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</pre><pre class='rust '>
<span class='doccomment'>//! Generic data structure deserialization framework.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! The two most important traits in this module are `Deserialize` and</span>
<span class='doccomment'>//! `Deserializer`.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! - **A type that implements `Deserialize` is a data structure** that can be</span>
<span class='doccomment'>//! deserialized from any data format supported by Serde, and conversely</span>
<span class='doccomment'>//! - **A type that implements `Deserializer` is a data format** that can</span>
<span class='doccomment'>//! deserialize any data structure supported by Serde.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # The Deserialize trait</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Serde provides `Deserialize` implementations for many Rust primitive and</span>
<span class='doccomment'>//! standard library types. The complete list is below. All of these can be</span>
<span class='doccomment'>//! deserialized using Serde out of the box.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Additionally, Serde provides a procedural macro called `serde_derive` to</span>
<span class='doccomment'>//! automatically generate `Deserialize` implementations for structs and enums</span>
<span class='doccomment'>//! in your program. See the [codegen section of the manual][codegen] for how to</span>
<span class='doccomment'>//! use this.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! In rare cases it may be necessary to implement `Deserialize` manually for</span>
<span class='doccomment'>//! some type in your program. See the [Implementing</span>
<span class='doccomment'>//! `Deserialize`][impl-deserialize] section of the manual for more about this.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Third-party crates may provide `Deserialize` implementations for types that</span>
<span class='doccomment'>//! they expose. For example the `linked-hash-map` crate provides a</span>
<span class='doccomment'>//! `LinkedHashMap<K, V>` type that is deserializable by Serde because the crate</span>
<span class='doccomment'>//! provides an implementation of `Deserialize` for it.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # The Deserializer trait</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! `Deserializer` implementations are provided by third-party crates, for</span>
<span class='doccomment'>//! example [`serde_json`][serde_json], [`serde_yaml`][serde_yaml] and</span>
<span class='doccomment'>//! [`bincode`][bincode].</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! A partial list of well-maintained formats is given on the [Serde</span>
<span class='doccomment'>//! website][data-formats].</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # Implementations of Deserialize provided by Serde</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! This is a slightly different set of types than what is supported for</span>
<span class='doccomment'>//! serialization. Some types can be serialized by Serde but not deserialized.</span>
<span class='doccomment'>//! One example is `&str`.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! - **Primitive types**:</span>
<span class='doccomment'>//! - bool</span>
<span class='doccomment'>//! - isize, i8, i16, i32, i64</span>
<span class='doccomment'>//! - usize, u8, u16, u32, u64</span>
<span class='doccomment'>//! - f32, f64</span>
<span class='doccomment'>//! - char</span>
<span class='doccomment'>//! - **Compound types**:</span>
<span class='doccomment'>//! - [T; 0] through [T; 32]</span>
<span class='doccomment'>//! - tuples up to size 16</span>
<span class='doccomment'>//! - **Common standard library types**:</span>
<span class='doccomment'>//! - String</span>
<span class='doccomment'>//! - Option\<T\></span>
<span class='doccomment'>//! - Result\<T, E\></span>
<span class='doccomment'>//! - PhantomData\<T\></span>
<span class='doccomment'>//! - **Wrapper types**:</span>
<span class='doccomment'>//! - Box\<T\></span>
<span class='doccomment'>//! - Box\<[T]\></span>
<span class='doccomment'>//! - Box\<str\></span>
<span class='doccomment'>//! - Rc\<T\></span>
<span class='doccomment'>//! - Arc\<T\></span>
<span class='doccomment'>//! - Cow\<'a, T\></span>
<span class='doccomment'>//! - **Collection types**:</span>
<span class='doccomment'>//! - BTreeMap\<K, V\></span>
<span class='doccomment'>//! - BTreeSet\<T\></span>
<span class='doccomment'>//! - BinaryHeap\<T\></span>
<span class='doccomment'>//! - HashMap\<K, V, H\></span>
<span class='doccomment'>//! - HashSet\<T, H\></span>
<span class='doccomment'>//! - LinkedList\<T\></span>
<span class='doccomment'>//! - VecDeque\<T\></span>
<span class='doccomment'>//! - Vec\<T\></span>
<span class='doccomment'>//! - EnumSet\<T\> (unstable)</span>
<span class='doccomment'>//! - **Miscellaneous standard library types**:</span>
<span class='doccomment'>//! - Duration</span>
<span class='doccomment'>//! - Path</span>
<span class='doccomment'>//! - PathBuf</span>
<span class='doccomment'>//! - NonZero\<T\> (unstable)</span>
<span class='doccomment'>//! - **Net types**:</span>
<span class='doccomment'>//! - IpAddr</span>
<span class='doccomment'>//! - Ipv4Addr</span>
<span class='doccomment'>//! - Ipv6Addr</span>
<span class='doccomment'>//! - SocketAddr</span>
<span class='doccomment'>//! - SocketAddrV4</span>
<span class='doccomment'>//! - SocketAddrV6</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! [codegen]: https://serde.rs/codegen.html</span>
<span class='doccomment'>//! [impl-deserialize]: https://serde.rs/impl-deserialize.html</span>
<span class='doccomment'>//! [serde_json]: https://github.com/serde-rs/json</span>
<span class='doccomment'>//! [serde_yaml]: https://github.com/dtolnay/serde-yaml</span>
<span class='doccomment'>//! [bincode]: https://github.com/TyOverby/bincode</span>
<span class='doccomment'>//! [data-formats]: https://serde.rs/#data-formats</span>
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"std"</span>)]</span>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>error</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>not</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"std"</span>))]</span>
<span class='kw'>use</span> <span class='ident'>error</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>all</span>(<span class='ident'>not</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"std"</span>), <span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"collections"</span>))]</span>
<span class='kw'>use</span> <span class='ident'>collections</span>::{<span class='ident'>String</span>, <span class='ident'>Vec</span>};
<span class='kw'>use</span> <span class='ident'>core</span>::<span class='ident'>fmt</span>::{<span class='self'>self</span>, <span class='ident'>Display</span>};
<span class='kw'>use</span> <span class='ident'>core</span>::<span class='ident'>marker</span>::<span class='ident'>PhantomData</span>;
<span class='comment'>///////////////////////////////////////////////////////////////////////////////</span>
<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>mod</span> <span class='ident'>impls</span>;
<span class='kw'>pub</span> <span class='kw'>mod</span> <span class='ident'>value</span>;
<span class='kw'>mod</span> <span class='ident'>from_primitive</span>;
<span class='comment'>// Helpers used by generated code. Not public API.</span>
<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>mod</span> <span class='ident'>private</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>any</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"std"</span>, <span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"collections"</span>))]</span>
<span class='kw'>mod</span> <span class='ident'>content</span>;
<span class='comment'>///////////////////////////////////////////////////////////////////////////////</span>
<span class='doccomment'>/// The `Error` trait allows `Deserialize` implementations to create descriptive</span>
<span class='doccomment'>/// error messages belonging to the `Deserializer` against which they are</span>
<span class='doccomment'>/// currently running.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Every `Deserializer` declares an `Error` type that encompasses both</span>
<span class='doccomment'>/// general-purpose deserialization errors as well as errors specific to the</span>
<span class='doccomment'>/// particular deserialization format. For example the `Error` type of</span>
<span class='doccomment'>/// `serde_json` can represent errors like an invalid JSON escape sequence or an</span>
<span class='doccomment'>/// unterminated string literal, in addition to the error cases that are part of</span>
<span class='doccomment'>/// this trait.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Most deserializers should only need to provide the `Error::custom` method</span>
<span class='doccomment'>/// and inherit the default behavior for the other methods.</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>Error</span>: <span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>error</span>::<span class='ident'>Error</span> {
<span class='doccomment'>/// Raised when there is general error when deserializing a type.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The message should not be capitalized and should not end with a period.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust</span>
<span class='doccomment'>/// # use serde::de::{Deserialize, Deserializer, Error};</span>
<span class='doccomment'>/// # use std::str::FromStr;</span>
<span class='doccomment'>/// # #[allow(dead_code)]</span>
<span class='doccomment'>/// # struct IpAddr;</span>
<span class='doccomment'>/// # impl FromStr for IpAddr {</span>
<span class='doccomment'>/// # type Err = String;</span>
<span class='doccomment'>/// # fn from_str(_: &str) -> Result<Self, String> { unimplemented!() }</span>
<span class='doccomment'>/// # }</span>
<span class='doccomment'>/// impl Deserialize for IpAddr {</span>
<span class='doccomment'>/// fn deserialize<D>(deserializer: D) -> Result<Self, D::Error></span>
<span class='doccomment'>/// where D: Deserializer</span>
<span class='doccomment'>/// {</span>
<span class='doccomment'>/// let s = try!(String::deserialize(deserializer));</span>
<span class='doccomment'>/// s.parse().map_err(Error::custom)</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// ```</span>
<span class='kw'>fn</span> <span class='ident'>custom</span><span class='op'><</span><span class='ident'>T</span>: <span class='ident'>Display</span><span class='op'>></span>(<span class='ident'>msg</span>: <span class='ident'>T</span>) <span class='op'>-></span> <span class='self'>Self</span>;
<span class='doccomment'>/// Raised when a `Deserialize` receives a type different from what it was</span>
<span class='doccomment'>/// expecting.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `unexp` argument provides information about what type was received.</span>
<span class='doccomment'>/// This is the type that was present in the input file or other source data</span>
<span class='doccomment'>/// of the Deserializer.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `exp` argument provides information about what type was being</span>
<span class='doccomment'>/// expected. This is the type that is written in the program.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// For example if we try to deserialize a String out of a JSON file</span>
<span class='doccomment'>/// containing an integer, the unexpected type is the integer and the</span>
<span class='doccomment'>/// expected type is the string.</span>
<span class='kw'>fn</span> <span class='ident'>invalid_type</span>(<span class='ident'>unexp</span>: <span class='ident'>Unexpected</span>, <span class='ident'>exp</span>: <span class='kw-2'>&</span><span class='ident'>Expected</span>) <span class='op'>-></span> <span class='self'>Self</span> {
<span class='ident'>Error</span>::<span class='ident'>custom</span>(<span class='macro'>format_args</span><span class='macro'>!</span>(<span class='string'>"invalid type: {}, expected {}"</span>, <span class='ident'>unexp</span>, <span class='ident'>exp</span>))
}
<span class='doccomment'>/// Raised when a `Deserialize` receives a value of the right type but that</span>
<span class='doccomment'>/// is wrong for some other reason.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `unexp` argument provides information about what value was received.</span>
<span class='doccomment'>/// This is the value that was present in the input file or other source</span>
<span class='doccomment'>/// data of the Deserializer.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `exp` argument provides information about what value was being</span>
