| /// fn main() { |
| /// let mut input = "1a23"; |
| /// assert_eq!( |
| /// test(&mut input).map(|(t, c)| (t, c.map(|_| input))), |
| /// Ok((('1', '2'), Commit::Commit("3"))) |
| /// ); |
| /// } |
| /// ``` |
| </span><span class="kw">fn </span>by_ref(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="self">Self |
| </span><span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| { |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Discards the value of the `self` parser and returns the value of `p`. |
| /// Fails if any of the parsers fails. |
| /// |
| /// ``` |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::parser::char::digit; |
| /// # fn main() { |
| /// let result = digit() |
| /// .with(token('i')) |
| /// .parse("9i") |
| /// .map(|x| x.0); |
| /// assert_eq!(result, Ok('i')); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>with<P2>(<span class="self">self</span>, p: P2) -> With<<span class="self">Self</span>, P2> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| P2: Parser<Input>, |
| { |
| with(<span class="self">self</span>, p) |
| } |
| |
| <span class="doccomment">/// Discards the value of the `p` parser and returns the value of `self`. |
| /// Fails if any of the parsers fails. |
| /// |
| /// ``` |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::parser::char::digit; |
| /// # fn main() { |
| /// let result = digit() |
| /// .skip(token('i')) |
| /// .parse("9i") |
| /// .map(|x| x.0); |
| /// assert_eq!(result, Ok('9')); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>skip<P2>(<span class="self">self</span>, p: P2) -> Skip<<span class="self">Self</span>, P2> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| P2: Parser<Input>, |
| { |
| skip(<span class="self">self</span>, p) |
| } |
| |
| <span class="doccomment">/// Parses with `self` followed by `p`. |
| /// Succeeds if both parsers succeed, otherwise fails. |
| /// Returns a tuple with both values on success. |
| /// |
| /// ``` |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::parser::char::digit; |
| /// # fn main() { |
| /// let result = digit() |
| /// .and(token('i')) |
| /// .parse("9i") |
| /// .map(|x| x.0); |
| /// assert_eq!(result, Ok(('9', 'i'))); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>and<P2>(<span class="self">self</span>, p: P2) -> (<span class="self">Self</span>, P2) |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| P2: Parser<Input>, |
| { |
| (<span class="self">self</span>, p) |
| } |
| |
| <span class="doccomment">/// Returns a parser which attempts to parse using `self`. If `self` fails without committing |
| /// it tries to consume the same input using `p`. |
| /// |
| /// If you are looking to chain 3 or more parsers using `or` you may consider using the |
| /// [`choice!`] macro instead, which can be clearer and may result in a faster parser. |
| /// |
| /// ``` |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::parser::char::{digit, string}; |
| /// # fn main() { |
| /// let mut parser = string("let") |
| /// .or(digit().map(|_| "digit")) |
| /// .or(string("led")); |
| /// assert_eq!(parser.parse("let"), Ok(("let", ""))); |
| /// assert_eq!(parser.parse("1"), Ok(("digit", ""))); |
| /// assert!(parser.parse("led").is_err()); |
| /// |
| /// let mut parser2 = string("two").or(string("three")); |
| /// // Fails as the parser for "two" consumes the first 't' before failing |
| /// assert!(parser2.parse("three").is_err()); |
| /// |
| /// // Use 'attempt' to make failing parsers always act as if they have not committed any input |
| /// let mut parser3 = attempt(string("two")).or(attempt(string("three"))); |
| /// assert_eq!(parser3.parse("three"), Ok(("three", ""))); |
| /// # } |
| /// ``` |
| /// |
| /// [`choice!`]: super::choice! |
| </span><span class="kw">fn </span>or<P2>(<span class="self">self</span>, p: P2) -> Or<<span class="self">Self</span>, P2> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| P2: Parser<Input, Output = <span class="self">Self</span>::Output>, |
| { |
| or(<span class="self">self</span>, p) |
| } |
| |
