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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/combine-4.6.6/src/parser/range.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>range.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../combine/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../combine/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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</pre><pre class="rust"><code><span class="doccomment">//! Module containing zero-copy parsers.
//!
//! These parsers require the [`RangeStream`][] bound instead of a plain [`Stream`][].
//!
//! [`RangeStream`]: ../../stream/trait.RangeStream.html
//! [`Stream`]: ../../stream/trait.Stream.html
</span><span class="kw">use crate</span>::{
error::{
<span class="self">self</span>, ParseError,
ParseResult::{<span class="self">self</span>, <span class="kw-2">*</span>},
ResultExt, StreamError, Tracked,
},
lib::{convert::TryFrom, marker::PhantomData},
parser::ParseMode,
};
<span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="kw">use </span><span class="kw">crate</span>::lib::error::Error <span class="kw">as </span>StdError;
<span class="attribute">#[cfg(not(feature = <span class="string">&quot;std&quot;</span>))]
</span><span class="kw">use </span><span class="kw">crate</span>::lib::fmt;
<span class="kw">use </span><span class="kw">crate</span>::stream::{
uncons_range, uncons_while, uncons_while1, wrap_stream_error, Range <span class="kw">as </span>StreamRange,
RangeStream, StreamErrorFor, StreamOnce,
};
<span class="kw">use </span><span class="kw">crate</span>::Parser;
<span class="kw">pub struct </span>Range&lt;Input&gt;(Input::Range)
<span class="kw">where
</span>Input: RangeStream;
<span class="kw">impl</span>&lt;Input&gt; Parser&lt;Input&gt; <span class="kw">for </span>Range&lt;Input&gt;
<span class="kw">where
</span>Input: RangeStream,
Input::Range: PartialEq + <span class="kw">crate</span>::stream::Range,
{
<span class="kw">type </span>Output = Input::Range;
<span class="kw">type </span>PartialState = ();
<span class="attribute">#[inline]
</span><span class="kw">fn </span>parse_lazy(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
input: <span class="kw-2">&amp;mut </span>Input,
) -&gt; ParseResult&lt;<span class="self">Self</span>::Output, &lt;Input <span class="kw">as </span>StreamOnce&gt;::Error&gt; {
<span class="kw">use </span><span class="kw">crate</span>::stream::Range;
<span class="kw">let </span>position = input.position();
<span class="kw">match </span>input.uncons_range(<span class="self">self</span>.<span class="number">0</span>.len()) {
<span class="prelude-val">Ok</span>(other) =&gt; {
<span class="kw">if </span>other == <span class="self">self</span>.<span class="number">0 </span>{
CommitOk(other)
} <span class="kw">else </span>{
PeekErr(Input::Error::empty(position).into())
}
}
<span class="prelude-val">Err</span>(err) =&gt; wrap_stream_error(input, err),
}
}
<span class="kw">fn </span>add_error(<span class="kw-2">&amp;mut </span><span class="self">self</span>, errors: <span class="kw-2">&amp;mut </span>Tracked&lt;&lt;Input <span class="kw">as </span>StreamOnce&gt;::Error&gt;) {
<span class="comment">// TODO Add unexpected message?
</span>errors.error.add_expected(error::Range(<span class="self">self</span>.<span class="number">0</span>.clone()));
}
}
<span class="macro">parser! </span>{
<span class="attribute">#[derive(Clone)]
</span><span class="kw">pub struct </span>Recognize;
<span class="kw">type </span>PartialState = &lt;RecognizeWithValue&lt;P&gt; <span class="kw">as </span>Parser&lt;Input&gt;&gt;::PartialState;
<span class="doccomment">/// Zero-copy parser which returns committed input range.
///
/// [`combinator::recognize`][] is a non-`RangeStream` alternative.
