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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/toml-0.5.11/src/tokens.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>tokens.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="../../toml/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="../../toml/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 </span>std::borrow::Cow;
<span class="kw">use </span>std::char;
<span class="kw">use </span>std::str;
<span class="kw">use </span>std::string;
<span class="kw">use </span>std::string::String <span class="kw">as </span>StdString;
<span class="kw">use </span><span class="self">self</span>::Token::<span class="kw-2">*</span>;
<span class="doccomment">/// A span, designating a range of bytes where a token is located.
</span><span class="attribute">#[derive(Eq, PartialEq, Debug, Clone, Copy)]
</span><span class="kw">pub struct </span>Span {
<span class="doccomment">/// The start of the range.
</span><span class="kw">pub </span>start: usize,
<span class="doccomment">/// The end of the range (exclusive).
</span><span class="kw">pub </span>end: usize,
}
<span class="kw">impl </span>From&lt;Span&gt; <span class="kw">for </span>(usize, usize) {
<span class="kw">fn </span>from(Span { start, end }: Span) -&gt; (usize, usize) {
(start, end)
}
}
<span class="attribute">#[derive(Eq, PartialEq, Debug)]
</span><span class="kw">pub enum </span>Token&lt;<span class="lifetime">&#39;a</span>&gt; {
Whitespace(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str),
Newline,
Comment(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str),
Equals,
Period,
Comma,
Colon,
Plus,
LeftBrace,
RightBrace,
LeftBracket,
RightBracket,
Keylike(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str),
String {
src: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str,
val: Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;,
multiline: bool,
},
}
<span class="attribute">#[derive(Eq, PartialEq, Debug)]
</span><span class="kw">pub enum </span>Error {
InvalidCharInString(usize, char),
InvalidEscape(usize, char),
InvalidHexEscape(usize, char),
InvalidEscapeValue(usize, u32),
NewlineInString(usize),
Unexpected(usize, char),
UnterminatedString(usize),
NewlineInTableKey(usize),
MultilineStringKey(usize),
Wanted {
at: usize,
expected: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
found: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
},
}
<span class="attribute">#[derive(Clone)]
</span><span class="kw">pub struct </span>Tokenizer&lt;<span class="lifetime">&#39;a</span>&gt; {
input: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str,
chars: CrlfFold&lt;<span class="lifetime">&#39;a</span>&gt;,
}
<span class="attribute">#[derive(Clone)]
</span><span class="kw">struct </span>CrlfFold&lt;<span class="lifetime">&#39;a</span>&gt; {
chars: str::CharIndices&lt;<span class="lifetime">&#39;a</span>&gt;,
}
<span class="attribute">#[derive(Debug)]
</span><span class="kw">enum </span>MaybeString {
NotEscaped(usize),
Owned(string::String),
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Tokenizer&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="kw">pub fn </span>new(input: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str) -&gt; Tokenizer&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>t = Tokenizer {
input,
chars: CrlfFold {
chars: input.char_indices(),
},
};
<span class="comment">// Eat utf-8 BOM
</span>t.eatc(<span class="string">&#39;\u{feff}&#39;</span>);
t
}
<span class="kw">pub fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;(Span, Token&lt;<span class="lifetime">&#39;a</span>&gt;)&gt;, Error&gt; {
<span class="kw">let </span>(start, token) = <span class="kw">match </span><span class="self">self</span>.one() {
<span class="prelude-val">Some</span>((start, <span class="string">&#39;\n&#39;</span>)) =&gt; (start, Newline),
<span class="prelude-val">Some</span>((start, <span class="string">&#39; &#39;</span>)) =&gt; (start, <span class="self">self</span>.whitespace_token(start)),
<span class="prelude-val">Some</span>((start, <span class="string">&#39;\t&#39;</span>)) =&gt; (start, <span class="self">self</span>.whitespace_token(start)),
<span class="prelude-val">Some</span>((start, <span class="string">&#39;#&#39;</span>)) =&gt; (start, <span class="self">self</span>.comment_token(start)),
<span class="prelude-val">Some</span>((start, <span class="string">&#39;=&#39;</span>)) =&gt; (start, Equals),
<span class="prelude-val">Some</span>((start, <span class="string">&#39;.&#39;</span>)) =&gt; (start, Period),
<span class="prelude-val">Some</span>((start, <span class="string">&#39;,&#39;</span>)) =&gt; (start, Comma),
<span class="prelude-val">Some</span>((start, <span class="string">&#39;:&#39;</span>)) =&gt; (start, Colon),
<span class="prelude-val">Some</span>((start, <span class="string">&#39;+&#39;</span>)) =&gt; (start, Plus),
<span class="prelude-val">Some</span>((start, <span class="string">&#39;{&#39;</span>)) =&gt; (start, LeftBrace),
<span class="prelude-val">Some</span>((start, <span class="string">&#39;}&#39;</span>)) =&gt; (start, RightBrace),
<span class="prelude-val">Some</span>((start, <span class="string">&#39;[&#39;</span>)) =&gt; (start, LeftBracket),
<span class="prelude-val">Some</span>((start, <span class="string">&#39;]&#39;</span>)) =&gt; (start, RightBracket),
<span class="prelude-val">Some</span>((start, <span class="string">&#39;\&#39;&#39;</span>)) =&gt; {
<span class="kw">return </span><span class="self">self
</span>.literal_string(start)
.map(|t| <span class="prelude-val">Some</span>((<span class="self">self</span>.step_span(start), t)))
}
<span class="prelude-val">Some</span>((start, <span class="string">&#39;&quot;&#39;</span>)) =&gt; {
<span class="kw">return </span><span class="self">self
</span>.basic_string(start)
.map(|t| <span class="prelude-val">Some</span>((<span class="self">self</span>.step_span(start), t)))
}
<span class="prelude-val">Some</span>((start, ch)) <span class="kw">if </span>is_keylike(ch) =&gt; (start, <span class="self">self</span>.keylike(start)),
<span class="prelude-val">Some</span>((start, ch)) =&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(Error::Unexpected(start, ch)),
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
};
<span class="kw">let </span>span = <span class="self">self</span>.step_span(start);
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>((span, token)))
}
<span class="kw">pub fn </span>peek(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;(Span, Token&lt;<span class="lifetime">&#39;a</span>&gt;)&gt;, Error&gt; {
<span class="self">self</span>.clone().next()
}
<span class="kw">pub fn </span>eat(<span class="kw-2">&amp;mut </span><span class="self">self</span>, expected: Token&lt;<span class="lifetime">&#39;a</span>&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;bool, Error&gt; {
<span class="self">self</span>.eat_spanned(expected).map(|s| s.is_some())
}
<span class="doccomment">/// Eat a value, returning it&#39;s span if it was consumed.
