| <!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/stream/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="comment">// |
| //Traits and implementations of arbitrary data streams. |
| </span><span class="doccomment">//! |
| //! Streams are similar to the `Iterator` trait in that they represent some sequential set of items |
| //! which can be retrieved one by one. Where `Stream`s differ is that they are allowed to return |
| //! errors instead of just `None` and if they implement the `RangeStreamOnce` trait they are also |
| //! capable of returning multiple items at the same time, usually in the form of a slice. |
| //! |
| //! In addition to he functionality above, a proper `Stream` usable by a `Parser` must also have a |
| //! position (marked by the `Positioned` trait) and must also be resetable (marked by the |
| //! `ResetStream` trait). The former is used to ensure that errors at different points in the stream |
| //! aren't combined and the latter is used in parsers such as `or` to try multiple alternative |
| //! parses. |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::lib::{cmp::Ordering, fmt, marker::PhantomData, str::Chars}; |
| |
| <span class="kw">use crate</span>::{ |
| error::{ |
| ParseError, |
| ParseResult::{<span class="self">self</span>, <span class="kw-2">*</span>}, |
| StreamError, StringStreamError, Tracked, UnexpectedParse, |
| }, |
| Parser, |
| }; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">pub use </span><span class="self">self</span>::decoder::Decoder; |
| |
| <span class="attribute">#[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>clone_resetable { |
| (( $(<span class="macro-nonterminal">$params</span>: tt)* ) <span class="macro-nonterminal">$ty</span>: ty) => { |
| <span class="kw">impl</span><$(<span class="macro-nonterminal">$params</span>)<span class="kw-2">*</span>> ResetStream <span class="kw">for </span><span class="macro-nonterminal">$ty |
| </span><span class="kw">where </span><span class="self">Self</span>: StreamOnce |
| { |
| <span class="kw">type </span>Checkpoint = <span class="self">Self</span>; |
| |
| <span class="kw">fn </span>checkpoint(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="self">self</span>.clone() |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>reset(<span class="kw-2">&mut </span><span class="self">self</span>, checkpoint: <span class="self">Self</span>) -> <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error> { |
| <span class="kw-2">*</span><span class="self">self </span>= checkpoint; |
| <span class="prelude-val">Ok</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 mod </span>buf_reader; |
| <span class="doccomment">/// Stream wrapper which provides a `ResetStream` impl for `StreamOnce` impls which do not have |
| /// one. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"alloc"</span>)))] |
| </span><span class="kw">pub mod </span>buffered; |
| <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 mod </span>easy; |
| <span class="doccomment">/// Stream wrapper which provides more detailed position information. |
| </span><span class="kw">pub mod </span>position; |
| <span class="doccomment">/// Stream wrapper allowing `std::io::Read` to be used |
| </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 mod </span>read; |
| <span class="kw">pub mod </span>span; |
| <span class="doccomment">/// Stream wrapper allowing custom state to be used. |
| </span><span class="kw">pub mod </span>state; |
| |
| <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 mod </span>decoder; |
| |
| <span class="doccomment">/// A type which has a position. |
| </span><span class="kw">pub trait </span>Positioned: StreamOnce { |
| <span class="doccomment">/// Returns the current position of the stream. |
| </span><span class="kw">fn </span>position(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Position; |
| } |
| |
| <span class="doccomment">/// Convenience alias over the `StreamError` for the input stream `Input` |
| /// |
| /// ``` |
| /// #[macro_use] |
| /// extern crate combine; |
| /// use combine::{easy, Parser, Stream, many1}; |
| /// use combine::parser::char::letter; |
| /// use combine::stream::StreamErrorFor; |
| /// use combine::error::{ParseError, StreamError}; |
| /// |
| /// parser!{ |
| /// fn parser[Input]()(Input) -> String |
| /// where [ Input: Stream<Token = char>, ] |
| /// { |
| /// many1(letter()).and_then(|word: String| { |
| /// if word == "combine" { |
| /// Ok(word) |
| /// } else { |
| /// // The alias makes it easy to refer to the `StreamError` type of `Input` |
| /// Err(StreamErrorFor::<Input>::expected_static_message("combine")) |
| /// } |
| /// }) |
| /// } |
| /// } |
| /// |
| /// fn main() { |
| /// } |
| /// ``` |
| </span><span class="kw">pub type </span>StreamErrorFor<Input> = <<Input <span class="kw">as </span>StreamOnce>::Error <span class="kw">as </span>ParseError< |
| <Input <span class="kw">as </span>StreamOnce>::Token, |
| <Input <span class="kw">as </span>StreamOnce>::Range, |
| <Input <span class="kw">as </span>StreamOnce>::Position, |
| >>::StreamError; |
| |
| <span class="doccomment">/// `StreamOnce` represents a sequence of items that can be extracted one by one. |
| </span><span class="kw">pub trait </span>StreamOnce { |
| <span class="doccomment">/// The type of items which is yielded from this stream. |
| </span><span class="kw">type </span>Token: Clone; |
| |
| <span class="doccomment">/// The type of a range of items yielded from this stream. |
| /// Types which do not a have a way of yielding ranges of items should just use the |
| /// `Self::Token` for this type. |
| </span><span class="kw">type </span>Range: Clone; |
| |
| <span class="doccomment">/// Type which represents the position in a stream. |
| /// `Ord` is required to allow parsers to determine which of two positions are further ahead. |
| </span><span class="kw">type </span>Position: Clone + Ord; |
| |
| <span class="kw">type </span>Error: ParseError<<span class="self">Self</span>::Token, <span class="self">Self</span>::Range, <span class="self">Self</span>::Position>; |
| <span class="doccomment">/// Takes a stream and removes its first token, yielding the token and the rest of the elements. |
| /// Returns `Err` if no element could be retrieved. |
| </span><span class="kw">fn </span>uncons(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Token, StreamErrorFor<<span class="self">Self</span>>>; |
| |
| <span class="doccomment">/// Returns `true` if this stream only contains partial input. |
| /// |
| /// See `PartialStream`. |
| </span><span class="kw">fn </span>is_partial(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="bool-val">false |
| </span>} |
| } |
| |
| <span class="doccomment">/// A `StreamOnce` which can create checkpoints which the stream can be reset to |
| </span><span class="kw">pub trait </span>ResetStream: StreamOnce { |
| <span class="kw">type </span>Checkpoint: Clone; |
| |
| <span class="doccomment">/// Creates a `Checkpoint` at the current position which can be used to reset the stream |
| /// later to the current position |
| </span><span class="kw">fn </span>checkpoint(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Checkpoint; |
| <span class="doccomment">/// Attempts to reset the stream to an earlier position. |
| </span><span class="kw">fn </span>reset(<span class="kw-2">&mut </span><span class="self">self</span>, checkpoint: <span class="self">Self</span>::Checkpoint) -> <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>; |
| } |
| |
| <span class="macro">clone_resetable! </span>{(<span class="lifetime">'a</span>) <span class="kw-2">&</span><span class="lifetime">'a </span>str} |
| <span class="macro">clone_resetable! </span>{(<span class="lifetime">'a</span>, T) <span class="kw-2">&</span><span class="lifetime">'a </span>[T]} |
| <span class="macro">clone_resetable! </span>{(<span class="lifetime">'a</span>, T) SliceStream<<span class="lifetime">'a</span>, T> } |
| <span class="macro">clone_resetable! </span>{(T: Clone) IteratorStream<T>} |
| |
| <span class="doccomment">/// A stream of tokens which can be duplicated |
| /// |
| /// This is a trait over types which implement the `StreamOnce`, `ResetStream` and `Positioned` |
| /// traits. If you need a custom `Stream` object then implement those traits and `Stream` is |
| /// implemented automatically. |
| </span><span class="kw">pub trait </span>Stream: StreamOnce + ResetStream + Positioned {} |
| |
| <span class="kw">impl</span><Input> Stream <span class="kw">for </span>Input |
| <span class="kw">where |
| </span>Input: StreamOnce + Positioned + ResetStream, |
| Input::Error: ParseError<Input::Token, Input::Range, Input::Position>, |
| { |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>uncons<Input>(input: <span class="kw-2">&mut </span>Input) -> ParseResult<Input::Token, Input::Error> |
| <span class="kw">where |
| </span>Input: <span class="question-mark">?</span>Sized + Stream, |
| { |
| <span class="kw">match </span>input.uncons() { |
| <span class="prelude-val">Ok</span>(x) => CommitOk(x), |
| <span class="prelude-val">Err</span>(err) => wrap_stream_error(input, err), |
| } |
| } |
| |
| <span class="doccomment">/// A `RangeStream` is an extension of `StreamOnce` which allows for zero copy parsing. |
| </span><span class="kw">pub trait </span>RangeStreamOnce: StreamOnce + ResetStream { |
| <span class="doccomment">/// Takes `size` elements from the stream. |
| /// Fails if the length of the stream is less than `size`. |
| </span><span class="kw">fn </span>uncons_range(<span class="kw-2">&mut </span><span class="self">self</span>, size: usize) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>>; |
| |
| <span class="doccomment">/// Takes items from stream, testing each one with `predicate`. |
| /// returns the range of items which passed `predicate`. |
| </span><span class="kw">fn </span>uncons_while<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool; |
| |
| <span class="attribute">#[inline] |
| </span><span class="doccomment">/// Takes items from stream, testing each one with `predicate` |
| /// returns a range of at least one items which passed `predicate`. |
| /// |
| /// # Note |
| /// |
| /// This may not return `PeekOk` as it should uncons at least one token. |
| </span><span class="kw">fn </span>uncons_while1<F>(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>f: F) -> ParseResult<<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>committed = <span class="bool-val">false</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>started_at_eoi = <span class="bool-val">true</span>; |
| <span class="kw">let </span>result = <span class="self">self</span>.uncons_while(|c| { |
| <span class="kw">let </span>ok = f(c); |
| committed |= ok; |
| started_at_eoi = <span class="bool-val">false</span>; |
| ok |
| }); |
| <span class="kw">if </span>committed { |
| <span class="kw">match </span>result { |
| <span class="prelude-val">Ok</span>(x) => CommitOk(x), |
| <span class="prelude-val">Err</span>(x) => CommitErr(x), |
| } |
| } <span class="kw">else if </span>started_at_eoi { |
| PeekErr(Tracked::from(StreamErrorFor::<<span class="self">Self</span>>::end_of_input())) |
| } <span class="kw">else </span>{ |
| PeekErr(Tracked::from( |
