785 lines
21 KiB
Rust
785 lines
21 KiB
Rust
use crate::error::Error;
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use alloc::borrow::ToOwned;
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use alloc::boxed::Box;
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use alloc::string::String;
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use core::fmt::{self, Debug, Display};
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use core::mem;
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use serde::de::value::BorrowedStrDeserializer;
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use serde::de::{
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self, Deserialize, DeserializeSeed, Deserializer, IntoDeserializer, MapAccess, Unexpected,
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Visitor,
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};
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use serde::forward_to_deserialize_any;
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use serde::ser::{Serialize, SerializeStruct, Serializer};
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/// Reference to a range of bytes encompassing a single valid JSON value in the
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/// input data.
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///
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/// A `RawValue` can be used to defer parsing parts of a payload until later,
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/// or to avoid parsing it at all in the case that part of the payload just
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/// needs to be transferred verbatim into a different output object.
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///
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/// When serializing, a value of this type will retain its original formatting
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/// and will not be minified or pretty-printed.
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///
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/// # Note
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///
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/// `RawValue` is only available if serde\_json is built with the `"raw_value"`
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/// feature.
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///
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/// ```toml
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/// [dependencies]
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/// serde_json = { version = "1.0", features = ["raw_value"] }
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/// ```
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///
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/// # Example
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///
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/// ```
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/// use serde::{Deserialize, Serialize};
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/// use serde_json::{Result, value::RawValue};
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///
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/// #[derive(Deserialize)]
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/// struct Input<'a> {
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/// code: u32,
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/// #[serde(borrow)]
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/// payload: &'a RawValue,
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/// }
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///
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/// #[derive(Serialize)]
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/// struct Output<'a> {
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/// info: (u32, &'a RawValue),
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/// }
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///
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/// // Efficiently rearrange JSON input containing separate "code" and "payload"
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/// // keys into a single "info" key holding an array of code and payload.
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/// //
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/// // This could be done equivalently using serde_json::Value as the type for
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/// // payload, but &RawValue will perform better because it does not require
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/// // memory allocation. The correct range of bytes is borrowed from the input
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/// // data and pasted verbatim into the output.
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/// fn rearrange(input: &str) -> Result<String> {
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/// let input: Input = serde_json::from_str(input)?;
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///
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/// let output = Output {
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/// info: (input.code, input.payload),
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/// };
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///
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/// serde_json::to_string(&output)
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/// }
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///
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/// fn main() -> Result<()> {
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/// let out = rearrange(r#" {"code": 200, "payload": {}} "#)?;
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///
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/// assert_eq!(out, r#"{"info":[200,{}]}"#);
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///
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/// Ok(())
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/// }
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/// ```
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///
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/// # Ownership
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///
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/// The typical usage of `RawValue` will be in the borrowed form:
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///
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/// ```
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/// # use serde::Deserialize;
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/// # use serde_json::value::RawValue;
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/// #
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/// #[derive(Deserialize)]
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/// struct SomeStruct<'a> {
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/// #[serde(borrow)]
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/// raw_value: &'a RawValue,
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/// }
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/// ```
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///
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/// The borrowed form is suitable when deserializing through
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/// [`serde_json::from_str`] and [`serde_json::from_slice`] which support
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/// borrowing from the input data without memory allocation.
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///
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/// When deserializing through [`serde_json::from_reader`] you will need to use
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/// the boxed form of `RawValue` instead. This is almost as efficient but
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/// involves buffering the raw value from the I/O stream into memory.
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///
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/// [`serde_json::from_str`]: crate::from_str
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/// [`serde_json::from_slice`]: crate::from_slice
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/// [`serde_json::from_reader`]: crate::from_reader
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///
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/// ```
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/// # use serde::Deserialize;
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/// # use serde_json::value::RawValue;
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/// #
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/// #[derive(Deserialize)]
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/// struct SomeStruct {
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/// raw_value: Box<RawValue>,
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/// }
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/// ```
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#[cfg_attr(docsrs, doc(cfg(feature = "raw_value")))]
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#[repr(transparent)]
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pub struct RawValue {
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json: str,
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}
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impl RawValue {
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const fn from_borrowed(json: &str) -> &Self {
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unsafe { mem::transmute::<&str, &RawValue>(json) }
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}
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fn from_owned(json: Box<str>) -> Box<Self> {
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unsafe { mem::transmute::<Box<str>, Box<RawValue>>(json) }
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}
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fn into_owned(raw_value: Box<Self>) -> Box<str> {
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unsafe { mem::transmute::<Box<RawValue>, Box<str>>(raw_value) }
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}
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}
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impl Clone for Box<RawValue> {
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fn clone(&self) -> Self {
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(**self).to_owned()
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}
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}
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impl ToOwned for RawValue {
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type Owned = Box<RawValue>;
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fn to_owned(&self) -> Self::Owned {
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RawValue::from_owned(self.json.to_owned().into_boxed_str())
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}
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}
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impl Default for Box<RawValue> {
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fn default() -> Self {
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RawValue::NULL.to_owned()
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}
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}
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impl Debug for RawValue {
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fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter
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.debug_tuple("RawValue")
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.field(&format_args!("{}", &self.json))
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.finish()
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}
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}
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impl Display for RawValue {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.write_str(&self.json)
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}
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}
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impl RawValue {
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/// A constant RawValue with the JSON value `null`.
