Prevent with statement in strict mode

boa-dev · Sep 26, 2020 · 5fb2e64 · 5fb2e64
1 parent 0108b80
commit 5fb2e64
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/boa/src/syntax/lexer/identifier.rs b/boa/src/syntax/lexer/identifier.rs
@@ -4,7 +4,7 @@ use super::{Cursor, Error, Tokenizer};
 use crate::{
     profiler::BoaProfiler,
     syntax::{
-        ast::{Position, Span},
+        ast::{Keyword, Position, Span},
         lexer::{Token, TokenKind},
     },
 };
@@ -68,6 +68,12 @@ impl<R> Tokenizer<R> for Identifier {
             "null" => TokenKind::NullLiteral,
             slice => {
                 if let Ok(keyword) = slice.parse() {
+                    if strict_mode && keyword == Keyword::With {
+                        return Err(Error::Syntax(
+                            "using 'with' statement not allowed in strict mode".into(),
+                            start_pos,
+                        ));
+                    }
                     TokenKind::Keyword(keyword)
                 } else {
                     if strict_mode && STRICT_FORBIDDEN_IDENTIFIERS.contains(&slice) {