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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/serde_json-1.0.96/src/de.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>de.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="../../serde_json/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="../../serde_json/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">//! Deserialize JSON data to a Rust data structure.
</span><span class="kw">use </span><span class="kw">crate</span>::error::{Error, ErrorCode, <span class="prelude-ty">Result</span>};
<span class="attribute">#[cfg(feature = <span class="string">&quot;float_roundtrip&quot;</span>)]
</span><span class="kw">use </span><span class="kw">crate</span>::lexical;
<span class="kw">use </span><span class="kw">crate</span>::number::Number;
<span class="kw">use </span><span class="kw">crate</span>::read::{<span class="self">self</span>, Fused, Reference};
<span class="kw">use </span>alloc::string::String;
<span class="kw">use </span>alloc::vec::Vec;
<span class="attribute">#[cfg(feature = <span class="string">&quot;float_roundtrip&quot;</span>)]
</span><span class="kw">use </span>core::iter;
<span class="kw">use </span>core::iter::FusedIterator;
<span class="kw">use </span>core::marker::PhantomData;
<span class="kw">use </span>core::result;
<span class="kw">use </span>core::str::FromStr;
<span class="kw">use </span>serde::de::{<span class="self">self</span>, Expected, Unexpected};
<span class="kw">use </span>serde::forward_to_deserialize_any;
<span class="attribute">#[cfg(feature = <span class="string">&quot;arbitrary_precision&quot;</span>)]
</span><span class="kw">use </span><span class="kw">crate</span>::number::NumberDeserializer;
<span class="kw">pub use </span><span class="kw">crate</span>::read::{Read, SliceRead, StrRead};
<span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="kw">pub use </span><span class="kw">crate</span>::read::IoRead;
<span class="comment">//////////////////////////////////////////////////////////////////////////////
</span><span class="doccomment">/// A structure that deserializes JSON into Rust values.
</span><span class="kw">pub struct </span>Deserializer&lt;R&gt; {
read: R,
scratch: Vec&lt;u8&gt;,
remaining_depth: u8,
<span class="attribute">#[cfg(feature = <span class="string">&quot;float_roundtrip&quot;</span>)]
</span>single_precision: bool,
<span class="attribute">#[cfg(feature = <span class="string">&quot;unbounded_depth&quot;</span>)]
</span>disable_recursion_limit: bool,
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, R&gt; Deserializer&lt;R&gt;
<span class="kw">where
</span>R: read::Read&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="doccomment">/// Create a JSON deserializer from one of the possible serde_json input
/// sources.
///
/// Typically it is more convenient to use one of these methods instead:
///
/// - Deserializer::from_str
/// - Deserializer::from_slice
/// - Deserializer::from_reader
</span><span class="kw">pub fn </span>new(read: R) -&gt; <span class="self">Self </span>{
Deserializer {
read,
scratch: Vec::new(),
remaining_depth: <span class="number">128</span>,
<span class="attribute">#[cfg(feature = <span class="string">&quot;float_roundtrip&quot;</span>)]
</span>single_precision: <span class="bool-val">false</span>,
<span class="attribute">#[cfg(feature = <span class="string">&quot;unbounded_depth&quot;</span>)]
</span>disable_recursion_limit: <span class="bool-val">false</span>,
}
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="kw">impl</span>&lt;R&gt; Deserializer&lt;read::IoRead&lt;R&gt;&gt;
<span class="kw">where
</span>R: <span class="kw">crate</span>::io::Read,
{
<span class="doccomment">/// Creates a JSON deserializer from an `io::Read`.
///
/// Reader-based deserializers do not support deserializing borrowed types
/// like `&amp;str`, since the `std::io::Read` trait has no non-copying methods
/// -- everything it does involves copying bytes out of the data source.
</span><span class="kw">pub fn </span>from_reader(reader: R) -&gt; <span class="self">Self </span>{
Deserializer::new(read::IoRead::new(reader))
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Deserializer&lt;read::SliceRead&lt;<span class="lifetime">&#39;a</span>&gt;&gt; {
<span class="doccomment">/// Creates a JSON deserializer from a `&amp;[u8]`.
</span><span class="kw">pub fn </span>from_slice(bytes: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>[u8]) -&gt; <span class="self">Self </span>{
Deserializer::new(read::SliceRead::new(bytes))
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Deserializer&lt;read::StrRead&lt;<span class="lifetime">&#39;a</span>&gt;&gt; {
<span class="doccomment">/// Creates a JSON deserializer from a `&amp;str`.
</span><span class="kw">pub fn </span>from_str(s: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str) -&gt; <span class="self">Self </span>{
Deserializer::new(read::StrRead::new(s))
}
}
<span class="macro">macro_rules! </span>overflow {
(<span class="macro-nonterminal">$a</span>:ident * <span class="number">10 </span>+ <span class="macro-nonterminal">$b</span>:ident, <span class="macro-nonterminal">$c</span>:expr) =&gt; {
<span class="kw">match </span><span class="macro-nonterminal">$c </span>{
c =&gt; <span class="macro-nonterminal">$a </span>&gt;= c / <span class="number">10 </span>&amp;&amp; (<span class="macro-nonterminal">$a </span>&gt; c / <span class="number">10 </span>|| <span class="macro-nonterminal">$b </span>&gt; c % <span class="number">10</span>),
}
};
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>ParserNumber {
F64(f64),
U64(u64),
I64(i64),
<span class="attribute">#[cfg(feature = <span class="string">&quot;arbitrary_precision&quot;</span>)]
</span>String(String),
}
<span class="kw">impl </span>ParserNumber {
<span class="kw">fn </span>visit&lt;<span class="lifetime">&#39;de</span>, V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">match </span><span class="self">self </span>{
ParserNumber::F64(x) =&gt; visitor.visit_f64(x),
ParserNumber::U64(x) =&gt; visitor.visit_u64(x),
ParserNumber::I64(x) =&gt; visitor.visit_i64(x),
<span class="attribute">#[cfg(feature = <span class="string">&quot;arbitrary_precision&quot;</span>)]
</span>ParserNumber::String(x) =&gt; visitor.visit_map(NumberDeserializer { number: x.into() }),
}
}
<span class="kw">fn </span>invalid_type(<span class="self">self</span>, exp: <span class="kw-2">&amp;</span><span class="kw">dyn </span>Expected) -&gt; Error {
<span class="kw">match </span><span class="self">self </span>{
ParserNumber::F64(x) =&gt; de::Error::invalid_type(Unexpected::Float(x), exp),
ParserNumber::U64(x) =&gt; de::Error::invalid_type(Unexpected::Unsigned(x), exp),
ParserNumber::I64(x) =&gt; de::Error::invalid_type(Unexpected::Signed(x), exp),
<span class="attribute">#[cfg(feature = <span class="string">&quot;arbitrary_precision&quot;</span>)]
</span>ParserNumber::String(<span class="kw">_</span>) =&gt; de::Error::invalid_type(Unexpected::Other(<span class="string">&quot;number&quot;</span>), exp),
}
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, R: Read&lt;<span class="lifetime">&#39;de</span>&gt;&gt; Deserializer&lt;R&gt; {
<span class="doccomment">/// The `Deserializer::end` method should be called after a value has been fully deserialized.
/// This allows the `Deserializer` to validate that the input stream is at the end or that it
/// only has trailing whitespace.
</span><span class="kw">pub fn </span>end(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::TrailingCharacters)),
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Ok</span>(()),
}
}
<span class="doccomment">/// Turn a JSON deserializer into an iterator over values of type T.
</span><span class="kw">pub fn </span>into_iter&lt;T&gt;(<span class="self">self</span>) -&gt; StreamDeserializer&lt;<span class="lifetime">&#39;de</span>, R, T&gt;
<span class="kw">where
</span>T: de::Deserialize&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="comment">// This cannot be an implementation of std::iter::IntoIterator because
// we need the caller to choose what T is.
</span><span class="kw">let </span>offset = <span class="self">self</span>.read.byte_offset();
StreamDeserializer {
de: <span class="self">self</span>,
offset,
failed: <span class="bool-val">false</span>,
output: PhantomData,
lifetime: PhantomData,
}
}
<span class="doccomment">/// Parse arbitrarily deep JSON structures without any consideration for
/// overflowing the stack.
///
/// You will want to provide some other way to protect against stack
/// overflows, such as by wrapping your Deserializer in the dynamically
/// growing stack adapter provided by the serde_stacker crate. Additionally
/// you will need to be careful around other recursive operations on the
/// parsed result which may overflow the stack after deserialization has
/// completed, including, but not limited to, Display and Debug and Drop
/// impls.
///
/// *This method is only available if serde_json is built with the
/// `&quot;unbounded_depth&quot;` feature.*
///
/// # Examples
///
/// ```
/// use serde::Deserialize;
/// use serde_json::Value;
///
/// fn main() {
/// let mut json = String::new();
/// for _ in 0..10000 {
/// json = format!(&quot;[{}]&quot;, json);
/// }
///
/// let mut deserializer = serde_json::Deserializer::from_str(&amp;json);
/// deserializer.disable_recursion_limit();
/// let deserializer = serde_stacker::Deserializer::new(&amp;mut deserializer);
/// let value = Value::deserialize(deserializer).unwrap();
///
/// carefully_drop_nested_arrays(value);
/// }
///
/// fn carefully_drop_nested_arrays(value: Value) {
/// let mut stack = vec![value];
/// while let Some(value) = stack.pop() {
/// if let Value::Array(array) = value {
/// stack.extend(array);
/// }
/// }
/// }
/// ```
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;unbounded_depth&quot;</span>)]
#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;unbounded_depth&quot;</span>)))]
</span><span class="kw">pub fn </span>disable_recursion_limit(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
<span class="self">self</span>.disable_recursion_limit = <span class="bool-val">true</span>;
}
<span class="kw">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;u8&gt;&gt; {
<span class="self">self</span>.read.peek()
}
<span class="kw">fn </span>peek_or_null(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;u8&gt; {
<span class="prelude-val">Ok</span>(<span class="macro">tri!</span>(<span class="self">self</span>.peek()).unwrap_or(<span class="string">b&#39;\x00&#39;</span>))
}
<span class="kw">fn </span>eat_char(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
<span class="self">self</span>.read.discard();
}
<span class="kw">fn </span>next_char(<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;u8&gt;&gt; {
<span class="self">self</span>.read.next()
}
<span class="kw">fn </span>next_char_or_null(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;u8&gt; {
<span class="prelude-val">Ok</span>(<span class="macro">tri!</span>(<span class="self">self</span>.next_char()).unwrap_or(<span class="string">b&#39;\x00&#39;</span>))
}
<span class="doccomment">/// Error caused by a byte from next_char().
</span><span class="attribute">#[cold]
</span><span class="kw">fn </span>error(<span class="kw-2">&amp;</span><span class="self">self</span>, reason: ErrorCode) -&gt; Error {
<span class="kw">let </span>position = <span class="self">self</span>.read.position();
Error::syntax(reason, position.line, position.column)
}
<span class="doccomment">/// Error caused by a byte from peek().
</span><span class="attribute">#[cold]
</span><span class="kw">fn </span>peek_error(<span class="kw-2">&amp;</span><span class="self">self</span>, reason: ErrorCode) -&gt; Error {
<span class="kw">let </span>position = <span class="self">self</span>.read.peek_position();
Error::syntax(reason, position.line, position.column)
}
<span class="doccomment">/// Returns the first non-whitespace byte without consuming it, or `None` if
/// EOF is encountered.
</span><span class="kw">fn </span>parse_whitespace(<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;u8&gt;&gt; {
<span class="kw">loop </span>{
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39; &#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">b&#39;\n&#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">b&#39;\t&#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">b&#39;\r&#39;</span>) =&gt; {
<span class="self">self</span>.eat_char();
}
other =&gt; {
<span class="kw">return </span><span class="prelude-val">Ok</span>(other);
}
}
}
}
<span class="attribute">#[cold]
</span><span class="kw">fn </span>peek_invalid_type(<span class="kw-2">&amp;mut </span><span class="self">self</span>, exp: <span class="kw-2">&amp;</span><span class="kw">dyn </span>Expected) -&gt; Error {
<span class="kw">let </span>err = <span class="kw">match </span><span class="self">self</span>.peek_or_null().unwrap_or(<span class="string">b&#39;\x00&#39;</span>) {
<span class="string">b&#39;n&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="kw">if let </span><span class="prelude-val">Err</span>(err) = <span class="self">self</span>.parse_ident(<span class="string">b&quot;ull&quot;</span>) {
<span class="kw">return </span>err;
}
de::Error::invalid_type(Unexpected::Unit, exp)
}
<span class="string">b&#39;t&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="kw">if let </span><span class="prelude-val">Err</span>(err) = <span class="self">self</span>.parse_ident(<span class="string">b&quot;rue&quot;</span>) {
<span class="kw">return </span>err;
}
de::Error::invalid_type(Unexpected::Bool(<span class="bool-val">true</span>), exp)
}
<span class="string">b&#39;f&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="kw">if let </span><span class="prelude-val">Err</span>(err) = <span class="self">self</span>.parse_ident(<span class="string">b&quot;alse&quot;</span>) {
<span class="kw">return </span>err;
}
de::Error::invalid_type(Unexpected::Bool(<span class="bool-val">false</span>), exp)
}
<span class="string">b&#39;-&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="kw">match </span><span class="self">self</span>.parse_any_number(<span class="bool-val">false</span>) {
<span class="prelude-val">Ok</span>(n) =&gt; n.invalid_type(exp),
<span class="prelude-val">Err</span>(err) =&gt; <span class="kw">return </span>err,
}
}
<span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; <span class="kw">match </span><span class="self">self</span>.parse_any_number(<span class="bool-val">true</span>) {
<span class="prelude-val">Ok</span>(n) =&gt; n.invalid_type(exp),
<span class="prelude-val">Err</span>(err) =&gt; <span class="kw">return </span>err,
},
<span class="string">b&#39;&quot;&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="self">self</span>.scratch.clear();
<span class="kw">match </span><span class="self">self</span>.read.parse_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>.scratch) {
<span class="prelude-val">Ok</span>(s) =&gt; de::Error::invalid_type(Unexpected::Str(<span class="kw-2">&amp;</span>s), exp),
<span class="prelude-val">Err</span>(err) =&gt; <span class="kw">return </span>err,
}
}
<span class="string">b&#39;[&#39; </span>=&gt; de::Error::invalid_type(Unexpected::Seq, exp),
<span class="string">b&#39;{&#39; </span>=&gt; de::Error::invalid_type(Unexpected::Map, exp),
<span class="kw">_ </span>=&gt; <span class="self">self</span>.peek_error(ErrorCode::ExpectedSomeValue),
};
<span class="self">self</span>.fix_position(err)
}
<span class="kw">fn </span>deserialize_number&lt;V&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span>peek = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue));
}
};
<span class="kw">let </span>value = <span class="kw">match </span>peek {
<span class="string">b&#39;-&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.parse_integer(<span class="bool-val">false</span>)).visit(visitor)
}
<span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; <span class="macro">tri!</span>(<span class="self">self</span>.parse_integer(<span class="bool-val">true</span>)).visit(visitor),
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&amp;</span>visitor)),
};
<span class="kw">match </span>value {
<span class="prelude-val">Ok</span>(value) =&gt; <span class="prelude-val">Ok</span>(value),
<span class="prelude-val">Err</span>(err) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)),
}
}
<span class="kw">fn </span>scan_integer128(<span class="kw-2">&amp;mut </span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>String) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.next_char_or_null()) {
<span class="string">b&#39;0&#39; </span>=&gt; {
buf.push(<span class="string">&#39;0&#39;</span>);
<span class="comment">// There can be only one leading &#39;0&#39;.