</span><span class="kw">pub fn </span>eat_spanned(<span class="kw-2">&amp;mut </span><span class="self">self</span>, expected: Token&lt;<span class="lifetime">&#39;a</span>&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;Span&gt;, Error&gt; {
<span class="kw">let </span>span = <span class="kw">match </span><span class="self">self</span>.peek()<span class="question-mark">? </span>{
<span class="prelude-val">Some</span>((span, <span class="kw-2">ref </span>found)) <span class="kw">if </span>expected == <span class="kw-2">*</span>found =&gt; span,
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
};
drop(<span class="self">self</span>.next());
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(span))
}
<span class="kw">pub fn </span>expect(<span class="kw-2">&amp;mut </span><span class="self">self</span>, expected: Token&lt;<span class="lifetime">&#39;a</span>&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="comment">// ignore span
</span><span class="kw">let _ </span>= <span class="self">self</span>.expect_spanned(expected)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(())
}
<span class="doccomment">/// Expect the given token returning its span.
</span><span class="kw">pub fn </span>expect_spanned(<span class="kw-2">&amp;mut </span><span class="self">self</span>, expected: Token&lt;<span class="lifetime">&#39;a</span>&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;Span, Error&gt; {
<span class="kw">let </span>current = <span class="self">self</span>.current();
<span class="kw">match </span><span class="self">self</span>.next()<span class="question-mark">? </span>{
<span class="prelude-val">Some</span>((span, found)) =&gt; {
<span class="kw">if </span>expected == found {
<span class="prelude-val">Ok</span>(span)
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(Error::Wanted {
at: current,
expected: expected.describe(),
found: found.describe(),
})
}
}
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(Error::Wanted {
at: <span class="self">self</span>.input.len(),
expected: expected.describe(),
found: <span class="string">&quot;eof&quot;</span>,
}),
}
}
<span class="kw">pub fn </span>table_key(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;(Span, Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;), Error&gt; {
<span class="kw">let </span>current = <span class="self">self</span>.current();
<span class="kw">match </span><span class="self">self</span>.next()<span class="question-mark">? </span>{
<span class="prelude-val">Some</span>((span, Token::Keylike(k))) =&gt; <span class="prelude-val">Ok</span>((span, k.into())),
<span class="prelude-val">Some</span>((
span,
Token::String {
src,
val,
multiline,
},
)) =&gt; {
<span class="kw">let </span>offset = <span class="self">self</span>.substr_offset(src);
<span class="kw">if </span>multiline {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::MultilineStringKey(offset));
}
<span class="kw">match </span>src.find(<span class="string">&#39;\n&#39;</span>) {
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Ok</span>((span, val)),
<span class="prelude-val">Some</span>(i) =&gt; <span class="prelude-val">Err</span>(Error::NewlineInTableKey(offset + i)),
}
}
<span class="prelude-val">Some</span>((<span class="kw">_</span>, other)) =&gt; <span class="prelude-val">Err</span>(Error::Wanted {
at: current,
expected: <span class="string">&quot;a table key&quot;</span>,
found: other.describe(),
}),
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(Error::Wanted {
at: <span class="self">self</span>.input.len(),
expected: <span class="string">&quot;a table key&quot;</span>,
found: <span class="string">&quot;eof&quot;</span>,
}),
}
}
<span class="kw">pub fn </span>eat_whitespace(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="kw">while </span><span class="self">self</span>.eatc(<span class="string">&#39; &#39;</span>) || <span class="self">self</span>.eatc(<span class="string">&#39;\t&#39;</span>) {
<span class="comment">// ...
