18b112d2025046f85ef7f6be087c6129c872ebad2Ben Murdoch// Copyright 2011 the V8 project authors. All rights reserved. 23e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// Redistribution and use in source and binary forms, with or without 33e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// modification, are permitted provided that the following conditions are 43e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// met: 53e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// 63e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// * Redistributions of source code must retain the above copyright 73e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// notice, this list of conditions and the following disclaimer. 83e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// * Redistributions in binary form must reproduce the above 93e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// copyright notice, this list of conditions and the following 103e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// disclaimer in the documentation and/or other materials provided 113e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// with the distribution. 123e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// * Neither the name of Google Inc. nor the names of its 133e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// contributors may be used to endorse or promote products derived 143e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// from this software without specific prior written permission. 153e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// 163e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 173e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 183e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 193e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 203e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 213e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 223e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 233e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 243e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 253e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 263e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 273e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 283e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// Features shared by parsing and pre-parsing scanners. 293e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 303e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu#ifndef V8_SCANNER_BASE_H_ 313e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu#define V8_SCANNER_BASE_H_ 323e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 338a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang#include "globals.h" 348a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang#include "checks.h" 358a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang#include "allocation.h" 363e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu#include "token.h" 378a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang#include "unicode-inl.h" 388a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang#include "char-predicates.h" 398a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang#include "utils.h" 408a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang#include "list-inl.h" 413e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 423e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhunamespace v8 { 433e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhunamespace internal { 443e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 458a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang// Returns the value (0 .. 15) of a hexadecimal character c. 468a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang// If c is not a legal hexadecimal character, returns a value < 0. 478a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wanginline int HexValue(uc32 c) { 488a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang c -= '0'; 498a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang if (static_cast<unsigned>(c) <= 9) return c; 508a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang c = (c | 0x20) - ('a' - '0'); // detect 0x11..0x16 and 0x31..0x36. 518a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang if (static_cast<unsigned>(c) <= 5) return c + 10; 528a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang return -1; 538a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang} 548a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 558a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 56b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch// --------------------------------------------------------------------- 57b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch// Buffered stream of characters, using an internal UC16 buffer. 58b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch 59b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdochclass UC16CharacterStream { 608a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang public: 61b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch UC16CharacterStream() : pos_(0) { } 62b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch virtual ~UC16CharacterStream() { } 63b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch 64b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // Returns and advances past the next UC16 character in the input 65b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // stream. If there are no more characters, it returns a negative 66b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // value. 67b8e0da25ee8efac3bb05cd6b2730aafbd96119f4Ben Murdoch inline uc32 Advance() { 68b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch if (buffer_cursor_ < buffer_end_ || ReadBlock()) { 69b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch pos_++; 70b8e0da25ee8efac3bb05cd6b2730aafbd96119f4Ben Murdoch return static_cast<uc32>(*(buffer_cursor_++)); 71b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch } 72b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // Note: currently the following increment is necessary to avoid a 73b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // parser problem! The scanner treats the final kEndOfInput as 74b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // a character with a position, and does math relative to that 75b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // position. 76b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch pos_++; 778a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 78b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch return kEndOfInput; 79b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch } 808a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 81b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // Return the current position in the character stream. 82b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // Starts at zero. 83b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch inline unsigned pos() const { return pos_; } 84b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch 85b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // Skips forward past the next character_count UC16 characters 86b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // in the input, or until the end of input if that comes sooner. 87b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // Returns the number of characters actually skipped. If less 88b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // than character_count, 89b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch inline unsigned SeekForward(unsigned character_count) { 90b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch unsigned buffered_chars = 91b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch static_cast<unsigned>(buffer_end_ - buffer_cursor_); 92b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch if (character_count <= buffered_chars) { 93b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch buffer_cursor_ += character_count; 94b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch pos_ += character_count; 95b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch return character_count; 96b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch } 97b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch return SlowSeekForward(character_count); 98b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch } 998a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 100b8e0da25ee8efac3bb05cd6b2730aafbd96119f4Ben Murdoch // Pushes back the most recently read UC16 character (or negative 101b8e0da25ee8efac3bb05cd6b2730aafbd96119f4Ben Murdoch // value if at end of input), i.e., the value returned by the most recent 102b8e0da25ee8efac3bb05cd6b2730aafbd96119f4Ben Murdoch // call to Advance. 