</span><span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber)),
<span class="kw">_ </span>=&gt; <span class="prelude-val">Ok</span>(()),
}
}
c @ <span class="string">b&#39;1&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; {
buf.push(c <span class="kw">as </span>char);
<span class="kw">while let </span>c @ <span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>= <span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="self">self</span>.eat_char();
buf.push(c <span class="kw">as </span>char);
}
<span class="prelude-val">Ok</span>(())
}
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::InvalidNumber)),
}
}
<span class="attribute">#[cold]
</span><span class="kw">fn </span>fix_position(<span class="kw-2">&amp;</span><span class="self">self</span>, err: Error) -&gt; Error {
err.fix_position(<span class="kw">move </span>|code| <span class="self">self</span>.error(code))
}
<span class="kw">fn </span>parse_ident(<span class="kw-2">&amp;mut </span><span class="self">self</span>, ident: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">for </span>expected <span class="kw">in </span>ident {
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.next_char()) {
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::EofWhileParsingValue));
}
<span class="prelude-val">Some</span>(next) =&gt; {
<span class="kw">if </span>next != <span class="kw-2">*</span>expected {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::ExpectedSomeIdent));
}
}
}
}
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn </span>parse_integer(<span class="kw-2">&amp;mut </span><span class="self">self</span>, positive: bool) -&gt; <span class="prelude-ty">Result</span>&lt;ParserNumber&gt; {
<span class="kw">let </span>next = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.next_char()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::EofWhileParsingValue));
}
};
<span class="kw">match </span>next {
<span class="string">b&#39;0&#39; </span>=&gt; {
<span class="comment">// There can be only one leading &#39;0&#39;.
</span><span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber)),
<span class="kw">_ </span>=&gt; <span class="self">self</span>.parse_number(positive, <span class="number">0</span>),
}
}
c @ <span class="string">b&#39;1&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>significand = (c - <span class="string">b&#39;0&#39;</span>) <span class="kw">as </span>u64;
<span class="kw">loop </span>{
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
c @ <span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; {
<span class="kw">let </span>digit = (c - <span class="string">b&#39;0&#39;</span>) <span class="kw">as </span>u64;
<span class="comment">// We need to be careful with overflow. If we can,
// try to keep the number as a `u64` until we grow
// too large. At that point, switch to parsing the
// value as a `f64`.
</span><span class="kw">if </span><span class="macro">overflow!</span>(significand * <span class="number">10 </span>+ digit, u64::max_value()) {
<span class="kw">return </span><span class="prelude-val">Ok</span>(ParserNumber::F64(<span class="macro">tri!</span>(
<span class="self">self</span>.parse_long_integer(positive, significand),
)));
}
<span class="self">self</span>.eat_char();
significand = significand * <span class="number">10 </span>+ digit;
}
<span class="kw">_ </span>=&gt; {
<span class="kw">return </span><span class="self">self</span>.parse_number(positive, significand);
}
}
}
}
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::InvalidNumber)),
}
}
<span class="kw">fn </span>parse_number(<span class="kw-2">&amp;mut </span><span class="self">self</span>, positive: bool, significand: u64) -&gt; <span class="prelude-ty">Result</span>&lt;ParserNumber&gt; {
<span class="prelude-val">Ok</span>(<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;.&#39; </span>=&gt; ParserNumber::F64(<span class="macro">tri!</span>(<span class="self">self</span>.parse_decimal(positive, significand, <span class="number">0</span>))),
<span class="string">b&#39;e&#39; </span>| <span class="string">b&#39;E&#39; </span>=&gt; ParserNumber::F64(<span class="macro">tri!</span>(<span class="self">self</span>.parse_exponent(positive, significand, <span class="number">0</span>))),
<span class="kw">_ </span>=&gt; {
<span class="kw">if </span>positive {
ParserNumber::U64(significand)
} <span class="kw">else </span>{
<span class="kw">let </span>neg = (significand <span class="kw">as </span>i64).wrapping_neg();
<span class="comment">// Convert into a float if we underflow, or on `-0`.
</span><span class="kw">if </span>neg &gt;= <span class="number">0 </span>{
ParserNumber::F64(-(significand <span class="kw">as </span>f64))
} <span class="kw">else </span>{
ParserNumber::I64(neg)
}
}
}
})
}
<span class="kw">fn </span>parse_decimal(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
positive: bool,
<span class="kw-2">mut </span>significand: u64,
exponent_before_decimal_point: i32,
) -&gt; <span class="prelude-ty">Result</span>&lt;f64&gt; {
<span class="self">self</span>.eat_char();
<span class="kw">let </span><span class="kw-2">mut </span>exponent_after_decimal_point = <span class="number">0</span>;
<span class="kw">while let </span>c @ <span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>= <span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="kw">let </span>digit = (c - <span class="string">b&#39;0&#39;</span>) <span class="kw">as </span>u64;
<span class="kw">if </span><span class="macro">overflow!</span>(significand * <span class="number">10 </span>+ digit, u64::max_value()) {
<span class="kw">let </span>exponent = exponent_before_decimal_point + exponent_after_decimal_point;
<span class="kw">return </span><span class="self">self</span>.parse_decimal_overflow(positive, significand, exponent);
}
<span class="self">self</span>.eat_char();
significand = significand * <span class="number">10 </span>+ digit;
exponent_after_decimal_point -= <span class="number">1</span>;
}
<span class="comment">// Error if there is not at least one digit after the decimal point.
</span><span class="kw">if </span>exponent_after_decimal_point == <span class="number">0 </span>{
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek()) {
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber)),
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue)),
}
}
<span class="kw">let </span>exponent = exponent_before_decimal_point + exponent_after_decimal_point;
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;e&#39; </span>| <span class="string">b&#39;E&#39; </span>=&gt; <span class="self">self</span>.parse_exponent(positive, significand, exponent),
<span class="kw">_ </span>=&gt; <span class="self">self</span>.f64_from_parts(positive, significand, exponent),
}
}
<span class="kw">fn </span>parse_exponent(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
positive: bool,
significand: u64,
starting_exp: i32,
) -&gt; <span class="prelude-ty">Result</span>&lt;f64&gt; {
<span class="self">self</span>.eat_char();
<span class="kw">let </span>positive_exp = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;+&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="bool-val">true
</span>}
<span class="string">b&#39;-&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="bool-val">false
</span>}
<span class="kw">_ </span>=&gt; <span class="bool-val">true</span>,
};
<span class="kw">let </span>next = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.next_char()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::EofWhileParsingValue));
}
};
<span class="comment">// Make sure a digit follows the exponent place.
</span><span class="kw">let </span><span class="kw-2">mut </span>exp = <span class="kw">match </span>next {
c @ <span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; (c - <span class="string">b&#39;0&#39;</span>) <span class="kw">as </span>i32,
<span class="kw">_ </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::InvalidNumber));
}
};
<span class="kw">while let </span>c @ <span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>= <span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="self">self</span>.eat_char();
<span class="kw">let </span>digit = (c - <span class="string">b&#39;0&#39;</span>) <span class="kw">as </span>i32;
<span class="kw">if </span><span class="macro">overflow!</span>(exp * <span class="number">10 </span>+ digit, i32::max_value()) {
<span class="kw">let </span>zero_significand = significand == <span class="number">0</span>;
<span class="kw">return </span><span class="self">self</span>.parse_exponent_overflow(positive, zero_significand, positive_exp);
}
exp = exp * <span class="number">10 </span>+ digit;
}
<span class="kw">let </span>final_exp = <span class="kw">if </span>positive_exp {
starting_exp.saturating_add(exp)
} <span class="kw">else </span>{
starting_exp.saturating_sub(exp)
};
<span class="self">self</span>.f64_from_parts(positive, significand, final_exp)
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;float_roundtrip&quot;</span>)]
</span><span class="kw">fn </span>f64_from_parts(<span class="kw-2">&amp;mut </span><span class="self">self</span>, positive: bool, significand: u64, exponent: i32) -&gt; <span class="prelude-ty">Result</span>&lt;f64&gt; {
<span class="kw">let </span>f = <span class="kw">if </span><span class="self">self</span>.single_precision {
lexical::parse_concise_float::&lt;f32&gt;(significand, exponent) <span class="kw">as </span>f64
} <span class="kw">else </span>{
lexical::parse_concise_float::&lt;f64&gt;(significand, exponent)
};
<span class="kw">if </span>f.is_infinite() {
<span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::NumberOutOfRange))
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>(<span class="kw">if </span>positive { f } <span class="kw">else </span>{ -f })
}
}
<span class="attribute">#[cfg(not(feature = <span class="string">&quot;float_roundtrip&quot;</span>))]
</span><span class="kw">fn </span>f64_from_parts(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
positive: bool,
significand: u64,
<span class="kw-2">mut </span>exponent: i32,
) -&gt; <span class="prelude-ty">Result</span>&lt;f64&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>f = significand <span class="kw">as </span>f64;
<span class="kw">loop </span>{
<span class="kw">match </span>POW10.get(exponent.wrapping_abs() <span class="kw">as </span>usize) {
<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>pow) =&gt; {
<span class="kw">if </span>exponent &gt;= <span class="number">0 </span>{
f <span class="kw-2">*</span>= pow;
<span class="kw">if </span>f.is_infinite() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::NumberOutOfRange));
}
} <span class="kw">else </span>{
f /= pow;
}
<span class="kw">break</span>;
}
<span class="prelude-val">None </span>=&gt; {
<span class="kw">if </span>f == <span class="number">0.0 </span>{
<span class="kw">break</span>;
}
<span class="kw">if </span>exponent &gt;= <span class="number">0 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::NumberOutOfRange));
}
f /= <span class="number">1e308</span>;
exponent += <span class="number">308</span>;
}
}
}
<span class="prelude-val">Ok</span>(<span class="kw">if </span>positive { f } <span class="kw">else </span>{ -f })
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;float_roundtrip&quot;</span>)]
#[cold]
#[inline(never)]
</span><span class="kw">fn </span>parse_long_integer(<span class="kw-2">&amp;mut </span><span class="self">self</span>, positive: bool, partial_significand: u64) -&gt; <span class="prelude-ty">Result</span>&lt;f64&gt; {
<span class="comment">// To deserialize floats we&#39;ll first push the integer and fraction
// parts, both as byte strings, into the scratch buffer and then feed
// both slices to lexical&#39;s parser. For example if the input is
// `12.34e5` we&#39;ll push b&quot;1234&quot; into scratch and then pass b&quot;12&quot; and
// b&quot;34&quot; to lexical. `integer_end` will be used to track where to split
// the scratch buffer.
//
// Note that lexical expects the integer part to contain *no* leading
// zeroes and the fraction part to contain *no* trailing zeroes. The
// first requirement is already handled by the integer parsing logic.
// The second requirement will be enforced just before passing the
// slices to lexical in f64_long_from_parts.
</span><span class="self">self</span>.scratch.clear();
<span class="self">self</span>.scratch
.extend_from_slice(itoa::Buffer::new().format(partial_significand).as_bytes());
<span class="kw">loop </span>{
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
c @ <span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; {
<span class="self">self</span>.scratch.push(c);
<span class="self">self</span>.eat_char();
}
<span class="string">b&#39;.&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="kw">return </span><span class="self">self</span>.parse_long_decimal(positive, <span class="self">self</span>.scratch.len());
}
<span class="string">b&#39;e&#39; </span>| <span class="string">b&#39;E&#39; </span>=&gt; {
<span class="kw">return </span><span class="self">self</span>.parse_long_exponent(positive, <span class="self">self</span>.scratch.len());
}
<span class="kw">_ </span>=&gt; {
<span class="kw">return </span><span class="self">self</span>.f64_long_from_parts(positive, <span class="self">self</span>.scratch.len(), <span class="number">0</span>);
}
}
}
}
<span class="attribute">#[cfg(not(feature = <span class="string">&quot;float_roundtrip&quot;</span>))]
#[cold]
#[inline(never)]
</span><span class="kw">fn </span>parse_long_integer(<span class="kw-2">&amp;mut </span><span class="self">self</span>, positive: bool, significand: u64) -&gt; <span class="prelude-ty">Result</span>&lt;f64&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>exponent = <span class="number">0</span>;
<span class="kw">loop </span>{
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="comment">// This could overflow... if your integer is gigabytes long.
// Ignore that possibility.
