<!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">&#9776;</div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1">   1</span>
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</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 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, 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">//!       &quot;name&quot;: &quot;John Doe&quot;,</span>
<span class="doccomment">//!       &quot;age&quot;: 43,</span>
<span class="doccomment">//!       &quot;phones&quot;: [</span>
<span class="doccomment">//!         &quot;+44 1234567&quot;,</span>
<span class="doccomment">//!         &quot;+44 2345678&quot;</span>
<span class="doccomment">//!       ]</span>
<span class="doccomment">//!     });</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     println!(&quot;first phone number: {}&quot;, john[&quot;phones&quot;][0]);</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     // Convert to a string of JSON and print it out</span>
<span class="doccomment">//!     println!(&quot;{}&quot;, 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() -&gt; u16 { 0 }</span>
<span class="doccomment">//! #</span>
<span class="doccomment">//! # fn main() {</span>
<span class="doccomment">//! let full_name = &quot;John Doe&quot;;</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">//!   &quot;name&quot;: full_name,</span>
<span class="doccomment">//!   &quot;age&quot;: age_last_year + 1,</span>
<span class="doccomment">//!   &quot;phones&quot;: [</span>
<span class="doccomment">//!     format!(&quot;+44 {}&quot;, 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 `&amp;[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() -&gt; Result&lt;(), Error&gt; {</span>
<span class="doccomment">//!     // Some JSON input data as a &amp;str. Maybe this comes from the user.</span>
<span class="doccomment">//!     let data = r#&quot;{</span>
<span class="doccomment">//!                     &quot;name&quot;: &quot;John Doe&quot;,</span>
<span class="doccomment">//!                     &quot;age&quot;: 43,</span>
<span class="doccomment">//!                     &quot;phones&quot;: [</span>
<span class="doccomment">//!                       &quot;+44 1234567&quot;,</span>
<span class="doccomment">//!                       &quot;+44 2345678&quot;</span>
<span class="doccomment">//!                     ]</span>
<span class="doccomment">//!                   }&quot;#;</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!(&quot;Please call {} at the number {}&quot;, v[&quot;name&quot;], v[&quot;phones&quot;][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">&quot;raw_value&quot;</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!(&quot;a string&quot;);</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!([&quot;an&quot;, &quot;array&quot;]);</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="ident">Array</span>(<span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Value</span><span class="op">&gt;</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!({ &quot;an&quot;: &quot;object&quot; });</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="ident">Object</span>(<span class="ident">Map</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">Value</span><span class="op">&gt;</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">&amp;</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</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">=&gt;</span> <span class="ident">formatter</span>.<span class="ident">debug_tuple</span>(<span class="string">&quot;Null&quot;</span>).<span class="ident">finish</span>(),
            <span class="ident">Value</span>::<span class="ident">Bool</span>(<span class="ident">v</span>) <span class="op">=&gt;</span> <span class="ident">formatter</span>.<span class="ident">debug_tuple</span>(<span class="string">&quot;Bool&quot;</span>).<span class="ident">field</span>(<span class="kw-2">&amp;</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">=&gt;</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">=&gt;</span> <span class="ident">formatter</span>.<span class="ident">debug_tuple</span>(<span class="string">&quot;String&quot;</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">=&gt;</span> <span class="ident">formatter</span>.<span class="ident">debug_tuple</span>(<span class="string">&quot;Array&quot;</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">=&gt;</span> <span class="ident">formatter</span>.<span class="ident">debug_tuple</span>(<span class="string">&quot;Object&quot;</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">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;b</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="ident">inner</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span><span class="op">&lt;</span><span class="lifetime">&#39;b</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;b</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="ident">Write</span> <span class="kw">for</span> <span class="ident">WriterFormatter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;b</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
        <span class="kw">fn</span> <span class="ident">io_error</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="kw">_</span>: <span class="ident">E</span>) <span class="op">-&gt;</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">&quot;fmt error&quot;</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">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</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!({ &quot;city&quot;: &quot;London&quot;, &quot;street&quot;: &quot;10 Downing Street&quot; });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // Compact format:</span>
