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use crate::{
builtins::function::FunctionFlags,
exec::Executable,
gc::{Finalize, Trace},
syntax::ast::node::{join_nodes, FormalParameter, Node, StatementList},
Context, Result, Value,
};
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 FunctionExpr {
name: Option<Box<str>>,
parameters: Box<[FormalParameter]>,
body: StatementList,
}
impl FunctionExpr {
pub(in crate::syntax) fn new<N, P, B>(name: N, parameters: P, body: B) -> Self
where
N: Into<Option<Box<str>>>,
P: Into<Box<[FormalParameter]>>,
B: Into<StatementList>,
{
Self {
name: name.into(),
parameters: parameters.into(),
body: body.into(),
}
}
pub fn name(&self) -> Option<&str> {
self.name.as_ref().map(Box::as_ref)
}
pub fn parameters(&self) -> &[FormalParameter] {
&self.parameters
}
pub fn body(&self) -> &[Node] {
self.body.items()
}
pub(in crate::syntax::ast::node) fn display(
&self,
f: &mut fmt::Formatter<'_>,
indentation: usize,
) -> fmt::Result {
f.write_str("function")?;
if let Some(ref name) = self.name {
write!(f, " {}", name)?;
}
f.write_str("(")?;
join_nodes(f, &self.parameters)?;
f.write_str(") {{")?;
self.body.display(f, indentation + 1)?;
writeln!(f, "}}")
}
}
impl Executable for FunctionExpr {
fn run(&self, context: &mut Context) -> Result<Value> {
let val = context.create_function(
self.parameters().to_vec(),
self.body().to_vec(),
FunctionFlags::CALLABLE | FunctionFlags::CONSTRUCTABLE,
)?;
if let Some(name) = self.name() {
val.set_field("name", Value::from(name), context)?;
}
Ok(val)
}
}
impl fmt::Display for FunctionExpr {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.display(f, 0)
}
}
impl From<FunctionExpr> for Node {
fn from(expr: FunctionExpr) -> Self {
Self::FunctionExpr(expr)
}
}