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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/stream/position.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>position.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="kw">use crate</span>::{
error::{ParseError, ParseResult, StreamError},
lib::fmt,
stream::{
IteratorStream, Positioned, RangeStreamOnce, ResetStream, SliceStream, StreamErrorFor,
StreamOnce,
},
};
<span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="kw">use </span><span class="kw">crate</span>::stream::read;
<span class="doccomment">/// Trait for tracking the current position of a `Stream`.
</span><span class="kw">pub trait </span>Positioner&lt;Item&gt; {
<span class="doccomment">/// The type which keeps track of the position
</span><span class="kw">type </span>Position: Clone + Ord;
<span class="kw">type </span>Checkpoint: Clone;
<span class="doccomment">/// Returns the current position
</span><span class="kw">fn </span>position(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Position;
<span class="doccomment">/// Updates the position given that `token` has been taken from the stream
</span><span class="kw">fn </span>update(<span class="kw-2">&amp;mut </span><span class="self">self</span>, token: <span class="kw-2">&amp;</span>Item);
<span class="kw">fn </span>checkpoint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Checkpoint;
<span class="kw">fn </span>reset(<span class="kw-2">&amp;mut </span><span class="self">self</span>, checkpoint: <span class="self">Self</span>::Checkpoint);
}
<span class="doccomment">/// Trait for tracking the current position of a `RangeStream`.
</span><span class="kw">pub trait </span>RangePositioner&lt;Item, Range&gt;: Positioner&lt;Item&gt; {
<span class="doccomment">/// Updates the position given that `range` has been taken from the stream
</span><span class="kw">fn </span>update_range(<span class="kw-2">&amp;mut </span><span class="self">self</span>, range: <span class="kw-2">&amp;</span>Range);
}
<span class="doccomment">/// Defines a default `Positioner` type for a particular `Stream` type.
</span><span class="kw">pub trait </span>DefaultPositioned {
<span class="kw">type </span>Positioner: Default;
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; DefaultPositioned <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str {
<span class="kw">type </span>Positioner = SourcePosition;
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T&gt; DefaultPositioned <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>[T] {
<span class="kw">type </span>Positioner = IndexPositioner;
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T&gt; DefaultPositioned <span class="kw">for </span>SliceStream&lt;<span class="lifetime">&#39;a</span>, T&gt; {
<span class="kw">type </span>Positioner = IndexPositioner;
}
<span class="kw">impl</span>&lt;T&gt; DefaultPositioned <span class="kw">for </span>IteratorStream&lt;T&gt; {
<span class="kw">type </span>Positioner = IndexPositioner;
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="kw">impl</span>&lt;R&gt; DefaultPositioned <span class="kw">for </span>read::Stream&lt;R&gt; {
<span class="kw">type </span>Positioner = IndexPositioner;
}
<span class="doccomment">/// The `Stream&lt;Input&gt;` struct maintains the current position in the stream `Input` using
/// the `Positioner` trait to track the position.
///
/// ```
/// # #![cfg(feature = &quot;std&quot;)]
/// # extern crate combine;
/// # use combine::*;
/// # use combine::stream::easy;
/// # use combine::stream::position;
/// # fn main() {
/// let result = token(b&#39;9&#39;)
/// .message(&quot;Not a nine&quot;)
/// .easy_parse(position::Stream::new(&amp;b&quot;8&quot;[..]));
/// assert_eq!(result, Err(easy::Errors {
/// position: 0,
/// errors: vec![
/// easy::Error::Unexpected(b&#39;8&#39;.into()),
/// easy::Error::Expected(b&#39;9&#39;.into()),
/// easy::Error::Message(&quot;Not a nine&quot;.into())
/// ]
/// }));
/// # }
/// ```
</span><span class="attribute">#[derive(Clone, Debug, PartialEq)]
</span><span class="kw">pub struct </span>Stream&lt;Input, X&gt; {
<span class="doccomment">/// The input stream used when items are requested
</span><span class="kw">pub </span>input: Input,
<span class="doccomment">/// The positioner used to update the current position
</span><span class="kw">pub </span>positioner: X,
}
<span class="kw">impl</span>&lt;Input, X&gt; Stream&lt;Input, X&gt;
<span class="kw">where
</span>Input: StreamOnce,
X: Positioner&lt;Input::Token&gt;,
{
<span class="doccomment">/// Creates a new `Stream&lt;Input, X&gt;` from an input stream and a positioner.
