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

//! Declaration execution.

use super::{Executable, Interpreter};
use crate::{
    builtins::{
        function::ThisMode,
        value::{ResultValue, Value},
    },
    environment::lexical_environment::VariableScope,
    syntax::ast::node::{
        ArrowFunctionDecl, ConstDeclList, FunctionDecl, FunctionExpr, LetDeclList, VarDeclList,
    },
    BoaProfiler,
};

impl Executable for FunctionDecl {
    fn run(&self, interpreter: &mut Interpreter) -> ResultValue {
        let _timer = BoaProfiler::global().start_event("FunctionDecl", "exec");
        let val = interpreter.create_function(
            self.parameters().to_vec(),
            self.body().to_vec(),
            ThisMode::NonLexical,
            true,
            true,
        );

        // Set the name and assign it in the current environment
        val.set_field("name", self.name());
        interpreter.realm_mut().environment.create_mutable_binding(
            self.name().to_owned(),
            false,
            VariableScope::Function,
        );

        interpreter
            .realm_mut()
            .environment
            .initialize_binding(self.name(), val);

        Ok(Value::undefined())
    }
}

impl Executable for FunctionExpr {
    fn run(&self, interpreter: &mut Interpreter) -> ResultValue {
        let val = interpreter.create_function(
            self.parameters().to_vec(),
            self.body().to_vec(),
            ThisMode::NonLexical,
            true,
            true,
        );

        if let Some(name) = self.name() {
            val.set_field("name", Value::from(name));
        }

        Ok(val)
    }
}

impl Executable for VarDeclList {
    fn run(&self, interpreter: &mut Interpreter) -> ResultValue {
        for var in self.as_ref() {
            let val = match var.init() {
                Some(v) => v.run(interpreter)?,
                None => Value::undefined(),
            };
            let environment = &mut interpreter.realm_mut().environment;

            if environment.has_binding(var.name()) {
                if var.init().is_some() {
                    environment.set_mutable_binding(var.name(), val, true);
                }
            } else {
                environment.create_mutable_binding(
                    var.name().to_owned(),
                    false,
                    VariableScope::Function,
                );
                environment.initialize_binding(var.name(), val);
            }
        }
        Ok(Value::undefined())
    }
}

impl Executable for ConstDeclList {
    fn run(&self, interpreter: &mut Interpreter) -> ResultValue {
        for decl in self.as_ref() {
            let val = decl.init().run(interpreter)?;

            interpreter
                .realm_mut()
                .environment
                .create_immutable_binding(decl.name().to_owned(), false, VariableScope::Block);

            interpreter
                .realm_mut()
                .environment
                .initialize_binding(decl.name(), val);
        }
        Ok(Value::undefined())
    }
}

impl Executable for LetDeclList {
    fn run(&self, interpreter: &mut Interpreter) -> ResultValue {
        for var in self.as_ref() {
            let val = match var.init() {
                Some(v) => v.run(interpreter)?,
                None => Value::undefined(),
            };
            interpreter.realm_mut().environment.create_mutable_binding(
                var.name().to_owned(),
                false,
                VariableScope::Block,
            );
            interpreter
                .realm_mut()
                .environment
                .initialize_binding(var.name(), val);
        }
        Ok(Value::undefined())
    }
}

impl Executable for ArrowFunctionDecl {
    fn run(&self, interpreter: &mut Interpreter) -> ResultValue {
        Ok(interpreter.create_function(
            self.params().to_vec(),
            self.body().to_vec(),
            ThisMode::Lexical,
            false,
            true,
        ))
    }
}