mirror of
https://github.com/serde-rs/json.git
synced 2025-10-02 07:21:29 +00:00
753 lines
21 KiB
Rust
753 lines
21 KiB
Rust
use error::Error;
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use serde::de::{self, Unexpected, Visitor};
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use serde::{Deserialize, Deserializer, Serialize, Serializer};
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use std::fmt::{self, Debug, Display};
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#[cfg(feature = "arbitrary_precision")]
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use itoa;
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#[cfg(feature = "arbitrary_precision")]
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use ryu;
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#[cfg(feature = "arbitrary_precision")]
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use serde::de::{IntoDeserializer, MapAccess};
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use de::ParserNumber;
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#[cfg(feature = "arbitrary_precision")]
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use error::ErrorCode;
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#[cfg(feature = "arbitrary_precision")]
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/// Not public API. Should be pub(crate).
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#[doc(hidden)]
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pub const TOKEN: &'static str = "$serde_json::private::Number";
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/// Represents a JSON number, whether integer or floating point.
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#[derive(Clone, PartialEq)]
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pub struct Number {
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n: N,
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}
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#[cfg(not(feature = "arbitrary_precision"))]
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#[derive(Copy, Clone, PartialEq)]
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enum N {
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PosInt(u64),
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/// Always less than zero.
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NegInt(i64),
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/// Always finite.
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Float(f64),
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}
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#[cfg(feature = "arbitrary_precision")]
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type N = String;
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impl Number {
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/// Returns true if the `Number` is an integer between `i64::MIN` and
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/// `i64::MAX`.
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///
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/// For any Number on which `is_i64` returns true, `as_i64` is guaranteed to
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/// return the integer value.
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///
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/// ```edition2018
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/// # use serde_json::json;
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/// #
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/// let big = i64::max_value() as u64 + 10;
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/// let v = json!({ "a": 64, "b": big, "c": 256.0 });
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///
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/// assert!(v["a"].is_i64());
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///
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/// // Greater than i64::MAX.
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/// assert!(!v["b"].is_i64());
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///
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/// // Numbers with a decimal point are not considered integers.
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/// assert!(!v["c"].is_i64());
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/// ```
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#[inline]
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pub fn is_i64(&self) -> bool {
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#[cfg(not(feature = "arbitrary_precision"))]
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match self.n {
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N::PosInt(v) => v <= i64::max_value() as u64,
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N::NegInt(_) => true,
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N::Float(_) => false,
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}
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#[cfg(feature = "arbitrary_precision")]
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self.as_i64().is_some()
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}
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/// Returns true if the `Number` is an integer between zero and `u64::MAX`.
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///
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/// For any Number on which `is_u64` returns true, `as_u64` is guaranteed to
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/// return the integer value.
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///
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/// ```edition2018
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/// # use serde_json::json;
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/// #
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/// let v = json!({ "a": 64, "b": -64, "c": 256.0 });
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///
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/// assert!(v["a"].is_u64());
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///
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/// // Negative integer.
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/// assert!(!v["b"].is_u64());
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///
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/// // Numbers with a decimal point are not considered integers.
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/// assert!(!v["c"].is_u64());
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/// ```
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#[inline]
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pub fn is_u64(&self) -> bool {
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#[cfg(not(feature = "arbitrary_precision"))]
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match self.n {
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N::PosInt(_) => true,
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N::NegInt(_) | N::Float(_) => false,
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}
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#[cfg(feature = "arbitrary_precision")]
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self.as_u64().is_some()
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}
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/// Returns true if the `Number` can be represented by f64.
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///
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/// For any Number on which `is_f64` returns true, `as_f64` is guaranteed to
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/// return the floating point value.
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///
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/// Currently this function returns true if and only if both `is_i64` and
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/// `is_u64` return false but this is not a guarantee in the future.
