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use crate::{
environment::lexical_environment::VariableScope,
exec::Executable,
gc::{Finalize, Trace},
syntax::ast::node::Node,
BoaProfiler, Context, JsResult, JsValue,
};
use std::fmt;
#[cfg(feature = "deser")]
use serde::{Deserialize, Serialize};
#[cfg_attr(feature = "deser", derive(Serialize, Deserialize))]
#[derive(Clone, Debug, Trace, Finalize, PartialEq)]
pub struct Assign {
lhs: Box<Node>,
rhs: Box<Node>,
}
impl Assign {
pub(in crate::syntax) fn new<L, R>(lhs: L, rhs: R) -> Self
where
L: Into<Node>,
R: Into<Node>,
{
Self {
lhs: Box::new(lhs.into()),
rhs: Box::new(rhs.into()),
}
}
pub fn lhs(&self) -> &Node {
&self.lhs
}
pub fn rhs(&self) -> &Node {
&self.rhs
}
}
impl Executable for Assign {
fn run(&self, context: &mut Context) -> JsResult<JsValue> {
let _timer = BoaProfiler::global().start_event("Assign", "exec");
let val = self.rhs().run(context)?;
match self.lhs() {
Node::Identifier(ref name) => {
if context.has_binding(name.as_ref())? {
context.set_mutable_binding(name.as_ref(), val.clone(), context.strict())?;
} else {
context.create_mutable_binding(name.as_ref(), true, VariableScope::Function)?;
context.initialize_binding(name.as_ref(), val.clone())?;
}
}
Node::GetConstField(ref get_const_field) => {
let val_obj = get_const_field.obj().run(context)?;
val_obj.set_field(get_const_field.field(), val.clone(), false, context)?;
}
Node::GetField(ref get_field) => {
let object = get_field.obj().run(context)?;
let field = get_field.field().run(context)?;
let key = field.to_property_key(context)?;
object.set_field(key, val.clone(), false, context)?;
}
_ => (),
}
Ok(val)
}
}
impl fmt::Display for Assign {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{} = {}", self.lhs, self.rhs)
}
}
impl From<Assign> for Node {
fn from(op: Assign) -> Self {
Self::Assign(op)
}
}