| /* |
| * Copyright (C) 1999-2000 Harri Porten (porten@kde.org) |
| * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All Rights Reserved. |
| * Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca) |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "config.h" |
| #include "Lexer.h" |
| |
| #include "JSFunction.h" |
| #include "JSGlobalObjectFunctions.h" |
| #include "NodeInfo.h" |
| #include "Nodes.h" |
| #include "dtoa.h" |
| #include <ctype.h> |
| #include <limits.h> |
| #include <string.h> |
| #include <wtf/Assertions.h> |
| |
| using namespace WTF; |
| using namespace Unicode; |
| |
| // We can't specify the namespace in yacc's C output, so do it here instead. |
| using namespace JSC; |
| |
| #ifndef KDE_USE_FINAL |
| #include "Grammar.h" |
| #endif |
| |
| #include "Lookup.h" |
| #include "Lexer.lut.h" |
| |
| // A bridge for yacc from the C world to the C++ world. |
| int jscyylex(void* lvalp, void* llocp, void* globalData) |
| { |
| return static_cast<JSGlobalData*>(globalData)->lexer->lex(lvalp, llocp); |
| } |
| |
| namespace JSC { |
| |
| static const UChar byteOrderMark = 0xFEFF; |
| |
| Lexer::Lexer(JSGlobalData* globalData) |
| : m_isReparsing(false) |
| , m_globalData(globalData) |
| , m_keywordTable(JSC::mainTable) |
| { |
| m_buffer8.reserveInitialCapacity(initialReadBufferCapacity); |
| m_buffer16.reserveInitialCapacity(initialReadBufferCapacity); |
| } |
| |
| Lexer::~Lexer() |
| { |
| m_keywordTable.deleteTable(); |
| } |
| |
| inline const UChar* Lexer::currentCharacter() const |
| { |
| return m_code - 4; |
| } |
| |
| inline int Lexer::currentOffset() const |
| { |
| return currentCharacter() - m_codeStart; |
| } |
| |
| ALWAYS_INLINE void Lexer::shift1() |
| { |
| m_current = m_next1; |
| m_next1 = m_next2; |
| m_next2 = m_next3; |
| if (LIKELY(m_code < m_codeEnd)) |
| m_next3 = m_code[0]; |
| else |
| m_next3 = -1; |
| |
| ++m_code; |
| } |
| |
| ALWAYS_INLINE void Lexer::shift2() |
| { |
| m_current = m_next2; |
| m_next1 = m_next3; |
| if (LIKELY(m_code + 1 < m_codeEnd)) { |
| m_next2 = m_code[0]; |
| m_next3 = m_code[1]; |
| } else { |
| m_next2 = m_code < m_codeEnd ? m_code[0] : -1; |
| m_next3 = -1; |
| } |
| |
| m_code += 2; |
| } |
| |
| ALWAYS_INLINE void Lexer::shift3() |
| { |
| m_current = m_next3; |
| if (LIKELY(m_code + 2 < m_codeEnd)) { |
| m_next1 = m_code[0]; |
| m_next2 = m_code[1]; |
| m_next3 = m_code[2]; |
| } else { |
| m_next1 = m_code < m_codeEnd ? m_code[0] : -1; |
| m_next2 = m_code + 1 < m_codeEnd ? m_code[1] : -1; |
| m_next3 = -1; |
| } |
| |
| m_code += 3; |
| } |
| |
| ALWAYS_INLINE void Lexer::shift4() |
| { |
| if (LIKELY(m_code + 3 < m_codeEnd)) { |
| m_current = m_code[0]; |
| m_next1 = m_code[1]; |
| m_next2 = m_code[2]; |
| m_next3 = m_code[3]; |
| } else { |
| m_current = m_code < m_codeEnd ? m_code[0] : -1; |
| m_next1 = m_code + 1 < m_codeEnd ? m_code[1] : -1; |
| m_next2 = m_code + 2 < m_codeEnd ? m_code[2] : -1; |
| m_next3 = -1; |
| } |
| |
| m_code += 4; |
| } |
| |
| void Lexer::setCode(const SourceCode& source) |
| { |
| m_lineNumber = source.firstLine(); |
| m_delimited = false; |
| m_lastToken = -1; |
| |
| const UChar* data = source.provider()->data(); |
| |
| m_source = &source; |
| m_codeStart = data; |