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pub const NULL: &'static RawValue = RawValue::from_borrowed("null");
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/// A constant RawValue with the JSON value `true`.
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pub const TRUE: &'static RawValue = RawValue::from_borrowed("true");
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/// A constant RawValue with the JSON value `false`.
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pub const FALSE: &'static RawValue = RawValue::from_borrowed("false");
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/// Convert an owned `String` of JSON data to an owned `RawValue`.
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///
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/// This function is equivalent to `serde_json::from_str::<Box<RawValue>>`
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/// except that we avoid an allocation and memcpy if both of the following
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/// are true:
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///
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/// - the input has no leading or trailing whitespace, and
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/// - the input has capacity equal to its length.
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pub fn from_string(json: String) -> Result<Box<Self>, Error> {
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let borrowed = tri!(crate::from_str::<&Self>(&json));
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if borrowed.json.len() < json.len() {
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return Ok(borrowed.to_owned());
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}
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Ok(Self::from_owned(json.into_boxed_str()))
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}
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/// Access the JSON text underlying a raw value.
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///
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/// # Example
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///
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/// ```
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/// use serde::Deserialize;
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/// use serde_json::{Result, value::RawValue};
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///
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/// #[derive(Deserialize)]
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/// struct Response<'a> {
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/// code: u32,
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/// #[serde(borrow)]
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/// payload: &'a RawValue,
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/// }
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///
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/// fn process(input: &str) -> Result<()> {
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/// let response: Response = serde_json::from_str(input)?;
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///
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/// let payload = response.payload.get();
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/// if payload.starts_with('{') {
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/// // handle a payload which is a JSON map
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/// } else {
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/// // handle any other type
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/// }
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///
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/// Ok(())
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/// }
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///
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/// fn main() -> Result<()> {
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/// process(r#" {"code": 200, "payload": {}} "#)?;
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/// Ok(())
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/// }
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/// ```
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pub fn get(&self) -> &str {
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&self.json
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}
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}
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impl From<Box<RawValue>> for Box<str> {
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fn from(raw_value: Box<RawValue>) -> Self {
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RawValue::into_owned(raw_value)
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}
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}
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/// Convert a `T` into a boxed `RawValue`.
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///
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/// # Example
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///
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/// ```
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/// // Upstream crate
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/// # #[derive(Serialize)]
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/// pub struct Thing {
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/// foo: String,
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/// bar: Option<String>,
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/// extra_data: Box<RawValue>,
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/// }
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///
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/// // Local crate
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/// use serde::Serialize;
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/// use serde_json::value::{to_raw_value, RawValue};
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///
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/// #[derive(Serialize)]
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/// struct MyExtraData {
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/// a: u32,
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/// b: u32,
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/// }
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///
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/// let my_thing = Thing {
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/// foo: "FooVal".into(),
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/// bar: None,
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/// extra_data: to_raw_value(&MyExtraData { a: 1, b: 2 }).unwrap(),
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/// };
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/// # assert_eq!(
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/// # serde_json::to_value(my_thing).unwrap(),
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/// # serde_json::json!({
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/// # "foo": "FooVal",
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/// # "bar": null,
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/// # "extra_data": { "a": 1, "b": 2 }
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/// # })
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/// # );
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/// ```
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///
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/// # Errors
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///
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/// This conversion can fail if `T`'s implementation of `Serialize` decides to
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/// fail, or if `T` contains a map with non-string keys.
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///
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/// ```
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/// use std::collections::BTreeMap;
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///
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/// // The keys in this map are vectors, not strings.