</span>}
<span class="prelude-val">Ok</span>(())
}
<span class="kw">pub fn </span>eat_comment(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;bool, Error&gt; {
<span class="kw">if </span>!<span class="self">self</span>.eatc(<span class="string">&#39;#&#39;</span>) {
<span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="bool-val">false</span>);
}
drop(<span class="self">self</span>.comment_token(<span class="number">0</span>));
<span class="self">self</span>.eat_newline_or_eof().map(|()| <span class="bool-val">true</span>)
}
<span class="kw">pub fn </span>eat_newline_or_eof(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt; {
<span class="kw">let </span>current = <span class="self">self</span>.current();
<span class="kw">match </span><span class="self">self</span>.next()<span class="question-mark">? </span>{
<span class="prelude-val">None </span>| <span class="prelude-val">Some</span>((<span class="kw">_</span>, Token::Newline)) =&gt; <span class="prelude-val">Ok</span>(()),
<span class="prelude-val">Some</span>((<span class="kw">_</span>, other)) =&gt; <span class="prelude-val">Err</span>(Error::Wanted {
at: current,
expected: <span class="string">&quot;newline&quot;</span>,
found: other.describe(),
}),
}
}
<span class="kw">pub fn </span>skip_to_newline(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
<span class="kw">loop </span>{
<span class="kw">match </span><span class="self">self</span>.one() {
<span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">&#39;\n&#39;</span>)) | <span class="prelude-val">None </span>=&gt; <span class="kw">break</span>,
<span class="kw">_ </span>=&gt; {}
}
}
}
<span class="kw">fn </span>eatc(<span class="kw-2">&amp;mut </span><span class="self">self</span>, ch: char) -&gt; bool {
<span class="kw">match </span><span class="self">self</span>.chars.clone().next() {
<span class="prelude-val">Some</span>((<span class="kw">_</span>, ch2)) <span class="kw">if </span>ch == ch2 =&gt; {
<span class="self">self</span>.one();
<span class="bool-val">true
</span>}
<span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
}
}
<span class="kw">pub fn </span>current(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.chars
.clone()
.next()
.map(|i| i.<span class="number">0</span>)
.unwrap_or_else(|| <span class="self">self</span>.input.len())
}
<span class="kw">pub fn </span>input(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str {
<span class="self">self</span>.input
}
<span class="kw">fn </span>whitespace_token(<span class="kw-2">&amp;mut </span><span class="self">self</span>, start: usize) -&gt; Token&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="kw">while </span><span class="self">self</span>.eatc(<span class="string">&#39; &#39;</span>) || <span class="self">self</span>.eatc(<span class="string">&#39;\t&#39;</span>) {
<span class="comment">// ...
</span>}
Whitespace(<span class="kw-2">&amp;</span><span class="self">self</span>.input[start..<span class="self">self</span>.current()])
}
<span class="kw">fn </span>comment_token(<span class="kw-2">&amp;mut </span><span class="self">self</span>, start: usize) -&gt; Token&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="kw">while let </span><span class="prelude-val">Some</span>((<span class="kw">_</span>, ch)) = <span class="self">self</span>.chars.clone().next() {
<span class="kw">if </span>ch != <span class="string">&#39;\t&#39; </span>&amp;&amp; !(<span class="string">&#39;\u{20}&#39;</span>..=<span class="string">&#39;\u{10ffff}&#39;</span>).contains(<span class="kw-2">&amp;</span>ch) {
<span class="kw">break</span>;
}
<span class="self">self</span>.one();
}
Comment(<span class="kw-2">&amp;</span><span class="self">self</span>.input[start..<span class="self">self</span>.current()])
}
<span class="attribute">#[allow(clippy::type_complexity)]
</span><span class="kw">fn </span>read_string(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
delim: char,
start: usize,
new_ch: <span class="kw-2">&amp;mut </span><span class="kw">dyn </span>FnMut(
<span class="kw-2">&amp;mut </span>Tokenizer&lt;<span class="lifetime">&#39;_</span>&gt;,
<span class="kw-2">&amp;mut </span>MaybeString,
bool,
usize,
char,
) -&gt; <span class="prelude-ty">Result</span>&lt;(), Error&gt;,
) -&gt; <span class="prelude-ty">Result</span>&lt;Token&lt;<span class="lifetime">&#39;a</span>&gt;, Error&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>multiline = <span class="bool-val">false</span>;
<span class="kw">if </span><span class="self">self</span>.eatc(delim) {
<span class="kw">if </span><span class="self">self</span>.eatc(delim) {
multiline = <span class="bool-val">true</span>;
} <span class="kw">else </span>{
<span class="kw">return </span><span class="prelude-val">Ok</span>(String {
src: <span class="kw-2">&amp;</span><span class="self">self</span>.input[start..start + <span class="number">2</span>],
val: Cow::Borrowed(<span class="string">&quot;&quot;</span>),
multiline: <span class="bool-val">false</span>,
});
}
}
<span class="kw">let </span><span class="kw-2">mut </span>val = MaybeString::NotEscaped(<span class="self">self</span>.current());
<span class="kw">let </span><span class="kw-2">mut </span>n = <span class="number">0</span>;
<span class="lifetime">&#39;outer</span>: <span class="kw">loop </span>{
n += <span class="number">1</span>;
<span class="kw">match </span><span class="self">self</span>.one() {
<span class="prelude-val">Some</span>((i, <span class="string">&#39;\n&#39;</span>)) =&gt; {
<span class="kw">if </span>multiline {
<span class="kw">if </span><span class="self">self</span>.input.as_bytes()[i] == <span class="string">b&#39;\r&#39; </span>{