| m_code = data + source.startOffset(); |
| m_codeEnd = data + source.endOffset(); |
| m_error = false; |
| m_atLineStart = true; |
| |
| // ECMA-262 calls for stripping all Cf characters, but we only strip BOM characters. |
| // See <https://bugs.webkit.org/show_bug.cgi?id=4931> for details. |
| if (source.provider()->hasBOMs()) { |
| for (const UChar* p = m_codeStart; p < m_codeEnd; ++p) { |
| if (UNLIKELY(*p == byteOrderMark)) { |
| copyCodeWithoutBOMs(); |
| break; |
| } |
| } |
| } |
| |
| // Read the first characters into the 4-character buffer. |
| shift4(); |
| ASSERT(currentOffset() == source.startOffset()); |
| } |
| |
| void Lexer::copyCodeWithoutBOMs() |
| { |
| // Note: In this case, the character offset data for debugging will be incorrect. |
| // If it's important to correctly debug code with extraneous BOMs, then the caller |
| // should strip the BOMs when creating the SourceProvider object and do its own |
| // mapping of offsets within the stripped text to original text offset. |
| |
| m_codeWithoutBOMs.reserveCapacity(m_codeEnd - m_code); |
| for (const UChar* p = m_code; p < m_codeEnd; ++p) { |
| UChar c = *p; |
| if (c != byteOrderMark) |
| m_codeWithoutBOMs.append(c); |
| } |
| ptrdiff_t startDelta = m_codeStart - m_code; |
| m_code = m_codeWithoutBOMs.data(); |
| m_codeStart = m_code + startDelta; |
| m_codeEnd = m_codeWithoutBOMs.data() + m_codeWithoutBOMs.size(); |
| } |
| |
| void Lexer::shiftLineTerminator() |
| { |
| ASSERT(isLineTerminator(m_current)); |
| |
| // Allow both CRLF and LFCR. |
| if (m_current + m_next1 == '\n' + '\r') |
| shift2(); |
| else |
| shift1(); |
| |
| ++m_lineNumber; |
| } |
| |
| ALWAYS_INLINE Identifier* Lexer::makeIdentifier(const UChar* characters, size_t length) |
| { |
| m_identifiers.append(Identifier(m_globalData, characters, length)); |
| return &m_identifiers.last(); |
| } |
| |
| inline bool Lexer::lastTokenWasRestrKeyword() const |
| { |
| return m_lastToken == CONTINUE || m_lastToken == BREAK || m_lastToken == RETURN || m_lastToken == THROW; |
| } |
| |
| static NEVER_INLINE bool isNonASCIIIdentStart(int c) |
| { |
| return category(c) & (Letter_Uppercase | Letter_Lowercase | Letter_Titlecase | Letter_Modifier | Letter_Other); |
| } |
| |
| static inline bool isIdentStart(int c) |
| { |
| return isASCII(c) ? isASCIIAlpha(c) || c == '$' || c == '_' : isNonASCIIIdentStart(c); |
| } |
| |
| static NEVER_INLINE bool isNonASCIIIdentPart(int c) |
| { |
| return category(c) & (Letter_Uppercase | Letter_Lowercase | Letter_Titlecase | Letter_Modifier | Letter_Other |
| | Mark_NonSpacing | Mark_SpacingCombining | Number_DecimalDigit | Punctuation_Connector); |
| } |
| |
| static inline bool isIdentPart(int c) |
| { |
| return isASCII(c) ? isASCIIAlphanumeric(c) || c == '$' || c == '_' : isNonASCIIIdentPart(c); |
| } |
| |
| static inline int singleEscape(int c) |
| { |
| switch (c) { |
| case 'b': |
| return 0x08; |
| case 't': |
| return 0x09; |
| case 'n': |
| return 0x0A; |
| case 'v': |
| return 0x0B; |
| case 'f': |
| return 0x0C; |
| case 'r': |
| return 0x0D; |
| default: |
| return c; |
| } |
| } |
| |
| inline void Lexer::record8(int c) |
| { |
| ASSERT(c >= 0); |
| ASSERT(c <= 0xFF); |
| m_buffer8.append(static_cast<char>(c)); |
