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#[cfg(feature = "verify")]
use swc_common::{Span, Spanned};
#[cfg(feature = "verify")]
use swc_ecma_visit::{noop_visit_type, Visit, VisitWith};

use super::*;

impl<I: Tokens> Parser<I> {
    #[cfg(feature = "verify")]
    pub(in crate::parser) fn verify_expr(&mut self, expr: Box<Expr>) -> PResult<Box<Expr>> {
        let mut v = Verifier { errors: vec![] };

        v.visit_expr(&expr);

        for (span, error) in v.errors {
            self.emit_err(span, error);
        }

        return Ok(expr);
    }

    #[cfg(not(feature = "verify"))]
    pub(in crate::parser) fn verify_expr(&mut self, expr: Box<Expr>) -> PResult<Box<Expr>> {
        Ok(expr)
    }
}

#[cfg(feature = "verify")]
pub(super) struct Verifier {
    pub errors: Vec<(Span, SyntaxError)>,
}

#[cfg(feature = "verify")]
impl Visit for Verifier {
    noop_visit_type!();

    fn visit_assign_prop(&mut self, p: &AssignProp) {
        self.errors.push((p.span(), SyntaxError::AssignProperty));
    }

    fn visit_expr(&mut self, e: &Expr) {
        match *e {
            Expr::Fn(..) | Expr::Arrow(..) => {}
            _ => e.visit_children_with(self),
        }
    }
}