103b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // Must not be used right after calling SeekForward. 104b8e0da25ee8efac3bb05cd6b2730aafbd96119f4Ben Murdoch virtual void PushBack(int32_t character) = 0; 1058a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 1068a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang protected: 107b8e0da25ee8efac3bb05cd6b2730aafbd96119f4Ben Murdoch static const uc32 kEndOfInput = -1; 108b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch 109b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // Ensures that the buffer_cursor_ points to the character at 110b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // position pos_ of the input, if possible. If the position 111b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // is at or after the end of the input, return false. If there 112b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // are more characters available, return true. 113b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch virtual bool ReadBlock() = 0; 114b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch virtual unsigned SlowSeekForward(unsigned character_count) = 0; 115b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch 116b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch const uc16* buffer_cursor_; 117b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch const uc16* buffer_end_; 118b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch unsigned pos_; 1198a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang}; 1208a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 1218a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 1228b112d2025046f85ef7f6be087c6129c872ebad2Ben Murdochclass UnicodeCache { 123b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch// --------------------------------------------------------------------- 1248b112d2025046f85ef7f6be087c6129c872ebad2Ben Murdoch// Caching predicates used by scanners. 1258a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang public: 1268b112d2025046f85ef7f6be087c6129c872ebad2Ben Murdoch UnicodeCache() {} 1278a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang typedef unibrow::Utf8InputBuffer<1024> Utf8Decoder; 1288a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 12944f0eee88ff00398ff7f715fab053374d808c90dSteve Block StaticResource<Utf8Decoder>* utf8_decoder() { 1308a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang return &utf8_decoder_; 1318a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 1328a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 13344f0eee88ff00398ff7f715fab053374d808c90dSteve Block bool IsIdentifierStart(unibrow::uchar c) { return kIsIdentifierStart.get(c); } 13444f0eee88ff00398ff7f715fab053374d808c90dSteve Block bool IsIdentifierPart(unibrow::uchar c) { return kIsIdentifierPart.get(c); } 13544f0eee88ff00398ff7f715fab053374d808c90dSteve Block bool IsLineTerminator(unibrow::uchar c) { return kIsLineTerminator.get(c); } 13644f0eee88ff00398ff7f715fab053374d808c90dSteve Block bool IsWhiteSpace(unibrow::uchar c) { return kIsWhiteSpace.get(c); } 1378a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 1388a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang private: 13944f0eee88ff00398ff7f715fab053374d808c90dSteve Block 14044f0eee88ff00398ff7f715fab053374d808c90dSteve Block unibrow::Predicate<IdentifierStart, 128> kIsIdentifierStart; 14144f0eee88ff00398ff7f715fab053374d808c90dSteve Block unibrow::Predicate<IdentifierPart, 128> kIsIdentifierPart; 14244f0eee88ff00398ff7f715fab053374d808c90dSteve Block unibrow::Predicate<unibrow::LineTerminator, 128> kIsLineTerminator; 14344f0eee88ff00398ff7f715fab053374d808c90dSteve Block unibrow::Predicate<unibrow::WhiteSpace, 128> kIsWhiteSpace; 14444f0eee88ff00398ff7f715fab053374d808c90dSteve Block StaticResource<Utf8Decoder> utf8_decoder_; 14544f0eee88ff00398ff7f715fab053374d808c90dSteve Block 1468b112d2025046f85ef7f6be087c6129c872ebad2Ben Murdoch DISALLOW_COPY_AND_ASSIGN(UnicodeCache); 1478a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang}; 1488a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 1498b112d2025046f85ef7f6be087c6129c872ebad2Ben Murdoch 1508a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang// ---------------------------------------------------------------------------- 1519fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block// LiteralBuffer - Collector of chars of literals. 1528a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 1539fac840a46e8b7e26894f4792ba26dde14c56b04Steve Blockclass LiteralBuffer { 1548a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang public: 1559fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block LiteralBuffer() : is_ascii_(true), position_(0), backing_store_() { } 1569fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block 1579fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ~LiteralBuffer() { 1589fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block if (backing_store_.length() > 0) { 1599fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block backing_store_.Dispose(); 1609fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block } 1619fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block } 1629fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block 1639fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block inline void AddChar(uc16 character) { 1649fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block if (position_ >= backing_store_.length()) ExpandBuffer(); 1659fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block if (is_ascii_) { 1669fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block if (character < kMaxAsciiCharCodeU) { 1679fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block backing_store_[position_] = static_cast<byte>(character); 1689fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block position_ += kASCIISize; 1699fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block return; 1708a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 1719fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ConvertToUC16(); 1728a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 1739fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block *reinterpret_cast<uc16*>(&backing_store_[position_]) = character; 1749fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block position_ += kUC16Size; 1758a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 1768a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 1779fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block bool is_ascii() { return is_ascii_; } 1789fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block 1799fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block Vector<const uc16> uc16_literal() { 1809fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ASSERT(!is_ascii_); 1819fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ASSERT((position_ & 0x1) == 0); 1829fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block return Vector<const uc16>( 1839fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block reinterpret_cast<const uc16*>(backing_store_.start()), 1849fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block position_ >> 1); 1858a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 1868a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 1879fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block