val.to_owned(<span class="kw-2">&amp;</span><span class="self">self</span>.input[..i]);
}
<span class="kw">if </span>n == <span class="number">1 </span>{
val = MaybeString::NotEscaped(<span class="self">self</span>.current());
} <span class="kw">else </span>{
val.push(<span class="string">&#39;\n&#39;</span>);
}
<span class="kw">continue</span>;
} <span class="kw">else </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::NewlineInString(i));
}
}
<span class="prelude-val">Some</span>((<span class="kw-2">mut </span>i, ch)) <span class="kw">if </span>ch == delim =&gt; {
<span class="kw">if </span>multiline {
<span class="kw">if </span>!<span class="self">self</span>.eatc(delim) {
val.push(delim);
<span class="kw">continue </span><span class="lifetime">&#39;outer</span>;
}
<span class="kw">if </span>!<span class="self">self</span>.eatc(delim) {
val.push(delim);
val.push(delim);
<span class="kw">continue </span><span class="lifetime">&#39;outer</span>;
}
<span class="kw">if </span><span class="self">self</span>.eatc(delim) {
val.push(delim);
i += <span class="number">1</span>;
}
<span class="kw">if </span><span class="self">self</span>.eatc(delim) {
val.push(delim);
i += <span class="number">1</span>;
}
}
<span class="kw">return </span><span class="prelude-val">Ok</span>(String {
src: <span class="kw-2">&amp;</span><span class="self">self</span>.input[start..<span class="self">self</span>.current()],
val: val.into_cow(<span class="kw-2">&amp;</span><span class="self">self</span>.input[..i]),
multiline,
});
}
<span class="prelude-val">Some</span>((i, c)) =&gt; new_ch(<span class="self">self</span>, <span class="kw-2">&amp;mut </span>val, multiline, i, c)<span class="question-mark">?</span>,
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(Error::UnterminatedString(start)),
}
}
}
<span class="kw">fn </span>literal_string(<span class="kw-2">&amp;mut </span><span class="self">self</span>, start: usize) -&gt; <span class="prelude-ty">Result</span>&lt;Token&lt;<span class="lifetime">&#39;a</span>&gt;, Error&gt; {
<span class="self">self</span>.read_string(<span class="string">&#39;\&#39;&#39;</span>, start, <span class="kw-2">&amp;mut </span>|_me, val, _multi, i, ch| {
<span class="kw">if </span>ch == <span class="string">&#39;\u{09}&#39; </span>|| ((<span class="string">&#39;\u{20}&#39;</span>..=<span class="string">&#39;\u{10ffff}&#39;</span>).contains(<span class="kw-2">&amp;</span>ch) &amp;&amp; ch != <span class="string">&#39;\u{7f}&#39;</span>) {
val.push(ch);
<span class="prelude-val">Ok</span>(())
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(Error::InvalidCharInString(i, ch))
}
})
}
<span class="kw">fn </span>basic_string(<span class="kw-2">&amp;mut </span><span class="self">self</span>, start: usize) -&gt; <span class="prelude-ty">Result</span>&lt;Token&lt;<span class="lifetime">&#39;a</span>&gt;, Error&gt; {
<span class="self">self</span>.read_string(<span class="string">&#39;&quot;&#39;</span>, start, <span class="kw-2">&amp;mut </span>|me, val, multi, i, ch| <span class="kw">match </span>ch {
<span class="string">&#39;\\&#39; </span>=&gt; {
val.to_owned(<span class="kw-2">&amp;</span>me.input[..i]);
<span class="kw">match </span>me.chars.next() {
<span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">&#39;&quot;&#39;</span>)) =&gt; val.push(<span class="string">&#39;&quot;&#39;</span>),
<span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">&#39;\\&#39;</span>)) =&gt; val.push(<span class="string">&#39;\\&#39;</span>),
<span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">&#39;b&#39;</span>)) =&gt; val.push(<span class="string">&#39;\u{8}&#39;</span>),
<span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">&#39;f&#39;</span>)) =&gt; val.push(<span class="string">&#39;\u{c}&#39;</span>),
<span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">&#39;n&#39;</span>)) =&gt; val.push(<span class="string">&#39;\n&#39;</span>),
<span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">&#39;r&#39;</span>)) =&gt; val.push(<span class="string">&#39;\r&#39;</span>),
<span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">&#39;t&#39;</span>)) =&gt; val.push(<span class="string">&#39;\t&#39;</span>),
<span class="prelude-val">Some</span>((i, c @ <span class="string">&#39;u&#39;</span>)) | <span class="prelude-val">Some</span>((i, c @ <span class="string">&#39;U&#39;</span>)) =&gt; {
<span class="kw">let </span>len = <span class="kw">if </span>c == <span class="string">&#39;u&#39; </span>{ <span class="number">4 </span>} <span class="kw">else </span>{ <span class="number">8 </span>};
val.push(me.hex(start, i, len)<span class="question-mark">?</span>);
}
<span class="prelude-val">Some</span>((i, c @ <span class="string">&#39; &#39;</span>)) | <span class="prelude-val">Some</span>((i, c @ <span class="string">&#39;\t&#39;</span>)) | <span class="prelude-val">Some</span>((i, c @ <span class="string">&#39;\n&#39;</span>)) <span class="kw">if </span>multi =&gt; {
<span class="kw">if </span>c != <span class="string">&#39;\n&#39; </span>{
<span class="kw">while let </span><span class="prelude-val">Some</span>((<span class="kw">_</span>, ch)) = me.chars.clone().next() {
<span class="kw">match </span>ch {
<span class="string">&#39; &#39; </span>| <span class="string">&#39;\t&#39; </span>=&gt; {
me.chars.next();
<span class="kw">continue</span>;
}
<span class="string">&#39;\n&#39; </span>=&gt; {
me.chars.next();
<span class="kw">break</span>;
}
<span class="kw">_ </span>=&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidEscape(i, c)),
}
}
}
<span class="kw">while let </span><span class="prelude-val">Some</span>((<span class="kw">_</span>, ch)) = me.chars.clone().next() {
<span class="kw">match </span>ch {
