| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/serde_json-1.0.96/src/value/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../serde_json/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../serde_json/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| <span id="985">985</span> |
| <span id="986">986</span> |
| <span id="987">987</span> |
| </pre><pre class="rust"><code><span class="doccomment">//! The Value enum, a loosely typed way of representing any valid JSON value. |
| //! |
| //! # Constructing JSON |
| //! |
| //! Serde JSON provides a [`json!` macro][macro] to build `serde_json::Value` |
| //! objects with very natural JSON syntax. |
| //! |
| //! ``` |
| //! use serde_json::json; |
| //! |
| //! fn main() { |
| //! // The type of `john` is `serde_json::Value` |
| //! let john = json!({ |
| //! "name": "John Doe", |
| //! "age": 43, |
| //! "phones": [ |
| //! "+44 1234567", |
| //! "+44 2345678" |
| //! ] |
| //! }); |
| //! |
| //! println!("first phone number: {}", john["phones"][0]); |
| //! |
| //! // Convert to a string of JSON and print it out |
| //! println!("{}", john.to_string()); |
| //! } |
| //! ``` |
| //! |
| //! The `Value::to_string()` function converts a `serde_json::Value` into a |
| //! `String` of JSON text. |
| //! |
| //! One neat thing about the `json!` macro is that variables and expressions can |
| //! be interpolated directly into the JSON value as you are building it. Serde |
| //! will check at compile time that the value you are interpolating is able to |
| //! be represented as JSON. |
| //! |
| //! ``` |
| //! # use serde_json::json; |
| //! # |
| //! # fn random_phone() -> u16 { 0 } |
| //! # |
| //! let full_name = "John Doe"; |
| //! let age_last_year = 42; |
| //! |
| //! // The type of `john` is `serde_json::Value` |
| //! let john = json!({ |
| //! "name": full_name, |
| //! "age": age_last_year + 1, |
| //! "phones": [ |
| //! format!("+44 {}", random_phone()) |
| //! ] |
| //! }); |
| //! ``` |
| //! |
| //! A string of JSON data can be parsed into a `serde_json::Value` by the |
| //! [`serde_json::from_str`][from_str] function. There is also |
| //! [`from_slice`][from_slice] for parsing from a byte slice `&[u8]` and |
| //! [`from_reader`][from_reader] for parsing from any `io::Read` like a File or |
| //! a TCP stream. |
| //! |
| //! ``` |
| //! use serde_json::{json, Value, Error}; |
| //! |
| //! fn untyped_example() -> Result<(), Error> { |
| //! // Some JSON input data as a &str. Maybe this comes from the user. |
| //! let data = r#" |
| //! { |
| //! "name": "John Doe", |
| //! "age": 43, |
| //! "phones": [ |
| //! "+44 1234567", |
| //! "+44 2345678" |
| //! ] |
| //! }"#; |
| //! |
| //! // Parse the string of data into serde_json::Value. |
| //! let v: Value = serde_json::from_str(data)?; |
| //! |
| //! // Access parts of the data by indexing with square brackets. |
| //! println!("Please call {} at the number {}", v["name"], v["phones"][0]); |
| //! |
| //! Ok(()) |
| //! } |
| //! # |
| //! # untyped_example().unwrap(); |
| //! ``` |
| //! |
| //! [macro]: crate::json |
| //! [from_str]: crate::de::from_str |
| //! [from_slice]: crate::de::from_slice |
| //! [from_reader]: crate::de::from_reader |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::error::Error; |
| <span class="kw">use </span><span class="kw">crate</span>::io; |
| <span class="kw">use </span>alloc::string::String; |
| <span class="kw">use </span>alloc::vec::Vec; |
| <span class="kw">use </span>core::fmt::{<span class="self">self</span>, Debug, Display}; |
| <span class="kw">use </span>core::mem; |
| <span class="kw">use </span>core::str; |
| <span class="kw">use </span>serde::de::DeserializeOwned; |
| <span class="kw">use </span>serde::ser::Serialize; |
| |
| <span class="kw">pub use </span><span class="self">self</span>::index::Index; |
| <span class="kw">pub use </span><span class="self">self</span>::ser::Serializer; |
| <span class="kw">pub use </span><span class="kw">crate</span>::map::Map; |
| <span class="kw">pub use </span><span class="kw">crate</span>::number::Number; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"raw_value"</span>)] |
| </span><span class="kw">pub use </span><span class="kw">crate</span>::raw::{to_raw_value, RawValue}; |
| |
| <span class="doccomment">/// Represents any valid JSON value. |