</span>exponent += <span class="number">1</span>;
}
<span class="string">b&#39;.&#39; </span>=&gt; {
<span class="kw">return </span><span class="self">self</span>.parse_decimal(positive, significand, exponent);
}
<span class="string">b&#39;e&#39; </span>| <span class="string">b&#39;E&#39; </span>=&gt; {
<span class="kw">return </span><span class="self">self</span>.parse_exponent(positive, significand, exponent);
}
<span class="kw">_ </span>=&gt; {
<span class="kw">return </span><span class="self">self</span>.f64_from_parts(positive, significand, exponent);
}
}
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;float_roundtrip&quot;</span>)]
#[cold]
</span><span class="kw">fn </span>parse_long_decimal(<span class="kw-2">&amp;mut </span><span class="self">self</span>, positive: bool, integer_end: usize) -&gt; <span class="prelude-ty">Result</span>&lt;f64&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>at_least_one_digit = integer_end &lt; <span class="self">self</span>.scratch.len();
<span class="kw">while let </span>c @ <span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>= <span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="self">self</span>.scratch.push(c);
<span class="self">self</span>.eat_char();
at_least_one_digit = <span class="bool-val">true</span>;
}
<span class="kw">if </span>!at_least_one_digit {
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek()) {
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber)),
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue)),
}
}
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;e&#39; </span>| <span class="string">b&#39;E&#39; </span>=&gt; <span class="self">self</span>.parse_long_exponent(positive, integer_end),
<span class="kw">_ </span>=&gt; <span class="self">self</span>.f64_long_from_parts(positive, integer_end, <span class="number">0</span>),
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;float_roundtrip&quot;</span>)]
</span><span class="kw">fn </span>parse_long_exponent(<span class="kw-2">&amp;mut </span><span class="self">self</span>, positive: bool, integer_end: usize) -&gt; <span class="prelude-ty">Result</span>&lt;f64&gt; {
<span class="self">self</span>.eat_char();
<span class="kw">let </span>positive_exp = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;+&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="bool-val">true
</span>}
<span class="string">b&#39;-&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="bool-val">false
</span>}
<span class="kw">_ </span>=&gt; <span class="bool-val">true</span>,
};
<span class="kw">let </span>next = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.next_char()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::EofWhileParsingValue));
}
};
<span class="comment">// Make sure a digit follows the exponent place.
</span><span class="kw">let </span><span class="kw-2">mut </span>exp = <span class="kw">match </span>next {
c @ <span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; (c - <span class="string">b&#39;0&#39;</span>) <span class="kw">as </span>i32,
<span class="kw">_ </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::InvalidNumber));
}
};
<span class="kw">while let </span>c @ <span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>= <span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="self">self</span>.eat_char();
<span class="kw">let </span>digit = (c - <span class="string">b&#39;0&#39;</span>) <span class="kw">as </span>i32;
<span class="kw">if </span><span class="macro">overflow!</span>(exp * <span class="number">10 </span>+ digit, i32::max_value()) {
<span class="kw">let </span>zero_significand = <span class="self">self</span>.scratch.iter().all(|<span class="kw-2">&amp;</span>digit| digit == <span class="string">b&#39;0&#39;</span>);
<span class="kw">return </span><span class="self">self</span>.parse_exponent_overflow(positive, zero_significand, positive_exp);
}
exp = exp * <span class="number">10 </span>+ digit;
}
<span class="kw">let </span>final_exp = <span class="kw">if </span>positive_exp { exp } <span class="kw">else </span>{ -exp };
<span class="self">self</span>.f64_long_from_parts(positive, integer_end, final_exp)
}
<span class="comment">// This cold code should not be inlined into the middle of the hot
// decimal-parsing loop above.
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;float_roundtrip&quot;</span>)]
#[cold]
#[inline(never)]
</span><span class="kw">fn </span>parse_decimal_overflow(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
positive: bool,
significand: u64,
exponent: i32,
) -&gt; <span class="prelude-ty">Result</span>&lt;f64&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>buffer = itoa::Buffer::new();
<span class="kw">let </span>significand = buffer.format(significand);
<span class="kw">let </span>fraction_digits = -exponent <span class="kw">as </span>usize;
<span class="self">self</span>.scratch.clear();
<span class="kw">if let </span><span class="prelude-val">Some</span>(zeros) = fraction_digits.checked_sub(significand.len() + <span class="number">1</span>) {
<span class="self">self</span>.scratch.extend(iter::repeat(<span class="string">b&#39;0&#39;</span>).take(zeros + <span class="number">1</span>));
}
<span class="self">self</span>.scratch.extend_from_slice(significand.as_bytes());
<span class="kw">let </span>integer_end = <span class="self">self</span>.scratch.len() - fraction_digits;
<span class="self">self</span>.parse_long_decimal(positive, integer_end)
}
<span class="attribute">#[cfg(not(feature = <span class="string">&quot;float_roundtrip&quot;</span>))]
#[cold]
#[inline(never)]
</span><span class="kw">fn </span>parse_decimal_overflow(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
positive: bool,
significand: u64,
exponent: i32,
) -&gt; <span class="prelude-ty">Result</span>&lt;f64&gt; {
<span class="comment">// The next multiply/add would overflow, so just ignore all further
// digits.
</span><span class="kw">while let </span><span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>= <span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="self">self</span>.eat_char();
}
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;e&#39; </span>| <span class="string">b&#39;E&#39; </span>=&gt; <span class="self">self</span>.parse_exponent(positive, significand, exponent),
<span class="kw">_ </span>=&gt; <span class="self">self</span>.f64_from_parts(positive, significand, exponent),
}
}
<span class="comment">// This cold code should not be inlined into the middle of the hot
// exponent-parsing loop above.
</span><span class="attribute">#[cold]
#[inline(never)]
</span><span class="kw">fn </span>parse_exponent_overflow(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
positive: bool,
zero_significand: bool,
positive_exp: bool,
) -&gt; <span class="prelude-ty">Result</span>&lt;f64&gt; {
<span class="comment">// Error instead of +/- infinity.
</span><span class="kw">if </span>!zero_significand &amp;&amp; positive_exp {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::NumberOutOfRange));
}
<span class="kw">while let </span><span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>= <span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="self">self</span>.eat_char();
}
<span class="prelude-val">Ok</span>(<span class="kw">if </span>positive { <span class="number">0.0 </span>} <span class="kw">else </span>{ -<span class="number">0.0 </span>})
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;float_roundtrip&quot;</span>)]
</span><span class="kw">fn </span>f64_long_from_parts(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
positive: bool,
integer_end: usize,
exponent: i32,
) -&gt; <span class="prelude-ty">Result</span>&lt;f64&gt; {
<span class="kw">let </span>integer = <span class="kw-2">&amp;</span><span class="self">self</span>.scratch[..integer_end];
<span class="kw">let </span>fraction = <span class="kw-2">&amp;</span><span class="self">self</span>.scratch[integer_end..];
<span class="kw">let </span>f = <span class="kw">if </span><span class="self">self</span>.single_precision {
lexical::parse_truncated_float::&lt;f32&gt;(integer, fraction, exponent) <span class="kw">as </span>f64
} <span class="kw">else </span>{
lexical::parse_truncated_float::&lt;f64&gt;(integer, fraction, exponent)
};
<span class="kw">if </span>f.is_infinite() {
<span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::NumberOutOfRange))
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>(<span class="kw">if </span>positive { f } <span class="kw">else </span>{ -f })
}
}
<span class="kw">fn </span>parse_any_signed_number(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;ParserNumber&gt; {
<span class="kw">let </span>peek = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue));
}
};
<span class="kw">let </span>value = <span class="kw">match </span>peek {
<span class="string">b&#39;-&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="self">self</span>.parse_any_number(<span class="bool-val">false</span>)
}
<span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; <span class="self">self</span>.parse_any_number(<span class="bool-val">true</span>),
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber)),
};
<span class="kw">let </span>value = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek()) {
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber)),
<span class="prelude-val">None </span>=&gt; value,
};
<span class="kw">match </span>value {
<span class="prelude-val">Ok</span>(value) =&gt; <span class="prelude-val">Ok</span>(value),
<span class="comment">// The de::Error impl creates errors with unknown line and column.
// Fill in the position here by looking at the current index in the
// input. There is no way to tell whether this should call `error`
// or `peek_error` so pick the one that seems correct more often.
// Worst case, the position is off by one character.
</span><span class="prelude-val">Err</span>(err) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)),
}
}
<span class="attribute">#[cfg(not(feature = <span class="string">&quot;arbitrary_precision&quot;</span>))]
</span><span class="kw">fn </span>parse_any_number(<span class="kw-2">&amp;mut </span><span class="self">self</span>, positive: bool) -&gt; <span class="prelude-ty">Result</span>&lt;ParserNumber&gt; {
<span class="self">self</span>.parse_integer(positive)
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;arbitrary_precision&quot;</span>)]
</span><span class="kw">fn </span>parse_any_number(<span class="kw-2">&amp;mut </span><span class="self">self</span>, positive: bool) -&gt; <span class="prelude-ty">Result</span>&lt;ParserNumber&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>buf = String::with_capacity(<span class="number">16</span>);
<span class="kw">if </span>!positive {
buf.push(<span class="string">&#39;-&#39;</span>);
}
<span class="self">self</span>.scan_integer(<span class="kw-2">&amp;mut </span>buf)<span class="question-mark">?</span>;
<span class="kw">if </span>positive {
<span class="kw">if let </span><span class="prelude-val">Ok</span>(unsigned) = buf.parse() {
<span class="kw">return </span><span class="prelude-val">Ok</span>(ParserNumber::U64(unsigned));
}
} <span class="kw">else </span>{
<span class="kw">if let </span><span class="prelude-val">Ok</span>(signed) = buf.parse() {
<span class="kw">return </span><span class="prelude-val">Ok</span>(ParserNumber::I64(signed));
}
}
<span class="prelude-val">Ok</span>(ParserNumber::String(buf))
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;arbitrary_precision&quot;</span>)]
</span><span class="kw">fn </span>scan_or_eof(<span class="kw-2">&amp;mut </span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>String) -&gt; <span class="prelude-ty">Result</span>&lt;u8&gt; {
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.next_char()) {
<span class="prelude-val">Some</span>(b) =&gt; {
buf.push(b <span class="kw">as </span>char);
<span class="prelude-val">Ok</span>(b)
}
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::EofWhileParsingValue)),
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;arbitrary_precision&quot;</span>)]
</span><span class="kw">fn </span>scan_integer(<span class="kw-2">&amp;mut </span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>String) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.scan_or_eof(buf)) {
<span class="string">b&#39;0&#39; </span>=&gt; {
<span class="comment">// There can be only one leading &#39;0&#39;.
</span><span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber)),
<span class="kw">_ </span>=&gt; <span class="self">self</span>.scan_number(buf),
}
}
<span class="string">b&#39;1&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; <span class="kw">loop </span>{
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
c @ <span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
buf.push(c <span class="kw">as </span>char);
}
<span class="kw">_ </span>=&gt; {
<span class="kw">return </span><span class="self">self</span>.scan_number(buf);
}
}
},
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::InvalidNumber)),
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;arbitrary_precision&quot;</span>)]
</span><span class="kw">fn </span>scan_number(<span class="kw-2">&amp;mut </span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>String) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;.&#39; </span>=&gt; <span class="self">self</span>.scan_decimal(buf),
e @ <span class="string">b&#39;e&#39; </span>| e @ <span class="string">b&#39;E&#39; </span>=&gt; <span class="self">self</span>.scan_exponent(e <span class="kw">as </span>char, buf),
<span class="kw">_ </span>=&gt; <span class="prelude-val">Ok</span>(()),
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;arbitrary_precision&quot;</span>)]
</span><span class="kw">fn </span>scan_decimal(<span class="kw-2">&amp;mut </span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>String) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="self">self</span>.eat_char();
buf.push(<span class="string">&#39;.&#39;</span>);
<span class="kw">let </span><span class="kw-2">mut </span>at_least_one_digit = <span class="bool-val">false</span>;
<span class="kw">while let </span>c @ <span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>= <span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="self">self</span>.eat_char();
buf.push(c <span class="kw">as </span>char);
at_least_one_digit = <span class="bool-val">true</span>;
}
<span class="kw">if </span>!at_least_one_digit {
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek()) {
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber)),
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue)),
}
}
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
e @ <span class="string">b&#39;e&#39; </span>| e @ <span class="string">b&#39;E&#39; </span>=&gt; <span class="self">self</span>.scan_exponent(e <span class="kw">as </span>char, buf),
<span class="kw">_ </span>=&gt; <span class="prelude-val">Ok</span>(()),
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;arbitrary_precision&quot;</span>)]
</span><span class="kw">fn </span>scan_exponent(<span class="kw-2">&amp;mut </span><span class="self">self</span>, e: char, buf: <span class="kw-2">&amp;mut </span>String) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="self">self</span>.eat_char();
buf.push(e);
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;+&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
buf.push(<span class="string">&#39;+&#39;</span>);
}
<span class="string">b&#39;-&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
buf.push(<span class="string">&#39;-&#39;</span>);
}
<span class="kw">_ </span>=&gt; {}
}
<span class="comment">// Make sure a digit follows the exponent place.
