<!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 to the Rust file `/home/travis/.cargo/registry/src/github.com-1ecc6299db9ec823/serde_json-1.0.33/src/value/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div></nav><div 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id="1019">1019</span> <span id="1020">1020</span> <span id="1021">1021</span> <span id="1022">1022</span> <span id="1023">1023</span> <span id="1024">1024</span> <span id="1025">1025</span> <span id="1026">1026</span> <span id="1027">1027</span> <span id="1028">1028</span> <span id="1029">1029</span> <span id="1030">1030</span> <span id="1031">1031</span> <span id="1032">1032</span> <span id="1033">1033</span> <span id="1034">1034</span> <span id="1035">1035</span> <span id="1036">1036</span> <span id="1037">1037</span> <span id="1038">1038</span> <span id="1039">1039</span> <span id="1040">1040</span> <span id="1041">1041</span> <span id="1042">1042</span> <span id="1043">1043</span> <span id="1044">1044</span> <span id="1045">1045</span> <span id="1046">1046</span> <span id="1047">1047</span> <span id="1048">1048</span> <span id="1049">1049</span> <span id="1050">1050</span> <span id="1051">1051</span> <span id="1052">1052</span> <span id="1053">1053</span> <span id="1054">1054</span> <span id="1055">1055</span> <span id="1056">1056</span> <span id="1057">1057</span> <span id="1058">1058</span> <span id="1059">1059</span> <span id="1060">1060</span> <span id="1061">1061</span> <span id="1062">1062</span> <span id="1063">1063</span> <span id="1064">1064</span> <span id="1065">1065</span> <span id="1066">1066</span> <span id="1067">1067</span> <span id="1068">1068</span> <span id="1069">1069</span> <span id="1070">1070</span> <span id="1071">1071</span> <span id="1072">1072</span> <span id="1073">1073</span> <span id="1074">1074</span> <span id="1075">1075</span> <span id="1076">1076</span> <span id="1077">1077</span> <span id="1078">1078</span> <span id="1079">1079</span> <span id="1080">1080</span> <span id="1081">1081</span> <span id="1082">1082</span> <span id="1083">1083</span> <span id="1084">1084</span> <span id="1085">1085</span> <span id="1086">1086</span> <span id="1087">1087</span> <span id="1088">1088</span> <span id="1089">1089</span> <span id="1090">1090</span> <span id="1091">1091</span> <span id="1092">1092</span> <span id="1093">1093</span> <span id="1094">1094</span> <span id="1095">1095</span> <span id="1096">1096</span> <span id="1097">1097</span> <span id="1098">1098</span> <span id="1099">1099</span> <span id="1100">1100</span> <span id="1101">1101</span> <span id="1102">1102</span> <span id="1103">1103</span> <span id="1104">1104</span> <span id="1105">1105</span> <span id="1106">1106</span> <span id="1107">1107</span> <span id="1108">1108</span> <span id="1109">1109</span> <span id="1110">1110</span> <span id="1111">1111</span> <span id="1112">1112</span> <span id="1113">1113</span> <span id="1114">1114</span> <span id="1115">1115</span> <span id="1116">1116</span> <span id="1117">1117</span> <span id="1118">1118</span> <span id="1119">1119</span> <span id="1120">1120</span> <span id="1121">1121</span> <span id="1122">1122</span> <span id="1123">1123</span> <span id="1124">1124</span> <span id="1125">1125</span> <span id="1126">1126</span> <span id="1127">1127</span> <span id="1128">1128</span> <span id="1129">1129</span> </pre><pre class="rust "> <span class="comment">// Copyright 2017 Serde Developers</span> <span class="comment">//</span> <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> <span class="comment">// option. This file may not be copied, modified, or distributed</span> <span class="comment">// except according to those terms.</span> <span class="doccomment">//! The Value enum, a loosely typed way of representing any valid JSON value.</span> <span class="doccomment">//!</span> <span class="doccomment">//! # Constructing JSON</span> <span class="doccomment">//!</span> <span class="doccomment">//! Serde JSON provides a [`json!` macro][macro] to build `serde_json::Value`</span> <span class="doccomment">//! objects with very natural JSON syntax. In order to use this macro,</span> <span class="doccomment">//! `serde_json` needs to be imported with the `#[macro_use]` attribute.</span> <span class="doccomment">//!</span> <span class="doccomment">//! ```rust</span> <span class="doccomment">//! #[macro_use]</span> <span class="doccomment">//! extern crate serde_json;</span> <span class="doccomment">//!</span> <span class="doccomment">//! fn main() {</span> <span class="doccomment">//! // The type of `john` is `serde_json::Value`</span> <span class="doccomment">//! let john = json!({</span> <span class="doccomment">//! "name": "John Doe",</span> <span class="doccomment">//! "age": 43,</span> <span class="doccomment">//! "phones": [</span> <span class="doccomment">//! "+44 1234567",</span> <span class="doccomment">//! "+44 2345678"</span> <span class="doccomment">//! ]</span> <span class="doccomment">//! });</span> <span class="doccomment">//!</span> <span class="doccomment">//! println!("first phone number: {}", john["phones"][0]);</span> <span class="doccomment">//!</span> <span class="doccomment">//! // Convert to a string of JSON and print it out</span> <span class="doccomment">//! println!("{}", john.to_string());</span> <span class="doccomment">//! }</span> <span class="doccomment">//! ```</span> <span class="doccomment">//!</span> <span class="doccomment">//! The `Value::to_string()` function converts a `serde_json::Value` into a</span> <span class="doccomment">//! `String` of JSON text.</span> <span class="doccomment">//!</span> <span class="doccomment">//! One neat thing about the `json!` macro is that variables and expressions can</span> <span class="doccomment">//! be interpolated directly into the JSON value as you are building it. Serde</span> <span class="doccomment">//! will check at compile time that the value you are interpolating is able to</span> <span class="doccomment">//! be represented as JSON.</span> <span class="doccomment">//!</span> <span class="doccomment">//! ```rust</span> <span class="doccomment">//! # #[macro_use]</span> <span class="doccomment">//! # extern crate serde_json;</span> <span class="doccomment">//! #</span> <span class="doccomment">//! # fn random_phone() -> u16 { 0 }</span> <span class="doccomment">//! #</span> <span class="doccomment">//! # fn main() {</span> <span class="doccomment">//! let full_name = "John Doe";</span> <span class="doccomment">//! let age_last_year = 42;</span> <span class="doccomment">//!</span> <span class="doccomment">//! // The type of `john` is `serde_json::Value`</span> <span class="doccomment">//! let john = json!({</span> <span class="doccomment">//! "name": full_name,</span> <span class="doccomment">//! "age": age_last_year + 1,</span> <span class="doccomment">//! "phones": [</span> <span class="doccomment">//! format!("+44 {}", random_phone())</span> <span class="doccomment">//! ]</span> <span class="doccomment">//! });</span> <span class="doccomment">//! # let _ = john;</span> <span class="doccomment">//! # }</span> <span class="doccomment">//! ```</span> <span class="doccomment">//!</span> <span class="doccomment">//! A string of JSON data can be parsed into a `serde_json::Value` by the</span> <span class="doccomment">//! [`serde_json::from_str`][from_str] function. There is also</span> <span class="doccomment">//! [`from_slice`][from_slice] for parsing from a byte slice `&[u8]` and</span> <span class="doccomment">//! [`from_reader`][from_reader] for parsing from any `io::Read` like a File or</span> <span class="doccomment">//! a TCP stream.