| StreamErrorFor::<<span class="self">Self</span>>::unexpected_static_message(<span class="string">""</span>), |
| )) |
| } |
| } |
| |
| <span class="doccomment">/// Returns the distance between `self` and `end`. The returned `usize` must be so that |
| /// |
| /// ```ignore |
| /// let start = stream.checkpoint(); |
| /// stream.uncons_range(distance); |
| /// stream.distance(&start) == distance |
| /// ``` |
| </span><span class="kw">fn </span>distance(<span class="kw-2">&</span><span class="self">self</span>, end: <span class="kw-2">&</span><span class="self">Self</span>::Checkpoint) -> usize; |
| |
| <span class="doccomment">/// Returns the entire range of `self` |
| </span><span class="kw">fn </span>range(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Range; |
| } |
| |
| <span class="doccomment">/// A `RangeStream` is an extension of `Stream` which allows for zero copy parsing. |
| </span><span class="kw">pub trait </span>RangeStream: Stream + RangeStreamOnce {} |
| |
| <span class="kw">impl</span><Input> RangeStream <span class="kw">for </span>Input <span class="kw">where </span>Input: RangeStreamOnce + Stream {} |
| |
| <span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub fn </span>wrap_stream_error<T, Input>( |
| input: <span class="kw-2">&</span>Input, |
| err: <Input::Error <span class="kw">as </span>ParseError<Input::Token, Input::Range, Input::Position>>::StreamError, |
| ) -> ParseResult<T, <Input <span class="kw">as </span>StreamOnce>::Error> |
| <span class="kw">where |
| </span>Input: <span class="question-mark">?</span>Sized + StreamOnce + Positioned, |
| { |
| <span class="kw">let </span>err = Input::Error::from_error(input.position(), err); |
| <span class="kw">if </span>input.is_partial() { |
| CommitErr(err) |
| } <span class="kw">else </span>{ |
| PeekErr(err.into()) |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>uncons_range<Input>( |
| input: <span class="kw-2">&mut </span>Input, |
| size: usize, |
| ) -> ParseResult<Input::Range, <Input <span class="kw">as </span>StreamOnce>::Error> |
| <span class="kw">where |
| </span>Input: <span class="question-mark">?</span>Sized + RangeStream, |
| { |
| <span class="kw">match </span>input.uncons_range(size) { |
| <span class="prelude-val">Err</span>(err) => wrap_stream_error(input, err), |
| <span class="prelude-val">Ok</span>(x) => { |
| <span class="kw">if </span>size == <span class="number">0 </span>{ |
| PeekOk(x) |
| } <span class="kw">else </span>{ |
| CommitOk(x) |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub fn </span>input_at_eof<Input>(input: <span class="kw-2">&mut </span>Input) -> bool |
| <span class="kw">where |
| </span>Input: <span class="question-mark">?</span>Sized + Stream, |
| { |
| <span class="kw">let </span>before = input.checkpoint(); |
| <span class="kw">let </span>x = input |
| .uncons() |
| .err() |
| .map_or(<span class="bool-val">false</span>, |err| err.is_unexpected_end_of_input()); |
| input.reset(before).is_ok() && x |
| } |
| |
| <span class="doccomment">/// Removes items from the input while `predicate` returns `true`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>uncons_while<Input, F>( |
| input: <span class="kw-2">&mut </span>Input, |
| predicate: F, |
| ) -> ParseResult<Input::Range, Input::Error> |
| <span class="kw">where |
| </span>F: FnMut(Input::Token) -> bool, |
| Input: <span class="question-mark">?</span>Sized + RangeStream, |
| Input::Range: Range, |
| { |
| <span class="kw">match </span>input.uncons_while(predicate) { |
| <span class="prelude-val">Err</span>(err) => wrap_stream_error(input, err), |
| <span class="prelude-val">Ok</span>(x) => { |
| <span class="kw">if </span>input.is_partial() && input_at_eof(input) { |
| <span class="comment">// Partial inputs which encounter end of file must fail to let more input be |
| // retrieved |
| </span>CommitErr(Input::Error::from_error( |
| input.position(), |
| StreamError::end_of_input(), |
| )) |
| } <span class="kw">else if </span>x.len() == <span class="number">0 </span>{ |
| PeekOk(x) |
| } <span class="kw">else </span>{ |
| CommitOk(x) |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="doccomment">/// Takes items from stream, testing each one with `predicate` |
| /// returns a range of at least one items which passed `predicate`. |
| /// |
| /// # Note |
| /// |
| /// This may not return `PeekOk` as it should uncons at least one token. |
| </span><span class="kw">pub fn </span>uncons_while1<Input, F>( |
| input: <span class="kw-2">&mut </span>Input, |
| predicate: F, |
| ) -> ParseResult<Input::Range, Input::Error> |
| <span class="kw">where |
| </span>F: FnMut(Input::Token) -> bool, |
| Input: <span class="question-mark">?</span>Sized + RangeStream, |
| { |
| <span class="kw">match </span>input.uncons_while1(predicate) { |
| CommitOk(x) => { |
| <span class="kw">if </span>input.is_partial() && input_at_eof(input) { |
| <span class="comment">// Partial inputs which encounter end of file must fail to let more input be |
| // retrieved |
| </span>CommitErr(Input::Error::from_error( |
| input.position(), |
| StreamError::end_of_input(), |
| )) |
| } <span class="kw">else </span>{ |
| CommitOk(x) |
| } |
| } |
| PeekErr(<span class="kw">_</span>) => { |
| <span class="kw">if </span>input.is_partial() && input_at_eof(input) { |
| <span class="comment">// Partial inputs which encounter end of file must fail to let more input be |
| // retrieved |
| </span>CommitErr(Input::Error::from_error( |
| input.position(), |
| StreamError::end_of_input(), |
| )) |
| } <span class="kw">else </span>{ |
| PeekErr(Input::Error::empty(input.position()).into()) |
| } |
| } |
| CommitErr(err) => { |
| <span class="kw">if </span>input.is_partial() && input_at_eof(input) { |
| <span class="comment">// Partial inputs which encounter end of file must fail to let more input be |
| // retrieved |
| </span>CommitErr(Input::Error::from_error( |
| input.position(), |
| StreamError::end_of_input(), |
| )) |
| } <span class="kw">else </span>{ |
| wrap_stream_error(input, err) |
| } |
| } |
| PeekOk(<span class="kw">_</span>) => <span class="macro">unreachable!</span>(), |
| } |
| } |
| |
| <span class="doccomment">/// Trait representing a range of elements. |
| </span><span class="kw">pub trait </span>Range { |
| <span class="doccomment">/// Returns the remaining length of `self`. |
| /// The returned length need not be the same as the number of items left in the stream. |
| </span><span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize; |
| |
| <span class="doccomment">/// Returns `true` if the range does not contain any elements (`Range::len() == 0`) |
| </span><span class="kw">fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.len() == <span class="number">0 |
| </span>} |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, I> StreamOnce <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>I |
| <span class="kw">where |
| </span>I: StreamOnce + <span class="question-mark">?</span>Sized, |
| { |
| <span class="kw">type </span>Token = I::Token; |
| |
| <span class="kw">type </span>Range = I::Range; |
| |
| <span class="kw">type </span>Position = I::Position; |
| |
| <span class="kw">type </span>Error = I::Error; |
| <span class="kw">fn </span>uncons(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Token, StreamErrorFor<<span class="self">Self</span>>> { |
| (<span class="kw-2">**</span><span class="self">self</span>).uncons() |
| } |
| |
| <span class="kw">fn </span>is_partial(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| (<span class="kw-2">**</span><span class="self">self</span>).is_partial() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, I> Positioned <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>I |
| <span class="kw">where |
| </span>I: Positioned + <span class="question-mark">?</span>Sized, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>position(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Position { |
| (<span class="kw-2">**</span><span class="self">self</span>).position() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, I> ResetStream <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>I |
| <span class="kw">where |
| </span>I: ResetStream + <span class="question-mark">?</span>Sized, |
| { |
| <span class="kw">type </span>Checkpoint = I::Checkpoint; |
| |
| <span class="kw">fn </span>checkpoint(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Checkpoint { |
| (<span class="kw-2">**</span><span class="self">self</span>).checkpoint() |
| } |
| |
| <span class="kw">fn </span>reset(<span class="kw-2">&mut </span><span class="self">self</span>, checkpoint: <span class="self">Self</span>::Checkpoint) -> <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error> { |
| (<span class="kw-2">**</span><span class="self">self</span>).reset(checkpoint) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, I> RangeStreamOnce <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>I |
| <span class="kw">where |
| </span>I: RangeStreamOnce + <span class="question-mark">?</span>Sized, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_while<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| (<span class="kw-2">**</span><span class="self">self</span>).uncons_while(f) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_while1<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> ParseResult<<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| (<span class="kw-2">**</span><span class="self">self</span>).uncons_while1(f) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_range(<span class="kw-2">&mut </span><span class="self">self</span>, size: usize) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> { |
| (<span class="kw-2">**</span><span class="self">self</span>).uncons_range(size) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>distance(<span class="kw-2">&</span><span class="self">self</span>, end: <span class="kw-2">&</span><span class="self">Self</span>::Checkpoint) -> usize { |
| (<span class="kw-2">**</span><span class="self">self</span>).distance(end) |
| } |
| |
| <span class="kw">fn </span>range(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Range { |
| (<span class="kw-2">**</span><span class="self">self</span>).range() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, I> Range <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>I |
| <span class="kw">where |
| </span>I: Range + <span class="question-mark">?</span>Sized, |
| { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| (<span class="kw-2">**</span><span class="self">self</span>).len() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> StreamOnce <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>str { |
| <span class="kw">type </span>Token = char; |
| <span class="kw">type </span>Range = <span class="kw-2">&</span><span class="lifetime">'a </span>str; |
| <span class="kw">type </span>Position = PointerOffset<str>; |
| <span class="kw">type </span>Error = StringStreamError; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><char, StreamErrorFor<<span class="self">Self</span>>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>chars = <span class="self">self</span>.chars(); |
| <span class="kw">match </span>chars.next() { |
