Add initial parser support for harmony iteration

src/preparser.h

 // 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 112 matching lines @@
       : scanner_(scanner),
         log_(log),
         scope_(NULL),
         stack_limit_(stack_limit),
         strict_mode_violation_location_(i::Scanner::Location::invalid()),
         strict_mode_violation_type_(NULL),
         stack_overflow_(false),
         allow_lazy_(false),
         allow_natives_syntax_(false),
         allow_generators_(false),
+        allow_for_of_(false),
         parenthesized_function_(false) { }
 
   ~PreParser() {}
 
   bool allow_natives_syntax() const { return allow_natives_syntax_; }
   bool allow_lazy() const { return allow_lazy_; }
   bool allow_modules() const { return scanner_->HarmonyModules(); }
   bool allow_harmony_scoping() const { return scanner_->HarmonyScoping(); }
   bool allow_generators() const { return allow_generators_; }
+  bool allow_for_of() const { return allow_for_of_; }
 
   void set_allow_natives_syntax(bool allow) { allow_natives_syntax_ = allow; }
   void set_allow_lazy(bool allow) { allow_lazy_ = allow; }
   void set_allow_modules(bool allow) { scanner_->SetHarmonyModules(allow); }
   void set_allow_harmony_scoping(bool allow) {
     scanner_->SetHarmonyScoping(allow);
   }
   void set_allow_generators(bool allow) { allow_generators_ = allow; }
+  void set_allow_for_of(bool allow) { allow_for_of_ = allow; }
 
   // Pre-parse the program from the character stream; returns true on
   // success (even if parsing failed, the pre-parse data successfully
   // captured the syntax error), and false if a stack-overflow happened
   // during parsing.
   PreParseResult PreParseProgram() {
     Scope top_scope(&scope_, kTopLevelScope);
     bool ok = true;
     int start_position = scanner_->peek_location().beg_pos;
     ParseSourceElements(i::Token::EOS, &ok);
@@ skipping 488 matching lines @@
   bool Check(i::Token::Value token) {
     i::Token::Value next = peek();
     if (next == token) {
       Consume(next);
       return true;
     }
     return false;
   }
   void ExpectSemicolon(bool* ok);
 
+  bool CheckInOrOf();
+
   static int Precedence(i::Token::Value tok, bool accept_IN);
 
   void SetStrictModeViolation(i::Scanner::Location,
                               const char* type,
                               bool* ok);
 
   void CheckDelayedStrictModeViolation(int beg_pos, int end_pos, bool* ok);
 
   void StrictModeIdentifierViolation(i::Scanner::Location,
                                      const char* eval_args_type,
                                      Identifier identifier,
                                      bool* ok);
 
   i::Scanner* scanner_;
   i::ParserRecorder* log_;
   Scope* scope_;
   uintptr_t stack_limit_;
   i::Scanner::Location strict_mode_violation_location_;
   const char* strict_mode_violation_type_;
   bool stack_overflow_;
   bool allow_lazy_;
   bool allow_natives_syntax_;
   bool allow_generators_;
+  bool allow_for_of_;
   bool parenthesized_function_;
 };
 } }  // v8::preparser
 
 #endif  // V8_PREPARSER_H