</span> <span class="doccomment">//!</span> <span class="doccomment">//! ```rust</span> <span class="doccomment">//! extern crate serde_json;</span> <span class="doccomment">//!</span> <span class="doccomment">//! use serde_json::{Value, Error};</span> <span class="doccomment">//!</span> <span class="doccomment">//! fn untyped_example() -> Result<(), Error> {</span> <span class="doccomment">//! // Some JSON input data as a &str. Maybe this comes from the user.</span> <span class="doccomment">//! let data = r#"{</span> <span class="doccomment">//! "name": "John Doe",</span> <span class="doccomment">//! "age": 43,</span> <span class="doccomment">//! "phones": [</span> <span class="doccomment">//! "+44 1234567",</span> <span class="doccomment">//! "+44 2345678"</span> <span class="doccomment">//! ]</span> <span class="doccomment">//! }"#;</span> <span class="doccomment">//!</span> <span class="doccomment">//! // Parse the string of data into serde_json::Value.</span> <span class="doccomment">//! let v: Value = serde_json::from_str(data)?;</span> <span class="doccomment">//!</span> <span class="doccomment">//! // Access parts of the data by indexing with square brackets.</span> <span class="doccomment">//! println!("Please call {} at the number {}", v["name"], v["phones"][0]);</span> <span class="doccomment">//!</span> <span class="doccomment">//! Ok(())</span> <span class="doccomment">//! }</span> <span class="doccomment">//! #</span> <span class="doccomment">//! # fn main() {</span> <span class="doccomment">//! # untyped_example().unwrap();</span> <span class="doccomment">//! # }</span> <span class="doccomment">//! ```</span> <span class="doccomment">//!</span> <span class="doccomment">//! [macro]: https://docs.serde.rs/serde_json/macro.json.html</span> <span class="doccomment">//! [from_str]: https://docs.serde.rs/serde_json/de/fn.from_str.html</span> <span class="doccomment">//! [from_slice]: https://docs.serde.rs/serde_json/de/fn.from_slice.html</span> <span class="doccomment">//! [from_reader]: https://docs.serde.rs/serde_json/de/fn.from_reader.html</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>::{<span class="self">self</span>, <span class="ident">Debug</span>}; <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>; <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>; <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>; <span class="kw">use</span> <span class="ident">serde</span>::<span class="ident">de</span>::<span class="ident">DeserializeOwned</span>; <span class="kw">use</span> <span class="ident">serde</span>::<span class="ident">ser</span>::<span class="ident">Serialize</span>; <span class="kw">use</span> <span class="ident">error</span>::<span class="ident">Error</span>; <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">map</span>::<span class="ident">Map</span>; <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">number</span>::<span class="ident">Number</span>; <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"raw_value"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">raw</span>::<span class="ident">RawValue</span>; <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">index</span>::<span class="ident">Index</span>; <span class="kw">use</span> <span class="self">self</span>::<span class="ident">ser</span>::<span class="ident">Serializer</span>; <span class="doccomment">/// Represents any valid JSON value.</span> <span class="doccomment">///</span> <span class="doccomment">/// See the `serde_json::value` module documentation for usage examples.</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">PartialEq</span>)]</span> <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Value</span> { <span class="doccomment">/// Represents a JSON null value.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!(null);</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="ident">Null</span>, <span class="doccomment">/// Represents a JSON boolean.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!(true);</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="ident">Bool</span>(<span class="ident">bool</span>), <span class="doccomment">/// Represents a JSON number, whether integer or floating point.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!(12.5);</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="ident">Number</span>(<span class="ident">Number</span>), <span class="doccomment">/// Represents a JSON string.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!("a string");</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="ident">String</span>(<span class="ident">String</span>), <span class="doccomment">/// Represents a JSON array.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!(["an", "array"]);</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="ident">Array</span>(<span class="ident">Vec</span><span class="op"><</span><span class="ident">Value</span><span class="op">></span>), <span class="doccomment">/// Represents a JSON object.</span> <span class="doccomment">///</span> <span class="doccomment">/// By default the map is backed by a BTreeMap. Enable the `preserve_order`</span> <span class="doccomment">/// feature of serde_json to use IndexMap instead, which preserves</span> <span class="doccomment">/// entries in the order they are inserted into the map. In particular, this</span> <span class="doccomment">/// allows JSON data to be deserialized into a Value and serialized to a</span> <span class="doccomment">/// string while retaining the order of map keys in the input.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "an": "object" });</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="ident">Object</span>(<span class="ident">Map</span><span class="op"><</span><span class="ident">String</span>, <span class="ident">Value</span><span class="op">></span>), } <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Value</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Null</span> <span class="op">=></span> <span class="ident">formatter</span>.<span class="ident">debug_tuple</span>(<span class="string">"Null"</span>).<span class="ident">finish</span>(), <span class="ident">Value</span>::<span class="ident">Bool</span>(<span class="ident">v</span>) <span class="op">=></span> <span class="ident">formatter</span>.<span class="ident">debug_tuple</span>(<span class="string">"Bool"</span>).<span class="ident">field</span>(<span class="kw-2">&</span><span class="ident">v</span>).<span class="ident">finish</span>(), <span class="ident">Value</span>::<span class="ident">Number</span>(<span class="kw-2">ref</span> <span class="ident">v</span>) <span class="op">=></span> <span class="ident">Debug</span>::<span class="ident">fmt</span>(<span class="ident">v</span>, <span class="ident">formatter</span>), <span class="ident">Value</span>::<span class="ident">String</span>(<span class="kw-2">ref</span> <span class="ident">v</span>) <span class="op">=></span> <span class="ident">formatter</span>.<span class="ident">debug_tuple</span>(<span class="string">"String"</span>).<span class="ident">field</span>(<span class="ident">v</span>).<span class="ident">finish</span>(), <span class="ident">Value</span>::<span class="ident">Array</span>(<span class="kw-2">ref</span> <span class="ident">v</span>) <span class="op">=></span> <span class="ident">formatter</span>.