<span class='doccomment'>/// expected. This is the type that is written in the program.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// For example if we try to deserialize a String out of some binary data</span>
<span class='doccomment'>/// that is not valid UTF-8, the unexpected value is the bytes and the</span>
<span class='doccomment'>/// expected value is a string.</span>
<span class='kw'>fn</span> <span class='ident'>invalid_value</span>(<span class='ident'>unexp</span>: <span class='ident'>Unexpected</span>, <span class='ident'>exp</span>: <span class='kw-2'>&</span><span class='ident'>Expected</span>) <span class='op'>-></span> <span class='self'>Self</span> {
<span class='ident'>Error</span>::<span class='ident'>custom</span>(<span class='macro'>format_args</span><span class='macro'>!</span>(<span class='string'>"invalid value: {}, expected {}"</span>, <span class='ident'>unexp</span>, <span class='ident'>exp</span>))
}
<span class='doccomment'>/// Raised when deserializing a sequence or map and the input data contains</span>
<span class='doccomment'>/// too many or too few elements.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `len` argument is the number of elements encountered. The sequence</span>
<span class='doccomment'>/// or map may have expected more arguments or fewer arguments.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `exp` argument provides information about what data was being</span>
<span class='doccomment'>/// expected. For example `exp` might say that a tuple of size 6 was</span>
<span class='doccomment'>/// expected.</span>
<span class='kw'>fn</span> <span class='ident'>invalid_length</span>(<span class='ident'>len</span>: <span class='ident'>usize</span>, <span class='ident'>exp</span>: <span class='kw-2'>&</span><span class='ident'>Expected</span>) <span class='op'>-></span> <span class='self'>Self</span> {
<span class='ident'>Error</span>::<span class='ident'>custom</span>(<span class='macro'>format_args</span><span class='macro'>!</span>(<span class='string'>"invalid length {}, expected {}"</span>, <span class='ident'>len</span>, <span class='ident'>exp</span>))
}
<span class='doccomment'>/// Raised when a `Deserialize` enum type received a variant with an</span>
<span class='doccomment'>/// unrecognized name.</span>
<span class='kw'>fn</span> <span class='ident'>unknown_variant</span>(<span class='ident'>variant</span>: <span class='kw-2'>&</span><span class='ident'>str</span>, <span class='ident'>expected</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> [<span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>]) <span class='op'>-></span> <span class='self'>Self</span> {
<span class='kw'>if</span> <span class='ident'>expected</span>.<span class='ident'>is_empty</span>() {
<span class='ident'>Error</span>::<span class='ident'>custom</span>(<span class='macro'>format_args</span><span class='macro'>!</span>(<span class='string'>"unknown variant `{}`, there are no variants"</span>,
<span class='ident'>variant</span>))
} <span class='kw'>else</span> {
<span class='ident'>Error</span>::<span class='ident'>custom</span>(<span class='macro'>format_args</span><span class='macro'>!</span>(<span class='string'>"unknown variant `{}`, expected {}"</span>,
<span class='ident'>variant</span>,
<span class='ident'>OneOf</span> { <span class='ident'>names</span>: <span class='ident'>expected</span> }))
}
}
<span class='doccomment'>/// Raised when a `Deserialize` struct type received a field with an</span>
<span class='doccomment'>/// unrecognized name.</span>
<span class='kw'>fn</span> <span class='ident'>unknown_field</span>(<span class='ident'>field</span>: <span class='kw-2'>&</span><span class='ident'>str</span>, <span class='ident'>expected</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> [<span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>]) <span class='op'>-></span> <span class='self'>Self</span> {
<span class='kw'>if</span> <span class='ident'>expected</span>.<span class='ident'>is_empty</span>() {
<span class='ident'>Error</span>::<span class='ident'>custom</span>(<span class='macro'>format_args</span><span class='macro'>!</span>(<span class='string'>"unknown field `{}`, there are no fields"</span>,
<span class='ident'>field</span>))
} <span class='kw'>else</span> {
<span class='ident'>Error</span>::<span class='ident'>custom</span>(<span class='macro'>format_args</span><span class='macro'>!</span>(<span class='string'>"unknown field `{}`, expected {}"</span>,
<span class='ident'>field</span>,
<span class='ident'>OneOf</span> { <span class='ident'>names</span>: <span class='ident'>expected</span> }))
}
}
<span class='doccomment'>/// Raised when a `Deserialize` struct type expected to receive a required</span>
<span class='doccomment'>/// field with a particular name but that field was not present in the</span>
<span class='doccomment'>/// input.</span>
<span class='kw'>fn</span> <span class='ident'>missing_field</span>(<span class='ident'>field</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>) <span class='op'>-></span> <span class='self'>Self</span> {
<span class='ident'>Error</span>::<span class='ident'>custom</span>(<span class='macro'>format_args</span><span class='macro'>!</span>(<span class='string'>"missing field `{}`"</span>, <span class='ident'>field</span>))
}
<span class='doccomment'>/// Raised when a `Deserialize` struct type received more than one of the</span>
<span class='doccomment'>/// same field.</span>
<span class='kw'>fn</span> <span class='ident'>duplicate_field</span>(<span class='ident'>field</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>) <span class='op'>-></span> <span class='self'>Self</span> {
<span class='ident'>Error</span>::<span class='ident'>custom</span>(<span class='macro'>format_args</span><span class='macro'>!</span>(<span class='string'>"duplicate field `{}`"</span>, <span class='ident'>field</span>))
}
}
<span class='doccomment'>/// `Unexpected` represents an unexpected invocation of any one of the `Visitor`</span>
<span class='doccomment'>/// trait methods.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This is used as an argument to the `invalid_type`, `invalid_value`, and</span>
<span class='doccomment'>/// `invalid_length` methods of the `Error` trait to build error messages.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust</span>
<span class='doccomment'>/// # use serde::de::{Error, Unexpected, Visitor};</span>
<span class='doccomment'>/// # use std::fmt;</span>
<span class='doccomment'>/// # #[allow(dead_code)]</span>
<span class='doccomment'>/// # struct Example;</span>
<span class='doccomment'>/// # impl Visitor for Example {</span>
<span class='doccomment'>/// # type Value = ();</span>
<span class='doccomment'>/// fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E></span>
<span class='doccomment'>/// where E: Error</span>
<span class='doccomment'>/// {</span>
<span class='doccomment'>/// Err(Error::invalid_type(Unexpected::Bool(v), &self))</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// # fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class='doccomment'>/// # write!(formatter, "definitely not a boolean")</span>
<span class='doccomment'>/// # }</span>
<span class='doccomment'>/// # }</span>
<span class='doccomment'>/// ```</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Unexpected</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='doccomment'>/// The input contained a boolean value that was not expected.</span>
<span class='ident'>Bool</span>(<span class='ident'>bool</span>),
<span class='doccomment'>/// The input contained an unsigned integer `u8`, `u16`, `u32` or `u64` that</span>
<span class='doccomment'>/// was not expected.</span>
<span class='ident'>Unsigned</span>(<span class='ident'>u64</span>),
<span class='doccomment'>/// The input contained a signed integer `i8`, `i16`, `i32` or `i64` that</span>
<span class='doccomment'>/// was not expected.</span>
<span class='ident'>Signed</span>(<span class='ident'>i64</span>),
<span class='doccomment'>/// The input contained a floating point `f32` or `f64` that was not</span>
<span class='doccomment'>/// expected.</span>
<span class='ident'>Float</span>(<span class='ident'>f64</span>),
<span class='doccomment'>/// The input contained a `char` that was not expected.</span>
<span class='ident'>Char</span>(<span class='ident'>char</span>),
<span class='doccomment'>/// The input contained a `&str` or `String` that was not expected.</span>
<span class='ident'>Str</span>(<span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span>),
<span class='doccomment'>/// The input contained a `&[u8]` or `Vec<u8>` that was not expected.</span>
<span class='ident'>Bytes</span>(<span class='kw-2'>&</span><span class='lifetime'>'a</span> [<span class='ident'>u8</span>]),
<span class='doccomment'>/// The input contained a unit `()` that was not expected.</span>
<span class='ident'>Unit</span>,
<span class='doccomment'>/// The input contained an `Option<T>` that was not expected.</span>
<span class='prelude-ty'>Option</span>,
<span class='doccomment'>/// The input contained a newtype struct that was not expected.</span>
<span class='ident'>NewtypeStruct</span>,
<span class='doccomment'>/// The input contained a sequence that was not expected.</span>
<span class='ident'>Seq</span>,
<span class='doccomment'>/// The input contained a map that was not expected.</span>
<span class='ident'>Map</span>,
<span class='doccomment'>/// The input contained an enum that was not expected.</span>
<span class='ident'>Enum</span>,
<span class='doccomment'>/// The input contained a unit variant that was not expected.</span>
<span class='ident'>UnitVariant</span>,
<span class='doccomment'>/// The input contained a newtype variant that was not expected.</span>
<span class='ident'>NewtypeVariant</span>,
<span class='doccomment'>/// The input contained a tuple variant that was not expected.</span>
<span class='ident'>TupleVariant</span>,
<span class='doccomment'>/// The input contained a struct variant that was not expected.</span>
<span class='ident'>StructVariant</span>,
<span class='doccomment'>/// A message stating what uncategorized thing the input contained that was</span>
<span class='doccomment'>/// not expected.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The message should be a noun or noun phrase, not capitalized and without</span>
<span class='doccomment'>/// a period. An example message is "unoriginal superhero".</span>
<span class='ident'>Other</span>(<span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span>),
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Unexpected</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>formatter</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>fmt</span>::<span class='ident'>Error</span><span class='op'>></span> {
<span class='kw'>use</span> <span class='self'>self</span>::<span class='ident'>Unexpected</span>::<span class='kw-2'>*</span>;
<span class='kw'>match</span> <span class='kw-2'>*</span><span class='self'>self</span> {
<span class='ident'>Bool</span>(<span class='ident'>b</span>) <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"boolean `{}`"</span>, <span class='ident'>b</span>),
<span class='ident'>Unsigned</span>(<span class='ident'>i</span>) <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"integer `{}`"</span>, <span class='ident'>i</span>),
<span class='ident'>Signed</span>(<span class='ident'>i</span>) <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"integer `{}`"</span>, <span class='ident'>i</span>),
<span class='ident'>Float</span>(<span class='ident'>f</span>) <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"floating point `{}`"</span>, <span class='ident'>f</span>),
<span class='ident'>Char</span>(<span class='ident'>c</span>) <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"character `{}`"</span>, <span class='ident'>c</span>),
<span class='ident'>Str</span>(<span class='ident'>s</span>) <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"string {:?}"</span>, <span class='ident'>s</span>),
<span class='ident'>Bytes</span>(_) <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"byte array"</span>),
<span class='ident'>Unit</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"unit value"</span>),
<span class='prelude-ty'>Option</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"Option value"</span>),
<span class='ident'>NewtypeStruct</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"newtype struct"</span>),
<span class='ident'>Seq</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"sequence"</span>),
<span class='ident'>Map</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"map"</span>),
<span class='ident'>Enum</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"enum"</span>),
<span class='ident'>UnitVariant</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"unit variant"</span>),
<span class='ident'>NewtypeVariant</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"newtype variant"</span>),