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/// let mut map = BTreeMap::new();
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/// map.insert(vec![32, 64], "x86");
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///
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/// println!("{}", serde_json::value::to_raw_value(&map).unwrap_err());
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/// ```
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#[cfg_attr(docsrs, doc(cfg(feature = "raw_value")))]
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pub fn to_raw_value<T>(value: &T) -> Result<Box<RawValue>, Error>
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where
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T: ?Sized + Serialize,
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{
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let json_string = tri!(crate::to_string(value));
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Ok(RawValue::from_owned(json_string.into_boxed_str()))
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}
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pub const TOKEN: &str = "$serde_json::private::RawValue";
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impl Serialize for RawValue {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: Serializer,
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{
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let mut s = tri!(serializer.serialize_struct(TOKEN, 1));
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tri!(s.serialize_field(TOKEN, &self.json));
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s.end()
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}
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}
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impl<'de: 'a, 'a> Deserialize<'de> for &'a RawValue {
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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where
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D: Deserializer<'de>,
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{
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struct ReferenceVisitor;
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impl<'de> Visitor<'de> for ReferenceVisitor {
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type Value = &'de RawValue;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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write!(formatter, "any valid JSON value")
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}
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fn visit_map<V>(self, mut visitor: V) -> Result<Self::Value, V::Error>
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where
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V: MapAccess<'de>,
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{
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let value = tri!(visitor.next_key::<RawKey>());
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if value.is_none() {
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return Err(de::Error::invalid_type(Unexpected::Map, &self));
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}
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visitor.next_value_seed(ReferenceFromString)
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}
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}
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deserializer.deserialize_newtype_struct(TOKEN, ReferenceVisitor)
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}
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}
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impl<'de> Deserialize<'de> for Box<RawValue> {
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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where
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D: Deserializer<'de>,
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{
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struct BoxedVisitor;
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impl<'de> Visitor<'de> for BoxedVisitor {
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type Value = Box<RawValue>;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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write!(formatter, "any valid JSON value")
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}
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fn visit_map<V>(self, mut visitor: V) -> Result<Self::Value, V::Error>
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where
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V: MapAccess<'de>,
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{
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let value = tri!(visitor.next_key::<RawKey>());
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if value.is_none() {
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return Err(de::Error::invalid_type(Unexpected::Map, &self));
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}
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visitor.next_value_seed(BoxedFromString)
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}
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}
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deserializer.deserialize_newtype_struct(TOKEN, BoxedVisitor)
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}
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}
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struct RawKey;
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impl<'de> Deserialize<'de> for RawKey {
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fn deserialize<D>(deserializer: D) -> Result<RawKey, D::Error>
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where
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D: Deserializer<'de>,
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{
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struct FieldVisitor;
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impl<'de> Visitor<'de> for FieldVisitor {
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type Value = ();
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("raw value")
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}
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fn visit_str<E>(self, s: &str) -> Result<(), E>
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where
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E: de::Error,
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{
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if s == TOKEN {
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Ok(())
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} else {
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Err(de::Error::custom("unexpected raw value"))
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}
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}
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}
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tri!(deserializer.deserialize_identifier(FieldVisitor));
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Ok(RawKey)
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}
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}
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pub struct ReferenceFromString;
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impl<'de> DeserializeSeed<'de> for ReferenceFromString {
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type Value = &'de RawValue;
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fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
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where
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D: Deserializer<'de>,
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{
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deserializer.deserialize_str(self)
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}
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}
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impl<'de> Visitor<'de> for ReferenceFromString {
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type Value = &'de RawValue;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("raw value")
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}
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fn visit_borrowed_str<E>(self, s: &'de str) -> Result<Self::Value, E>
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where
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E: de::Error,
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{
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Ok(RawValue::from_borrowed(s))
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}
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}
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pub struct BoxedFromString;
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impl<'de> DeserializeSeed<'de> for BoxedFromString {
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type Value = Box<RawValue>;
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fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
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where
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D: Deserializer<'de>,
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{