///
/// [`combinator::recognize`]: ../../parser/combinator/fn.recognize.html
/// ```
/// # extern crate combine;
/// # use combine::parser::range::recognize;
/// # use combine::parser::char::letter;
/// # use combine::*;
/// # fn main() {
/// let mut parser = recognize(skip_many1(letter()));
/// assert_eq!(parser.parse(&quot;hello world&quot;), Ok((&quot;hello&quot;, &quot; world&quot;)));
/// assert!(parser.parse(&quot;!&quot;).is_err());
/// # }
/// ```
</span><span class="kw">pub fn </span>recognize[Input, P](parser: P)(Input) -&gt; &lt;Input <span class="kw">as </span>StreamOnce&gt;::Range
<span class="kw">where </span>[
P: Parser&lt;Input&gt;,
Input: RangeStream,
&lt;Input <span class="kw">as </span>StreamOnce&gt;::Range: <span class="kw">crate</span>::stream::Range,
]
{
recognize_with_value(parser).map(|(range, <span class="kw">_</span>)| range)
}
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>parse_partial_range&lt;M, F, G, S, Input&gt;(
mode: M,
input: <span class="kw-2">&amp;mut </span>Input,
distance_state: <span class="kw-2">&amp;mut </span>usize,
state: S,
first: F,
resume: G,
) -&gt; ParseResult&lt;Input::Range, Input::Error&gt;
<span class="kw">where
</span>M: ParseMode,
F: FnOnce(<span class="kw-2">&amp;mut </span>Input, S) -&gt; ParseResult&lt;Input::Range, &lt;Input <span class="kw">as </span>StreamOnce&gt;::Error&gt;,
G: FnOnce(<span class="kw-2">&amp;mut </span>Input, S) -&gt; ParseResult&lt;Input::Range, &lt;Input <span class="kw">as </span>StreamOnce&gt;::Error&gt;,
Input: RangeStream,
{
<span class="kw">let </span>before = input.checkpoint();
<span class="kw">if </span>!input.is_partial() {
first(input, state)
} <span class="kw">else if </span>mode.is_first() || <span class="kw-2">*</span>distance_state == <span class="number">0 </span>{
<span class="kw">let </span>result = first(input, state);
<span class="kw">if let </span>CommitErr(<span class="kw">_</span>) = result {
<span class="kw-2">*</span>distance_state = input.distance(<span class="kw-2">&amp;</span>before);
<span class="macro">ctry!</span>(input.reset(before).committed());
}
result
} <span class="kw">else </span>{
<span class="kw">if </span>input.uncons_range(<span class="kw-2">*</span>distance_state).is_err() {
<span class="macro">panic!</span>(<span class="string">&quot;recognize errored when restoring the input stream to its expected state&quot;</span>);
}
<span class="kw">match </span>resume(input, state) {
CommitOk(<span class="kw">_</span>) | PeekOk(<span class="kw">_</span>) =&gt; (),
PeekErr(err) =&gt; <span class="kw">return </span>PeekErr(err),
CommitErr(err) =&gt; {
<span class="kw-2">*</span>distance_state = input.distance(<span class="kw-2">&amp;</span>before);
<span class="macro">ctry!</span>(input.reset(before).committed());
<span class="kw">return </span>CommitErr(err);
}
}
<span class="kw">let </span>distance = input.distance(<span class="kw-2">&amp;</span>before);
<span class="macro">ctry!</span>(input.reset(before).committed());
take(distance).parse_lazy(input).map(|range| {
<span class="kw-2">*</span>distance_state = <span class="number">0</span>;
range
})
}
}
<span class="attribute">#[derive(Clone)]
</span><span class="kw">pub struct </span>RecognizeWithValue&lt;P&gt;(P);
<span class="kw">impl</span>&lt;Input, P&gt; Parser&lt;Input&gt; <span class="kw">for </span>RecognizeWithValue&lt;P&gt;
<span class="kw">where
</span>P: Parser&lt;Input&gt;,
Input: RangeStream,
&lt;Input <span class="kw">as </span>StreamOnce&gt;::Range: <span class="kw">crate</span>::stream::Range,
{
<span class="kw">type </span>Output = (&lt;Input <span class="kw">as </span>StreamOnce&gt;::Range, P::Output);
<span class="kw">type </span>PartialState = (usize, P::PartialState);
<span class="macro">parse_mode!</span>(Input);
<span class="attribute">#[inline]
</span><span class="kw">fn </span>parse_mode&lt;M&gt;(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
mode: M,
input: <span class="kw-2">&amp;mut </span>Input,
state: <span class="kw-2">&amp;mut </span><span class="self">Self</span>::PartialState,
) -&gt; ParseResult&lt;<span class="self">Self</span>::Output, &lt;Input <span class="kw">as </span>StreamOnce&gt;::Error&gt;
<span class="kw">where
</span>M: ParseMode,
{
<span class="kw">let </span>(<span class="kw-2">ref mut </span>distance_state, <span class="kw-2">ref mut </span>child_state) = <span class="kw-2">*</span>state;
<span class="kw">let </span>before = input.checkpoint();
<span class="kw">if </span>!mode.is_first() &amp;&amp; input.uncons_range(<span class="kw-2">*</span>distance_state).is_err() {
<span class="macro">panic!</span>(<span class="string">&quot;recognize errored when restoring the input stream to its expected state&quot;</span>);
}
<span class="kw">let </span>value = <span class="kw">match </span><span class="self">self</span>.<span class="number">0</span>.parse_mode(mode, input, child_state) {
CommitOk(x) | PeekOk(x) =&gt; x,
PeekErr(err) =&gt; <span class="kw">return </span>PeekErr(err),
CommitErr(err) =&gt; {
<span class="kw-2">*</span>distance_state = input.distance(<span class="kw-2">&amp;</span>before);
<span class="macro">ctry!</span>(input.reset(before).committed());
<span class="kw">return </span>CommitErr(err);
}
};
<span class="kw">let </span>distance = input.distance(<span class="kw-2">&amp;</span>before);
<span class="macro">ctry!</span>(input.reset(before).committed());
take(distance).parse_lazy(input).map(|range| {
<span class="kw-2">*</span>distance_state = <span class="number">0</span>;
(range, value)
})
}
<span class="kw">fn </span>add_error(<span class="kw-2">&amp;mut </span><span class="self">self</span>, errors: <span class="kw-2">&amp;mut </span>Tracked&lt;&lt;Input <span class="kw">as </span>StreamOnce&gt;::Error&gt;) {
<span class="self">self</span>.<span class="number">0</span>.add_error(errors)
}
}
<span class="doccomment">/// Zero-copy parser which returns a pair: (committed input range, parsed value).
