Boa 0.3.0

Boa is a Javascript lexer, parser and Just-in-Time compiler written in Rust. Currently, it has support for some of the language.
Documentation 
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

use crate::{
    exec::Interpreter,
    js::{
        function::NativeFunctionData,
        value::{from_value, to_value, ResultValue, Value, ValueData},
    },
};
use rand::random;
use std::f64;

/// Get the absolute value of a number
pub fn abs(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .abs()
    }))
}
/// Get the arccos of a number
pub fn acos(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .acos()
    }))
}
/// Get the arcsine of a number
pub fn asin(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .asin()
    }))
}
/// Get the arctangent of a number
pub fn atan(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .atan()
    }))
}
/// Get the arctangent of a numbers
pub fn atan2(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .atan2(args.get(1).unwrap().to_num())
    }))
}
/// Get the cubic root of a number
pub fn cbrt(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .cbrt()
    }))
}
/// Get lowest integer above a number
pub fn ceil(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .ceil()
    }))
}
/// Get the cosine of a number
pub fn cos(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .cos()
    }))
}
/// Get the power to raise the natural logarithm to get the number
pub fn exp(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .exp()
    }))
}
/// Get the highest integer below a number
pub fn floor(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .floor()
    }))
}
/// Get the natural logarithm of a number
pub fn log(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .log(f64::consts::E)
    }))
}
/// Get the maximum of several numbers
pub fn max(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    let mut max = f64::NEG_INFINITY;
    for arg in args {
        let num = arg.to_num();
        max = max.max(num);
    }
    Ok(to_value(max))
}
/// Get the minimum of several numbers
pub fn min(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    let mut max = f64::INFINITY;
    for arg in args {
        let num = arg.to_num();
        max = max.min(num);
    }
    Ok(to_value(max))
}
/// Raise a number to a power
pub fn pow(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.len() >= 2 {
        let num: f64 = from_value(args.get(0).unwrap().clone()).unwrap();
        let power: f64 = from_value(args.get(1).unwrap().clone()).unwrap();
        num.powf(power)
    } else {
        f64::NAN
    }))
}
/// Generate a random floating-point number between 0 and 1
pub fn _random(_: &Value, _: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(random::<f64>()))
}
/// Round a number to the nearest integer
pub fn round(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .round()
    }))
}
/// Get the sine of a number
pub fn sin(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .sin()
    }))
}
/// Get the square root of a number
pub fn sqrt(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .sqrt()
    }))
}
/// Get the tangent of a number
pub fn tan(_: &Value, args: &[Value], _: &Interpreter) -> ResultValue {
    Ok(to_value(if args.is_empty() {
        f64::NAN
    } else {
        from_value::<f64>(args.get(0).unwrap().clone())
            .unwrap()
            .tan()
    }))
}
/// Create a new `Math` object
pub fn _create(global: &Value) -> Value {
    let math = ValueData::new_obj(Some(global));
    math.set_field_slice("E", to_value(f64::consts::E));
    math.set_field_slice("LN2", to_value(f64::consts::LN_2));
    math.set_field_slice("LN10", to_value(f64::consts::LN_10));
    math.set_field_slice("LOG2E", to_value(f64::consts::LOG2_E));
    math.set_field_slice("LOG10E", to_value(f64::consts::LOG10_E));
    math.set_field_slice("SQRT1_2", to_value(0.5_f64.sqrt()));
    math.set_field_slice("SQRT2", to_value(f64::consts::SQRT_2));
    math.set_field_slice("PI", to_value(f64::consts::PI));
    math.set_field_slice("abs", to_value(abs as NativeFunctionData));
    math.set_field_slice("acos", to_value(acos as NativeFunctionData));
    math.set_field_slice("asin", to_value(asin as NativeFunctionData));
    math.set_field_slice("atan", to_value(atan as NativeFunctionData));
    math.set_field_slice("atan2", to_value(atan2 as NativeFunctionData));
    math.set_field_slice("cbrt", to_value(cbrt as NativeFunctionData));
    math.set_field_slice("ceil", to_value(ceil as NativeFunctionData));
    math.set_field_slice("cos", to_value(cos as NativeFunctionData));
    math.set_field_slice("exp", to_value(exp as NativeFunctionData));
    math.set_field_slice("floor", to_value(floor as NativeFunctionData));
    math.set_field_slice("log", to_value(log as NativeFunctionData));
    math.set_field_slice("max", to_value(max as NativeFunctionData));
    math.set_field_slice("min", to_value(min as NativeFunctionData));
    math.set_field_slice("pow", to_value(pow as NativeFunctionData));
    math.set_field_slice("random", to_value(_random as NativeFunctionData));
    math.set_field_slice("round", to_value(round as NativeFunctionData));
    math.set_field_slice("sin", to_value(sin as NativeFunctionData));
    math.set_field_slice("sqrt", to_value(sqrt as NativeFunctionData));
    math.set_field_slice("tan", to_value(tan as NativeFunctionData));
    math
}
/// Initialise the `Math` object on the global object
pub fn init(global: &Value) {
    global.set_field_slice("Math", _create(global));
}