| /// |
| /// See the [`serde_json::value` module documentation](self) for usage examples. |
| </span><span class="attribute">#[derive(Clone, Eq, PartialEq)] |
| </span><span class="kw">pub enum </span>Value { |
| <span class="doccomment">/// Represents a JSON null value. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!(null); |
| /// ``` |
| </span>Null, |
| |
| <span class="doccomment">/// Represents a JSON boolean. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!(true); |
| /// ``` |
| </span>Bool(bool), |
| |
| <span class="doccomment">/// Represents a JSON number, whether integer or floating point. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!(12.5); |
| /// ``` |
| </span>Number(Number), |
| |
| <span class="doccomment">/// Represents a JSON string. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!("a string"); |
| /// ``` |
| </span>String(String), |
| |
| <span class="doccomment">/// Represents a JSON array. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!(["an", "array"]); |
| /// ``` |
| </span>Array(Vec<Value>), |
| |
| <span class="doccomment">/// Represents a JSON object. |
| /// |
| /// By default the map is backed by a BTreeMap. Enable the `preserve_order` |
| /// feature of serde_json to use IndexMap instead, which preserves |
| /// entries in the order they are inserted into the map. In particular, this |
| /// allows JSON data to be deserialized into a Value and serialized to a |
| /// string while retaining the order of map keys in the input. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "an": "object" }); |
| /// ``` |
| </span>Object(Map<String, Value>), |
| } |
| |
| <span class="kw">impl </span>Debug <span class="kw">for </span>Value { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, formatter: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Value::Null => formatter.write_str(<span class="string">"Null"</span>), |
| Value::Bool(boolean) => <span class="macro">write!</span>(formatter, <span class="string">"Bool({})"</span>, boolean), |
| Value::Number(number) => Debug::fmt(number, formatter), |
| Value::String(string) => <span class="macro">write!</span>(formatter, <span class="string">"String({:?})"</span>, string), |
| Value::Array(vec) => { |
| formatter.write_str(<span class="string">"Array "</span>)<span class="question-mark">?</span>; |
| Debug::fmt(vec, formatter) |
| } |
| Value::Object(map) => { |
| formatter.write_str(<span class="string">"Object "</span>)<span class="question-mark">?</span>; |
| Debug::fmt(map, formatter) |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Display <span class="kw">for </span>Value { |
| <span class="doccomment">/// Display a JSON value as a string. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let json = json!({ "city": "London", "street": "10 Downing Street" }); |
| /// |
| /// // Compact format: |
| /// // |
| /// // {"city":"London","street":"10 Downing Street"} |
| /// let compact = format!("{}", json); |
| /// assert_eq!(compact, |
| /// "{\"city\":\"London\",\"street\":\"10 Downing Street\"}"); |
| /// |
| /// // Pretty format: |
| /// // |
| /// // { |
| /// // "city": "London", |
| /// // "street": "10 Downing Street" |
| /// // } |
| /// let pretty = format!("{:#}", json); |
| /// assert_eq!(pretty, |
| /// "{\n \"city\": \"London\",\n \"street\": \"10 Downing Street\"\n}"); |
| /// ``` |
| </span><span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">struct </span>WriterFormatter<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>: <span class="lifetime">'a</span>> { |
| inner: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>fmt::Formatter<<span class="lifetime">'b</span>>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, <span class="lifetime">'b</span>> io::Write <span class="kw">for </span>WriterFormatter<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>> { |
| <span class="kw">fn </span>write(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span>[u8]) -> io::Result<usize> { |
| <span class="comment">// Safety: the serializer below only emits valid utf8 when using |
| // the default formatter. |
| </span><span class="kw">let </span>s = <span class="kw">unsafe </span>{ str::from_utf8_unchecked(buf) }; |
| <span class="macro">tri!</span>(<span class="self">self</span>.inner.write_str(s).map_err(io_error)); |