///
///
/// [`combinator::recognize_with_value`] is a non-`RangeStream` alternative.
///
/// [`combinator::recognize_with_value`]: recognize_with_value
/// ```
/// # extern crate combine;
/// # use combine::parser::range::recognize_with_value;
/// # use combine::parser::char::{digit, char};
/// # use combine::*;
/// # fn main() {
/// let mut parser = recognize_with_value((
/// skip_many1(digit()),
/// optional((attempt(char(&#39;.&#39;)), skip_many1(digit()))),
/// ).map(|(_, opt)| opt.is_some()));
///
/// assert_eq!(parser.parse(&quot;1234!&quot;), Ok(((&quot;1234&quot;, false), &quot;!&quot;)));
/// assert_eq!(parser.parse(&quot;1234.0001!&quot;), Ok(((&quot;1234.0001&quot;, true), &quot;!&quot;)));
/// assert!(parser.parse(&quot;!&quot;).is_err());
/// assert!(parser.parse(&quot;1234.&quot;).is_err());
/// # }
/// ```
</span><span class="kw">pub fn </span>recognize_with_value&lt;Input, P&gt;(parser: P) -&gt; RecognizeWithValue&lt;P&gt;
<span class="kw">where
</span>P: Parser&lt;Input&gt;,
Input: RangeStream,
&lt;Input <span class="kw">as </span>StreamOnce&gt;::Range: <span class="kw">crate</span>::stream::Range,
{
RecognizeWithValue(parser)
}
<span class="doccomment">/// Zero-copy parser which reads a range of length `i.len()` and succeeds if `i` is equal to that
/// range.
///
/// [`tokens`] is a non-`RangeStream` alternative.
///
/// [`tokens`]: super::token::tokens
/// ```
/// # extern crate combine;
/// # use combine::parser::range::range;
/// # use combine::*;
/// # fn main() {
/// let mut parser = range(&quot;hello&quot;);
/// let result = parser.parse(&quot;hello world&quot;);
/// assert_eq!(result, Ok((&quot;hello&quot;, &quot; world&quot;)));
/// let result = parser.parse(&quot;hel world&quot;);
/// assert!(result.is_err());
/// # }
/// ```
</span><span class="kw">pub fn </span>range&lt;Input&gt;(i: Input::Range) -&gt; Range&lt;Input&gt;
<span class="kw">where
</span>Input: RangeStream,
Input::Range: PartialEq,
{
Range(i)
}
<span class="kw">pub struct </span>Take&lt;Input&gt;(usize, PhantomData&lt;<span class="kw">fn</span>(Input)&gt;);
<span class="kw">impl</span>&lt;Input&gt; Parser&lt;Input&gt; <span class="kw">for </span>Take&lt;Input&gt;
<span class="kw">where
</span>Input: RangeStream,
{
<span class="kw">type </span>Output = Input::Range;
<span class="kw">type </span>PartialState = ();
<span class="attribute">#[inline]
</span><span class="kw">fn </span>parse_lazy(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
input: <span class="kw-2">&amp;mut </span>Input,
) -&gt; ParseResult&lt;<span class="self">Self</span>::Output, &lt;Input <span class="kw">as </span>StreamOnce&gt;::Error&gt; {
uncons_range(input, <span class="self">self</span>.<span class="number">0</span>)
}
}
<span class="doccomment">/// Zero-copy parser which reads a range of length `n`.