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///
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/// ```edition2018
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/// # use serde_json::json;
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/// #
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/// let v = json!({ "a": 256.0, "b": 64, "c": -64 });
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///
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/// assert!(v["a"].is_f64());
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///
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/// // Integers.
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/// assert!(!v["b"].is_f64());
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/// assert!(!v["c"].is_f64());
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/// ```
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#[inline]
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pub fn is_f64(&self) -> bool {
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#[cfg(not(feature = "arbitrary_precision"))]
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match self.n {
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N::Float(_) => true,
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N::PosInt(_) | N::NegInt(_) => false,
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}
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#[cfg(feature = "arbitrary_precision")]
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{
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for c in self.n.chars() {
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if c == '.' || c == 'e' || c == 'E' {
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return self.n.parse::<f64>().ok().map_or(false, |f| f.is_finite());
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}
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}
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false
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}
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}
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/// If the `Number` is an integer, represent it as i64 if possible. Returns
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/// None otherwise.
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///
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/// ```edition2018
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/// # use serde_json::json;
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/// #
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/// let big = i64::max_value() as u64 + 10;
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/// let v = json!({ "a": 64, "b": big, "c": 256.0 });
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///
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/// assert_eq!(v["a"].as_i64(), Some(64));
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/// assert_eq!(v["b"].as_i64(), None);
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/// assert_eq!(v["c"].as_i64(), None);
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/// ```
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#[inline]
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pub fn as_i64(&self) -> Option<i64> {
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#[cfg(not(feature = "arbitrary_precision"))]
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match self.n {
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N::PosInt(n) => {
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if n <= i64::max_value() as u64 {
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Some(n as i64)
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} else {
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None
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}
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}
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N::NegInt(n) => Some(n),
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N::Float(_) => None,
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}
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#[cfg(feature = "arbitrary_precision")]
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self.n.parse().ok()
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}
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/// If the `Number` is an integer, represent it as u64 if possible. Returns
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/// None otherwise.
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///
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/// ```edition2018
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/// # use serde_json::json;
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/// #
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/// let v = json!({ "a": 64, "b": -64, "c": 256.0 });
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///
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/// assert_eq!(v["a"].as_u64(), Some(64));
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/// assert_eq!(v["b"].as_u64(), None);
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/// assert_eq!(v["c"].as_u64(), None);
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/// ```
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#[inline]
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pub fn as_u64(&self) -> Option<u64> {
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#[cfg(not(feature = "arbitrary_precision"))]
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match self.n {
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N::PosInt(n) => Some(n),
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N::NegInt(_) | N::Float(_) => None,
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}
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#[cfg(feature = "arbitrary_precision")]
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self.n.parse().ok()
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}
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/// Represents the number as f64 if possible. Returns None otherwise.
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///
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/// ```edition2018
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/// # use serde_json::json;
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/// #
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/// let v = json!({ "a": 256.0, "b": 64, "c": -64 });
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///
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/// assert_eq!(v["a"].as_f64(), Some(256.0));
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/// assert_eq!(v["b"].as_f64(), Some(64.0));
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/// assert_eq!(v["c"].as_f64(), Some(-64.0));
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/// ```
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#[inline]
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pub fn as_f64(&self) -> Option<f64> {
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#[cfg(not(feature = "arbitrary_precision"))]
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match self.n {
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N::PosInt(n) => Some(n as f64),
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N::NegInt(n) => Some(n as f64),
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N::Float(n) => Some(n),
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}
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#[cfg(feature = "arbitrary_precision")]
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self.n.parse().ok()
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}
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/// Converts a finite `f64` to a `Number`. Infinite or NaN values are not JSON
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/// numbers.