<span class="string">&#39; &#39; </span>| <span class="string">&#39;\t&#39; </span>| <span class="string">&#39;\n&#39; </span>=&gt; {
me.chars.next();
}
<span class="kw">_ </span>=&gt; <span class="kw">break</span>,
}
}
}
<span class="prelude-val">Some</span>((i, c)) =&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidEscape(i, c)),
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(Error::UnterminatedString(start)),
}
<span class="prelude-val">Ok</span>(())
}
ch <span class="kw">if </span>ch == <span class="string">&#39;\u{09}&#39; </span>|| ((<span class="string">&#39;\u{20}&#39;</span>..=<span class="string">&#39;\u{10ffff}&#39;</span>).contains(<span class="kw-2">&amp;</span>ch) &amp;&amp; ch != <span class="string">&#39;\u{7f}&#39;</span>) =&gt; {
val.push(ch);
<span class="prelude-val">Ok</span>(())
}
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(Error::InvalidCharInString(i, ch)),
})
}
<span class="kw">fn </span>hex(<span class="kw-2">&amp;mut </span><span class="self">self</span>, start: usize, i: usize, len: usize) -&gt; <span class="prelude-ty">Result</span>&lt;char, Error&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>buf = StdString::with_capacity(len);
<span class="kw">for _ in </span><span class="number">0</span>..len {
<span class="kw">match </span><span class="self">self</span>.one() {
<span class="prelude-val">Some</span>((<span class="kw">_</span>, ch)) <span class="kw">if </span>ch <span class="kw">as </span>u32 &lt;= <span class="number">0x7F </span>&amp;&amp; ch.is_ascii_hexdigit() =&gt; buf.push(ch),
<span class="prelude-val">Some</span>((i, ch)) =&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidHexEscape(i, ch)),
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(Error::UnterminatedString(start)),
}
}
<span class="kw">let </span>val = u32::from_str_radix(<span class="kw-2">&amp;</span>buf, <span class="number">16</span>).unwrap();
<span class="kw">match </span>char::from_u32(val) {
<span class="prelude-val">Some</span>(ch) =&gt; <span class="prelude-val">Ok</span>(ch),
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(Error::InvalidEscapeValue(i, val)),
}
}
<span class="kw">fn </span>keylike(<span class="kw-2">&amp;mut </span><span class="self">self</span>, start: usize) -&gt; Token&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="kw">while let </span><span class="prelude-val">Some</span>((<span class="kw">_</span>, ch)) = <span class="self">self</span>.peek_one() {
<span class="kw">if </span>!is_keylike(ch) {
<span class="kw">break</span>;
}
<span class="self">self</span>.one();
}
Keylike(<span class="kw-2">&amp;</span><span class="self">self</span>.input[start..<span class="self">self</span>.current()])
}
<span class="kw">pub fn </span>substr_offset(<span class="kw-2">&amp;</span><span class="self">self</span>, s: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str) -&gt; usize {
<span class="macro">assert!</span>(s.len() &lt;= <span class="self">self</span>.input.len());
<span class="kw">let </span>a = <span class="self">self</span>.input.as_ptr() <span class="kw">as </span>usize;
<span class="kw">let </span>b = s.as_ptr() <span class="kw">as </span>usize;
<span class="macro">assert!</span>(a &lt;= b);
b - a
}
<span class="doccomment">/// Calculate the span of a single character.
</span><span class="kw">fn </span>step_span(<span class="kw-2">&amp;mut </span><span class="self">self</span>, start: usize) -&gt; Span {
<span class="kw">let </span>end = <span class="self">self
</span>.peek_one()
.map(|t| t.<span class="number">0</span>)
.unwrap_or_else(|| <span class="self">self</span>.input.len());
Span { start, end }
}
<span class="doccomment">/// Peek one char without consuming it.
</span><span class="kw">fn </span>peek_one(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;(usize, char)&gt; {
<span class="self">self</span>.chars.clone().next()
}
<span class="doccomment">/// Take one char.
</span><span class="kw">pub fn </span>one(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;(usize, char)&gt; {
<span class="self">self</span>.chars.next()
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Iterator <span class="kw">for </span>CrlfFold&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="kw">type </span>Item = (usize, char);
<span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;(usize, char)&gt; {
<span class="self">self</span>.chars.next().map(|(i, c)| {
<span class="kw">if </span>c == <span class="string">&#39;\r&#39; </span>{
<span class="kw">let </span><span class="kw-2">mut </span>attempt = <span class="self">self</span>.chars.clone();
<span class="kw">if let </span><span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="string">&#39;\n&#39;</span>)) = attempt.next() {
<span class="self">self</span>.chars = attempt;
<span class="kw">return </span>(i, <span class="string">&#39;\n&#39;</span>);
}
}
(i, c)
})
}
}
<span class="kw">impl </span>MaybeString {
<span class="kw">fn </span>push(<span class="kw-2">&amp;mut </span><span class="self">self</span>, ch: char) {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
MaybeString::NotEscaped(..) =&gt; {}
MaybeString::Owned(<span class="kw-2">ref mut </span>s) =&gt; s.push(ch),
}
}
<span class="attribute">#[allow(clippy::wrong_self_convention)]
</span><span class="kw">fn </span>to_owned(<span class="kw-2">&amp;mut </span><span class="self">self</span>, input: <span class="kw-2">&amp;</span>str) {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
MaybeString::NotEscaped(start) =&gt; {
<span class="kw-2">*</span><span class="self">self </span>= MaybeString::Owned(input[start..].to_owned());
}
MaybeString::Owned(..) =&gt; {}
}
}