| } |
| |
| inline void Lexer::record16(UChar c) |
| { |
| m_buffer16.append(c); |
| } |
| |
| inline void Lexer::record16(int c) |
| { |
| ASSERT(c >= 0); |
| ASSERT(c <= USHRT_MAX); |
| record16(UChar(static_cast<unsigned short>(c))); |
| } |
| |
| int Lexer::lex(void* p1, void* p2) |
| { |
| ASSERT(!m_error); |
| ASSERT(m_buffer8.isEmpty()); |
| ASSERT(m_buffer16.isEmpty()); |
| |
| YYSTYPE* lvalp = static_cast<YYSTYPE*>(p1); |
| YYLTYPE* llocp = static_cast<YYLTYPE*>(p2); |
| int token = 0; |
| m_terminator = false; |
| |
| start: |
| while (isWhiteSpace(m_current)) |
| shift1(); |
| |
| int startOffset = currentOffset(); |
| |
| if (m_current == -1) { |
| if (!m_terminator && !m_delimited && !m_isReparsing) { |
| // automatic semicolon insertion if program incomplete |
| token = ';'; |
| goto doneSemicolon; |
| } |
| return 0; |
| } |
| |
| m_delimited = false; |
| switch (m_current) { |
| case '>': |
| if (m_next1 == '>' && m_next2 == '>') { |
| if (m_next3 == '=') { |
| shift4(); |
| token = URSHIFTEQUAL; |
| break; |
| } |
| shift3(); |
| token = URSHIFT; |
| break; |
| } |
| if (m_next1 == '>') { |
| if (m_next2 == '=') { |
| shift3(); |
| token = RSHIFTEQUAL; |
| break; |
| } |
| shift2(); |
| token = RSHIFT; |
| break; |
| } |
| if (m_next1 == '=') { |
| shift2(); |
| token = GE; |
| break; |
| } |
| shift1(); |
| token = '>'; |
| break; |
| case '=': |
| if (m_next1 == '=') { |
| if (m_next2 == '=') { |
| shift3(); |
| token = STREQ; |
| break; |
| } |
| shift2(); |
| token = EQEQ; |
| break; |
| } |
| shift1(); |
| token = '='; |
| break; |
| case '!': |
| if (m_next1 == '=') { |
| if (m_next2 == '=') { |
| shift3(); |
| token = STRNEQ; |
| break; |
| } |
| shift2(); |
| token = NE; |
| break; |
| } |
| shift1(); |
| token = '!'; |
| break; |
| case '<': |
| if (m_next1 == '!' && m_next2 == '-' && m_next3 == '-') { |
| // <!-- marks the beginning of a line comment (for www usage) |
| shift4(); |
| goto inSingleLineComment; |
| } |
| if (m_next1 == '<') { |
| if (m_next2 == '=') { |
| shift3(); |
| token = LSHIFTEQUAL; |
| break; |
| } |
| shift2(); |
| token = LSHIFT; |
| break; |
| } |
| if (m_next1 == '=') { |
| shift2(); |
| token = LE; |
| break; |
| } |
| shift1(); |
| token = '<'; |
| break; |
| case '+': |
| if (m_next1 == '+') { |
| shift2(); |
| if (m_terminator) { |
| token = AUTOPLUSPLUS; |
| break; |
| } |
| token = PLUSPLUS; |
| break; |
| } |
| if (m_next1 == '=') { |
| shift2(); |
| token = PLUSEQUAL; |
| break; |
| } |
| shift1(); |
| token = '+'; |
| break; |
| case '-': |
| if (m_next1 == '-') { |
| if (m_atLineStart && m_next2 == '>') { |
| shift3(); |
| goto inSingleLineComment; |
| } |
| shift2(); |
| if (m_terminator) { |
| token = AUTOMINUSMINUS; |
| break; |
| } |
| token = MINUSMINUS; |
| break; |
| } |
| if (m_next1 == '=') { |
| shift2(); |
| token = MINUSEQUAL; |
| break; |
| } |
| shift1(); |
| token = '-'; |
| break; |
| case '*': |
| if (m_next1 == '=') { |
| shift2(); |
| token = MULTEQUAL; |
| break; |
| } |
| shift1(); |
| token = '*'; |
| break; |
| case '/': |
| if (m_next1 == '/') { |
| shift2(); |
| goto inSingleLineComment; |
| } |
| if (m_next1 == '*') |
| goto inMultiLineComment; |
| if (m_next1 == '=') { |
| shift2(); |