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///
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/// ```edition2018
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/// # use std::f64;
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/// #
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/// # use serde_json::Number;
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/// #
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/// assert!(Number::from_f64(256.0).is_some());
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///
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/// assert!(Number::from_f64(f64::NAN).is_none());
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/// ```
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#[inline]
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pub fn from_f64(f: f64) -> Option<Number> {
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if f.is_finite() {
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let n = {
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#[cfg(not(feature = "arbitrary_precision"))]
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{
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N::Float(f)
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}
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#[cfg(feature = "arbitrary_precision")]
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{
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ryu::Buffer::new().format_finite(f).to_owned()
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}
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};
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Some(Number { n: n })
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} else {
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None
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}
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}
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#[cfg(feature = "arbitrary_precision")]
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/// Not public API. Only tests use this.
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#[doc(hidden)]
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#[inline]
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pub fn from_string_unchecked(n: String) -> Self {
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Number { n: n }
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}
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}
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impl fmt::Display for Number {
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#[cfg(not(feature = "arbitrary_precision"))]
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fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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match self.n {
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N::PosInt(u) => Display::fmt(&u, formatter),
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N::NegInt(i) => Display::fmt(&i, formatter),
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N::Float(f) => Display::fmt(&f, formatter),
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}
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}
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#[cfg(feature = "arbitrary_precision")]
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fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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Display::fmt(&self.n, formatter)
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}
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}
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impl Debug for Number {
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#[cfg(not(feature = "arbitrary_precision"))]
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fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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let mut debug = formatter.debug_tuple("Number");
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match self.n {
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N::PosInt(i) => {
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debug.field(&i);
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}
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N::NegInt(i) => {
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debug.field(&i);
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}
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N::Float(f) => {
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debug.field(&f);
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}
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}
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debug.finish()
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}
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#[cfg(feature = "arbitrary_precision")]
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fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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write!(formatter, "Number({})", &self.n)
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}
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}
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impl Serialize for Number {
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#[cfg(not(feature = "arbitrary_precision"))]
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#[inline]
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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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match self.n {
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N::PosInt(u) => serializer.serialize_u64(u),
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N::NegInt(i) => serializer.serialize_i64(i),
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N::Float(f) => serializer.serialize_f64(f),
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}
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}
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#[cfg(feature = "arbitrary_precision")]
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#[inline]
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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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use serde::ser::SerializeStruct;
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let mut s = serializer.serialize_struct(TOKEN, 1)?;
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s.serialize_field(TOKEN, &self.n)?;
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s.end()
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}
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}
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impl<'de> Deserialize<'de> for Number {
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#[inline]
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fn deserialize<D>(deserializer: D) -> Result<Number, D::Error>
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where
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D: Deserializer<'de>,
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{
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struct NumberVisitor;
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impl<'de> Visitor<'de> for NumberVisitor {
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type Value = Number;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("a JSON number")
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}
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#[inline]
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fn visit_i64<E>(self, value: i64) -> Result<Number, E> {
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Ok(value.into())
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}
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#[inline]
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fn visit_u64<E>(self, value: u64) -> Result<Number, E> {
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Ok(value.into())
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}
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#[inline]
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fn visit_f64<E>(self, value: f64) -> Result<Number, E>
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where
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E: de::Error,
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{
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Number::from_f64(value).ok_or_else(|| de::Error::custom("not a JSON number"))
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}
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#[cfg(feature = "arbitrary_precision")]
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#[inline]
