| <!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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| <span id="2500">2500</span> |
| <span id="2501">2501</span> |
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| <span id="2580">2580</span> |
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| <span id="2582">2582</span> |
| <span id="2583">2583</span> |
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| <span id="2585">2585</span> |
| <span id="2586">2586</span> |
| <span id="2587">2587</span> |
| <span id="2588">2588</span> |
| <span id="2589">2589</span> |
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| <span id="2591">2591</span> |
| <span id="2592">2592</span> |
| <span id="2593">2593</span> |
| <span id="2594">2594</span> |
| <span id="2595">2595</span> |
| <span id="2596">2596</span> |
| <span id="2597">2597</span> |
| <span id="2598">2598</span> |
| <span id="2599">2599</span> |
| <span id="2600">2600</span> |
| <span id="2601">2601</span> |
| <span id="2602">2602</span> |
| <span id="2603">2603</span> |
| <span id="2604">2604</span> |
| <span id="2605">2605</span> |
| <span id="2606">2606</span> |
| </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">"float_roundtrip"</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">"float_roundtrip"</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">"arbitrary_precision"</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">"std"</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<R> { |
| read: R, |
| scratch: Vec<u8>, |
| remaining_depth: u8, |
| <span class="attribute">#[cfg(feature = <span class="string">"float_roundtrip"</span>)] |
| </span>single_precision: bool, |
| <span class="attribute">#[cfg(feature = <span class="string">"unbounded_depth"</span>)] |
| </span>disable_recursion_limit: bool, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'de</span>, R> Deserializer<R> |
| <span class="kw">where |
| </span>R: read::Read<<span class="lifetime">'de</span>>, |
| { |
| <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) -> <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">"float_roundtrip"</span>)] |
| </span>single_precision: <span class="bool-val">false</span>, |
| <span class="attribute">#[cfg(feature = <span class="string">"unbounded_depth"</span>)] |
| </span>disable_recursion_limit: <span class="bool-val">false</span>, |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">impl</span><R> Deserializer<read::IoRead<R>> |
| <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 `&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) -> <span class="self">Self </span>{ |
| Deserializer::new(read::IoRead::new(reader)) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Deserializer<read::SliceRead<<span class="lifetime">'a</span>>> { |
| <span class="doccomment">/// Creates a JSON deserializer from a `&[u8]`. |
| </span><span class="kw">pub fn </span>from_slice(bytes: <span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> <span class="self">Self </span>{ |
| Deserializer::new(read::SliceRead::new(bytes)) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Deserializer<read::StrRead<<span class="lifetime">'a</span>>> { |
| <span class="doccomment">/// Creates a JSON deserializer from a `&str`. |
| </span><span class="kw">pub fn </span>from_str(s: <span class="kw-2">&</span><span class="lifetime">'a </span>str) -> <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">$c</span>:expr) => { |
| <span class="kw">match </span><span class="macro-nonterminal">$c </span>{ |
| c => <span class="macro-nonterminal">$a </span>>= c / <span class="number">10 </span>&& (<span class="macro-nonterminal">$a </span>> c / <span class="number">10 </span>|| <span class="macro-nonterminal">$b </span>> 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">"arbitrary_precision"</span>)] |
| </span>String(String), |
| } |
| |
| <span class="kw">impl </span>ParserNumber { |
| <span class="kw">fn </span>visit<<span class="lifetime">'de</span>, V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| ParserNumber::F64(x) => visitor.visit_f64(x), |
| ParserNumber::U64(x) => visitor.visit_u64(x), |
| ParserNumber::I64(x) => visitor.visit_i64(x), |
| <span class="attribute">#[cfg(feature = <span class="string">"arbitrary_precision"</span>)] |
| </span>ParserNumber::String(x) => visitor.visit_map(NumberDeserializer { number: x.into() }), |
| } |
| } |
| |
| <span class="kw">fn </span>invalid_type(<span class="self">self</span>, exp: <span class="kw-2">&</span><span class="kw">dyn </span>Expected) -> Error { |
| <span class="kw">match </span><span class="self">self </span>{ |
| ParserNumber::F64(x) => de::Error::invalid_type(Unexpected::Float(x), exp), |
| ParserNumber::U64(x) => de::Error::invalid_type(Unexpected::Unsigned(x), exp), |
| ParserNumber::I64(x) => de::Error::invalid_type(Unexpected::Signed(x), exp), |
| <span class="attribute">#[cfg(feature = <span class="string">"arbitrary_precision"</span>)] |
| </span>ParserNumber::String(<span class="kw">_</span>) => de::Error::invalid_type(Unexpected::Other(<span class="string">"number"</span>), exp), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'de</span>, R: Read<<span class="lifetime">'de</span>>> Deserializer<R> { |
| <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">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</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="kw">_</span>) => <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::TrailingCharacters)), |
| <span class="prelude-val">None </span>=> <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<T>(<span class="self">self</span>) -> StreamDeserializer<<span class="lifetime">'de</span>, R, T> |
| <span class="kw">where |
| </span>T: de::Deserialize<<span class="lifetime">'de</span>>, |
| { |
| <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 |
| /// `"unbounded_depth"` feature.* |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use serde::Deserialize; |
| /// use serde_json::Value; |
| /// |
| /// fn main() { |
| /// let mut json = String::new(); |
| /// for _ in 0..10000 { |
| /// json = format!("[{}]", json); |
| /// } |
| /// |
| /// let mut deserializer = serde_json::Deserializer::from_str(&json); |
| /// deserializer.disable_recursion_limit(); |
| /// let deserializer = serde_stacker::Deserializer::new(&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">"unbounded_depth"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"unbounded_depth"</span>)))] |
| </span><span class="kw">pub fn </span>disable_recursion_limit(<span class="kw-2">&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">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><u8>> { |
| <span class="self">self</span>.read.peek() |
| } |
| |
| <span class="kw">fn </span>peek_or_null(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><u8> { |
| <span class="prelude-val">Ok</span>(<span class="macro">tri!</span>(<span class="self">self</span>.peek()).unwrap_or(<span class="string">b'\x00'</span>)) |
| } |
| |
| <span class="kw">fn </span>eat_char(<span class="kw-2">&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">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><u8>> { |
| <span class="self">self</span>.read.next() |
| } |
| |
| <span class="kw">fn </span>next_char_or_null(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><u8> { |
| <span class="prelude-val">Ok</span>(<span class="macro">tri!</span>(<span class="self">self</span>.next_char()).unwrap_or(<span class="string">b'\x00'</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">&</span><span class="self">self</span>, reason: ErrorCode) -> 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">&</span><span class="self">self</span>, reason: ErrorCode) -> 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">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><u8>> { |
| <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' '</span>) | <span class="prelude-val">Some</span>(<span class="string">b'\n'</span>) | <span class="prelude-val">Some</span>(<span class="string">b'\t'</span>) | <span class="prelude-val">Some</span>(<span class="string">b'\r'</span>) => { |
| <span class="self">self</span>.eat_char(); |
| } |
| other => { |
| <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">&mut </span><span class="self">self</span>, exp: <span class="kw-2">&</span><span class="kw">dyn </span>Expected) -> 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'\x00'</span>) { |
| <span class="string">b'n' </span>=> { |
| <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"ull"</span>) { |
| <span class="kw">return </span>err; |
| } |
| de::Error::invalid_type(Unexpected::Unit, exp) |
| } |
| <span class="string">b't' </span>=> { |
| <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"rue"</span>) { |
| <span class="kw">return </span>err; |
| } |
| de::Error::invalid_type(Unexpected::Bool(<span class="bool-val">true</span>), exp) |
| } |
| <span class="string">b'f' </span>=> { |
| <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"alse"</span>) { |
| <span class="kw">return </span>err; |
| } |
| de::Error::invalid_type(Unexpected::Bool(<span class="bool-val">false</span>), exp) |
| } |
| <span class="string">b'-' </span>=> { |