| <span class="doccomment">/// Parses using `self` and then passes the value to `f` which returns a parser used to parse |
| /// the rest of the input. |
| /// |
| /// Since the parser returned from `f` must have a single type it can be useful to use the |
| /// [`left`](Parser::left) and [`right`](Parser::right) methods to merge parsers of differing types into one. |
| /// |
| /// If you are using partial parsing you may want to use [`then_partial`](Parser::then_partial) instead. |
| /// |
| /// ``` |
| /// # #![cfg(feature = "std")] |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::parser::char::digit; |
| /// # use combine::error::Commit; |
| /// # use combine::stream::easy; |
| /// # fn main() { |
| /// let result = digit() |
| /// .then(|d| { |
| /// if d == '9' { |
| /// value(9).left() |
| /// } |
| /// else { |
| /// unexpected_any(d).message("Not a nine").right() |
| /// } |
| /// }) |
| /// .easy_parse("9"); |
| /// assert_eq!(result, Ok((9, ""))); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>then<N, F>(<span class="self">self</span>, f: F) -> Then<<span class="self">Self</span>, F> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| F: FnMut(<span class="self">Self</span>::Output) -> N, |
| N: Parser<Input>, |
| { |
| then(<span class="self">self</span>, f) |
| } |
| |
| <span class="doccomment">/// Variant of [`then`](Parser::then) which parses using `self` and then passes the value to `f` as a `&mut` reference. |
| /// |
| /// Useful when doing partial parsing since it does not need to store the parser returned by |
| /// `f` in the partial state. Instead it will call `f` each to request a new parser each time |
| /// parsing resumes and that parser is needed. |
| /// |
| /// Since the parser returned from `f` must have a single type it can be useful to use the |
| /// [`left`](Parser::left) and [`right`](Parser::right) methods to merge parsers of differing types into one. |
| /// |
| /// ``` |
| /// # #![cfg(feature = "std")] |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::parser::char::digit; |
| /// # use combine::error::Commit; |
| /// # use combine::stream::easy; |
| /// # fn main() { |
| /// let result = digit() |
| /// .then_partial(|d| { |
| /// if *d == '9' { |
| /// value(9).left() |
| /// } |
| /// else { |
| /// unexpected_any(*d).message("Not a nine").right() |
| /// } |
| /// }) |
| /// .easy_parse("9"); |
| /// assert_eq!(result, Ok((9, ""))); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>then_partial<N, F>(<span class="self">self</span>, f: F) -> ThenPartial<<span class="self">Self</span>, F> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| F: FnMut(<span class="kw-2">&mut </span><span class="self">Self</span>::Output) -> N, |
| N: Parser<Input>, |
| { |
| then_partial(<span class="self">self</span>, f) |
| } |
| |
| <span class="doccomment">/// Parses using `self` and then passes a reference to the value to `f` which returns a parser |
| /// used to parse the rest of the input. The value is then combined with the output of `f`. |
| /// |
| /// Since the parser returned from `f` must have a single type it can be useful to use the |
| /// `left` and `right` methods to merge parsers of differing types into one. |
| /// |
| /// ``` |
| /// # #![cfg(feature = "std")] |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::parser::char::digit; |
| /// # use combine::error::Commit; |
| /// # use combine::stream::easy; |
| /// # fn main() { |
| /// let result = digit() |
| /// .then_ref(|d| { |
| /// if *d == '9' { |
| /// digit().left() |
| /// } |
| /// else { |
| /// unexpected_any(*d).message("Not a nine").right() |
| /// } |
| /// }) |
| /// .easy_parse("98"); |
| /// assert_eq!(result, Ok((('9', '8'), ""))); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>then_ref<N, F>(<span class="self">self</span>, f: F) -> ThenRef<<span class="self">Self</span>, F> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| F: FnMut(<span class="kw-2">&</span><span class="self">Self</span>::Output) -> N, |
| N: Parser<Input>, |
| { |
| then_ref(<span class="self">self</span>, f) |
| } |
| |
