// 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 // 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_ #include "checks.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 // 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) \ /* 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() and Assignment::is_compound() 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_LET, "=init_let", 2) /* AST-use only. */ \ T(INIT_CONST, "=init_const", 2) /* AST-use only. */ \ T(INIT_CONST_HARMONY, "=init_const_harmony", 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) \ \ /* 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) \ \ /* Future reserved words (ECMA-262, section 7.6.1.2). */ \ T(FUTURE_RESERVED_WORD, NULL, 0) \ T(FUTURE_STRICT_RESERVED_WORD, NULL, 0) \ K(CONST, "const", 0) \ K(EXPORT, "export", 0) \ K(IMPORT, "import", 0) \ K(LET, "let", 0) \ \ /* Illegal token - not able to scan. */ \ T(ILLEGAL, "ILLEGAL", 0) \ \ /* Scanner-internal use only. */ \ T(WHITESPACE, NULL, 0) class Token { public: // All token values. #define T(name, string, precedence) name, enum Value { TOKEN_LIST(T, T) NUM_TOKENS }; #undef T // Returns a string corresponding to the C++ token name // (e.g. "LT" for the token LT). static const char* Name(Value tok) { ASSERT(tok < NUM_TOKENS); // tok is unsigned return name_[tok]; } // Predicates static bool IsKeyword(Value tok) { return token_type[tok] == 'K'; } 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 IsOrderedRelationalCompareOp(Value op) { return op == LT || op == LTE || op == GT || op == GTE; } static bool IsEqualityOp(Value op) { return op == EQ || op == EQ_STRICT; } static Value NegateCompareOp(Value op) { ASSERT(IsCompareOp(op)); switch (op) { case EQ: return NE; case NE: return EQ; case EQ_STRICT: return NE_STRICT; case LT: return GTE; case GT: return LTE; case LTE: return GT; case GTE: return LT; default: return op; } } static Value InvertCompareOp(Value op) { ASSERT(IsCompareOp(op)); switch (op) { case EQ: return NE; case NE: return EQ; case EQ_STRICT: return NE_STRICT; case LT: return GT; case GT: return LT; case LTE: return GTE; case GTE: return LTE; default: return op; } } 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; } static bool IsShiftOp(Value op) { return (SHL <= op) && (op <= SHR); } // 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(tok < NUM_TOKENS); // tok is unsigned. return string_[tok]; } // Returns the precedence > 0 for binary and compare // operators; returns 0 otherwise. static int Precedence(Value tok) { ASSERT(tok < NUM_TOKENS); // tok is unsigned. return precedence_[tok]; } 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_