| <span class="prelude-val">Ok</span>(buf.len()) |
| } |
| |
| <span class="kw">fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">fn </span>io_error(<span class="kw">_</span>: fmt::Error) -> io::Error { |
| <span class="comment">// Error value does not matter because Display impl just maps it |
| // back to fmt::Error. |
| </span>io::Error::new(io::ErrorKind::Other, <span class="string">"fmt error"</span>) |
| } |
| |
| <span class="kw">let </span>alternate = f.alternate(); |
| <span class="kw">let </span><span class="kw-2">mut </span>wr = WriterFormatter { inner: f }; |
| <span class="kw">if </span>alternate { |
| <span class="comment">// {:#} |
| </span><span class="kw">super</span>::ser::to_writer_pretty(<span class="kw-2">&mut </span>wr, <span class="self">self</span>).map_err(|<span class="kw">_</span>| fmt::Error) |
| } <span class="kw">else </span>{ |
| <span class="comment">// {} |
| </span><span class="kw">super</span>::ser::to_writer(<span class="kw-2">&mut </span>wr, <span class="self">self</span>).map_err(|<span class="kw">_</span>| fmt::Error) |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>parse_index(s: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">if </span>s.starts_with(<span class="string">'+'</span>) || (s.starts_with(<span class="string">'0'</span>) && s.len() != <span class="number">1</span>) { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| s.parse().ok() |
| } |
| |
| <span class="kw">impl </span>Value { |
| <span class="doccomment">/// Index into a JSON array or map. A string index can be used to access a |
| /// value in a map, and a usize index can be used to access an element of an |
| /// array. |
| /// |
| /// Returns `None` if the type of `self` does not match the type of the |
| /// index, for example if the index is a string and `self` is an array or a |
| /// number. Also returns `None` if the given key does not exist in the map |
| /// or the given index is not within the bounds of the array. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let object = json!({ "A": 65, "B": 66, "C": 67 }); |
| /// assert_eq!(*object.get("A").unwrap(), json!(65)); |
| /// |
| /// let array = json!([ "A", "B", "C" ]); |
| /// assert_eq!(*array.get(2).unwrap(), json!("C")); |
| /// |
| /// assert_eq!(array.get("A"), None); |
| /// ``` |
| /// |
| /// Square brackets can also be used to index into a value in a more concise |
| /// way. This returns `Value::Null` in cases where `get` would have returned |
| /// `None`. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let object = json!({ |
| /// "A": ["a", "á", "à"], |
| /// "B": ["b", "b́"], |
| /// "C": ["c", "ć", "ć̣", "ḉ"], |
| /// }); |
| /// assert_eq!(object["B"][0], json!("b")); |
| /// |
| /// assert_eq!(object["D"], json!(null)); |
| /// assert_eq!(object[0]["x"]["y"]["z"], json!(null)); |
| /// ``` |
| </span><span class="kw">pub fn </span>get<I: Index>(<span class="kw-2">&</span><span class="self">self</span>, index: I) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Value> { |
| index.index_into(<span class="self">self</span>) |
| } |
| |
| <span class="doccomment">/// Mutably index into a JSON array or map. A string index can be used to |
| /// access a value in a map, and a usize index can be used to access an |
| /// element of an array. |
| /// |
| /// Returns `None` if the type of `self` does not match the type of the |
| /// index, for example if the index is a string and `self` is an array or a |
| /// number. Also returns `None` if the given key does not exist in the map |
| /// or the given index is not within the bounds of the array. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let mut object = json!({ "A": 65, "B": 66, "C": 67 }); |
| /// *object.get_mut("A").unwrap() = json!(69); |
| /// |
| /// let mut array = json!([ "A", "B", "C" ]); |
| /// *array.get_mut(2).unwrap() = json!("D"); |
| /// ``` |
| </span><span class="kw">pub fn </span>get_mut<I: Index>(<span class="kw-2">&mut </span><span class="self">self</span>, index: I) -> <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>Value> { |
| index.index_into_mut(<span class="self">self</span>) |
| } |
| |
| <span class="doccomment">/// Returns true if the `Value` is an Object. Returns false otherwise. |
| /// |
| /// For any Value on which `is_object` returns true, `as_object` and |