<span class="kw">fn </span>into_cow(<span class="self">self</span>, input: <span class="kw-2">&amp;</span>str) -&gt; Cow&lt;<span class="lifetime">&#39;_</span>, str&gt; {
<span class="kw">match </span><span class="self">self </span>{
MaybeString::NotEscaped(start) =&gt; Cow::Borrowed(<span class="kw-2">&amp;</span>input[start..]),
MaybeString::Owned(s) =&gt; Cow::Owned(s),
}
}
}
<span class="kw">fn </span>is_keylike(ch: char) -&gt; bool {
(<span class="string">&#39;A&#39;</span>..=<span class="string">&#39;Z&#39;</span>).contains(<span class="kw-2">&amp;</span>ch)
|| (<span class="string">&#39;a&#39;</span>..=<span class="string">&#39;z&#39;</span>).contains(<span class="kw-2">&amp;</span>ch)
|| (<span class="string">&#39;0&#39;</span>..=<span class="string">&#39;9&#39;</span>).contains(<span class="kw-2">&amp;</span>ch)
|| ch == <span class="string">&#39;-&#39;
</span>|| ch == <span class="string">&#39;_&#39;
</span>}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Token&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="kw">pub fn </span>describe(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
Token::Keylike(<span class="kw">_</span>) =&gt; <span class="string">&quot;an identifier&quot;</span>,
Token::Equals =&gt; <span class="string">&quot;an equals&quot;</span>,
Token::Period =&gt; <span class="string">&quot;a period&quot;</span>,
Token::Comment(<span class="kw">_</span>) =&gt; <span class="string">&quot;a comment&quot;</span>,
Token::Newline =&gt; <span class="string">&quot;a newline&quot;</span>,
Token::Whitespace(<span class="kw">_</span>) =&gt; <span class="string">&quot;whitespace&quot;</span>,
Token::Comma =&gt; <span class="string">&quot;a comma&quot;</span>,
Token::RightBrace =&gt; <span class="string">&quot;a right brace&quot;</span>,
Token::LeftBrace =&gt; <span class="string">&quot;a left brace&quot;</span>,
Token::RightBracket =&gt; <span class="string">&quot;a right bracket&quot;</span>,
Token::LeftBracket =&gt; <span class="string">&quot;a left bracket&quot;</span>,
Token::String { multiline, .. } =&gt; {
<span class="kw">if </span>multiline {
<span class="string">&quot;a multiline string&quot;
</span>} <span class="kw">else </span>{
<span class="string">&quot;a string&quot;
</span>}
}
Token::Colon =&gt; <span class="string">&quot;a colon&quot;</span>,
Token::Plus =&gt; <span class="string">&quot;a plus&quot;</span>,
}
}
}
<span class="attribute">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use super</span>::{Error, Token, Tokenizer};
<span class="kw">use </span>std::borrow::Cow;
<span class="kw">fn </span>err(input: <span class="kw-2">&amp;</span>str, err: Error) {
<span class="kw">let </span><span class="kw-2">mut </span>t = Tokenizer::new(input);
<span class="kw">let </span>token = t.next().unwrap_err();
<span class="macro">assert_eq!</span>(token, err);
<span class="macro">assert!</span>(t.next().unwrap().is_none());
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>literal_strings() {
<span class="kw">fn </span>t(input: <span class="kw-2">&amp;</span>str, val: <span class="kw-2">&amp;</span>str, multiline: bool) {
<span class="kw">let </span><span class="kw-2">mut </span>t = Tokenizer::new(input);
<span class="kw">let </span>(<span class="kw">_</span>, token) = t.next().unwrap().unwrap();
<span class="macro">assert_eq!</span>(
token,
Token::String {
src: input,
val: Cow::Borrowed(val),
multiline,
}
);
<span class="macro">assert!</span>(t.next().unwrap().is_none());
}
t(<span class="string">&quot;&#39;&#39;&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">&quot;&#39;&#39;&#39;&#39;&#39;&#39;&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="bool-val">true</span>);
t(<span class="string">&quot;&#39;&#39;&#39;\n&#39;&#39;&#39;&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="bool-val">true</span>);
t(<span class="string">&quot;&#39;a&#39;&quot;</span>, <span class="string">&quot;a&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">&quot;&#39;\&quot;a&#39;&quot;</span>, <span class="string">&quot;\&quot;a&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">&quot;&#39;&#39;&#39;&#39;a&#39;&#39;&#39;&quot;</span>, <span class="string">&quot;&#39;a&quot;</span>, <span class="bool-val">true</span>);
t(<span class="string">&quot;&#39;&#39;&#39;\n&#39;a\n&#39;&#39;&#39;&quot;</span>, <span class="string">&quot;&#39;a\n&quot;</span>, <span class="bool-val">true</span>);
t(<span class="string">&quot;&#39;&#39;&#39;a\n&#39;a\r\n&#39;&#39;&#39;&quot;</span>, <span class="string">&quot;a\n&#39;a\n&quot;</span>, <span class="bool-val">true</span>);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>basic_strings() {
<span class="kw">fn </span>t(input: <span class="kw-2">&amp;</span>str, val: <span class="kw-2">&amp;</span>str, multiline: bool) {
<span class="kw">let </span><span class="kw-2">mut </span>t = Tokenizer::new(input);
<span class="kw">let </span>(<span class="kw">_</span>, token) = t.next().unwrap().unwrap();
<span class="macro">assert_eq!</span>(
token,
Token::String {
src: input,
val: Cow::Borrowed(val),
multiline,
}
);
<span class="macro">assert!</span>(t.next().unwrap().is_none());
}
t(<span class="string">r#&quot;&quot;&quot;&quot;#</span>, <span class="string">&quot;&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">r#&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;#</span>, <span class="string">&quot;&quot;</span>, <span class="bool-val">true</span>);
t(<span class="string">r#&quot;&quot;a&quot;&quot;#</span>, <span class="string">&quot;a&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">r#&quot;&quot;&quot;&quot;a&quot;&quot;&quot;&quot;#</span>, <span class="string">&quot;a&quot;</span>, <span class="bool-val">true</span>);