<span class="ident">debug_tuple</span>(<span class="string">"Array"</span>).<span class="ident">field</span>(<span class="ident">v</span>).<span class="ident">finish</span>(), <span class="ident">Value</span>::<span class="ident">Object</span>(<span class="kw-2">ref</span> <span class="ident">v</span>) <span class="op">=></span> <span class="ident">formatter</span>.<span class="ident">debug_tuple</span>(<span class="string">"Object"</span>).<span class="ident">field</span>(<span class="ident">v</span>).<span class="ident">finish</span>(), } } } <span class="kw">struct</span> <span class="ident">WriterFormatter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">inner</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>, } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span><span class="op">></span> <span class="ident">io</span>::<span class="ident">Write</span> <span class="kw">for</span> <span class="ident">WriterFormatter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">io_error</span><span class="op"><</span><span class="ident">E</span><span class="op">></span>(<span class="kw">_</span>: <span class="ident">E</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="ident">Error</span> { <span class="comment">// Error value does not matter because fmt::Display impl below just</span> <span class="comment">// maps it to fmt::Error</span> <span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Other</span>, <span class="string">"fmt error"</span>) } <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">str</span>::<span class="ident">from_utf8</span>(<span class="ident">buf</span>).<span class="ident">map_err</span>(<span class="ident">io_error</span>)); <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">write_str</span>(<span class="ident">s</span>).<span class="ident">map_err</span>(<span class="ident">io_error</span>)); <span class="prelude-val">Ok</span>(<span class="ident">buf</span>.<span class="ident">len</span>()) } <span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { <span class="prelude-val">Ok</span>(()) } } <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Value</span> { <span class="doccomment">/// Display a JSON value as a string.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let json = json!({ "city": "London", "street": "10 Downing Street" });</span> <span class="doccomment">///</span> <span class="doccomment">/// // Compact format:</span> <span class="doccomment">/// //</span> <span class="doccomment">/// // {"city":"London","street":"10 Downing Street"}</span> <span class="doccomment">/// let compact = format!("{}", json);</span> <span class="doccomment">/// assert_eq!(compact,</span> <span class="doccomment">/// "{\"city\":\"London\",\"street\":\"10 Downing Street\"}");</span> <span class="doccomment">///</span> <span class="doccomment">/// // Pretty format:</span> <span class="doccomment">/// //</span> <span class="doccomment">/// // {</span> <span class="doccomment">/// // "city": "London",</span> <span class="doccomment">/// // "street": "10 Downing Street"</span> <span class="doccomment">/// // }</span> <span class="doccomment">/// let pretty = format!("{:#}", json);</span> <span class="doccomment">/// assert_eq!(pretty,</span> <span class="doccomment">/// "{\n \"city\": \"London\",\n \"street\": \"10 Downing Street\"\n}");</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="kw">let</span> <span class="ident">alternate</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">alternate</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">wr</span> <span class="op">=</span> <span class="ident">WriterFormatter</span> { <span class="ident">inner</span>: <span class="ident">f</span> }; <span class="kw">if</span> <span class="ident">alternate</span> { <span class="comment">// {:#}</span> <span class="kw">super</span>::<span class="ident">ser</span>::<span class="ident">to_writer_pretty</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">wr</span>, <span class="self">self</span>).<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">fmt</span>::<span class="ident">Error</span>) } <span class="kw">else</span> { <span class="comment">// {}</span> <span class="kw">super</span>::<span class="ident">ser</span>::<span class="ident">to_writer</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">wr</span>, <span class="self">self</span>).<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">fmt</span>::<span class="ident">Error</span>) } } } <span class="kw">fn</span> <span class="ident">parse_index</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">starts_with</span>(<span class="string">'+'</span>) <span class="op">||</span> (<span class="ident">s</span>.<span class="ident">starts_with</span>(<span class="string">'0'</span>) <span class="op">&&</span> <span class="ident">s</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="number">1</span>) { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="ident">s</span>.<span class="ident">parse</span>().<span class="ident">ok</span>() } <span class="kw">impl</span> <span class="ident">Value</span> { <span class="doccomment">/// Index into a JSON array or map. A string index can be used to access a</span> <span class="doccomment">/// value in a map, and a usize index can be used to access an element of an</span> <span class="doccomment">/// array.</span> <span class="doccomment">///</span> <span class="doccomment">/// Returns `None` if the type of `self` does not match the type of the</span> <span class="doccomment">/// index, for example if the index is a string and `self` is an array or a</span> <span class="doccomment">/// number. Also returns `None` if the given key does not exist in the map</span> <span class="doccomment">/// or the given index is not within the bounds of the array.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let object = json!({ "A": 65, "B": 66, "C": 67 });</span> <span class="doccomment">/// assert_eq!(*object.get("A").unwrap(), json!(65));</span> <span class="doccomment">///</span> <span class="doccomment">/// let array = json!([ "A", "B", "C" ]);</span> <span class="doccomment">/// assert_eq!(*array.get(2).unwrap(), json!("C"));</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(array.get("A"), None);</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// Square brackets can also be used to index into a value in a more concise</span> <span class="doccomment">/// way. This returns `Value::Null` in cases where `get` would have returned</span> <span class="doccomment">/// `None`.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let object = json!({</span> <span class="doccomment">/// "A": ["a", "á", "à"],</span> <span class="doccomment">/// "B": ["b", "b́"],</span> <span class="doccomment">/// "C": ["c", "ć", "ć̣", "ḉ"],</span> <span class="doccomment">/// });</span> <span class="doccomment">/// assert_eq!(object["B"][0], json!("b"));</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(object["D"], json!(null));</span> <span class="doccomment">/// assert_eq!(object[0]["x"]["y"]["z"], json!(null));</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">Index</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">Value</span><span class="op">></span> { <span class="ident">index</span>.<span class="ident">index_into</span>(<span class="self">self</span>) } <span class="doccomment">/// Mutably index into a JSON array or map. A string index can be used to</span> <span class="doccomment">/// access a value in a map, and a usize index can be used to access an</span> <span class="doccomment">/// element of an array.