| <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) => n.invalid_type(exp), |
| <span class="prelude-val">Err</span>(err) => <span class="kw">return </span>err, |
| } |
| } |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> <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) => n.invalid_type(exp), |
| <span class="prelude-val">Err</span>(err) => <span class="kw">return </span>err, |
| }, |
| <span class="string">b'"' </span>=> { |
| <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">&mut </span><span class="self">self</span>.scratch) { |
| <span class="prelude-val">Ok</span>(s) => de::Error::invalid_type(Unexpected::Str(<span class="kw-2">&</span>s), exp), |
| <span class="prelude-val">Err</span>(err) => <span class="kw">return </span>err, |
| } |
| } |
| <span class="string">b'[' </span>=> de::Error::invalid_type(Unexpected::Seq, exp), |
| <span class="string">b'{' </span>=> de::Error::invalid_type(Unexpected::Map, exp), |
| <span class="kw">_ </span>=> <span class="self">self</span>.peek_error(ErrorCode::ExpectedSomeValue), |
| }; |
| |
| <span class="self">self</span>.fix_position(err) |
| } |
| |
| <span class="kw">fn </span>deserialize_number<V>(<span class="kw-2">&mut </span><span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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'-' </span>=> { |
| <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'0'</span>..=<span class="string">b'9' </span>=> <span class="macro">tri!</span>(<span class="self">self</span>.parse_integer(<span class="bool-val">true</span>)).visit(visitor), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&</span>visitor)), |
| }; |
| |
| <span class="kw">match </span>value { |
| <span class="prelude-val">Ok</span>(value) => <span class="prelude-val">Ok</span>(value), |
| <span class="prelude-val">Err</span>(err) => <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">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>String) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.next_char_or_null()) { |
| <span class="string">b'0' </span>=> { |
| buf.push(<span class="string">'0'</span>); |
| <span class="comment">// There can be only one leading '0'. |
| </span><span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) { |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber)), |
| <span class="kw">_ </span>=> <span class="prelude-val">Ok</span>(()), |
| } |
| } |
| c @ <span class="string">b'1'</span>..=<span class="string">b'9' </span>=> { |
| buf.push(c <span class="kw">as </span>char); |
| <span class="kw">while let </span>c @ <span class="string">b'0'</span>..=<span class="string">b'9' </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>=> <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">&</span><span class="self">self</span>, err: Error) -> 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">&mut </span><span class="self">self</span>, ident: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><()> { |
| <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>=> { |
| <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) => { |
| <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">&mut </span><span class="self">self</span>, positive: bool) -> <span class="prelude-ty">Result</span><ParserNumber> { |
| <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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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'0' </span>=> { |
| <span class="comment">// There can be only one leading '0'. |
| </span><span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) { |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber)), |
| <span class="kw">_ </span>=> <span class="self">self</span>.parse_number(positive, <span class="number">0</span>), |
| } |
| } |
| c @ <span class="string">b'1'</span>..=<span class="string">b'9' </span>=> { |
| <span class="kw">let </span><span class="kw-2">mut </span>significand = (c - <span class="string">b'0'</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'0'</span>..=<span class="string">b'9' </span>=> { |
| <span class="kw">let </span>digit = (c - <span class="string">b'0'</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>=> { |
| <span class="kw">return </span><span class="self">self</span>.parse_number(positive, significand); |
| } |
| } |
| } |
| } |
| <span class="kw">_ </span>=> <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">&mut </span><span class="self">self</span>, positive: bool, significand: u64) -> <span class="prelude-ty">Result</span><ParserNumber> { |
| <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'.' </span>=> 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'e' </span>| <span class="string">b'E' </span>=> 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>=> { |
| <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 >= <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">&mut </span><span class="self">self</span>, |
| positive: bool, |
| <span class="kw-2">mut </span>significand: u64, |
| exponent_before_decimal_point: i32, |
| ) -> <span class="prelude-ty">Result</span><f64> { |
| <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'0'</span>..=<span class="string">b'9' </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'0'</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>) => <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>=> <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'e' </span>| <span class="string">b'E' </span>=> <span class="self">self</span>.parse_exponent(positive, significand, exponent), |
| <span class="kw">_ </span>=> <span class="self">self</span>.f64_from_parts(positive, significand, exponent), |
| } |
| } |
| |
| <span class="kw">fn </span>parse_exponent( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| positive: bool, |
| significand: u64, |
| starting_exp: i32, |
| ) -> <span class="prelude-ty">Result</span><f64> { |
| <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'+' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| <span class="bool-val">true |
| </span>} |
| <span class="string">b'-' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| <span class="bool-val">false |
| </span>} |
| <span class="kw">_ </span>=> <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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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'0'</span>..=<span class="string">b'9' </span>=> (c - <span class="string">b'0'</span>) <span class="kw">as </span>i32, |
| <span class="kw">_ </span>=> { |
| <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'0'</span>..=<span class="string">b'9' </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'0'</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">"float_roundtrip"</span>)] |
| </span><span class="kw">fn </span>f64_from_parts(<span class="kw-2">&mut </span><span class="self">self</span>, positive: bool, significand: u64, exponent: i32) -> <span class="prelude-ty">Result</span><f64> { |
| <span class="kw">let </span>f = <span class="kw">if </span><span class="self">self</span>.single_precision { |
| lexical::parse_concise_float::<f32>(significand, exponent) <span class="kw">as </span>f64 |
| } <span class="kw">else </span>{ |
| lexical::parse_concise_float::<f64>(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">"float_roundtrip"</span>))] |
| </span><span class="kw">fn </span>f64_from_parts( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| positive: bool, |
| significand: u64, |
| <span class="kw-2">mut </span>exponent: i32, |
| ) -> <span class="prelude-ty">Result</span><f64> { |
| <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">&</span>pow) => { |
| <span class="kw">if </span>exponent >= <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>=> { |
| <span class="kw">if </span>f == <span class="number">0.0 </span>{ |
| <span class="kw">break</span>; |
| } |
| <span class="kw">if </span>exponent >= <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">"float_roundtrip"</span>)] |
| #[cold] |
| #[inline(never)] |
| </span><span class="kw">fn </span>parse_long_integer(<span class="kw-2">&mut </span><span class="self">self</span>, positive: bool, partial_significand: u64) -> <span class="prelude-ty">Result</span><f64> { |
| <span class="comment">// To deserialize floats we'll first push the integer and fraction |
| // parts, both as byte strings, into the scratch buffer and then feed |
| // both slices to lexical's parser. For example if the input is |
| // `12.34e5` we'll push b"1234" into scratch and then pass b"12" and |
| // b"34" 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'0'</span>..=<span class="string">b'9' </span>=> { |
| <span class="self">self</span>.scratch.push(c); |
| <span class="self">self</span>.eat_char(); |
| } |
| <span class="string">b'.' </span>=> { |
| <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'e' </span>| <span class="string">b'E' </span>=> { |
| <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>=> { |
| <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">"float_roundtrip"</span>))] |
| #[cold] |
| #[inline(never)] |
| </span><span class="kw">fn </span>parse_long_integer(<span class="kw-2">&mut </span><span class="self">self</span>, positive: bool, significand: u64) -> <span class="prelude-ty">Result</span><f64> { |