</span><span class="kw">pub fn </span>with_positioner(input: Input, positioner: X) -&gt; Stream&lt;Input, X&gt; {
Stream { input, positioner }
}
}
<span class="kw">impl</span>&lt;Input&gt; Stream&lt;Input, Input::Positioner&gt;
<span class="kw">where
</span>Input: StreamOnce + DefaultPositioned,
Input::Positioner: Positioner&lt;Input::Token&gt;,
{
<span class="doccomment">/// Creates a new `Stream&lt;Input, X&gt;` from an input stream and its default positioner.
</span><span class="kw">pub fn </span>new(input: Input) -&gt; Stream&lt;Input, Input::Positioner&gt; {
Stream::with_positioner(input, Input::Positioner::default())
}
}
<span class="kw">impl</span>&lt;Input, X, E&gt; Positioned <span class="kw">for </span>Stream&lt;Input, X&gt;
<span class="kw">where
</span>Input: StreamOnce,
X: Positioner&lt;Input::Token&gt;,
E: StreamError&lt;Input::Token, Input::Range&gt;,
Input::Error: ParseError&lt;Input::Token, Input::Range, X::Position, StreamError = E&gt;,
Input::Error: ParseError&lt;Input::Token, Input::Range, Input::Position, StreamError = E&gt;,
{
<span class="attribute">#[inline]
</span><span class="kw">fn </span>position(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Position {
<span class="self">self</span>.positioner.position()
}
}
<span class="kw">impl</span>&lt;Input, X, S&gt; StreamOnce <span class="kw">for </span>Stream&lt;Input, X&gt;
<span class="kw">where
</span>Input: StreamOnce,
X: Positioner&lt;Input::Token&gt;,
S: StreamError&lt;Input::Token, Input::Range&gt;,
Input::Error: ParseError&lt;Input::Token, Input::Range, X::Position, StreamError = S&gt;
+ ParseError&lt;Input::Token, Input::Range, Input::Position, StreamError = S&gt;,
{
<span class="kw">type </span>Token = Input::Token;
<span class="kw">type </span>Range = Input::Range;
<span class="kw">type </span>Position = X::Position;
<span class="kw">type </span>Error = Input::Error;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>uncons(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;Input::Token, StreamErrorFor&lt;<span class="self">Self</span>&gt;&gt; {
<span class="self">self</span>.input.uncons().map(|c| {
<span class="self">self</span>.positioner.update(<span class="kw-2">&amp;</span>c);
c
})
}
<span class="kw">fn </span>is_partial(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.input.is_partial()
}
}
<span class="kw">impl</span>&lt;Item, T&gt; Positioner&lt;Item&gt; <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;_ </span><span class="kw-2">mut </span>T
<span class="kw">where
</span>Item: Clone,
T: <span class="question-mark">?</span>Sized + Positioner&lt;Item&gt;,
{
<span class="kw">type </span>Position = T::Position;
<span class="kw">type </span>Checkpoint = T::Checkpoint;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>position(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; T::Position {
(<span class="kw-2">**</span><span class="self">self</span>).position()
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>update(<span class="kw-2">&amp;mut </span><span class="self">self</span>, item: <span class="kw-2">&amp;</span>Item) {
(<span class="kw-2">**</span><span class="self">self</span>).update(item)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>checkpoint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Checkpoint {
(<span class="kw-2">**</span><span class="self">self</span>).checkpoint()
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>reset(<span class="kw-2">&amp;mut </span><span class="self">self</span>, checkpoint: <span class="self">Self</span>::Checkpoint) {
(<span class="kw-2">**</span><span class="self">self</span>).reset(checkpoint)
}
}
<span class="kw">impl</span>&lt;Item, Range, T&gt; RangePositioner&lt;Item, Range&gt; <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;_ </span><span class="kw-2">mut </span>T
<span class="kw">where
</span>Item: Clone,
Range: Clone + <span class="kw">crate</span>::stream::Range,
T: <span class="question-mark">?</span>Sized + RangePositioner&lt;Item, Range&gt;,
{
<span class="kw">fn </span>update_range(<span class="kw-2">&amp;mut </span><span class="self">self</span>, range: <span class="kw-2">&amp;</span>Range) {
(<span class="kw-2">**</span><span class="self">self</span>).update_range(range);
}
}
<span class="doccomment">/// The `IndexPositioner&lt;Item, Range&gt;` struct maintains the current index into the stream `Input`. The
/// initial index is index 0. Each `Item` committed increments the index by 1; each `range` committed
/// increments the position by `range.len()`.
