add extend grammar grammar

Author: CppCXY

LuaParser/src/Lexer/LuaLexer.cpp

@@ -345,11 +345,12 @@ LuaTokenKind LuaLexer::Lex() {
             case '{': {
                 // extend syntax see issue 119
                 _reader.SaveAndNext();
-                if (_reader.CheckNext1('@')){
+                if (_supportNonStandardSymbol && _reader.CheckNext1('@')) {
                     _reader.EatWhile([](char ch) { return lislalnum(ch); });
-                    if (_reader.CheckNext1('}')){
+                    if (_reader.CheckNext1('}')) {
                         return TK_NAME;
                     }
+                    return TK_ERR;
                 }
                 return '{';
             }
@@ -596,4 +597,3 @@ void LuaLexer::TokenError(std::string_view message, TextRange range) {
 void LuaLexer::SupportNonStandardSymbol() {
     _supportNonStandardSymbol = true;
 }
-

Test/src/Grammar_unitest.cpp

@@ -54,4 +54,7 @@ end
     EXPECT_FALSE(TestHelper::GetParser(R"(
 local t = 123/*1233*/
 )", true).HasError()) << "extend grammar c likely comment test fail";
+    EXPECT_FALSE(TestHelper::GetParser(R"(
+local t = {@abaa}
+)", true).HasError()) << "extend grammar issue 119 test fail";
 }