| token = DIVEQUAL; |
| break; |
| } |
| shift1(); |
| token = '/'; |
| break; |
| case '&': |
| if (m_next1 == '&') { |
| shift2(); |
| token = AND; |
| break; |
| } |
| if (m_next1 == '=') { |
| shift2(); |
| token = ANDEQUAL; |
| break; |
| } |
| shift1(); |
| token = '&'; |
| break; |
| case '^': |
| if (m_next1 == '=') { |
| shift2(); |
| token = XOREQUAL; |
| break; |
| } |
| shift1(); |
| token = '^'; |
| break; |
| case '%': |
| if (m_next1 == '=') { |
| shift2(); |
| token = MODEQUAL; |
| break; |
| } |
| shift1(); |
| token = '%'; |
| break; |
| case '|': |
| if (m_next1 == '=') { |
| shift2(); |
| token = OREQUAL; |
| break; |
| } |
| if (m_next1 == '|') { |
| shift2(); |
| token = OR; |
| break; |
| } |
| shift1(); |
| token = '|'; |
| break; |
| case '.': |
| if (isASCIIDigit(m_next1)) { |
| record8('.'); |
| shift1(); |
| goto inNumberAfterDecimalPoint; |
| } |
| token = '.'; |
| shift1(); |
| break; |
| case ',': |
| case '~': |
| case '?': |
| case ':': |
| case '(': |
| case ')': |
| case '[': |
| case ']': |
| token = m_current; |
| shift1(); |
| break; |
| case ';': |
| shift1(); |
| m_delimited = true; |
| token = ';'; |
| break; |
| case '{': |
| lvalp->intValue = currentOffset(); |
| shift1(); |
| token = OPENBRACE; |
| break; |
| case '}': |
| lvalp->intValue = currentOffset(); |
| shift1(); |
| m_delimited = true; |
| token = CLOSEBRACE; |
| break; |
| case '\\': |
| goto startIdentifierWithBackslash; |
| case '0': |
| goto startNumberWithZeroDigit; |
| case '1': |
| case '2': |
| case '3': |
| case '4': |
| case '5': |
| case '6': |
| case '7': |
| case '8': |
| case '9': |
| goto startNumber; |
| case '"': |
| case '\'': |
| goto startString; |
| default: |
| if (isIdentStart(m_current)) |
| goto startIdentifierOrKeyword; |
| if (isLineTerminator(m_current)) { |
| shiftLineTerminator(); |
| m_atLineStart = true; |
| m_terminator = true; |
| if (lastTokenWasRestrKeyword()) { |
| token = ';'; |
| goto doneSemicolon; |
| } |
| goto start; |
| } |
| goto returnError; |
| } |
| |
| m_atLineStart = false; |
| goto returnToken; |
| |
| startString: { |
| int stringQuoteCharacter = m_current; |
| shift1(); |
| |
| const UChar* stringStart = currentCharacter(); |
| while (m_current != stringQuoteCharacter) { |
| // Fast check for characters that require special handling. |
| // Catches -1, \n, \r, \, 0x2028, and 0x2029 as efficiently |
| // as possible, and lets through all common ASCII characters. |
| if (UNLIKELY(m_current == '\\') || UNLIKELY(((static_cast<unsigned>(m_current) - 0xE) & 0x2000))) { |
| m_buffer16.append(stringStart, currentCharacter() - stringStart); |
| goto inString; |
| } |
| shift1(); |
| } |
| lvalp->ident = makeIdentifier(stringStart, currentCharacter() - stringStart); |
| shift1(); |
| m_atLineStart = false; |
| m_delimited = false; |
| token = STRING; |
| goto returnToken; |
| |
| inString: |
| while (m_current != stringQuoteCharacter) { |
| if (m_current == '\\') |
| goto inStringEscapeSequence; |
| if (UNLIKELY(isLineTerminator(m_current))) |
| goto returnError; |
| if (UNLIKELY(m_current == -1)) |
| goto returnError; |
| record16(m_current); |
| shift1(); |
| } |
| goto doneString; |
| |
| inStringEscapeSequence: |
| shift1(); |