| <span class="prelude-val">Some</span>(c) => { |
| <span class="kw-2">*</span><span class="self">self </span>= chars.as_str(); |
| <span class="prelude-val">Ok</span>(c) |
| } |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(StringStreamError::Eoi), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Positioned <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>str { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>position(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Position { |
| PointerOffset::new(<span class="self">self</span>.as_bytes().position().<span class="number">0</span>) |
| } |
| } |
| |
| <span class="attribute">#[allow(clippy::while_let_loop)] |
| </span><span class="kw">fn </span>str_uncons_while<<span class="lifetime">'a</span>, F>(slice: <span class="kw-2">&mut &</span><span class="lifetime">'a </span>str, <span class="kw-2">mut </span>chars: Chars<<span class="lifetime">'a</span>>, <span class="kw-2">mut </span>f: F) -> <span class="kw-2">&</span><span class="lifetime">'a </span>str |
| <span class="kw">where |
| </span>F: FnMut(char) -> bool, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>last_char_size = <span class="number">0</span>; |
| |
| <span class="macro">macro_rules! </span>test_next { |
| () => { |
| <span class="kw">match </span>chars.next() { |
| <span class="prelude-val">Some</span>(c) => { |
| <span class="kw">if </span>!f(c) { |
| last_char_size = c.len_utf8(); |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="prelude-val">None </span>=> <span class="kw">break</span>, |
| } |
| }; |
| } |
| <span class="kw">loop </span>{ |
| <span class="macro">test_next!</span>(); |
| <span class="macro">test_next!</span>(); |
| <span class="macro">test_next!</span>(); |
| <span class="macro">test_next!</span>(); |
| <span class="macro">test_next!</span>(); |
| <span class="macro">test_next!</span>(); |
| <span class="macro">test_next!</span>(); |
| <span class="macro">test_next!</span>(); |
| } |
| |
| <span class="kw">let </span>len = slice.len() - chars.as_str().len() - last_char_size; |
| <span class="kw">let </span>(result, rest) = slice.split_at(len); |
| <span class="kw-2">*</span>slice = rest; |
| result |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> RangeStreamOnce <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>str { |
| <span class="kw">fn </span>uncons_while<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> <span class="prelude-ty">Result</span><<span class="kw-2">&</span><span class="lifetime">'a </span>str, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| <span class="prelude-val">Ok</span>(str_uncons_while(<span class="self">self</span>, <span class="self">self</span>.chars(), f)) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_while1<F>(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>f: F) -> ParseResult<<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>chars = <span class="self">self</span>.chars(); |
| <span class="kw">match </span>chars.next() { |
| <span class="prelude-val">Some</span>(c) => { |
| <span class="kw">if </span>!f(c) { |
| <span class="kw">return </span>PeekErr(Tracked::from(StringStreamError::UnexpectedParse)); |
| } |
| } |
| <span class="prelude-val">None </span>=> <span class="kw">return </span>PeekErr(Tracked::from(StringStreamError::Eoi)), |
| } |
| |
| CommitOk(str_uncons_while(<span class="self">self</span>, chars, f)) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_range(<span class="kw-2">&mut </span><span class="self">self</span>, size: usize) -> <span class="prelude-ty">Result</span><<span class="kw-2">&</span><span class="lifetime">'a </span>str, StreamErrorFor<<span class="self">Self</span>>> { |
| <span class="kw">fn </span>is_char_boundary(s: <span class="kw-2">&</span>str, index: usize) -> bool { |
| <span class="kw">if </span>index == s.len() { |
| <span class="kw">return </span><span class="bool-val">true</span>; |
| } |
| <span class="kw">match </span>s.as_bytes().get(index) { |
| <span class="prelude-val">None </span>=> <span class="bool-val">false</span>, |
| <span class="prelude-val">Some</span>(b) => !(<span class="number">128</span>..=<span class="number">192</span>).contains(b), |
| } |
| } |
| <span class="kw">if </span>size <= <span class="self">self</span>.len() { |
| <span class="kw">if </span>is_char_boundary(<span class="self">self</span>, size) { |
| <span class="kw">let </span>(result, remaining) = <span class="self">self</span>.split_at(size); |
| <span class="kw-2">*</span><span class="self">self </span>= remaining; |
| <span class="prelude-val">Ok</span>(result) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(StringStreamError::CharacterBoundary) |
| } |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(StringStreamError::Eoi) |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>distance(<span class="kw-2">&</span><span class="self">self</span>, end: <span class="kw-2">&</span><span class="self">Self</span>) -> usize { |
| <span class="self">self</span>.position().<span class="number">0 </span>- end.position().<span class="number">0 |
| </span>} |
| |
| <span class="kw">fn </span>range(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Range { |
| <span class="self">self |
| </span>} |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Range <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>str { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| str::len(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> Range <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>[T] { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <[T]>::len(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="attribute">#[repr(usize)] |
| </span><span class="kw">enum </span>UnconsStart { |
| Zero = <span class="number">0</span>, |
| One = <span class="number">1</span>, |
| } |
| |
| <span class="kw">fn </span>slice_uncons_while<<span class="lifetime">'a</span>, T, F>(slice: <span class="kw-2">&mut &</span><span class="lifetime">'a </span>[T], start: UnconsStart, <span class="kw-2">mut </span>f: F) -> <span class="kw-2">&</span><span class="lifetime">'a </span>[T] |
| <span class="kw">where |
| </span>F: FnMut(T) -> bool, |
| T: Clone, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>i = start <span class="kw">as </span>usize; |
| <span class="kw">let </span>len = slice.len(); |
| <span class="comment">// SAFETY: We only call this function with `One` if the slice has length >= 1 |
| </span><span class="macro">debug_assert!</span>(len >= i, <span class="string">""</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>found = <span class="bool-val">false</span>; |
| |
| <span class="macro">macro_rules! </span>check { |
| () => { |
| <span class="kw">if </span>!f(<span class="kw">unsafe </span>{ slice.get_unchecked(i).clone() }) { |
| found = <span class="bool-val">true</span>; |
| <span class="kw">break</span>; |
| } |
| i += <span class="number">1</span>; |
| }; |
| } |
| |
| <span class="comment">// SAFETY: ensures we can access at least 8 elements starting at i, making get_unchecked sound. |
| </span><span class="kw">while </span>len - i >= <span class="number">8 </span>{ |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| } |
| |
| <span class="kw">if </span>!found { |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(c) = slice.get(i) { |
| <span class="kw">if </span>!f(c.clone()) { |
| <span class="kw">break</span>; |
| } |
| i += <span class="number">1</span>; |
| } |
| } |
| |
| <span class="kw">let </span>(result, remaining) = slice.split_at(i); |
| <span class="kw-2">*</span>slice = remaining; |
| result |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> RangeStreamOnce <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>[T] |
| <span class="kw">where |
| </span>T: Clone + PartialEq, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_range(<span class="kw-2">&mut </span><span class="self">self</span>, size: usize) -> <span class="prelude-ty">Result</span><<span class="kw-2">&</span><span class="lifetime">'a </span>[T], StreamErrorFor<<span class="self">Self</span>>> { |
| <span class="kw">if </span>size <= <span class="self">self</span>.len() { |
| <span class="kw">let </span>(result, remaining) = <span class="self">self</span>.split_at(size); |
| <span class="kw-2">*</span><span class="self">self </span>= remaining; |
| <span class="prelude-val">Ok</span>(result) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(UnexpectedParse::Eoi) |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_while<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> <span class="prelude-ty">Result</span><<span class="kw-2">&</span><span class="lifetime">'a </span>[T], StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| <span class="prelude-val">Ok</span>(slice_uncons_while(<span class="self">self</span>, UnconsStart::Zero, f)) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_while1<F>(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>f: F) -> ParseResult<<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| <span class="kw">match </span><span class="self">self</span>.first() { |
| <span class="prelude-val">Some</span>(c) => { |
| <span class="kw">if </span>!f(c.clone()) { |
| <span class="kw">return </span>PeekErr(Tracked::from(UnexpectedParse::Unexpected)); |
| } |
| } |
| <span class="prelude-val">None </span>=> { |
| <span class="kw">return </span>PeekErr(Tracked::from(UnexpectedParse::Eoi)); |
| } |
| } |
| |
| CommitOk(slice_uncons_while(<span class="self">self</span>, UnconsStart::One, f)) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>distance(<span class="kw-2">&</span><span class="self">self</span>, end: <span class="kw-2">&</span><span class="self">Self</span>) -> usize { |
| end.len() - <span class="self">self</span>.len() |
| } |
| |
| <span class="kw">fn </span>range(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Range { |
| <span class="self">self |
| </span>} |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> Positioned <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>[T] |
| <span class="kw">where |
| </span>T: Clone + PartialEq, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>position(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Position { |
| PointerOffset::new(<span class="self">self</span>.as_ptr() <span class="kw">as </span>usize) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> StreamOnce <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>[T] |
| <span class="kw">where |
| </span>T: Clone + PartialEq, |
| { |
| <span class="kw">type </span>Token = T; |
| <span class="kw">type </span>Range = <span class="kw-2">&</span><span class="lifetime">'a </span>[T]; |
| <span class="kw">type </span>Position = PointerOffset<[T]>; |
| <span class="kw">type </span>Error = UnexpectedParse; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><T, StreamErrorFor<<span class="self">Self</span>>> { |
| <span class="kw">match </span><span class="self">self</span>.split_first() { |
| <span class="prelude-val">Some</span>((first, rest)) => { |
| <span class="kw-2">*</span><span class="self">self </span>= rest; |
| <span class="prelude-val">Ok</span>(first.clone()) |
