1use super::Value;
2use crate::map::Map;
3use crate::number::Number;
4use alloc::borrow::Cow;
5use alloc::string::{String, ToString};
6use alloc::vec::Vec;
7
8macro_rules! from_integer {
9 ($($ty:ident)*) => {
10 $(
11 impl From<$ty> for Value {
12 fn from(n: $ty) -> Self {
13 Value::Number(n.into())
14 }
15 }
16 )*
17 };
18}
19
20from_integer! {
21 i8 i16 i32 i64 isize
22 u8 u16 u32 u64 usize
23}
24
25#[cfg(feature = "arbitrary_precision")]
26from_integer! {
27 i128 u128
28}
29
30impl From<f32> for Value {
31 /// Convert 32-bit floating point number to `Value::Number`, or
32 /// `Value::Null` if infinite or NaN.
33 ///
34 /// # Examples
35 ///
36 /// ```
37 /// use serde_json::Value;
38 ///
39 /// let f: f32 = 13.37;
40 /// let x: Value = f.into();
41 /// ```
42 fn from(f: f32) -> Self {
43 Number::from_f32(f).map_or(default:Value::Null, f:Value::Number)
44 }
45}
46
47impl From<f64> for Value {
48 /// Convert 64-bit floating point number to `Value::Number`, or
49 /// `Value::Null` if infinite or NaN.
50 ///
51 /// # Examples
52 ///
53 /// ```
54 /// use serde_json::Value;
55 ///
56 /// let f: f64 = 13.37;
57 /// let x: Value = f.into();
58 /// ```
59 fn from(f: f64) -> Self {
60 Number::from_f64(f).map_or(default:Value::Null, f:Value::Number)
61 }
62}
63
64impl From<bool> for Value {
65 /// Convert boolean to `Value::Bool`.
66 ///
67 /// # Examples
68 ///
69 /// ```
70 /// use serde_json::Value;
71 ///
72 /// let b = false;
73 /// let x: Value = b.into();
74 /// ```
75 fn from(f: bool) -> Self {
76 Value::Bool(f)
77 }
78}
79
80impl From<String> for Value {
81 /// Convert `String` to `Value::String`.
82 ///
83 /// # Examples
84 ///
85 /// ```
86 /// use serde_json::Value;
87 ///
88 /// let s: String = "lorem".to_string();
89 /// let x: Value = s.into();
90 /// ```
91 fn from(f: String) -> Self {
92 Value::String(f)
93 }
94}
95
96impl From<&str> for Value {
97 /// Convert string slice to `Value::String`.
98 ///
99 /// # Examples
100 ///
101 /// ```
102 /// use serde_json::Value;
103 ///
104 /// let s: &str = "lorem";
105 /// let x: Value = s.into();
106 /// ```
107 fn from(f: &str) -> Self {
108 Value::String(f.to_string())
109 }
110}
111
112impl<'a> From<Cow<'a, str>> for Value {
113 /// Convert copy-on-write string to `Value::String`.
114 ///
115 /// # Examples
116 ///
117 /// ```
118 /// use serde_json::Value;
119 /// use std::borrow::Cow;
120 ///
121 /// let s: Cow<str> = Cow::Borrowed("lorem");
122 /// let x: Value = s.into();
123 /// ```
124 ///
125 /// ```
126 /// use serde_json::Value;
127 /// use std::borrow::Cow;
128 ///
129 /// let s: Cow<str> = Cow::Owned("lorem".to_string());
130 /// let x: Value = s.into();
131 /// ```
132 fn from(f: Cow<'a, str>) -> Self {
133 Value::String(f.into_owned())
134 }
135}
136
137impl From<Number> for Value {
138 /// Convert `Number` to `Value::Number`.
139 ///
140 /// # Examples
141 ///
142 /// ```
143 /// use serde_json::{Number, Value};
144 ///
145 /// let n = Number::from(7);
146 /// let x: Value = n.into();
147 /// ```
148 fn from(f: Number) -> Self {
149 Value::Number(f)
150 }
151}
152
153impl From<Map<String, Value>> for Value {
154 /// Convert map (with string keys) to `Value::Object`.