    <span class="doccomment">/// //</span>
    <span class="doccomment">/// // {&quot;city&quot;:&quot;London&quot;,&quot;street&quot;:&quot;10 Downing Street&quot;}</span>
    <span class="doccomment">/// let compact = format!(&quot;{}&quot;, json);</span>
    <span class="doccomment">/// assert_eq!(compact,</span>
    <span class="doccomment">///     &quot;{\&quot;city\&quot;:\&quot;London\&quot;,\&quot;street\&quot;:\&quot;10 Downing Street\&quot;}&quot;);</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // Pretty format:</span>
    <span class="doccomment">/// //</span>
    <span class="doccomment">/// // {</span>
    <span class="doccomment">/// //   &quot;city&quot;: &quot;London&quot;,</span>
    <span class="doccomment">/// //   &quot;street&quot;: &quot;10 Downing Street&quot;</span>
    <span class="doccomment">/// // }</span>
    <span class="doccomment">/// let pretty = format!(&quot;{:#}&quot;, json);</span>
    <span class="doccomment">/// assert_eq!(pretty,</span>
    <span class="doccomment">///     &quot;{\n  \&quot;city\&quot;: \&quot;London\&quot;,\n  \&quot;street\&quot;: \&quot;10 Downing Street\&quot;\n}&quot;);</span>
    <span class="doccomment">/// # }</span>
    <span class="doccomment">/// ```</span>
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</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">&amp;</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">&amp;</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">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
    <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">starts_with</span>(<span class="string">&#39;+&#39;</span>) <span class="op">||</span> (<span class="ident">s</span>.<span class="ident">starts_with</span>(<span class="string">&#39;0&#39;</span>) <span class="op">&amp;&amp;</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!({ &quot;A&quot;: 65, &quot;B&quot;: 66, &quot;C&quot;: 67 });</span>
    <span class="doccomment">/// assert_eq!(*object.get(&quot;A&quot;).unwrap(), json!(65));</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// let array = json!([ &quot;A&quot;, &quot;B&quot;, &quot;C&quot; ]);</span>
    <span class="doccomment">/// assert_eq!(*array.get(2).unwrap(), json!(&quot;C&quot;));</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert_eq!(array.get(&quot;A&quot;), 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">///     &quot;A&quot;: [&quot;a&quot;, &quot;á&quot;, &quot;à&quot;],</span>
    <span class="doccomment">///     &quot;B&quot;: [&quot;b&quot;, &quot;b́&quot;],</span>
    <span class="doccomment">///     &quot;C&quot;: [&quot;c&quot;, &quot;ć&quot;, &quot;ć̣&quot;, &quot;ḉ&quot;],</span>
    <span class="doccomment">/// });</span>
    <span class="doccomment">/// assert_eq!(object[&quot;B&quot;][0], json!(&quot;b&quot;));</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert_eq!(object[&quot;D&quot;], json!(null));</span>
    <span class="doccomment">/// assert_eq!(object[0][&quot;x&quot;][&quot;y&quot;][&quot;z&quot;], 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">&lt;</span><span class="ident">I</span>: <span class="ident">Index</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">I</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">Value</span><span class="op">&gt;</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!({ &quot;A&quot;: 65, &quot;B&quot;: 66, &quot;C&quot;: 67 });</span>
    <span class="doccomment">/// *object.get_mut(&quot;A&quot;).unwrap() = json!(69);</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// let mut array = json!([ &quot;A&quot;, &quot;B&quot;, &quot;C&quot; ]);</span>
    <span class="doccomment">/// *array.get_mut(2).unwrap() = json!(&quot;D&quot;);</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">&lt;</span><span class="ident">I</span>: <span class="ident">Index</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</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">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Value</span><span class="op">&gt;</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!({ &quot;a&quot;: { &quot;nested&quot;: true }, &quot;b&quot;: [&quot;an&quot;, &quot;array&quot;] });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert!(obj.is_object());</span>
    <span class="doccomment">/// assert!(obj[&quot;a&quot;].is_object());</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // array, not an object</span>
    <span class="doccomment">/// assert!(!obj[&quot;b&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</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!({ &quot;a&quot;: { &quot;nested&quot;: true }, &quot;b&quot;: [&quot;an&quot;, &quot;array&quot;] });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // The length of `{&quot;nested&quot;: true}` is 1 entry.</span>
    <span class="doccomment">/// assert_eq!(v[&quot;a&quot;].as_object().unwrap().len(), 1);</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // The array `[&quot;an&quot;, &quot;array&quot;]` is not an object.</span>
    <span class="doccomment">/// assert_eq!(v[&quot;b&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">Map</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">Value</span><span class="op">&gt;&gt;</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">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">map</span>),