///
/// [`count_min_max`][] is a non-`RangeStream` alternative.
///
/// [`count_min_max`]: ../../parser/repeat/fn.count_min_max.html
/// ```
/// # extern crate combine;
/// # use combine::parser::range::take;
/// # use combine::*;
/// # fn main() {
/// let mut parser = take(1);
/// let result = parser.parse(&quot;1&quot;);
/// assert_eq!(result, Ok((&quot;1&quot;, &quot;&quot;)));
/// let mut parser = take(4);
/// let result = parser.parse(&quot;123abc&quot;);
/// assert_eq!(result, Ok((&quot;123a&quot;, &quot;bc&quot;)));
/// let result = parser.parse(&quot;abc&quot;);
/// assert!(result.is_err());
/// # }
/// ```
</span><span class="kw">pub fn </span>take&lt;Input&gt;(n: usize) -&gt; Take&lt;Input&gt;
<span class="kw">where
</span>Input: RangeStream,
{
Take(n, PhantomData)
}
<span class="kw">pub struct </span>TakeWhile&lt;Input, F&gt;(F, PhantomData&lt;<span class="kw">fn</span>(Input) -&gt; Input&gt;);
<span class="kw">impl</span>&lt;Input, F&gt; Parser&lt;Input&gt; <span class="kw">for </span>TakeWhile&lt;Input, F&gt;
<span class="kw">where
</span>Input: RangeStream,
Input::Range: <span class="kw">crate</span>::stream::Range,
F: FnMut(Input::Token) -&gt; bool,
{
<span class="kw">type </span>Output = Input::Range;
<span class="kw">type </span>PartialState = usize;
<span class="macro">parse_mode!</span>(Input);
<span class="attribute">#[inline]
</span><span class="kw">fn </span>parse_mode_impl&lt;M&gt;(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
mode: M,
input: <span class="kw-2">&amp;mut </span>Input,
state: <span class="kw-2">&amp;mut </span><span class="self">Self</span>::PartialState,
) -&gt; ParseResult&lt;<span class="self">Self</span>::Output, &lt;Input <span class="kw">as </span>StreamOnce&gt;::Error&gt;
<span class="kw">where
</span>M: ParseMode,
{
parse_partial_range(
mode,
input,
state,
<span class="kw-2">&amp;mut </span><span class="self">self</span>.<span class="number">0</span>,
|input, predicate| uncons_while(input, predicate),
|input, predicate| uncons_while(input, predicate),
)
}
}
<span class="doccomment">/// Zero-copy parser which reads a range of 0 or more tokens which satisfy `f`.
///
/// [`many`][] is a non-`RangeStream` alternative.
///
/// [`many`]: ../../parser/repeat/fn.many.html
/// ```
/// # extern crate combine;
/// # use combine::parser::range::take_while;
/// # use combine::*;
/// # fn main() {
/// let mut parser = take_while(|c: char| c.is_digit(10));
/// let result = parser.parse(&quot;123abc&quot;);
/// assert_eq!(result, Ok((&quot;123&quot;, &quot;abc&quot;)));
/// let result = parser.parse(&quot;abc&quot;);
/// assert_eq!(result, Ok((&quot;&quot;, &quot;abc&quot;)));
/// # }
/// ```
</span><span class="kw">pub fn </span>take_while&lt;Input, F&gt;(f: F) -&gt; TakeWhile&lt;Input, F&gt;
<span class="kw">where
</span>Input: RangeStream,
Input::Range: <span class="kw">crate</span>::stream::Range,
F: FnMut(Input::Token) -&gt; bool,
{
TakeWhile(f, PhantomData)
}
<span class="kw">pub struct </span>TakeWhile1&lt;Input, F&gt;(F, PhantomData&lt;<span class="kw">fn</span>(Input) -&gt; Input&gt;);
<span class="kw">impl</span>&lt;Input, F&gt; Parser&lt;Input&gt; <span class="kw">for </span>TakeWhile1&lt;Input, F&gt;
<span class="kw">where
</span>Input: RangeStream,
Input::Range: <span class="kw">crate</span>::stream::Range,
F: FnMut(Input::Token) -&gt; bool,
{
<span class="kw">type </span>Output = Input::Range;
<span class="kw">type </span>PartialState = usize;
<span class="macro">parse_mode!</span>(Input);
<span class="attribute">#[inline]
</span><span class="kw">fn </span>parse_mode_impl&lt;M&gt;(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
mode: M,
input: <span class="kw-2">&amp;mut </span>Input,
state: <span class="kw-2">&amp;mut </span><span class="self">Self</span>::PartialState,
) -&gt; ParseResult&lt;<span class="self">Self</span>::Output, &lt;Input <span class="kw">as </span>StreamOnce&gt;::Error&gt;
<span class="kw">where
</span>M: ParseMode,
{
parse_partial_range(
mode,
input,
state,
<span class="kw-2">&amp;mut </span><span class="self">self</span>.<span class="number">0</span>,
|input, predicate| uncons_while1(input, predicate),
|input, predicate| uncons_while(input, predicate),
)
}
}
<span class="doccomment">/// Zero-copy parser which reads a range of 1 or more tokens which satisfy `f`.