| } |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(UnexpectedParse::Eoi), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Stream type which indicates that the stream is partial if end of input is reached |
| </span><span class="attribute">#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug)] |
| </span><span class="kw">pub struct </span>PartialStream<S>(<span class="kw">pub </span>S); |
| |
| <span class="kw">impl</span><S> From<S> <span class="kw">for </span>PartialStream<S> { |
| <span class="kw">fn </span>from(t: S) -> <span class="self">Self </span>{ |
| PartialStream(t) |
| } |
| } |
| |
| <span class="kw">impl</span><S> Positioned <span class="kw">for </span>PartialStream<S> |
| <span class="kw">where |
| </span>S: Positioned, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>position(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Position { |
| <span class="self">self</span>.<span class="number">0</span>.position() |
| } |
| } |
| |
| <span class="kw">impl</span><S> ResetStream <span class="kw">for </span>PartialStream<S> |
| <span class="kw">where |
| </span>S: ResetStream, |
| { |
| <span class="kw">type </span>Checkpoint = S::Checkpoint; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>checkpoint(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Checkpoint { |
| <span class="self">self</span>.<span class="number">0</span>.checkpoint() |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>reset(<span class="kw-2">&mut </span><span class="self">self</span>, checkpoint: <span class="self">Self</span>::Checkpoint) -> <span class="prelude-ty">Result</span><(), S::Error> { |
| <span class="self">self</span>.<span class="number">0</span>.reset(checkpoint) |
| } |
| } |
| |
| <span class="kw">impl</span><S> StreamOnce <span class="kw">for </span>PartialStream<S> |
| <span class="kw">where |
| </span>S: StreamOnce, |
| { |
| <span class="kw">type </span>Token = S::Token; |
| <span class="kw">type </span>Range = S::Range; |
| <span class="kw">type </span>Position = S::Position; |
| <span class="kw">type </span>Error = S::Error; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><S::Token, StreamErrorFor<<span class="self">Self</span>>> { |
| <span class="self">self</span>.<span class="number">0</span>.uncons() |
| } |
| |
| <span class="kw">fn </span>is_partial(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="bool-val">true |
| </span>} |
| } |
| |
| <span class="kw">impl</span><S> RangeStreamOnce <span class="kw">for </span>PartialStream<S> |
| <span class="kw">where |
| </span>S: RangeStreamOnce, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_range(<span class="kw-2">&mut </span><span class="self">self</span>, size: usize) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> { |
| <span class="self">self</span>.<span class="number">0</span>.uncons_range(size) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_while<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| <span class="self">self</span>.<span class="number">0</span>.uncons_while(f) |
| } |
| |
| <span class="kw">fn </span>uncons_while1<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> ParseResult<<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| <span class="self">self</span>.<span class="number">0</span>.uncons_while1(f) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>distance(<span class="kw-2">&</span><span class="self">self</span>, end: <span class="kw-2">&</span><span class="self">Self</span>::Checkpoint) -> usize { |
| <span class="self">self</span>.<span class="number">0</span>.distance(end) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>range(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Range { |
| <span class="self">self</span>.<span class="number">0</span>.range() |
| } |
| } |
| |
| <span class="doccomment">/// Stream type which indicates that the stream is complete if end of input is reached |
| /// |
| /// For most streams this is already the default but this wrapper can be used to override a nested |
| /// `PartialStream` |
| </span><span class="attribute">#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug)] |
| #[repr(transparent)] |
| </span><span class="kw">pub struct </span>CompleteStream<S>(<span class="kw">pub </span>S); |
| |
| <span class="kw">impl</span><S> From<S> <span class="kw">for </span>CompleteStream<S> { |
| <span class="kw">fn </span>from(t: S) -> <span class="self">Self </span>{ |
| CompleteStream(t) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'s</span>, S> From<<span class="kw-2">&</span><span class="lifetime">'s </span><span class="kw-2">mut </span>S> <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'s </span><span class="kw-2">mut </span>CompleteStream<S> { |
| <span class="kw">fn </span>from(t: <span class="kw-2">&</span><span class="lifetime">'s </span><span class="kw-2">mut </span>S) -> <span class="self">Self </span>{ |
| <span class="comment">// SAFETY repr(transparent) is specified on CompleteStream |
| </span><span class="kw">unsafe </span>{ <span class="kw-2">&mut *</span>(t <span class="kw">as </span><span class="kw-2">*mut </span>S <span class="kw">as </span><span class="kw-2">*mut </span>CompleteStream<S>) } |
| } |
| } |
| |
| <span class="kw">impl</span><S> Positioned <span class="kw">for </span>CompleteStream<S> |
| <span class="kw">where |
| </span>S: Positioned, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>position(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Position { |
| <span class="self">self</span>.<span class="number">0</span>.position() |
| } |
| } |
| |
| <span class="kw">impl</span><S> ResetStream <span class="kw">for </span>CompleteStream<S> |
| <span class="kw">where |
| </span>S: ResetStream, |
| { |
| <span class="kw">type </span>Checkpoint = S::Checkpoint; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>checkpoint(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Checkpoint { |
| <span class="self">self</span>.<span class="number">0</span>.checkpoint() |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>reset(<span class="kw-2">&mut </span><span class="self">self</span>, checkpoint: <span class="self">Self</span>::Checkpoint) -> <span class="prelude-ty">Result</span><(), S::Error> { |
| <span class="self">self</span>.<span class="number">0</span>.reset(checkpoint) |
| } |
| } |
| |
| <span class="kw">impl</span><S> StreamOnce <span class="kw">for </span>CompleteStream<S> |
| <span class="kw">where |
| </span>S: StreamOnce, |
| { |
| <span class="kw">type </span>Token = S::Token; |
| <span class="kw">type </span>Range = S::Range; |
| <span class="kw">type </span>Position = S::Position; |
| <span class="kw">type </span>Error = S::Error; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><S::Token, StreamErrorFor<<span class="self">Self</span>>> { |
| <span class="self">self</span>.<span class="number">0</span>.uncons() |
| } |
| |
| <span class="kw">fn </span>is_partial(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="bool-val">false |
| </span>} |
| } |
| |
| <span class="kw">impl</span><S> RangeStreamOnce <span class="kw">for </span>CompleteStream<S> |
| <span class="kw">where |
| </span>S: RangeStreamOnce, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_range(<span class="kw-2">&mut </span><span class="self">self</span>, size: usize) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> { |
| <span class="self">self</span>.<span class="number">0</span>.uncons_range(size) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_while<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| <span class="self">self</span>.<span class="number">0</span>.uncons_while(f) |
| } |
| |
| <span class="kw">fn </span>uncons_while1<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> ParseResult<<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| <span class="self">self</span>.<span class="number">0</span>.uncons_while1(f) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>distance(<span class="kw-2">&</span><span class="self">self</span>, end: <span class="kw-2">&</span><span class="self">Self</span>::Checkpoint) -> usize { |
| <span class="self">self</span>.<span class="number">0</span>.distance(end) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>range(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Range { |
| <span class="self">self</span>.<span class="number">0</span>.range() |
| } |
| } |
| |
| <span class="attribute">#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug)] |
| </span><span class="kw">pub struct </span>MaybePartialStream<S>(<span class="kw">pub </span>S, <span class="kw">pub </span>bool); |
| |
| <span class="kw">impl</span><S> Positioned <span class="kw">for </span>MaybePartialStream<S> |
| <span class="kw">where |
| </span>S: Positioned, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>position(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Position { |
| <span class="self">self</span>.<span class="number">0</span>.position() |
| } |
| } |
| |
| <span class="kw">impl</span><S> ResetStream <span class="kw">for </span>MaybePartialStream<S> |
| <span class="kw">where |
| </span>S: ResetStream, |
| { |
| <span class="kw">type </span>Checkpoint = S::Checkpoint; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>checkpoint(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Checkpoint { |
| <span class="self">self</span>.<span class="number">0</span>.checkpoint() |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>reset(<span class="kw-2">&mut </span><span class="self">self</span>, checkpoint: <span class="self">Self</span>::Checkpoint) -> <span class="prelude-ty">Result</span><(), S::Error> { |
| <span class="self">self</span>.<span class="number">0</span>.reset(checkpoint) |
| } |
| } |
| |
| <span class="kw">impl</span><S> StreamOnce <span class="kw">for </span>MaybePartialStream<S> |
| <span class="kw">where |
| </span>S: StreamOnce, |
| { |
| <span class="kw">type </span>Token = S::Token; |
| <span class="kw">type </span>Range = S::Range; |
| <span class="kw">type </span>Position = S::Position; |
| <span class="kw">type </span>Error = S::Error; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><S::Token, StreamErrorFor<<span class="self">Self</span>>> { |
| <span class="self">self</span>.<span class="number">0</span>.uncons() |
| } |
| |
| <span class="kw">fn </span>is_partial(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.<span class="number">1 |
| </span>} |
| } |
| |
| <span class="kw">impl</span><S> RangeStreamOnce <span class="kw">for </span>MaybePartialStream<S> |
| <span class="kw">where |
| </span>S: RangeStreamOnce, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_range(<span class="kw-2">&mut </span><span class="self">self</span>, size: usize) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> { |
| <span class="self">self</span>.<span class="number">0</span>.uncons_range(size) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_while<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| <span class="self">self</span>.<span class="number">0</span>.uncons_while(f) |
| } |
| |
| <span class="kw">fn </span>uncons_while1<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> ParseResult<<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| <span class="self">self</span>.<span class="number">0</span>.uncons_while1(f) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>distance(<span class="kw-2">&</span><span class="self">self</span>, end: <span class="kw-2">&</span><span class="self">Self</span>::Checkpoint) -> usize { |