t(<span class="string">r#&quot;&quot;\t&quot;&quot;#</span>, <span class="string">&quot;\t&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">r#&quot;&quot;\u0000&quot;&quot;#</span>, <span class="string">&quot;\0&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">r#&quot;&quot;\U00000000&quot;&quot;#</span>, <span class="string">&quot;\0&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">r#&quot;&quot;\U000A0000&quot;&quot;#</span>, <span class="string">&quot;\u{A0000}&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">r#&quot;&quot;\\t&quot;&quot;#</span>, <span class="string">&quot;\\t&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">&quot;\&quot;\t\&quot;&quot;</span>, <span class="string">&quot;\t&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">&quot;\&quot;\&quot;\&quot;\n\t\&quot;\&quot;\&quot;&quot;</span>, <span class="string">&quot;\t&quot;</span>, <span class="bool-val">true</span>);
t(<span class="string">&quot;\&quot;\&quot;\&quot;\\\n\&quot;\&quot;\&quot;&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="bool-val">true</span>);
t(
<span class="string">&quot;\&quot;\&quot;\&quot;\\\n \t \t \\\r\n \t \n \t \r\n\&quot;\&quot;\&quot;&quot;</span>,
<span class="string">&quot;&quot;</span>,
<span class="bool-val">true</span>,
);
t(<span class="string">r#&quot;&quot;\r&quot;&quot;#</span>, <span class="string">&quot;\r&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">r#&quot;&quot;\n&quot;&quot;#</span>, <span class="string">&quot;\n&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">r#&quot;&quot;\b&quot;&quot;#</span>, <span class="string">&quot;\u{8}&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">r#&quot;&quot;a\fa&quot;&quot;#</span>, <span class="string">&quot;a\u{c}a&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">r#&quot;&quot;\&quot;a&quot;&quot;#</span>, <span class="string">&quot;\&quot;a&quot;</span>, <span class="bool-val">false</span>);
t(<span class="string">&quot;\&quot;\&quot;\&quot;\na\&quot;\&quot;\&quot;&quot;</span>, <span class="string">&quot;a&quot;</span>, <span class="bool-val">true</span>);
t(<span class="string">&quot;\&quot;\&quot;\&quot;\n\&quot;\&quot;\&quot;&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="bool-val">true</span>);
t(<span class="string">r#&quot;&quot;&quot;&quot;a\&quot;&quot;&quot;b&quot;&quot;&quot;&quot;#</span>, <span class="string">&quot;a\&quot;\&quot;\&quot;b&quot;</span>, <span class="bool-val">true</span>);
err(<span class="string">r#&quot;&quot;\a&quot;#</span>, Error::InvalidEscape(<span class="number">2</span>, <span class="string">&#39;a&#39;</span>));
err(<span class="string">&quot;\&quot;\\\n&quot;</span>, Error::InvalidEscape(<span class="number">2</span>, <span class="string">&#39;\n&#39;</span>));
err(<span class="string">&quot;\&quot;\\\r\n&quot;</span>, Error::InvalidEscape(<span class="number">2</span>, <span class="string">&#39;\n&#39;</span>));
err(<span class="string">&quot;\&quot;\\&quot;</span>, Error::UnterminatedString(<span class="number">0</span>));
err(<span class="string">&quot;\&quot;\u{0}&quot;</span>, Error::InvalidCharInString(<span class="number">1</span>, <span class="string">&#39;\u{0}&#39;</span>));
err(<span class="string">r#&quot;&quot;\U00&quot;&quot;#</span>, Error::InvalidHexEscape(<span class="number">5</span>, <span class="string">&#39;&quot;&#39;</span>));
err(<span class="string">r#&quot;&quot;\U00&quot;#</span>, Error::UnterminatedString(<span class="number">0</span>));
err(<span class="string">r#&quot;&quot;\uD800&quot;#</span>, Error::InvalidEscapeValue(<span class="number">2</span>, <span class="number">0xd800</span>));
err(<span class="string">r#&quot;&quot;\UFFFFFFFF&quot;#</span>, Error::InvalidEscapeValue(<span class="number">2</span>, <span class="number">0xffff_ffff</span>));
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>keylike() {
<span class="kw">fn </span>t(input: <span class="kw-2">&amp;</span>str) {
<span class="kw">let </span><span class="kw-2">mut </span>t = Tokenizer::new(input);
<span class="kw">let </span>(<span class="kw">_</span>, token) = t.next().unwrap().unwrap();
<span class="macro">assert_eq!</span>(token, Token::Keylike(input));
<span class="macro">assert!</span>(t.next().unwrap().is_none());
}
t(<span class="string">&quot;foo&quot;</span>);
t(<span class="string">&quot;0bar&quot;</span>);
t(<span class="string">&quot;bar0&quot;</span>);
t(<span class="string">&quot;1234&quot;</span>);
t(<span class="string">&quot;a-b&quot;</span>);
t(<span class="string">&quot;a_B&quot;</span>);
t(<span class="string">&quot;-_-&quot;</span>);
t(<span class="string">&quot;___&quot;</span>);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>all() {
<span class="kw">fn </span>t(input: <span class="kw-2">&amp;</span>str, expected: <span class="kw-2">&amp;</span>[((usize, usize), Token&lt;<span class="lifetime">&#39;_</span>&gt;, <span class="kw-2">&amp;</span>str)]) {
<span class="kw">let </span><span class="kw-2">mut </span>tokens = Tokenizer::new(input);
<span class="kw">let </span><span class="kw-2">mut </span>actual: Vec&lt;((usize, usize), Token&lt;<span class="lifetime">&#39;_</span>&gt;, <span class="kw-2">&amp;</span>str)&gt; = Vec::new();
<span class="kw">while let </span><span class="prelude-val">Some</span>((span, token)) = tokens.next().unwrap() {
actual.push((span.into(), token, <span class="kw-2">&amp;</span>input[span.start..span.end]));
}
<span class="kw">for </span>(a, b) <span class="kw">in </span>actual.iter().zip(expected) {
<span class="macro">assert_eq!</span>(a, b);
}
<span class="macro">assert_eq!</span>(actual.len(), expected.len());
}
t(
<span class="string">&quot; a &quot;</span>,
