diff --git a/src/token.h b/src/token.h
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+++ b/src/token.h
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+// Copyright 2006-2008 Google Inc. 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_TOKEN_H_
+#define V8_TOKEN_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:
+//
+//   T: Non-keyword tokens
+//   K: Keyword tokens
+//   F: Future (reserved) keyword tokens
+
+// IGNORE_TOKEN is a convenience macro that can be supplied as
+// an argument (at any position) for a TOKEN_LIST call. It does
+// nothing with tokens belonging to the respective category.
+
+#define IGNORE_TOKEN(name, string, precedence)
+
+#define TOKEN_LIST(T, K, F)                                             \
+  /* End of source indicator. */                                        \
+  T(EOS, "EOS", 0)                                                      \
+                                                                        \
+  /* Punctuators (ECMA-262, section 7.7, page 15). */                   \
+  T(LPAREN, "(", 0)                                                     \
+  T(RPAREN, ")", 0)                                                     \
+  T(LBRACK, "[", 0)                                                     \
+  T(RBRACK, "]", 0)                                                     \
+  T(LBRACE, "{", 0)                                                     \
+  T(RBRACE, "}", 0)                                                     \
+  T(COLON, ":", 0)                                                      \
+  T(SEMICOLON, ";", 0)                                                  \
+  T(PERIOD, ".", 0)                                                     \
+  T(CONDITIONAL, "?", 3)                                                \
+  T(INC, "++", 0)                                                       \
+  T(DEC, "--", 0)                                                       \
+                                                                        \
+  /* Assignment operators. */                                           \
+  /* IsAssignmentOp() relies on this block of enum values */            \
+  /* being contiguous and sorted in the same order! */                  \
+  T(INIT_VAR, "=init_var", 2)  /* AST-use only. */                      \
+  T(INIT_CONST, "=init_const", 2)  /* AST-use only. */                  \
+  T(ASSIGN, "=", 2)                                                     \
+  T(ASSIGN_BIT_OR, "|=", 2)                                             \
+  T(ASSIGN_BIT_XOR, "^=", 2)                                            \
+  T(ASSIGN_BIT_AND, "&=", 2)                                            \
+  T(ASSIGN_SHL, "<<=", 2)                                               \
+  T(ASSIGN_SAR, ">>=", 2)                                               \
+  T(ASSIGN_SHR, ">>>=", 2)                                              \
+  T(ASSIGN_ADD, "+=", 2)                                                \
+  T(ASSIGN_SUB, "-=", 2)                                                \
+  T(ASSIGN_MUL, "*=", 2)                                                \
+  T(ASSIGN_DIV, "/=", 2)                                                \
+  T(ASSIGN_MOD, "%=", 2)                                                \
+                                                                        \
+  /* Binary operators sorted by precedence. */                          \
+  /* IsBinaryOp() relies on this block of enum values */                \
+  /* being contiguous and sorted in the same order! */                  \
+  T(COMMA, ",", 1)                                                      \
+  T(OR, "||", 4)                                                        \
+  T(AND, "&&", 5)                                                       \
+  T(BIT_OR, "|", 6)                                                     \
+  T(BIT_XOR, "^", 7)                                                    \
+  T(BIT_AND, "&", 8)                                                    \
+  T(SHL, "<<", 11)                                                      \
+  T(SAR, ">>", 11)                                                      \
+  T(SHR, ">>>", 11)                                                     \
+  T(ADD, "+", 12)                                                       \
+  T(SUB, "-", 12)                                                       \
+  T(MUL, "*", 13)                                                       \
+  T(DIV, "/", 13)                                                       \
+  T(MOD, "%", 13)                                                       \
+                                                                        \
+  /* Compare operators sorted by precedence. */                         \
+  /* IsCompareOp() relies on this block of enum values */               \
+  /* being contiguous and sorted in the same order! */                  \
+  T(EQ, "==", 9)                                                        \
+  T(NE, "!=", 9)                                                        \
+  T(EQ_STRICT, "===", 9)                                                \
+  T(NE_STRICT, "!==", 9)                                                \
+  T(LT, "<", 10)                                                        \
+  T(GT, ">", 10)                                                        \
+  T(LTE, "<=", 10)                                                      \
+  T(GTE, ">=", 10)                                                      \
+  K(INSTANCEOF, "instanceof", 10)                                       \
+  K(IN, "in", 10)                                                       \
+                                                                        \
+  /* Unary operators. */                                                \
+  /* IsUnaryOp() relies on this block of enum values */                 \
+  /* being contiguous and sorted in the same order! */                  \
+  T(NOT, "!", 0)                                                        \
+  T(BIT_NOT, "~", 0)                                                    \
+  K(DELETE, "delete", 0)                                                \
+  K(TYPEOF, "typeof", 0)                                                \
+  K(VOID, "void", 0)                                                    \
+                                                                        \
+  /* Keywords (ECMA-262, section 7.5.2, page 13). */                    \
+  K(BREAK, "break", 0)                                                  \
+  K(CASE, "case", 0)                                                    \
+  K(CATCH, "catch", 0)                                                  \
+  K(CONTINUE, "continue", 0)                                            \
+  K(DEBUGGER, "debugger", 0)                                            \
+  K(DEFAULT, "default", 0)                                              \