| <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'0'</span>..=<span class="string">b'9' </span>=> { |
| <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'.' </span>=> { |
| <span class="kw">return </span><span class="self">self</span>.parse_decimal(positive, significand, exponent); |
| } |
| <span class="string">b'e' </span>| <span class="string">b'E' </span>=> { |
| <span class="kw">return </span><span class="self">self</span>.parse_exponent(positive, significand, exponent); |
| } |
| <span class="kw">_ </span>=> { |
| <span class="kw">return </span><span class="self">self</span>.f64_from_parts(positive, significand, exponent); |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"float_roundtrip"</span>)] |
| #[cold] |
| </span><span class="kw">fn </span>parse_long_decimal(<span class="kw-2">&mut </span><span class="self">self</span>, positive: bool, integer_end: usize) -> <span class="prelude-ty">Result</span><f64> { |
| <span class="kw">let </span><span class="kw-2">mut </span>at_least_one_digit = integer_end < <span class="self">self</span>.scratch.len(); |
| <span class="kw">while let </span>c @ <span class="string">b'0'</span>..=<span class="string">b'9' </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>) => <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>=> <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'e' </span>| <span class="string">b'E' </span>=> <span class="self">self</span>.parse_long_exponent(positive, integer_end), |
| <span class="kw">_ </span>=> <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">"float_roundtrip"</span>)] |
| </span><span class="kw">fn </span>parse_long_exponent(<span class="kw-2">&mut </span><span class="self">self</span>, positive: bool, integer_end: usize) -> <span class="prelude-ty">Result</span><f64> { |
| <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'+' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| <span class="bool-val">true |
| </span>} |
| <span class="string">b'-' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| <span class="bool-val">false |
| </span>} |
| <span class="kw">_ </span>=> <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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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'0'</span>..=<span class="string">b'9' </span>=> (c - <span class="string">b'0'</span>) <span class="kw">as </span>i32, |
| <span class="kw">_ </span>=> { |
| <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'0'</span>..=<span class="string">b'9' </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'0'</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">&</span>digit| digit == <span class="string">b'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 { 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">"float_roundtrip"</span>)] |
| #[cold] |
| #[inline(never)] |
| </span><span class="kw">fn </span>parse_decimal_overflow( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| positive: bool, |
| significand: u64, |
| exponent: i32, |
| ) -> <span class="prelude-ty">Result</span><f64> { |
| <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'0'</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">"float_roundtrip"</span>))] |
| #[cold] |
| #[inline(never)] |
| </span><span class="kw">fn </span>parse_decimal_overflow( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| positive: bool, |
| significand: u64, |
| exponent: i32, |
| ) -> <span class="prelude-ty">Result</span><f64> { |
| <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'0'</span>..=<span class="string">b'9' </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'e' </span>| <span class="string">b'E' </span>=> <span class="self">self</span>.parse_exponent(positive, significand, exponent), |
| <span class="kw">_ </span>=> <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">&mut </span><span class="self">self</span>, |
| positive: bool, |
| zero_significand: bool, |
| positive_exp: bool, |
| ) -> <span class="prelude-ty">Result</span><f64> { |
| <span class="comment">// Error instead of +/- infinity. |
| </span><span class="kw">if </span>!zero_significand && 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'0'</span>..=<span class="string">b'9' </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">"float_roundtrip"</span>)] |
| </span><span class="kw">fn </span>f64_long_from_parts( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| positive: bool, |
| integer_end: usize, |
| exponent: i32, |
| ) -> <span class="prelude-ty">Result</span><f64> { |
| <span class="kw">let </span>integer = <span class="kw-2">&</span><span class="self">self</span>.scratch[..integer_end]; |
| <span class="kw">let </span>fraction = <span class="kw-2">&</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::<f32>(integer, fraction, exponent) <span class="kw">as </span>f64 |
| } <span class="kw">else </span>{ |
| lexical::parse_truncated_float::<f64>(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">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><ParserNumber> { |
| <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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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'-' </span>=> { |
| <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'0'</span>..=<span class="string">b'9' </span>=> <span class="self">self</span>.parse_any_number(<span class="bool-val">true</span>), |
| <span class="kw">_ </span>=> <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>) => <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber)), |
| <span class="prelude-val">None </span>=> value, |
| }; |
| |
| <span class="kw">match </span>value { |
| <span class="prelude-val">Ok</span>(value) => <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) => <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)), |
| } |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"arbitrary_precision"</span>))] |
| </span><span class="kw">fn </span>parse_any_number(<span class="kw-2">&mut </span><span class="self">self</span>, positive: bool) -> <span class="prelude-ty">Result</span><ParserNumber> { |
| <span class="self">self</span>.parse_integer(positive) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"arbitrary_precision"</span>)] |
| </span><span class="kw">fn </span>parse_any_number(<span class="kw-2">&mut </span><span class="self">self</span>, positive: bool) -> <span class="prelude-ty">Result</span><ParserNumber> { |
| <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">'-'</span>); |
| } |
| <span class="self">self</span>.scan_integer(<span class="kw-2">&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">"arbitrary_precision"</span>)] |
| </span><span class="kw">fn </span>scan_or_eof(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>String) -> <span class="prelude-ty">Result</span><u8> { |
| <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.next_char()) { |
| <span class="prelude-val">Some</span>(b) => { |
| buf.push(b <span class="kw">as </span>char); |
| <span class="prelude-val">Ok</span>(b) |
| } |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::EofWhileParsingValue)), |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"arbitrary_precision"</span>)] |
| </span><span class="kw">fn </span>scan_integer(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>String) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.scan_or_eof(buf)) { |
| <span class="string">b'0' </span>=> { |
| <span class="comment">// There can be only one leading '0'. |
| </span><span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) { |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::InvalidNumber)), |
| <span class="kw">_ </span>=> <span class="self">self</span>.scan_number(buf), |
| } |
| } |
| <span class="string">b'1'</span>..=<span class="string">b'9' </span>=> <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'0'</span>..=<span class="string">b'9' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| buf.push(c <span class="kw">as </span>char); |
| } |
| <span class="kw">_ </span>=> { |
| <span class="kw">return </span><span class="self">self</span>.scan_number(buf); |
| } |
| } |
| }, |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::InvalidNumber)), |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"arbitrary_precision"</span>)] |
| </span><span class="kw">fn </span>scan_number(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>String) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.peek_or_null()) { |
| <span class="string">b'.' </span>=> <span class="self">self</span>.scan_decimal(buf), |
| e @ <span class="string">b'e' </span>| e @ <span class="string">b'E' </span>=> <span class="self">self</span>.scan_exponent(e <span class="kw">as </span>char, buf), |
| <span class="kw">_ </span>=> <span class="prelude-val">Ok</span>(()), |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"arbitrary_precision"</span>)] |
| </span><span class="kw">fn </span>scan_decimal(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>String) -> <span class="prelude-ty">Result</span><()> { |
| <span class="self">self</span>.eat_char(); |