| /// `as_object_mut` are guaranteed to return the map representation of the |
| /// object. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let obj = json!({ "a": { "nested": true }, "b": ["an", "array"] }); |
| /// |
| /// assert!(obj.is_object()); |
| /// assert!(obj["a"].is_object()); |
| /// |
| /// // array, not an object |
| /// assert!(!obj["b"].is_object()); |
| /// ``` |
| </span><span class="kw">pub fn </span>is_object(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.as_object().is_some() |
| } |
| |
| <span class="doccomment">/// If the `Value` is an Object, returns the associated Map. Returns None |
| /// otherwise. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "a": { "nested": true }, "b": ["an", "array"] }); |
| /// |
| /// // The length of `{"nested": true}` is 1 entry. |
| /// assert_eq!(v["a"].as_object().unwrap().len(), 1); |
| /// |
| /// // The array `["an", "array"]` is not an object. |
| /// assert_eq!(v["b"].as_object(), None); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_object(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Map<String, Value>> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Value::Object(map) => <span class="prelude-val">Some</span>(map), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// If the `Value` is an Object, returns the associated mutable Map. |
| /// Returns None otherwise. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let mut v = json!({ "a": { "nested": true } }); |
| /// |
| /// v["a"].as_object_mut().unwrap().clear(); |
| /// assert_eq!(v, json!({ "a": {} })); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_object_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>Map<String, Value>> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Value::Object(map) => <span class="prelude-val">Some</span>(map), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if the `Value` is an Array. Returns false otherwise. |
| /// |
| /// For any Value on which `is_array` returns true, `as_array` and |
| /// `as_array_mut` are guaranteed to return the vector representing the |
| /// array. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let obj = json!({ "a": ["an", "array"], "b": { "an": "object" } }); |
| /// |
| /// assert!(obj["a"].is_array()); |
| /// |
| /// // an object, not an array |
| /// assert!(!obj["b"].is_array()); |
| /// ``` |
| </span><span class="kw">pub fn </span>is_array(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.as_array().is_some() |
| } |
| |
| <span class="doccomment">/// If the `Value` is an Array, returns the associated vector. Returns None |
| /// otherwise. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "a": ["an", "array"], "b": { "an": "object" } }); |
| /// |
| /// // The length of `["an", "array"]` is 2 elements. |
| /// assert_eq!(v["a"].as_array().unwrap().len(), 2); |
| /// |
| /// // The object `{"an": "object"}` is not an array. |
| /// assert_eq!(v["b"].as_array(), None); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_array(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Vec<Value>> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Value::Array(array) => <span class="prelude-val">Some</span>(array), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// If the `Value` is an Array, returns the associated mutable vector. |
| /// Returns None otherwise. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let mut v = json!({ "a": ["an", "array"] }); |
| /// |
| /// v["a"].as_array_mut().unwrap().clear(); |
| /// assert_eq!(v, json!({ "a": [] })); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_array_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>Vec<Value>> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Value::Array(list) => <span class="prelude-val">Some</span>(list), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if the `Value` is a String. Returns false otherwise. |
| /// |
| /// For any Value on which `is_string` returns true, `as_str` is guaranteed |
| /// to return the string slice. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "a": "some string", "b": false }); |
| /// |
| /// assert!(v["a"].is_string()); |
| /// |
| /// // The boolean `false` is not a string. |
| /// assert!(!v["b"].is_string()); |
| /// ``` |
| </span><span class="kw">pub fn </span>is_string(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.as_str().is_some() |