| if (m_current == 'x') { |
| shift1(); |
| if (isASCIIHexDigit(m_current) && isASCIIHexDigit(m_next1)) { |
| record16(convertHex(m_current, m_next1)); |
| shift2(); |
| goto inString; |
| } |
| record16('x'); |
| if (m_current == stringQuoteCharacter) |
| goto doneString; |
| goto inString; |
| } |
| if (m_current == 'u') { |
| shift1(); |
| if (isASCIIHexDigit(m_current) && isASCIIHexDigit(m_next1) && isASCIIHexDigit(m_next2) && isASCIIHexDigit(m_next3)) { |
| record16(convertUnicode(m_current, m_next1, m_next2, m_next3)); |
| shift4(); |
| goto inString; |
| } |
| if (m_current == stringQuoteCharacter) { |
| record16('u'); |
| goto doneString; |
| } |
| goto returnError; |
| } |
| if (isASCIIOctalDigit(m_current)) { |
| if (m_current >= '0' && m_current <= '3' && isASCIIOctalDigit(m_next1) && isASCIIOctalDigit(m_next2)) { |
| record16((m_current - '0') * 64 + (m_next1 - '0') * 8 + m_next2 - '0'); |
| shift3(); |
| goto inString; |
| } |
| if (isASCIIOctalDigit(m_next1)) { |
| record16((m_current - '0') * 8 + m_next1 - '0'); |
| shift2(); |
| goto inString; |
| } |
| record16(m_current - '0'); |
| shift1(); |
| goto inString; |
| } |
| if (isLineTerminator(m_current)) { |
| shiftLineTerminator(); |
| goto inString; |
| } |
| record16(singleEscape(m_current)); |
| shift1(); |
| goto inString; |
| } |
| |
| startIdentifierWithBackslash: |
| shift1(); |
| if (UNLIKELY(m_current != 'u')) |
| goto returnError; |
| shift1(); |
| if (UNLIKELY(!isASCIIHexDigit(m_current) || !isASCIIHexDigit(m_next1) || !isASCIIHexDigit(m_next2) || !isASCIIHexDigit(m_next3))) |
| goto returnError; |
| token = convertUnicode(m_current, m_next1, m_next2, m_next3); |
| if (UNLIKELY(!isIdentStart(token))) |
| goto returnError; |
| goto inIdentifierAfterCharacterCheck; |
| |
| startIdentifierOrKeyword: { |
| const UChar* identifierStart = currentCharacter(); |
| shift1(); |
| while (isIdentPart(m_current)) |
| shift1(); |
| if (LIKELY(m_current != '\\')) { |
| lvalp->ident = makeIdentifier(identifierStart, currentCharacter() - identifierStart); |
| goto doneIdentifierOrKeyword; |
| } |
| m_buffer16.append(identifierStart, currentCharacter() - identifierStart); |
| } |
| |
| do { |
| shift1(); |
| if (UNLIKELY(m_current != 'u')) |
| goto returnError; |
| shift1(); |
| if (UNLIKELY(!isASCIIHexDigit(m_current) || !isASCIIHexDigit(m_next1) || !isASCIIHexDigit(m_next2) || !isASCIIHexDigit(m_next3))) |
| goto returnError; |
| token = convertUnicode(m_current, m_next1, m_next2, m_next3); |
| if (UNLIKELY(!isIdentPart(token))) |
| goto returnError; |
| inIdentifierAfterCharacterCheck: |
| record16(token); |
| shift4(); |
| |
| while (isIdentPart(m_current)) { |
| record16(m_current); |
| shift1(); |
| } |
| } while (UNLIKELY(m_current == '\\')); |
| goto doneIdentifier; |
| |
| inSingleLineComment: |
| while (!isLineTerminator(m_current)) { |
| if (UNLIKELY(m_current == -1)) |
| return 0; |
| shift1(); |
| } |
| shiftLineTerminator(); |
| m_atLineStart = true; |
| m_terminator = true; |
| if (lastTokenWasRestrKeyword()) |
| goto doneSemicolon; |
| goto start; |
| |
| inMultiLineComment: |
| shift2(); |
| while (m_current != '*' || m_next1 != '/') { |
| if (isLineTerminator(m_current)) |
| shiftLineTerminator(); |
| else { |
