token.h.svn-base

Google浏览器V8内核代码

  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_