| } |
| |
| <span class="doccomment">/// If the `Value` is a String, returns the associated str. Returns None |
| /// otherwise. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "a": "some string", "b": false }); |
| /// |
| /// assert_eq!(v["a"].as_str(), Some("some string")); |
| /// |
| /// // The boolean `false` is not a string. |
| /// assert_eq!(v["b"].as_str(), None); |
| /// |
| /// // JSON values are printed in JSON representation, so strings are in quotes. |
| /// // |
| /// // The value is: "some string" |
| /// println!("The value is: {}", v["a"]); |
| /// |
| /// // Rust strings are printed without quotes. |
| /// // |
| /// // The value is: some string |
| /// println!("The value is: {}", v["a"].as_str().unwrap()); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_str(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>str> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Value::String(s) => <span class="prelude-val">Some</span>(s), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if the `Value` is a Number. Returns false otherwise. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "a": 1, "b": "2" }); |
| /// |
| /// assert!(v["a"].is_number()); |
| /// |
| /// // The string `"2"` is a string, not a number. |
| /// assert!(!v["b"].is_number()); |
| /// ``` |
| </span><span class="kw">pub fn </span>is_number(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Value::Number(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if the `Value` is an integer between `i64::MIN` and |
| /// `i64::MAX`. |
| /// |
| /// For any Value on which `is_i64` returns true, `as_i64` is guaranteed to |
| /// return the integer value. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let big = i64::max_value() as u64 + 10; |
| /// let v = json!({ "a": 64, "b": big, "c": 256.0 }); |
| /// |
| /// assert!(v["a"].is_i64()); |
| /// |
| /// // Greater than i64::MAX. |
| /// assert!(!v["b"].is_i64()); |
| /// |
| /// // Numbers with a decimal point are not considered integers. |
| /// assert!(!v["c"].is_i64()); |
| /// ``` |
| </span><span class="kw">pub fn </span>is_i64(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Value::Number(n) => n.is_i64(), |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if the `Value` is an integer between zero and `u64::MAX`. |
| /// |
| /// For any Value on which `is_u64` returns true, `as_u64` is guaranteed to |
| /// return the integer value. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "a": 64, "b": -64, "c": 256.0 }); |
| /// |
| /// assert!(v["a"].is_u64()); |
| /// |
| /// // Negative integer. |
| /// assert!(!v["b"].is_u64()); |
| /// |
| /// // Numbers with a decimal point are not considered integers. |
| /// assert!(!v["c"].is_u64()); |
| /// ``` |
| </span><span class="kw">pub fn </span>is_u64(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Value::Number(n) => n.is_u64(), |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if the `Value` is a number that can be represented by f64. |
| /// |
| /// For any Value on which `is_f64` returns true, `as_f64` is guaranteed to |
| /// return the floating point value. |
| /// |
| /// Currently this function returns true if and only if both `is_i64` and |
| /// `is_u64` return false but this is not a guarantee in the future. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "a": 256.0, "b": 64, "c": -64 }); |
| /// |
| /// assert!(v["a"].is_f64()); |
| /// |
| /// // Integers. |
| /// assert!(!v["b"].is_f64()); |
| /// assert!(!v["c"].is_f64()); |
| /// ``` |
| </span><span class="kw">pub fn </span>is_f64(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Value::Number(n) => n.is_f64(), |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// If the `Value` is an integer, represent it as i64 if possible. Returns |
| /// None otherwise. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let big = i64::max_value() as u64 + 10; |
| /// let v = json!({ "a": 64, "b": big, "c": 256.0 }); |
| /// |
| /// assert_eq!(v["a"].as_i64(), Some(64)); |
| /// assert_eq!(v["b"].as_i64(), None); |
| /// assert_eq!(v["c"].as_i64(), None); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_i64(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><i64> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Value::Number(n) => n.as_i64(), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// If the `Value` is an integer, represent it as u64 if possible. Returns |