</span> <span class="doccomment">///</span> <span class="doccomment">/// Returns `None` if the type of `self` does not match the type of the</span> <span class="doccomment">/// index, for example if the index is a string and `self` is an array or a</span> <span class="doccomment">/// number. Also returns `None` if the given key does not exist in the map</span> <span class="doccomment">/// or the given index is not within the bounds of the array.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let mut object = json!({ "A": 65, "B": 66, "C": 67 });</span> <span class="doccomment">/// *object.get_mut("A").unwrap() = json!(69);</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut array = json!([ "A", "B", "C" ]);</span> <span class="doccomment">/// *array.get_mut(2).unwrap() = json!("D");</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">Index</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Value</span><span class="op">></span> { <span class="ident">index</span>.<span class="ident">index_into_mut</span>(<span class="self">self</span>) } <span class="doccomment">/// Returns true if the `Value` is an Object. Returns false otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// For any Value on which `is_object` returns true, `as_object` and</span> <span class="doccomment">/// `as_object_mut` are guaranteed to return the map representation of the</span> <span class="doccomment">/// object.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let obj = json!({ "a": { "nested": true }, "b": ["an", "array"] });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert!(obj.is_object());</span> <span class="doccomment">/// assert!(obj["a"].is_object());</span> <span class="doccomment">///</span> <span class="doccomment">/// // array, not an object</span> <span class="doccomment">/// assert!(!obj["b"].is_object());</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_object</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">as_object</span>().<span class="ident">is_some</span>() } <span class="doccomment">/// If the `Value` is an Object, returns the associated Map. Returns None</span> <span class="doccomment">/// otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "a": { "nested": true }, "b": ["an", "array"] });</span> <span class="doccomment">///</span> <span class="doccomment">/// // The length of `{"nested": true}` is 1 entry.</span> <span class="doccomment">/// assert_eq!(v["a"].as_object().unwrap().len(), 1);</span> <span class="doccomment">///</span> <span class="doccomment">/// // The array `["an", "array"]` is not an object.</span> <span class="doccomment">/// assert_eq!(v["b"].as_object(), None);</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_object</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">Map</span><span class="op"><</span><span class="ident">String</span>, <span class="ident">Value</span><span class="op">>></span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Object</span>(<span class="kw-2">ref</span> <span class="ident">map</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">map</span>), <span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// If the `Value` is an Object, returns the associated mutable Map.</span> <span class="doccomment">/// Returns None otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let mut v = json!({ "a": { "nested": true } });</span> <span class="doccomment">///</span> <span class="doccomment">/// v["a"].as_object_mut().unwrap().clear();</span> <span class="doccomment">/// assert_eq!(v, json!({ "a": {} }));</span> <span class="doccomment">/// # }</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_object_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Map</span><span class="op"><</span><span class="ident">String</span>, <span class="ident">Value</span><span class="op">>></span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Object</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">map</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">map</span>), <span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// Returns true if the `Value` is an Array. Returns false otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// For any Value on which `is_array` returns true, `as_array` and</span> <span class="doccomment">/// `as_array_mut` are guaranteed to return the vector representing the</span> <span class="doccomment">/// array.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let obj = json!({ "a": ["an", "array"], "b": { "an": "object" } });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert!(obj["a"].is_array());</span> <span class="doccomment">///</span> <span class="doccomment">/// // an object, not an array</span> <span class="doccomment">/// assert!(!obj["b"].is_array());</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_array</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">as_array</span>().<span class="ident">is_some</span>() } <span class="doccomment">/// If the `Value` is an Array, returns the associated vector. Returns None</span> <span class="doccomment">/// otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "a": ["an", "array"], "b": { "an": "object" } });</span> <span class="doccomment">///</span> <span class="doccomment">/// // The length of `["an", "array"]` is 2 elements.</span> <span class="doccomment">/// assert_eq!(v["a"].as_array().unwrap().len(), 2);</span> <span class="doccomment">///</span> <span class="doccomment">/// // The object `{"an": "object"}` is not an array.</span> <span class="doccomment">/// assert_eq!(v["b"].as_array(), None);</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_array</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Value</span><span class="op">>></span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Array</span>(<span class="kw-2">ref</span> <span class="ident">array</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">array</span>), <span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// If the `Value` is an Array, returns the associated mutable vector.</span> <span class="doccomment">/// Returns None otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let mut v = json!({ "a": ["an", "array"] });</span> <span class="doccomment">///</span> <span class="doccomment">/// v["a"].as_array_mut().unwrap().clear();</span> <span class="doccomment">/// assert_eq!(v, json!({ "a": [] }));</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_array_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">Value</span><span class="op">>></span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Array</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">list</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">list</span>), <span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// Returns true if the `Value` is a String. Returns false otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// For any Value on which `is_string` returns true, `as_str` is guaranteed</span> <span class="doccomment">/// to return the string slice.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "a": "some string", "b": false });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert!(v["a"].is_string());</span> <span class="doccomment">///</span> <span class="doccomment">/// // The boolean `false` is not a string.</span> <span class="doccomment">/// assert!