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use crate::util::ExprFactory;
use swc_common::{Fold, FoldWith, Visit, VisitWith};
use swc_ecma_ast::*;
#[derive(Clone)]
pub struct InstanceOf;
noop_fold_type!(InstanceOf);
impl Fold<Expr> for InstanceOf {
fn fold(&mut self, expr: Expr) -> Expr {
fn should_work(node: &Expr) -> bool {
struct Visitor {
found: bool,
}
impl Visit<BinExpr> for Visitor {
fn visit(&mut self, e: &BinExpr) {
if e.op == op!("instanceof") {
self.found = true
}
}
}
let mut v = Visitor { found: false };
node.visit_with(&mut v);
v.found
}
if !should_work(&expr) {
return expr;
}
let expr = expr.fold_children(self);
match expr {
Expr::Bin(BinExpr {
span,
left,
op: op!("instanceof"),
right,
}) => Expr::Call(CallExpr {
span,
callee: helper!(span, instanceof, "instanceof"),
args: vec![left.as_arg(), right.as_arg()],
type_args: Default::default(),
}),
_ => expr,
}
}
}