| /// None otherwise. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "a": 64, "b": -64, "c": 256.0 }); |
| /// |
| /// assert_eq!(v["a"].as_u64(), Some(64)); |
| /// assert_eq!(v["b"].as_u64(), None); |
| /// assert_eq!(v["c"].as_u64(), None); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_u64(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><u64> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Value::Number(n) => n.as_u64(), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// If the `Value` is a number, represent it as f64 if possible. Returns |
| /// None otherwise. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "a": 256.0, "b": 64, "c": -64 }); |
| /// |
| /// assert_eq!(v["a"].as_f64(), Some(256.0)); |
| /// assert_eq!(v["b"].as_f64(), Some(64.0)); |
| /// assert_eq!(v["c"].as_f64(), Some(-64.0)); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_f64(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><f64> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Value::Number(n) => n.as_f64(), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if the `Value` is a Boolean. Returns false otherwise. |
| /// |
| /// For any Value on which `is_boolean` returns true, `as_bool` is |
| /// guaranteed to return the boolean value. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "a": false, "b": "false" }); |
| /// |
| /// assert!(v["a"].is_boolean()); |
| /// |
| /// // The string `"false"` is a string, not a boolean. |
| /// assert!(!v["b"].is_boolean()); |
| /// ``` |
| </span><span class="kw">pub fn </span>is_boolean(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.as_bool().is_some() |
| } |
| |
| <span class="doccomment">/// If the `Value` is a Boolean, returns the associated bool. Returns None |
| /// otherwise. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "a": false, "b": "false" }); |
| /// |
| /// assert_eq!(v["a"].as_bool(), Some(false)); |
| /// |
| /// // The string `"false"` is a string, not a boolean. |
| /// assert_eq!(v["b"].as_bool(), None); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_bool(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><bool> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Value::Bool(b) => <span class="prelude-val">Some</span>(b), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if the `Value` is a Null. Returns false otherwise. |
| /// |
| /// For any Value on which `is_null` returns true, `as_null` is guaranteed |
| /// to return `Some(())`. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "a": null, "b": false }); |
| /// |
| /// assert!(v["a"].is_null()); |
| /// |
| /// // The boolean `false` is not null. |
| /// assert!(!v["b"].is_null()); |
| /// ``` |
| </span><span class="kw">pub fn </span>is_null(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.as_null().is_some() |
| } |
| |
| <span class="doccomment">/// If the `Value` is a Null, returns (). Returns None otherwise. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let v = json!({ "a": null, "b": false }); |
| /// |
| /// assert_eq!(v["a"].as_null(), Some(())); |
| /// |
| /// // The boolean `false` is not null. |
| /// assert_eq!(v["b"].as_null(), None); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_null(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><()> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Value::Null => <span class="prelude-val">Some</span>(()), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Looks up a value by a JSON Pointer. |
| /// |
| /// JSON Pointer defines a string syntax for identifying a specific value |
| /// within a JavaScript Object Notation (JSON) document. |
| /// |
| /// A Pointer is a Unicode string with the reference tokens separated by `/`. |
| /// Inside tokens `/` is replaced by `~1` and `~` is replaced by `~0`. The |
| /// addressed value is returned and if there is no such value `None` is |
| /// returned. |
| /// |
| /// For more information read [RFC6901](https://tools.ietf.org/html/rfc6901). |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let data = json!({ |
| /// "x": { |
| /// "y": ["z", "zz"] |
| /// } |
| /// }); |
| /// |
| /// assert_eq!(data.pointer("/x/y/1").unwrap(), &json!("zz")); |
| /// assert_eq!(data.pointer("/a/b/c"), None); |