| shift1(); |
| if (UNLIKELY(m_current == -1)) |
| goto returnError; |
| } |
| } |
| shift2(); |
| m_atLineStart = false; |
| goto start; |
| |
| startNumberWithZeroDigit: |
| shift1(); |
| if ((m_current | 0x20) == 'x' && isASCIIHexDigit(m_next1)) { |
| shift1(); |
| goto inHex; |
| } |
| if (m_current == '.') { |
| record8('0'); |
| record8('.'); |
| shift1(); |
| goto inNumberAfterDecimalPoint; |
| } |
| if ((m_current | 0x20) == 'e') { |
| record8('0'); |
| record8('e'); |
| shift1(); |
| goto inExponentIndicator; |
| } |
| if (isASCIIOctalDigit(m_current)) |
| goto inOctal; |
| if (isASCIIDigit(m_current)) |
| goto startNumber; |
| lvalp->doubleValue = 0; |
| goto doneNumeric; |
| |
| inNumberAfterDecimalPoint: |
| while (isASCIIDigit(m_current)) { |
| record8(m_current); |
| shift1(); |
| } |
| if ((m_current | 0x20) == 'e') { |
| record8('e'); |
| shift1(); |
| goto inExponentIndicator; |
| } |
| goto doneNumber; |
| |
| inExponentIndicator: |
| if (m_current == '+' || m_current == '-') { |
| record8(m_current); |
| shift1(); |
| } |
| if (!isASCIIDigit(m_current)) |
| goto returnError; |
| do { |
| record8(m_current); |
| shift1(); |
| } while (isASCIIDigit(m_current)); |
| goto doneNumber; |
| |
| inOctal: { |
| do { |
| record8(m_current); |
| shift1(); |
| } while (isASCIIOctalDigit(m_current)); |
| if (isASCIIDigit(m_current)) |
| goto startNumber; |
| |
| double dval = 0; |
| |
| const char* end = m_buffer8.end(); |
| for (const char* p = m_buffer8.data(); p < end; ++p) { |
| dval *= 8; |
| dval += *p - '0'; |
| } |
| if (dval >= mantissaOverflowLowerBound) |
| dval = parseIntOverflow(m_buffer8.data(), end - m_buffer8.data(), 8); |
| |
| m_buffer8.resize(0); |
| |
| lvalp->doubleValue = dval; |
| goto doneNumeric; |
| } |
| |
| inHex: { |
| do { |
| record8(m_current); |
| shift1(); |
| } while (isASCIIHexDigit(m_current)); |
| |
| double dval = 0; |
| |
| const char* end = m_buffer8.end(); |
| for (const char* p = m_buffer8.data(); p < end; ++p) { |
| dval *= 16; |
| dval += toASCIIHexValue(*p); |
| } |
| if (dval >= mantissaOverflowLowerBound) |
| dval = parseIntOverflow(m_buffer8.data(), end - m_buffer8.data(), 16); |
| |
| m_buffer8.resize(0); |
| |
| lvalp->doubleValue = dval; |
| goto doneNumeric; |
| } |
| |
| startNumber: |
| record8(m_current); |
| shift1(); |
| while (isASCIIDigit(m_current)) { |
| record8(m_current); |
| shift1(); |
| } |
| if (m_current == '.') { |
| record8('.'); |
| shift1(); |
| goto inNumberAfterDecimalPoint; |
| } |
| if ((m_current | 0x20) == 'e') { |
| record8('e'); |
| shift1(); |
| goto inExponentIndicator; |
| } |
| |
| // Fall through into doneNumber. |
| |
| doneNumber: |
| // Null-terminate string for strtod. |
| m_buffer8.append('\0'); |
| lvalp->doubleValue = WTF::strtod(m_buffer8.data(), 0); |
| m_buffer8.resize(0); |
| |
| // Fall through into doneNumeric. |
| |
| doneNumeric: |
| // No identifiers allowed directly after numeric literal, e.g. "3in" is bad. |
| if (UNLIKELY(isIdentStart(m_current))) |
| goto returnError; |
| |
| m_atLineStart = false; |
| m_delimited = false; |
| token = NUMBER; |
| goto returnToken; |
| |
| doneSemicolon: |
| token = ';'; |
| m_delimited = true; |
| goto returnToken; |
| |
| doneIdentifier: |