</span><span class="attribute">#[derive(Clone, Debug, Default, PartialEq)]
</span><span class="kw">pub struct </span>IndexPositioner(usize);
<span class="kw">impl</span>&lt;Item&gt; Positioner&lt;Item&gt; <span class="kw">for </span>IndexPositioner
<span class="kw">where
</span>Item: Clone,
{
<span class="kw">type </span>Position = usize;
<span class="kw">type </span>Checkpoint = <span class="self">Self</span>;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>position(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.<span class="number">0
</span>}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>update(<span class="kw-2">&amp;mut </span><span class="self">self</span>, _item: <span class="kw-2">&amp;</span>Item) {
<span class="self">self</span>.<span class="number">0 </span>+= <span class="number">1
</span>}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>checkpoint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Checkpoint {
<span class="self">self</span>.clone()
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>reset(<span class="kw-2">&amp;mut </span><span class="self">self</span>, checkpoint: <span class="self">Self</span>::Checkpoint) {
<span class="kw-2">*</span><span class="self">self </span>= checkpoint;
}
}
<span class="kw">impl </span>IndexPositioner {
<span class="kw">pub fn </span>new() -&gt; IndexPositioner {
IndexPositioner::new_with_position(<span class="number">0</span>)
}
<span class="kw">pub fn </span>new_with_position(position: usize) -&gt; IndexPositioner {
IndexPositioner(position)
}
}
<span class="kw">impl</span>&lt;Item, Range&gt; RangePositioner&lt;Item, Range&gt; <span class="kw">for </span>IndexPositioner
<span class="kw">where
</span>Item: Clone,
Range: Clone + <span class="kw">crate</span>::stream::Range,
{
<span class="kw">fn </span>update_range(<span class="kw-2">&amp;mut </span><span class="self">self</span>, range: <span class="kw-2">&amp;</span>Range) {
<span class="self">self</span>.<span class="number">0 </span>+= range.len()
}
}
<span class="doccomment">/// Struct which represents a position in a source file.
</span><span class="attribute">#[derive(Clone, Copy, Debug, Eq, PartialEq, Ord, PartialOrd)]
</span><span class="kw">pub struct </span>SourcePosition {
<span class="doccomment">/// Current line of the input
</span><span class="kw">pub </span>line: i32,
<span class="doccomment">/// Current column of the input
</span><span class="kw">pub </span>column: i32,
}
<span class="kw">impl </span>Default <span class="kw">for </span>SourcePosition {
<span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
SourcePosition { line: <span class="number">1</span>, column: <span class="number">1 </span>}
}
}
<span class="kw">impl </span>fmt::Display <span class="kw">for </span>SourcePosition {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="macro">write!</span>(f, <span class="string">&quot;line: {}, column: {}&quot;</span>, <span class="self">self</span>.line, <span class="self">self</span>.column)
}
}
<span class="kw">impl </span>SourcePosition {
<span class="kw">pub fn </span>new() -&gt; <span class="self">Self </span>{
SourcePosition::default()
}
}
<span class="kw">impl </span>Positioner&lt;char&gt; <span class="kw">for </span>SourcePosition {
<span class="kw">type </span>Position = SourcePosition;
<span class="kw">type </span>Checkpoint = <span class="self">Self</span>;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>position(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; SourcePosition {
<span class="kw-2">*</span><span class="self">self
</span>}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>update(<span class="kw-2">&amp;mut </span><span class="self">self</span>, token: <span class="kw-2">&amp;</span>char) {
<span class="self">self</span>.column += <span class="number">1</span>;
<span class="kw">if </span><span class="kw-2">*</span>token == <span class="string">&#39;\n&#39; </span>{
<span class="self">self</span>.column = <span class="number">1</span>;
<span class="self">self</span>.line += <span class="number">1</span>;
}