<span class='ident'>TupleVariant</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"tuple variant"</span>),
<span class='ident'>StructVariant</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"struct variant"</span>),
<span class='ident'>Other</span>(<span class='ident'>other</span>) <span class='op'>=></span> <span class='ident'>formatter</span>.<span class='ident'>write_str</span>(<span class='ident'>other</span>),
}
}
}
<span class='doccomment'>/// `Expected` represents an explanation of what data a `Visitor` was expecting</span>
<span class='doccomment'>/// to receive.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This is used as an argument to the `invalid_type`, `invalid_value`, and</span>
<span class='doccomment'>/// `invalid_length` methods of the `Error` trait to build error messages. The</span>
<span class='doccomment'>/// message should be a noun or noun phrase that completes the sentence "This</span>
<span class='doccomment'>/// Visitor expects to receive ...", for example the message could be "an</span>
<span class='doccomment'>/// integer between 0 and 64". The message should not be capitalized and should</span>
<span class='doccomment'>/// not end with a period.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Within the context of a `Visitor` implementation, the `Visitor` itself</span>
<span class='doccomment'>/// (`&self`) is an implementation of this trait.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust</span>
<span class='doccomment'>/// # use serde::de::{Error, Unexpected, Visitor};</span>
<span class='doccomment'>/// # use std::fmt;</span>
<span class='doccomment'>/// # #[allow(dead_code)]</span>
<span class='doccomment'>/// # struct Example;</span>
<span class='doccomment'>/// # impl Visitor for Example {</span>
<span class='doccomment'>/// # type Value = ();</span>
<span class='doccomment'>/// fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E></span>
<span class='doccomment'>/// where E: Error</span>
<span class='doccomment'>/// {</span>
<span class='doccomment'>/// Err(Error::invalid_type(Unexpected::Bool(v), &self))</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// # fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class='doccomment'>/// # write!(formatter, "definitely not a boolean")</span>
<span class='doccomment'>/// # }</span>
<span class='doccomment'>/// # }</span>
<span class='doccomment'>/// ```</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Outside of a `Visitor`, `&"..."` can be used.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust</span>
<span class='doccomment'>/// # use serde::de::{Error, Unexpected};</span>
<span class='doccomment'>/// # #[allow(dead_code)]</span>
<span class='doccomment'>/// # fn example<E: Error>() -> Result<(), E> {</span>
<span class='doccomment'>/// # let v = true;</span>
<span class='doccomment'>/// return Err(Error::invalid_type(Unexpected::Bool(v), &"a negative integer"));</span>
<span class='doccomment'>/// # }</span>
<span class='doccomment'>/// ```</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>Expected</span> {
<span class='doccomment'>/// Format an explanation of what data was being expected. Same signature as</span>
<span class='doccomment'>/// the `Display` and `Debug` traits.</span>
<span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>formatter</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span>;
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>T</span><span class='op'>></span> <span class='ident'>Expected</span> <span class='kw'>for</span> <span class='ident'>T</span>
<span class='kw'>where</span> <span class='ident'>T</span>: <span class='ident'>Visitor</span>
{
<span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>formatter</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
<span class='self'>self</span>.<span class='ident'>expecting</span>(<span class='ident'>formatter</span>)
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> <span class='ident'>Expected</span> <span class='kw'>for</span> <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span> {
<span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>formatter</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
<span class='ident'>formatter</span>.<span class='ident'>write_str</span>(<span class='self'>self</span>)
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> <span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Expected</span> <span class='op'>+</span> <span class='lifetime'>'a</span> {
<span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>formatter</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
<span class='ident'>Expected</span>::<span class='ident'>fmt</span>(<span class='self'>self</span>, <span class='ident'>formatter</span>)
}
}
<span class='comment'>///////////////////////////////////////////////////////////////////////////////</span>
<span class='doccomment'>/// A **data structure** that can be deserialized from any data format supported</span>
<span class='doccomment'>/// by Serde.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Serde provides `Deserialize` implementations for many Rust primitive and</span>
<span class='doccomment'>/// standard library types. The complete list is [here][de]. All of these can</span>
<span class='doccomment'>/// be deserialized using Serde out of the box.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Additionally, Serde provides a procedural macro called `serde_derive` to</span>
<span class='doccomment'>/// automatically generate `Deserialize` implementations for structs and enums</span>
<span class='doccomment'>/// in your program. See the [codegen section of the manual][codegen] for how to</span>
<span class='doccomment'>/// use this.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// In rare cases it may be necessary to implement `Deserialize` manually for</span>
<span class='doccomment'>/// some type in your program. See the [Implementing</span>
<span class='doccomment'>/// `Deserialize`][impl-deserialize] section of the manual for more about this.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Third-party crates may provide `Deserialize` implementations for types that</span>
<span class='doccomment'>/// they expose. For example the `linked-hash-map` crate provides a</span>
<span class='doccomment'>/// `LinkedHashMap<K, V>` type that is deserializable by Serde because the crate</span>
<span class='doccomment'>/// provides an implementation of `Deserialize` for it.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// [de]: https://docs.serde.rs/serde/de/index.html</span>
<span class='doccomment'>/// [codegen]: https://serde.rs/codegen.html</span>
<span class='doccomment'>/// [impl-deserialize]: https://serde.rs/impl-deserialize.html</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>Deserialize</span>: <span class='ident'>Sized</span> {
<span class='doccomment'>/// Deserialize this value from the given Serde deserializer.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// See the [Implementing `Deserialize`][impl-deserialize] section of the</span>
<span class='doccomment'>/// manual for more information about how to implement this method.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// [impl-deserialize]: https://serde.rs/impl-deserialize.html</span>
<span class='kw'>fn</span> <span class='ident'>deserialize</span><span class='op'><</span><span class='ident'>D</span><span class='op'>></span>(<span class='ident'>deserializer</span>: <span class='ident'>D</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>, <span class='ident'>D</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>D</span>: <span class='ident'>Deserializer</span>;
}
<span class='doccomment'>/// `DeserializeSeed` is the stateful form of the `Deserialize` trait. If you</span>
<span class='doccomment'>/// ever find yourself looking for a way to pass data into a `Deserialize` impl,</span>
<span class='doccomment'>/// this trait is the way to do it.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// As one example of stateful deserialization consider deserializing a JSON</span>
<span class='doccomment'>/// array into an existing buffer. Using the `Deserialize` trait we could</span>
<span class='doccomment'>/// deserialize a JSON array into a `Vec<T>` but it would be a freshly allocated</span>
<span class='doccomment'>/// `Vec<T>`; there is no way for `Deserialize` to reuse a previously allocated</span>
<span class='doccomment'>/// buffer. Using `DeserializeSeed` instead makes this possible as in the</span>
<span class='doccomment'>/// example code below.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The canonical API for stateless deserialization looks like this:</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust</span>
<span class='doccomment'>/// # use serde::Deserialize;</span>
<span class='doccomment'>/// # #[allow(dead_code)]</span>
<span class='doccomment'>/// # enum Error {}</span>
<span class='doccomment'>/// # #[allow(dead_code)]</span>
<span class='doccomment'>/// fn func<T: Deserialize>() -> Result<T, Error></span>
<span class='doccomment'>/// # { unimplemented!() }</span>
<span class='doccomment'>/// ```</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Adjusting an API like this to support stateful deserialization is a matter</span>
<span class='doccomment'>/// of accepting a seed as input:</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust</span>
<span class='doccomment'>/// # use serde::de::DeserializeSeed;</span>
<span class='doccomment'>/// # #[allow(dead_code)]</span>
<span class='doccomment'>/// # enum Error {}</span>
<span class='doccomment'>/// # #[allow(dead_code)]</span>
<span class='doccomment'>/// fn func_seed<T: DeserializeSeed>(seed: T) -> Result<T::Value, Error></span>
<span class='doccomment'>/// # {</span>
<span class='doccomment'>/// # let _ = seed;</span>
<span class='doccomment'>/// # unimplemented!()</span>
<span class='doccomment'>/// # }</span>
<span class='doccomment'>/// ```</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// In practice the majority of deserialization is stateless. An API expecting a</span>
<span class='doccomment'>/// seed can be appeased by passing `std::marker::PhantomData` as a seed in the</span>
<span class='doccomment'>/// case of stateless deserialization.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// # Example</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Suppose we have JSON that looks like `[[1, 2], [3, 4, 5], [6]]` and we need</span>
<span class='doccomment'>/// to deserialize it into a flat representation like `vec![1, 2, 3, 4, 5, 6]`.</span>
<span class='doccomment'>/// Allocating a brand new `Vec<T>` for each subarray would be slow. Instead we</span>
<span class='doccomment'>/// would like to allocate a single `Vec<T>` and then deserialize each subarray</span>
<span class='doccomment'>/// into it. This requires stateful deserialization using the `DeserializeSeed`</span>
<span class='doccomment'>/// trait.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust</span>
<span class='doccomment'>/// # use serde::de::{Deserialize, DeserializeSeed, Deserializer, Visitor, SeqVisitor};</span>
<span class='doccomment'>/// # use std::fmt;</span>
<span class='doccomment'>/// # use std::marker::PhantomData;</span>
<span class='doccomment'>/// #</span>
<span class='doccomment'>/// // A DeserializeSeed implementation that uses stateful deserialization to</span>
<span class='doccomment'>/// // append array elements onto the end of an existing vector. The preexisting</span>
<span class='doccomment'>/// // state ("seed") in this case is the Vec<T>. The `deserialize` method of</span>
<span class='doccomment'>/// // `ExtendVec` will be traversing the inner arrays of the JSON input and</span>
<span class='doccomment'>/// // appending each integer into the existing Vec.</span>
<span class='doccomment'>/// struct ExtendVec<'a, T: 'a>(&'a mut Vec<T>);</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// impl<'a, T> DeserializeSeed for ExtendVec<'a, T></span>
<span class='doccomment'>/// where T: Deserialize</span>
<span class='doccomment'>/// {</span>
<span class='doccomment'>/// // The return type of the `deserialize` method. This implementation</span>
<span class='doccomment'>/// // appends onto an existing vector but does not create any new data</span>
<span class='doccomment'>/// // structure, so the return type is ().</span>
<span class='doccomment'>/// type Value = ();</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error></span>
<span class='doccomment'>/// where D: Deserializer</span>
<span class='doccomment'>/// {</span>
<span class='doccomment'>/// // Visitor implementation that will walk an inner array of the JSON</span>
<span class='doccomment'>/// // input.</span>
<span class='doccomment'>/// struct ExtendVecVisitor<'a, T: 'a>(&'a mut Vec<T>);</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// impl<'a, T> Visitor for ExtendVecVisitor<'a, T></span>