Vector<const char> ascii_literal() { 1889fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ASSERT(is_ascii_); 1899fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block return Vector<const char>( 1909fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block reinterpret_cast<const char*>(backing_store_.start()), 1919fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block position_); 1928a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 1938a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 1949fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block int length() { 1959fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block return is_ascii_ ? position_ : (position_ >> 1); 1968a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 1978a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 1988a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang void Reset() { 1999fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block position_ = 0; 2009fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block is_ascii_ = true; 2018a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 2028a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang private: 2039fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block static const int kInitialCapacity = 16; 2049fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block static const int kGrowthFactory = 4; 2059fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block static const int kMinConversionSlack = 256; 2069fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block static const int kMaxGrowth = 1 * MB; 2079fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block inline int NewCapacity(int min_capacity) { 2089fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block int capacity = Max(min_capacity, backing_store_.length()); 2099fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block int new_capacity = Min(capacity * kGrowthFactory, capacity + kMaxGrowth); 2109fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block return new_capacity; 2119fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block } 2129fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block 2139fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block void ExpandBuffer() { 2149fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block Vector<byte> new_store = Vector<byte>::New(NewCapacity(kInitialCapacity)); 2159fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block memcpy(new_store.start(), backing_store_.start(), position_); 2169fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block backing_store_.Dispose(); 2179fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block backing_store_ = new_store; 2189fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block } 2199fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block 2209fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block void ConvertToUC16() { 2219fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ASSERT(is_ascii_); 2229fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block Vector<byte> new_store; 2239fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block int new_content_size = position_ * kUC16Size; 2249fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block if (new_content_size >= backing_store_.length()) { 2259fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block // Ensure room for all currently read characters as UC16 as well 2269fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block // as the character about to be stored. 2279fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block new_store = Vector<byte>::New(NewCapacity(new_content_size)); 2289fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block } else { 2299fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block new_store = backing_store_; 2309fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block } 2319fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block char* src = reinterpret_cast<char*>(backing_store_.start()); 2329fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block uc16* dst = reinterpret_cast<uc16*>(new_store.start()); 2339fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block for (int i = position_ - 1; i >= 0; i--) { 2349fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block dst[i] = src[i]; 2359fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block } 2369fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block if (new_store.start() != backing_store_.start()) { 2379fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block backing_store_.Dispose(); 2389fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block backing_store_ = new_store; 2399fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block } 2409fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block position_ = new_content_size; 2419fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block is_ascii_ = false; 2429fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block } 2439fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block 2449fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block bool is_ascii_; 2459fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block int position_; 2469fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block Vector<byte> backing_store_; 24744f0eee88ff00398ff7f715fab053374d808c90dSteve Block 24844f0eee88ff00398ff7f715fab053374d808c90dSteve Block DISALLOW_COPY_AND_ASSIGN(LiteralBuffer); 2498a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang}; 2508a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 2519fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block 2528a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang// ---------------------------------------------------------------------------- 2538a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang// Scanner base-class. 2548a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 2558a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang// Generic functionality used by both JSON and JavaScript scanners. 2568a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wangclass Scanner { 2578a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang public: 2581e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block // -1 is outside of the range of any real source code. 2591e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block static const int kNoOctalLocation = -1; 2601e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block 2618a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang typedef unibrow::Utf8InputBuffer<1024> Utf8Decoder; 2628a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 2638a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang class LiteralScope { 2648a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang public: 2658a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang explicit LiteralScope(Scanner* self); 2668a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang ~LiteralScope(); 2678a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang void Complete(); 2688a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 2698a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang private: 2708a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Scanner* scanner_; 2718a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang bool complete_; 2728a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang }; 2738a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 2748b112d2025046f85ef7f6be087c6129c872ebad2Ben Murdoch explicit Scanner(UnicodeCache* scanner_contants); 2758a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 2768a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Returns the current token again. 2778a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Token::Value current_token() { return current_.token; } 2788a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 2798a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // One token look-ahead (past the token returned by Next()). 