| <span class="doccomment">/// Uses `f` to map over the parsed value. |
| /// |
| /// ``` |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::parser::char::digit; |
| /// # fn main() { |
| /// let result = digit() |
| /// .map(|c| c == '9') |
| /// .parse("9") |
| /// .map(|x| x.0); |
| /// assert_eq!(result, Ok(true)); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>map<F, B>(<span class="self">self</span>, f: F) -> Map<<span class="self">Self</span>, F> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| F: FnMut(<span class="self">Self</span>::Output) -> B, |
| { |
| map(<span class="self">self</span>, f) |
| } |
| |
| <span class="kw">fn </span>map_input<F, B>(<span class="self">self</span>, f: F) -> MapInput<<span class="self">Self</span>, F> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| F: FnMut(<span class="self">Self</span>::Output, <span class="kw-2">&mut </span>Input) -> B, |
| { |
| map_input(<span class="self">self</span>, f) |
| } |
| |
| <span class="doccomment">/// Uses `f` to map over the output of `self`. If `f` returns an error the parser fails. |
| /// |
| /// ``` |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::parser::char::digit; |
| /// # use combine::parser::range::take; |
| /// # fn main() { |
| /// let result = take(4) |
| /// .flat_map(|bs| many(digit()).parse(bs).map(|t| t.0)) |
| /// .parse("12abcd"); |
| /// assert_eq!(result, Ok((String::from("12"), "cd"))); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>flat_map<F, B>(<span class="self">self</span>, f: F) -> FlatMap<<span class="self">Self</span>, F> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| F: FnMut(<span class="self">Self</span>::Output) -> <span class="prelude-ty">Result</span><B, <Input <span class="kw">as </span>StreamOnce>::Error>, |
| { |
| flat_map(<span class="self">self</span>, f) |
| } |
| |
| <span class="doccomment">/// Parses with `self` and if it fails, adds the message `msg` to the error. |
| /// |
| /// ``` |
| /// # #![cfg(feature = "std")] |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::stream::easy; |
| /// # use combine::stream::position::{self, SourcePosition}; |
| /// # fn main() { |
| /// let result = token('9') |
| /// .message("Not a nine") |
| /// .easy_parse(position::Stream::new("8")); |
| /// assert_eq!(result, Err(easy::Errors { |
| /// position: SourcePosition::default(), |
| /// errors: vec![ |
| /// easy::Error::Unexpected('8'.into()), |
| /// easy::Error::Expected('9'.into()), |
| /// easy::Error::Message("Not a nine".into()) |
| /// ] |
| /// })); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>message<S>(<span class="self">self</span>, msg: S) -> Message<<span class="self">Self</span>, S> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| S: <span class="kw">for</span><<span class="lifetime">'s</span>> ErrorInfo<<span class="lifetime">'s</span>, Input::Token, Input::Range>, |
| { |
| message(<span class="self">self</span>, msg) |
| } |
| |
| <span class="doccomment">/// Parses with `self` and if it fails without consuming any input any expected errors are |
| /// replaced by `msg`. `msg` is then used in error messages as "Expected `msg`". |
| /// |
| /// ``` |
| /// # #![cfg(feature = "std")] |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::error; |
| /// # use combine::stream::easy; |
| /// # use combine::stream::position::{self, SourcePosition}; |
| /// # fn main() { |
| /// let result = token('9') |
| /// .expected("nine") |
| /// .easy_parse(position::Stream::new("8")); |
| /// assert_eq!(result, Err(easy::Errors { |
| /// position: SourcePosition::default(), |
| /// errors: vec![ |
| /// easy::Error::Unexpected('8'.into()), |
| /// easy::Error::Expected("nine".into()) |
| /// ] |
| /// })); |
| /// |
| /// let result = token('9') |
| /// .expected(error::Format(format_args!("That is not a nine!"))) |
| /// .easy_parse(position::Stream::new("8")); |
| /// assert_eq!(result, Err(easy::Errors { |
| /// position: SourcePosition::default(), |
| /// errors: vec![ |
| /// easy::Error::Unexpected('8'.into()), |
| /// easy::Error::Expected("That is not a nine!".to_string().into()) |