            <span class="kw">_</span> <span class="op">=&gt;</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!({ &quot;a&quot;: { &quot;nested&quot;: true } });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// v[&quot;a&quot;].as_object_mut().unwrap().clear();</span>
    <span class="doccomment">/// assert_eq!(v, json!({ &quot;a&quot;: {} }));</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">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Map</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">Value</span><span class="op">&gt;&gt;</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">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">map</span>),
            <span class="kw">_</span> <span class="op">=&gt;</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!({ &quot;a&quot;: [&quot;an&quot;, &quot;array&quot;], &quot;b&quot;: { &quot;an&quot;: &quot;object&quot; } });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert!(obj[&quot;a&quot;].is_array());</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // an object, not an array</span>
    <span class="doccomment">/// assert!(!obj[&quot;b&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</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!({ &quot;a&quot;: [&quot;an&quot;, &quot;array&quot;], &quot;b&quot;: { &quot;an&quot;: &quot;object&quot; } });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // The length of `[&quot;an&quot;, &quot;array&quot;]` is 2 elements.</span>
    <span class="doccomment">/// assert_eq!(v[&quot;a&quot;].as_array().unwrap().len(), 2);</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // The object `{&quot;an&quot;: &quot;object&quot;}` is not an array.</span>
    <span class="doccomment">/// assert_eq!(v[&quot;b&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Value</span><span class="op">&gt;&gt;</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">=&gt;</span> <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="ident">array</span>),
            <span class="kw">_</span> <span class="op">=&gt;</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!({ &quot;a&quot;: [&quot;an&quot;, &quot;array&quot;] });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// v[&quot;a&quot;].as_array_mut().unwrap().clear();</span>
    <span class="doccomment">/// assert_eq!(v, json!({ &quot;a&quot;: [] }));</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">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Value</span><span class="op">&gt;&gt;</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">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">list</span>),
            <span class="kw">_</span> <span class="op">=&gt;</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!({ &quot;a&quot;: &quot;some string&quot;, &quot;b&quot;: false });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert!(v[&quot;a&quot;].is_string());</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // The boolean `false` is not a string.</span>
    <span class="doccomment">/// assert!(!v[&quot;b&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</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!({ &quot;a&quot;: &quot;some string&quot;, &quot;b&quot;: false });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert_eq!(v[&quot;a&quot;].as_str(), Some(&quot;some string&quot;));</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // The boolean `false` is not a string.</span>
    <span class="doccomment">/// assert_eq!(v[&quot;b&quot;].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: &quot;some string&quot;</span>
    <span class="doccomment">/// println!(&quot;The value is: {}&quot;, v[&quot;a&quot;]);</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!(&quot;The value is: {}&quot;, v[&quot;a&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</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">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">s</span>),
            <span class="kw">_</span> <span class="op">=&gt;</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!({ &quot;a&quot;: 1, &quot;b&quot;: &quot;2&quot; });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert!(v[&quot;a&quot;].is_number());</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // The string `&quot;2&quot;` is a string, not a number.</span>
    <span class="doccomment">/// assert!(!v[&quot;b&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</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">=&gt;</span> <span class="bool-val">true</span>,
            <span class="kw">_</span> <span class="op">=&gt;</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!({ &quot;a&quot;: 64, &quot;b&quot;: big, &quot;c&quot;: 256.0 });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert!(v[&quot;a&quot;].is_i64());</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // Greater than i64::MAX.</span>
    <span class="doccomment">/// assert!(!v[&quot;b&quot;].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[&quot;c&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</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">=&gt;</span> <span class="ident">n</span>.<span class="ident">is_i64</span>(),
            <span class="kw">_</span> <span class="op">=&gt;</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!({ &quot;a&quot;: 64, &quot;b&quot;: -64, &quot;c&quot;: 256.0 });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert!(v[&quot;a&quot;].is_u64());</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // Negative integer.</span>