2808a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Token::Value peek() const { return next_.token; } 2818a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 2828a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang struct Location { 2838a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Location(int b, int e) : beg_pos(b), end_pos(e) { } 2848a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Location() : beg_pos(0), end_pos(0) { } 2851e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block 2861e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block bool IsValid() const { 2871e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block return beg_pos >= 0 && end_pos >= beg_pos; 2881e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block } 2891e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block 2908a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang int beg_pos; 2918a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang int end_pos; 2928a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang }; 2938a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 2941e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block static Location NoLocation() { 2951e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block return Location(-1, -1); 2961e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block } 2971e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block 2988a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Returns the location information for the current token 2998a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // (the token returned by Next()). 3008a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Location location() const { return current_.location; } 3018a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Location peek_location() const { return next_.location; } 3028a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 3031e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block // Returns the location of the last seen octal literal 3041e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block int octal_position() const { return octal_pos_; } 3051e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block void clear_octal_position() { octal_pos_ = -1; } 3061e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block 3078a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Returns the literal string, if any, for the current token (the 3088a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // token returned by Next()). The string is 0-terminated and in 3098a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // UTF-8 format; they may contain 0-characters. Literal strings are 3108a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // collected for identifiers, strings, and numbers. 3118a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // These functions only give the correct result if the literal 3128a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // was scanned between calls to StartLiteral() and TerminateLiteral(). 3139fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block bool is_literal_ascii() { 3149fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ASSERT_NOT_NULL(current_.literal_chars); 3159fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block return current_.literal_chars->is_ascii(); 3168a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 3179fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block Vector<const char> literal_ascii_string() { 3189fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ASSERT_NOT_NULL(current_.literal_chars); 3199fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block return current_.literal_chars->ascii_literal(); 3208a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 3219fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block Vector<const uc16> literal_uc16_string() { 3229fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ASSERT_NOT_NULL(current_.literal_chars); 3239fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block return current_.literal_chars->uc16_literal(); 3249fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block } 3259fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block int literal_length() const { 3269fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ASSERT_NOT_NULL(current_.literal_chars); 3279fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block return current_.literal_chars->length(); 3288a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 3298a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 3308a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Returns the literal string for the next token (the token that 3318a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // would be returned if Next() were called). 3329fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block bool is_next_literal_ascii() { 3339fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ASSERT_NOT_NULL(next_.literal_chars); 3349fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block return next_.literal_chars->is_ascii(); 3358a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 3369fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block Vector<const char> next_literal_ascii_string() { 3379fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ASSERT_NOT_NULL(next_.literal_chars); 3389fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block return next_.literal_chars->ascii_literal(); 3398a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 3409fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block Vector<const uc16> next_literal_uc16_string() { 3419fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ASSERT_NOT_NULL(next_.literal_chars); 3429fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block return next_.literal_chars->uc16_literal(); 3439fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block } 3449fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block int next_literal_length() const { 3459fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ASSERT_NOT_NULL(next_.literal_chars); 3469fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block return next_.literal_chars->length(); 3478a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 3488a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 3498a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang static const int kCharacterLookaheadBufferSize = 1; 3508a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 3518a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang protected: 3528a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // The current and look-ahead token. 3538a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang struct TokenDesc { 3548a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Token::Value token; 3558a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Location location; 3569fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block LiteralBuffer* literal_chars; 3578a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang }; 3588a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 3598a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Call this after setting source_ to the input. 3608a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang void Init() { 3618a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Set c0_ (one character ahead) 3628a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang ASSERT(kCharacterLookaheadBufferSize == 1); 3638a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Advance(); 3648a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Initialize current_ to not refer to a literal. 3659fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block current_.literal_chars = NULL; 3668a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 3678a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 3688a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Literal buffer support 3698a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang inline void StartLiteral() { 3709fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block LiteralBuffer* free_buffer = (current_.literal_chars == &literal_buffer1_) ? 