Unify paren handling in (Pre)Parser::ParseExpressionOrLabelledStatement.

src/ast.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 64 matching lines @@
   VariableProxy* var_proxy = AsVariableProxy();
   if (var_proxy == NULL) return false;
   Variable* var = var_proxy->var();
   // The global identifier "undefined" is immutable. Everything
   // else could be reassigned.
   return var != NULL && var->location() == Variable::UNALLOCATED &&
          var_proxy->name()->Equals(isolate->heap()->undefined_string());
 }
 
 
+bool Expression::IsIdentifier() {
+  return (AsVariableProxy() != NULL && !AsVariableProxy()->is_this());
+}
+
+
+bool Expression::IsIdentifierNamed(String* name) {
+  return (AsVariableProxy() != NULL && AsVariableProxy()->name()->Equals(name));
+}
+
+
 VariableProxy::VariableProxy(Zone* zone, Variable* var, int position)
     : Expression(zone, position),
       name_(var->name()),
       var_(NULL),  // Will be set by the call to BindTo.
       is_this_(var->is_this()),
       is_trivial_(false),
       is_lvalue_(false),
       interface_(var->interface()) {
   BindTo(var);
 }
@@ skipping 1055 matching lines @@
     OS::SNPrintF(buffer, "%d", Smi::cast(*value_)->value());
     str = arr;
   } else {
     str = DoubleToCString(value_->Number(), buffer);
   }
   return isolate_->factory()->NewStringFromAscii(CStrVector(str));
 }
 
 
 } }  // namespace v8::internal