</span><span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.scan_or_eof(buf)) {
<span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; {}
<span class="kw">_ </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::InvalidNumber));
}
}
<span class="kw">while let </span>c @ <span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>= <span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="self">self</span>.eat_char();
buf.push(c <span class="kw">as </span>char);
}
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn </span>parse_object_colon(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39;:&#39;</span>) =&gt; {
<span class="self">self</span>.eat_char();
<span class="prelude-val">Ok</span>(())
}
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::ExpectedColon)),
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingObject)),
}
}
<span class="kw">fn </span>end_seq(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39;]&#39;</span>) =&gt; {
<span class="self">self</span>.eat_char();
<span class="prelude-val">Ok</span>(())
}
<span class="prelude-val">Some</span>(<span class="string">b&#39;,&#39;</span>) =&gt; {
<span class="self">self</span>.eat_char();
<span class="kw">match </span><span class="self">self</span>.parse_whitespace() {
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="string">b&#39;]&#39;</span>)) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::TrailingComma)),
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::TrailingCharacters)),
}
}
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::TrailingCharacters)),
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingList)),
}
}
<span class="kw">fn </span>end_map(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39;}&#39;</span>) =&gt; {
<span class="self">self</span>.eat_char();
<span class="prelude-val">Ok</span>(())
}
<span class="prelude-val">Some</span>(<span class="string">b&#39;,&#39;</span>) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::TrailingComma)),
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::TrailingCharacters)),
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingObject)),
}
}
<span class="kw">fn </span>ignore_value(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="self">self</span>.scratch.clear();
<span class="kw">let </span><span class="kw-2">mut </span>enclosing = <span class="prelude-val">None</span>;
<span class="kw">loop </span>{
<span class="kw">let </span>peek = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue));
}
};
<span class="kw">let </span>frame = <span class="kw">match </span>peek {
<span class="string">b&#39;n&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b&quot;ull&quot;</span>));
<span class="prelude-val">None
</span>}
<span class="string">b&#39;t&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b&quot;rue&quot;</span>));
<span class="prelude-val">None
</span>}
<span class="string">b&#39;f&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b&quot;alse&quot;</span>));
<span class="prelude-val">None
</span>}
<span class="string">b&#39;-&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.ignore_integer());
<span class="prelude-val">None
</span>}
<span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; {
<span class="macro">tri!</span>(<span class="self">self</span>.ignore_integer());
<span class="prelude-val">None
</span>}
<span class="string">b&#39;&quot;&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.read.ignore_str());
<span class="prelude-val">None
</span>}
frame @ <span class="string">b&#39;[&#39; </span>| frame @ <span class="string">b&#39;{&#39; </span>=&gt; {
<span class="self">self</span>.scratch.extend(enclosing.take());
<span class="self">self</span>.eat_char();
<span class="prelude-val">Some</span>(frame)
}
<span class="kw">_ </span>=&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::ExpectedSomeValue)),
};
<span class="kw">let </span>(<span class="kw-2">mut </span>accept_comma, <span class="kw-2">mut </span>frame) = <span class="kw">match </span>frame {
<span class="prelude-val">Some</span>(frame) =&gt; (<span class="bool-val">false</span>, frame),
<span class="prelude-val">None </span>=&gt; <span class="kw">match </span>enclosing.take() {
<span class="prelude-val">Some</span>(frame) =&gt; (<span class="bool-val">true</span>, frame),
<span class="prelude-val">None </span>=&gt; <span class="kw">match </span><span class="self">self</span>.scratch.pop() {
<span class="prelude-val">Some</span>(frame) =&gt; (<span class="bool-val">true</span>, frame),
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Ok</span>(()),
},
},
};
<span class="kw">loop </span>{
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39;,&#39;</span>) <span class="kw">if </span>accept_comma =&gt; {
<span class="self">self</span>.eat_char();
<span class="kw">break</span>;
}
<span class="prelude-val">Some</span>(<span class="string">b&#39;]&#39;</span>) <span class="kw">if </span>frame == <span class="string">b&#39;[&#39; </span>=&gt; {}
<span class="prelude-val">Some</span>(<span class="string">b&#39;}&#39;</span>) <span class="kw">if </span>frame == <span class="string">b&#39;{&#39; </span>=&gt; {}
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; {
<span class="kw">if </span>accept_comma {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(<span class="kw">match </span>frame {
<span class="string">b&#39;[&#39; </span>=&gt; ErrorCode::ExpectedListCommaOrEnd,
<span class="string">b&#39;{&#39; </span>=&gt; ErrorCode::ExpectedObjectCommaOrEnd,
<span class="kw">_ </span>=&gt; <span class="macro">unreachable!</span>(),
}));
} <span class="kw">else </span>{
<span class="kw">break</span>;
}
}
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(<span class="kw">match </span>frame {
<span class="string">b&#39;[&#39; </span>=&gt; ErrorCode::EofWhileParsingList,
<span class="string">b&#39;{&#39; </span>=&gt; ErrorCode::EofWhileParsingObject,
<span class="kw">_ </span>=&gt; <span class="macro">unreachable!</span>(),
}));
}
}
<span class="self">self</span>.eat_char();
frame = <span class="kw">match </span><span class="self">self</span>.scratch.pop() {
<span class="prelude-val">Some</span>(frame) =&gt; frame,
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Ok</span>(()),
};
accept_comma = <span class="bool-val">true</span>;
}
<span class="kw">if </span>frame == <span class="string">b&#39;{&#39; </span>{
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39;&quot;&#39;</span>) =&gt; <span class="self">self</span>.eat_char(),
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::KeyMustBeAString)),
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingObject)),
}
<span class="macro">tri!</span>(<span class="self">self</span>.read.ignore_str());
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39;:&#39;</span>) =&gt; <span class="self">self</span>.eat_char(),
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::ExpectedColon)),
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingObject)),
}
}
enclosing = <span class="prelude-val">Some</span>(frame);
}
}
<span class="kw">fn </span>ignore_integer(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.next_char_or_null()) {
<span class="string">b&#39;0&#39; </span>=&gt; {
<span class="comment">// There can be only one leading &#39;0&#39;.
</span><span class="kw">if let </span><span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>= <span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber));
}
}
<span class="string">b&#39;1&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; {
<span class="kw">while let </span><span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>= <span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="self">self</span>.eat_char();
}
}
<span class="kw">_ </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::InvalidNumber));
}
}
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;.&#39; </span>=&gt; <span class="self">self</span>.ignore_decimal(),
<span class="string">b&#39;e&#39; </span>| <span class="string">b&#39;E&#39; </span>=&gt; <span class="self">self</span>.ignore_exponent(),
<span class="kw">_ </span>=&gt; <span class="prelude-val">Ok</span>(()),
}
}
<span class="kw">fn </span>ignore_decimal(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="self">self</span>.eat_char();
<span class="kw">let </span><span class="kw-2">mut </span>at_least_one_digit = <span class="bool-val">false</span>;
<span class="kw">while let </span><span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>= <span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="self">self</span>.eat_char();
at_least_one_digit = <span class="bool-val">true</span>;
}
<span class="kw">if </span>!at_least_one_digit {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber));
}
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;e&#39; </span>| <span class="string">b&#39;E&#39; </span>=&gt; <span class="self">self</span>.ignore_exponent(),
<span class="kw">_ </span>=&gt; <span class="prelude-val">Ok</span>(()),
}
}
<span class="kw">fn </span>ignore_exponent(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="self">self</span>.eat_char();
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="string">b&#39;+&#39; </span>| <span class="string">b&#39;-&#39; </span>=&gt; <span class="self">self</span>.eat_char(),
<span class="kw">_ </span>=&gt; {}
}
<span class="comment">// Make sure a digit follows the exponent place.
</span><span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.next_char_or_null()) {
<span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; {}
<span class="kw">_ </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::InvalidNumber));
}
}
<span class="kw">while let </span><span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>= <span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) {
<span class="self">self</span>.eat_char();
}
<span class="prelude-val">Ok</span>(())
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;raw_value&quot;</span>)]
</span><span class="kw">fn </span>deserialize_raw_value&lt;V&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.parse_whitespace()<span class="question-mark">?</span>;
<span class="self">self</span>.read.begin_raw_buffering();
<span class="self">self</span>.ignore_value()<span class="question-mark">?</span>;
<span class="self">self</span>.read.end_raw_buffering(visitor)
}
}
<span class="kw">impl </span>FromStr <span class="kw">for </span>Number {
<span class="kw">type </span><span class="prelude-val">Err </span>= Error;
<span class="kw">fn </span>from_str(s: <span class="kw-2">&amp;</span>str) -&gt; result::Result&lt;<span class="self">Self</span>, <span class="self">Self</span>::Err&gt; {
Deserializer::from_str(s)
.parse_any_signed_number()
.map(Into::into)
}
}
<span class="attribute">#[cfg(not(feature = <span class="string">&quot;float_roundtrip&quot;</span>))]
</span><span class="kw">static </span>POW10: [f64; <span class="number">309</span>] = [
<span class="number">1e000</span>, <span class="number">1e001</span>, <span class="number">1e002</span>, <span class="number">1e003</span>, <span class="number">1e004</span>, <span class="number">1e005</span>, <span class="number">1e006</span>, <span class="number">1e007</span>, <span class="number">1e008</span>, <span class="number">1e009</span>, <span class="comment">//
</span><span class="number">1e010</span>, <span class="number">1e011</span>, <span class="number">1e012</span>, <span class="number">1e013</span>, <span class="number">1e014</span>, <span class="number">1e015</span>, <span class="number">1e016</span>, <span class="number">1e017</span>, <span class="number">1e018</span>, <span class="number">1e019</span>, <span class="comment">//
</span><span class="number">1e020</span>, <span class="number">1e021</span>, <span class="number">1e022</span>, <span class="number">1e023</span>, <span class="number">1e024</span>, <span class="number">1e025</span>, <span class="number">1e026</span>, <span class="number">1e027</span>, <span class="number">1e028</span>, <span class="number">1e029</span>, <span class="comment">//
</span><span class="number">1e030</span>, <span class="number">1e031</span>, <span class="number">1e032</span>, <span class="number">1e033</span>, <span class="number">1e034</span>, <span class="number">1e035</span>, <span class="number">1e036</span>, <span class="number">1e037</span>, <span class="number">1e038</span>, <span class="number">1e039</span>, <span class="comment">//
</span><span class="number">1e040</span>, <span class="number">1e041</span>, <span class="number">1e042</span>, <span class="number">1e043</span>, <span class="number">1e044</span>, <span class="number">1e045</span>, <span class="number">1e046</span>, <span class="number">1e047</span>, <span class="number">1e048</span>, <span class="number">1e049</span>, <span class="comment">//
</span><span class="number">1e050</span>, <span class="number">1e051</span>, <span class="number">1e052</span>, <span class="number">1e053</span>, <span class="number">1e054</span>, <span class="number">1e055</span>, <span class="number">1e056</span>, <span class="number">1e057</span>, <span class="number">1e058</span>, <span class="number">1e059</span>, <span class="comment">//
</span><span class="number">1e060</span>, <span class="number">1e061</span>, <span class="number">1e062</span>, <span class="number">1e063</span>, <span class="number">1e064</span>, <span class="number">1e065</span>, <span class="number">1e066</span>, <span class="number">1e067</span>, <span class="number">1e068</span>, <span class="number">1e069</span>, <span class="comment">//
</span><span class="number">1e070</span>, <span class="number">1e071</span>, <span class="number">1e072</span>, <span class="number">1e073</span>, <span class="number">1e074</span>, <span class="number">1e075</span>, <span class="number">1e076</span>, <span class="number">1e077</span>, <span class="number">1e078</span>, <span class="number">1e079</span>, <span class="comment">//
</span><span class="number">1e080</span>, <span class="number">1e081</span>, <span class="number">1e082</span>, <span class="number">1e083</span>, <span class="number">1e084</span>, <span class="number">1e085</span>, <span class="number">1e086</span>, <span class="number">1e087</span>, <span class="number">1e088</span>, <span class="number">1e089</span>, <span class="comment">//
</span><span class="number">1e090</span>, <span class="number">1e091</span>, <span class="number">1e092</span>, <span class="number">1e093</span>, <span class="number">1e094</span>, <span class="number">1e095</span>, <span class="number">1e096</span>, <span class="number">1e097</span>, <span class="number">1e098</span>, <span class="number">1e099</span>, <span class="comment">//
</span><span class="number">1e100</span>, <span class="number">1e101</span>, <span class="number">1e102</span>, <span class="number">1e103</span>, <span class="number">1e104</span>, <span class="number">1e105</span>, <span class="number">1e106</span>, <span class="number">1e107</span>, <span class="number">1e108</span>, <span class="number">1e109</span>, <span class="comment">//
</span><span class="number">1e110</span>, <span class="number">1e111</span>, <span class="number">1e112</span>, <span class="number">1e113</span>, <span class="number">1e114</span>, <span class="number">1e115</span>, <span class="number">1e116</span>, <span class="number">1e117</span>, <span class="number">1e118</span>, <span class="number">1e119</span>, <span class="comment">//
</span><span class="number">1e120</span>, <span class="number">1e121</span>, <span class="number">1e122</span>, <span class="number">1e123</span>, <span class="number">1e124</span>, <span class="number">1e125</span>, <span class="number">1e126</span>, <span class="number">1e127</span>, <span class="number">1e128</span>, <span class="number">1e129</span>, <span class="comment">//
</span><span class="number">1e130</span>, <span class="number">1e131</span>, <span class="number">1e132</span>, <span class="number">1e133</span>, <span class="number">1e134</span>, <span class="number">1e135</span>, <span class="number">1e136</span>, <span class="number">1e137</span>, <span class="number">1e138</span>, <span class="number">1e139</span>, <span class="comment">//
</span><span class="number">1e140</span>, <span class="number">1e141</span>, <span class="number">1e142</span>, <span class="number">1e143</span>, <span class="number">1e144</span>, <span class="number">1e145</span>, <span class="number">1e146</span>, <span class="number">1e147</span>, <span class="number">1e148</span>, <span class="number">1e149</span>, <span class="comment">//
</span><span class="number">1e150</span>, <span class="number">1e151</span>, <span class="number">1e152</span>, <span class="number">1e153</span>, <span class="number">1e154</span>, <span class="number">1e155</span>, <span class="number">1e156</span>, <span class="number">1e157</span>, <span class="number">1e158</span>, <span class="number">1e159</span>, <span class="comment">//