| <span class="self">self</span>.<span class="number">0</span>.distance(end) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>range(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Range { |
| <span class="self">self</span>.<span class="number">0</span>.range() |
| } |
| } |
| |
| <span class="doccomment">/// Newtype for constructing a stream from a slice where the items in the slice are not copyable. |
| </span><span class="attribute">#[derive(Copy, Eq, PartialEq, Ord, PartialOrd, Debug)] |
| </span><span class="kw">pub struct </span>SliceStream<<span class="lifetime">'a</span>, T>(<span class="kw">pub </span><span class="kw-2">&</span><span class="lifetime">'a </span>[T]); |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> Clone <span class="kw">for </span>SliceStream<<span class="lifetime">'a</span>, T> { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> SliceStream<<span class="lifetime">'a</span>, T> { |
| SliceStream(<span class="self">self</span>.<span class="number">0</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> Positioned <span class="kw">for </span>SliceStream<<span class="lifetime">'a</span>, T> |
| <span class="kw">where |
| </span>T: PartialEq + <span class="lifetime">'a</span>, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>position(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Position { |
| PointerOffset::new(<span class="self">self</span>.<span class="number">0</span>.as_ptr() <span class="kw">as </span>usize) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> StreamOnce <span class="kw">for </span>SliceStream<<span class="lifetime">'a</span>, T> |
| <span class="kw">where |
| </span>T: PartialEq + <span class="lifetime">'a</span>, |
| { |
| <span class="kw">type </span>Token = <span class="kw-2">&</span><span class="lifetime">'a </span>T; |
| <span class="kw">type </span>Range = <span class="kw-2">&</span><span class="lifetime">'a </span>[T]; |
| <span class="kw">type </span>Position = PointerOffset<[T]>; |
| <span class="kw">type </span>Error = UnexpectedParse; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="kw-2">&</span><span class="lifetime">'a </span>T, StreamErrorFor<<span class="self">Self</span>>> { |
| <span class="kw">match </span><span class="self">self</span>.<span class="number">0</span>.split_first() { |
| <span class="prelude-val">Some</span>((first, rest)) => { |
| <span class="self">self</span>.<span class="number">0 </span>= rest; |
| <span class="prelude-val">Ok</span>(first) |
| } |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(UnexpectedParse::Eoi), |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>slice_uncons_while_ref<<span class="lifetime">'a</span>, T, F>(slice: <span class="kw-2">&mut &</span><span class="lifetime">'a </span>[T], start: UnconsStart, <span class="kw-2">mut </span>f: F) -> <span class="kw-2">&</span><span class="lifetime">'a </span>[T] |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&</span><span class="lifetime">'a </span>T) -> bool, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>i = start <span class="kw">as </span>usize; |
| <span class="kw">let </span>len = slice.len(); |
| <span class="comment">// SAFETY: We only call this function with `One` if the slice has length >= 1 |
| </span><span class="macro">debug_assert!</span>(len >= i, <span class="string">""</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>found = <span class="bool-val">false</span>; |
| |
| <span class="macro">macro_rules! </span>check { |
| () => { |
| <span class="kw">if </span>!f(<span class="kw">unsafe </span>{ slice.get_unchecked(i) }) { |
| found = <span class="bool-val">true</span>; |
| <span class="kw">break</span>; |
| } |
| i += <span class="number">1</span>; |
| }; |
| } |
| |
| <span class="comment">// SAFETY: ensures we can access at least 8 elements starting at i, making get_unchecked sound. |
| </span><span class="kw">while </span>len - i >= <span class="number">8 </span>{ |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| <span class="macro">check!</span>(); |
| } |
| |
| <span class="kw">if </span>!found { |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(c) = slice.get(i) { |
| <span class="kw">if </span>!f(c) { |
| <span class="kw">break</span>; |
| } |
| i += <span class="number">1</span>; |
| } |
| } |
| |
| <span class="kw">let </span>(result, remaining) = slice.split_at(i); |
| <span class="kw-2">*</span>slice = remaining; |
| result |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> RangeStreamOnce <span class="kw">for </span>SliceStream<<span class="lifetime">'a</span>, T> |
| <span class="kw">where |
| </span>T: PartialEq + <span class="lifetime">'a</span>, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_range(<span class="kw-2">&mut </span><span class="self">self</span>, size: usize) -> <span class="prelude-ty">Result</span><<span class="kw-2">&</span><span class="lifetime">'a </span>[T], StreamErrorFor<<span class="self">Self</span>>> { |
| <span class="kw">if </span>size <= <span class="self">self</span>.<span class="number">0</span>.len() { |
| <span class="kw">let </span>(range, rest) = <span class="self">self</span>.<span class="number">0</span>.split_at(size); |
| <span class="self">self</span>.<span class="number">0 </span>= rest; |
| <span class="prelude-val">Ok</span>(range) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(UnexpectedParse::Eoi) |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_while<F>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) -> <span class="prelude-ty">Result</span><<span class="kw-2">&</span><span class="lifetime">'a </span>[T], StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| <span class="prelude-val">Ok</span>(slice_uncons_while_ref(<span class="kw-2">&mut </span><span class="self">self</span>.<span class="number">0</span>, UnconsStart::Zero, f)) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons_while1<F>(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>f: F) -> ParseResult<<span class="self">Self</span>::Range, StreamErrorFor<<span class="self">Self</span>>> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Token) -> bool, |
| { |
| <span class="kw">match </span><span class="self">self</span>.<span class="number">0</span>.first() { |
| <span class="prelude-val">Some</span>(c) => { |
| <span class="kw">if </span>!f(c) { |
| <span class="kw">return </span>PeekErr(Tracked::from(UnexpectedParse::Unexpected)); |
| } |
| } |
| <span class="prelude-val">None </span>=> <span class="kw">return </span>PeekErr(Tracked::from(UnexpectedParse::Eoi)), |
| } |
| |
| CommitOk(slice_uncons_while_ref(<span class="kw-2">&mut </span><span class="self">self</span>.<span class="number">0</span>, UnconsStart::One, f)) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>distance(<span class="kw-2">&</span><span class="self">self</span>, end: <span class="kw-2">&</span><span class="self">Self</span>) -> usize { |
| end.<span class="number">0</span>.len() - <span class="self">self</span>.<span class="number">0</span>.len() |
| } |
| |
| <span class="kw">fn </span>range(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Range { |
| <span class="self">self</span>.<span class="number">0 |
| </span>} |
| } |
| |
| <span class="doccomment">/// Wrapper around iterators which allows them to be treated as a stream. |
| /// Returned by [`IteratorStream::new`]. |
| </span><span class="attribute">#[derive(Copy, Clone, Debug)] |
| </span><span class="kw">pub struct </span>IteratorStream<Input>(Input); |
| |
| <span class="kw">impl</span><Input> IteratorStream<Input> |
| <span class="kw">where |
| </span>Input: Iterator, |
| { |
| <span class="doccomment">/// Converts an `Iterator` into a stream. |
| /// |
| /// NOTE: This type do not implement `Positioned` and `Clone` and must be wrapped with types |
| /// such as `BufferedStreamRef` and `State` to become a `Stream` which can be parsed |
| </span><span class="kw">pub fn </span>new<T>(iter: T) -> IteratorStream<Input> |
| <span class="kw">where |
| </span>T: IntoIterator<IntoIter = Input, Item = Input::Item>, |
| { |
| IteratorStream(iter.into_iter()) |
| } |
| } |
| |
| <span class="kw">impl</span><Input> Iterator <span class="kw">for </span>IteratorStream<Input> |
| <span class="kw">where |
| </span>Input: Iterator, |
| { |
| <span class="kw">type </span>Item = Input::Item; |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Input::Item> { |
| <span class="self">self</span>.<span class="number">0</span>.next() |
| } |
| } |
| |
| <span class="kw">impl</span><Input: Iterator> StreamOnce <span class="kw">for </span>IteratorStream<Input> |
| <span class="kw">where |
| </span>Input::Item: Clone + PartialEq, |
| { |
| <span class="kw">type </span>Token = Input::Item; |
| <span class="kw">type </span>Range = Input::Item; |
| <span class="kw">type </span>Position = (); |
| <span class="kw">type </span>Error = UnexpectedParse; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>uncons(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Token, StreamErrorFor<<span class="self">Self</span>>> { |
| <span class="kw">match </span><span class="self">self</span>.next() { |
| <span class="prelude-val">Some</span>(x) => <span class="prelude-val">Ok</span>(x), |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(UnexpectedParse::Eoi), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Newtype around a pointer offset into a slice stream (`&[T]`/`&str`). |
| </span><span class="kw">pub struct </span>PointerOffset<T: <span class="question-mark">?</span>Sized>(<span class="kw">pub </span>usize, PhantomData<T>); |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> Clone <span class="kw">for </span>PointerOffset<T> { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| PointerOffset::new(<span class="self">self</span>.<span class="number">0</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> Copy <span class="kw">for </span>PointerOffset<T> {} |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> Default <span class="kw">for </span>PointerOffset<T> { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| PointerOffset::new(<span class="number">0</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> PartialEq <span class="kw">for </span>PointerOffset<T> { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <span class="self">self</span>.<span class="number">0 </span>== other.<span class="number">0 |
| </span>} |
| } |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> Eq <span class="kw">for </span>PointerOffset<T> {} |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> PartialOrd <span class="kw">for </span>PointerOffset<T> { |
| <span class="kw">fn </span>partial_cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="prelude-ty">Option</span><Ordering> { |
| <span class="self">self</span>.<span class="number">0</span>.partial_cmp(<span class="kw-2">&</span>other.<span class="number">0</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> Ord <span class="kw">for </span>PointerOffset<T> { |