    <span class="doccomment">/// assert!(!v[&quot;b&quot;].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[&quot;c&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</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">=&gt;</span> <span class="ident">n</span>.<span class="ident">is_u64</span>(),
            <span class="kw">_</span> <span class="op">=&gt;</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!({ &quot;a&quot;: 256.0, &quot;b&quot;: 64, &quot;c&quot;: -64 });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert!(v[&quot;a&quot;].is_f64());</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // Integers.</span>
    <span class="doccomment">/// assert!(!v[&quot;b&quot;].is_f64());</span>
    <span class="doccomment">/// assert!(!v[&quot;c&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</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">=&gt;</span> <span class="ident">n</span>.<span class="ident">is_f64</span>(),
            <span class="kw">_</span> <span class="op">=&gt;</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!({ &quot;a&quot;: 64, &quot;b&quot;: big, &quot;c&quot;: 256.0 });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert_eq!(v[&quot;a&quot;].as_i64(), Some(64));</span>
    <span class="doccomment">/// assert_eq!(v[&quot;b&quot;].as_i64(), None);</span>
    <span class="doccomment">/// assert_eq!(v[&quot;c&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i64</span><span class="op">&gt;</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">=&gt;</span> <span class="ident">n</span>.<span class="ident">as_i64</span>(),
            <span class="kw">_</span> <span class="op">=&gt;</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!({ &quot;a&quot;: 64, &quot;b&quot;: -64, &quot;c&quot;: 256.0 });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert_eq!(v[&quot;a&quot;].as_u64(), Some(64));</span>
    <span class="doccomment">/// assert_eq!(v[&quot;b&quot;].as_u64(), None);</span>
    <span class="doccomment">/// assert_eq!(v[&quot;c&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u64</span><span class="op">&gt;</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">=&gt;</span> <span class="ident">n</span>.<span class="ident">as_u64</span>(),
            <span class="kw">_</span> <span class="op">=&gt;</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!({ &quot;a&quot;: 256.0, &quot;b&quot;: 64, &quot;c&quot;: -64 });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert_eq!(v[&quot;a&quot;].as_f64(), Some(256.0));</span>
    <span class="doccomment">/// assert_eq!(v[&quot;b&quot;].as_f64(), Some(64.0));</span>
    <span class="doccomment">/// assert_eq!(v[&quot;c&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</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">=&gt;</span> <span class="ident">n</span>.<span class="ident">as_f64</span>(),
            <span class="kw">_</span> <span class="op">=&gt;</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!({ &quot;a&quot;: false, &quot;b&quot;: &quot;false&quot; });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert!(v[&quot;a&quot;].is_boolean());</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // The string `&quot;false&quot;` is a string, not a boolean.</span>
    <span class="doccomment">/// assert!(!v[&quot;b&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</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!({ &quot;a&quot;: false, &quot;b&quot;: &quot;false&quot; });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert_eq!(v[&quot;a&quot;].as_bool(), Some(false));</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // The string `&quot;false&quot;` is a string, not a boolean.</span>
    <span class="doccomment">/// assert_eq!(v[&quot;b&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</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">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">b</span>),
            <span class="kw">_</span> <span class="op">=&gt;</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!({ &quot;a&quot;: null, &quot;b&quot;: false });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert!(v[&quot;a&quot;].is_null());</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // The boolean `false` is not null.</span>
    <span class="doccomment">/// assert!(!v[&quot;b&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</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!({ &quot;a&quot;: null, &quot;b&quot;: false });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert_eq!(v[&quot;a&quot;].as_null(), Some(()));</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// // The boolean `false` is not null.</span>
    <span class="doccomment">/// assert_eq!(v[&quot;b&quot;].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">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>()<span class="op">&gt;</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">=&gt;</span> <span class="prelude-val">Some</span>(()),
            <span class="kw">_</span> <span class="op">=&gt;</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">///     &quot;x&quot;: {</span>
    <span class="doccomment">///         &quot;y&quot;: [&quot;z&quot;, &quot;zz&quot;]</span>
    <span class="doccomment">///     }</span>
    <span class="doccomment">/// });</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// assert_eq!(data.pointer(&quot;/x/y/1&quot;).unwrap(), &amp;json!(&quot;zz&quot;));</span>