</span><span class="number">1e160</span>, <span class="number">1e161</span>, <span class="number">1e162</span>, <span class="number">1e163</span>, <span class="number">1e164</span>, <span class="number">1e165</span>, <span class="number">1e166</span>, <span class="number">1e167</span>, <span class="number">1e168</span>, <span class="number">1e169</span>, <span class="comment">//
</span><span class="number">1e170</span>, <span class="number">1e171</span>, <span class="number">1e172</span>, <span class="number">1e173</span>, <span class="number">1e174</span>, <span class="number">1e175</span>, <span class="number">1e176</span>, <span class="number">1e177</span>, <span class="number">1e178</span>, <span class="number">1e179</span>, <span class="comment">//
</span><span class="number">1e180</span>, <span class="number">1e181</span>, <span class="number">1e182</span>, <span class="number">1e183</span>, <span class="number">1e184</span>, <span class="number">1e185</span>, <span class="number">1e186</span>, <span class="number">1e187</span>, <span class="number">1e188</span>, <span class="number">1e189</span>, <span class="comment">//
</span><span class="number">1e190</span>, <span class="number">1e191</span>, <span class="number">1e192</span>, <span class="number">1e193</span>, <span class="number">1e194</span>, <span class="number">1e195</span>, <span class="number">1e196</span>, <span class="number">1e197</span>, <span class="number">1e198</span>, <span class="number">1e199</span>, <span class="comment">//
</span><span class="number">1e200</span>, <span class="number">1e201</span>, <span class="number">1e202</span>, <span class="number">1e203</span>, <span class="number">1e204</span>, <span class="number">1e205</span>, <span class="number">1e206</span>, <span class="number">1e207</span>, <span class="number">1e208</span>, <span class="number">1e209</span>, <span class="comment">//
</span><span class="number">1e210</span>, <span class="number">1e211</span>, <span class="number">1e212</span>, <span class="number">1e213</span>, <span class="number">1e214</span>, <span class="number">1e215</span>, <span class="number">1e216</span>, <span class="number">1e217</span>, <span class="number">1e218</span>, <span class="number">1e219</span>, <span class="comment">//
</span><span class="number">1e220</span>, <span class="number">1e221</span>, <span class="number">1e222</span>, <span class="number">1e223</span>, <span class="number">1e224</span>, <span class="number">1e225</span>, <span class="number">1e226</span>, <span class="number">1e227</span>, <span class="number">1e228</span>, <span class="number">1e229</span>, <span class="comment">//
</span><span class="number">1e230</span>, <span class="number">1e231</span>, <span class="number">1e232</span>, <span class="number">1e233</span>, <span class="number">1e234</span>, <span class="number">1e235</span>, <span class="number">1e236</span>, <span class="number">1e237</span>, <span class="number">1e238</span>, <span class="number">1e239</span>, <span class="comment">//
</span><span class="number">1e240</span>, <span class="number">1e241</span>, <span class="number">1e242</span>, <span class="number">1e243</span>, <span class="number">1e244</span>, <span class="number">1e245</span>, <span class="number">1e246</span>, <span class="number">1e247</span>, <span class="number">1e248</span>, <span class="number">1e249</span>, <span class="comment">//
</span><span class="number">1e250</span>, <span class="number">1e251</span>, <span class="number">1e252</span>, <span class="number">1e253</span>, <span class="number">1e254</span>, <span class="number">1e255</span>, <span class="number">1e256</span>, <span class="number">1e257</span>, <span class="number">1e258</span>, <span class="number">1e259</span>, <span class="comment">//
</span><span class="number">1e260</span>, <span class="number">1e261</span>, <span class="number">1e262</span>, <span class="number">1e263</span>, <span class="number">1e264</span>, <span class="number">1e265</span>, <span class="number">1e266</span>, <span class="number">1e267</span>, <span class="number">1e268</span>, <span class="number">1e269</span>, <span class="comment">//
</span><span class="number">1e270</span>, <span class="number">1e271</span>, <span class="number">1e272</span>, <span class="number">1e273</span>, <span class="number">1e274</span>, <span class="number">1e275</span>, <span class="number">1e276</span>, <span class="number">1e277</span>, <span class="number">1e278</span>, <span class="number">1e279</span>, <span class="comment">//
</span><span class="number">1e280</span>, <span class="number">1e281</span>, <span class="number">1e282</span>, <span class="number">1e283</span>, <span class="number">1e284</span>, <span class="number">1e285</span>, <span class="number">1e286</span>, <span class="number">1e287</span>, <span class="number">1e288</span>, <span class="number">1e289</span>, <span class="comment">//
</span><span class="number">1e290</span>, <span class="number">1e291</span>, <span class="number">1e292</span>, <span class="number">1e293</span>, <span class="number">1e294</span>, <span class="number">1e295</span>, <span class="number">1e296</span>, <span class="number">1e297</span>, <span class="number">1e298</span>, <span class="number">1e299</span>, <span class="comment">//
</span><span class="number">1e300</span>, <span class="number">1e301</span>, <span class="number">1e302</span>, <span class="number">1e303</span>, <span class="number">1e304</span>, <span class="number">1e305</span>, <span class="number">1e306</span>, <span class="number">1e307</span>, <span class="number">1e308</span>,
];
<span class="macro">macro_rules! </span>deserialize_number {
(<span class="macro-nonterminal">$method</span>:ident) =&gt; {
<span class="kw">fn </span><span class="macro-nonterminal">$method</span>&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.deserialize_number(visitor)
}
};
}
<span class="attribute">#[cfg(not(feature = <span class="string">&quot;unbounded_depth&quot;</span>))]
</span><span class="macro">macro_rules! </span>if_checking_recursion_limit {
($(<span class="macro-nonterminal">$body</span>:tt)<span class="kw-2">*</span>) =&gt; {
$(<span class="macro-nonterminal">$body</span>)*
};
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;unbounded_depth&quot;</span>)]
</span><span class="macro">macro_rules! </span>if_checking_recursion_limit {
(<span class="macro-nonterminal">$this</span>:ident $(<span class="macro-nonterminal">$body</span>:tt)<span class="kw-2">*</span>) =&gt; {
<span class="kw">if </span>!<span class="macro-nonterminal">$this</span>.disable_recursion_limit {
<span class="macro-nonterminal">$this </span>$(<span class="macro-nonterminal">$body</span>)*
}
};
}
<span class="macro">macro_rules! </span>check_recursion {
(<span class="macro-nonterminal">$this</span>:ident $(<span class="macro-nonterminal">$body</span>:tt)<span class="kw-2">*</span>) =&gt; {
<span class="macro">if_checking_recursion_limit! </span>{
<span class="macro-nonterminal">$this</span>.remaining_depth -= <span class="number">1</span>;
<span class="kw">if </span><span class="macro-nonterminal">$this</span>.remaining_depth == <span class="number">0 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="macro-nonterminal">$this</span>.peek_error(ErrorCode::RecursionLimitExceeded));
}
}
<span class="macro-nonterminal">$this </span>$(<span class="macro-nonterminal">$body</span>)*
<span class="macro">if_checking_recursion_limit! </span>{
<span class="macro-nonterminal">$this</span>.remaining_depth += <span class="number">1</span>;
}
};
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, <span class="lifetime">&#39;a</span>, R: Read&lt;<span class="lifetime">&#39;de</span>&gt;&gt; de::Deserializer&lt;<span class="lifetime">&#39;de</span>&gt; <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>Deserializer&lt;R&gt; {
<span class="kw">type </span>Error = Error;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>deserialize_any&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span>peek = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue));
}
};
<span class="kw">let </span>value = <span class="kw">match </span>peek {
<span class="string">b&#39;n&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b&quot;ull&quot;</span>));
visitor.visit_unit()
}
<span class="string">b&#39;t&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b&quot;rue&quot;</span>));
visitor.visit_bool(<span class="bool-val">true</span>)
}
<span class="string">b&#39;f&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b&quot;alse&quot;</span>));
visitor.visit_bool(<span class="bool-val">false</span>)
}
<span class="string">b&#39;-&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.parse_any_number(<span class="bool-val">false</span>)).visit(visitor)
}
<span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;9&#39; </span>=&gt; <span class="macro">tri!</span>(<span class="self">self</span>.parse_any_number(<span class="bool-val">true</span>)).visit(visitor),
<span class="string">b&#39;&quot;&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="self">self</span>.scratch.clear();
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.read.parse_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>.scratch)) {
Reference::Borrowed(s) =&gt; visitor.visit_borrowed_str(s),
Reference::Copied(s) =&gt; visitor.visit_str(s),
}
}
<span class="string">b&#39;[&#39; </span>=&gt; {
<span class="macro">check_recursion! </span>{
<span class="self">self</span>.eat_char();
<span class="kw">let </span>ret = visitor.visit_seq(SeqAccess::new(<span class="self">self</span>));
}
<span class="kw">match </span>(ret, <span class="self">self</span>.end_seq()) {
(<span class="prelude-val">Ok</span>(ret), <span class="prelude-val">Ok</span>(())) =&gt; <span class="prelude-val">Ok</span>(ret),
(<span class="prelude-val">Err</span>(err), <span class="kw">_</span>) | (<span class="kw">_</span>, <span class="prelude-val">Err</span>(err)) =&gt; <span class="prelude-val">Err</span>(err),
}
}
<span class="string">b&#39;{&#39; </span>=&gt; {
<span class="macro">check_recursion! </span>{
<span class="self">self</span>.eat_char();
<span class="kw">let </span>ret = visitor.visit_map(MapAccess::new(<span class="self">self</span>));
}
<span class="kw">match </span>(ret, <span class="self">self</span>.end_map()) {
(<span class="prelude-val">Ok</span>(ret), <span class="prelude-val">Ok</span>(())) =&gt; <span class="prelude-val">Ok</span>(ret),
(<span class="prelude-val">Err</span>(err), <span class="kw">_</span>) | (<span class="kw">_</span>, <span class="prelude-val">Err</span>(err)) =&gt; <span class="prelude-val">Err</span>(err),
}
}
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::ExpectedSomeValue)),
};
<span class="kw">match </span>value {
<span class="prelude-val">Ok</span>(value) =&gt; <span class="prelude-val">Ok</span>(value),
<span class="comment">// The de::Error impl creates errors with unknown line and column.
// Fill in the position here by looking at the current index in the
// input. There is no way to tell whether this should call `error`
// or `peek_error` so pick the one that seems correct more often.
// Worst case, the position is off by one character.
</span><span class="prelude-val">Err</span>(err) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)),
}
}
<span class="kw">fn </span>deserialize_bool&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span>peek = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue));
}
};
<span class="kw">let </span>value = <span class="kw">match </span>peek {
<span class="string">b&#39;t&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b&quot;rue&quot;</span>));
visitor.visit_bool(<span class="bool-val">true</span>)
}
<span class="string">b&#39;f&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b&quot;alse&quot;</span>));
visitor.visit_bool(<span class="bool-val">false</span>)
}
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&amp;</span>visitor)),
};
<span class="kw">match </span>value {
<span class="prelude-val">Ok</span>(value) =&gt; <span class="prelude-val">Ok</span>(value),
<span class="prelude-val">Err</span>(err) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)),
}
}
<span class="macro">deserialize_number!</span>(deserialize_i8);
<span class="macro">deserialize_number!</span>(deserialize_i16);
<span class="macro">deserialize_number!</span>(deserialize_i32);
<span class="macro">deserialize_number!</span>(deserialize_i64);
<span class="macro">deserialize_number!</span>(deserialize_u8);
<span class="macro">deserialize_number!</span>(deserialize_u16);
<span class="macro">deserialize_number!</span>(deserialize_u32);
<span class="macro">deserialize_number!</span>(deserialize_u64);
<span class="attribute">#[cfg(not(feature = <span class="string">&quot;float_roundtrip&quot;</span>))]
</span><span class="macro">deserialize_number!</span>(deserialize_f32);
<span class="macro">deserialize_number!</span>(deserialize_f64);
<span class="attribute">#[cfg(feature = <span class="string">&quot;float_roundtrip&quot;</span>)]
</span><span class="kw">fn </span>deserialize_f32&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.single_precision = <span class="bool-val">true</span>;
<span class="kw">let </span>val = <span class="self">self</span>.deserialize_number(visitor);
<span class="self">self</span>.single_precision = <span class="bool-val">false</span>;
val
}
<span class="kw">fn </span>deserialize_i128&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span><span class="kw-2">mut </span>buf = String::new();
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39;-&#39;</span>) =&gt; {
<span class="self">self</span>.eat_char();
buf.push(<span class="string">&#39;-&#39;</span>);
}
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; {}
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue));
}
};
<span class="macro">tri!</span>(<span class="self">self</span>.scan_integer128(<span class="kw-2">&amp;mut </span>buf));
<span class="kw">let </span>value = <span class="kw">match </span>buf.parse() {
<span class="prelude-val">Ok</span>(int) =&gt; visitor.visit_i128(int),
<span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::NumberOutOfRange));
}
};
<span class="kw">match </span>value {
<span class="prelude-val">Ok</span>(value) =&gt; <span class="prelude-val">Ok</span>(value),
<span class="prelude-val">Err</span>(err) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)),
}
}
<span class="kw">fn </span>deserialize_u128&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39;-&#39;</span>) =&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::NumberOutOfRange));
}
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; {}
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue));
}
}
<span class="kw">let </span><span class="kw-2">mut </span>buf = String::new();
<span class="macro">tri!</span>(<span class="self">self</span>.scan_integer128(<span class="kw-2">&amp;mut </span>buf));
<span class="kw">let </span>value = <span class="kw">match </span>buf.parse() {
<span class="prelude-val">Ok</span>(int) =&gt; visitor.visit_u128(int),
<span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::NumberOutOfRange));
}
};
<span class="kw">match </span>value {
<span class="prelude-val">Ok</span>(value) =&gt; <span class="prelude-val">Ok</span>(value),
<span class="prelude-val">Err</span>(err) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)),
}
}
<span class="kw">fn </span>deserialize_char&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.deserialize_str(visitor)
}
<span class="kw">fn </span>deserialize_str&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span>peek = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue));
}
};
<span class="kw">let </span>value = <span class="kw">match </span>peek {
<span class="string">b&#39;&quot;&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="self">self</span>.scratch.clear();
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.read.parse_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>.scratch)) {
Reference::Borrowed(s) =&gt; visitor.visit_borrowed_str(s),
Reference::Copied(s) =&gt; visitor.visit_str(s),
}
}
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&amp;</span>visitor)),
};
<span class="kw">match </span>value {
<span class="prelude-val">Ok</span>(value) =&gt; <span class="prelude-val">Ok</span>(value),
<span class="prelude-val">Err</span>(err) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)),
}
}
<span class="kw">fn </span>deserialize_string&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.deserialize_str(visitor)
}
<span class="doccomment">/// Parses a JSON string as bytes. Note that this function does not check
/// whether the bytes represent a valid UTF-8 string.