| <span class="kw">fn </span>cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> Ordering { |
| <span class="self">self</span>.<span class="number">0</span>.cmp(<span class="kw-2">&</span>other.<span class="number">0</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T> fmt::Debug <span class="kw">for </span>PointerOffset<T> |
| <span class="kw">where |
| </span>T: <span class="question-mark">?</span>Sized, |
| { |
| <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>) |
| } |
| } |
| |
| <span class="kw">impl</span><T> fmt::Display <span class="kw">for </span>PointerOffset<T> |
| <span class="kw">where |
| </span>T: <span class="question-mark">?</span>Sized, |
| { |
| <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">"PointerOffset({:?})"</span>, <span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span><span class="kw-2">*const </span>()) |
| } |
| } |
| |
| <span class="kw">impl</span><T> PointerOffset<T> |
| <span class="kw">where |
| </span>T: <span class="question-mark">?</span>Sized, |
| { |
| <span class="kw">pub fn </span>new(offset: usize) -> <span class="self">Self </span>{ |
| PointerOffset(offset, PhantomData) |
| } |
| |
| <span class="doccomment">/// Converts the pointer-based position into an indexed position. |
| /// |
| /// ```rust |
| /// # extern crate combine; |
| /// # use combine::*; |
| /// # fn main() { |
| /// let text = "b"; |
| /// let err = token('a').easy_parse(text).unwrap_err(); |
| /// assert_eq!(err.position.0, text.as_ptr() as usize); |
| /// assert_eq!(err.map_position(|p| p.translate_position(text)).position, 0); |
| /// # } |
| /// ``` |
| </span><span class="kw">pub fn </span>translate_position(<span class="kw-2">mut </span><span class="self">self</span>, initial_slice: <span class="kw-2">&</span>T) -> usize { |
| <span class="self">self</span>.<span class="number">0 </span>-= initial_slice <span class="kw">as </span><span class="kw-2">*const </span>T <span class="kw">as </span><span class="kw-2">*const </span>() <span class="kw">as </span>usize; |
| <span class="self">self</span>.<span class="number">0 |
| </span>} |
| } |
| |
| <span class="doccomment">/// Decodes `input` using `parser`. |
| /// |
| /// Return `Ok(Some(token), committed_data)` if there was enough data to finish parsing using |
| /// `parser`. |
| /// Returns `Ok(None, committed_data)` if `input` did not contain enough data to finish parsing |
| /// using `parser`. |
| /// |
| /// See `examples/async.rs` for example usage in a `tokio_io::codec::Decoder` |
| </span><span class="kw">pub fn </span>decode<Input, P>( |
| <span class="kw-2">mut </span>parser: P, |
| input: <span class="kw-2">&mut </span>Input, |
| partial_state: <span class="kw-2">&mut </span>P::PartialState, |
| ) -> <span class="prelude-ty">Result</span><(<span class="prelude-ty">Option</span><P::Output>, usize), <Input <span class="kw">as </span>StreamOnce>::Error> |
| <span class="kw">where |
| </span>P: Parser<Input>, |
| Input: RangeStream, |
| { |
| <span class="kw">let </span>start = input.checkpoint(); |
| <span class="kw">match </span>parser.parse_with_state(input, partial_state) { |
| <span class="prelude-val">Ok</span>(message) => <span class="prelude-val">Ok</span>((<span class="prelude-val">Some</span>(message), input.distance(<span class="kw-2">&</span>start))), |
| <span class="prelude-val">Err</span>(err) => { |
| <span class="kw">if </span>err.is_unexpected_end_of_input() { |
| <span class="kw">if </span>input.is_partial() { |
| <span class="comment">// The parser expected more input to parse and input is partial, return `None` |
| // as we did not finish and also return how much may be removed from the stream |
| </span><span class="prelude-val">Ok</span>((<span class="prelude-val">None</span>, input.distance(<span class="kw-2">&</span>start))) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(err) |
| } |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(err) |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Decodes `input` using `parser`. Like `decode` but works directly in both |
| /// `tokio_util::Decoder::decode` and `tokio_util::Decoder::decode_eof` |
| /// |
| /// Return `Ok(Some(token), committed_data)` if there was enough data to finish parsing using |
| /// `parser`. |
| /// Returns `Ok(None, committed_data)` if `input` did not contain enough data to finish parsing |
| /// using `parser`. |
| /// Returns `Ok(None, 0)` if `input` did not contain enough data to finish parsing |
| /// using `parser`. |
| /// |
| /// See `examples/async.rs` for example usage in a `tokio_io::codec::Decoder` |
| </span><span class="kw">pub fn </span>decode_tokio<Input, P>( |
| <span class="kw-2">mut </span>parser: P, |
| input: <span class="kw-2">&mut </span>Input, |
| partial_state: <span class="kw-2">&mut </span>P::PartialState, |
| ) -> <span class="prelude-ty">Result</span><(<span class="prelude-ty">Option</span><P::Output>, usize), <Input <span class="kw">as </span>StreamOnce>::Error> |
| <span class="kw">where |
| </span>P: Parser<Input>, |
| Input: RangeStream, |
| { |
| <span class="kw">let </span>start = input.checkpoint(); |
| <span class="kw">match </span>parser.parse_with_state(input, partial_state) { |
| <span class="prelude-val">Ok</span>(message) => <span class="prelude-val">Ok</span>((<span class="prelude-val">Some</span>(message), input.distance(<span class="kw-2">&</span>start))), |
| <span class="prelude-val">Err</span>(err) => { |
| <span class="kw">if </span>err.is_unexpected_end_of_input() { |
| <span class="kw">if </span>input.is_partial() { |
| <span class="comment">// The parser expected more input to parse and input is partial, return `None` |
| // as we did not finish and also return how much may be removed from the stream |
| </span><span class="prelude-val">Ok</span>((<span class="prelude-val">None</span>, input.distance(<span class="kw-2">&</span>start))) |
| } <span class="kw">else if </span>input_at_eof(input) && input.distance(<span class="kw-2">&</span>start) == <span class="number">0 </span>{ |
| <span class="comment">// We are at eof and the input is empty, return None to indicate that we are |
| // done |
| </span><span class="prelude-val">Ok</span>((<span class="prelude-val">None</span>, <span class="number">0</span>)) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(err) |
| } |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(err) |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Parses an instance of `std::io::Read` as a `&[u8]` without reading the entire file into |
| /// memory. |
| /// |
| /// This is defined as a macro to work around the lack of Higher Ranked Types. See the |
| /// example for how to pass a parser to the macro (constructing parts of the parser outside of |
| /// the `decode!` call is unlikely to work. |
| /// |
| /// ``` |
| /// use std::{ |
| /// fs::File, |
| /// }; |
| /// use combine::{decode, satisfy, skip_many1, many1, sep_end_by, Parser, stream::Decoder}; |
| /// |
| /// let mut read = File::open("README.md").unwrap(); |
| /// let mut decoder = Decoder::new(); |
| /// let is_whitespace = |b: u8| b == b' ' || b == b'\r' || b == b'\n'; |
| /// assert_eq!( |
| /// decode!( |
| /// decoder, |
| /// read, |
| /// { |
| /// let word = many1(satisfy(|b| !is_whitespace(b))); |
| /// sep_end_by(word, skip_many1(satisfy(is_whitespace))).map(|words: Vec<Vec<u8>>| words.len()) |
| /// }, |
| /// |input, _position| combine::easy::Stream::from(input), |
| /// ).map_err(combine::easy::Errors::<u8, &[u8], _>::from), |
| /// Ok(824), |
| /// ); |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>decode { |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="macro-nonterminal">$</span><span class="macro">crate::decode!</span>(<span class="macro-nonterminal">$decoder</span>, <span class="macro-nonterminal">$read</span>, <span class="macro-nonterminal">$parser</span>, |input, _position| input, |x| x) |
| }; |
| |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr, <span class="macro-nonterminal">$input_stream</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="macro-nonterminal">$</span><span class="macro">crate::decode!</span>(<span class="macro-nonterminal">$decoder</span>, <span class="macro-nonterminal">$read</span>, <span class="macro-nonterminal">$parser</span>, <span class="macro-nonterminal">$input_stream</span>, |x| x) |
| }; |
| |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr, <span class="macro-nonterminal">$input_stream</span>: expr, <span class="macro-nonterminal">$post_decode</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="kw">match </span><span class="macro-nonterminal">$decoder </span>{ |
| <span class="kw-2">ref mut </span>decoder => <span class="kw">match </span><span class="macro-nonterminal">$read </span>{ |
| <span class="kw-2">ref mut </span>read => <span class="lifetime">'outer</span>: <span class="kw">loop </span>{ |
| <span class="kw">let </span>(opt, removed) = { |
| <span class="kw">let </span>(state, position, buffer, end_of_input) = decoder.__inner(); |
| <span class="kw">let </span>buffer = |
| <span class="macro-nonterminal">$crate::stream::buf_reader::CombineBuffer::buffer</span>(buffer, read); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>stream = <span class="macro-nonterminal">$crate::stream::call_with2</span>( |
| <span class="macro-nonterminal">$crate::stream::MaybePartialStream</span>(buffer, !end_of_input), |
| <span class="kw-2">*</span>position, |
| <span class="macro-nonterminal">$input_stream</span>, |
| ); |
| <span class="kw">let </span>result = <span class="macro-nonterminal">$crate::stream::decode</span>(<span class="macro-nonterminal">$parser</span>, <span class="kw-2">&mut </span>stream, state); |
| <span class="kw-2">*</span>position = <span class="macro-nonterminal">$crate::stream::Positioned::position</span>(<span class="kw-2">&</span>stream); |
| <span class="macro-nonterminal">$crate::stream::call_with</span>(stream, <span class="macro-nonterminal">$post_decode</span>); |
| <span class="kw">match </span>result { |
| <span class="prelude-val">Ok</span>(x) => x, |
| <span class="prelude-val">Err</span>(err) => { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Err</span>(<span class="macro-nonterminal">$crate::stream::decoder::Error::Parse</span>(err)) |
| } |
| } |
| }; |
| |
| decoder.advance(<span class="kw-2">&mut *</span>read, removed); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = opt { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Ok</span>(v); |
| } |
| |
| <span class="kw">match </span>decoder.__before_parse(<span class="kw-2">&mut *</span>read) { |
| <span class="prelude-val">Ok</span>(x) => x, |
| <span class="prelude-val">Err</span>(error) => { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Err</span>(<span class="macro-nonterminal">$crate::stream::decoder::Error::Io </span>{ |
| error, |
| position: Clone::clone(decoder.position()), |
| }) |
| } |
| }; |
| }, |
| }, |
| } |
| }; |
| } |
| |
| <span class="doccomment">/// Parses an instance of `futures::io::AsyncRead` as a `&[u8]` without reading the entire file into |
| /// memory. |
| /// |
| /// This is defined as a macro to work around the lack of Higher Ranked Types. See the |
| /// example for how to pass a parser to the macro (constructing parts of the parser outside of |
