ES6: Implement object literal property shorthand

src/token.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_TOKEN_H_
 #define V8_TOKEN_H_
 
 #include "src/base/logging.h"
+#include "src/globals.h"
 
 namespace v8 {
 namespace internal {
 
 // TOKEN_LIST takes a list of 3 macros M, all of which satisfy the
 // same signature M(name, string, precedence), where name is the
 // symbolic token name, string is the corresponding syntactic symbol
 // (or NULL, for literals), and precedence is the precedence (or 0).
 // The parameters are invoked for token categories as follows:
 //
@@ skipping 161 matching lines @@
   static const char* Name(Value tok) {
     DCHECK(tok < NUM_TOKENS);  // tok is unsigned
     return name_[tok];
   }
 
   // Predicates
   static bool IsKeyword(Value tok) {
     return token_type[tok] == 'K';
   }
 
+  static bool IsIdentifier(Value tok, StrictMode strict_mode,
+                           bool is_generator) {
+    switch (tok) {
+      case IDENTIFIER:
+        return true;
+      case FUTURE_STRICT_RESERVED_WORD:
+      case LET:
+      case STATIC:
+        return strict_mode == SLOPPY;
+      case YIELD:
+        return !is_generator && strict_mode == SLOPPY;
+      default:
+        return false;
+    }
+    UNREACHABLE();
+    return false;
+  }
+
   static bool IsAssignmentOp(Value tok) {
     return INIT_VAR <= tok && tok <= ASSIGN_MOD;
   }
 
   static bool IsBinaryOp(Value op) {
     return COMMA <= op && op <= MOD;
   }
 
   static bool IsTruncatingBinaryOp(Value op) {
     return BIT_OR <= op && op <= ROR;
@@ skipping 88 matching lines @@
  private:
   static const char* const name_[NUM_TOKENS];
   static const char* const string_[NUM_TOKENS];
   static const int8_t precedence_[NUM_TOKENS];
   static const char token_type[NUM_TOKENS];
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TOKEN_H_