///
/// The relevant part of the JSON specification is Section 8.2 of [RFC
/// 7159]:
///
/// &gt; When all the strings represented in a JSON text are composed entirely
/// &gt; of Unicode characters (however escaped), then that JSON text is
/// &gt; interoperable in the sense that all software implementations that
/// &gt; parse it will agree on the contents of names and of string values in
/// &gt; objects and arrays.
/// &gt;
/// &gt; However, the ABNF in this specification allows member names and string
/// &gt; values to contain bit sequences that cannot encode Unicode characters;
/// &gt; for example, &quot;\uDEAD&quot; (a single unpaired UTF-16 surrogate). Instances
/// &gt; of this have been observed, for example, when a library truncates a
/// &gt; UTF-16 string without checking whether the truncation split a
/// &gt; surrogate pair. The behavior of software that receives JSON texts
/// &gt; containing such values is unpredictable; for example, implementations
/// &gt; might return different values for the length of a string value or even
/// &gt; suffer fatal runtime exceptions.
///
/// [RFC 7159]: https://tools.ietf.org/html/rfc7159
///
/// The behavior of serde_json is specified to fail on non-UTF-8 strings
/// when deserializing into Rust UTF-8 string types such as String, and
/// succeed with non-UTF-8 bytes when deserializing using this method.
///
/// Escape sequences are processed as usual, and for `\uXXXX` escapes it is
/// still checked if the hex number represents a valid Unicode code point.
///
/// # Examples
///
/// You can use this to parse JSON strings containing invalid UTF-8 bytes,
/// or unpaired surrogates.
///
/// ```
/// use serde_bytes::ByteBuf;
///
/// fn look_at_bytes() -&gt; Result&lt;(), serde_json::Error&gt; {
/// let json_data = b&quot;\&quot;some bytes: \xe5\x00\xe5\&quot;&quot;;
/// let bytes: ByteBuf = serde_json::from_slice(json_data)?;
///
/// assert_eq!(b&#39;\xe5&#39;, bytes[12]);
/// assert_eq!(b&#39;\0&#39;, bytes[13]);
/// assert_eq!(b&#39;\xe5&#39;, bytes[14]);
///
/// Ok(())
/// }
/// #
/// # look_at_bytes().unwrap();
/// ```
///
/// Backslash escape sequences like `\n` are still interpreted and required
/// to be valid. `\u` escape sequences are required to represent a valid
/// Unicode code point or lone surrogate.
///
/// ```
/// use serde_bytes::ByteBuf;
///
/// fn look_at_bytes() -&gt; Result&lt;(), serde_json::Error&gt; {
/// let json_data = b&quot;\&quot;lone surrogate: \\uD801\&quot;&quot;;
/// let bytes: ByteBuf = serde_json::from_slice(json_data)?;
/// let expected = b&quot;lone surrogate: \xED\xA0\x81&quot;;
/// assert_eq!(expected, bytes.as_slice());
/// Ok(())
/// }
/// #
/// # look_at_bytes();
/// ```
</span><span class="kw">fn </span>deserialize_bytes&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span>peek = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue));
}
};
<span class="kw">let </span>value = <span class="kw">match </span>peek {
<span class="string">b&#39;&quot;&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="self">self</span>.scratch.clear();
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.read.parse_str_raw(<span class="kw-2">&amp;mut </span><span class="self">self</span>.scratch)) {
Reference::Borrowed(b) =&gt; visitor.visit_borrowed_bytes(b),
Reference::Copied(b) =&gt; visitor.visit_bytes(b),
}
}
<span class="string">b&#39;[&#39; </span>=&gt; <span class="self">self</span>.deserialize_seq(visitor),
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&amp;</span>visitor)),
};
<span class="kw">match </span>value {
<span class="prelude-val">Ok</span>(value) =&gt; <span class="prelude-val">Ok</span>(value),
<span class="prelude-val">Err</span>(err) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)),
}
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>deserialize_byte_buf&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.deserialize_bytes(visitor)
}
<span class="doccomment">/// Parses a `null` as a None, and any other values as a `Some(...)`.
</span><span class="attribute">#[inline]
</span><span class="kw">fn </span>deserialize_option&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39;n&#39;</span>) =&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b&quot;ull&quot;</span>));
visitor.visit_none()
}
<span class="kw">_ </span>=&gt; visitor.visit_some(<span class="self">self</span>),
}
}
<span class="kw">fn </span>deserialize_unit&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span>peek = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue));
}
};
<span class="kw">let </span>value = <span class="kw">match </span>peek {
<span class="string">b&#39;n&#39; </span>=&gt; {
<span class="self">self</span>.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b&quot;ull&quot;</span>));
visitor.visit_unit()
}
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&amp;</span>visitor)),
};
<span class="kw">match </span>value {
<span class="prelude-val">Ok</span>(value) =&gt; <span class="prelude-val">Ok</span>(value),
<span class="prelude-val">Err</span>(err) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)),
}
}
<span class="kw">fn </span>deserialize_unit_struct&lt;V&gt;(<span class="self">self</span>, _name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.deserialize_unit(visitor)
}
<span class="doccomment">/// Parses a newtype struct as the underlying value.
</span><span class="attribute">#[inline]
</span><span class="kw">fn </span>deserialize_newtype_struct&lt;V&gt;(<span class="self">self</span>, name: <span class="kw-2">&amp;</span>str, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="attribute">#[cfg(feature = <span class="string">&quot;raw_value&quot;</span>)]
</span>{
<span class="kw">if </span>name == <span class="kw">crate</span>::raw::TOKEN {
<span class="kw">return </span><span class="self">self</span>.deserialize_raw_value(visitor);
}
}
<span class="kw">let _ </span>= name;
visitor.visit_newtype_struct(<span class="self">self</span>)
}
<span class="kw">fn </span>deserialize_seq&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span>peek = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue));
}
};
<span class="kw">let </span>value = <span class="kw">match </span>peek {
<span class="string">b&#39;[&#39; </span>=&gt; {
<span class="macro">check_recursion! </span>{
<span class="self">self</span>.eat_char();
<span class="kw">let </span>ret = visitor.visit_seq(SeqAccess::new(<span class="self">self</span>));
}
<span class="kw">match </span>(ret, <span class="self">self</span>.end_seq()) {
(<span class="prelude-val">Ok</span>(ret), <span class="prelude-val">Ok</span>(())) =&gt; <span class="prelude-val">Ok</span>(ret),
(<span class="prelude-val">Err</span>(err), <span class="kw">_</span>) | (<span class="kw">_</span>, <span class="prelude-val">Err</span>(err)) =&gt; <span class="prelude-val">Err</span>(err),
}
}
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&amp;</span>visitor)),
};
<span class="kw">match </span>value {
<span class="prelude-val">Ok</span>(value) =&gt; <span class="prelude-val">Ok</span>(value),
<span class="prelude-val">Err</span>(err) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)),
}
}
<span class="kw">fn </span>deserialize_tuple&lt;V&gt;(<span class="self">self</span>, _len: usize, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.deserialize_seq(visitor)
}
<span class="kw">fn </span>deserialize_tuple_struct&lt;V&gt;(
<span class="self">self</span>,
_name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
_len: usize,
visitor: V,
) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.deserialize_seq(visitor)
}
<span class="kw">fn </span>deserialize_map&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span>peek = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue));
}
};
<span class="kw">let </span>value = <span class="kw">match </span>peek {
<span class="string">b&#39;{&#39; </span>=&gt; {
<span class="macro">check_recursion! </span>{
<span class="self">self</span>.eat_char();
<span class="kw">let </span>ret = visitor.visit_map(MapAccess::new(<span class="self">self</span>));
}
<span class="kw">match </span>(ret, <span class="self">self</span>.end_map()) {
(<span class="prelude-val">Ok</span>(ret), <span class="prelude-val">Ok</span>(())) =&gt; <span class="prelude-val">Ok</span>(ret),
(<span class="prelude-val">Err</span>(err), <span class="kw">_</span>) | (<span class="kw">_</span>, <span class="prelude-val">Err</span>(err)) =&gt; <span class="prelude-val">Err</span>(err),
}
}
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&amp;</span>visitor)),
};
<span class="kw">match </span>value {
<span class="prelude-val">Ok</span>(value) =&gt; <span class="prelude-val">Ok</span>(value),
<span class="prelude-val">Err</span>(err) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)),
}
}
<span class="kw">fn </span>deserialize_struct&lt;V&gt;(
<span class="self">self</span>,
_name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
_fields: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>[<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str],
visitor: V,
) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span>peek = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(b) =&gt; b,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue));
}
};
<span class="kw">let </span>value = <span class="kw">match </span>peek {
<span class="string">b&#39;[&#39; </span>=&gt; {
<span class="macro">check_recursion! </span>{
<span class="self">self</span>.eat_char();
<span class="kw">let </span>ret = visitor.visit_seq(SeqAccess::new(<span class="self">self</span>));
}
<span class="kw">match </span>(ret, <span class="self">self</span>.end_seq()) {
(<span class="prelude-val">Ok</span>(ret), <span class="prelude-val">Ok</span>(())) =&gt; <span class="prelude-val">Ok</span>(ret),
(<span class="prelude-val">Err</span>(err), <span class="kw">_</span>) | (<span class="kw">_</span>, <span class="prelude-val">Err</span>(err)) =&gt; <span class="prelude-val">Err</span>(err),
}
}
<span class="string">b&#39;{&#39; </span>=&gt; {
<span class="macro">check_recursion! </span>{
<span class="self">self</span>.eat_char();
<span class="kw">let </span>ret = visitor.visit_map(MapAccess::new(<span class="self">self</span>));
}
<span class="kw">match </span>(ret, <span class="self">self</span>.end_map()) {
(<span class="prelude-val">Ok</span>(ret), <span class="prelude-val">Ok</span>(())) =&gt; <span class="prelude-val">Ok</span>(ret),
(<span class="prelude-val">Err</span>(err), <span class="kw">_</span>) | (<span class="kw">_</span>, <span class="prelude-val">Err</span>(err)) =&gt; <span class="prelude-val">Err</span>(err),
}
}
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&amp;</span>visitor)),
};
<span class="kw">match </span>value {
<span class="prelude-val">Ok</span>(value) =&gt; <span class="prelude-val">Ok</span>(value),
<span class="prelude-val">Err</span>(err) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)),
}
}
<span class="doccomment">/// Parses an enum as an object like `{&quot;$KEY&quot;:$VALUE}`, where $VALUE is either a straight
/// value, a `[..]`, or a `{..}`.