| /// ] |
| /// })); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>expected<S>(<span class="self">self</span>, msg: S) -> Expected<<span class="self">Self</span>, S> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| S: <span class="kw">for</span><<span class="lifetime">'s</span>> ErrorInfo<<span class="lifetime">'s</span>, Input::Token, Input::Range>, |
| { |
| expected(<span class="self">self</span>, msg) |
| } |
| |
| <span class="doccomment">/// Parses with `self`, if it fails without consuming any input any expected errors that would |
| /// otherwise be emitted by `self` are suppressed. |
| /// |
| /// ``` |
| /// # #![cfg(feature = "std")] |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::stream::easy; |
| /// # use combine::stream::position::{self, SourcePosition}; |
| /// # fn main() { |
| /// let result = token('9') |
| /// .expected("nine") |
| /// .silent() |
| /// .easy_parse(position::Stream::new("8")); |
| /// assert_eq!(result, Err(easy::Errors { |
| /// position: SourcePosition::default(), |
| /// errors: vec![ |
| /// easy::Error::Unexpected('8'.into()), |
| /// ] |
| /// })); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>silent(<span class="self">self</span>) -> Silent<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| { |
| silent(<span class="self">self</span>) |
| } |
| |
| <span class="doccomment">/// Parses with `self` and applies `f` on the result if `self` parses successfully. |
| /// `f` may optionally fail with an error which is automatically converted to a `ParseError`. |
| /// |
| /// ``` |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::stream::position::{self, SourcePosition}; |
| /// # use combine::parser::char::digit; |
| /// # fn main() { |
| /// let mut parser = many1(digit()) |
| /// .and_then(|s: String| s.parse::<i32>()); |
| /// let result = parser.easy_parse(position::Stream::new("1234")).map(|(x, state)| (x, state.input)); |
| /// assert_eq!(result, Ok((1234, ""))); |
| /// let result = parser.easy_parse(position::Stream::new("999999999999999999999999")); |
| /// assert!(result.is_err()); |
| /// // Errors are report as if they occurred at the start of the parse |
| /// assert_eq!(result.unwrap_err().position, SourcePosition { line: 1, column: 1 }); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>and_then<F, O, E>(<span class="self">self</span>, f: F) -> AndThen<<span class="self">Self</span>, F> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Parser<Input> + Sized, |
| F: FnMut(<span class="self">Self</span>::Output) -> <span class="prelude-ty">Result</span><O, E>, |
| E: Into< |
| <Input::Error <span class="kw">as </span>ParseError<Input::Token, Input::Range, Input::Position>>::StreamError, |
| >, |
| { |
| and_then(<span class="self">self</span>, f) |
| } |
| |
| <span class="doccomment">/// Creates an iterator from a parser and a state. Can be used as an alternative to [`many`] |
| /// when collecting directly into a `Extend` type is not desirable. |
| /// |
| /// ``` |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::parser::char::{char, digit}; |
| /// # fn main() { |
| /// let mut buffer = String::new(); |
| /// let number = parser(|input| { |
| /// buffer.clear(); |
| /// let mut iter = digit().iter(input); |
| /// buffer.extend(&mut iter); |
| /// let i = buffer.parse::<i32>().unwrap(); |
| /// iter.into_result(i) |
| /// }); |
| /// let result = sep_by(number, char(',')) |
| /// .parse("123,45,6"); |
| /// assert_eq!(result, Ok((vec![123, 45, 6], ""))); |
| /// # } |
| /// ``` |
| /// |
| /// [`many`]: repeat::many |
| </span><span class="kw">fn </span>iter(<span class="self">self</span>, input: <span class="kw-2">&mut </span>Input) -> Iter<<span class="lifetime">'_</span>, Input, <span class="self">Self</span>, <span class="self">Self</span>::PartialState, FirstMode> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Parser<Input> + Sized, |
| { |
| Iter::new(<span class="self">self</span>, FirstMode, input, Default::default()) |
| } |
| |
| <span class="doccomment">/// Creates an iterator from a parser and a state. Can be used as an alternative to [`many`] |