(!v["b"].is_string());</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_string</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">as_str</span>().<span class="ident">is_some</span>() } <span class="doccomment">/// If the `Value` is a String, returns the associated str. Returns None</span> <span class="doccomment">/// otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "a": "some string", "b": false });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(v["a"].as_str(), Some("some string"));</span> <span class="doccomment">///</span> <span class="doccomment">/// // The boolean `false` is not a string.</span> <span class="doccomment">/// assert_eq!(v["b"].as_str(), None);</span> <span class="doccomment">///</span> <span class="doccomment">/// // JSON values are printed in JSON representation, so strings are in quotes.</span> <span class="doccomment">/// //</span> <span class="doccomment">/// // The value is: "some string"</span> <span class="doccomment">/// println!("The value is: {}", v["a"]);</span> <span class="doccomment">///</span> <span class="doccomment">/// // Rust strings are printed without quotes.</span> <span class="doccomment">/// //</span> <span class="doccomment">/// // The value is: some string</span> <span class="doccomment">/// println!("The value is: {}", v["a"].as_str().unwrap());</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_str</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">String</span>(<span class="kw-2">ref</span> <span class="ident">s</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">s</span>), <span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// Returns true if the `Value` is a Number. Returns false otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "a": 1, "b": "2" });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert!(v["a"].is_number());</span> <span class="doccomment">///</span> <span class="doccomment">/// // The string `"2"` is a string, not a number.</span> <span class="doccomment">/// assert!(!v["b"].is_number());</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_number</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Number</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="bool-val">true</span>, <span class="kw">_</span> <span class="op">=></span> <span class="bool-val">false</span>, } } <span class="doccomment">/// Returns true if the `Value` is an integer between `i64::MIN` and</span> <span class="doccomment">/// `i64::MAX`.</span> <span class="doccomment">///</span> <span class="doccomment">/// For any Value on which `is_i64` returns true, `as_i64` is guaranteed to</span> <span class="doccomment">/// return the integer value.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let big = i64::max_value() as u64 + 10;</span> <span class="doccomment">/// let v = json!({ "a": 64, "b": big, "c": 256.0 });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert!(v["a"].is_i64());</span> <span class="doccomment">///</span> <span class="doccomment">/// // Greater than i64::MAX.</span> <span class="doccomment">/// assert!(!v["b"].is_i64());</span> <span class="doccomment">///</span> <span class="doccomment">/// // Numbers with a decimal point are not considered integers.</span> <span class="doccomment">/// assert!(!v["c"].is_i64());</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_i64</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Number</span>(<span class="kw-2">ref</span> <span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span>.<span class="ident">is_i64</span>(), <span class="kw">_</span> <span class="op">=></span> <span class="bool-val">false</span>, } } <span class="doccomment">/// Returns true if the `Value` is an integer between zero and `u64::MAX`.</span> <span class="doccomment">///</span> <span class="doccomment">/// For any Value on which `is_u64` returns true, `as_u64` is guaranteed to</span> <span class="doccomment">/// return the integer value.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "a": 64, "b": -64, "c": 256.0 });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert!(v["a"].is_u64());</span> <span class="doccomment">///</span> <span class="doccomment">/// // Negative integer.</span> <span class="doccomment">/// assert!(!v["b"].is_u64());</span> <span class="doccomment">///</span> <span class="doccomment">/// // Numbers with a decimal point are not considered integers.</span> <span class="doccomment">/// assert!(!v["c"].is_u64());</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_u64</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Number</span>(<span class="kw-2">ref</span> <span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span>.<span class="ident">is_u64</span>(), <span class="kw">_</span> <span class="op">=></span> <span class="bool-val">false</span>, } } <span class="doccomment">/// Returns true if the `Value` is a number that can be represented by f64.</span> <span class="doccomment">///</span> <span class="doccomment">/// For any Value on which `is_f64` returns true, `as_f64` is guaranteed to</span> <span class="doccomment">/// return the floating point value.</span> <span class="doccomment">///</span> <span class="doccomment">/// Currently this function returns true if and only if both `is_i64` and</span> <span class="doccomment">/// `is_u64` return false but this is not a guarantee in the future.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "a": 256.0, "b": 64, "c": -64 });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert!(v["a"].is_f64());</span> <span class="doccomment">///</span> <span class="doccomment">/// // Integers.</span> <span class="doccomment">/// assert!(!v["b"].is_f64());</span> <span class="doccomment">/// assert!(!v["c"].is_f64());</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_f64</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Number</span>(<span class="kw-2">ref</span> <span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span>.<span class="ident">is_f64</span>(), <span class="kw">_</span> <span class="op">=></span> <span class="bool-val">false</span>, } } <span class="doccomment">/// If the `Value` is an integer, represent it as i64 if possible. Returns</span> <span class="doccomment">/// None otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let big = i64::max_value() as u64 + 10;</span> <span class="doccomment">/// let v = json!({ "a": 64, "b": big, "c": 256.0 });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(v["a"].as_i64(), Some(64));</span> <span class="doccomment">/// assert_eq!(v["b"].as_i64(), None);</span> <span class="doccomment">/// assert_eq!(v["c"].as_i64(), None);</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_i64</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">i64</span><span class="op">></span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Number</span>(<span class="kw-2">ref</span> <span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span>.<span class="ident">as_i64</span>(), <span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// If the `Value` is an integer, represent it as u64 if possible. Returns</span> <span class="doccomment">/// None otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "a": 64, "b": -64, "c": 256.0 });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(v["a"].as_u64(), Some(64));</span> <span class="doccomment">/// assert_eq!(v["b"].as_u64(), None);</span> <span class="doccomment">/// assert_eq!