| buf.push(<span class="string">'.'</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'0'</span>..=<span class="string">b'9' </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>) => <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>=> <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'e' </span>| e @ <span class="string">b'E' </span>=> <span class="self">self</span>.scan_exponent(e <span class="kw">as </span>char, buf), |
| <span class="kw">_ </span>=> <span class="prelude-val">Ok</span>(()), |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"arbitrary_precision"</span>)] |
| </span><span class="kw">fn </span>scan_exponent(<span class="kw-2">&mut </span><span class="self">self</span>, e: char, buf: <span class="kw-2">&mut </span>String) -> <span class="prelude-ty">Result</span><()> { |
| <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'+' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| buf.push(<span class="string">'+'</span>); |
| } |
| <span class="string">b'-' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| buf.push(<span class="string">'-'</span>); |
| } |
| <span class="kw">_ </span>=> {} |
| } |
| |
| <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'0'</span>..=<span class="string">b'9' </span>=> {} |
| <span class="kw">_ </span>=> { |
| <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'0'</span>..=<span class="string">b'9' </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">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</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':'</span>) => { |
| <span class="self">self</span>.eat_char(); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::ExpectedColon)), |
| <span class="prelude-val">None </span>=> <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">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</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']'</span>) => { |
| <span class="self">self</span>.eat_char(); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="prelude-val">Some</span>(<span class="string">b','</span>) => { |
| <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']'</span>)) => <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::TrailingComma)), |
| <span class="kw">_ </span>=> <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>) => <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::TrailingCharacters)), |
| <span class="prelude-val">None </span>=> <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">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</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'}'</span>) => { |
| <span class="self">self</span>.eat_char(); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="prelude-val">Some</span>(<span class="string">b','</span>) => <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>) => <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::TrailingCharacters)), |
| <span class="prelude-val">None </span>=> <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">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| <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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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'n' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| <span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b"ull"</span>)); |
| <span class="prelude-val">None |
| </span>} |
| <span class="string">b't' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| <span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b"rue"</span>)); |
| <span class="prelude-val">None |
| </span>} |
| <span class="string">b'f' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| <span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b"alse"</span>)); |
| <span class="prelude-val">None |
| </span>} |
| <span class="string">b'-' </span>=> { |
| <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'0'</span>..=<span class="string">b'9' </span>=> { |
| <span class="macro">tri!</span>(<span class="self">self</span>.ignore_integer()); |
| <span class="prelude-val">None |
| </span>} |
| <span class="string">b'"' </span>=> { |
| <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'[' </span>| frame @ <span class="string">b'{' </span>=> { |
| <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>=> <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) => (<span class="bool-val">false</span>, frame), |
| <span class="prelude-val">None </span>=> <span class="kw">match </span>enclosing.take() { |
| <span class="prelude-val">Some</span>(frame) => (<span class="bool-val">true</span>, frame), |
| <span class="prelude-val">None </span>=> <span class="kw">match </span><span class="self">self</span>.scratch.pop() { |
| <span class="prelude-val">Some</span>(frame) => (<span class="bool-val">true</span>, frame), |
| <span class="prelude-val">None </span>=> <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','</span>) <span class="kw">if </span>accept_comma => { |
| <span class="self">self</span>.eat_char(); |
| <span class="kw">break</span>; |
| } |
| <span class="prelude-val">Some</span>(<span class="string">b']'</span>) <span class="kw">if </span>frame == <span class="string">b'[' </span>=> {} |
| <span class="prelude-val">Some</span>(<span class="string">b'}'</span>) <span class="kw">if </span>frame == <span class="string">b'{' </span>=> {} |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => { |
| <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'[' </span>=> ErrorCode::ExpectedListCommaOrEnd, |
| <span class="string">b'{' </span>=> ErrorCode::ExpectedObjectCommaOrEnd, |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| })); |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="prelude-val">None </span>=> { |
| <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'[' </span>=> ErrorCode::EofWhileParsingList, |
| <span class="string">b'{' </span>=> ErrorCode::EofWhileParsingObject, |
| <span class="kw">_ </span>=> <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) => frame, |
| <span class="prelude-val">None </span>=> <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'{' </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'"'</span>) => <span class="self">self</span>.eat_char(), |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => <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>=> <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':'</span>) => <span class="self">self</span>.eat_char(), |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => <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>=> <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">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">match </span><span class="macro">tri!</span>(<span class="self">self</span>.next_char_or_null()) { |
| <span class="string">b'0' </span>=> { |
| <span class="comment">// There can be only one leading '0'. |
| </span><span class="kw">if let </span><span class="string">b'0'</span>..=<span class="string">b'9' </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'1'</span>..=<span class="string">b'9' </span>=> { |
| <span class="kw">while let </span><span class="string">b'0'</span>..=<span class="string">b'9' </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>=> { |
| <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'.' </span>=> <span class="self">self</span>.ignore_decimal(), |
| <span class="string">b'e' </span>| <span class="string">b'E' </span>=> <span class="self">self</span>.ignore_exponent(), |
| <span class="kw">_ </span>=> <span class="prelude-val">Ok</span>(()), |
| } |
| } |
| |
| <span class="kw">fn </span>ignore_decimal(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| <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'0'</span>..=<span class="string">b'9' </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'e' </span>| <span class="string">b'E' </span>=> <span class="self">self</span>.ignore_exponent(), |
| <span class="kw">_ </span>=> <span class="prelude-val">Ok</span>(()), |
| } |
| } |
| |
| <span class="kw">fn </span>ignore_exponent(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| <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'+' </span>| <span class="string">b'-' </span>=> <span class="self">self</span>.eat_char(), |
| <span class="kw">_ </span>=> {} |
| } |
| |
| <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'0'</span>..=<span class="string">b'9' </span>=> {} |
| <span class="kw">_ </span>=> { |
| <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'0'</span>..=<span class="string">b'9' </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">"raw_value"</span>)] |
| </span><span class="kw">fn </span>deserialize_raw_value<V>(<span class="kw-2">&mut </span><span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <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">&</span>str) -> result::Result<<span class="self">Self</span>, <span class="self">Self</span>::Err> { |
| Deserializer::from_str(s) |
| .parse_any_signed_number() |
| .map(Into::into) |
| } |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"float_roundtrip"</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) => { |
| <span class="kw">fn </span><span class="macro-nonterminal">$method</span><V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="self">self</span>.deserialize_number(visitor) |
| } |