| /// ``` |
| </span><span class="kw">pub fn </span>pointer(<span class="kw-2">&</span><span class="self">self</span>, pointer: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Value> { |
| <span class="kw">if </span>pointer.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="self">self</span>); |
| } |
| <span class="kw">if </span>!pointer.starts_with(<span class="string">'/'</span>) { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| pointer |
| .split(<span class="string">'/'</span>) |
| .skip(<span class="number">1</span>) |
| .map(|x| x.replace(<span class="string">"~1"</span>, <span class="string">"/"</span>).replace(<span class="string">"~0"</span>, <span class="string">"~"</span>)) |
| .try_fold(<span class="self">self</span>, |target, token| <span class="kw">match </span>target { |
| Value::Object(map) => map.get(<span class="kw-2">&</span>token), |
| Value::Array(list) => parse_index(<span class="kw-2">&</span>token).and_then(|x| list.get(x)), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| }) |
| } |
| |
| <span class="doccomment">/// Looks up a value by a JSON Pointer and returns a mutable reference to |
| /// that value. |
| /// |
| /// JSON Pointer defines a string syntax for identifying a specific value |
| /// within a JavaScript Object Notation (JSON) document. |
| /// |
| /// A Pointer is a Unicode string with the reference tokens separated by `/`. |
| /// Inside tokens `/` is replaced by `~1` and `~` is replaced by `~0`. The |
| /// addressed value is returned and if there is no such value `None` is |
| /// returned. |
| /// |
| /// For more information read [RFC6901](https://tools.ietf.org/html/rfc6901). |
| /// |
| /// # Example of Use |
| /// |
| /// ``` |
| /// use serde_json::Value; |
| /// |
| /// fn main() { |
| /// let s = r#"{"x": 1.0, "y": 2.0}"#; |
| /// let mut value: Value = serde_json::from_str(s).unwrap(); |
| /// |
| /// // Check value using read-only pointer |
| /// assert_eq!(value.pointer("/x"), Some(&1.0.into())); |
| /// // Change value with direct assignment |
| /// *value.pointer_mut("/x").unwrap() = 1.5.into(); |
| /// // Check that new value was written |
| /// assert_eq!(value.pointer("/x"), Some(&1.5.into())); |
| /// // Or change the value only if it exists |
| /// value.pointer_mut("/x").map(|v| *v = 1.5.into()); |
| /// |
| /// // "Steal" ownership of a value. Can replace with any valid Value. |
| /// let old_x = value.pointer_mut("/x").map(Value::take).unwrap(); |
| /// assert_eq!(old_x, 1.5); |
| /// assert_eq!(value.pointer("/x").unwrap(), &Value::Null); |
| /// } |
| /// ``` |
| </span><span class="kw">pub fn </span>pointer_mut(<span class="kw-2">&mut </span><span class="self">self</span>, pointer: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>Value> { |
| <span class="kw">if </span>pointer.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="self">self</span>); |
| } |
| <span class="kw">if </span>!pointer.starts_with(<span class="string">'/'</span>) { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| pointer |
| .split(<span class="string">'/'</span>) |
| .skip(<span class="number">1</span>) |
| .map(|x| x.replace(<span class="string">"~1"</span>, <span class="string">"/"</span>).replace(<span class="string">"~0"</span>, <span class="string">"~"</span>)) |
| .try_fold(<span class="self">self</span>, |target, token| <span class="kw">match </span>target { |
| Value::Object(map) => map.get_mut(<span class="kw-2">&</span>token), |
| Value::Array(list) => parse_index(<span class="kw-2">&</span>token).and_then(<span class="kw">move </span>|x| list.get_mut(x)), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| }) |
| } |
| |
| <span class="doccomment">/// Takes the value out of the `Value`, leaving a `Null` in its place. |
| /// |
| /// ``` |
| /// # use serde_json::json; |
| /// # |
| /// let mut v = json!({ "x": "y" }); |
| /// assert_eq!(v["x"].take(), json!("y")); |
| /// assert_eq!(v, json!({ "x": null })); |
| /// ``` |
| </span><span class="kw">pub fn </span>take(<span class="kw-2">&mut </span><span class="self">self</span>) -> Value { |
| mem::replace(<span class="self">self</span>, Value::Null) |
| } |
| } |
| |
| <span class="doccomment">/// The default value is `Value::Null`. |
| /// |
| /// This is useful for handling omitted `Value` fields when deserializing. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use serde::Deserialize; |