(v["c"].as_u64(), None);</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_u64</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u64</span><span class="op">></span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Number</span>(<span class="kw-2">ref</span> <span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span>.<span class="ident">as_u64</span>(), <span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// If the `Value` is a number, represent it as f64 if possible. Returns</span> <span class="doccomment">/// None otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "a": 256.0, "b": 64, "c": -64 });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(v["a"].as_f64(), Some(256.0));</span> <span class="doccomment">/// assert_eq!(v["b"].as_f64(), Some(64.0));</span> <span class="doccomment">/// assert_eq!(v["c"].as_f64(), Some(-64.0));</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_f64</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">f64</span><span class="op">></span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Number</span>(<span class="kw-2">ref</span> <span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span>.<span class="ident">as_f64</span>(), <span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// Returns true if the `Value` is a Boolean. Returns false otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// For any Value on which `is_boolean` returns true, `as_bool` is</span> <span class="doccomment">/// guaranteed to return the boolean value.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "a": false, "b": "false" });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert!(v["a"].is_boolean());</span> <span class="doccomment">///</span> <span class="doccomment">/// // The string `"false"` is a string, not a boolean.</span> <span class="doccomment">/// assert!(!v["b"].is_boolean());</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_boolean</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">as_bool</span>().<span class="ident">is_some</span>() } <span class="doccomment">/// If the `Value` is a Boolean, returns the associated bool. Returns None</span> <span class="doccomment">/// otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "a": false, "b": "false" });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(v["a"].as_bool(), Some(false));</span> <span class="doccomment">///</span> <span class="doccomment">/// // The string `"false"` is a string, not a boolean.</span> <span class="doccomment">/// assert_eq!(v["b"].as_bool(), None);</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_bool</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">bool</span><span class="op">></span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Bool</span>(<span class="ident">b</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">b</span>), <span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// Returns true if the `Value` is a Null. Returns false otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// For any Value on which `is_null` returns true, `as_null` is guaranteed</span> <span class="doccomment">/// to return `Some(())`.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "a": null, "b": false });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert!(v["a"].is_null());</span> <span class="doccomment">///</span> <span class="doccomment">/// // The boolean `false` is not null.</span> <span class="doccomment">/// assert!(!v["b"].is_null());</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_null</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">as_null</span>().<span class="ident">is_some</span>() } <span class="doccomment">/// If the `Value` is a Null, returns (). Returns None otherwise.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let v = json!({ "a": null, "b": false });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(v["a"].as_null(), Some(()));</span> <span class="doccomment">///</span> <span class="doccomment">/// // The boolean `false` is not null.</span> <span class="doccomment">/// assert_eq!(v["b"].as_null(), None);</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_null</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span>()<span class="op">></span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Value</span>::<span class="ident">Null</span> <span class="op">=></span> <span class="prelude-val">Some</span>(()), <span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// Looks up a value by a JSON Pointer.</span> <span class="doccomment">///</span> <span class="doccomment">/// JSON Pointer defines a string syntax for identifying a specific value</span> <span class="doccomment">/// within a JavaScript Object Notation (JSON) document.</span> <span class="doccomment">///</span> <span class="doccomment">/// A Pointer is a Unicode string with the reference tokens separated by `/`.</span> <span class="doccomment">/// Inside tokens `/` is replaced by `~1` and `~` is replaced by `~0`. The</span> <span class="doccomment">/// addressed value is returned and if there is no such value `None` is</span> <span class="doccomment">/// returned.</span> <span class="doccomment">///</span> <span class="doccomment">/// For more information read [RFC6901](https://tools.ietf.org/html/rfc6901).</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let data = json!({</span> <span class="doccomment">/// "x": {</span> <span class="doccomment">/// "y": ["z", "zz"]</span> <span class="doccomment">/// }</span> <span class="doccomment">/// });</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(data.pointer("/x/y/1").unwrap(), &json!("zz"));</span> <span class="doccomment">/// assert_eq!(data.pointer("/a/b/c"), None);</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pointer</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>, <span class="ident">pointer</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Value</span><span class="op">></span> { <span class="kw">if</span> <span class="ident">pointer</span> <span class="op">==</span> <span class="string">""</span> { <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="self">self</span>); } <span class="kw">if</span> <span class="op">!</span><span class="ident">pointer</span>.<span class="ident">starts_with</span>(<span class="string">'/'</span>) { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="kw">let</span> <span class="ident">tokens</span> <span class="op">=</span> <span class="ident">pointer</span> .<span class="ident">split</span>(<span class="string">'/'</span>) .<span class="ident">skip</span>(<span class="number">1</span>) .<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">replace</span>(<span class="string">"~1"</span>, <span class="string">"/"</span>).<span class="ident">replace</span>(<span class="string">"~0"</span>, <span class="string">"~"</span>)); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">target</span> <span class="op">=</span> <span class="self">self</span>; <span class="kw">for</span> <span class="ident">token</span> <span class="kw">in</span> <span class="ident">tokens</span> { <span class="kw">let</span> <span class="ident">target_opt</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">target</span> { <span class="ident">Value</span>::<span class="ident">Object</span>(<span class="kw-2">ref</span> <span class="ident">map</span>) <span class="op">=></span> <span class="ident">map</span>.<span class="ident">get</span>(<span class="kw-2">&</span><span class="ident">token</span>), <span class="ident">Value</span>::<span class="ident">Array</span>(<span class="kw-2">ref</span> <span class="ident">list</span>) <span class="op">=></span> <span class="ident">parse_index</span>(<span class="kw-2">&</span><span class="ident">token</span>).