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>checkpoint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Checkpoint {
<span class="kw-2">*</span><span class="self">self
</span>}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>reset(<span class="kw-2">&amp;mut </span><span class="self">self</span>, checkpoint: <span class="self">Self</span>::Checkpoint) {
<span class="kw-2">*</span><span class="self">self </span>= checkpoint;
}
}
<span class="kw">impl </span>Positioner&lt;u8&gt; <span class="kw">for </span>SourcePosition {
<span class="kw">type </span>Position = SourcePosition;
<span class="kw">type </span>Checkpoint = <span class="self">Self</span>;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>position(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; SourcePosition {
<span class="kw-2">*</span><span class="self">self
</span>}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>update(<span class="kw-2">&amp;mut </span><span class="self">self</span>, token: <span class="kw-2">&amp;</span>u8) {
<span class="self">self</span>.column += <span class="number">1</span>;
<span class="kw">if </span><span class="kw-2">*</span>token == <span class="string">b&#39;\n&#39; </span>{
<span class="self">self</span>.column = <span class="number">1</span>;
<span class="self">self</span>.line += <span class="number">1</span>;
}
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>checkpoint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Checkpoint {
<span class="kw-2">*</span><span class="self">self
</span>}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>reset(<span class="kw-2">&amp;mut </span><span class="self">self</span>, checkpoint: <span class="self">Self</span>::Checkpoint) {
<span class="kw-2">*</span><span class="self">self </span>= checkpoint;
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; RangePositioner&lt;char, <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt; <span class="kw">for </span>SourcePosition {
<span class="kw">fn </span>update_range(<span class="kw-2">&amp;mut </span><span class="self">self</span>, range: &amp;&amp;<span class="lifetime">&#39;a </span>str) {
<span class="kw">for </span>c <span class="kw">in </span>range.chars() {
<span class="self">self</span>.update(<span class="kw-2">&amp;</span>c);
}
}
}
<span class="kw">impl</span>&lt;Input, X, S&gt; RangeStreamOnce <span class="kw">for </span>Stream&lt;Input, X&gt;
<span class="kw">where
</span>Input: RangeStreamOnce,
X: RangePositioner&lt;Input::Token, Input::Range&gt;,
S: StreamError&lt;Input::Token, Input::Range&gt;,
Input::Error: ParseError&lt;Input::Token, Input::Range, X::Position, StreamError = S&gt;,
Input::Error: ParseError&lt;Input::Token, Input::Range, Input::Position, StreamError = S&gt;,
Input::Position: Clone + Ord,
{
<span class="attribute">#[inline]
</span><span class="kw">fn </span>uncons_range(<span class="kw-2">&amp;mut </span><span class="self">self</span>, size: usize) -&gt; <span class="prelude-ty">Result</span>&lt;Input::Range, StreamErrorFor&lt;<span class="self">Self</span>&gt;&gt; {
<span class="self">self</span>.input.uncons_range(size).map(|range| {
<span class="self">self</span>.positioner.update_range(<span class="kw-2">&amp;</span>range);
range
})
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>uncons_while&lt;F&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, <span class="kw-2">mut </span>predicate: F) -&gt; <span class="prelude-ty">Result</span>&lt;Input::Range, StreamErrorFor&lt;<span class="self">Self</span>&gt;&gt;
<span class="kw">where
</span>F: FnMut(Input::Token) -&gt; bool,
{
<span class="kw">let </span>positioner = <span class="kw-2">&amp;mut </span><span class="self">self</span>.positioner;
<span class="self">self</span>.input.uncons_while(|t| {
<span class="kw">if </span>predicate(t.clone()) {
positioner.update(<span class="kw-2">&amp;</span>t);
<span class="bool-val">true
</span>} <span class="kw">else </span>{
<span class="bool-val">false
</span>}
})
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>uncons_while1&lt;F&gt;(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
<span class="kw-2">mut </span>predicate: F,