<span class='doccomment'>/// where T: Deserialize</span>
<span class='doccomment'>/// {</span>
<span class='doccomment'>/// type Value = ();</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// fn visit_seq<V>(self, mut visitor: V) -> Result<(), V::Error></span>
<span class='doccomment'>/// where V: SeqVisitor</span>
<span class='doccomment'>/// {</span>
<span class='doccomment'>/// // Visit each element in the inner array and push it onto</span>
<span class='doccomment'>/// // the existing vector.</span>
<span class='doccomment'>/// while let Some(elem) = visitor.visit()? {</span>
<span class='doccomment'>/// self.0.push(elem);</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// Ok(())</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// #</span>
<span class='doccomment'>/// # fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class='doccomment'>/// # write!(formatter, "an array of integers")</span>
<span class='doccomment'>/// # }</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// deserializer.deserialize_seq(ExtendVecVisitor(self.0))</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// // Visitor implementation that will walk the outer array of the JSON input.</span>
<span class='doccomment'>/// struct FlattenedVecVisitor<T>(PhantomData<T>);</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// impl<T> Visitor for FlattenedVecVisitor<T></span>
<span class='doccomment'>/// where T: Deserialize</span>
<span class='doccomment'>/// {</span>
<span class='doccomment'>/// // This Visitor constructs a single Vec<T> to hold the flattened</span>
<span class='doccomment'>/// // contents of the inner arrays.</span>
<span class='doccomment'>/// type Value = Vec<T>;</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// fn visit_seq<V>(self, mut visitor: V) -> Result<Vec<T>, V::Error></span>
<span class='doccomment'>/// where V: SeqVisitor</span>
<span class='doccomment'>/// {</span>
<span class='doccomment'>/// // Create a single Vec to hold the flattened contents.</span>
<span class='doccomment'>/// let mut vec = Vec::new();</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// // Each iteration through this loop is one inner array.</span>
<span class='doccomment'>/// while let Some(()) = visitor.visit_seed(ExtendVec(&mut vec))? {</span>
<span class='doccomment'>/// // Nothing to do; inner array has been appended into `vec`.</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// // Return the finished vec.</span>
<span class='doccomment'>/// Ok(vec)</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// #</span>
<span class='doccomment'>/// # fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class='doccomment'>/// # write!(formatter, "an array of arrays")</span>
<span class='doccomment'>/// # }</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// # #[allow(dead_code)]</span>
<span class='doccomment'>/// # fn example<D: Deserializer>(deserializer: D) -> Result<(), D::Error> {</span>
<span class='doccomment'>/// let visitor = FlattenedVecVisitor(PhantomData);</span>
<span class='doccomment'>/// let flattened: Vec<u64> = deserializer.deserialize_seq(visitor)?;</span>
<span class='doccomment'>/// # let _ = flattened;</span>
<span class='doccomment'>/// # Ok(()) }</span>
<span class='doccomment'>/// ```</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>DeserializeSeed</span>: <span class='ident'>Sized</span> {
<span class='doccomment'>/// The type produced by using this seed.</span>
<span class='kw'>type</span> <span class='ident'>Value</span>;
<span class='doccomment'>/// Equivalent to the more common `Deserialize::deserialize` method, except</span>
<span class='doccomment'>/// with some initial piece of data (the seed) passed in.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize</span><span class='op'><</span><span class='ident'>D</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>deserializer</span>: <span class='ident'>D</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>D</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>D</span>: <span class='ident'>Deserializer</span>;
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>T</span><span class='op'>></span> <span class='ident'>DeserializeSeed</span> <span class='kw'>for</span> <span class='ident'>PhantomData</span><span class='op'><</span><span class='ident'>T</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>T</span>: <span class='ident'>Deserialize</span>
{
<span class='kw'>type</span> <span class='ident'>Value</span> <span class='op'>=</span> <span class='ident'>T</span>;
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>deserialize</span><span class='op'><</span><span class='ident'>D</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>deserializer</span>: <span class='ident'>D</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>T</span>, <span class='ident'>D</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>D</span>: <span class='ident'>Deserializer</span>
{
<span class='ident'>T</span>::<span class='ident'>deserialize</span>(<span class='ident'>deserializer</span>)
}
}
<span class='comment'>///////////////////////////////////////////////////////////////////////////////</span>
<span class='doccomment'>/// A **data format** that can deserialize any data structure supported by</span>
<span class='doccomment'>/// Serde.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The role of this trait is to define the deserialization half of the Serde</span>
<span class='doccomment'>/// data model, which is a way to categorize every Rust data type into one of 28</span>
<span class='doccomment'>/// possible types. Each method of the `Serializer` trait corresponds to one of</span>
<span class='doccomment'>/// the types of the data model.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Implementations of `Deserialize` map themselves into this data model by</span>
<span class='doccomment'>/// passing to the `Deserializer` a `Visitor` implementation that can receive</span>
<span class='doccomment'>/// these various types.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The types that make up the Serde data model are:</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// - 12 primitive types:</span>
<span class='doccomment'>/// - bool</span>
<span class='doccomment'>/// - i8, i16, i32, i64</span>
<span class='doccomment'>/// - u8, u16, u32, u64</span>
<span class='doccomment'>/// - f32, f64</span>
<span class='doccomment'>/// - char</span>
<span class='doccomment'>/// - string</span>
<span class='doccomment'>/// - byte array - [u8]</span>
<span class='doccomment'>/// - option</span>
<span class='doccomment'>/// - either none or some value</span>
<span class='doccomment'>/// - unit</span>
<span class='doccomment'>/// - unit is the type of () in Rust</span>
<span class='doccomment'>/// - unit_struct</span>
<span class='doccomment'>/// - for example `struct Unit` or `PhantomData<T>`</span>
<span class='doccomment'>/// - unit_variant</span>
<span class='doccomment'>/// - the `E::A` and `E::B` in `enum E { A, B }`</span>
<span class='doccomment'>/// - newtype_struct</span>
<span class='doccomment'>/// - for example `struct Millimeters(u8)`</span>
<span class='doccomment'>/// - newtype_variant</span>
<span class='doccomment'>/// - the `E::N` in `enum E { N(u8) }`</span>
<span class='doccomment'>/// - seq</span>
<span class='doccomment'>/// - a dynamically sized sequence of values, for example `Vec<T>` or</span>
<span class='doccomment'>/// `HashSet<T>`</span>
<span class='doccomment'>/// - seq_fixed_size</span>
<span class='doccomment'>/// - a statically sized sequence of values for which the size will be known</span>
<span class='doccomment'>/// at deserialization time without looking at the serialized data, for</span>
<span class='doccomment'>/// example `[u64; 10]`</span>
<span class='doccomment'>/// - tuple</span>
<span class='doccomment'>/// - for example `(u8,)` or `(String, u64, Vec<T>)`</span>
<span class='doccomment'>/// - tuple_struct</span>
<span class='doccomment'>/// - for example `struct Rgb(u8, u8, u8)`</span>
<span class='doccomment'>/// - tuple_variant</span>
<span class='doccomment'>/// - the `E::T` in `enum E { T(u8, u8) }`</span>
<span class='doccomment'>/// - map</span>
<span class='doccomment'>/// - for example `BTreeMap<K, V>`</span>
<span class='doccomment'>/// - struct</span>
<span class='doccomment'>/// - a key-value pairing in which the keys will be known at deserialization</span>
<span class='doccomment'>/// time without looking at the serialized data, for example `struct S { r:</span>
<span class='doccomment'>/// u8, g: u8, b: u8 }`</span>
<span class='doccomment'>/// - struct_variant</span>
<span class='doccomment'>/// - the `E::S` in `enum E { S { r: u8, g: u8, b: u8 } }`</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `Deserializer` trait supports two entry point styles which enables</span>
<span class='doccomment'>/// different kinds of deserialization.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// 1. The `deserialize` method. Self-describing data formats like JSON are able</span>
<span class='doccomment'>/// to look at the serialized data and tell what it represents. For example</span>
<span class='doccomment'>/// the JSON deserializer may see an opening curly brace (`{`) and know that</span>
<span class='doccomment'>/// it is seeing a map. If the data format supports</span>
<span class='doccomment'>/// `Deserializer::deserialize`, it will drive the Visitor using whatever</span>
<span class='doccomment'>/// type it sees in the input. JSON uses this approach when deserializing</span>
<span class='doccomment'>/// `serde_json::Value` which is an enum that can represent any JSON</span>
<span class='doccomment'>/// document. Without knowing what is in a JSON document, we can deserialize</span>
<span class='doccomment'>/// it to `serde_json::Value` by going through `Deserializer::deserialize`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// 2. The various `deserialize_*` methods. Non-self-describing formats like</span>
<span class='doccomment'>/// Bincode need to be told what is in the input in order to deserialize it.</span>
<span class='doccomment'>/// The `deserialize_*` methods are hints to the deserializer for how to</span>
<span class='doccomment'>/// interpret the next piece of input. Non-self-describing formats are not</span>
<span class='doccomment'>/// able to deserialize something like `serde_json::Value` which relies on</span>
<span class='doccomment'>/// `Deserializer::deserialize`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// When implementing `Deserialize`, you should avoid relying on</span>
<span class='doccomment'>/// `Deserializer::deserialize` unless you need to be told by the Deserializer</span>
<span class='doccomment'>/// what type is in the input. Know that relying on `Deserializer::deserialize`</span>
<span class='doccomment'>/// means your data type will be able to deserialize from self-describing</span>
<span class='doccomment'>/// formats only, ruling out Bincode and many others.</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>Deserializer</span>: <span class='ident'>Sized</span> {
<span class='doccomment'>/// The error type that can be returned if some error occurs during</span>
<span class='doccomment'>/// deserialization.</span>
<span class='kw'>type</span> <span class='ident'>Error</span>: <span class='ident'>Error</span>;
<span class='doccomment'>/// Require the `Deserializer` to figure out how to drive the visitor based</span>
<span class='doccomment'>/// on what data type is in the input.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// When implementing `Deserialize`, you should avoid relying on</span>
<span class='doccomment'>/// `Deserializer::deserialize` unless you need to be told by the</span>
<span class='doccomment'>/// Deserializer what type is in the input. Know that relying on</span>
<span class='doccomment'>/// `Deserializer::deserialize` means your data type will be able to</span>
<span class='doccomment'>/// deserialize from self-describing formats only, ruling out Bincode and</span>
<span class='doccomment'>/// many others.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a `bool` value.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_bool</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a `u8` value.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_u8</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a `u16` value.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_u16</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a `u32` value.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_u32</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a `u64` value.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_u64</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting an `i8` value.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_i8</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting an `i16` value.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_i16</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting an `i32` value.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_i32</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting an `i64` value.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_i64</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a `f32` value.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_f32</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a `f64` value.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_f64</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a `char` value.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_char</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a string value and does</span>