<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">list</span>.<span class="ident">get</span>(<span class="ident">x</span>)), <span class="kw">_</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">None</span>, }; <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">t</span>) <span class="op">=</span> <span class="ident">target_opt</span> { <span class="ident">target</span> <span class="op">=</span> <span class="ident">t</span>; } <span class="kw">else</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } } <span class="prelude-val">Some</span>(<span class="ident">target</span>) } <span class="doccomment">/// Looks up a value by a JSON Pointer and returns a mutable reference to</span> <span class="doccomment">/// that value.</span> <span class="doccomment">///</span> <span class="doccomment">/// JSON Pointer defines a string syntax for identifying a specific value</span> <span class="doccomment">/// within a JavaScript Object Notation (JSON) document.</span> <span class="doccomment">///</span> <span class="doccomment">/// A Pointer is a Unicode string with the reference tokens separated by `/`.</span> <span class="doccomment">/// Inside tokens `/` is replaced by `~1` and `~` is replaced by `~0`. The</span> <span class="doccomment">/// addressed value is returned and if there is no such value `None` is</span> <span class="doccomment">/// returned.</span> <span class="doccomment">///</span> <span class="doccomment">/// For more information read [RFC6901](https://tools.ietf.org/html/rfc6901).</span> <span class="doccomment">///</span> <span class="doccomment">/// # Example of Use</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// extern crate serde_json;</span> <span class="doccomment">///</span> <span class="doccomment">/// use serde_json::Value;</span> <span class="doccomment">///</span> <span class="doccomment">/// fn main() {</span> <span class="doccomment">/// let s = r#"{"x": 1.0, "y": 2.0}"#;</span> <span class="doccomment">/// let mut value: Value = serde_json::from_str(s).unwrap();</span> <span class="doccomment">///</span> <span class="doccomment">/// // Check value using read-only pointer</span> <span class="doccomment">/// assert_eq!(value.pointer("/x"), Some(&1.0.into()));</span> <span class="doccomment">/// // Change value with direct assignment</span> <span class="doccomment">/// *value.pointer_mut("/x").unwrap() = 1.5.into();</span> <span class="doccomment">/// // Check that new value was written</span> <span class="doccomment">/// assert_eq!(value.pointer("/x"), Some(&1.5.into()));</span> <span class="doccomment">///</span> <span class="doccomment">/// // "Steal" ownership of a value. Can replace with any valid Value.</span> <span class="doccomment">/// let old_x = value.pointer_mut("/x").map(Value::take).unwrap();</span> <span class="doccomment">/// assert_eq!(old_x, 1.5);</span> <span class="doccomment">/// assert_eq!(value.pointer("/x").unwrap(), &Value::Null);</span> <span class="doccomment">/// }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pointer_mut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">pointer</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">Value</span><span class="op">></span> { <span class="kw">if</span> <span class="ident">pointer</span> <span class="op">==</span> <span class="string">""</span> { <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="self">self</span>); } <span class="kw">if</span> <span class="op">!</span><span class="ident">pointer</span>.<span class="ident">starts_with</span>(<span class="string">'/'</span>) { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="kw">let</span> <span class="ident">tokens</span> <span class="op">=</span> <span class="ident">pointer</span> .<span class="ident">split</span>(<span class="string">'/'</span>) .<span class="ident">skip</span>(<span class="number">1</span>) .<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">replace</span>(<span class="string">"~1"</span>, <span class="string">"/"</span>).<span class="ident">replace</span>(<span class="string">"~0"</span>, <span class="string">"~"</span>)); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">target</span> <span class="op">=</span> <span class="self">self</span>; <span class="kw">for</span> <span class="ident">token</span> <span class="kw">in</span> <span class="ident">tokens</span> { <span class="comment">// borrow checker gets confused about `target` being mutably borrowed too many times because of the loop</span> <span class="comment">// this once-per-loop binding makes the scope clearer and circumvents the error</span> <span class="kw">let</span> <span class="ident">target_once</span> <span class="op">=</span> <span class="ident">target</span>; <span class="kw">let</span> <span class="ident">target_opt</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">target_once</span> { <span class="ident">Value</span>::<span class="ident">Object</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">map</span>) <span class="op">=></span> <span class="ident">map</span>.<span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="ident">token</span>), <span class="ident">Value</span>::<span class="ident">Array</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">list</span>) <span class="op">=></span> { <span class="ident">parse_index</span>(<span class="kw-2">&</span><span class="ident">token</span>).<span class="ident">and_then</span>(<span class="kw">move</span> <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">list</span>.<span class="ident">get_mut</span>(<span class="ident">x</span>)) } <span class="kw">_</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">None</span>, }; <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">t</span>) <span class="op">=</span> <span class="ident">target_opt</span> { <span class="ident">target</span> <span class="op">=</span> <span class="ident">t</span>; } <span class="kw">else</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } } <span class="prelude-val">Some</span>(<span class="ident">target</span>) } <span class="doccomment">/// Takes the value out of the `Value`, leaving a `Null` in its place.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// let mut v = json!({ "x": "y" });</span> <span class="doccomment">/// assert_eq!(v["x"].take(), json!("y"));</span> <span class="doccomment">/// assert_eq!(v, json!({ "x": null }));</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">take</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Value</span> { <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="self">self</span>, <span class="ident">Value</span>::<span class="ident">Null</span>) } } <span class="doccomment">/// The default value is `Value::Null`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This is useful for handling omitted `Value` fields when deserializing.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # #[macro_use]</span> <span class="doccomment">/// # extern crate serde_derive;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # extern crate serde_json;</span> <span class="doccomment">/// #</span> <span class="doccomment">/// use serde_json::Value;</span> <span class="doccomment">///</span> <span class="doccomment">/// #[derive(Deserialize)]</span> <span class="doccomment">/// struct Settings {</span> <span class="doccomment">/// level: i32,</span> <span class="doccomment">/// #[serde(default)]</span> <span class="doccomment">/// extras: Value,</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// # fn try_main() -> Result<(), serde_json::Error> {</span> <span class="doccomment">/// let data = r#" { "level": 42 } "#;</span> <span class="doccomment">/// let s: Settings = serde_json::from_str(data)?;</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(s.level, 42);</span> <span class="doccomment">/// assert_eq!