///
/// [`many1`][] is a non-`RangeStream` alternative.
///
/// [`many1`]: ../../parser/repeat/fn.many1.html
/// ```
/// # extern crate combine;
/// # use combine::parser::range::take_while1;
/// # use combine::*;
/// # fn main() {
/// let mut parser = take_while1(|c: char| c.is_digit(10));
/// let result = parser.parse(&quot;123abc&quot;);
/// assert_eq!(result, Ok((&quot;123&quot;, &quot;abc&quot;)));
/// let result = parser.parse(&quot;abc&quot;);
/// assert!(result.is_err());
/// # }
/// ```
</span><span class="kw">pub fn </span>take_while1&lt;Input, F&gt;(f: F) -&gt; TakeWhile1&lt;Input, F&gt;
<span class="kw">where
</span>Input: RangeStream,
Input::Range: <span class="kw">crate</span>::stream::Range,
F: FnMut(Input::Token) -&gt; bool,
{
TakeWhile1(f, PhantomData)
}
<span class="kw">pub struct </span>TakeUntilRange&lt;Input&gt;(Input::Range)
<span class="kw">where
</span>Input: RangeStream;
<span class="kw">impl</span>&lt;Input&gt; Parser&lt;Input&gt; <span class="kw">for </span>TakeUntilRange&lt;Input&gt;
<span class="kw">where
</span>Input: RangeStream,
Input::Range: PartialEq + <span class="kw">crate</span>::stream::Range,
{
<span class="kw">type </span>Output = Input::Range;
<span class="kw">type </span>PartialState = usize;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>parse_partial(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
input: <span class="kw-2">&amp;mut </span>Input,
to_consume: <span class="kw-2">&amp;mut </span><span class="self">Self</span>::PartialState,
) -&gt; ParseResult&lt;<span class="self">Self</span>::Output, &lt;Input <span class="kw">as </span>StreamOnce&gt;::Error&gt; {
<span class="kw">use </span><span class="kw">crate</span>::stream::Range;
<span class="kw">let </span>len = <span class="self">self</span>.<span class="number">0</span>.len();
<span class="kw">let </span>before = input.checkpoint();
<span class="kw">let </span><span class="kw-2">mut </span>first_stream_error = <span class="prelude-val">None</span>;
<span class="comment">// Skip until the end of the last parse attempt
</span><span class="macro">ctry!</span>(uncons_range(input, <span class="kw-2">*</span>to_consume));
<span class="kw">loop </span>{
<span class="kw">let </span>look_ahead_input = input.checkpoint();
<span class="kw">match </span>input.uncons_range(len) {
<span class="prelude-val">Ok</span>(xs) =&gt; {
<span class="kw">if </span>xs == <span class="self">self</span>.<span class="number">0 </span>{
<span class="kw">let </span>distance = input.distance(<span class="kw-2">&amp;</span>before) - len;
<span class="macro">ctry!</span>(input.reset(before).committed());
<span class="kw">if let </span><span class="prelude-val">Ok</span>(committed) = input.uncons_range(distance) {
<span class="kw">if </span>distance == <span class="number">0 </span>{
<span class="kw">return </span>PeekOk(committed);
} <span class="kw">else </span>{
<span class="kw-2">*</span>to_consume = <span class="number">0</span>;
<span class="kw">return </span>CommitOk(committed);
}
}
<span class="comment">// We are guaranteed able to uncons to_consume characters here
// because we&#39;ve already done it on look_ahead_input.
</span><span class="macro">unreachable!</span>();
} <span class="kw">else </span>{
<span class="comment">// Reset the stream back to where it was when we entered the top of the loop
</span><span class="macro">ctry!</span>(input.reset(look_ahead_input).committed());
<span class="comment">// Advance the stream by one token
</span><span class="kw">if </span>input.uncons().is_err() {
<span class="macro">unreachable!</span>();
}
}
}
<span class="prelude-val">Err</span>(first_error) =&gt; {
<span class="comment">// If we are unable to find a successful parse even after advancing with `uncons`
// below we must reset the stream to its state before the first error.