3719fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block &literal_buffer2_ : &literal_buffer1_; 3729fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block free_buffer->Reset(); 3739fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block next_.literal_chars = free_buffer; 3748a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 3758a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 3768a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang inline void AddLiteralChar(uc32 c) { 3779fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block ASSERT_NOT_NULL(next_.literal_chars); 3789fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block next_.literal_chars->AddChar(c); 3798a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 3808a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 3818a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Complete scanning of a literal. 3828a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang inline void TerminateLiteral() { 3839fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block // Does nothing in the current implementation. 3848a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 3858a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 3868a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Stops scanning of a literal and drop the collected characters, 3878a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // e.g., due to an encountered error. 3888a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang inline void DropLiteral() { 3899fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block next_.literal_chars = NULL; 3908a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 3918a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 3928a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang inline void AddLiteralCharAdvance() { 3938a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang AddLiteralChar(c0_); 3948a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Advance(); 3958a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 3968a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 3978a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Low-level scanning support. 3988a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang void Advance() { c0_ = source_->Advance(); } 3998a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang void PushBack(uc32 ch) { 400b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch source_->PushBack(c0_); 4018a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang c0_ = ch; 4028a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 4038a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4048a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang inline Token::Value Select(Token::Value tok) { 4058a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Advance(); 4068a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang return tok; 4078a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 4088a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4098a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang inline Token::Value Select(uc32 next, Token::Value then, Token::Value else_) { 4108a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Advance(); 4118a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang if (c0_ == next) { 4128a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Advance(); 4138a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang return then; 4148a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } else { 4158a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang return else_; 4168a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 4178a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 4188a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4198a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang uc32 ScanHexEscape(uc32 c, int length); 4201e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block 4211e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block // Scans octal escape sequence. Also accepts "\0" decimal escape sequence. 4228a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang uc32 ScanOctalEscape(uc32 c, int length); 4238a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4248a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Return the current source position. 4258a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang int source_pos() { 4268a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang return source_->pos() - kCharacterLookaheadBufferSize; 4278a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 4288a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4298b112d2025046f85ef7f6be087c6129c872ebad2Ben Murdoch UnicodeCache* unicode_cache_; 43044f0eee88ff00398ff7f715fab053374d808c90dSteve Block 4319fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block // Buffers collecting literal strings, numbers, etc. 4329fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block LiteralBuffer literal_buffer1_; 4339fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block LiteralBuffer literal_buffer2_; 4349fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block 4358a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang TokenDesc current_; // desc for current token (as returned by Next()) 4368a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang TokenDesc next_; // desc for next token (one token look-ahead) 4378a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 438b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // Input stream. Must be initialized to an UC16CharacterStream. 439b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch UC16CharacterStream* source_; 4408a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4411e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block // Start position of the octal literal last scanned. 4421e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block int octal_pos_; 4438a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4448a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // One Unicode character look-ahead; c0_ < 0 at the end of the input. 4458a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang uc32 c0_; 4468a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang}; 4478a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4488a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang// ---------------------------------------------------------------------------- 4498a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang// JavaScriptScanner - base logic for JavaScript scanning. 4508a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4518a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wangclass JavaScriptScanner : public Scanner { 4528a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang public: 4538a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // A LiteralScope that disables recording of some types of JavaScript 4548a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // literals. If the scanner is configured to not record the specific 4558a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // type of literal, the scope will not call StartLiteral. 4568a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang class LiteralScope { 4578a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang public: 4589fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block explicit LiteralScope(JavaScriptScanner* self) 4598a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang : scanner_(self), complete_(false) { 4609fac840a46e8b7e26894f4792ba26dde14c56b04Steve Block scanner_->StartLiteral(); 4618a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 4628a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang ~LiteralScope() { 4638a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang if (!complete_) scanner_->DropLiteral(); 4648a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 4658a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang void Complete() { 4668a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang scanner_->TerminateLiteral(); 4678a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang complete_ = true; 4688a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 4698a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4708a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang private: 4718a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang JavaScriptScanner* scanner_; 4728a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang bool complete_; 4738a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang }; 4748a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4758b112d2025046f85ef7f6be087c6129c872ebad2Ben Murdoch explicit JavaScriptScanner(UnicodeCache* scanner_contants); 4768a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4778a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Returns the next token. 