| /// the `decode!` call is unlikely to work. |
| /// |
| /// ``` |
| /// # use futures_03_dep as futures; |
| /// use futures::pin_mut; |
| /// use async_std::{ |
| /// fs::File, |
| /// task, |
| /// }; |
| /// |
| /// use combine::{decode_futures_03, satisfy, skip_many1, many1, sep_end_by, Parser, stream::Decoder}; |
| /// |
| /// fn main() { |
| /// task::block_on(main_()); |
| /// } |
| /// |
| /// async fn main_() { |
| /// let mut read = File::open("README.md").await.unwrap(); |
| /// let mut decoder = Decoder::new(); |
| /// let is_whitespace = |b: u8| b == b' ' || b == b'\r' || b == b'\n'; |
| /// assert_eq!( |
| /// decode_futures_03!( |
| /// decoder, |
| /// read, |
| /// { |
| /// let word = many1(satisfy(|b| !is_whitespace(b))); |
| /// sep_end_by(word, skip_many1(satisfy(is_whitespace))).map(|words: Vec<Vec<u8>>| words.len()) |
| /// }, |
| /// |input, _position| combine::easy::Stream::from(input), |
| /// ).map_err(combine::easy::Errors::<u8, &[u8], _>::from), |
| /// Ok(824), |
| /// ); |
| /// } |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"futures-io-03"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"futures-io-03"</span>)))] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>decode_futures_03 { |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr) => { |
| <span class="macro-nonterminal">$</span><span class="macro">crate::decode_futures_03!</span>(<span class="macro-nonterminal">$decoder</span>, <span class="macro-nonterminal">$read</span>, <span class="macro-nonterminal">$parser</span>, |x| x $(,)<span class="question-mark">?</span>) |
| }; |
| |
| |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr, <span class="macro-nonterminal">$input_stream</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="macro-nonterminal">$</span><span class="macro">crate::decode_futures_03!</span>(<span class="macro-nonterminal">$decoder</span>, <span class="macro-nonterminal">$read</span>, <span class="macro-nonterminal">$parser</span>, <span class="macro-nonterminal">$input_stream</span>, |x| x) |
| }; |
| |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr, <span class="macro-nonterminal">$input_stream</span>: expr, <span class="macro-nonterminal">$post_decode</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="kw">match </span><span class="macro-nonterminal">$decoder </span>{ |
| <span class="kw-2">ref mut </span>decoder => <span class="kw">match </span><span class="macro-nonterminal">$read </span>{ |
| <span class="kw-2">ref mut </span>read => <span class="lifetime">'outer</span>: <span class="kw">loop </span>{ |
| <span class="kw">let </span>(opt, removed) = { |
| <span class="kw">let </span>(state, position, buffer, end_of_input) = decoder.__inner(); |
| <span class="kw">let </span>buffer = |
| <span class="macro-nonterminal">$crate::stream::buf_reader::CombineBuffer::buffer</span>(buffer, <span class="kw-2">&*</span>read); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>stream = <span class="macro-nonterminal">$crate::stream::call_with2</span>( |
| <span class="macro-nonterminal">$crate::stream::MaybePartialStream</span>(buffer, !end_of_input), |
| <span class="kw-2">*</span>position, |
| <span class="macro-nonterminal">$input_stream</span>, |
| ); |
| <span class="kw">let </span>result = <span class="macro-nonterminal">$crate::stream::decode</span>(<span class="macro-nonterminal">$parser</span>, <span class="kw-2">&mut </span>stream, state); |
| <span class="kw-2">*</span>position = <span class="macro-nonterminal">$crate::stream::Positioned::position</span>(<span class="kw-2">&</span>stream); |
| <span class="macro-nonterminal">$crate::stream::call_with</span>(stream, <span class="macro-nonterminal">$post_decode</span>); |
| <span class="kw">match </span>result { |
| <span class="prelude-val">Ok</span>(x) => x, |
| <span class="prelude-val">Err</span>(err) => <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Err</span>(<span class="macro-nonterminal">$crate::stream::decoder::Error::Parse</span>(err)), |
| } |
| }; |
| |
| decoder.advance_pin(std::pin::Pin::new(<span class="kw-2">&mut *</span>read), removed); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = opt { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Ok</span>(v); |
| } |
| |
| |
| <span class="kw">match </span>decoder.__before_parse_async(std::pin::Pin::new(<span class="kw-2">&mut *</span>read)).<span class="kw">await </span>{ |
| <span class="prelude-val">Ok</span>(<span class="kw">_</span>) => (), |
| <span class="prelude-val">Err</span>(error) => { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Err</span>(<span class="macro-nonterminal">$crate::stream::decoder::Error::Io </span>{ |
| error, |
| position: Clone::clone(decoder.position()), |
| }) |
| } |
| }; |
| } |
| } |
| } |
| }; |
| } |
| |
| <span class="doccomment">/// Parses an instance of `tokio::io::AsyncRead` as a `&[u8]` without reading the entire file into |
| /// memory. |
| /// |
| /// This is defined as a macro to work around the lack of Higher Ranked Types. See the |
| /// example for how to pass a parser to the macro (constructing parts of the parser outside of |
| /// the `decode!` call is unlikely to work. |
| /// |
| /// ``` |
| /// # use tokio_02_dep as tokio; |
| /// # use futures_03_dep as futures; |
| /// use futures::pin_mut; |
| /// use tokio::{ |
| /// fs::File, |
| /// }; |
| /// |
| /// use combine::{decode_tokio_02, satisfy, skip_many1, many1, sep_end_by, Parser, stream::{Decoder, buf_reader::BufReader}}; |
| /// |
| /// #[tokio::main] |
| /// async fn main() { |
| /// let mut read = BufReader::new(File::open("README.md").await.unwrap()); |
| /// let mut decoder = Decoder::new_bufferless(); |
| /// let is_whitespace = |b: u8| b == b' ' || b == b'\r' || b == b'\n'; |
| /// assert_eq!( |
| /// decode_tokio_02!( |
| /// decoder, |
| /// read, |
| /// { |
| /// let word = many1(satisfy(|b| !is_whitespace(b))); |
| /// sep_end_by(word, skip_many1(satisfy(is_whitespace))).map(|words: Vec<Vec<u8>>| words.len()) |
| /// }, |
| /// |input, _position| combine::easy::Stream::from(input), |
| /// ).map_err(combine::easy::Errors::<u8, &[u8], _>::from), |
| /// Ok(824), |
| /// ); |
| /// } |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"tokio-02"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"tokio-02"</span>)))] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>decode_tokio_02 { |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="macro-nonterminal">$</span><span class="macro">crate::decode_tokio_02!</span>(<span class="macro-nonterminal">$decoder</span>, <span class="macro-nonterminal">$read</span>, <span class="macro-nonterminal">$parser</span>, |input, _position| input) |
| }; |
| |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr, <span class="macro-nonterminal">$input_stream</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="macro-nonterminal">$</span><span class="macro">crate::decode_tokio_02!</span>(<span class="macro-nonterminal">$decoder</span>, <span class="macro-nonterminal">$read</span>, <span class="macro-nonterminal">$parser</span>, <span class="macro-nonterminal">$input_stream</span>, |x| x) |
| }; |
| |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr, <span class="macro-nonterminal">$input_stream</span>: expr, <span class="macro-nonterminal">$post_decode</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="kw">match </span><span class="macro-nonterminal">$decoder </span>{ |
| <span class="kw-2">ref mut </span>decoder => <span class="kw">match </span><span class="macro-nonterminal">$read </span>{ |
| <span class="kw-2">ref mut </span>read => <span class="lifetime">'outer</span>: <span class="kw">loop </span>{ |
| <span class="kw">let </span>(opt, removed) = { |
| <span class="kw">let </span>(state, position, buffer, end_of_input) = decoder.__inner(); |
| <span class="kw">let </span>buffer = |
| <span class="macro-nonterminal">$crate::stream::buf_reader::CombineBuffer::buffer</span>(buffer, <span class="kw-2">&*</span>read); |
| <span class="kw">let </span><span class="kw-2">mut </span>stream = <span class="macro-nonterminal">$crate::stream::call_with2</span>( |
| <span class="macro-nonterminal">$crate::stream::MaybePartialStream</span>(buffer, !end_of_input), |
| <span class="kw-2">*</span>position, |
| <span class="macro-nonterminal">$input_stream</span>, |
| ); |
| <span class="kw">let </span>result = <span class="macro-nonterminal">$crate::stream::decode</span>(<span class="macro-nonterminal">$parser</span>, <span class="kw-2">&mut </span>stream, state); |
| <span class="kw-2">*</span>position = <span class="macro-nonterminal">$crate::stream::Positioned::position</span>(<span class="kw-2">&</span>stream); |
| <span class="macro-nonterminal">$crate::stream::call_with</span>(stream, <span class="macro-nonterminal">$post_decode</span>); |
| <span class="kw">match </span>result { |
| <span class="prelude-val">Ok</span>(x) => x, |
| <span class="prelude-val">Err</span>(err) => { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Err</span>(<span class="macro-nonterminal">$crate::stream::decoder::Error::Parse</span>(err)) |
| } |
| } |
| }; |
| |
| decoder.advance_pin(std::pin::Pin::new(read), removed); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = opt { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Ok</span>(v); |
| } |
| |
| <span class="kw">match </span>decoder |
| .__before_parse_tokio_02(std::pin::Pin::new(<span class="kw-2">&mut *</span>read)) |
| .<span class="kw">await |
| </span>{ |
| <span class="prelude-val">Ok</span>(x) => x, |
| <span class="prelude-val">Err</span>(error) => { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Err</span>(<span class="macro-nonterminal">$crate::stream::decoder::Error::Io </span>{ |
| error, |
| position: Clone::clone(decoder.position()), |
| }) |
| } |
| }; |
| }, |
| }, |
| } |
| }; |
| } |
| |
| <span class="doccomment">/// Parses an instance of `tokio::io::AsyncRead` as a `&[u8]` without reading the entire file into |
| /// memory. |
| /// |
| /// This is defined as a macro to work around the lack of Higher Ranked Types. See the |
| /// example for how to pass a parser to the macro (constructing parts of the parser outside of |
| /// the `decode!` call is unlikely to work. |
| /// |
| /// ``` |
| /// # use tokio_03_dep as tokio; |
| /// # use futures_03_dep as futures; |
| /// use futures::pin_mut; |
| /// use tokio::{ |
| /// fs::File, |
| /// }; |
| /// |
| /// use combine::{decode_tokio_03, satisfy, skip_many1, many1, sep_end_by, Parser, stream::{Decoder, buf_reader::BufReader}}; |
| /// |
| /// #[tokio::main] |
| /// async fn main() { |
| /// let mut read = BufReader::new(File::open("README.md").await.unwrap()); |
| /// let mut decoder = Decoder::new_bufferless(); |
| /// let is_whitespace = |b: u8| b == b' ' || b == b'\r' || b == b'\n'; |
| /// assert_eq!( |
| /// decode_tokio_03!( |
| /// decoder, |
| /// read, |
| /// { |
| /// let word = many1(satisfy(|b| !is_whitespace(b))); |
| /// sep_end_by(word, skip_many1(satisfy(is_whitespace))).map(|words: Vec<Vec<u8>>| words.len()) |
| /// }, |
| /// |input, _position| combine::easy::Stream::from(input), |
| /// ).map_err(combine::easy::Errors::<u8, &[u8], _>::from), |
| /// Ok(824), |
| /// ); |
