Ensure Unicode escapes can't be used in character classes yet

peggyjs · Jun 22, 2022 · 879eb7a · 879eb7a
1 parent 72d308c
commit 879eb7a
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Showing 2 changed files with 85 additions and 40 deletions.
diff --git a/lib/parser.js b/lib/parser.js
diff --git a/src/parser.pegjs b/src/parser.pegjs
@@ -286,6 +286,7 @@ IdentifierStart
   / "$"
   / "_"
   / "\\" @UnicodeEscapeSequence
+  / "\\" @ExtendedUnicodeEscapeSequence
 
 IdentifierPart
   = IdentifierStart
@@ -329,12 +330,12 @@ StringLiteral "string"
 
 DoubleStringCharacter
   = $(!('"' / "\\" / LineTerminator) SourceCharacter)
-  / "\\" @EscapeSequence
+  / "\\" @ExtendedEscapeSequence
   / LineContinuation
 
 SingleStringCharacter
   = $(!("'" / "\\" / LineTerminator) SourceCharacter)
-  / "\\" @EscapeSequence
+  / "\\" @ExtendedEscapeSequence
   / LineContinuation
 
 CharacterClassMatcher "character class"
@@ -372,6 +373,10 @@ ClassCharacter
 LineContinuation
   = "\\" LineTerminatorSequence { return ""; }
 
+ExtendedEscapeSequence
+  = EscapeSequence
+  / ExtendedUnicodeEscapeSequence
+
 EscapeSequence
   = CharacterEscapeSequence
   / "0" !DecimalDigit { return "\0"; }
@@ -411,7 +416,9 @@ UnicodeEscapeSequence
   = "u" digits:$(HexDigit HexDigit HexDigit HexDigit) {
       return String.fromCharCode(parseInt(digits, 16));
     }
-  / "u{" digits:$HexDigit+ "}" {
+
+ExtendedUnicodeEscapeSequence
+  = "u{" digits:$HexDigit+ "}" {
     // String.fromCodePoint() is not supported in IE11.
     let codepoint = parseInt(digits, 16);
     if (codepoint > 0x10FFFF) {