| /// when collecting directly into a `Extend` type is not desirable. |
| /// |
| /// ``` |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::parser::char::{char, digit}; |
| /// # fn main() { |
| /// let mut buffer = String::new(); |
| /// let number = parser(|input| { |
| /// buffer.clear(); |
| /// let mut iter = digit().iter(input); |
| /// buffer.extend(&mut iter); |
| /// let i = buffer.parse::<i32>().unwrap(); |
| /// iter.into_result(i) |
| /// }); |
| /// let result = sep_by(number, char(',')) |
| /// .parse("123,45,6"); |
| /// assert_eq!(result, Ok((vec![123, 45, 6], ""))); |
| /// # } |
| /// ``` |
| /// |
| /// [`many`]: repeat::many |
| </span><span class="kw">fn </span>partial_iter<<span class="lifetime">'a</span>, <span class="lifetime">'s</span>, M>( |
| <span class="self">self</span>, |
| mode: M, |
| input: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Input, |
| partial_state: <span class="kw-2">&</span><span class="lifetime">'s </span><span class="kw-2">mut </span><span class="self">Self</span>::PartialState, |
| ) -> Iter<<span class="lifetime">'a</span>, Input, <span class="self">Self</span>, <span class="kw-2">&</span><span class="lifetime">'s </span><span class="kw-2">mut </span><span class="self">Self</span>::PartialState, M> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Parser<Input> + Sized, |
| M: ParseMode, |
| { |
| Iter::new(<span class="self">self</span>, mode, input, partial_state) |
| } |
| |
| <span class="doccomment">/// Turns the parser into a trait object by putting it in a `Box`. Can be used to easily |
| /// return parsers from functions without naming the type. |
| /// |
| /// ``` |
| /// # use combine::*; |
| /// # fn main() { |
| /// fn test<'input, F>( |
| /// c: char, |
| /// f: F) |
| /// -> Box<dyn Parser<&'input str, Output = (char, char), PartialState = ()> + 'input> |
| /// where F: FnMut(char) -> bool + 'static |
| /// { |
| /// combine::parser::combinator::no_partial((token(c), satisfy(f))).boxed() |
| /// } |
| /// let result = test('a', |c| c >= 'a' && c <= 'f') |
| /// .parse("ac"); |
| /// assert_eq!(result, Ok((('a', 'c'), ""))); |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| </span><span class="kw">fn </span>boxed<<span class="lifetime">'a</span>>( |
| <span class="self">self</span>, |
| ) -> Box<<span class="kw">dyn </span>Parser<Input, Output = <span class="self">Self</span>::Output, PartialState = <span class="self">Self</span>::PartialState> + <span class="lifetime">'a</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized + <span class="lifetime">'a</span>, |
| { |
| Box::new(<span class="self">self</span>) |
| } |
| |
| <span class="doccomment">/// Wraps the parser into the [`Either`](combinator::Either) enum which allows combinators such as [`then`](Parser::then) to return |
| /// multiple different parser types (merging them to one) |
| /// |
| /// ``` |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::parser::char::{digit, letter}; |
| /// # fn main() { |
| /// let mut parser = any().then(|c| |
| /// if c == '#' { |
| /// skip_many(satisfy(|c| c != '\n')) |
| /// .with(value("".to_string())) |
| /// .left() |
| /// } else { |
| /// many1(letter()) |
| /// .map(move |mut s: String| { s.insert(0, c); s }) |
| /// .right() |
| /// }); |
| /// |
| /// let result = parser.parse("ac2"); |
| /// assert_eq!(result, Ok(("ac".to_string(), "2"))); |
| /// |
| /// let result = parser.parse("# ac2"); |
| /// assert_eq!(result, Ok(("".to_string(), ""))); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>left<R>(<span class="self">self</span>) -> Either<<span class="self">Self</span>, R> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| R: Parser<Input, Output = <span class="self">Self</span>::Output>, |
| { |
| Either::Left(<span class="self">self</span>) |
| } |
| |
| <span class="doccomment">/// Wraps the parser into the [`Either`](combinator::Either) enum which allows combinators such as [`then`](Parser::then) to return |
| /// multiple different parser types (merging them to one) |
| /// |