// If we don&#39;t we may try and match the range `::` against `:&lt;EOF&gt;` which would
// fail as only one `:` is present at this parse attempt. But when we later resume
// with more input we must start parsing again at the first time we errored so we
// can see the entire `::`
</span><span class="kw">if </span>first_stream_error.is_none() {
first_stream_error = <span class="prelude-val">Some</span>((first_error, input.distance(<span class="kw-2">&amp;</span>before)));
}
<span class="comment">// Reset the stream back to where it was when we entered the top of the loop
</span><span class="macro">ctry!</span>(input.reset(look_ahead_input).committed());
<span class="comment">// See if we can advance anyway
</span><span class="kw">if </span>input.uncons().is_err() {
<span class="kw">let </span>(first_error, first_error_distance) = first_stream_error.unwrap();
<span class="comment">// Reset the stream
</span><span class="macro">ctry!</span>(input.reset(before).committed());
<span class="kw-2">*</span>to_consume = first_error_distance;
<span class="comment">// Return the original error if uncons failed
</span><span class="kw">return </span>wrap_stream_error(input, first_error);
}
}
};
}
}
}
<span class="doccomment">/// Zero-copy parser which reads a range of 0 or more tokens until `r` is found.
///
/// The range `r` will not be committed. If `r` is not found, the parser will
/// return an error.
///
/// [`repeat::take_until`][] is a non-`RangeStream` alternative.
///
/// [`repeat::take_until`]: ../../parser/repeat/fn.take_until.html
/// ```
/// # extern crate combine;
/// # use combine::parser::range::{range, take_until_range};
/// # use combine::*;
/// # fn main() {
/// let mut parser = take_until_range(&quot;\r\n&quot;);
/// let result = parser.parse(&quot;To: user@example.com\r\n&quot;);
/// assert_eq!(result, Ok((&quot;To: user@example.com&quot;, &quot;\r\n&quot;)));
/// let result = parser.parse(&quot;Hello, world\n&quot;);
/// assert!(result.is_err());
/// # }
/// ```
</span><span class="kw">pub fn </span>take_until_range&lt;Input&gt;(r: Input::Range) -&gt; TakeUntilRange&lt;Input&gt;
<span class="kw">where
</span>Input: RangeStream,
{
TakeUntilRange(r)
}
<span class="attribute">#[derive(Debug, PartialEq)]
</span><span class="kw">pub enum </span>TakeRange {
<span class="doccomment">/// Found the pattern at this offset
</span>Found(usize),
<span class="doccomment">/// Did not find the pattern but the parser can skip ahead to this offset.
</span>NotFound(usize),
}
<span class="kw">impl </span>From&lt;<span class="prelude-ty">Option</span>&lt;usize&gt;&gt; <span class="kw">for </span>TakeRange {
<span class="kw">fn </span>from(opt: <span class="prelude-ty">Option</span>&lt;usize&gt;) -&gt; TakeRange {
<span class="kw">match </span>opt {
<span class="prelude-val">Some</span>(i) =&gt; TakeRange::Found(i),
<span class="prelude-val">None </span>=&gt; TakeRange::NotFound(<span class="number">0</span>),
}
}
}
<span class="kw">pub struct </span>TakeFn&lt;F, Input&gt; {
searcher: F,
_marker: PhantomData&lt;<span class="kw">fn</span>(Input)&gt;,
}
<span class="kw">impl</span>&lt;Input, F, R&gt; Parser&lt;Input&gt; <span class="kw">for </span>TakeFn&lt;F, Input&gt;
<span class="kw">where
</span>F: FnMut(Input::Range) -&gt; R,
R: Into&lt;TakeRange&gt;,
Input: RangeStream,
Input::Range: <span class="kw">crate</span>::stream::Range,
{
<span class="kw">type </span>Output = Input::Range;
<span class="kw">type </span>PartialState = usize;
<span class="macro">parse_mode!</span>(Input);
<span class="attribute">#[inline]
</span><span class="kw">fn </span>parse_mode&lt;M&gt;(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
mode: M,
input: <span class="kw-2">&amp;mut </span>Input,
offset: <span class="kw-2">&amp;mut </span><span class="self">Self</span>::PartialState,