4788a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Token::Value Next(); 4798a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4808a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Returns true if there was a line terminator before the peek'ed token. 4818a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang bool has_line_terminator_before_next() const { 4828a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang return has_line_terminator_before_next_; 4838a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang } 4848a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4858a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Scans the input as a regular expression pattern, previous 4868a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // character(s) must be /(=). Returns true if a pattern is scanned. 4878a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang bool ScanRegExpPattern(bool seen_equal); 4888a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Returns true if regexp flags are scanned (always since flags can 4898a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // be empty). 4908a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang bool ScanRegExpFlags(); 4918a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4928a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Tells whether the buffer contains an identifier (no escapes). 4938a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Used for checking if a property name is an identifier. 4948a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang static bool IsIdentifier(unibrow::CharacterStream* buffer); 4958a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 4968a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Seek forward to the given position. This operation does not 4978a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // work in general, for instance when there are pushed back 4988a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // characters, but works for seeking forward until simple delimiter 4998a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // tokens, which is what it is used for. 5008a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang void SeekForward(int pos); 5018a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 5028a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang protected: 5038a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang bool SkipWhiteSpace(); 5048a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Token::Value SkipSingleLineComment(); 5058a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Token::Value SkipMultiLineComment(); 5068a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 5078a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Scans a single JavaScript token. 5088a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang void Scan(); 5098a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 5108a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang void ScanDecimalDigits(); 5118a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Token::Value ScanNumber(bool seen_period); 5128a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Token::Value ScanIdentifierOrKeyword(); 5138a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Token::Value ScanIdentifierSuffix(LiteralScope* literal); 5148a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 5158a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang void ScanEscape(); 5168a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Token::Value ScanString(); 5178a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 5188a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Scans a possible HTML comment -- begins with '<!'. 5198a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang Token::Value ScanHtmlComment(); 5208a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 5218a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // Decodes a unicode escape-sequence which is part of an identifier. 5228a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang // If the escape sequence cannot be decoded the result is kBadChar. 5238a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang uc32 ScanIdentifierUnicodeEscape(); 5248a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 5258a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang bool has_line_terminator_before_next_; 5268a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang}; 5278a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 5288a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 5298a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang// ---------------------------------------------------------------------------- 5308a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang// Keyword matching state machine. 5318a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang 5323e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhuclass KeywordMatcher { 5333e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// Incrementally recognize keywords. 5343e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// 5353e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// Recognized keywords: 5363e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// break case catch const* continue debugger* default delete do else 5373e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// finally false for function if in instanceof native* new null 5383e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// return switch this throw true try typeof var void while with 5393e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// 5403e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu// *: Actually "future reserved keywords". These are the only ones we 5418a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang// recognize, the remaining are allowed as identifiers. 5428a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang// In ES5 strict mode, we should disallow all reserved keywords. 5433e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu public: 5443e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu KeywordMatcher() 5453e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu : state_(INITIAL), 5463e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu token_(Token::IDENTIFIER), 5473e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu keyword_(NULL), 5483e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu counter_(0), 5493e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu keyword_token_(Token::ILLEGAL) {} 5503e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 5513e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu Token::Value token() { return token_; } 5523e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 5538a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang inline bool AddChar(unibrow::uchar input) { 5543e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu if (state_ != UNMATCHABLE) { 5553e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu Step(input); 5563e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu } 5578a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang return state_ != UNMATCHABLE; 5583e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu } 5593e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 5603e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu void Fail() { 5613e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu token_ = Token::IDENTIFIER; 5623e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu state_ = UNMATCHABLE; 5633e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu } 5643e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 5653e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu private: 5663e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu enum State { 5673e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu UNMATCHABLE, 5683e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu INITIAL, 5693e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu KEYWORD_PREFIX, 5703e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu KEYWORD_MATCHED, 5713e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu C, 5723e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu CA, 5733e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu CO, 5743e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu CON, 5753e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu D, 5763e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu DE, 5771e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block E, 5781e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block EX, 5793e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu F, 5803e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu I, 5811e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block IM, 5821e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block IMP, 5833e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu IN, 5843e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu N, 5851e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block P, 5861e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block PR, 5871e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block S, 5883e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu T, 5893e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu TH, 5903e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu TR, 5913e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu V, 5923e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu W 5933e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu }; 5943e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 5953e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu struct FirstState { 5963e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu const char* keyword; 5973e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu State state; 5983e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu Token::Value token; 5993e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu }; 6003e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 6013e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu // Range of possible first characters of a keyword. 6023e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu static const unsigned int kFirstCharRangeMin = 'b'; 6031e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block static const unsigned int kFirstCharRangeMax = 'y'; 6043e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu static const unsigned int kFirstCharRangeLength = 6053e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu kFirstCharRangeMax - kFirstCharRangeMin + 1; 6063e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu // State map for first keyword character range. 6073e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu static FirstState first_states_[kFirstCharRangeLength]; 6083e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 6093e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu // If input equals keyword's character at position, continue matching keyword 6103e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu // from that position. 6113e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu inline bool MatchKeywordStart(unibrow::uchar input, 6123e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu const char* keyword, 6133e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu int position, 6143e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu Token::Value token_if_match) { 6158a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang if (input != static_cast<unibrow::uchar>(keyword[position])) { 6168a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang return false; 6173e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu } 6188a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang state_ = KEYWORD_PREFIX; 6198a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang this->keyword_ = keyword; 6208a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang this->counter_ = position + 1; 6218a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang this->keyword_token_ = token_if_match; 6228a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang return true; 6233e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu } 6243e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 6253e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu // If input equals match character, transition to new state and return true. 6263e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu inline bool MatchState(unibrow::uchar input, char match, State new_state) { 6278a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang if (input != static_cast<unibrow::uchar>(match)) { 6288a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang return false; 6293e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu } 6308a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang state_ = new_state; 6318a31eba00023874d4a1dcdc5f411cc4336776874Shimeng (Simon) Wang return true; 6323e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu } 6333e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 6343e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu inline bool MatchKeyword(unibrow::uchar input, 6353e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu char match, 6363e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu State new_state, 6373e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu Token::Value keyword_token) { 6383e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu if (input != static_cast<unibrow::uchar>(match)) { 6393e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu return false; 6403e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu } 6413e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu state_ = new_state; 6423e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu token_ = keyword_token; 6433e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu return true; 6443e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu } 6453e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 6463e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu void Step(unibrow::uchar input); 6473e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 6483e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu // Current state. 6493e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu State state_; 6503e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu // Token for currently added characters. 6513e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu Token::Value token_; 6523e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 6533e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu // Matching a specific keyword string (there is only one possible valid 6543e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu // keyword with the current prefix). 6553e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu const char* keyword_; 6563e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu int counter_; 6573e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu Token::Value keyword_token_; 6583e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu}; 6593e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 6603e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 6613e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu} } // namespace v8::internal 6623e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu 6633e5fa29ddb82551500b118e9bf37af3966277b70Teng-Hui Zhu#endif // V8_SCANNER_BASE_H_ 664