</span><span class="attribute">#[inline]
</span><span class="kw">fn </span>deserialize_enum&lt;V&gt;(
<span class="self">self</span>,
_name: <span class="kw-2">&amp;</span>str,
_variants: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>[<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str],
visitor: V,
) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39;{&#39;</span>) =&gt; {
<span class="macro">check_recursion! </span>{
<span class="self">self</span>.eat_char();
<span class="kw">let </span>value = <span class="macro">tri!</span>(visitor.visit_enum(VariantAccess::new(<span class="self">self</span>)));
}
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39;}&#39;</span>) =&gt; {
<span class="self">self</span>.eat_char();
<span class="prelude-val">Ok</span>(value)
}
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::ExpectedSomeValue)),
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::EofWhileParsingObject)),
}
}
<span class="prelude-val">Some</span>(<span class="string">b&#39;&quot;&#39;</span>) =&gt; visitor.visit_enum(UnitVariantAccess::new(<span class="self">self</span>)),
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::ExpectedSomeValue)),
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue)),
}
}
<span class="kw">fn </span>deserialize_identifier&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.deserialize_str(visitor)
}
<span class="kw">fn </span>deserialize_ignored_any&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="macro">tri!</span>(<span class="self">self</span>.ignore_value());
visitor.visit_unit()
}
}
<span class="kw">struct </span>SeqAccess&lt;<span class="lifetime">&#39;a</span>, R: <span class="lifetime">&#39;a</span>&gt; {
de: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>Deserializer&lt;R&gt;,
first: bool,
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, R: <span class="lifetime">&#39;a</span>&gt; SeqAccess&lt;<span class="lifetime">&#39;a</span>, R&gt; {
<span class="kw">fn </span>new(de: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>Deserializer&lt;R&gt;) -&gt; <span class="self">Self </span>{
SeqAccess { de, first: <span class="bool-val">true </span>}
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, <span class="lifetime">&#39;a</span>, R: Read&lt;<span class="lifetime">&#39;de</span>&gt; + <span class="lifetime">&#39;a</span>&gt; de::SeqAccess&lt;<span class="lifetime">&#39;de</span>&gt; <span class="kw">for </span>SeqAccess&lt;<span class="lifetime">&#39;a</span>, R&gt; {
<span class="kw">type </span>Error = Error;
<span class="kw">fn </span>next_element_seed&lt;T&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, seed: T) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;T::Value&gt;&gt;
<span class="kw">where
</span>T: de::DeserializeSeed&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span>peek = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.de.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39;]&#39;</span>) =&gt; {
<span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>);
}
<span class="prelude-val">Some</span>(<span class="string">b&#39;,&#39;</span>) <span class="kw">if </span>!<span class="self">self</span>.first =&gt; {
<span class="self">self</span>.de.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.de.parse_whitespace())
}
<span class="prelude-val">Some</span>(b) =&gt; {
<span class="kw">if </span><span class="self">self</span>.first {
<span class="self">self</span>.first = <span class="bool-val">false</span>;
<span class="prelude-val">Some</span>(b)
} <span class="kw">else </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.de.peek_error(ErrorCode::ExpectedListCommaOrEnd));
}
}
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.de.peek_error(ErrorCode::EofWhileParsingList));
}
};
<span class="kw">match </span>peek {
<span class="prelude-val">Some</span>(<span class="string">b&#39;]&#39;</span>) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.de.peek_error(ErrorCode::TrailingComma)),
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="macro">tri!</span>(seed.deserialize(<span class="kw-2">&amp;mut *</span><span class="self">self</span>.de)))),
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.de.peek_error(ErrorCode::EofWhileParsingValue)),
}
}
}
<span class="kw">struct </span>MapAccess&lt;<span class="lifetime">&#39;a</span>, R: <span class="lifetime">&#39;a</span>&gt; {
de: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>Deserializer&lt;R&gt;,
first: bool,
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, R: <span class="lifetime">&#39;a</span>&gt; MapAccess&lt;<span class="lifetime">&#39;a</span>, R&gt; {
<span class="kw">fn </span>new(de: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>Deserializer&lt;R&gt;) -&gt; <span class="self">Self </span>{
MapAccess { de, first: <span class="bool-val">true </span>}
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, <span class="lifetime">&#39;a</span>, R: Read&lt;<span class="lifetime">&#39;de</span>&gt; + <span class="lifetime">&#39;a</span>&gt; de::MapAccess&lt;<span class="lifetime">&#39;de</span>&gt; <span class="kw">for </span>MapAccess&lt;<span class="lifetime">&#39;a</span>, R&gt; {
<span class="kw">type </span>Error = Error;
<span class="kw">fn </span>next_key_seed&lt;K&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, seed: K) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;K::Value&gt;&gt;
<span class="kw">where
</span>K: de::DeserializeSeed&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span>peek = <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.de.parse_whitespace()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39;}&#39;</span>) =&gt; {
<span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>);
}
<span class="prelude-val">Some</span>(<span class="string">b&#39;,&#39;</span>) <span class="kw">if </span>!<span class="self">self</span>.first =&gt; {
<span class="self">self</span>.de.eat_char();
<span class="macro">tri!</span>(<span class="self">self</span>.de.parse_whitespace())
}
<span class="prelude-val">Some</span>(b) =&gt; {
<span class="kw">if </span><span class="self">self</span>.first {
<span class="self">self</span>.first = <span class="bool-val">false</span>;
<span class="prelude-val">Some</span>(b)
} <span class="kw">else </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.de.peek_error(ErrorCode::ExpectedObjectCommaOrEnd));
}
}
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.de.peek_error(ErrorCode::EofWhileParsingObject));
}
};
<span class="kw">match </span>peek {
<span class="prelude-val">Some</span>(<span class="string">b&#39;&quot;&#39;</span>) =&gt; seed.deserialize(MapKey { de: <span class="kw-2">&amp;mut *</span><span class="self">self</span>.de }).map(<span class="prelude-val">Some</span>),
<span class="prelude-val">Some</span>(<span class="string">b&#39;}&#39;</span>) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.de.peek_error(ErrorCode::TrailingComma)),
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.de.peek_error(ErrorCode::KeyMustBeAString)),
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.de.peek_error(ErrorCode::EofWhileParsingValue)),
}
}
<span class="kw">fn </span>next_value_seed&lt;V&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, seed: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::DeserializeSeed&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="macro">tri!</span>(<span class="self">self</span>.de.parse_object_colon());
seed.deserialize(<span class="kw-2">&amp;mut *</span><span class="self">self</span>.de)
}
}
<span class="kw">struct </span>VariantAccess&lt;<span class="lifetime">&#39;a</span>, R: <span class="lifetime">&#39;a</span>&gt; {
de: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>Deserializer&lt;R&gt;,
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, R: <span class="lifetime">&#39;a</span>&gt; VariantAccess&lt;<span class="lifetime">&#39;a</span>, R&gt; {
<span class="kw">fn </span>new(de: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>Deserializer&lt;R&gt;) -&gt; <span class="self">Self </span>{
VariantAccess { de }
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, <span class="lifetime">&#39;a</span>, R: Read&lt;<span class="lifetime">&#39;de</span>&gt; + <span class="lifetime">&#39;a</span>&gt; de::EnumAccess&lt;<span class="lifetime">&#39;de</span>&gt; <span class="kw">for </span>VariantAccess&lt;<span class="lifetime">&#39;a</span>, R&gt; {
<span class="kw">type </span>Error = Error;
<span class="kw">type </span>Variant = <span class="self">Self</span>;
<span class="kw">fn </span>variant_seed&lt;V&gt;(<span class="self">self</span>, seed: V) -&gt; <span class="prelude-ty">Result</span>&lt;(V::Value, <span class="self">Self</span>)&gt;
<span class="kw">where
</span>V: de::DeserializeSeed&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span>val = <span class="macro">tri!</span>(seed.deserialize(<span class="kw-2">&amp;mut *</span><span class="self">self</span>.de));
<span class="macro">tri!</span>(<span class="self">self</span>.de.parse_object_colon());
<span class="prelude-val">Ok</span>((val, <span class="self">self</span>))
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, <span class="lifetime">&#39;a</span>, R: Read&lt;<span class="lifetime">&#39;de</span>&gt; + <span class="lifetime">&#39;a</span>&gt; de::VariantAccess&lt;<span class="lifetime">&#39;de</span>&gt; <span class="kw">for </span>VariantAccess&lt;<span class="lifetime">&#39;a</span>, R&gt; {
<span class="kw">type </span>Error = Error;
<span class="kw">fn </span>unit_variant(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
de::Deserialize::deserialize(<span class="self">self</span>.de)
}
<span class="kw">fn </span>newtype_variant_seed&lt;T&gt;(<span class="self">self</span>, seed: T) -&gt; <span class="prelude-ty">Result</span>&lt;T::Value&gt;
<span class="kw">where
</span>T: de::DeserializeSeed&lt;<span class="lifetime">&#39;de</span>&gt;,
{
seed.deserialize(<span class="self">self</span>.de)
}
<span class="kw">fn </span>tuple_variant&lt;V&gt;(<span class="self">self</span>, _len: usize, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
de::Deserializer::deserialize_seq(<span class="self">self</span>.de, visitor)
}
<span class="kw">fn </span>struct_variant&lt;V&gt;(<span class="self">self</span>, fields: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>[<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str], visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
de::Deserializer::deserialize_struct(<span class="self">self</span>.de, <span class="string">&quot;&quot;</span>, fields, visitor)
}
}
<span class="kw">struct </span>UnitVariantAccess&lt;<span class="lifetime">&#39;a</span>, R: <span class="lifetime">&#39;a</span>&gt; {
de: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>Deserializer&lt;R&gt;,
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, R: <span class="lifetime">&#39;a</span>&gt; UnitVariantAccess&lt;<span class="lifetime">&#39;a</span>, R&gt; {
<span class="kw">fn </span>new(de: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>Deserializer&lt;R&gt;) -&gt; <span class="self">Self </span>{
UnitVariantAccess { de }
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, <span class="lifetime">&#39;a</span>, R: Read&lt;<span class="lifetime">&#39;de</span>&gt; + <span class="lifetime">&#39;a</span>&gt; de::EnumAccess&lt;<span class="lifetime">&#39;de</span>&gt; <span class="kw">for </span>UnitVariantAccess&lt;<span class="lifetime">&#39;a</span>, R&gt; {
<span class="kw">type </span>Error = Error;
<span class="kw">type </span>Variant = <span class="self">Self</span>;
<span class="kw">fn </span>variant_seed&lt;V&gt;(<span class="self">self</span>, seed: V) -&gt; <span class="prelude-ty">Result</span>&lt;(V::Value, <span class="self">Self</span>)&gt;
<span class="kw">where
</span>V: de::DeserializeSeed&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span>variant = <span class="macro">tri!</span>(seed.deserialize(<span class="kw-2">&amp;mut *</span><span class="self">self</span>.de));
<span class="prelude-val">Ok</span>((variant, <span class="self">self</span>))
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, <span class="lifetime">&#39;a</span>, R: Read&lt;<span class="lifetime">&#39;de</span>&gt; + <span class="lifetime">&#39;a</span>&gt; de::VariantAccess&lt;<span class="lifetime">&#39;de</span>&gt; <span class="kw">for </span>UnitVariantAccess&lt;<span class="lifetime">&#39;a</span>, R&gt; {
<span class="kw">type </span>Error = Error;
<span class="kw">fn </span>unit_variant(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn </span>newtype_variant_seed&lt;T&gt;(<span class="self">self</span>, _seed: T) -&gt; <span class="prelude-ty">Result</span>&lt;T::Value&gt;
<span class="kw">where
</span>T: de::DeserializeSeed&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="prelude-val">Err</span>(de::Error::invalid_type(
Unexpected::UnitVariant,
<span class="kw-2">&amp;</span><span class="string">&quot;newtype variant&quot;</span>,
))
}
<span class="kw">fn </span>tuple_variant&lt;V&gt;(<span class="self">self</span>, _len: usize, _visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="prelude-val">Err</span>(de::Error::invalid_type(
Unexpected::UnitVariant,
<span class="kw-2">&amp;</span><span class="string">&quot;tuple variant&quot;</span>,
))
}
<span class="kw">fn </span>struct_variant&lt;V&gt;(<span class="self">self</span>, _fields: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>[<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str], _visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="prelude-val">Err</span>(de::Error::invalid_type(
Unexpected::UnitVariant,
<span class="kw-2">&amp;</span><span class="string">&quot;struct variant&quot;</span>,
))
}
}
<span class="doccomment">/// Only deserialize from this after peeking a &#39;&quot;&#39; byte! Otherwise it may
/// deserialize invalid JSON successfully.
</span><span class="kw">struct </span>MapKey&lt;<span class="lifetime">&#39;a</span>, R: <span class="lifetime">&#39;a</span>&gt; {
de: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>Deserializer&lt;R&gt;,
}
<span class="macro">macro_rules! </span>deserialize_integer_key {
(<span class="macro-nonterminal">$method</span>:ident =&gt; <span class="macro-nonterminal">$visit</span>:ident) =&gt; {
<span class="kw">fn </span><span class="macro-nonterminal">$method</span>&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.de.eat_char();
<span class="self">self</span>.de.scratch.clear();
<span class="kw">let </span>string = <span class="macro">tri!</span>(<span class="self">self</span>.de.read.parse_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>.de.scratch));
<span class="kw">match </span>(string.parse(), string) {
(<span class="prelude-val">Ok</span>(integer), <span class="kw">_</span>) =&gt; visitor.<span class="macro-nonterminal">$visit</span>(integer),
(<span class="prelude-val">Err</span>(<span class="kw">_</span>), Reference::Borrowed(s)) =&gt; visitor.visit_borrowed_str(s),
(<span class="prelude-val">Err</span>(<span class="kw">_</span>), Reference::Copied(s)) =&gt; visitor.visit_str(s),
}
}
};
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, <span class="lifetime">&#39;a</span>, R&gt; de::Deserializer&lt;<span class="lifetime">&#39;de</span>&gt; <span class="kw">for </span>MapKey&lt;<span class="lifetime">&#39;a</span>, R&gt;
<span class="kw">where
</span>R: Read&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">type </span>Error = Error;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>deserialize_any&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.de.eat_char();
<span class="self">self</span>.de.scratch.clear();
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.de.read.parse_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>.de.scratch)) {
Reference::Borrowed(s) =&gt; visitor.visit_borrowed_str(s),
Reference::Copied(s) =&gt; visitor.visit_str(s),
}
}
<span class="macro">deserialize_integer_key!</span>(deserialize_i8 =&gt; visit_i8);
<span class="macro">deserialize_integer_key!</span>(deserialize_i16 =&gt; visit_i16);
<span class="macro">deserialize_integer_key!</span>(deserialize_i32 =&gt; visit_i32);
<span class="macro">deserialize_integer_key!</span>(deserialize_i64 =&gt; visit_i64);
<span class="macro">deserialize_integer_key!</span>(deserialize_i128 =&gt; visit_i128);
<span class="macro">deserialize_integer_key!</span>(deserialize_u8 =&gt; visit_u8);
<span class="macro">deserialize_integer_key!</span>(deserialize_u16 =&gt; visit_u16);
<span class="macro">deserialize_integer_key!</span>(deserialize_u32 =&gt; visit_u32);
<span class="macro">deserialize_integer_key!</span>(deserialize_u64 =&gt; visit_u64);
<span class="macro">deserialize_integer_key!</span>(deserialize_u128 =&gt; visit_u128);
<span class="attribute">#[inline]
</span><span class="kw">fn </span>deserialize_option&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="comment">// Map keys cannot be null.
</span>visitor.visit_some(<span class="self">self</span>)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>deserialize_newtype_struct&lt;V&gt;(<span class="self">self</span>, name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="attribute">#[cfg(feature = <span class="string">&quot;raw_value&quot;</span>)]
</span>{
<span class="kw">if </span>name == <span class="kw">crate</span>::raw::TOKEN {
<span class="kw">return </span><span class="self">self</span>.de.deserialize_raw_value(visitor);
}
}
<span class="kw">let _ </span>= name;
visitor.visit_newtype_struct(<span class="self">self</span>)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>deserialize_enum&lt;V&gt;(
<span class="self">self</span>,
name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
variants: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>[<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str],
visitor: V,
) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.de.deserialize_enum(name, variants, visitor)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>deserialize_bytes&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.de.deserialize_bytes(visitor)
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>deserialize_byte_buf&lt;V&gt;(<span class="self">self</span>, visitor: V) -&gt; <span class="prelude-ty">Result</span>&lt;V::Value&gt;
<span class="kw">where
</span>V: de::Visitor&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="self">self</span>.de.deserialize_bytes(visitor)
}
<span class="macro">forward_to_deserialize_any! </span>{
bool f32 f64 char str string unit unit_struct seq tuple tuple_struct map
<span class="kw">struct </span>identifier ignored_any
}
}
<span class="comment">//////////////////////////////////////////////////////////////////////////////
</span><span class="doccomment">/// Iterator that deserializes a stream into multiple JSON values.
///
/// A stream deserializer can be created from any JSON deserializer using the
/// `Deserializer::into_iter` method.
///
/// The data can consist of any JSON value. Values need to be a self-delineating value e.g.
/// arrays, objects, or strings, or be followed by whitespace or a self-delineating value.