| /// } |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"tokio-03"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"tokio-03"</span>)))] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>decode_tokio_03 { |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="macro-nonterminal">$</span><span class="macro">crate::decode_tokio_03!</span>(<span class="macro-nonterminal">$decoder</span>, <span class="macro-nonterminal">$read</span>, <span class="macro-nonterminal">$parser</span>, |input, _position| input) |
| }; |
| |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr, <span class="macro-nonterminal">$input_stream</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="macro-nonterminal">$</span><span class="macro">crate::decode_tokio_03!</span>(<span class="macro-nonterminal">$decoder</span>, <span class="macro-nonterminal">$read</span>, <span class="macro-nonterminal">$parser</span>, <span class="macro-nonterminal">$input_stream</span>, |x| x) |
| }; |
| |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr, <span class="macro-nonterminal">$input_stream</span>: expr, <span class="macro-nonterminal">$post_decode</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="kw">match </span><span class="macro-nonterminal">$decoder </span>{ |
| <span class="kw-2">ref mut </span>decoder => <span class="kw">match </span><span class="macro-nonterminal">$read </span>{ |
| <span class="kw-2">ref mut </span>read => <span class="lifetime">'outer</span>: <span class="kw">loop </span>{ |
| <span class="kw">let </span>(opt, removed) = { |
| <span class="kw">let </span>(state, position, buffer, end_of_input) = decoder.__inner(); |
| <span class="kw">let </span>buffer = |
| <span class="macro-nonterminal">$crate::stream::buf_reader::CombineBuffer::buffer</span>(buffer, <span class="kw-2">&*</span>read); |
| <span class="kw">let </span><span class="kw-2">mut </span>stream = <span class="macro-nonterminal">$crate::stream::call_with2</span>( |
| <span class="macro-nonterminal">$crate::stream::MaybePartialStream</span>(buffer, !end_of_input), |
| <span class="kw-2">*</span>position, |
| <span class="macro-nonterminal">$input_stream</span>, |
| ); |
| <span class="kw">let </span>result = <span class="macro-nonterminal">$crate::stream::decode</span>(<span class="macro-nonterminal">$parser</span>, <span class="kw-2">&mut </span>stream, state); |
| <span class="kw-2">*</span>position = <span class="macro-nonterminal">$crate::stream::Positioned::position</span>(<span class="kw-2">&</span>stream); |
| <span class="macro-nonterminal">$crate::stream::call_with</span>(stream, <span class="macro-nonterminal">$post_decode</span>); |
| <span class="kw">match </span>result { |
| <span class="prelude-val">Ok</span>(x) => x, |
| <span class="prelude-val">Err</span>(err) => { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Err</span>(<span class="macro-nonterminal">$crate::stream::decoder::Error::Parse</span>(err)) |
| } |
| } |
| }; |
| |
| decoder.advance_pin(std::pin::Pin::new(read), removed); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = opt { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Ok</span>(v); |
| } |
| |
| <span class="kw">match </span>decoder |
| .__before_parse_tokio_03(std::pin::Pin::new(<span class="kw-2">&mut *</span>read)) |
| .<span class="kw">await |
| </span>{ |
| <span class="prelude-val">Ok</span>(x) => x, |
| <span class="prelude-val">Err</span>(error) => { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Err</span>(<span class="macro-nonterminal">$crate::stream::decoder::Error::Io </span>{ |
| error, |
| position: Clone::clone(decoder.position()), |
| }) |
| } |
| }; |
| }, |
| }, |
| } |
| }; |
| } |
| |
| <span class="doccomment">/// Parses an instance of `tokio::io::AsyncRead` as a `&[u8]` without reading the entire file into |
| /// memory. |
| /// |
| /// This is defined as a macro to work around the lack of Higher Ranked Types. See the |
| /// example for how to pass a parser to the macro (constructing parts of the parser outside of |
| /// the `decode!` call is unlikely to work. |
| /// |
| /// ``` |
| /// # use tokio_dep as tokio; |
| /// # use futures_03_dep as futures; |
| /// use futures::pin_mut; |
| /// use tokio::{ |
| /// fs::File, |
| /// }; |
| /// |
| /// use combine::{decode_tokio, satisfy, skip_many1, many1, sep_end_by, Parser, stream::{Decoder, buf_reader::BufReader}}; |
| /// |
| /// #[tokio::main] |
| /// async fn main() { |
| /// let mut read = BufReader::new(File::open("README.md").await.unwrap()); |
| /// let mut decoder = Decoder::new_bufferless(); |
| /// let is_whitespace = |b: u8| b == b' ' || b == b'\r' || b == b'\n'; |
| /// assert_eq!( |
| /// decode_tokio!( |
| /// decoder, |
| /// read, |
| /// { |
| /// let word = many1(satisfy(|b| !is_whitespace(b))); |
| /// sep_end_by(word, skip_many1(satisfy(is_whitespace))).map(|words: Vec<Vec<u8>>| words.len()) |
| /// }, |
| /// |input, _position| combine::easy::Stream::from(input), |
| /// ).map_err(combine::easy::Errors::<u8, &[u8], _>::from), |
| /// Ok(824), |
| /// ); |
| /// } |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"tokio"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"tokio"</span>)))] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>decode_tokio { |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="macro-nonterminal">$</span><span class="macro">crate::decode_tokio!</span>(<span class="macro-nonterminal">$decoder</span>, <span class="macro-nonterminal">$read</span>, <span class="macro-nonterminal">$parser</span>, |input, _position| input) |
| }; |
| |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr, <span class="macro-nonterminal">$input_stream</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="macro-nonterminal">$</span><span class="macro">crate::decode_tokio!</span>(<span class="macro-nonterminal">$decoder</span>, <span class="macro-nonterminal">$read</span>, <span class="macro-nonterminal">$parser</span>, <span class="macro-nonterminal">$input_stream</span>, |x| x) |
| }; |
| |
| (<span class="macro-nonterminal">$decoder</span>: expr, <span class="macro-nonterminal">$read</span>: expr, <span class="macro-nonterminal">$parser</span>: expr, <span class="macro-nonterminal">$input_stream</span>: expr, <span class="macro-nonterminal">$post_decode</span>: expr $(,)<span class="question-mark">?</span>) => { |
| <span class="kw">match </span><span class="macro-nonterminal">$decoder </span>{ |
| <span class="kw-2">ref mut </span>decoder => <span class="kw">match </span><span class="macro-nonterminal">$read </span>{ |
| <span class="kw-2">ref mut </span>read => <span class="lifetime">'outer</span>: <span class="kw">loop </span>{ |
| <span class="kw">let </span>(opt, removed) = { |
| <span class="kw">let </span>(state, position, buffer, end_of_input) = decoder.__inner(); |
| <span class="kw">let </span>buffer = |
| <span class="macro-nonterminal">$crate::stream::buf_reader::CombineBuffer::buffer</span>(buffer, <span class="kw-2">&*</span>read); |
| <span class="kw">let </span><span class="kw-2">mut </span>stream = <span class="macro-nonterminal">$crate::stream::call_with2</span>( |
| <span class="macro-nonterminal">$crate::stream::MaybePartialStream</span>(buffer, !end_of_input), |
| <span class="kw-2">*</span>position, |
| <span class="macro-nonterminal">$input_stream</span>, |
| ); |
| <span class="kw">let </span>result = <span class="macro-nonterminal">$crate::stream::decode</span>(<span class="macro-nonterminal">$parser</span>, <span class="kw-2">&mut </span>stream, state); |
| <span class="kw-2">*</span>position = <span class="macro-nonterminal">$crate::stream::Positioned::position</span>(<span class="kw-2">&</span>stream); |
| <span class="macro-nonterminal">$crate::stream::call_with</span>(stream, <span class="macro-nonterminal">$post_decode</span>); |
| <span class="kw">match </span>result { |
| <span class="prelude-val">Ok</span>(x) => x, |
| <span class="prelude-val">Err</span>(err) => { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Err</span>(<span class="macro-nonterminal">$crate::stream::decoder::Error::Parse</span>(err)) |
| } |
| } |
| }; |
| |
| decoder.advance_pin(std::pin::Pin::new(read), removed); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = opt { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Ok</span>(v); |
| } |
| |
| <span class="kw">match </span>decoder |
| .__before_parse_tokio(std::pin::Pin::new(<span class="kw-2">&mut *</span>read)) |
| .<span class="kw">await |
| </span>{ |
| <span class="prelude-val">Ok</span>(x) => x, |
| <span class="prelude-val">Err</span>(error) => { |
| <span class="kw">break </span><span class="lifetime">'outer </span><span class="prelude-val">Err</span>(<span class="macro-nonterminal">$crate::stream::decoder::Error::Io </span>{ |
| error, |
| position: Clone::clone(decoder.position()), |
| }) |
| } |
| }; |
| }, |
| }, |
| } |
| }; |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub fn </span>call_with2<F, A, B, R>(a: A, b: B, f: F) -> R |
| <span class="kw">where |
| </span>F: FnOnce(A, B) -> R, |
| { |
| f(a, b) |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub fn </span>call_with<F, A, R>(a: A, f: F) -> R |
| <span class="kw">where |
| </span>F: FnOnce(A) -> R, |
| { |
| f(a) |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[test] |
| #[inline] |
| </span><span class="kw">fn </span>uncons_range_at_end() { |
| <span class="macro">assert_eq!</span>(<span class="string">""</span>.uncons_range(<span class="number">0</span>), <span class="prelude-val">Ok</span>(<span class="string">""</span>)); |
| <span class="macro">assert_eq!</span>(<span class="string">"123"</span>.uncons_range(<span class="number">3</span>), <span class="prelude-val">Ok</span>(<span class="string">"123"</span>)); |
| <span class="macro">assert_eq!</span>((<span class="kw-2">&</span>[<span class="number">1</span>][..]).uncons_range(<span class="number">1</span>), <span class="prelude-val">Ok</span>(<span class="kw-2">&</span>[<span class="number">1</span>][..])); |
| <span class="kw">let </span>s: <span class="kw-2">&</span>[u8] = <span class="kw-2">&</span>[]; |
| <span class="macro">assert_eq!</span>(SliceStream(s).uncons_range(<span class="number">0</span>), <span class="prelude-val">Ok</span>(<span class="kw-2">&</span>[][..])); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>larger_than_1_byte_items_return_correct_distance() { |
| <span class="kw">let </span><span class="kw-2">mut </span>input = <span class="kw-2">&</span>[<span class="number">123i32</span>, <span class="number">0i32</span>][..]; |
| |
| <span class="kw">let </span>before = input.checkpoint(); |
| <span class="macro">assert_eq!</span>(input.distance(<span class="kw-2">&</span>before), <span class="number">0</span>); |
| |
| input.uncons().unwrap(); |
| <span class="macro">assert_eq!</span>(input.distance(<span class="kw-2">&</span>before), <span class="number">1</span>); |
| |
| input.uncons().unwrap(); |
| <span class="macro">assert_eq!</span>(input.distance(<span class="kw-2">&</span>before), <span class="number">2</span>); |
| |
| input.reset(before).unwrap(); |
| <span class="macro">assert_eq!</span>(input.distance(<span class="kw-2">&</span>before), <span class="number">0</span>); |
| } |
| } |
| </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> |