| }; |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"unbounded_depth"</span>))] |
| </span><span class="macro">macro_rules! </span>if_checking_recursion_limit { |
| ($(<span class="macro-nonterminal">$body</span>:tt)<span class="kw-2">*</span>) => { |
| $(<span class="macro-nonterminal">$body</span>)* |
| }; |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unbounded_depth"</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>) => { |
| <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>) => { |
| <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><<span class="lifetime">'de</span>, <span class="lifetime">'a</span>, R: Read<<span class="lifetime">'de</span>>> de::Deserializer<<span class="lifetime">'de</span>> <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Deserializer<R> { |
| <span class="kw">type </span>Error = Error; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deserialize_any<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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'n' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| <span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b"ull"</span>)); |
| visitor.visit_unit() |
| } |
| <span class="string">b't' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| <span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b"rue"</span>)); |
| visitor.visit_bool(<span class="bool-val">true</span>) |
| } |
| <span class="string">b'f' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| <span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b"alse"</span>)); |
| visitor.visit_bool(<span class="bool-val">false</span>) |
| } |
| <span class="string">b'-' </span>=> { |
| <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'0'</span>..=<span class="string">b'9' </span>=> <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'"' </span>=> { |
| <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">&mut </span><span class="self">self</span>.scratch)) { |
| Reference::Borrowed(s) => visitor.visit_borrowed_str(s), |
| Reference::Copied(s) => visitor.visit_str(s), |
| } |
| } |
| <span class="string">b'[' </span>=> { |
| <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>(())) => <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)) => <span class="prelude-val">Err</span>(err), |
| } |
| } |
| <span class="string">b'{' </span>=> { |
| <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>(())) => <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)) => <span class="prelude-val">Err</span>(err), |
| } |
| } |
| <span class="kw">_ </span>=> <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) => <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) => <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)), |
| } |
| } |
| |
| <span class="kw">fn </span>deserialize_bool<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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't' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| <span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b"rue"</span>)); |
| visitor.visit_bool(<span class="bool-val">true</span>) |
| } |
| <span class="string">b'f' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| <span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b"alse"</span>)); |
| visitor.visit_bool(<span class="bool-val">false</span>) |
| } |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&</span>visitor)), |
| }; |
| |
| <span class="kw">match </span>value { |
| <span class="prelude-val">Ok</span>(value) => <span class="prelude-val">Ok</span>(value), |
| <span class="prelude-val">Err</span>(err) => <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">"float_roundtrip"</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">"float_roundtrip"</span>)] |
| </span><span class="kw">fn </span>deserialize_f32<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <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<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <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'-'</span>) => { |
| <span class="self">self</span>.eat_char(); |
| buf.push(<span class="string">'-'</span>); |
| } |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => {} |
| <span class="prelude-val">None </span>=> { |
| <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">&mut </span>buf)); |
| |
| <span class="kw">let </span>value = <span class="kw">match </span>buf.parse() { |
| <span class="prelude-val">Ok</span>(int) => visitor.visit_i128(int), |
| <span class="prelude-val">Err</span>(<span class="kw">_</span>) => { |
| <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) => <span class="prelude-val">Ok</span>(value), |
| <span class="prelude-val">Err</span>(err) => <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)), |
| } |
| } |
| |
| <span class="kw">fn </span>deserialize_u128<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</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'-'</span>) => { |
| <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>) => {} |
| <span class="prelude-val">None </span>=> { |
| <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">&mut </span>buf)); |
| |
| <span class="kw">let </span>value = <span class="kw">match </span>buf.parse() { |
| <span class="prelude-val">Ok</span>(int) => visitor.visit_u128(int), |
| <span class="prelude-val">Err</span>(<span class="kw">_</span>) => { |
| <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) => <span class="prelude-val">Ok</span>(value), |
| <span class="prelude-val">Err</span>(err) => <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)), |
| } |
| } |
| |
| <span class="kw">fn </span>deserialize_char<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="self">self</span>.deserialize_str(visitor) |
| } |
| |
| <span class="kw">fn </span>deserialize_str<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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'"' </span>=> { |
| <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">&mut </span><span class="self">self</span>.scratch)) { |
| Reference::Borrowed(s) => visitor.visit_borrowed_str(s), |
| Reference::Copied(s) => visitor.visit_str(s), |
| } |
| } |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&</span>visitor)), |
| }; |
| |
| <span class="kw">match </span>value { |
| <span class="prelude-val">Ok</span>(value) => <span class="prelude-val">Ok</span>(value), |
| <span class="prelude-val">Err</span>(err) => <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)), |
| } |
| } |
| |
| <span class="kw">fn </span>deserialize_string<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <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]: |
| /// |
| /// > When all the strings represented in a JSON text are composed entirely |
| /// > of Unicode characters (however escaped), then that JSON text is |
| /// > interoperable in the sense that all software implementations that |
| /// > parse it will agree on the contents of names and of string values in |
| /// > objects and arrays. |
| /// > |
| /// > However, the ABNF in this specification allows member names and string |
| /// > values to contain bit sequences that cannot encode Unicode characters; |
| /// > for example, "\uDEAD" (a single unpaired UTF-16 surrogate). Instances |
| /// > of this have been observed, for example, when a library truncates a |
| /// > UTF-16 string without checking whether the truncation split a |
| /// > surrogate pair. The behavior of software that receives JSON texts |
| /// > containing such values is unpredictable; for example, implementations |
| /// > might return different values for the length of a string value or even |
| /// > 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() -> Result<(), serde_json::Error> { |
| /// let json_data = b"\"some bytes: \xe5\x00\xe5\""; |
| /// let bytes: ByteBuf = serde_json::from_slice(json_data)?; |
| /// |
| /// assert_eq!(b'\xe5', bytes[12]); |
| /// assert_eq!(b'\0', bytes[13]); |
| /// assert_eq!(b'\xe5', 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() -> Result<(), serde_json::Error> { |
| /// let json_data = b"\"lone surrogate: \\uD801\""; |
| /// let bytes: ByteBuf = serde_json::from_slice(json_data)?; |
| /// let expected = b"lone surrogate: \xED\xA0\x81"; |
| /// assert_eq!(expected, bytes.as_slice()); |
| /// Ok(()) |
| /// } |
| /// # |
| /// # look_at_bytes(); |
| /// ``` |
| </span><span class="kw">fn </span>deserialize_bytes<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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'"' </span>=> { |
| <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">&mut </span><span class="self">self</span>.scratch)) { |
| Reference::Borrowed(b) => visitor.visit_borrowed_bytes(b), |
| Reference::Copied(b) => visitor.visit_bytes(b), |
| } |
| } |
| <span class="string">b'[' </span>=> <span class="self">self</span>.deserialize_seq(visitor), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&</span>visitor)), |
| }; |
| |
| <span class="kw">match </span>value { |
| <span class="prelude-val">Ok</span>(value) => <span class="prelude-val">Ok</span>(value), |
| <span class="prelude-val">Err</span>(err) => <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<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <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<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</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'n'</span>) => { |