<span class='doccomment'>/// not benefit from taking ownership of buffered data owned by the</span>
<span class='doccomment'>/// `Deserializer`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// If the `Visitor` would benefit from taking ownership of `String` data,</span>
<span class='doccomment'>/// indiciate this to the `Deserializer` by using `deserialize_string`</span>
<span class='doccomment'>/// instead.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_str</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a string value and would</span>
<span class='doccomment'>/// benefit from taking ownership of buffered data owned by the</span>
<span class='doccomment'>/// `Deserializer`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// If the `Visitor` would not benefit from taking ownership of `String`</span>
<span class='doccomment'>/// data, indicate that to the `Deserializer` by using `deserialize_str`</span>
<span class='doccomment'>/// instead.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_string</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a byte array and does not</span>
<span class='doccomment'>/// benefit from taking ownership of buffered data owned by the</span>
<span class='doccomment'>/// `Deserializer`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// If the `Visitor` would benefit from taking ownership of `Vec<u8>` data,</span>
<span class='doccomment'>/// indicate this to the `Deserializer` by using `deserialize_byte_buf`</span>
<span class='doccomment'>/// instead.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_bytes</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a byte array and would</span>
<span class='doccomment'>/// benefit from taking ownership of buffered data owned by the</span>
<span class='doccomment'>/// `Deserializer`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// If the `Visitor` would not benefit from taking ownership of `Vec<u8>`</span>
<span class='doccomment'>/// data, indicate that to the `Deserializer` by using `deserialize_bytes`</span>
<span class='doccomment'>/// instead.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_byte_buf</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting an optional value.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This allows deserializers that encode an optional value as a nullable</span>
<span class='doccomment'>/// value to convert the null value into `None` and a regular value into</span>
<span class='doccomment'>/// `Some(value)`.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_option</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a unit value.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_unit</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a unit struct with a</span>
<span class='doccomment'>/// particular name.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_unit_struct</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>,
<span class='ident'>name</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>,
<span class='ident'>visitor</span>: <span class='ident'>V</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a newtype struct with a</span>
<span class='doccomment'>/// particular name.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_newtype_struct</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>,
<span class='ident'>name</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>,
<span class='ident'>visitor</span>: <span class='ident'>V</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a sequence of values.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_seq</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a sequence of values and</span>
<span class='doccomment'>/// knows how many values there are without looking at the serialized data.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_seq_fixed_size</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>,
<span class='ident'>len</span>: <span class='ident'>usize</span>,
<span class='ident'>visitor</span>: <span class='ident'>V</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a tuple value with a</span>
<span class='doccomment'>/// particular number of elements.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_tuple</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>len</span>: <span class='ident'>usize</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a tuple struct with a</span>
<span class='doccomment'>/// particular name and number of fields.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_tuple_struct</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>,
<span class='ident'>name</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>,
<span class='ident'>len</span>: <span class='ident'>usize</span>,
<span class='ident'>visitor</span>: <span class='ident'>V</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a map of key-value pairs.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_map</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span> <span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting a struct with a particular</span>
<span class='doccomment'>/// name and fields.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_struct</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>,
<span class='ident'>name</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>,
<span class='ident'>fields</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> [<span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>],
<span class='ident'>visitor</span>: <span class='ident'>V</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting the name of a struct</span>
<span class='doccomment'>/// field.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_struct_field</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type is expecting an enum value with a</span>
<span class='doccomment'>/// particular name and possible variants.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_enum</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>,
<span class='ident'>name</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>,
<span class='ident'>variants</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> [<span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>],
<span class='ident'>visitor</span>: <span class='ident'>V</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Hint that the `Deserialize` type needs to deserialize a value whose type</span>
<span class='doccomment'>/// doesn't matter because it is ignored.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Deserializers for non-self-describing formats may not support this mode.</span>
<span class='kw'>fn</span> <span class='ident'>deserialize_ignored_any</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
}
<span class='comment'>///////////////////////////////////////////////////////////////////////////////</span>
<span class='doccomment'>/// This trait represents a visitor that walks through a deserializer.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust</span>
<span class='doccomment'>/// # use serde::de::{Error, Unexpected, Visitor};</span>
<span class='doccomment'>/// # use std::fmt;</span>
<span class='doccomment'>/// /// A visitor that deserializes a long string - a string containing at least</span>
<span class='doccomment'>/// /// some minimum number of bytes.</span>
<span class='doccomment'>/// # #[allow(dead_code)]</span>
<span class='doccomment'>/// struct LongString {</span>
<span class='doccomment'>/// min: usize,</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// impl Visitor for LongString {</span>
<span class='doccomment'>/// type Value = String;</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class='doccomment'>/// write!(formatter, "a string containing at least {} bytes", self.min)</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// fn visit_str<E>(self, s: &str) -> Result<Self::Value, E></span>
<span class='doccomment'>/// where E: Error</span>
<span class='doccomment'>/// {</span>
<span class='doccomment'>/// if s.len() >= self.min {</span>
<span class='doccomment'>/// Ok(s.to_owned())</span>
<span class='doccomment'>/// } else {</span>
<span class='doccomment'>/// Err(Error::invalid_value(Unexpected::Str(s), &self))</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// ```</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>Visitor</span>: <span class='ident'>Sized</span> {
<span class='doccomment'>/// The value produced by this visitor.</span>
<span class='kw'>type</span> <span class='ident'>Value</span>;
<span class='doccomment'>/// Format a message stating what data this Visitor expects to receive.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This is used in error messages. The message should complete the sentence</span>
<span class='doccomment'>/// "This Visitor expects to receive ...", for example the message could be</span>
<span class='doccomment'>/// "an integer between 0 and 64". The message should not be capitalized and</span>
<span class='doccomment'>/// should not end with a period.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust</span>
<span class='doccomment'>/// # use std::fmt;</span>
<span class='doccomment'>/// # #[allow(dead_code)]</span>
<span class='doccomment'>/// # struct S { max: usize }</span>
<span class='doccomment'>/// # impl serde::de::Visitor for S {</span>
<span class='doccomment'>/// # type Value = ();</span>
<span class='doccomment'>/// fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class='doccomment'>/// write!(formatter, "an integer between 0 and {}", self.max)</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// # }</span>
<span class='doccomment'>/// ```</span>
<span class='kw'>fn</span> <span class='ident'>expecting</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>formatter</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span>;
<span class='doccomment'>/// Deserialize a `bool` into a `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_bool</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>bool</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>invalid_type</span>(<span class='ident'>Unexpected</span>::<span class='ident'>Bool</span>(<span class='ident'>v</span>), <span class='kw-2'>&</span><span class='self'>self</span>))
}
<span class='doccomment'>/// Deserialize an `i8` into a `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_i8</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>i8</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='self'>self</span>.<span class='ident'>visit_i64</span>(<span class='ident'>v</span> <span class='kw'>as</span> <span class='ident'>i64</span>)
}
<span class='doccomment'>/// Deserialize an `i16` into a `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_i16</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>i16</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='self'>self</span>.<span class='ident'>visit_i64</span>(<span class='ident'>v</span> <span class='kw'>as</span> <span class='ident'>i64</span>)
}
<span class='doccomment'>/// Deserialize an `i32` into a `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_i32</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>i32</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='self'>self</span>.<span class='ident'>visit_i64</span>(<span class='ident'>v</span> <span class='kw'>as</span> <span class='ident'>i64</span>)
}
<span class='doccomment'>/// Deserialize an `i64` into a `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_i64</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>i64</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>invalid_type</span>(<span class='ident'>Unexpected</span>::<span class='ident'>Signed</span>(<span class='ident'>v</span>), <span class='kw-2'>&</span><span class='self'>self</span>))
}
<span class='doccomment'>/// Deserialize a `u8` into a `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_u8</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>u8</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='self'>self</span>.<span class='ident'>visit_u64</span>(<span class='ident'>v</span> <span class='kw'>as</span> <span class='ident'>u64</span>)
}