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fn visit_map<V>(self, mut visitor: V) -> Result<Number, V::Error>
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where
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V: de::MapAccess<'de>,
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{
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let value = visitor.next_key::<NumberKey>()?;
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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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let v: NumberFromString = visitor.next_value()?;
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Ok(v.value)
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}
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}
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deserializer.deserialize_any(NumberVisitor)
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}
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}
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#[cfg(feature = "arbitrary_precision")]
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struct NumberKey;
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#[cfg(feature = "arbitrary_precision")]
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impl<'de> de::Deserialize<'de> for NumberKey {
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fn deserialize<D>(deserializer: D) -> Result<NumberKey, D::Error>
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where
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D: de::Deserializer<'de>,
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{
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struct FieldVisitor;
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impl<'de> 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("a valid number field")
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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("expected field with custom name"))
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}
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}
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}
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deserializer.deserialize_identifier(FieldVisitor)?;
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Ok(NumberKey)
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}
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}
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#[cfg(feature = "arbitrary_precision")]
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pub struct NumberFromString {
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pub value: Number,
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}
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#[cfg(feature = "arbitrary_precision")]
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impl<'de> de::Deserialize<'de> for NumberFromString {
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fn deserialize<D>(deserializer: D) -> Result<NumberFromString, D::Error>
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where
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D: de::Deserializer<'de>,
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{
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struct Visitor;
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impl<'de> de::Visitor<'de> for Visitor {
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type Value = NumberFromString;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("string containing a number")
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}
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fn visit_str<E>(self, s: &str) -> Result<NumberFromString, E>
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where
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E: de::Error,
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{
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let n = try!(s.parse().map_err(de::Error::custom));
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Ok(NumberFromString { value: n })
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}
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}
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deserializer.deserialize_str(Visitor)
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}
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}
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#[cfg(feature = "arbitrary_precision")]
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fn invalid_number() -> Error {
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Error::syntax(ErrorCode::InvalidNumber, 0, 0)
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}
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macro_rules! deserialize_any {
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(@expand [$($num_string:tt)*]) => {
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#[cfg(not(feature = "arbitrary_precision"))]
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#[inline]
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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: Visitor<'de>,
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{
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match self.n {
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N::PosInt(u) => visitor.visit_u64(u),
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N::NegInt(i) => visitor.visit_i64(i),
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N::Float(f) => visitor.visit_f64(f),
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}
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}
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#[cfg(feature = "arbitrary_precision")]
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#[inline]
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fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
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where V: Visitor<'de>
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{
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if let Some(u) = self.as_u64() {
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return visitor.visit_u64(u);
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} else if let Some(i) = self.as_i64() {
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return visitor.visit_i64(i);
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} else if let Some(f) = self.as_f64() {
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if ryu::Buffer::new().format_finite(f) == self.n || f.to_string() == self.n {
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return visitor.visit_f64(f);
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}
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}
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visitor.visit_map(NumberDeserializer {
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number: Some(self.$($num_string)*),
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})
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}
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};
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(owned) => {
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deserialize_any!(@expand [n]);
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};
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(ref) => {
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deserialize_any!(@expand [n.clone()]);
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};
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}
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macro_rules! deserialize_number {
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($deserialize:ident => $visit:ident) => {
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#[cfg(not(feature = "arbitrary_precision"))]
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fn $deserialize<V>(self, visitor: V) -> Result<V::Value, Error>
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where
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V: Visitor<'de>,
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{
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self.deserialize_any(visitor)
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}
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#[cfg(feature = "arbitrary_precision")]
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fn $deserialize<V>(self, visitor: V) -> Result<V::Value, Error>
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where
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V: de::Visitor<'de>,
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{
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visitor.$visit(self.n.parse().map_err(|_| invalid_number())?)