(s.extras, Value::Null);</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # Ok(())</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// # try_main().unwrap()</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Value</span> { <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">Value</span> { <span class="ident">Value</span>::<span class="ident">Null</span> } } <span class="kw">mod</span> <span class="ident">de</span>; <span class="kw">mod</span> <span class="ident">from</span>; <span class="kw">mod</span> <span class="ident">index</span>; <span class="kw">mod</span> <span class="ident">partial_eq</span>; <span class="kw">mod</span> <span class="ident">ser</span>; <span class="doccomment">/// Convert a `T` into `serde_json::Value` which is an enum that can represent</span> <span class="doccomment">/// any valid JSON data.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// extern crate serde;</span> <span class="doccomment">///</span> <span class="doccomment">/// #[macro_use]</span> <span class="doccomment">/// extern crate serde_derive;</span> <span class="doccomment">///</span> <span class="doccomment">/// #[macro_use]</span> <span class="doccomment">/// extern crate serde_json;</span> <span class="doccomment">///</span> <span class="doccomment">/// use std::error::Error;</span> <span class="doccomment">///</span> <span class="doccomment">/// #[derive(Serialize)]</span> <span class="doccomment">/// struct User {</span> <span class="doccomment">/// fingerprint: String,</span> <span class="doccomment">/// location: String,</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// fn compare_json_values() -> Result<(), Box<Error>> {</span> <span class="doccomment">/// let u = User {</span> <span class="doccomment">/// fingerprint: "0xF9BA143B95FF6D82".to_owned(),</span> <span class="doccomment">/// location: "Menlo Park, CA".to_owned(),</span> <span class="doccomment">/// };</span> <span class="doccomment">///</span> <span class="doccomment">/// // The type of `expected` is `serde_json::Value`</span> <span class="doccomment">/// let expected = json!({</span> <span class="doccomment">/// "fingerprint": "0xF9BA143B95FF6D82",</span> <span class="doccomment">/// "location": "Menlo Park, CA",</span> <span class="doccomment">/// });</span> <span class="doccomment">///</span> <span class="doccomment">/// let v = serde_json::to_value(u).unwrap();</span> <span class="doccomment">/// assert_eq!(v, expected);</span> <span class="doccomment">///</span> <span class="doccomment">/// Ok(())</span> <span class="doccomment">/// }</span> <span class="doccomment">/// #</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// # compare_json_values().unwrap();</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// # Errors</span> <span class="doccomment">///</span> <span class="doccomment">/// This conversion can fail if `T`'s implementation of `Serialize` decides to</span> <span class="doccomment">/// fail, or if `T` contains a map with non-string keys.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// extern crate serde_json;</span> <span class="doccomment">///</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// fn main() {</span> <span class="doccomment">/// // The keys in this map are vectors, not strings.</span> <span class="doccomment">/// let mut map = BTreeMap::new();</span> <span class="doccomment">/// map.insert(vec![32, 64], "x86");</span> <span class="doccomment">///</span> <span class="doccomment">/// println!("{}", serde_json::to_value(map).unwrap_err());</span> <span class="doccomment">/// }</span> <span class="doccomment">/// ```</span> <span class="comment">// Taking by value is more friendly to iterator adapters, option and result</span> <span class="comment">// consumers, etc. See https://github.com/serde-rs/json/pull/149.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_value</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">value</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Value</span>, <span class="ident">Error</span><span class="op">></span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Serialize</span>, { <span class="ident">value</span>.<span class="ident">serialize</span>(<span class="ident">Serializer</span>) } <span class="doccomment">/// Interpret a `serde_json::Value` as an instance of type `T`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This conversion can fail if the structure of the Value does not match the</span> <span class="doccomment">/// structure expected by `T`, for example if `T` is a struct type but the Value</span> <span class="doccomment">/// contains something other than a JSON map. It can also fail if the structure</span> <span class="doccomment">/// is correct but `T`'s implementation of `Deserialize` decides that something</span> <span class="doccomment">/// is wrong with the data, for example required struct fields are missing from</span> <span class="doccomment">/// the JSON map or some number is too big to fit in the expected primitive</span> <span class="doccomment">/// type.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// #[macro_use]</span> <span class="doccomment">/// extern crate serde_json;</span> <span class="doccomment">///</span> <span class="doccomment">/// #[macro_use]</span> <span class="doccomment">/// extern crate serde_derive;</span> <span class="doccomment">///</span> <span class="doccomment">/// extern crate serde;</span> <span class="doccomment">///</span> <span class="doccomment">/// #[derive(Deserialize, Debug)]</span> <span class="doccomment">/// struct User {</span> <span class="doccomment">/// fingerprint: String,</span> <span class="doccomment">/// location: String,</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// fn main() {</span> <span class="doccomment">/// // The type of `j` is `serde_json::Value`</span> <span class="doccomment">/// let j = json!({</span> <span class="doccomment">/// "fingerprint": "0xF9BA143B95FF6D82",</span> <span class="doccomment">/// "location": "Menlo Park, CA"</span> <span class="doccomment">/// });</span> <span class="doccomment">///</span> <span class="doccomment">/// let u: User = serde_json::from_value(j).unwrap();</span> <span class="doccomment">/// println!("{:#?}", u);</span> <span class="doccomment">/// }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_value</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">value</span>: <span class="ident">Value</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">Error</span><span class="op">></span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">DeserializeOwned</span>, { <span class="ident">T</span>::<span class="ident">deserialize</span>(<span class="ident">value</span>) } </pre> </section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g. <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../../../";window.currentCrate = "serde_json";</script><script src="../../../aliases.js"></script><script src="../../../main.js"></script><script defer src="../../../search-index.js"></script></body></html>