| m_atLineStart = false; |
| m_delimited = false; |
| lvalp->ident = makeIdentifier(m_buffer16.data(), m_buffer16.size()); |
| m_buffer16.resize(0); |
| token = IDENT; |
| goto returnToken; |
| |
| doneIdentifierOrKeyword: { |
| m_atLineStart = false; |
| m_delimited = false; |
| m_buffer16.resize(0); |
| const HashEntry* entry = m_keywordTable.entry(m_globalData, *lvalp->ident); |
| token = entry ? entry->lexerValue() : IDENT; |
| goto returnToken; |
| } |
| |
| doneString: |
| // Atomize constant strings in case they're later used in property lookup. |
| shift1(); |
| m_atLineStart = false; |
| m_delimited = false; |
| lvalp->ident = makeIdentifier(m_buffer16.data(), m_buffer16.size()); |
| m_buffer16.resize(0); |
| token = STRING; |
| |
| // Fall through into returnToken. |
| |
| returnToken: { |
| int lineNumber = m_lineNumber; |
| llocp->first_line = lineNumber; |
| llocp->last_line = lineNumber; |
| llocp->first_column = startOffset; |
| llocp->last_column = currentOffset(); |
| |
| m_lastToken = token; |
| return token; |
| } |
| |
| returnError: |
| m_error = true; |
| return -1; |
| } |
| |
| bool Lexer::scanRegExp() |
| { |
| ASSERT(m_buffer16.isEmpty()); |
| |
| bool lastWasEscape = false; |
| bool inBrackets = false; |
| |
| while (true) { |
| if (isLineTerminator(m_current) || m_current == -1) |
| return false; |
| if (m_current != '/' || lastWasEscape || inBrackets) { |
| // keep track of '[' and ']' |
| if (!lastWasEscape) { |
| if (m_current == '[' && !inBrackets) |
| inBrackets = true; |
| if (m_current == ']' && inBrackets) |
| inBrackets = false; |
| } |
| record16(m_current); |
| lastWasEscape = !lastWasEscape && m_current == '\\'; |
| } else { // end of regexp |
| m_pattern = UString(m_buffer16); |
| m_buffer16.resize(0); |
| shift1(); |
| break; |
| } |
| shift1(); |
| } |
| |
| while (isIdentPart(m_current)) { |
| record16(m_current); |
| shift1(); |
| } |
| m_flags = UString(m_buffer16); |
| m_buffer16.resize(0); |
| |
| return true; |
| } |
| |
| void Lexer::clear() |
| { |
| m_identifiers.clear(); |
| m_codeWithoutBOMs.clear(); |
| |
| Vector<char> newBuffer8; |
| newBuffer8.reserveInitialCapacity(initialReadBufferCapacity); |
| m_buffer8.swap(newBuffer8); |
| |
| Vector<UChar> newBuffer16; |
| newBuffer16.reserveInitialCapacity(initialReadBufferCapacity); |
| m_buffer16.swap(newBuffer16); |
| |
| m_isReparsing = false; |
| |
| m_pattern = UString(); |
| m_flags = UString(); |
| } |
| |
| SourceCode Lexer::sourceCode(int openBrace, int closeBrace, int firstLine) |
| { |
| if (m_codeWithoutBOMs.isEmpty()) |
| return SourceCode(m_source->provider(), openBrace, closeBrace + 1, firstLine); |
| |
| const UChar* data = m_source->provider()->data(); |
| |
| ASSERT(openBrace < closeBrace); |
| |
| int numBOMsBeforeOpenBrace = 0; |
| int numBOMsBetweenBraces = 0; |
| |
| int i; |
| for (i = m_source->startOffset(); i < openBrace; ++i) |
| numBOMsBeforeOpenBrace += data[i] == byteOrderMark; |
| for (; i < closeBrace; ++i) |
| numBOMsBetweenBraces += data[i] == byteOrderMark; |
| |
| return SourceCode(m_source->provider(), openBrace + numBOMsBeforeOpenBrace, |
| closeBrace + numBOMsBeforeOpenBrace + numBOMsBetweenBraces + 1, firstLine); |
| } |
| |
| } // namespace JSC |