<span class='doccomment'>/// Deserialize a `u16` into a `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_u16</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>u16</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='self'>self</span>.<span class='ident'>visit_u64</span>(<span class='ident'>v</span> <span class='kw'>as</span> <span class='ident'>u64</span>)
}
<span class='doccomment'>/// Deserialize a `u32` into a `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_u32</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>u32</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='self'>self</span>.<span class='ident'>visit_u64</span>(<span class='ident'>v</span> <span class='kw'>as</span> <span class='ident'>u64</span>)
}
<span class='doccomment'>/// Deserialize a `u64` into a `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_u64</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>u64</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>invalid_type</span>(<span class='ident'>Unexpected</span>::<span class='ident'>Unsigned</span>(<span class='ident'>v</span>), <span class='kw-2'>&</span><span class='self'>self</span>))
}
<span class='doccomment'>/// Deserialize a `f32` into a `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_f32</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>f32</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='self'>self</span>.<span class='ident'>visit_f64</span>(<span class='ident'>v</span> <span class='kw'>as</span> <span class='ident'>f64</span>)
}
<span class='doccomment'>/// Deserialize a `f64` into a `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_f64</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>f64</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>invalid_type</span>(<span class='ident'>Unexpected</span>::<span class='ident'>Float</span>(<span class='ident'>v</span>), <span class='kw-2'>&</span><span class='self'>self</span>))
}
<span class='doccomment'>/// Deserialize a `char` into a `Value`.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit_char</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>char</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='self'>self</span>.<span class='ident'>visit_str</span>(::<span class='ident'>utils</span>::<span class='ident'>encode_utf8</span>(<span class='ident'>v</span>).<span class='ident'>as_str</span>())
}
<span class='doccomment'>/// Deserialize a `&str` into a `Value`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This method allows the `Deserializer` to avoid a copy by retaining</span>
<span class='doccomment'>/// ownership of any buffered data. `Deserialize` implementations that do</span>
<span class='doccomment'>/// not benefit from taking ownership of `String` data should indicate that</span>
<span class='doccomment'>/// to the deserializer by using `Deserializer::deserialize_str` rather than</span>
<span class='doccomment'>/// `Deserializer::deserialize_string`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// It is never correct to implement `visit_string` without implementing</span>
<span class='doccomment'>/// `visit_str`. Implement neither, both, or just `visit_str`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_str</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='kw-2'>&</span><span class='ident'>str</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>invalid_type</span>(<span class='ident'>Unexpected</span>::<span class='ident'>Str</span>(<span class='ident'>v</span>), <span class='kw-2'>&</span><span class='self'>self</span>))
}
<span class='doccomment'>/// Deserialize a `String` into a `Value`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This method allows the `Visitor` to avoid a copy by taking ownership of</span>
<span class='doccomment'>/// a string created by the `Deserializer`. `Deserialize` implementations</span>
<span class='doccomment'>/// that benefit from taking ownership of `String` data should indicate that</span>
<span class='doccomment'>/// to the deserializer by using `Deserializer::deserialize_string` rather</span>
<span class='doccomment'>/// than `Deserializer::deserialize_str`, although not every deserializer</span>
<span class='doccomment'>/// will honor such a request.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// It is never correct to implement `visit_string` without implementing</span>
<span class='doccomment'>/// `visit_str`. Implement neither, both, or just `visit_str`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The default implementation forwards to `visit_str` and then drops the</span>
<span class='doccomment'>/// `String`.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>any</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"std"</span>, <span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"collections"</span>))]</span>
<span class='kw'>fn</span> <span class='ident'>visit_string</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>String</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='self'>self</span>.<span class='ident'>visit_str</span>(<span class='kw-2'>&</span><span class='ident'>v</span>)
}
<span class='doccomment'>/// Deserialize a `()` into a `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_unit</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>invalid_type</span>(<span class='ident'>Unexpected</span>::<span class='ident'>Unit</span>, <span class='kw-2'>&</span><span class='self'>self</span>))
}
<span class='doccomment'>/// Deserialize an absent optional `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_none</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>invalid_type</span>(<span class='ident'>Unexpected</span>::<span class='prelude-ty'>Option</span>, <span class='kw-2'>&</span><span class='self'>self</span>))
}
<span class='doccomment'>/// Deserialize a present optional `Value`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_some</span><span class='op'><</span><span class='ident'>D</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>deserializer</span>: <span class='ident'>D</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>D</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>D</span>: <span class='ident'>Deserializer</span>
{
<span class='kw'>let</span> _ <span class='op'>=</span> <span class='ident'>deserializer</span>;
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>invalid_type</span>(<span class='ident'>Unexpected</span>::<span class='prelude-ty'>Option</span>, <span class='kw-2'>&</span><span class='self'>self</span>))
}
<span class='doccomment'>/// Deserialize `Value` as a newtype struct.</span>
<span class='kw'>fn</span> <span class='ident'>visit_newtype_struct</span><span class='op'><</span><span class='ident'>D</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>deserializer</span>: <span class='ident'>D</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>D</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>D</span>: <span class='ident'>Deserializer</span>
{
<span class='kw'>let</span> _ <span class='op'>=</span> <span class='ident'>deserializer</span>;
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>invalid_type</span>(<span class='ident'>Unexpected</span>::<span class='ident'>NewtypeStruct</span>, <span class='kw-2'>&</span><span class='self'>self</span>))
}
<span class='doccomment'>/// Deserialize `Value` as a sequence of elements.</span>
<span class='kw'>fn</span> <span class='ident'>visit_seq</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>V</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>SeqVisitor</span>
{
<span class='kw'>let</span> _ <span class='op'>=</span> <span class='ident'>visitor</span>;
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>invalid_type</span>(<span class='ident'>Unexpected</span>::<span class='ident'>Seq</span>, <span class='kw-2'>&</span><span class='self'>self</span>))
}
<span class='doccomment'>/// Deserialize `Value` as a key-value map.</span>
<span class='kw'>fn</span> <span class='ident'>visit_map</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>V</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>MapVisitor</span>
{
<span class='kw'>let</span> _ <span class='op'>=</span> <span class='ident'>visitor</span>;
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>invalid_type</span>(<span class='ident'>Unexpected</span>::<span class='ident'>Map</span>, <span class='kw-2'>&</span><span class='self'>self</span>))
}
<span class='doccomment'>/// Deserialize `Value` as an enum.</span>
<span class='kw'>fn</span> <span class='ident'>visit_enum</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>V</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>EnumVisitor</span>
{
<span class='kw'>let</span> _ <span class='op'>=</span> <span class='ident'>visitor</span>;
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>invalid_type</span>(<span class='ident'>Unexpected</span>::<span class='ident'>Enum</span>, <span class='kw-2'>&</span><span class='self'>self</span>))
}
<span class='doccomment'>/// Deserialize a `&[u8]` into a `Value`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This method allows the `Deserializer` to avoid a copy by retaining</span>
<span class='doccomment'>/// ownership of any buffered data. `Deserialize` implementations that do</span>
<span class='doccomment'>/// not benefit from taking ownership of `Vec<u8>` data should indicate that</span>
<span class='doccomment'>/// to the deserializer by using `Deserializer::deserialize_bytes` rather</span>
<span class='doccomment'>/// than `Deserializer::deserialize_byte_buf`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// It is never correct to implement `visit_byte_buf` without implementing</span>
<span class='doccomment'>/// `visit_bytes`. Implement neither, both, or just `visit_bytes`.</span>
<span class='kw'>fn</span> <span class='ident'>visit_bytes</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>]) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='kw'>let</span> _ <span class='op'>=</span> <span class='ident'>v</span>;
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>invalid_type</span>(<span class='ident'>Unexpected</span>::<span class='ident'>Bytes</span>(<span class='ident'>v</span>), <span class='kw-2'>&</span><span class='self'>self</span>))
}
<span class='doccomment'>/// Deserialize a `Vec<u8>` into a `Value`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This method allows the `Visitor` to avoid a copy by taking ownership of</span>
<span class='doccomment'>/// a byte buffer created by the `Deserializer`. `Deserialize`</span>
<span class='doccomment'>/// implementations that benefit from taking ownership of `Vec<u8>` data</span>
<span class='doccomment'>/// should indicate that to the deserializer by using</span>
<span class='doccomment'>/// `Deserializer::deserialize_byte_buf` rather than</span>
<span class='doccomment'>/// `Deserializer::deserialize_bytes`, although not every deserializer will</span>
<span class='doccomment'>/// honor such a request.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// It is never correct to implement `visit_byte_buf` without implementing</span>
<span class='doccomment'>/// `visit_bytes`. Implement neither, both, or just `visit_bytes`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The default implementation forwards to `visit_bytes` and then drops the</span>
<span class='doccomment'>/// `Vec<u8>`.</span>
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>any</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"std"</span>, <span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"collections"</span>))]</span>
<span class='kw'>fn</span> <span class='ident'>visit_byte_buf</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='self'>Self</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='self'>self</span>.<span class='ident'>visit_bytes</span>(<span class='kw-2'>&</span><span class='ident'>v</span>)
}
}
<span class='comment'>///////////////////////////////////////////////////////////////////////////////</span>
<span class='doccomment'>/// `SeqVisitor` visits each item in a sequence.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This is a trait that a `Deserializer` passes to a `Visitor` implementation,</span>
<span class='doccomment'>/// which deserializes each item in a sequence.</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>SeqVisitor</span> {
<span class='doccomment'>/// The error type that can be returned if some error occurs during</span>
<span class='doccomment'>/// deserialization.</span>
<span class='kw'>type</span> <span class='ident'>Error</span>: <span class='ident'>Error</span>;
<span class='doccomment'>/// This returns `Ok(Some(value))` for the next value in the sequence, or</span>
<span class='doccomment'>/// `Ok(None)` if there are no more remaining items.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `Deserialize` implementations should typically use `SeqVisitor::visit`</span>