///
/// ```
/// use serde_json::{Deserializer, Value};
///
/// fn main() {
/// let data = &quot;{\&quot;k\&quot;: 3}1\&quot;cool\&quot;\&quot;stuff\&quot; 3{} [0, 1, 2]&quot;;
///
/// let stream = Deserializer::from_str(data).into_iter::&lt;Value&gt;();
///
/// for value in stream {
/// println!(&quot;{}&quot;, value.unwrap());
/// }
/// }
/// ```
</span><span class="kw">pub struct </span>StreamDeserializer&lt;<span class="lifetime">&#39;de</span>, R, T&gt; {
de: Deserializer&lt;R&gt;,
offset: usize,
failed: bool,
output: PhantomData&lt;T&gt;,
lifetime: PhantomData&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;de </span>()&gt;,
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, R, T&gt; StreamDeserializer&lt;<span class="lifetime">&#39;de</span>, R, T&gt;
<span class="kw">where
</span>R: read::Read&lt;<span class="lifetime">&#39;de</span>&gt;,
T: de::Deserialize&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="doccomment">/// Create a JSON stream deserializer from one of the possible serde_json
/// input sources.
///
/// Typically it is more convenient to use one of these methods instead:
///
/// - Deserializer::from_str(...).into_iter()
/// - Deserializer::from_slice(...).into_iter()
/// - Deserializer::from_reader(...).into_iter()
</span><span class="kw">pub fn </span>new(read: R) -&gt; <span class="self">Self </span>{
<span class="kw">let </span>offset = read.byte_offset();
StreamDeserializer {
de: Deserializer::new(read),
offset,
failed: <span class="bool-val">false</span>,
output: PhantomData,
lifetime: PhantomData,
}
}
<span class="doccomment">/// Returns the number of bytes so far deserialized into a successful `T`.
///
/// If a stream deserializer returns an EOF error, new data can be joined to
/// `old_data[stream.byte_offset()..]` to try again.
///
/// ```
/// let data = b&quot;[0] [1] [&quot;;
///
/// let de = serde_json::Deserializer::from_slice(data);
/// let mut stream = de.into_iter::&lt;Vec&lt;i32&gt;&gt;();
/// assert_eq!(0, stream.byte_offset());
///
/// println!(&quot;{:?}&quot;, stream.next()); // [0]
/// assert_eq!(3, stream.byte_offset());
///
/// println!(&quot;{:?}&quot;, stream.next()); // [1]
/// assert_eq!(7, stream.byte_offset());
///
/// println!(&quot;{:?}&quot;, stream.next()); // error
/// assert_eq!(8, stream.byte_offset());
///
/// // If err.is_eof(), can join the remaining data to new data and continue.
/// let remaining = &amp;data[stream.byte_offset()..];
/// ```
///
/// *Note:* In the future this method may be changed to return the number of
/// bytes so far deserialized into a successful T *or* syntactically valid
/// JSON skipped over due to a type error. See [serde-rs/json#70] for an
/// example illustrating this.
///
/// [serde-rs/json#70]: https://github.com/serde-rs/json/issues/70
</span><span class="kw">pub fn </span>byte_offset(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.offset
}
<span class="kw">fn </span>peek_end_of_value(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.de.peek()) {
<span class="prelude-val">Some</span>(<span class="string">b&#39; &#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">b&#39;\n&#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">b&#39;\t&#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">b&#39;\r&#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">b&#39;&quot;&#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">b&#39;[&#39;</span>)
| <span class="prelude-val">Some</span>(<span class="string">b&#39;]&#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">b&#39;{&#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">b&#39;}&#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">b&#39;,&#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">b&#39;:&#39;</span>) | <span class="prelude-val">None </span>=&gt; <span class="prelude-val">Ok</span>(()),
<span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; {
<span class="kw">let </span>position = <span class="self">self</span>.de.read.peek_position();
<span class="prelude-val">Err</span>(Error::syntax(
ErrorCode::TrailingCharacters,
position.line,
position.column,
))
}
}
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, R, T&gt; Iterator <span class="kw">for </span>StreamDeserializer&lt;<span class="lifetime">&#39;de</span>, R, T&gt;
<span class="kw">where
</span>R: Read&lt;<span class="lifetime">&#39;de</span>&gt;,
T: de::Deserialize&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">type </span>Item = <span class="prelude-ty">Result</span>&lt;T&gt;;
<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;<span class="prelude-ty">Result</span>&lt;T&gt;&gt; {
<span class="kw">if </span>R::should_early_return_if_failed &amp;&amp; <span class="self">self</span>.failed {
<span class="kw">return </span><span class="prelude-val">None</span>;
}
<span class="comment">// skip whitespaces, if any
// this helps with trailing whitespaces, since whitespaces between
// values are handled for us.
</span><span class="kw">match </span><span class="self">self</span>.de.parse_whitespace() {
<span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) =&gt; {
<span class="self">self</span>.offset = <span class="self">self</span>.de.read.byte_offset();
<span class="prelude-val">None
</span>}
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(b)) =&gt; {
<span class="comment">// If the value does not have a clear way to show the end of the value
// (like numbers, null, true etc.) we have to look for whitespace or
// the beginning of a self-delineated value.
</span><span class="kw">let </span>self_delineated_value = <span class="kw">match </span>b {
<span class="string">b&#39;[&#39; </span>| <span class="string">b&#39;&quot;&#39; </span>| <span class="string">b&#39;{&#39; </span>=&gt; <span class="bool-val">true</span>,
<span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
};
<span class="self">self</span>.offset = <span class="self">self</span>.de.read.byte_offset();
<span class="kw">let </span>result = de::Deserialize::deserialize(<span class="kw-2">&amp;mut </span><span class="self">self</span>.de);
<span class="prelude-val">Some</span>(<span class="kw">match </span>result {
<span class="prelude-val">Ok</span>(value) =&gt; {
<span class="self">self</span>.offset = <span class="self">self</span>.de.read.byte_offset();
<span class="kw">if </span>self_delineated_value {
<span class="prelude-val">Ok</span>(value)
} <span class="kw">else </span>{
<span class="self">self</span>.peek_end_of_value().map(|<span class="kw">_</span>| value)
}
}
<span class="prelude-val">Err</span>(e) =&gt; {
<span class="self">self</span>.de.read.set_failed(<span class="kw-2">&amp;mut </span><span class="self">self</span>.failed);
<span class="prelude-val">Err</span>(e)
}
})
}
<span class="prelude-val">Err</span>(e) =&gt; {
<span class="self">self</span>.de.read.set_failed(<span class="kw-2">&amp;mut </span><span class="self">self</span>.failed);
<span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(e))
}
}
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, R, T&gt; FusedIterator <span class="kw">for </span>StreamDeserializer&lt;<span class="lifetime">&#39;de</span>, R, T&gt;
<span class="kw">where
</span>R: Read&lt;<span class="lifetime">&#39;de</span>&gt; + Fused,
T: de::Deserialize&lt;<span class="lifetime">&#39;de</span>&gt;,
{
}
<span class="comment">//////////////////////////////////////////////////////////////////////////////
</span><span class="kw">fn </span>from_trait&lt;<span class="lifetime">&#39;de</span>, R, T&gt;(read: R) -&gt; <span class="prelude-ty">Result</span>&lt;T&gt;
<span class="kw">where
</span>R: Read&lt;<span class="lifetime">&#39;de</span>&gt;,
T: de::Deserialize&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span><span class="kw-2">mut </span>de = Deserializer::new(read);
<span class="kw">let </span>value = <span class="macro">tri!</span>(de::Deserialize::deserialize(<span class="kw-2">&amp;mut </span>de));
<span class="comment">// Make sure the whole stream has been consumed.
</span><span class="macro">tri!</span>(de.end());
<span class="prelude-val">Ok</span>(value)
}
<span class="doccomment">/// Deserialize an instance of type `T` from an IO stream of JSON.
///
/// The content of the IO stream is deserialized directly from the stream
/// without being buffered in memory by serde_json.
///
/// When reading from a source against which short reads are not efficient, such
/// as a [`File`], you will want to apply your own buffering because serde_json
/// will not buffer the input. See [`std::io::BufReader`].
///
/// It is expected that the input stream ends after the deserialized object.
/// If the stream does not end, such as in the case of a persistent socket connection,
/// this function will not return. It is possible instead to deserialize from a prefix of an input
/// stream without looking for EOF by managing your own [`Deserializer`].
///
/// Note that counter to intuition, this function is usually slower than
/// reading a file completely into memory and then applying [`from_str`]
/// or [`from_slice`] on it. See [issue #160].
///
/// [`File`]: https://doc.rust-lang.org/std/fs/struct.File.html
/// [`std::io::BufReader`]: https://doc.rust-lang.org/std/io/struct.BufReader.html
/// [`from_str`]: ./fn.from_str.html
/// [`from_slice`]: ./fn.from_slice.html
/// [issue #160]: https://github.com/serde-rs/json/issues/160
///
/// # Example
///
/// Reading the contents of a file.
///
/// ```
/// use serde::Deserialize;
///
/// use std::error::Error;
/// use std::fs::File;
/// use std::io::BufReader;
/// use std::path::Path;
///
/// #[derive(Deserialize, Debug)]
/// struct User {
/// fingerprint: String,
/// location: String,
/// }
///
/// fn read_user_from_file&lt;P: AsRef&lt;Path&gt;&gt;(path: P) -&gt; Result&lt;User, Box&lt;dyn Error&gt;&gt; {
/// // Open the file in read-only mode with buffer.
/// let file = File::open(path)?;
/// let reader = BufReader::new(file);
///
/// // Read the JSON contents of the file as an instance of `User`.
/// let u = serde_json::from_reader(reader)?;
///
/// // Return the `User`.
/// Ok(u)
/// }
///
/// fn main() {
/// # }
/// # fn fake_main() {
/// let u = read_user_from_file(&quot;test.json&quot;).unwrap();
/// println!(&quot;{:#?}&quot;, u);
/// }
/// ```
///
/// Reading from a persistent socket connection.
///
/// ```
/// use serde::Deserialize;
///
/// use std::error::Error;
/// use std::net::{TcpListener, TcpStream};
///
/// #[derive(Deserialize, Debug)]
/// struct User {
/// fingerprint: String,
/// location: String,
/// }
///
/// fn read_user_from_stream(tcp_stream: TcpStream) -&gt; Result&lt;User, Box&lt;dyn Error&gt;&gt; {
/// let mut de = serde_json::Deserializer::from_reader(tcp_stream);
/// let u = User::deserialize(&amp;mut de)?;
///
/// Ok(u)
/// }
///
/// fn main() {
/// # }
/// # fn fake_main() {
/// let listener = TcpListener::bind(&quot;127.0.0.1:4000&quot;).unwrap();
///
/// for stream in listener.incoming() {
/// println!(&quot;{:#?}&quot;, read_user_from_stream(stream.unwrap()));
/// }
/// }
/// ```
///
/// # Errors
///
/// This conversion can fail if the structure of the input does not match the
/// structure expected by `T`, for example if `T` is a struct type but the input
/// contains something other than a JSON map. It can also fail if the structure
/// is correct but `T`&#39;s implementation of `Deserialize` decides that something
/// is wrong with the data, for example required struct fields are missing from
/// the JSON map or some number is too big to fit in the expected primitive
/// type.
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;std&quot;</span>)))]
</span><span class="kw">pub fn </span>from_reader&lt;R, T&gt;(rdr: R) -&gt; <span class="prelude-ty">Result</span>&lt;T&gt;
<span class="kw">where
</span>R: <span class="kw">crate</span>::io::Read,
T: de::DeserializeOwned,
{
from_trait(read::IoRead::new(rdr))
}
<span class="doccomment">/// Deserialize an instance of type `T` from bytes of JSON text.
///
/// # Example
///
/// ```
/// use serde::Deserialize;
///
/// #[derive(Deserialize, Debug)]
/// struct User {
/// fingerprint: String,
/// location: String,
/// }
///
/// fn main() {
/// // The type of `j` is `&amp;[u8]`
/// let j = b&quot;
/// {
/// \&quot;fingerprint\&quot;: \&quot;0xF9BA143B95FF6D82\&quot;,
/// \&quot;location\&quot;: \&quot;Menlo Park, CA\&quot;
/// }&quot;;
///
/// let u: User = serde_json::from_slice(j).unwrap();
/// println!(&quot;{:#?}&quot;, u);
/// }
/// ```
///
/// # Errors
///
/// This conversion can fail if the structure of the input does not match the
/// structure expected by `T`, for example if `T` is a struct type but the input
/// contains something other than a JSON map. It can also fail if the structure
/// is correct but `T`&#39;s implementation of `Deserialize` decides that something
/// is wrong with the data, for example required struct fields are missing from
/// the JSON map or some number is too big to fit in the expected primitive
/// type.
</span><span class="kw">pub fn </span>from_slice&lt;<span class="lifetime">&#39;a</span>, T&gt;(v: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;T&gt;
<span class="kw">where
</span>T: de::Deserialize&lt;<span class="lifetime">&#39;a</span>&gt;,
{
from_trait(read::SliceRead::new(v))
}
<span class="doccomment">/// Deserialize an instance of type `T` from a string of JSON text.
///
/// # Example
///
/// ```
/// use serde::Deserialize;
///
/// #[derive(Deserialize, Debug)]
/// struct User {
/// fingerprint: String,
/// location: String,
/// }
///
/// fn main() {
/// // The type of `j` is `&amp;str`
/// let j = &quot;
/// {
/// \&quot;fingerprint\&quot;: \&quot;0xF9BA143B95FF6D82\&quot;,
/// \&quot;location\&quot;: \&quot;Menlo Park, CA\&quot;
/// }&quot;;
///
/// let u: User = serde_json::from_str(j).unwrap();
/// println!(&quot;{:#?}&quot;, u);
/// }
/// ```
///
/// # Errors
///
/// This conversion can fail if the structure of the input does not match the
/// structure expected by `T`, for example if `T` is a struct type but the input
/// contains something other than a JSON map. It can also fail if the structure
/// is correct but `T`&#39;s implementation of `Deserialize` decides that something
/// is wrong with the data, for example required struct fields are missing from
/// the JSON map or some number is too big to fit in the expected primitive
/// type.
</span><span class="kw">pub fn </span>from_str&lt;<span class="lifetime">&#39;a</span>, T&gt;(s: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str) -&gt; <span class="prelude-ty">Result</span>&lt;T&gt;
<span class="kw">where
</span>T: de::Deserialize&lt;<span class="lifetime">&#39;a</span>&gt;,
{
from_trait(read::StrRead::new(s))
}
</code></pre></div>
</section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>