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use crate::util::ExprFactory;
use swc_atoms::JsWord;
use swc_common::DUMMY_SP;
use swc_ecma_ast::*;
use swc_ecma_visit::{noop_fold_type, Fold, FoldWith};
pub fn sticky_regex() -> impl 'static + Fold {
StickyRegex
}
#[derive(Clone, Copy)]
struct StickyRegex;
impl Fold for StickyRegex {
noop_fold_type!();
fn fold_expr(&mut self, e: Expr) -> Expr {
let e = e.fold_children_with(self);
match e {
Expr::Lit(Lit::Regex(Regex { exp, flags, span })) => {
if flags.contains('y') {
let str_lit = |s: JsWord| {
Box::new(Expr::Lit(Lit::Str(Str {
span: DUMMY_SP,
value: s,
has_escape: false,
})))
};
Expr::New(NewExpr {
span,
callee: Box::new(quote_ident!(span, "RegExp").into()),
args: Some(vec![str_lit(exp).as_arg(), str_lit(flags).as_arg()]),
type_args: Default::default(),
})
} else {
Expr::Lit(Lit::Regex(Regex { exp, flags, span }))
}
}
_ => e,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
test!(
::swc_ecma_parser::Syntax::default(),
|_| StickyRegex,
babel_basic,
"var re = /o+/y;",
"var re = new RegExp('o+', 'y');"
);
test!(
::swc_ecma_parser::Syntax::default(),
|_| StickyRegex,
babel_ignore_non_sticky,
"var re = /o+/;",
"var re = /o+/;"
);
}