<span class='doccomment'>/// instead.</span>
<span class='kw'>fn</span> <span class='ident'>visit_seed</span><span class='op'><</span><span class='ident'>T</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>seed</span>: <span class='ident'>T</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>T</span>::<span class='ident'>Value</span><span class='op'>></span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>T</span>: <span class='ident'>DeserializeSeed</span>;
<span class='doccomment'>/// This returns `Ok(Some(value))` for the next value in the sequence, or</span>
<span class='doccomment'>/// `Ok(None)` if there are no more remaining items.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This method exists as a convenience for `Deserialize` implementations.</span>
<span class='doccomment'>/// `SeqVisitor` implementations should not override the default behavior.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit</span><span class='op'><</span><span class='ident'>T</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>T</span><span class='op'>></span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>T</span>: <span class='ident'>Deserialize</span>
{
<span class='self'>self</span>.<span class='ident'>visit_seed</span>(<span class='ident'>PhantomData</span>)
}
<span class='doccomment'>/// Return the lower and upper bound of items remaining in the sequence.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>size_hint</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> (<span class='ident'>usize</span>, <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>usize</span><span class='op'>></span>) {
(<span class='number'>0</span>, <span class='prelude-val'>None</span>)
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>V</span><span class='op'>></span> <span class='ident'>SeqVisitor</span> <span class='kw'>for</span> <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='kw-2'>mut</span> <span class='ident'>V</span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>SeqVisitor</span>
{
<span class='kw'>type</span> <span class='ident'>Error</span> <span class='op'>=</span> <span class='ident'>V</span>::<span class='ident'>Error</span>;
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit_seed</span><span class='op'><</span><span class='ident'>T</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>seed</span>: <span class='ident'>T</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>T</span>::<span class='ident'>Value</span><span class='op'>></span>, <span class='ident'>V</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>T</span>: <span class='ident'>DeserializeSeed</span>
{
(<span class='kw-2'>*</span><span class='kw-2'>*</span><span class='self'>self</span>).<span class='ident'>visit_seed</span>(<span class='ident'>seed</span>)
}
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit</span><span class='op'><</span><span class='ident'>T</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>T</span><span class='op'>></span>, <span class='ident'>V</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>T</span>: <span class='ident'>Deserialize</span>
{
(<span class='kw-2'>*</span><span class='kw-2'>*</span><span class='self'>self</span>).<span class='ident'>visit</span>()
}
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>size_hint</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> (<span class='ident'>usize</span>, <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>usize</span><span class='op'>></span>) {
(<span class='kw-2'>*</span><span class='kw-2'>*</span><span class='self'>self</span>).<span class='ident'>size_hint</span>()
}
}
<span class='comment'>///////////////////////////////////////////////////////////////////////////////</span>
<span class='doccomment'>/// `MapVisitor` visits each item in a sequence.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This is a trait that a `Deserializer` passes to a `Visitor` implementation.</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>MapVisitor</span> {
<span class='doccomment'>/// The error type that can be returned if some error occurs during</span>
<span class='doccomment'>/// deserialization.</span>
<span class='kw'>type</span> <span class='ident'>Error</span>: <span class='ident'>Error</span>;
<span class='doccomment'>/// This returns `Ok(Some(key))` for the next key in the map, or `Ok(None)`</span>
<span class='doccomment'>/// if there are no more remaining entries.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `Deserialize` implementations should typically use</span>
<span class='doccomment'>/// `MapVisitor::visit_key` or `MapVisitor::visit` instead.</span>
<span class='kw'>fn</span> <span class='ident'>visit_key_seed</span><span class='op'><</span><span class='ident'>K</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>seed</span>: <span class='ident'>K</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>K</span>::<span class='ident'>Value</span><span class='op'>></span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>K</span>: <span class='ident'>DeserializeSeed</span>;
<span class='doccomment'>/// This returns a `Ok(value)` for the next value in the map.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `Deserialize` implementations should typically use</span>
<span class='doccomment'>/// `MapVisitor::visit_value` instead.</span>
<span class='kw'>fn</span> <span class='ident'>visit_value_seed</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>seed</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>DeserializeSeed</span>;
<span class='doccomment'>/// This returns `Ok(Some((key, value)))` for the next (key-value) pair in</span>
<span class='doccomment'>/// the map, or `Ok(None)` if there are no more remaining items.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `MapVisitor` implementations should override the default behavior if a</span>
<span class='doccomment'>/// more efficient implementation is possible.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `Deserialize` implementations should typically use `MapVisitor::visit`</span>
<span class='doccomment'>/// instead.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit_seed</span><span class='op'><</span><span class='ident'>K</span>, <span class='ident'>V</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>,
<span class='ident'>kseed</span>: <span class='ident'>K</span>,
<span class='ident'>vseed</span>: <span class='ident'>V</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span>(<span class='ident'>K</span>::<span class='ident'>Value</span>, <span class='ident'>V</span>::<span class='ident'>Value</span>)<span class='op'>></span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>K</span>: <span class='ident'>DeserializeSeed</span>,
<span class='ident'>V</span>: <span class='ident'>DeserializeSeed</span>
{
<span class='kw'>match</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>visit_key_seed</span>(<span class='ident'>kseed</span>)) {
<span class='prelude-val'>Some</span>(<span class='ident'>key</span>) <span class='op'>=></span> {
<span class='kw'>let</span> <span class='ident'>value</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>visit_value_seed</span>(<span class='ident'>vseed</span>));
<span class='prelude-val'>Ok</span>(<span class='prelude-val'>Some</span>((<span class='ident'>key</span>, <span class='ident'>value</span>)))
}
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='prelude-val'>Ok</span>(<span class='prelude-val'>None</span>),
}
}
<span class='doccomment'>/// This returns `Ok(Some(key))` for the next key in the map, or `Ok(None)`</span>
<span class='doccomment'>/// if there are no more remaining entries.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This method exists as a convenience for `Deserialize` implementations.</span>
<span class='doccomment'>/// `MapVisitor` implementations should not override the default behavior.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit_key</span><span class='op'><</span><span class='ident'>K</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>K</span><span class='op'>></span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>K</span>: <span class='ident'>Deserialize</span>
{
<span class='self'>self</span>.<span class='ident'>visit_key_seed</span>(<span class='ident'>PhantomData</span>)
}
<span class='doccomment'>/// This returns a `Ok(value)` for the next value in the map.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This method exists as a convenience for `Deserialize` implementations.</span>
<span class='doccomment'>/// `MapVisitor` implementations should not override the default behavior.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit_value</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Deserialize</span>
{
<span class='self'>self</span>.<span class='ident'>visit_value_seed</span>(<span class='ident'>PhantomData</span>)
}
<span class='doccomment'>/// This returns `Ok(Some((key, value)))` for the next (key-value) pair in</span>
<span class='doccomment'>/// the map, or `Ok(None)` if there are no more remaining items.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This method exists as a convenience for `Deserialize` implementations.</span>
<span class='doccomment'>/// `MapVisitor` implementations should not override the default behavior.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit</span><span class='op'><</span><span class='ident'>K</span>, <span class='ident'>V</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span>(<span class='ident'>K</span>, <span class='ident'>V</span>)<span class='op'>></span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>K</span>: <span class='ident'>Deserialize</span>,
<span class='ident'>V</span>: <span class='ident'>Deserialize</span>
{
<span class='self'>self</span>.<span class='ident'>visit_seed</span>(<span class='ident'>PhantomData</span>, <span class='ident'>PhantomData</span>)
}
<span class='doccomment'>/// Return the lower and upper bound of items remaining in the sequence.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>size_hint</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> (<span class='ident'>usize</span>, <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>usize</span><span class='op'>></span>) {
(<span class='number'>0</span>, <span class='prelude-val'>None</span>)
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>V_</span><span class='op'>></span> <span class='ident'>MapVisitor</span> <span class='kw'>for</span> <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='kw-2'>mut</span> <span class='ident'>V_</span>
<span class='kw'>where</span> <span class='ident'>V_</span>: <span class='ident'>MapVisitor</span>
{
<span class='kw'>type</span> <span class='ident'>Error</span> <span class='op'>=</span> <span class='ident'>V_</span>::<span class='ident'>Error</span>;
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit_key_seed</span><span class='op'><</span><span class='ident'>K</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>seed</span>: <span class='ident'>K</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>K</span>::<span class='ident'>Value</span><span class='op'>></span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>K</span>: <span class='ident'>DeserializeSeed</span>
{
(<span class='kw-2'>*</span><span class='kw-2'>*</span><span class='self'>self</span>).<span class='ident'>visit_key_seed</span>(<span class='ident'>seed</span>)
}
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit_value_seed</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>seed</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>DeserializeSeed</span>
{
(<span class='kw-2'>*</span><span class='kw-2'>*</span><span class='self'>self</span>).<span class='ident'>visit_value_seed</span>(<span class='ident'>seed</span>)
}
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit_seed</span><span class='op'><</span><span class='ident'>K</span>, <span class='ident'>V</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>,
<span class='ident'>kseed</span>: <span class='ident'>K</span>,
<span class='ident'>vseed</span>: <span class='ident'>V</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span>(<span class='ident'>K</span>::<span class='ident'>Value</span>, <span class='ident'>V</span>::<span class='ident'>Value</span>)<span class='op'>></span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>K</span>: <span class='ident'>DeserializeSeed</span>,
<span class='ident'>V</span>: <span class='ident'>DeserializeSeed</span>
{
(<span class='kw-2'>*</span><span class='kw-2'>*</span><span class='self'>self</span>).<span class='ident'>visit_seed</span>(<span class='ident'>kseed</span>, <span class='ident'>vseed</span>)
}
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit</span><span class='op'><</span><span class='ident'>K</span>, <span class='ident'>V</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span>(<span class='ident'>K</span>, <span class='ident'>V</span>)<span class='op'>></span>, <span class='ident'>V_</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>K</span>: <span class='ident'>Deserialize</span>,