| <span class="self">self</span>.eat_char(); |
| <span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b"ull"</span>)); |
| visitor.visit_none() |
| } |
| <span class="kw">_ </span>=> visitor.visit_some(<span class="self">self</span>), |
| } |
| } |
| |
| <span class="kw">fn </span>deserialize_unit<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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'n' </span>=> { |
| <span class="self">self</span>.eat_char(); |
| <span class="macro">tri!</span>(<span class="self">self</span>.parse_ident(<span class="string">b"ull"</span>)); |
| visitor.visit_unit() |
| } |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&</span>visitor)), |
| }; |
| |
| <span class="kw">match </span>value { |
| <span class="prelude-val">Ok</span>(value) => <span class="prelude-val">Ok</span>(value), |
| <span class="prelude-val">Err</span>(err) => <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)), |
| } |
| } |
| |
| <span class="kw">fn </span>deserialize_unit_struct<V>(<span class="self">self</span>, _name: <span class="kw-2">&</span><span class="lifetime">'static </span>str, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <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<V>(<span class="self">self</span>, name: <span class="kw-2">&</span>str, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="attribute">#[cfg(feature = <span class="string">"raw_value"</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<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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'[' </span>=> { |
| <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>(())) => <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)) => <span class="prelude-val">Err</span>(err), |
| } |
| } |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&</span>visitor)), |
| }; |
| |
| <span class="kw">match </span>value { |
| <span class="prelude-val">Ok</span>(value) => <span class="prelude-val">Ok</span>(value), |
| <span class="prelude-val">Err</span>(err) => <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)), |
| } |
| } |
| |
| <span class="kw">fn </span>deserialize_tuple<V>(<span class="self">self</span>, _len: usize, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="self">self</span>.deserialize_seq(visitor) |
| } |
| |
| <span class="kw">fn </span>deserialize_tuple_struct<V>( |
| <span class="self">self</span>, |
| _name: <span class="kw-2">&</span><span class="lifetime">'static </span>str, |
| _len: usize, |
| visitor: V, |
| ) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="self">self</span>.deserialize_seq(visitor) |
| } |
| |
| <span class="kw">fn </span>deserialize_map<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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'{' </span>=> { |
| <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>(())) => <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)) => <span class="prelude-val">Err</span>(err), |
| } |
| } |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&</span>visitor)), |
| }; |
| |
| <span class="kw">match </span>value { |
| <span class="prelude-val">Ok</span>(value) => <span class="prelude-val">Ok</span>(value), |
| <span class="prelude-val">Err</span>(err) => <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)), |
| } |
| } |
| |
| <span class="kw">fn </span>deserialize_struct<V>( |
| <span class="self">self</span>, |
| _name: <span class="kw-2">&</span><span class="lifetime">'static </span>str, |
| _fields: <span class="kw-2">&</span><span class="lifetime">'static </span>[<span class="kw-2">&</span><span class="lifetime">'static </span>str], |
| visitor: V, |
| ) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</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) => b, |
| <span class="prelude-val">None </span>=> { |
| <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'[' </span>=> { |
| <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>(())) => <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)) => <span class="prelude-val">Err</span>(err), |
| } |
| } |
| <span class="string">b'{' </span>=> { |
| <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>(())) => <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)) => <span class="prelude-val">Err</span>(err), |
| } |
| } |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_invalid_type(<span class="kw-2">&</span>visitor)), |
| }; |
| |
| <span class="kw">match </span>value { |
| <span class="prelude-val">Ok</span>(value) => <span class="prelude-val">Ok</span>(value), |
| <span class="prelude-val">Err</span>(err) => <span class="prelude-val">Err</span>(<span class="self">self</span>.fix_position(err)), |
| } |
| } |
| |
| <span class="doccomment">/// Parses an enum as an object like `{"$KEY":$VALUE}`, where $VALUE is either a straight |
| /// value, a `[..]`, or a `{..}`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deserialize_enum<V>( |
| <span class="self">self</span>, |
| _name: <span class="kw-2">&</span>str, |
| _variants: <span class="kw-2">&</span><span class="lifetime">'static </span>[<span class="kw-2">&</span><span class="lifetime">'static </span>str], |
| visitor: V, |
| ) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</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'{'</span>) => { |
| <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'}'</span>) => { |
| <span class="self">self</span>.eat_char(); |
| <span class="prelude-val">Ok</span>(value) |
| } |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => <span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::ExpectedSomeValue)), |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.error(ErrorCode::EofWhileParsingObject)), |
| } |
| } |
| <span class="prelude-val">Some</span>(<span class="string">b'"'</span>) => visitor.visit_enum(UnitVariantAccess::new(<span class="self">self</span>)), |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::ExpectedSomeValue)), |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.peek_error(ErrorCode::EofWhileParsingValue)), |
| } |
| } |
| |
| <span class="kw">fn </span>deserialize_identifier<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="self">self</span>.deserialize_str(visitor) |
| } |
| |
| <span class="kw">fn </span>deserialize_ignored_any<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="macro">tri!</span>(<span class="self">self</span>.ignore_value()); |
| visitor.visit_unit() |
| } |
| } |
| |
| <span class="kw">struct </span>SeqAccess<<span class="lifetime">'a</span>, R: <span class="lifetime">'a</span>> { |
| de: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Deserializer<R>, |
| first: bool, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, R: <span class="lifetime">'a</span>> SeqAccess<<span class="lifetime">'a</span>, R> { |
| <span class="kw">fn </span>new(de: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Deserializer<R>) -> <span class="self">Self </span>{ |
| SeqAccess { de, first: <span class="bool-val">true </span>} |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'de</span>, <span class="lifetime">'a</span>, R: Read<<span class="lifetime">'de</span>> + <span class="lifetime">'a</span>> de::SeqAccess<<span class="lifetime">'de</span>> <span class="kw">for </span>SeqAccess<<span class="lifetime">'a</span>, R> { |
| <span class="kw">type </span>Error = Error; |
| |
| <span class="kw">fn </span>next_element_seed<T>(<span class="kw-2">&mut </span><span class="self">self</span>, seed: T) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><T::Value>> |
| <span class="kw">where |
| </span>T: de::DeserializeSeed<<span class="lifetime">'de</span>>, |
| { |
| <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']'</span>) => { |
| <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','</span>) <span class="kw">if </span>!<span class="self">self</span>.first => { |
| <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) => { |
| <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>=> { |
| <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']'</span>) => <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>) => <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="macro">tri!</span>(seed.deserialize(<span class="kw-2">&mut *</span><span class="self">self</span>.de)))), |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.de.peek_error(ErrorCode::EofWhileParsingValue)), |
| } |
| } |
| } |
| |
| <span class="kw">struct </span>MapAccess<<span class="lifetime">'a</span>, R: <span class="lifetime">'a</span>> { |
| de: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Deserializer<R>, |
| first: bool, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, R: <span class="lifetime">'a</span>> MapAccess<<span class="lifetime">'a</span>, R> { |
| <span class="kw">fn </span>new(de: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Deserializer<R>) -> <span class="self">Self </span>{ |
| MapAccess { de, first: <span class="bool-val">true </span>} |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'de</span>, <span class="lifetime">'a</span>, R: Read<<span class="lifetime">'de</span>> + <span class="lifetime">'a</span>> de::MapAccess<<span class="lifetime">'de</span>> <span class="kw">for </span>MapAccess<<span class="lifetime">'a</span>, R> { |
