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-// 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(ROR, "rotate right", 11) /* only used by Crankshaft */ \
- 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 NE_STRICT: return EQ_STRICT;
- case LT: return GTE;
- case GT: return LTE;
- case LTE: return GT;
- case GTE: return LT;
- default:
- UNREACHABLE();
- return op;
- }
- }
-
- static Value ReverseCompareOp(Value op) {
- ASSERT(IsCompareOp(op));
- switch (op) {
- case EQ: return EQ;
- case NE: return NE;
- case EQ_STRICT: return EQ_STRICT;
- case NE_STRICT: return NE_STRICT;
- case LT: return GT;
- case GT: return LT;
- case LTE: return GTE;
- case GTE: return LTE;
- default:
- UNREACHABLE();
- 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_
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