) -&gt; ParseResult&lt;<span class="self">Self</span>::Output, &lt;Input <span class="kw">as </span>StreamOnce&gt;::Error&gt;
<span class="kw">where
</span>M: ParseMode,
{
<span class="kw">let </span>checkpoint = input.checkpoint();
<span class="kw">if </span>mode.is_first() {
<span class="kw-2">*</span>offset = <span class="number">0</span>;
} <span class="kw">else </span>{
<span class="kw">let _ </span>= input.uncons_range(<span class="kw-2">*</span>offset);
}
<span class="kw">match </span>(<span class="self">self</span>.searcher)(input.range()).into() {
TakeRange::Found(i) =&gt; {
<span class="macro">ctry!</span>(input.reset(checkpoint).committed());
<span class="kw">let </span>result = uncons_range(input, <span class="kw-2">*</span>offset + i);
<span class="kw">if </span>result.is_ok() {
<span class="kw-2">*</span>offset = <span class="number">0</span>;
}
result
}
TakeRange::NotFound(next_offset) =&gt; {
<span class="kw-2">*</span>offset = next_offset;
<span class="kw">let </span>range = input.range();
<span class="kw">let _ </span>= input.uncons_range(range.len());
<span class="kw">let </span>position = input.position();
<span class="macro">ctry!</span>(input.reset(checkpoint).committed());
<span class="kw">let </span>err = Input::Error::from_error(position, StreamError::end_of_input());
<span class="kw">if </span>!input.is_partial() &amp;&amp; range.is_empty() {
PeekErr(err.into())
} <span class="kw">else </span>{
CommitErr(err)
}
}
}
}
}
<span class="doccomment">/// Searches the entire range using `searcher` and then consumes a range of `Some(n)`.
/// If `f` can not find anything in the range it must return `None/NotFound` which indicates an end of input error.
///
/// If partial parsing is used the `TakeRange` enum can be returned instead of `Option`. By
/// returning `TakeRange::NotFound(n)` it indicates that the input can skip ahead until `n`
/// when parsing is next resumed.
///
/// See [`take_until_bytes`](../byte/fn.take_until_bytes.html) for a usecase.
</span><span class="kw">pub fn </span>take_fn&lt;F, R, Input&gt;(searcher: F) -&gt; TakeFn&lt;F, Input&gt;
<span class="kw">where
</span>F: FnMut(Input::Range) -&gt; R,
R: Into&lt;TakeRange&gt;,
Input: RangeStream,
Input::Range: <span class="kw">crate</span>::stream::Range,
{
TakeFn {
searcher,
_marker: PhantomData,
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="macro">parser! </span>{
<span class="doccomment">/// Takes a parser which parses a `length` then extracts a range of that length and returns it.
/// Commonly used in binary formats
///
/// ```
/// # use combine::parser::{byte::num::be_u16, range::length_prefix};
/// # use combine::*;
/// # fn main() {
/// let mut input = Vec::new();
/// input.extend_from_slice(&amp;3u16.to_be_bytes());
/// input.extend_from_slice(b&quot;1234&quot;);
///
/// let mut parser = length_prefix(be_u16());
/// let result = parser.parse(&amp;input[..]);
/// assert_eq!(result, Ok((&amp;b&quot;123&quot;[..], &amp;b&quot;4&quot;[..])));
/// # }
/// ```
</span><span class="kw">pub fn </span>length_prefix[Input, P](len: P)(Input) -&gt; Input::Range
<span class="kw">where </span>[
Input: RangeStream,
P: Parser&lt;Input&gt;,
usize: TryFrom&lt;P::Output&gt;,
&lt;usize <span class="kw">as </span>TryFrom&lt;P::Output&gt;&gt;::Error: StdError + Send + Sync + <span class="lifetime">&#39;static</span>,
]
{
len
.and_then(|u| {
usize::try_from(u)
.map_err(StreamErrorFor::&lt;Input&gt;::other)
})
.then_partial(|<span class="kw-2">&amp;mut </span>len| take(len))
}
}
<span class="attribute">#[cfg(not(feature = <span class="string">&quot;std&quot;</span>))]
</span><span class="macro">parser! </span>{
<span class="doccomment">/// Takes a parser which parses a `length` then extracts a range of that length and returns it.