155 ///
156 /// # Examples
157 ///
158 /// ```
159 /// use serde_json::{Map, Value};
160 ///
161 /// let mut m = Map::new();
162 /// m.insert("Lorem".to_string(), "ipsum".into());
163 /// let x: Value = m.into();
164 /// ```
165 fn from(f: Map<String, Value>) -> Self {
166 Value::Object(f)
167 }
168}
169
170impl<T: Into<Value>> From<Vec<T>> for Value {
171 /// Convert a `Vec` to `Value::Array`.
172 ///
173 /// # Examples
174 ///
175 /// ```
176 /// use serde_json::Value;
177 ///
178 /// let v = vec!["lorem", "ipsum", "dolor"];
179 /// let x: Value = v.into();
180 /// ```
181 fn from(f: Vec<T>) -> Self {
182 Value::Array(f.into_iter().map(Into::into).collect())
183 }
184}
185
186impl<T: Clone + Into<Value>> From<&[T]> for Value {
187 /// Convert a slice to `Value::Array`.
188 ///
189 /// # Examples
190 ///
191 /// ```
192 /// use serde_json::Value;
193 ///
194 /// let v: &[&str] = &["lorem", "ipsum", "dolor"];
195 /// let x: Value = v.into();
196 /// ```
197 fn from(f: &[T]) -> Self {
198 Value::Array(f.iter().cloned().map(Into::into).collect())
199 }
200}
201
202impl<T: Into<Value>> FromIterator<T> for Value {
203 /// Create a `Value::Array` by collecting an iterator of array elements.
204 ///
205 /// # Examples
206 ///
207 /// ```
208 /// use serde_json::Value;
209 ///
210 /// let v = std::iter::repeat(42).take(5);
211 /// let x: Value = v.collect();
212 /// ```
213 ///
214 /// ```
215 /// use serde_json::Value;
216 ///
217 /// let v: Vec<_> = vec!["lorem", "ipsum", "dolor"];
218 /// let x: Value = v.into_iter().collect();
219 /// ```
220 ///
221 /// ```
222 /// use std::iter::FromIterator;
223 /// use serde_json::Value;
224 ///
225 /// let x: Value = Value::from_iter(vec!["lorem", "ipsum", "dolor"]);
226 /// ```
227 fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self {
228 Value::Array(iter.into_iter().map(Into::into).collect())
229 }
230}
231
232impl<K: Into<String>, V: Into<Value>> FromIterator<(K, V)> for Value {
233 /// Create a `Value::Object` by collecting an iterator of key-value pairs.
234 ///
235 /// # Examples
236 ///
237 /// ```
238 /// use serde_json::Value;
239 ///
240 /// let v: Vec<_> = vec![("lorem", 40), ("ipsum", 2)];
241 /// let x: Value = v.into_iter().collect();
242 /// ```
243 fn from_iter<I: IntoIterator<Item = (K, V)>>(iter: I) -> Self {
244 Value::Object(
245 iterimpl Iterator.into_iter()
246 .map(|(k: K, v: V)| (k.into(), v.into()))
247 .collect(),
248 )
249 }
250}
251
252impl From<()> for Value {
253 /// Convert `()` to `Value::Null`.
254 ///
255 /// # Examples
256 ///
257 /// ```
258 /// use serde_json::Value;
259 ///
260 /// let u = ();
261 /// let x: Value = u.into();
262 /// ```
263 fn from((): ()) -> Self {
264 Value::Null
265 }
266}
267
268impl<T> From<Option<T>> for Value
269where
270 T: Into<Value>,
271{
272 fn from(opt: Option<T>) -> Self {
273 match opt {
274 None => Value::Null,
275 Some(value: T) => Into::into(self:value),
276 }
277 }
278}
279