<span class="kw-2">&amp;</span>[
((<span class="number">0</span>, <span class="number">1</span>), Token::Whitespace(<span class="string">&quot; &quot;</span>), <span class="string">&quot; &quot;</span>),
((<span class="number">1</span>, <span class="number">2</span>), Token::Keylike(<span class="string">&quot;a&quot;</span>), <span class="string">&quot;a&quot;</span>),
((<span class="number">2</span>, <span class="number">3</span>), Token::Whitespace(<span class="string">&quot; &quot;</span>), <span class="string">&quot; &quot;</span>),
],
);
t(
<span class="string">&quot; a\t [[]] \t [] {} , . =\n# foo \r\n#foo \n &quot;</span>,
<span class="kw-2">&amp;</span>[
((<span class="number">0</span>, <span class="number">1</span>), Token::Whitespace(<span class="string">&quot; &quot;</span>), <span class="string">&quot; &quot;</span>),
((<span class="number">1</span>, <span class="number">2</span>), Token::Keylike(<span class="string">&quot;a&quot;</span>), <span class="string">&quot;a&quot;</span>),
((<span class="number">2</span>, <span class="number">4</span>), Token::Whitespace(<span class="string">&quot;\t &quot;</span>), <span class="string">&quot;\t &quot;</span>),
((<span class="number">4</span>, <span class="number">5</span>), Token::LeftBracket, <span class="string">&quot;[&quot;</span>),
((<span class="number">5</span>, <span class="number">6</span>), Token::LeftBracket, <span class="string">&quot;[&quot;</span>),
((<span class="number">6</span>, <span class="number">7</span>), Token::RightBracket, <span class="string">&quot;]&quot;</span>),
((<span class="number">7</span>, <span class="number">8</span>), Token::RightBracket, <span class="string">&quot;]&quot;</span>),
((<span class="number">8</span>, <span class="number">11</span>), Token::Whitespace(<span class="string">&quot; \t &quot;</span>), <span class="string">&quot; \t &quot;</span>),
((<span class="number">11</span>, <span class="number">12</span>), Token::LeftBracket, <span class="string">&quot;[&quot;</span>),
((<span class="number">12</span>, <span class="number">13</span>), Token::RightBracket, <span class="string">&quot;]&quot;</span>),
((<span class="number">13</span>, <span class="number">14</span>), Token::Whitespace(<span class="string">&quot; &quot;</span>), <span class="string">&quot; &quot;</span>),
((<span class="number">14</span>, <span class="number">15</span>), Token::LeftBrace, <span class="string">&quot;{&quot;</span>),
((<span class="number">15</span>, <span class="number">16</span>), Token::RightBrace, <span class="string">&quot;}&quot;</span>),
((<span class="number">16</span>, <span class="number">17</span>), Token::Whitespace(<span class="string">&quot; &quot;</span>), <span class="string">&quot; &quot;</span>),
((<span class="number">17</span>, <span class="number">18</span>), Token::Comma, <span class="string">&quot;,&quot;</span>),
((<span class="number">18</span>, <span class="number">19</span>), Token::Whitespace(<span class="string">&quot; &quot;</span>), <span class="string">&quot; &quot;</span>),
((<span class="number">19</span>, <span class="number">20</span>), Token::Period, <span class="string">&quot;.&quot;</span>),
((<span class="number">20</span>, <span class="number">21</span>), Token::Whitespace(<span class="string">&quot; &quot;</span>), <span class="string">&quot; &quot;</span>),
((<span class="number">21</span>, <span class="number">22</span>), Token::Equals, <span class="string">&quot;=&quot;</span>),
((<span class="number">22</span>, <span class="number">23</span>), Token::Newline, <span class="string">&quot;\n&quot;</span>),
((<span class="number">23</span>, <span class="number">29</span>), Token::Comment(<span class="string">&quot;# foo &quot;</span>), <span class="string">&quot;# foo &quot;</span>),
((<span class="number">29</span>, <span class="number">31</span>), Token::Newline, <span class="string">&quot;\r\n&quot;</span>),
((<span class="number">31</span>, <span class="number">36</span>), Token::Comment(<span class="string">&quot;#foo &quot;</span>), <span class="string">&quot;#foo &quot;</span>),
((<span class="number">36</span>, <span class="number">37</span>), Token::Newline, <span class="string">&quot;\n&quot;</span>),
((<span class="number">37</span>, <span class="number">38</span>), Token::Whitespace(<span class="string">&quot; &quot;</span>), <span class="string">&quot; &quot;</span>),
],
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>bare_cr_bad() {
err(<span class="string">&quot;\r&quot;</span>, Error::Unexpected(<span class="number">0</span>, <span class="string">&#39;\r&#39;</span>));
err(<span class="string">&quot;&#39;\n&quot;</span>, Error::NewlineInString(<span class="number">1</span>));
err(<span class="string">&quot;&#39;\u{0}&quot;</span>, Error::InvalidCharInString(<span class="number">1</span>, <span class="string">&#39;\u{0}&#39;</span>));
err(<span class="string">&quot;&#39;&quot;</span>, Error::UnterminatedString(<span class="number">0</span>));
err(<span class="string">&quot;\u{0}&quot;</span>, Error::Unexpected(<span class="number">0</span>, <span class="string">&#39;\u{0}&#39;</span>));
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>bad_comment() {
<span class="kw">let </span><span class="kw-2">mut </span>t = Tokenizer::new(<span class="string">&quot;#\u{0}&quot;</span>);
t.next().unwrap().unwrap();
<span class="macro">assert_eq!</span>(t.next(), <span class="prelude-val">Err</span>(Error::Unexpected(<span class="number">1</span>, <span class="string">&#39;\u{0}&#39;</span>)));
<span class="macro">assert!</span>(t.next().unwrap().is_none());
}
}
</code></pre></div>
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