| /// use serde_json::Value; |
| /// |
| /// #[derive(Deserialize)] |
| /// struct Settings { |
| /// level: i32, |
| /// #[serde(default)] |
| /// extras: Value, |
| /// } |
| /// |
| /// # fn try_main() -> Result<(), serde_json::Error> { |
| /// let data = r#" { "level": 42 } "#; |
| /// let s: Settings = serde_json::from_str(data)?; |
| /// |
| /// assert_eq!(s.level, 42); |
| /// assert_eq!(s.extras, Value::Null); |
| /// # |
| /// # Ok(()) |
| /// # } |
| /// # |
| /// # try_main().unwrap() |
| /// ``` |
| </span><span class="kw">impl </span>Default <span class="kw">for </span>Value { |
| <span class="kw">fn </span>default() -> Value { |
| Value::Null |
| } |
| } |
| |
| <span class="kw">mod </span>de; |
| <span class="kw">mod </span>from; |
| <span class="kw">mod </span>index; |
| <span class="kw">mod </span>partial_eq; |
| <span class="kw">mod </span>ser; |
| |
| <span class="doccomment">/// Convert a `T` into `serde_json::Value` which is an enum that can represent |
| /// any valid JSON data. |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// use serde::Serialize; |
| /// use serde_json::json; |
| /// |
| /// use std::error::Error; |
| /// |
| /// #[derive(Serialize)] |
| /// struct User { |
| /// fingerprint: String, |
| /// location: String, |
| /// } |
| /// |
| /// fn compare_json_values() -> Result<(), Box<Error>> { |
| /// let u = User { |
| /// fingerprint: "0xF9BA143B95FF6D82".to_owned(), |
| /// location: "Menlo Park, CA".to_owned(), |
| /// }; |
| /// |
| /// // The type of `expected` is `serde_json::Value` |
| /// let expected = json!({ |
| /// "fingerprint": "0xF9BA143B95FF6D82", |
| /// "location": "Menlo Park, CA", |
| /// }); |
| /// |
| /// let v = serde_json::to_value(u).unwrap(); |
| /// assert_eq!(v, expected); |
| /// |
| /// Ok(()) |
| /// } |
| /// # |
| /// # compare_json_values().unwrap(); |
| /// ``` |
| /// |
| /// # Errors |
| /// |
| /// This conversion can fail if `T`'s implementation of `Serialize` decides to |
| /// fail, or if `T` contains a map with non-string keys. |
| /// |
| /// ``` |
| /// use std::collections::BTreeMap; |
| /// |
| /// fn main() { |
| /// // The keys in this map are vectors, not strings. |
| /// let mut map = BTreeMap::new(); |
| /// map.insert(vec![32, 64], "x86"); |
| /// |
| /// println!("{}", serde_json::to_value(map).unwrap_err()); |
| /// } |
| /// ``` |
| </span><span class="comment">// Taking by value is more friendly to iterator adapters, option and result |
| // consumers, etc. See https://github.com/serde-rs/json/pull/149. |
| </span><span class="kw">pub fn </span>to_value<T>(value: T) -> <span class="prelude-ty">Result</span><Value, Error> |
| <span class="kw">where |
| </span>T: Serialize, |
| { |
| value.serialize(Serializer) |
| } |
| |
| <span class="doccomment">/// Interpret a `serde_json::Value` as an instance of type `T`. |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// use serde::Deserialize; |
| /// use serde_json::json; |
| /// |
| /// #[derive(Deserialize, Debug)] |
| /// struct User { |
| /// fingerprint: String, |
| /// location: String, |
| /// } |
| /// |
| /// fn main() { |
| /// // The type of `j` is `serde_json::Value` |
| /// let j = json!({ |
| /// "fingerprint": "0xF9BA143B95FF6D82", |
| /// "location": "Menlo Park, CA" |
| /// }); |
| /// |
| /// let u: User = serde_json::from_value(j).unwrap(); |
| /// println!("{:#?}", u); |
| /// } |
| /// ``` |
| /// |
| /// # Errors |
| /// |
| /// This conversion can fail if the structure of the Value does not match the |
| /// structure expected by `T`, for example if `T` is a struct type but the Value |
| /// contains something other than a JSON map. It can also fail if the structure |
| /// is correct but `T`'s implementation of `Deserialize` decides that something |
| /// is wrong with the data, for example required struct fields are missing from |
| /// the JSON map or some number is too big to fit in the expected primitive |
| /// type. |
| </span><span class="kw">pub fn </span>from_value<T>(value: Value) -> <span class="prelude-ty">Result</span><T, Error> |
| <span class="kw">where |
| </span>T: DeserializeOwned, |
| { |
| T::deserialize(value) |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="serde_json" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