| /// ``` |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # use combine::parser::char::{digit, letter}; |
| /// # fn main() { |
| /// let mut parser = any().then(|c| |
| /// if c == '#' { |
| /// skip_many(satisfy(|c| c != '\n')) |
| /// .with(value("".to_string())) |
| /// .left() |
| /// } else { |
| /// many1(letter()) |
| /// .map(move |mut s: String| { s.insert(0, c); s }) |
| /// .right() |
| /// }); |
| /// |
| /// let result = parser.parse("ac2"); |
| /// assert_eq!(result, Ok(("ac".to_string(), "2"))); |
| /// |
| /// let result = parser.parse("# ac2"); |
| /// assert_eq!(result, Ok(("".to_string(), ""))); |
| /// # } |
| /// ``` |
| </span><span class="kw">fn </span>right<L>(<span class="self">self</span>) -> Either<L, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| L: Parser<Input, Output = <span class="self">Self</span>::Output>, |
| { |
| Either::Right(<span class="self">self</span>) |
| } |
| |
| <span class="doccomment">/// Marks errors produced inside the `self` parser with the span from the start of the parse to |
| /// the end of it. |
| /// |
| /// [`p.spanned()`]: ../trait.Parser.html#method.spanned |
| /// |
| /// ``` |
| /// use combine::{*, parser::{char::string, combinator::spanned}}; |
| /// use combine::stream::{easy, span}; |
| /// |
| /// let input = "hel"; |
| /// let result = spanned(string("hello")).parse( |
| /// span::Stream::<_, easy::Errors<_, _, span::Span<_>>>::from(easy::Stream::from(input)), |
| /// ); |
| /// assert!(result.is_err()); |
| /// assert_eq!( |
| /// result.unwrap_err().position.map(|p| p.translate_position(input)), |
| /// span::Span { start: 0, end: 3 }, |
| /// ); |
| /// ``` |
| </span><span class="kw">fn </span>spanned(<span class="self">self</span>) -> Spanned<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| { |
| spanned(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="doccomment">/// Provides the `easy_parse` method which provides good error messages by default |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| </span><span class="kw">pub trait </span>EasyParser<Input: Stream>: Parser<<span class="kw">crate</span>::easy::Stream<Input>> |
| <span class="kw">where |
| </span>Input::Token: PartialEq, |
| Input::Range: PartialEq, |
| { |
| <span class="doccomment">/// Entry point of the parser. Takes some input and tries to parse it, returning an easy to use |
| /// and format error if parsing did not succeed. |
| /// |
| /// Returns the parsed result and the remaining input if the parser succeeds, or a |
| /// This function wraps requires `Input == easy::Stream<Input>` which makes it return |
| /// return `easy::Errors` if an error occurs. Due to this wrapping it is recommended that the |
| /// parser `Self` is written with a generic input type. |
| /// |
| /// ``` |
| /// # #[macro_use] |
| /// # extern crate combine; |
| /// |
| /// use combine::*; |
| /// use combine::parser::repeat::many1; |
| /// use combine::parser::char::letter; |
| /// |
| /// // Good! |
| /// parser!{ |
| /// fn my_parser[Input]()(Input) -> String |
| /// where [Input: Stream<Token = char>] |
| /// { |
| /// many1::<String, _, _>(letter()) |
| /// } |
| /// } |
| /// |
| /// // Won't compile with `easy_parse` since it is specialized on `&str` |
| /// parser!{ |
| /// fn my_parser2['a]()(&'a str) -> String |
| /// where [&'a str: Stream<Token = char, Range = &'a str>] |
| /// { |
| /// many1(letter()) |
| /// } |
| /// } |
| /// |
| /// fn main() { |
| /// assert_eq!(my_parser().parse("abc"), Ok(("abc".to_string(), ""))); |
| /// // Would fail to compile if uncommented |
| /// // my_parser2().parse("abc") |
| /// } |
| /// ``` |
| /// |
| /// [`ParseError`]: struct.ParseError.html |
| </span><span class="kw">fn </span>easy_parse( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: Input, |
| ) -> <span class="prelude-ty">Result</span>< |
| (<<span class="self">Self </span><span class="kw">as </span>Parser<<span class="kw">crate</span>::easy::Stream<Input>>>::Output, Input), |
| <span class="kw">crate</span>::easy::ParseError<Input>, |
| > |
| <span class="kw">where |
| </span>Input: Stream, |