    <span class="doccomment">/// assert_eq!(data.pointer(&quot;/a/b/c&quot;), 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">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>, <span class="ident">pointer</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Value</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="ident">pointer</span> <span class="op">==</span> <span class="string">&quot;&quot;</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">&#39;/&#39;</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">&#39;/&#39;</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">&quot;~1&quot;</span>, <span class="string">&quot;/&quot;</span>).<span class="ident">replace</span>(<span class="string">&quot;~0&quot;</span>, <span class="string">&quot;~&quot;</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">=&gt;</span> <span class="ident">map</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</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">=&gt;</span> <span class="ident">parse_index</span>(<span class="kw-2">&amp;</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">=&gt;</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#&quot;{&quot;x&quot;: 1.0, &quot;y&quot;: 2.0}&quot;#;</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(&quot;/x&quot;), Some(&amp;1.0.into()));</span>
    <span class="doccomment">///     // Change value with direct assignment</span>
    <span class="doccomment">///     *value.pointer_mut(&quot;/x&quot;).unwrap() = 1.5.into();</span>
    <span class="doccomment">///     // Check that new value was written</span>
    <span class="doccomment">///     assert_eq!(value.pointer(&quot;/x&quot;), Some(&amp;1.5.into()));</span>
    <span class="doccomment">///</span>
    <span class="doccomment">///     // &quot;Steal&quot; ownership of a value. Can replace with any valid Value.</span>
    <span class="doccomment">///     let old_x = value.pointer_mut(&quot;/x&quot;).map(Value::take).unwrap();</span>
    <span class="doccomment">///     assert_eq!(old_x, 1.5);</span>
    <span class="doccomment">///     assert_eq!(value.pointer(&quot;/x&quot;).unwrap(), &amp;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">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">pointer</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">Value</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="ident">pointer</span> <span class="op">==</span> <span class="string">&quot;&quot;</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">&#39;/&#39;</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">&#39;/&#39;</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">&quot;~1&quot;</span>, <span class="string">&quot;/&quot;</span>).<span class="ident">replace</span>(<span class="string">&quot;~0&quot;</span>, <span class="string">&quot;~&quot;</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">=&gt;</span> <span class="ident">map</span>.<span class="ident">get_mut</span>(<span class="kw-2">&amp;</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">=&gt;</span> {
                    <span class="ident">parse_index</span>(<span class="kw-2">&amp;</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">=&gt;</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!({ &quot;x&quot;: &quot;y&quot; });</span>
    <span class="doccomment">/// assert_eq!(v[&quot;x&quot;].take(), json!(&quot;y&quot;));</span>
    <span class="doccomment">/// assert_eq!(v, json!({ &quot;x&quot;: 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">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</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() -&gt; Result&lt;(), serde_json::Error&gt; {</span>
<span class="doccomment">/// let data = r#&quot; { &quot;level&quot;: 42 } &quot;#;</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">-&gt;</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() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {</span>
<span class="doccomment">///     let u = User {</span>
<span class="doccomment">///         fingerprint: &quot;0xF9BA143B95FF6D82&quot;.to_owned(),</span>
<span class="doccomment">///         location: &quot;Menlo Park, CA&quot;.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">///                            &quot;fingerprint&quot;: &quot;0xF9BA143B95FF6D82&quot;,</span>
<span class="doccomment">///                            &quot;location&quot;: &quot;Menlo Park, CA&quot;,</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`&#39;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], &quot;x86&quot;);</span>
<span class="doccomment">///</span>
<span class="doccomment">///     println!(&quot;{}&quot;, 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">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="ident">value</span>: <span class="ident">T</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Value</span>, <span class="ident">Error</span><span class="op">&gt;</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`&#39;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">///                     &quot;fingerprint&quot;: &quot;0xF9BA143B95FF6D82&quot;,</span>
<span class="doccomment">///                     &quot;location&quot;: &quot;Menlo Park, CA&quot;</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!(&quot;{:#?}&quot;, 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">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="ident">value</span>: <span class="ident">Value</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">Error</span><span class="op">&gt;</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>
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