/// Commonly used in binary formats
///
/// ```
/// # use combine::parser::{byte::num::be_u16, range::length_prefix};
/// # use combine::*;
/// # fn main() {
/// let mut input = Vec::new();
/// input.extend_from_slice(&amp;3u16.to_be_bytes());
/// input.extend_from_slice(b&quot;1234&quot;);
///
/// let mut parser = length_prefix(be_u16());
/// let result = parser.parse(&amp;input[..]);
/// assert_eq!(result, Ok((&amp;b&quot;123&quot;[..], &amp;b&quot;4&quot;[..])));
/// # }
/// ```
</span><span class="kw">pub fn </span>length_prefix[Input, P](len: P)(Input) -&gt; Input::Range
<span class="kw">where </span>[
Input: RangeStream,
P: Parser&lt;Input&gt;,
usize: TryFrom&lt;P::Output&gt;,
&lt;usize <span class="kw">as </span>TryFrom&lt;P::Output&gt;&gt;::Error: fmt::Display + Send + Sync + <span class="lifetime">&#39;static</span>,
]
{
len
.and_then(|u| {
usize::try_from(u)
.map_err(StreamErrorFor::&lt;Input&gt;::message_format)
})
.then_partial(|<span class="kw-2">&amp;mut </span>len| take(len))
}
}
<span class="attribute">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use </span><span class="kw">crate</span>::Parser;
<span class="kw">use super</span>::<span class="kw-2">*</span>;
<span class="attribute">#[test]
</span><span class="kw">fn </span>take_while_test() {
<span class="kw">let </span>result = take_while(|c: char| c.is_digit(<span class="number">10</span>)).parse(<span class="string">&quot;123abc&quot;</span>);
<span class="macro">assert_eq!</span>(result, <span class="prelude-val">Ok</span>((<span class="string">&quot;123&quot;</span>, <span class="string">&quot;abc&quot;</span>)));
<span class="kw">let </span>result = take_while(|c: char| c.is_digit(<span class="number">10</span>)).parse(<span class="string">&quot;abc&quot;</span>);
<span class="macro">assert_eq!</span>(result, <span class="prelude-val">Ok</span>((<span class="string">&quot;&quot;</span>, <span class="string">&quot;abc&quot;</span>)));
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>take_while1_test() {
<span class="kw">let </span>result = take_while1(|c: char| c.is_digit(<span class="number">10</span>)).parse(<span class="string">&quot;123abc&quot;</span>);
<span class="macro">assert_eq!</span>(result, <span class="prelude-val">Ok</span>((<span class="string">&quot;123&quot;</span>, <span class="string">&quot;abc&quot;</span>)));
<span class="kw">let </span>result = take_while1(|c: char| c.is_digit(<span class="number">10</span>)).parse(<span class="string">&quot;abc&quot;</span>);
<span class="macro">assert!</span>(result.is_err());
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>range_string_no_char_boundary_error() {
<span class="kw">let </span><span class="kw-2">mut </span>parser = range(<span class="string">&quot;hello&quot;</span>);
<span class="kw">let </span>result = parser.parse(<span class="string">&quot;hell\u{00EE} world&quot;</span>);
<span class="macro">assert!</span>(result.is_err());
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>take_until_range_1() {
<span class="kw">let </span>result = take_until_range(<span class="string">&quot;\&quot;&quot;</span>).parse(<span class="string">&quot;Foo baz bar quux\&quot;&quot;</span>);
<span class="macro">assert_eq!</span>(result, <span class="prelude-val">Ok</span>((<span class="string">&quot;Foo baz bar quux&quot;</span>, <span class="string">&quot;\&quot;&quot;</span>)));
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>take_until_range_2() {
<span class="kw">let </span>result = take_until_range(<span class="string">&quot;===&quot;</span>).parse(<span class="string">&quot;if ((pointless_comparison == 3) === true) {&quot;</span>);
<span class="macro">assert_eq!</span>(
result,
<span class="prelude-val">Ok</span>((<span class="string">&quot;if ((pointless_comparison == 3) &quot;</span>, <span class="string">&quot;=== true) {&quot;</span>))
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>take_until_range_unicode_1() {
<span class="kw">let </span>result = take_until_range(<span class="string">&quot;🦀&quot;</span>)
.parse(<span class="string">&quot;😃 Ferris the friendly rustacean 🦀 and his snake friend 🐍&quot;</span>);
<span class="macro">assert_eq!</span>(
result,
<span class="prelude-val">Ok</span>((
<span class="string">&quot;😃 Ferris the friendly rustacean &quot;</span>,
<span class="string">&quot;🦀 and his snake friend 🐍&quot;
</span>))
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>take_until_range_unicode_2() {
<span class="kw">let </span>result = take_until_range(<span class="string">&quot;⁘⁙/⁘&quot;</span>).parse(<span class="string">&quot;⚙️🛠️🦀=🏎️⁘⁙⁘⁘⁙/⁘⁘⁙/⁘&quot;</span>);
<span class="macro">assert_eq!</span>(result, <span class="prelude-val">Ok</span>((<span class="string">&quot;⚙️🛠️🦀=🏎️⁘⁙⁘&quot;</span>, <span class="string">&quot;⁘⁙/⁘⁘⁙/⁘&quot;</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>