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use crate::{
exec::{Executable, InterpreterState},
gc::{Finalize, Trace},
syntax::ast::node::Node,
Context, JsResult, JsValue,
};
use std::fmt;
#[cfg(feature = "deser")]
use serde::{Deserialize, Serialize};
#[cfg(test)]
mod tests;
#[cfg_attr(feature = "deser", derive(Serialize, Deserialize))]
#[derive(Clone, Debug, Trace, Finalize, PartialEq)]
pub struct Return {
expr: Option<Box<Node>>,
label: Option<Box<str>>,
}
impl Return {
pub fn label(&self) -> Option<&str> {
self.label.as_ref().map(Box::as_ref)
}
pub fn expr(&self) -> Option<&Node> {
self.expr.as_ref().map(Box::as_ref)
}
pub fn new<E, OE, L>(expr: OE, label: L) -> Self
where
E: Into<Node>,
OE: Into<Option<E>>,
L: Into<Option<Box<str>>>,
{
Self {
expr: expr.into().map(E::into).map(Box::new),
label: label.into(),
}
}
}
impl Executable for Return {
fn run(&self, context: &mut Context) -> JsResult<JsValue> {
let result = match self.expr() {
Some(v) => v.run(context),
None => Ok(JsValue::undefined()),
};
context
.executor()
.set_current_state(InterpreterState::Return);
result
}
}
impl From<Return> for Node {
fn from(return_smt: Return) -> Node {
Node::Return(return_smt)
}
}
impl fmt::Display for Return {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self.expr() {
Some(ex) => write!(f, "return {}", ex),
None => write!(f, "return"),
}
}
}