| <span class="kw">crate</span>::easy::Stream<Input>: StreamOnce< |
| Token = Input::Token, |
| Range = Input::Range, |
| Error = <span class="kw">crate</span>::easy::ParseError<<span class="kw">crate</span>::easy::Stream<Input>>, |
| Position = Input::Position, |
| >, |
| Input::Position: Default, |
| <span class="self">Self</span>: Sized + Parser<<span class="kw">crate</span>::easy::Stream<Input>>, |
| { |
| <span class="kw">let </span>input = <span class="kw">crate</span>::easy::Stream(input); |
| <span class="self">self</span>.parse(input).map(|(v, input)| (v, input.<span class="number">0</span>)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">impl</span><Input, P> EasyParser<Input> <span class="kw">for </span>P |
| <span class="kw">where |
| </span>P: <span class="question-mark">?</span>Sized + Parser<<span class="kw">crate</span>::easy::Stream<Input>>, |
| Input: Stream, |
| Input::Token: PartialEq, |
| Input::Range: PartialEq, |
| { |
| } |
| |
| <span class="macro">macro_rules! </span>forward_deref { |
| (Input) => { |
| <span class="kw">type </span>Output = P::Output; |
| <span class="kw">type </span>PartialState = P::PartialState; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>parse_first( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&mut </span>Input, |
| state: <span class="kw-2">&mut </span><span class="self">Self</span>::PartialState, |
| ) -> ParseResult<<span class="self">Self</span>::Output, <Input <span class="kw">as </span>StreamOnce>::Error> { |
| (<span class="kw-2">**</span><span class="self">self</span>).parse_first(input, state) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>parse_partial( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&mut </span>Input, |
| state: <span class="kw-2">&mut </span><span class="self">Self</span>::PartialState, |
| ) -> ParseResult<<span class="self">Self</span>::Output, <Input <span class="kw">as </span>StreamOnce>::Error> { |
| (<span class="kw-2">**</span><span class="self">self</span>).parse_partial(input, state) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>add_error(<span class="kw-2">&mut </span><span class="self">self</span>, error: <span class="kw-2">&mut </span>Tracked<<Input <span class="kw">as </span>StreamOnce>::Error>) { |
| (<span class="kw-2">**</span><span class="self">self</span>).add_error(error) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>add_committed_expected_error( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| error: <span class="kw-2">&mut </span>Tracked<<Input <span class="kw">as </span>StreamOnce>::Error>, |
| ) { |
| (<span class="kw-2">**</span><span class="self">self</span>).add_committed_expected_error(error) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>parser_count(<span class="kw-2">&</span><span class="self">self</span>) -> ErrorOffset { |
| (<span class="kw-2">**</span><span class="self">self</span>).parser_count() |
| } |
| }; |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, P, Input> Parser<Input> <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>P |
| <span class="kw">where |
| </span>P: <span class="question-mark">?</span>Sized + Parser<Input>, |
| Input: Stream, |
| { |
| <span class="macro">forward_deref!</span>(Input); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">impl</span><P, Input> Parser<Input> <span class="kw">for </span>Box<P> |
| <span class="kw">where |
| </span>P: <span class="question-mark">?</span>Sized + Parser<Input>, |
| Input: Stream, |
| { |
| <span class="macro">forward_deref!</span>(Input); |
| } |
| |
| <span class="doccomment">/// Internal API. May break without a semver bump |
| </span><span class="attribute">#[doc(hidden)] |
| </span><span class="doccomment">/// Specifies whether the parser must check for partial state that must be resumed |
| </span><span class="kw">pub trait </span>ParseMode: Copy { |
| <span class="doccomment">/// If `true` then the parser has no previous state to resume otherwise the parser *might* have |
| /// state to resume which it must check. |
| </span><span class="kw">fn </span>is_first(<span class="self">self</span>) -> bool; |