+  /* DELETE */                                                          \
+  K(DO, "do", 0)                                                        \
+  K(ELSE, "else", 0)                                                    \
+  K(FINALLY, "finally", 0)                                              \
+  K(FOR, "for", 0)                                                      \
+  K(FUNCTION, "function", 0)                                            \
+  K(IF, "if", 0)                                                        \
+  /* IN */                                                              \
+  /* INSTANCEOF */                                                      \
+  K(NEW, "new", 0)                                                      \
+  K(RETURN, "return", 0)                                                \
+  K(SWITCH, "switch", 0)                                                \
+  K(THIS, "this", 0)                                                    \
+  K(THROW, "throw", 0)                                                  \
+  K(TRY, "try", 0)                                                      \
+  /* TYPEOF */                                                          \
+  K(VAR, "var", 0)                                                      \
+  /* VOID */                                                            \
+  K(WHILE, "while", 0)                                                  \
+  K(WITH, "with", 0)                                                    \
+                                                                        \
+  /* Future reserved words (ECMA-262, section 7.5.3, page 14). */       \
+  F(ABSTRACT, "abstract", 0)                                            \
+  F(BOOLEAN, "boolean", 0)                                              \
+  F(BYTE, "byte", 0)                                                    \
+  F(CHAR, "char", 0)                                                    \
+  F(CLASS, "class", 0)                                                  \
+  K(CONST, "const", 0)                                                  \
+  F(DOUBLE, "double", 0)                                                \
+  F(ENUM, "enum", 0)                                                    \
+  F(EXPORT, "export", 0)                                                \
+  F(EXTENDS, "extends", 0)                                              \
+  F(FINAL, "final", 0)                                                  \
+  F(FLOAT, "float", 0)                                                  \
+  F(GOTO, "goto", 0)                                                    \
+  F(IMPLEMENTS, "implements", 0)                                        \
+  F(IMPORT, "import", 0)                                                \
+  F(INT, "int", 0)                                                      \
+  F(INTERFACE, "interface", 0)                                          \
+  F(LONG, "long", 0)                                                    \
+  K(NATIVE, "native", 0)                                                \
+  F(PACKAGE, "package", 0)                                              \
+  F(PRIVATE, "private", 0)                                              \
+  F(PROTECTED, "protected", 0)                                          \
+  F(PUBLIC, "public", 0)                                                \
+  F(SHORT, "short", 0)                                                  \
+  F(STATIC, "static", 0)                                                \
+  F(SUPER, "super", 0)                                                  \
+  F(SYNCHRONIZED, "synchronized", 0)                                    \
+  F(THROWS, "throws", 0)                                                \
+  F(TRANSIENT, "transient", 0)                                          \
+  F(VOLATILE, "volatile", 0)                                            \
+                                                                        \
+  /* Literals (ECMA-262, section 7.8, page 16). */                      \
+  K(NULL_LITERAL, "null", 0)                                            \
+  K(TRUE_LITERAL, "true", 0)                                            \
+  K(FALSE_LITERAL, "false", 0)                                          \
+  T(NUMBER, NULL, 0)                                                    \
+  T(STRING, NULL, 0)                                                    \
+                                                                        \
+  /* Identifiers (not keywords or future reserved words). */            \
+  T(IDENTIFIER, NULL, 0)                                                \
+                                                                        \
+  /* Illegal token - not able to scan. */                               \
+  T(ILLEGAL, "ILLEGAL", 0)                                              \
+                                                                        \
+  /* Scanner-internal use only. */                                      \
+  T(COMMENT, NULL, 0)
+
+
+class Token {
+ public:
+  // All token values.
+#define T(name, string, precedence) name,
+  enum Value {
+    TOKEN_LIST(T, T, IGNORE_TOKEN)
+    NUM_TOKENS
+  };
+#undef T
+
+#ifdef DEBUG
+  // Returns a string corresponding to the C++ token name
+  // (e.g. "LT" for the token LT).
+  static const char* Name(Value tok) {
+    ASSERT(0 <= tok && tok < NUM_TOKENS);
+    return name_[tok];
+  }
+#endif
+
+  // Predicates
+  static bool IsAssignmentOp(Value tok) {
+    return INIT_VAR <= tok && tok <= ASSIGN_MOD;
+  }
+
+  static bool IsBinaryOp(Value op) {
+    return COMMA <= op && op <= MOD;
+  }
+
+  static bool IsCompareOp(Value op) {
+    return EQ <= op && op <= IN;
+  }
+
+  static bool IsBitOp(Value op) {
+    return (BIT_OR <= op && op <= SHR) || op == BIT_NOT;
+  }
+
+  static bool IsUnaryOp(Value op) {
+    return (NOT <= op && op <= VOID) || op == ADD || op == SUB;
+  }
+
+  static bool IsCountOp(Value op) {
+    return op == INC || op == DEC;
+  }
+
+  // Returns a string corresponding to the JS token string
+  // (.e., "<" for the token LT) or NULL if the token doesn't
+  // have a (unique) string (e.g. an IDENTIFIER).
+  static const char* String(Value tok) {
+    ASSERT(0 <= tok && tok < NUM_TOKENS);
+    return string_[tok];
+  }
+
+  // Returns the precedence > 0 for binary and compare
+  // operators; returns 0 otherwise.
+  static int Precedence(Value tok) {
+    ASSERT(0 <= tok && tok < NUM_TOKENS);
+    return precedence_[tok];
+  }
+
+  // Returns the keyword value if str is a keyword;
+  // returns IDENTIFIER otherwise. The class must
+  // have been initialized.
+  static Value Lookup(const char* str);
+
+  // Must be called once to initialize the class.
+  // Multiple calls are ignored.
+  static void Initialize();
+
+ private:
+#ifdef DEBUG
+  static const char* name_[NUM_TOKENS];
+#endif
+  static const char* string_[NUM_TOKENS];
+  static int8_t precedence_[NUM_TOKENS];
+};
+
+} }  // namespace v8::internal
+
+#endif  // V8_TOKEN_H_