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use super::Value;
use crate::map::Map;
use crate::number::Number;
use alloc::borrow::Cow;
use alloc::string::{String, ToString};
use alloc::vec::Vec;
macro_rules! from_integer {
($($ty:ident)*) => {
$(
impl From<$ty> for Value {
fn from(n: $ty) -> Self {
Value::Number(n.into())
}
}
)*
};
}
from_integer! {
i8 i16 i32 i64 isize
u8 u16 u32 u64 usize
}
#[cfg(feature = "arbitrary_precision")]
from_integer! {
i128 u128
}
impl From<f32> for Value {
/// Convert 32-bit floating point number to `Value::Number`, or
/// `Value::Null` if infinite or NaN.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
///
/// let f: f32 = 13.37;
/// let x: Value = f.into();
/// ```
fn from(f: f32) -> Self {
Number::from_f32(f).map_or(Value::Null, Value::Number)
}
}
impl From<f64> for Value {
/// Convert 64-bit floating point number to `Value::Number`, or
/// `Value::Null` if infinite or NaN.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
///
/// let f: f64 = 13.37;
/// let x: Value = f.into();
/// ```
fn from(f: f64) -> Self {
Number::from_f64(f).map_or(Value::Null, Value::Number)
}
}
impl From<bool> for Value {
/// Convert boolean to `Value::Bool`.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
///
/// let b = false;
/// let x: Value = b.into();
/// ```
fn from(f: bool) -> Self {
Value::Bool(f)
}
}
impl From<String> for Value {
/// Convert `String` to `Value::String`.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
///
/// let s: String = "lorem".to_string();
/// let x: Value = s.into();
/// ```
fn from(f: String) -> Self {
Value::String(f)
}
}
impl From<&str> for Value {
/// Convert string slice to `Value::String`.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
///
/// let s: &str = "lorem";
/// let x: Value = s.into();
/// ```
fn from(f: &str) -> Self {
Value::String(f.to_string())
}
}
impl<'a> From<Cow<'a, str>> for Value {
/// Convert copy-on-write string to `Value::String`.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
/// use std::borrow::Cow;
///
/// let s: Cow<str> = Cow::Borrowed("lorem");
/// let x: Value = s.into();
/// ```
///
/// ```
/// use serde_json::Value;
/// use std::borrow::Cow;
///
/// let s: Cow<str> = Cow::Owned("lorem".to_string());
/// let x: Value = s.into();
/// ```
fn from(f: Cow<'a, str>) -> Self {
Value::String(f.into_owned())
}
}
impl From<Number> for Value {
/// Convert `Number` to `Value::Number`.
///
/// # Examples
///
/// ```
/// use serde_json::{Number, Value};
///
/// let n = Number::from(7);
/// let x: Value = n.into();
/// ```
fn from(f: Number) -> Self {
Value::Number(f)
}
}
impl From<Map<String, Value>> for Value {
/// Convert map (with string keys) to `Value::Object`.
///
/// # Examples
///
/// ```
/// use serde_json::{Map, Value};
///
/// let mut m = Map::new();
/// m.insert("Lorem".to_string(), "ipsum".into());
/// let x: Value = m.into();
/// ```
fn from(f: Map<String, Value>) -> Self {
Value::Object(f)
}
}
impl<T: Into<Value>> From<Vec<T>> for Value {
/// Convert a `Vec` to `Value::Array`.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
///
/// let v = vec!["lorem", "ipsum", "dolor"];
/// let x: Value = v.into();
/// ```
fn from(f: Vec<T>) -> Self {
Value::Array(f.into_iter().map(Into::into).collect())
}
}
impl<T: Clone + Into<Value>> From<&[T]> for Value {
/// Convert a slice to `Value::Array`.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
///
/// let v: &[&str] = &["lorem", "ipsum", "dolor"];
/// let x: Value = v.into();
/// ```
fn from(f: &[T]) -> Self {
Value::Array(f.iter().cloned().map(Into::into).collect())
}
}
impl<T: Into<Value>> FromIterator<T> for Value {
/// Create a `Value::Array` by collecting an iterator of array elements.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
///
/// let v = std::iter::repeat(42).take(5);
/// let x: Value = v.collect();
/// ```
///
/// ```
/// use serde_json::Value;
///
/// let v: Vec<_> = vec!["lorem", "ipsum", "dolor"];
/// let x: Value = v.into_iter().collect();
/// ```
///
/// ```
/// use std::iter::FromIterator;
/// use serde_json::Value;
///
/// let x: Value = Value::from_iter(vec!["lorem", "ipsum", "dolor"]);
/// ```
fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self {
Value::Array(iter.into_iter().map(Into::into).collect())
}
}
impl<K: Into<String>, V: Into<Value>> FromIterator<(K, V)> for Value {
/// Create a `Value::Object` by collecting an iterator of key-value pairs.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
///
/// let v: Vec<_> = vec![("lorem", 40), ("ipsum", 2)];
/// let x: Value = v.into_iter().collect();
/// ```
fn from_iter<I: IntoIterator<Item = (K, V)>>(iter: I) -> Self {
Value::Object(
iter.into_iter()
.map(|(k, v)| (k.into(), v.into()))
.collect(),
)
}
}
impl From<()> for Value {
/// Convert `()` to `Value::Null`.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
///
/// let u = ();
/// let x: Value = u.into();
/// ```
fn from((): ()) -> Self {
Value::Null
}
}
impl<T> From<Option<T>> for Value
where
T: Into<Value>,
{
fn from(opt: Option<T>) -> Self {
match opt {
None => Value::Null,
Some(value) => Into::into(value),
}
}
}