| <span class="doccomment">/// Puts the mode into `first` parsing. |
| </span><span class="kw">fn </span>set_first(<span class="kw-2">&mut </span><span class="self">self</span>); |
| |
| <span class="kw">fn </span>parse<P, Input>( |
| <span class="self">self</span>, |
| parser: <span class="kw-2">&mut </span>P, |
| input: <span class="kw-2">&mut </span>Input, |
| state: <span class="kw-2">&mut </span>P::PartialState, |
| ) -> ParseResult<P::Output, Input::Error> |
| <span class="kw">where |
| </span>P: Parser<Input>, |
| Input: Stream; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>parse_committed<P, Input>( |
| <span class="self">self</span>, |
| parser: <span class="kw-2">&mut </span>P, |
| input: <span class="kw-2">&mut </span>Input, |
| state: <span class="kw-2">&mut </span>P::PartialState, |
| ) -> ParseResult<P::Output, <Input <span class="kw">as </span>StreamOnce>::Error> |
| <span class="kw">where |
| </span>P: Parser<Input>, |
| Input: Stream, |
| { |
| <span class="kw">let </span>before = input.checkpoint(); |
| <span class="kw">let </span><span class="kw-2">mut </span>result = parser.parse_mode_impl(<span class="self">self</span>, input, state); |
| <span class="kw">if let </span>ParseResult::PeekErr(<span class="kw-2">ref mut </span>error) = result { |
| <span class="macro">ctry!</span>(input.reset(before.clone()).committed()); |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(t) = input.uncons() { |
| <span class="macro">ctry!</span>(input.reset(before).committed()); |
| error.error.add_unexpected(Token(t)); |
| } <span class="kw">else </span>{ |
| error.error.add(StreamErrorFor::<Input>::end_of_input()); |
| } |
| parser.add_error(error); |
| } |
| result |
| } |
| } |
| |
| <span class="doccomment">/// Internal API. May break without a semver bump |
| </span><span class="attribute">#[doc(hidden)] |
| #[derive(Copy, Clone)] |
| </span><span class="kw">pub struct </span>FirstMode; |
| <span class="kw">impl </span>ParseMode <span class="kw">for </span>FirstMode { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>is_first(<span class="self">self</span>) -> bool { |
| <span class="bool-val">true |
| </span>} |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>set_first(<span class="kw-2">&mut </span><span class="self">self</span>) {} |
| |
| <span class="kw">fn </span>parse<P, Input>( |
| <span class="self">self</span>, |
| parser: <span class="kw-2">&mut </span>P, |
| input: <span class="kw-2">&mut </span>Input, |
| state: <span class="kw-2">&mut </span>P::PartialState, |
| ) -> ParseResult<P::Output, Input::Error> |
| <span class="kw">where |
| </span>P: Parser<Input>, |
| Input: Stream, |
| { |
| parser.parse_mode_impl(FirstMode, input, state) |
| } |
| } |
| |
| <span class="doccomment">/// Internal API. May break without a semver bump |
| </span><span class="attribute">#[doc(hidden)] |
| #[derive(Copy, Clone, Default)] |
| </span><span class="kw">pub struct </span>PartialMode { |
| <span class="kw">pub </span>first: bool, |
| } |
| <span class="kw">impl </span>ParseMode <span class="kw">for </span>PartialMode { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>is_first(<span class="self">self</span>) -> bool { |
| <span class="self">self</span>.first |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>set_first(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.first = <span class="bool-val">true</span>; |
| } |
| |
| <span class="kw">fn </span>parse<P, Input>( |
| <span class="self">self</span>, |
| parser: <span class="kw-2">&mut </span>P, |
| input: <span class="kw-2">&mut </span>Input, |
| state: <span class="kw-2">&mut </span>P::PartialState, |
| ) -> ParseResult<P::Output, Input::Error> |
| <span class="kw">where |
| </span>P: Parser<Input>, |
| Input: Stream, |
| { |
| <span class="kw">if </span><span class="self">self</span>.is_first() { |
| parser.parse_mode_impl(FirstMode, input, state) |
| } <span class="kw">else </span>{ |
| parser.parse_mode_impl(<span class="self">self</span>, input, state) |
| } |
| } |
| } |
| </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> |