| <span class="kw">type </span>Error = Error; |
| |
| <span class="kw">fn </span>next_key_seed<K>(<span class="kw-2">&mut </span><span class="self">self</span>, seed: K) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><K::Value>> |
| <span class="kw">where |
| </span>K: de::DeserializeSeed<<span class="lifetime">'de</span>>, |
| { |
| <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'}'</span>) => { |
| <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','</span>) <span class="kw">if </span>!<span class="self">self</span>.first => { |
| <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) => { |
| <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>=> { |
| <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'"'</span>) => seed.deserialize(MapKey { de: <span class="kw-2">&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'}'</span>) => <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>) => <span class="prelude-val">Err</span>(<span class="self">self</span>.de.peek_error(ErrorCode::KeyMustBeAString)), |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(<span class="self">self</span>.de.peek_error(ErrorCode::EofWhileParsingValue)), |
| } |
| } |
| |
| <span class="kw">fn </span>next_value_seed<V>(<span class="kw-2">&mut </span><span class="self">self</span>, seed: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::DeserializeSeed<<span class="lifetime">'de</span>>, |
| { |
| <span class="macro">tri!</span>(<span class="self">self</span>.de.parse_object_colon()); |
| |
| seed.deserialize(<span class="kw-2">&mut *</span><span class="self">self</span>.de) |
| } |
| } |
| |
| <span class="kw">struct </span>VariantAccess<<span class="lifetime">'a</span>, R: <span class="lifetime">'a</span>> { |
| de: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Deserializer<R>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, R: <span class="lifetime">'a</span>> VariantAccess<<span class="lifetime">'a</span>, R> { |
| <span class="kw">fn </span>new(de: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Deserializer<R>) -> <span class="self">Self </span>{ |
| VariantAccess { de } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'de</span>, <span class="lifetime">'a</span>, R: Read<<span class="lifetime">'de</span>> + <span class="lifetime">'a</span>> de::EnumAccess<<span class="lifetime">'de</span>> <span class="kw">for </span>VariantAccess<<span class="lifetime">'a</span>, R> { |
| <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<V>(<span class="self">self</span>, seed: V) -> <span class="prelude-ty">Result</span><(V::Value, <span class="self">Self</span>)> |
| <span class="kw">where |
| </span>V: de::DeserializeSeed<<span class="lifetime">'de</span>>, |
| { |
| <span class="kw">let </span>val = <span class="macro">tri!</span>(seed.deserialize(<span class="kw-2">&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><<span class="lifetime">'de</span>, <span class="lifetime">'a</span>, R: Read<<span class="lifetime">'de</span>> + <span class="lifetime">'a</span>> de::VariantAccess<<span class="lifetime">'de</span>> <span class="kw">for </span>VariantAccess<<span class="lifetime">'a</span>, R> { |
| <span class="kw">type </span>Error = Error; |
| |
| <span class="kw">fn </span>unit_variant(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| de::Deserialize::deserialize(<span class="self">self</span>.de) |
| } |
| |
| <span class="kw">fn </span>newtype_variant_seed<T>(<span class="self">self</span>, seed: T) -> <span class="prelude-ty">Result</span><T::Value> |
| <span class="kw">where |
| </span>T: de::DeserializeSeed<<span class="lifetime">'de</span>>, |
| { |
| seed.deserialize(<span class="self">self</span>.de) |
| } |
| |
| <span class="kw">fn </span>tuple_variant<V>(<span class="self">self</span>, _len: usize, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| de::Deserializer::deserialize_seq(<span class="self">self</span>.de, visitor) |
| } |
| |
| <span class="kw">fn </span>struct_variant<V>(<span class="self">self</span>, fields: <span class="kw-2">&</span><span class="lifetime">'static </span>[<span class="kw-2">&</span><span class="lifetime">'static </span>str], visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| de::Deserializer::deserialize_struct(<span class="self">self</span>.de, <span class="string">""</span>, fields, visitor) |
| } |
| } |
| |
| <span class="kw">struct </span>UnitVariantAccess<<span class="lifetime">'a</span>, R: <span class="lifetime">'a</span>> { |
| de: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Deserializer<R>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, R: <span class="lifetime">'a</span>> UnitVariantAccess<<span class="lifetime">'a</span>, R> { |
| <span class="kw">fn </span>new(de: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Deserializer<R>) -> <span class="self">Self </span>{ |
| UnitVariantAccess { de } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'de</span>, <span class="lifetime">'a</span>, R: Read<<span class="lifetime">'de</span>> + <span class="lifetime">'a</span>> de::EnumAccess<<span class="lifetime">'de</span>> <span class="kw">for </span>UnitVariantAccess<<span class="lifetime">'a</span>, R> { |
| <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<V>(<span class="self">self</span>, seed: V) -> <span class="prelude-ty">Result</span><(V::Value, <span class="self">Self</span>)> |
| <span class="kw">where |
| </span>V: de::DeserializeSeed<<span class="lifetime">'de</span>>, |
| { |
| <span class="kw">let </span>variant = <span class="macro">tri!</span>(seed.deserialize(<span class="kw-2">&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><<span class="lifetime">'de</span>, <span class="lifetime">'a</span>, R: Read<<span class="lifetime">'de</span>> + <span class="lifetime">'a</span>> de::VariantAccess<<span class="lifetime">'de</span>> <span class="kw">for </span>UnitVariantAccess<<span class="lifetime">'a</span>, R> { |
| <span class="kw">type </span>Error = Error; |
| |
| <span class="kw">fn </span>unit_variant(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>newtype_variant_seed<T>(<span class="self">self</span>, _seed: T) -> <span class="prelude-ty">Result</span><T::Value> |
| <span class="kw">where |
| </span>T: de::DeserializeSeed<<span class="lifetime">'de</span>>, |
| { |
| <span class="prelude-val">Err</span>(de::Error::invalid_type( |
| Unexpected::UnitVariant, |
| <span class="kw-2">&</span><span class="string">"newtype variant"</span>, |
| )) |
| } |
| |
| <span class="kw">fn </span>tuple_variant<V>(<span class="self">self</span>, _len: usize, _visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="prelude-val">Err</span>(de::Error::invalid_type( |
| Unexpected::UnitVariant, |
| <span class="kw-2">&</span><span class="string">"tuple variant"</span>, |
| )) |
| } |
| |
| <span class="kw">fn </span>struct_variant<V>(<span class="self">self</span>, _fields: <span class="kw-2">&</span><span class="lifetime">'static </span>[<span class="kw-2">&</span><span class="lifetime">'static </span>str], _visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="prelude-val">Err</span>(de::Error::invalid_type( |
| Unexpected::UnitVariant, |
| <span class="kw-2">&</span><span class="string">"struct variant"</span>, |
| )) |
| } |
| } |
| |
| <span class="doccomment">/// Only deserialize from this after peeking a '"' byte! Otherwise it may |
| /// deserialize invalid JSON successfully. |
| </span><span class="kw">struct </span>MapKey<<span class="lifetime">'a</span>, R: <span class="lifetime">'a</span>> { |
| de: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Deserializer<R>, |
| } |
| |
| <span class="macro">macro_rules! </span>deserialize_integer_key { |
| (<span class="macro-nonterminal">$method</span>:ident => <span class="macro-nonterminal">$visit</span>:ident) => { |
| <span class="kw">fn </span><span class="macro-nonterminal">$method</span><V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <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">&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>) => visitor.<span class="macro-nonterminal">$visit</span>(integer), |
| (<span class="prelude-val">Err</span>(<span class="kw">_</span>), Reference::Borrowed(s)) => visitor.visit_borrowed_str(s), |
| (<span class="prelude-val">Err</span>(<span class="kw">_</span>), Reference::Copied(s)) => visitor.visit_str(s), |
| } |
| } |
| }; |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'de</span>, <span class="lifetime">'a</span>, R> de::Deserializer<<span class="lifetime">'de</span>> <span class="kw">for </span>MapKey<<span class="lifetime">'a</span>, R> |
| <span class="kw">where |
| </span>R: Read<<span class="lifetime">'de</span>>, |
| { |
| <span class="kw">type </span>Error = Error; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deserialize_any<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <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">&mut </span><span class="self">self</span>.de.scratch)) { |
| Reference::Borrowed(s) => visitor.visit_borrowed_str(s), |
| Reference::Copied(s) => visitor.visit_str(s), |
| } |