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}
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}
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}
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impl<'de> Deserializer<'de> for Number {
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type Error = Error;
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deserialize_any!(owned);
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deserialize_number!(deserialize_i8 => visit_i8);
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deserialize_number!(deserialize_i16 => visit_i16);
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deserialize_number!(deserialize_i32 => visit_i32);
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deserialize_number!(deserialize_i64 => visit_i64);
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deserialize_number!(deserialize_u8 => visit_u8);
|
|
deserialize_number!(deserialize_u16 => visit_u16);
|
|
deserialize_number!(deserialize_u32 => visit_u32);
|
|
deserialize_number!(deserialize_u64 => visit_u64);
|
|
deserialize_number!(deserialize_f32 => visit_f32);
|
|
deserialize_number!(deserialize_f64 => visit_f64);
|
|
|
|
serde_if_integer128! {
|
|
deserialize_number!(deserialize_i128 => visit_i128);
|
|
deserialize_number!(deserialize_u128 => visit_u128);
|
|
}
|
|
|
|
forward_to_deserialize_any! {
|
|
bool char str string bytes byte_buf option unit unit_struct
|
|
newtype_struct seq tuple tuple_struct map struct enum identifier
|
|
ignored_any
|
|
}
|
|
}
|
|
|
|
impl<'de, 'a> Deserializer<'de> for &'a Number {
|
|
type Error = Error;
|
|
|
|
deserialize_any!(ref);
|
|
|
|
deserialize_number!(deserialize_i8 => visit_i8);
|
|
deserialize_number!(deserialize_i16 => visit_i16);
|
|
deserialize_number!(deserialize_i32 => visit_i32);
|
|
deserialize_number!(deserialize_i64 => visit_i64);
|
|
deserialize_number!(deserialize_u8 => visit_u8);
|
|
deserialize_number!(deserialize_u16 => visit_u16);
|
|
deserialize_number!(deserialize_u32 => visit_u32);
|
|
deserialize_number!(deserialize_u64 => visit_u64);
|
|
deserialize_number!(deserialize_f32 => visit_f32);
|
|
deserialize_number!(deserialize_f64 => visit_f64);
|
|
|
|
serde_if_integer128! {
|
|
deserialize_number!(deserialize_i128 => visit_i128);
|
|
deserialize_number!(deserialize_u128 => visit_u128);
|
|
}
|
|
|
|
forward_to_deserialize_any! {
|
|
bool char str string bytes byte_buf option unit unit_struct
|
|
newtype_struct seq tuple tuple_struct map struct enum identifier
|
|
ignored_any
|
|
}
|
|
}
|
|
|
|
#[cfg(feature = "arbitrary_precision")]
|
|
// Not public API. Should be pub(crate).
|
|
#[doc(hidden)]
|
|
pub struct NumberDeserializer {
|
|
pub number: Option<String>,
|
|
}
|
|
|
|
#[cfg(feature = "arbitrary_precision")]
|
|
impl<'de> MapAccess<'de> for NumberDeserializer {
|
|
type Error = Error;
|
|
|
|
fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Error>
|
|
where
|
|
K: de::DeserializeSeed<'de>,
|
|
{
|
|
if self.number.is_none() {
|
|
return Ok(None);
|
|
}
|
|
seed.deserialize(NumberFieldDeserializer).map(Some)
|
|
}
|
|
|
|
fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error>
|
|
where
|
|
V: de::DeserializeSeed<'de>,
|
|
{
|
|
seed.deserialize(self.number.take().unwrap().into_deserializer())
