boa_engine 0.19.1

Boa is a Javascript lexer, parser and 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

use crate::{
    object::JsRegExp,
    vm::{opcode::Operation, CompletionType, Constant},
    Context, JsResult, JsValue,
};

/// `PushLiteral` implements the Opcode Operation for `Opcode::PushLiteral`
///
/// Operation:
///  - Push literal value on the stack.
#[derive(Debug, Clone, Copy)]
pub(crate) struct PushLiteral;

impl PushLiteral {
    #[allow(clippy::unnecessary_wraps)]
    fn operation(context: &mut Context, index: usize) -> JsResult<CompletionType> {
        let constant = &context.vm.frame().code_block().constants[index];
        let value: JsValue = match constant {
            Constant::BigInt(v) => v.clone().into(),
            Constant::String(v) => v.clone().into(),
            _ => unreachable!("constant should be a string or bigint"),
        };
        context.vm.push(value);
        Ok(CompletionType::Normal)
    }
}

impl Operation for PushLiteral {
    const NAME: &'static str = "PushLiteral";
    const INSTRUCTION: &'static str = "INST - PushLiteral";
    const COST: u8 = 1;

    fn execute(context: &mut Context) -> JsResult<CompletionType> {
        let index = context.vm.read::<u8>() as usize;
        Self::operation(context, index)
    }

    fn execute_with_u16_operands(context: &mut Context) -> JsResult<CompletionType> {
        let index = context.vm.read::<u16>() as usize;
        Self::operation(context, index)
    }

    fn execute_with_u32_operands(context: &mut Context) -> JsResult<CompletionType> {
        let index = context.vm.read::<u32>() as usize;
        Self::operation(context, index)
    }
}

/// `PushRegExp` implements the Opcode Operation for `Opcode::PushRegExp`
///
/// Operation:
///  - Push regexp value on the stack.
#[derive(Debug, Clone, Copy)]
pub(crate) struct PushRegExp;

impl PushRegExp {
    fn operation(
        context: &mut Context,
        pattern_index: usize,
        flags_index: usize,
    ) -> JsResult<CompletionType> {
        let code_block = context.vm.frame().code_block();
        let pattern = code_block.constant_string(pattern_index);
        let flags = code_block.constant_string(flags_index);

        let regexp = JsRegExp::new(pattern, flags, context)?;
        context.vm.push(regexp);
        Ok(CompletionType::Normal)
    }
}

impl Operation for PushRegExp {
    const NAME: &'static str = "PushRegExp";
    const INSTRUCTION: &'static str = "INST - PushRegExp";
    const COST: u8 = 5;

    fn execute(context: &mut Context) -> JsResult<CompletionType> {
        let pattern_index = context.vm.read::<u8>() as usize;
        let flags_index = context.vm.read::<u8>() as usize;
        Self::operation(context, pattern_index, flags_index)
    }

    fn execute_with_u16_operands(context: &mut Context) -> JsResult<CompletionType> {
        let pattern_index = context.vm.read::<u16>() as usize;
        let flags_index = context.vm.read::<u16>() as usize;
        Self::operation(context, pattern_index, flags_index)
    }

    fn execute_with_u32_operands(context: &mut Context) -> JsResult<CompletionType> {
        let pattern_index = context.vm.read::<u32>() as usize;
        let flags_index = context.vm.read::<u32>() as usize;
        Self::operation(context, pattern_index, flags_index)
    }
}