| } |
| |
| <span class="macro">deserialize_integer_key!</span>(deserialize_i8 => visit_i8); |
| <span class="macro">deserialize_integer_key!</span>(deserialize_i16 => visit_i16); |
| <span class="macro">deserialize_integer_key!</span>(deserialize_i32 => visit_i32); |
| <span class="macro">deserialize_integer_key!</span>(deserialize_i64 => visit_i64); |
| <span class="macro">deserialize_integer_key!</span>(deserialize_i128 => visit_i128); |
| <span class="macro">deserialize_integer_key!</span>(deserialize_u8 => visit_u8); |
| <span class="macro">deserialize_integer_key!</span>(deserialize_u16 => visit_u16); |
| <span class="macro">deserialize_integer_key!</span>(deserialize_u32 => visit_u32); |
| <span class="macro">deserialize_integer_key!</span>(deserialize_u64 => visit_u64); |
| <span class="macro">deserialize_integer_key!</span>(deserialize_u128 => visit_u128); |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deserialize_option<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <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<V>(<span class="self">self</span>, name: <span class="kw-2">&</span><span class="lifetime">'static </span>str, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="attribute">#[cfg(feature = <span class="string">"raw_value"</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<V>( |
| <span class="self">self</span>, |
| name: <span class="kw-2">&</span><span class="lifetime">'static </span>str, |
| variants: <span class="kw-2">&</span><span class="lifetime">'static </span>[<span class="kw-2">&</span><span class="lifetime">'static </span>str], |
| visitor: V, |
| ) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="self">self</span>.de.deserialize_enum(name, variants, visitor) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deserialize_bytes<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="self">self</span>.de.deserialize_bytes(visitor) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deserialize_byte_buf<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value> |
| <span class="kw">where |
| </span>V: de::Visitor<<span class="lifetime">'de</span>>, |
| { |
| <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 = "{\"k\": 3}1\"cool\"\"stuff\" 3{} [0, 1, 2]"; |
| /// |
| /// let stream = Deserializer::from_str(data).into_iter::<Value>(); |
| /// |
| /// for value in stream { |
| /// println!("{}", value.unwrap()); |
| /// } |
| /// } |
| /// ``` |
| </span><span class="kw">pub struct </span>StreamDeserializer<<span class="lifetime">'de</span>, R, T> { |
| de: Deserializer<R>, |
| offset: usize, |
| failed: bool, |
| output: PhantomData<T>, |
| lifetime: PhantomData<<span class="kw-2">&</span><span class="lifetime">'de </span>()>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'de</span>, R, T> StreamDeserializer<<span class="lifetime">'de</span>, R, T> |
| <span class="kw">where |
| </span>R: read::Read<<span class="lifetime">'de</span>>, |
| T: de::Deserialize<<span class="lifetime">'de</span>>, |
| { |
| <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) -> <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"[0] [1] ["; |
| /// |
| /// let de = serde_json::Deserializer::from_slice(data); |
| /// let mut stream = de.into_iter::<Vec<i32>>(); |
| /// assert_eq!(0, stream.byte_offset()); |
| /// |
| /// println!("{:?}", stream.next()); // [0] |
| /// assert_eq!(3, stream.byte_offset()); |
| /// |
| /// println!("{:?}", stream.next()); // [1] |
| /// assert_eq!(7, stream.byte_offset()); |
| /// |
| /// println!("{:?}", 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 = &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">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.offset |
| } |
| |
| <span class="kw">fn </span>peek_end_of_value(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| <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' '</span>) | <span class="prelude-val">Some</span>(<span class="string">b'\n'</span>) | <span class="prelude-val">Some</span>(<span class="string">b'\t'</span>) | <span class="prelude-val">Some</span>(<span class="string">b'\r'</span>) | <span class="prelude-val">Some</span>(<span class="string">b'"'</span>) | <span class="prelude-val">Some</span>(<span class="string">b'['</span>) |
| | <span class="prelude-val">Some</span>(<span class="string">b']'</span>) | <span class="prelude-val">Some</span>(<span class="string">b'{'</span>) | <span class="prelude-val">Some</span>(<span class="string">b'}'</span>) | <span class="prelude-val">Some</span>(<span class="string">b','</span>) | <span class="prelude-val">Some</span>(<span class="string">b':'</span>) | <span class="prelude-val">None </span>=> <span class="prelude-val">Ok</span>(()), |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => { |
| <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><<span class="lifetime">'de</span>, R, T> Iterator <span class="kw">for </span>StreamDeserializer<<span class="lifetime">'de</span>, R, T> |
| <span class="kw">where |
| </span>R: Read<<span class="lifetime">'de</span>>, |
| T: de::Deserialize<<span class="lifetime">'de</span>>, |
| { |
| <span class="kw">type </span>Item = <span class="prelude-ty">Result</span><T>; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="prelude-ty">Result</span><T>> { |
| <span class="kw">if </span>R::should_early_return_if_failed && <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>) => { |
| <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)) => { |
| <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'[' </span>| <span class="string">b'"' </span>| <span class="string">b'{' </span>=> <span class="bool-val">true</span>, |
| <span class="kw">_ </span>=> <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">&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) => { |
| <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) => { |
| <span class="self">self</span>.de.read.set_failed(<span class="kw-2">&mut </span><span class="self">self</span>.failed); |
| <span class="prelude-val">Err</span>(e) |
| } |
| }) |
| } |
| <span class="prelude-val">Err</span>(e) => { |
| <span class="self">self</span>.de.read.set_failed(<span class="kw-2">&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><<span class="lifetime">'de</span>, R, T> FusedIterator <span class="kw">for </span>StreamDeserializer<<span class="lifetime">'de</span>, R, T> |
| <span class="kw">where |
| </span>R: Read<<span class="lifetime">'de</span>> + Fused, |
| T: de::Deserialize<<span class="lifetime">'de</span>>, |
| { |
| } |
| |
| <span class="comment">////////////////////////////////////////////////////////////////////////////// |
| |
| </span><span class="kw">fn </span>from_trait<<span class="lifetime">'de</span>, R, T>(read: R) -> <span class="prelude-ty">Result</span><T> |
| <span class="kw">where |
| </span>R: Read<<span class="lifetime">'de</span>>, |
| T: de::Deserialize<<span class="lifetime">'de</span>>, |
| { |
| <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">&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<P: AsRef<Path>>(path: P) -> Result<User, Box<dyn Error>> { |
| /// // 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("test.json").unwrap(); |
| /// println!("{:#?}", 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) -> Result<User, Box<dyn Error>> { |
| /// let mut de = serde_json::Deserializer::from_reader(tcp_stream); |
| /// let u = User::deserialize(&mut de)?; |
| /// |
| /// Ok(u) |
| /// } |
| /// |
| /// fn main() { |
| /// # } |
| /// # fn fake_main() { |
| /// let listener = TcpListener::bind("127.0.0.1:4000").unwrap(); |
| /// |
| /// for stream in listener.incoming() { |
| /// println!("{:#?}", 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`'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">"std"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| </span><span class="kw">pub fn </span>from_reader<R, T>(rdr: R) -> <span class="prelude-ty">Result</span><T> |
| <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 `&[u8]` |
| /// let j = b" |
| /// { |
| /// \"fingerprint\": \"0xF9BA143B95FF6D82\", |
| /// \"location\": \"Menlo Park, CA\" |
| /// }"; |
| /// |
| /// let u: User = serde_json::from_slice(j).unwrap(); |
| /// println!("{:#?}", 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`'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<<span class="lifetime">'a</span>, T>(v: <span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> <span class="prelude-ty">Result</span><T> |
| <span class="kw">where |
| </span>T: de::Deserialize<<span class="lifetime">'a</span>>, |
| { |
| 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 `&str` |
| /// let j = " |
| /// { |
| /// \"fingerprint\": \"0xF9BA143B95FF6D82\", |
| /// \"location\": \"Menlo Park, CA\" |
| /// }"; |
| /// |
| /// let u: User = serde_json::from_str(j).unwrap(); |
| /// println!("{:#?}", 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`'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<<span class="lifetime">'a</span>, T>(s: <span class="kw-2">&</span><span class="lifetime">'a </span>str) -> <span class="prelude-ty">Result</span><T> |
| <span class="kw">where |
| </span>T: de::Deserialize<<span class="lifetime">'a</span>>, |
| { |
| 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> |