|
|
}
|
|
}
|
|
|
|
#[cfg(feature = "arbitrary_precision")]
|
|
struct NumberFieldDeserializer;
|
|
|
|
#[cfg(feature = "arbitrary_precision")]
|
|
impl<'de> Deserializer<'de> for NumberFieldDeserializer {
|
|
type Error = Error;
|
|
|
|
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
|
|
where
|
|
V: de::Visitor<'de>,
|
|
{
|
|
visitor.visit_borrowed_str(TOKEN)
|
|
}
|
|
|
|
forward_to_deserialize_any! {
|
|
bool u8 u16 u32 u64 u128 i8 i16 i32 i64 i128 f32 f64 char str string seq
|
|
bytes byte_buf map struct option unit newtype_struct ignored_any
|
|
unit_struct tuple_struct tuple enum identifier
|
|
}
|
|
}
|
|
|
|
impl From<ParserNumber> for Number {
|
|
fn from(value: ParserNumber) -> Self {
|
|
let n = match value {
|
|
ParserNumber::F64(f) => {
|
|
#[cfg(not(feature = "arbitrary_precision"))]
|
|
{
|
|
N::Float(f)
|
|
}
|
|
#[cfg(feature = "arbitrary_precision")]
|
|
{
|
|
f.to_string()
|
|
}
|
|
}
|
|
ParserNumber::U64(u) => {
|
|
#[cfg(not(feature = "arbitrary_precision"))]
|
|
{
|
|
N::PosInt(u)
|
|
}
|
|
#[cfg(feature = "arbitrary_precision")]
|
|
{
|
|
u.to_string()
|
|
}
|
|
}
|
|
ParserNumber::I64(i) => {
|
|
#[cfg(not(feature = "arbitrary_precision"))]
|
|
{
|
|
N::NegInt(i)
|
|
}
|
|
#[cfg(feature = "arbitrary_precision")]
|
|
{
|
|
i.to_string()
|
|
}
|
|
}
|
|
#[cfg(feature = "arbitrary_precision")]
|
|
ParserNumber::String(s) => s,
|
|
};
|
|
Number { n: n }
|
|
}
|
|
}
|
|
|
|
macro_rules! impl_from_unsigned {
|
|
(
|
|
$($ty:ty),*
|
|
) => {
|
|
$(
|
|
impl From<$ty> for Number {
|
|
#[inline]
|
|
fn from(u: $ty) -> Self {
|
|
let n = {
|
|
#[cfg(not(feature = "arbitrary_precision"))]
|
|
{ N::PosInt(u as u64) }
|
|
#[cfg(feature = "arbitrary_precision")]
|
|
{
|
|
itoa::Buffer::new().format(u).to_owned()
|
|
}
|
|
};
|
|
Number { n: n }
|
|
}
|
|
}
|
|
)*
|
|
};
|
|
}
|
|
|
|
macro_rules! impl_from_signed {
|
|
(
|
|
$($ty:ty),*
|
|
) => {
|
|
$(
|
|
impl From<$ty> for Number {
|
|
#[inline]
|
|
fn from(i: $ty) -> Self {
|
|
let n = {
|
|
#[cfg(not(feature = "arbitrary_precision"))]
|
|
{
|
|
if i < 0 {
|
|
N::NegInt(i as i64)
|
|
} else {
|
|
N::PosInt(i as u64)
|
|
}
|
|
}
|
|
#[cfg(feature = "arbitrary_precision")]
|
|
{
|
|
itoa::Buffer::new().format(i).to_owned()
|
|
}
|
|
};
|
|
Number { n: n }
|
|
}
|
|
}
|
|
)*
|
|
};
|
|
}
|
|
|
|
impl_from_unsigned!(u8, u16, u32, u64, usize);
|
|
impl_from_signed!(i8, i16, i32, i64, isize);
|
|
|
|
#[cfg(feature = "arbitrary_precision")]
|
|
serde_if_integer128! {
|
|
impl From<i128> for Number {
|
|
fn from(i: i128) -> Self {
|
|
Number { n: i.to_string() }
|
|
}
|
|
}
|
|
|
|
impl From<u128> for Number {
|
|
fn from(u: u128) -> Self {
|
|
Number { n: u.to_string() }
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Number {
|
|
#[cfg(not(feature = "arbitrary_precision"))]
|
|
// Not public API. Should be pub(crate).
|
|
#[doc(hidden)]
|
|
#[cold]
|
|
pub fn unexpected(&self) -> Unexpected {
|
|
match self.n {
|
|
N::PosInt(u) => Unexpected::Unsigned(u),
|
|
N::NegInt(i) => Unexpected::Signed(i),
|
|
N::Float(f) => Unexpected::Float(f),
|
|
}
|
|
}
|
|
|
|
#[cfg(feature = "arbitrary_precision")]
|
|
// Not public API. Should be pub(crate).
|
|
#[doc(hidden)]
|
|
#[cold]
|
|
pub fn unexpected(&self) -> Unexpected {
|
|
Unexpected::Other("number")
|
|
}
|
|
}
|