1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
//! This module implements the conversions from and into [`serde_json::Value`].
use super::JsValue;
use crate::{
builtins::Array,
error::JsNativeError,
object::JsObject,
property::{PropertyDescriptor, PropertyKey},
Context, JsResult,
};
use serde_json::{Map, Value};
impl JsValue {
/// Converts a [`serde_json::Value`] to a `JsValue`.
///
/// # Example
///
/// ```
/// use boa_engine::{Context, JsValue};
///
/// let data = r#"
/// {
/// "name": "John Doe",
/// "age": 43,
/// "phones": [
/// "+44 1234567",
/// "+44 2345678"
/// ]
/// }"#;
///
/// let json: serde_json::Value = serde_json::from_str(data).unwrap();
///
/// let mut context = Context::default();
/// let value = JsValue::from_json(&json, &mut context).unwrap();
/// #
/// # assert_eq!(json, value.to_json(&mut context).unwrap());
/// ```
pub fn from_json(json: &Value, context: &mut Context<'_>) -> JsResult<Self> {
/// Biggest possible integer, as i64.
const MAX_INT: i64 = i32::MAX as i64;
/// Smallest possible integer, as i64.
const MIN_INT: i64 = i32::MIN as i64;
match json {
Value::Null => Ok(Self::Null),
Value::Bool(b) => Ok(Self::Boolean(*b)),
Value::Number(num) => num
.as_i64()
.filter(|n| (MIN_INT..=MAX_INT).contains(n))
.map(|i| Self::Integer(i as i32))
.or_else(|| num.as_f64().map(Self::Rational))
.ok_or_else(|| {
JsNativeError::typ()
.with_message(format!("could not convert JSON number {num} to JsValue"))
.into()
}),
Value::String(string) => Ok(Self::from(string.as_str())),
Value::Array(vec) => {
let mut arr = Vec::with_capacity(vec.len());
for val in vec {
arr.push(Self::from_json(val, context)?);
}
Ok(Array::create_array_from_list(arr, context).into())
}
Value::Object(obj) => {
let js_obj = JsObject::with_object_proto(context.intrinsics());
for (key, value) in obj {
let property = PropertyDescriptor::builder()
.value(Self::from_json(value, context)?)
.writable(true)
.enumerable(true)
.configurable(true);
js_obj.borrow_mut().insert(key.clone(), property);
}
Ok(js_obj.into())
}
}
}
/// Converts the `JsValue` to a [`serde_json::Value`].
///
/// # Example
///
/// ```
/// use boa_engine::{Context, JsValue};
///
/// let data = r#"
/// {
/// "name": "John Doe",
/// "age": 43,
/// "phones": [
/// "+44 1234567",
/// "+44 2345678"
/// ]
/// }"#;
///
/// let json: serde_json::Value = serde_json::from_str(data).unwrap();
///
/// let mut context = Context::default();
/// let value = JsValue::from_json(&json, &mut context).unwrap();
///
/// let back_to_json = value.to_json(&mut context).unwrap();
/// #
/// # assert_eq!(json, back_to_json);
/// ```
///
/// # Panics
///
/// Panics if the `JsValue` is `Undefined`.