<span class='ident'>V</span>: <span class='ident'>Deserialize</span>
{
(<span class='kw-2'>*</span><span class='kw-2'>*</span><span class='self'>self</span>).<span class='ident'>visit</span>()
}
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit_key</span><span class='op'><</span><span class='ident'>K</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>K</span><span class='op'>></span>, <span class='ident'>V_</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>K</span>: <span class='ident'>Deserialize</span>
{
(<span class='kw-2'>*</span><span class='kw-2'>*</span><span class='self'>self</span>).<span class='ident'>visit_key</span>()
}
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit_value</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>, <span class='ident'>V_</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Deserialize</span>
{
(<span class='kw-2'>*</span><span class='kw-2'>*</span><span class='self'>self</span>).<span class='ident'>visit_value</span>()
}
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>size_hint</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> (<span class='ident'>usize</span>, <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>usize</span><span class='op'>></span>) {
(<span class='kw-2'>*</span><span class='kw-2'>*</span><span class='self'>self</span>).<span class='ident'>size_hint</span>()
}
}
<span class='comment'>///////////////////////////////////////////////////////////////////////////////</span>
<span class='doccomment'>/// `EnumVisitor` is a visitor that is created by the `Deserializer` and passed</span>
<span class='doccomment'>/// to the `Deserialize` in order to identify which variant of an enum to</span>
<span class='doccomment'>/// deserialize.</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>EnumVisitor</span>: <span class='ident'>Sized</span> {
<span class='doccomment'>/// The error type that can be returned if some error occurs during</span>
<span class='doccomment'>/// deserialization.</span>
<span class='kw'>type</span> <span class='ident'>Error</span>: <span class='ident'>Error</span>;
<span class='doccomment'>/// The `Visitor` that will be used to deserialize the content of the enum</span>
<span class='doccomment'>/// variant.</span>
<span class='kw'>type</span> <span class='ident'>Variant</span>: <span class='ident'>VariantVisitor</span><span class='op'><</span><span class='ident'>Error</span> <span class='op'>=</span> <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>;
<span class='doccomment'>/// `visit_variant` is called to identify which variant to deserialize.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `Deserialize` implementations should typically use</span>
<span class='doccomment'>/// `EnumVisitor::visit_variant` instead.</span>
<span class='kw'>fn</span> <span class='ident'>visit_variant_seed</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>seed</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(<span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Variant</span>), <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>DeserializeSeed</span>;
<span class='doccomment'>/// `visit_variant` is called to identify which variant to deserialize.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This method exists as a convenience for `Deserialize` implementations.</span>
<span class='doccomment'>/// `EnumVisitor` implementations should not override the default behavior.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit_variant</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(<span class='ident'>V</span>, <span class='self'>Self</span>::<span class='ident'>Variant</span>), <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Deserialize</span>
{
<span class='self'>self</span>.<span class='ident'>visit_variant_seed</span>(<span class='ident'>PhantomData</span>)
}
}
<span class='doccomment'>/// `VariantVisitor` is a visitor that is created by the `Deserializer` and</span>
<span class='doccomment'>/// passed to the `Deserialize` to deserialize the content of a particular enum</span>
<span class='doccomment'>/// variant.</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>VariantVisitor</span>: <span class='ident'>Sized</span> {
<span class='doccomment'>/// The error type that can be returned if some error occurs during</span>
<span class='doccomment'>/// deserialization. Must match the error type of our `EnumVisitor`.</span>
<span class='kw'>type</span> <span class='ident'>Error</span>: <span class='ident'>Error</span>;
<span class='doccomment'>/// Called when deserializing a variant with no values.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// If the data contains a different type of variant, the following</span>
<span class='doccomment'>/// `invalid_type` error should be constructed:</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust,ignore</span>
<span class='doccomment'>/// fn visit_unit(self) -> Result<(), Self::Error> {</span>
<span class='doccomment'>/// // What the data actually contained; suppose it is a tuple variant.</span>
<span class='doccomment'>/// let unexp = Unexpected::TupleVariant;</span>
<span class='doccomment'>/// Err(de::Error::invalid_type(unexp, &"unit variant"))</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// ```</span>
<span class='kw'>fn</span> <span class='ident'>visit_unit</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>;
<span class='doccomment'>/// Called when deserializing a variant with a single value.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `Deserialize` implementations should typically use</span>
<span class='doccomment'>/// `VariantVisitor::visit_newtype` instead.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// If the data contains a different type of variant, the following</span>
<span class='doccomment'>/// `invalid_type` error should be constructed:</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust,ignore</span>
<span class='doccomment'>/// fn visit_newtype_seed<T>(self, _seed: T) -> Result<T::Value, Self::Error></span>
<span class='doccomment'>/// where T: de::DeserializeSeed</span>
<span class='doccomment'>/// {</span>
<span class='doccomment'>/// // What the data actually contained; suppose it is a unit variant.</span>
<span class='doccomment'>/// let unexp = Unexpected::UnitVariant;</span>
<span class='doccomment'>/// Err(de::Error::invalid_type(unexp, &"newtype variant"))</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// ```</span>
<span class='kw'>fn</span> <span class='ident'>visit_newtype_seed</span><span class='op'><</span><span class='ident'>T</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>seed</span>: <span class='ident'>T</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>T</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>T</span>: <span class='ident'>DeserializeSeed</span>;
<span class='doccomment'>/// Called when deserializing a variant with a single value.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This method exists as a convenience for `Deserialize` implementations.</span>
<span class='doccomment'>/// `VariantVisitor` implementations should not override the default</span>
<span class='doccomment'>/// behavior.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>visit_newtype</span><span class='op'><</span><span class='ident'>T</span><span class='op'>></span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>T</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>T</span>: <span class='ident'>Deserialize</span>
{
<span class='self'>self</span>.<span class='ident'>visit_newtype_seed</span>(<span class='ident'>PhantomData</span>)
}
<span class='doccomment'>/// Called when deserializing a tuple-like variant.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `len` is the number of fields expected in the tuple variant.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// If the data contains a different type of variant, the following</span>
<span class='doccomment'>/// `invalid_type` error should be constructed:</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust,ignore</span>
<span class='doccomment'>/// fn visit_tuple<V>(self,</span>
<span class='doccomment'>/// _len: usize,</span>
<span class='doccomment'>/// _visitor: V) -> Result<V::Value, Self::Error></span>
<span class='doccomment'>/// where V: Visitor</span>
<span class='doccomment'>/// {</span>
<span class='doccomment'>/// // What the data actually contained; suppose it is a unit variant.</span>
<span class='doccomment'>/// let unexp = Unexpected::UnitVariant;</span>
<span class='doccomment'>/// Err(Error::invalid_type(unexp, &"tuple variant"))</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// ```</span>
<span class='kw'>fn</span> <span class='ident'>visit_tuple</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>len</span>: <span class='ident'>usize</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
<span class='doccomment'>/// Called when deserializing a struct-like variant.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `fields` are the names of the fields of the struct variant.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// If the data contains a different type of variant, the following</span>
<span class='doccomment'>/// `invalid_type` error should be constructed:</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust,ignore</span>
<span class='doccomment'>/// fn visit_struct<V>(self,</span>
<span class='doccomment'>/// _fields: &'static [&'static str],</span>
<span class='doccomment'>/// _visitor: V) -> Result<V::Value, Self::Error></span>
<span class='doccomment'>/// where V: Visitor</span>
<span class='doccomment'>/// {</span>
<span class='doccomment'>/// // What the data actually contained; suppose it is a unit variant.</span>
<span class='doccomment'>/// let unexp = Unexpected::UnitVariant;</span>
<span class='doccomment'>/// Err(Error::invalid_type(unexp, &"struct variant"))</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// ```</span>
<span class='kw'>fn</span> <span class='ident'>visit_struct</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>,
<span class='ident'>fields</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> [<span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>],
<span class='ident'>visitor</span>: <span class='ident'>V</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='self'>Self</span>::<span class='ident'>Error</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>;
}
<span class='comment'>///////////////////////////////////////////////////////////////////////////////</span>
<span class='doccomment'>/// Used in error messages.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// - expected `a`</span>
<span class='doccomment'>/// - expected `a` or `b`</span>
<span class='doccomment'>/// - expected one of `a`, `b`, `c`</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The slice of names must not be empty.</span>
<span class='kw'>struct</span> <span class='ident'>OneOf</span> {
<span class='ident'>names</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> [<span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>],
}
<span class='kw'>impl</span> <span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>OneOf</span> {
<span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>formatter</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>names</span>.<span class='ident'>len</span>() {
<span class='number'>0</span> <span class='op'>=></span> <span class='macro'>panic</span><span class='macro'>!</span>(), <span class='comment'>// special case elsewhere</span>
<span class='number'>1</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"`{}`"</span>, <span class='self'>self</span>.<span class='ident'>names</span>[<span class='number'>0</span>]),
<span class='number'>2</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"`{}` or `{}`"</span>, <span class='self'>self</span>.<span class='ident'>names</span>[<span class='number'>0</span>], <span class='self'>self</span>.<span class='ident'>names</span>[<span class='number'>1</span>]),
_ <span class='op'>=></span> {
<span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"one of "</span>));
<span class='kw'>for</span> (<span class='ident'>i</span>, <span class='ident'>alt</span>) <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>names</span>.<span class='ident'>iter</span>().<span class='ident'>enumerate</span>() {
<span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>></span> <span class='number'>0</span> {
<span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>", "</span>));
}
<span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>formatter</span>, <span class='string'>"`{}`"</span>, <span class='ident'>alt</span>));
}
<span class='prelude-val'>Ok</span>(())
}
}
}
}
</pre>
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