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deserializer.deserialize_str(self)
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}
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}
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impl<'de> Visitor<'de> for BoxedFromString {
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type Value = Box<RawValue>;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("raw value")
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}
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fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
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where
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E: de::Error,
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{
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Ok(RawValue::from_owned(s.to_owned().into_boxed_str()))
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}
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#[cfg(any(feature = "std", feature = "alloc"))]
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fn visit_string<E>(self, s: String) -> Result<Self::Value, E>
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where
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E: de::Error,
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{
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Ok(RawValue::from_owned(s.into_boxed_str()))
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}
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}
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struct RawKeyDeserializer;
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impl<'de> Deserializer<'de> for RawKeyDeserializer {
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type Error = Error;
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fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
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where
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V: de::Visitor<'de>,
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{
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visitor.visit_borrowed_str(TOKEN)
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}
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forward_to_deserialize_any! {
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bool u8 u16 u32 u64 u128 i8 i16 i32 i64 i128 f32 f64 char str string seq
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bytes byte_buf map struct option unit newtype_struct ignored_any
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unit_struct tuple_struct tuple enum identifier
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}
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}
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pub struct OwnedRawDeserializer {
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pub raw_value: Option<String>,
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}
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impl<'de> MapAccess<'de> for OwnedRawDeserializer {
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type Error = Error;
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fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Error>
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where
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K: de::DeserializeSeed<'de>,
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{
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if self.raw_value.is_none() {
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return Ok(None);
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}
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seed.deserialize(RawKeyDeserializer).map(Some)
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}
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fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error>
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where
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V: de::DeserializeSeed<'de>,
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{
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seed.deserialize(self.raw_value.take().unwrap().into_deserializer())
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}
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}
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pub struct BorrowedRawDeserializer<'de> {
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pub raw_value: Option<&'de str>,
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}
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impl<'de> MapAccess<'de> for BorrowedRawDeserializer<'de> {
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type Error = Error;
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fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Error>
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where
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K: de::DeserializeSeed<'de>,
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{
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if self.raw_value.is_none() {
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return Ok(None);
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}
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seed.deserialize(RawKeyDeserializer).map(Some)
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}
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fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error>
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|
where
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V: de::DeserializeSeed<'de>,
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{
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seed.deserialize(BorrowedStrDeserializer::new(self.raw_value.take().unwrap()))
|
|
}
|
|
}
|
|
|
|
impl<'de> IntoDeserializer<'de, Error> for &'de RawValue {
|
|
type Deserializer = &'de RawValue;
|
|
|
|
fn into_deserializer(self) -> Self::Deserializer {
|
|
self
|
|
}
|
|
}
|
|
|
|
impl<'de> Deserializer<'de> for &'de RawValue {
|
|
type Error = Error;
|
|
|
|
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_any(visitor)
|
|
}
|
|
|
|
fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_bool(visitor)
|
|
}
|
|
|
|
fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_i8(visitor)
|
|
}
|
|
|
|
fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_i16(visitor)
|
|
}
|
|
|
|
fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_i32(visitor)
|
|
}
|
|
|
|
fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_i64(visitor)
|
|
}
|
|
|
|
fn deserialize_i128<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_i128(visitor)
|
|
}
|
|
|
|
fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_u8(visitor)
|
|
}
|
|
|
|
fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_u16(visitor)
|
|
}
|
|
|
|
fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_u32(visitor)
|
|
}
|
|
|
|
fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_u64(visitor)
|
|
}
|
|
|
|
fn deserialize_u128<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_u128(visitor)
|
|
}
|
|
|
|
fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_f32(visitor)
|
|
}
|
|
|
|
fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_f64(visitor)
|
|
}
|
|
|
|
fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_char(visitor)
|
|
}
|
|
|
|
fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_str(visitor)
|
|
}
|
|
|
|
fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_string(visitor)
|
|
}
|
|
|
|
fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_bytes(visitor)
|
|
}
|
|
|
|
fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_byte_buf(visitor)
|
|
}
|
|
|
|
fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_option(visitor)
|
|
}
|
|
|
|
fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_unit(visitor)
|
|
}
|
|
|
|
fn deserialize_unit_struct<V>(self, name: &'static str, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_unit_struct(name, visitor)
|
|
}
|
|
|
|
fn deserialize_newtype_struct<V>(
|
|
self,
|
|
name: &'static str,
|
|
visitor: V,
|
|
) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_newtype_struct(name, visitor)
|
|
}
|
|
|
|
fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_seq(visitor)
|
|
}
|
|
|
|
fn deserialize_tuple<V>(self, len: usize, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_tuple(len, visitor)
|
|
}
|
|
|
|
fn deserialize_tuple_struct<V>(
|
|
self,
|
|
name: &'static str,
|
|
len: usize,
|
|
visitor: V,
|
|
) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_tuple_struct(name, len, visitor)
|
|
}
|
|
|
|
fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_map(visitor)
|
|
}
|
|
|
|
fn deserialize_struct<V>(
|
|
self,
|
|
name: &'static str,
|
|
fields: &'static [&'static str],
|
|
visitor: V,
|
|
) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_struct(name, fields, visitor)
|
|
}
|
|
|
|
fn deserialize_enum<V>(
|
|
self,
|
|
name: &'static str,
|
|
variants: &'static [&'static str],
|
|
visitor: V,
|
|
) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_enum(name, variants, visitor)
|
|
}
|
|
|
|
fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_identifier(visitor)
|
|
}
|
|
|
|
fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: Visitor<'de>,
|
|
{
|
|
crate::Deserializer::from_str(&self.json).deserialize_ignored_any(visitor)
|
|
}
|
|
}
|