pub fn to_json(&self, context: &mut Context<'_>) -> JsResult<Value> {
match self {
Self::Null => Ok(Value::Null),
Self::Undefined => todo!("undefined to JSON"),
&Self::Boolean(b) => Ok(b.into()),
Self::String(string) => Ok(string.to_std_string_escaped().into()),
&Self::Rational(rat) => Ok(rat.into()),
&Self::Integer(int) => Ok(int.into()),
Self::BigInt(_bigint) => Err(JsNativeError::typ()
.with_message("cannot convert bigint to JSON")
.into()),
Self::Object(obj) => {
if obj.is_array() {
let len = obj.length_of_array_like(context)?;
let mut arr = Vec::with_capacity(len as usize);
let obj = obj.borrow();
for k in 0..len as u32 {
let val = obj.properties().get(&k.into()).map_or(Self::Null, |desc| {
desc.value().cloned().unwrap_or(Self::Null)
});
arr.push(val.to_json(context)?);
}
Ok(Value::Array(arr))
} else {
let mut map = Map::new();
for property_key in obj.borrow().properties().shape.keys() {
let key = match &property_key {
PropertyKey::String(string) => string.to_std_string_escaped(),
PropertyKey::Index(i) => i.to_string(),
PropertyKey::Symbol(_sym) => {
return Err(JsNativeError::typ()
.with_message("cannot convert Symbol to JSON")
.into())
}
};
let value = match obj
.borrow()
.properties()
.get(&property_key)
.and_then(|x| x.value().cloned())
{
Some(val) => val.to_json(context)?,
None => Value::Null,
};
map.insert(key, value);
}
Ok(Value::Object(map))
}
}
Self::Symbol(_sym) => Err(JsNativeError::typ()
.with_message("cannot convert Symbol to JSON")
.into()),
}
}
}
#[cfg(test)]
mod tests {
use indoc::indoc;
use serde_json::json;
use crate::object::JsArray;
use crate::{run_test_actions, TestAction};
use crate::{string::utf16, JsValue};
#[test]
fn json_conversions() {
const DATA: &str = indoc! {r#"
{
"name": "John Doe",
"age": 43,
"minor": false,
"adult": true,
"extra": {
"address": null
},
"phones": [
"+44 1234567",
-45,
{},
true
]
}
"#};
run_test_actions([TestAction::inspect_context(|ctx| {
let json: serde_json::Value = serde_json::from_str(DATA).unwrap();
assert!(json.is_object());
let value = JsValue::from_json(&json, ctx).unwrap();
let obj = value.as_object().unwrap();
assert_eq!(obj.get(utf16!("name"), ctx).unwrap(), "John Doe".into());
assert_eq!(obj.get(utf16!("age"), ctx).unwrap(), 43_i32.into());
assert_eq!(obj.get(utf16!("minor"), ctx).unwrap(), false.into());
assert_eq!(obj.get(utf16!("adult"), ctx).unwrap(), true.into());
{
let extra = obj.get(utf16!("extra"), ctx).unwrap();
let extra = extra.as_object().unwrap();
assert!(extra.get(utf16!("address"), ctx).unwrap().is_null());
}
{
let phones = obj.get(utf16!("phones"), ctx).unwrap();
let phones = phones.as_object().unwrap();
let arr = JsArray::from_object(phones.clone()).unwrap();
assert_eq!(arr.at(0, ctx).unwrap(), "+44 1234567".into());
assert_eq!(arr.at(1, ctx).unwrap(), JsValue::from(-45_i32));
assert!(arr.at(2, ctx).unwrap().is_object());
assert_eq!(arr.at(3, ctx).unwrap(), true.into());
}
assert_eq!(json, value.to_json(ctx).unwrap());
})]);
}
#[test]
fn integer_ops_to_json() {
run_test_actions([
TestAction::assert_with_op("1000000 + 500", |v, ctx| {
v.to_json(ctx).unwrap() == json!(1_000_500)
}),
TestAction::assert_with_op("1000000 - 500", |v, ctx| {
v.to_json(ctx).unwrap() == json!(999_500)
}),
TestAction::assert_with_op("1000000 * 500", |v, ctx| {
v.to_json(ctx).unwrap() == json!(500_000_000)
}),
TestAction::assert_with_op("1000000 / 500", |v, ctx| {
v.to_json(ctx).unwrap() == json!(2_000)
}),
TestAction::assert_with_op("233894 % 500", |v, ctx| {
v.to_json(ctx).unwrap() == json!(394)
}),
TestAction::assert_with_op("36 ** 5", |v, ctx| {
v.to_json(ctx).unwrap() == json!(60_466_176)
}),
]);
}
}