) -&gt; ParseResult&lt;<span class="self">Self</span>::Range, StreamErrorFor&lt;<span class="self">Self</span>&gt;&gt;
<span class="kw">where
</span>F: FnMut(<span class="self">Self</span>::Token) -&gt; bool,
{
<span class="kw">let </span>positioner = <span class="kw-2">&amp;mut </span><span class="self">self</span>.positioner;
<span class="self">self</span>.input.uncons_while1(|t| {
<span class="kw">if </span>predicate(t.clone()) {
positioner.update(<span class="kw-2">&amp;</span>t);
<span class="bool-val">true
</span>} <span class="kw">else </span>{
<span class="bool-val">false
</span>}
})
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>distance(<span class="kw-2">&amp;</span><span class="self">self</span>, end: <span class="kw-2">&amp;</span><span class="self">Self</span>::Checkpoint) -&gt; usize {
<span class="self">self</span>.input.distance(<span class="kw-2">&amp;</span>end.input)
}
<span class="kw">fn </span>range(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Range {
<span class="self">self</span>.input.range()
}
}
<span class="kw">impl</span>&lt;Input, X, S&gt; ResetStream <span class="kw">for </span>Stream&lt;Input, X&gt;
<span class="kw">where
</span>Input: ResetStream,
X: Positioner&lt;Input::Token&gt;,
S: StreamError&lt;Input::Token, Input::Range&gt;,
Input::Error: ParseError&lt;Input::Token, Input::Range, X::Position, StreamError = S&gt;,
Input::Error: ParseError&lt;Input::Token, Input::Range, Input::Position, StreamError = S&gt;,
{
<span class="kw">type </span>Checkpoint = Stream&lt;Input::Checkpoint, X::Checkpoint&gt;;
<span class="kw">fn </span>checkpoint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Checkpoint {
Stream {
input: <span class="self">self</span>.input.checkpoint(),
positioner: <span class="self">self</span>.positioner.checkpoint(),
}
}
<span class="kw">fn </span>reset(<span class="kw-2">&amp;mut </span><span class="self">self</span>, checkpoint: <span class="self">Self</span>::Checkpoint) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="self">Self</span>::Error&gt; {
<span class="self">self</span>.input.reset(checkpoint.input)<span class="question-mark">?</span>;
<span class="self">self</span>.positioner.reset(checkpoint.positioner);
<span class="prelude-val">Ok</span>(())
}
}
<span class="attribute">#[cfg(all(feature = <span class="string">&quot;std&quot;</span>, 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>test_positioner() {
<span class="kw">let </span>input = [<span class="string">&quot;a&quot;</span>.to_string(), <span class="string">&quot;b&quot;</span>.to_string()];
<span class="kw">let </span><span class="kw-2">mut </span>parser = <span class="kw">crate</span>::any();
<span class="kw">let </span>result = parser.parse(Stream::new(<span class="kw-2">&amp;</span>input[..]));
<span class="macro">assert_eq!</span>(
result,
<span class="prelude-val">Ok</span>((
<span class="string">&quot;a&quot;</span>.to_string(),
Stream::with_positioner(
<span class="kw-2">&amp;</span>[<span class="string">&quot;b&quot;</span>.to_string()][..],
IndexPositioner::new_with_position(<span class="number">1</span>)
)
))
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_range_positioner() {
<span class="kw">let </span>input = [<span class="string">&quot;a&quot;</span>.to_string(), <span class="string">&quot;b&quot;</span>.to_string(), <span class="string">&quot;c&quot;</span>.to_string()];
<span class="kw">let </span><span class="kw-2">mut </span>parser = <span class="kw">crate</span>::parser::range::take(<span class="number">2</span>);
<span class="kw">let </span>result = parser.parse(Stream::new(<span class="kw-2">&amp;</span>input[..]));
<span class="macro">assert_eq!</span>(
result,
<span class="prelude-val">Ok</span>((
<span class="kw-2">&amp;</span>[<span class="string">&quot;a&quot;</span>.to_string(), <span class="string">&quot;b&quot;</span>.to_string()][..],
Stream::with_positioner(
<span class="kw-2">&amp;</span>[<span class="string">&quot;c&quot;</span>.to_string()][..],
IndexPositioner::new_with_position(<span class="number">2</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>