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/*
* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
*
* 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.
*
*/
#ifndef Lexer_h
#define Lexer_h
#include "Lookup.h"
#include "ParserArena.h"
#include "SourceCode.h"
#include <wtf/ASCIICType.h>
#include <wtf/SegmentedVector.h>
#include <wtf/Vector.h>
#include <wtf/unicode/Unicode.h>
namespace JSC {
class RegExp;
class Lexer : public Noncopyable {
public:
// Character manipulation functions.
static bool isWhiteSpace(int character);
static bool isLineTerminator(int character);
static unsigned char convertHex(int c1, int c2);
static UChar convertUnicode(int c1, int c2, int c3, int c4);
// Functions to set up parsing.
void setCode(const SourceCode&, ParserArena&);
void setIsReparsing() { m_isReparsing = true; }
// Functions for the parser itself.
int lex(void* lvalp, void* llocp);
int lineNumber() const { return m_lineNumber; }
bool prevTerminator() const { return m_terminator; }
SourceCode sourceCode(int openBrace, int closeBrace, int firstLine);
bool scanRegExp(const Identifier*& pattern, const Identifier*& flags, UChar patternPrefix = 0);
bool skipRegExp();
// Functions for use after parsing.
bool sawError() const { return m_error; }
void clear();
private:
friend class JSGlobalData;
Lexer(JSGlobalData*);
~Lexer();
void shift1();
void shift2();
void shift3();
void shift4();
void shiftLineTerminator();
void record8(int);
void record16(int);
void record16(UChar);
void copyCodeWithoutBOMs();
int currentOffset() const;
const UChar* currentCharacter() const;
const Identifier* makeIdentifier(const UChar* characters, size_t length);
bool lastTokenWasRestrKeyword() const;
static const size_t initialReadBufferCapacity = 32;
int m_lineNumber;
Vector<char> m_buffer8;
Vector<UChar> m_buffer16;
bool m_terminator;
bool m_delimited; // encountered delimiter like "'" and "}" on last run
int m_lastToken;
const SourceCode* m_source;
const UChar* m_code;
const UChar* m_codeStart;
const UChar* m_codeEnd;
bool m_isReparsing;
bool m_atLineStart;
bool m_error;
// current and following unicode characters (int to allow for -1 for end-of-file marker)
int m_current;
int m_next1;
int m_next2;
int m_next3;
IdentifierArena* m_arena;
JSGlobalData* m_globalData;
const HashTable m_keywordTable;
Vector<UChar> m_codeWithoutBOMs;
};
inline bool Lexer::isWhiteSpace(int ch)
{
return isASCII(ch) ? (ch == ' ' || ch == '\t' || ch == 0xB || ch == 0xC) : WTF::Unicode::isSeparatorSpace(ch);
}
inline bool Lexer::isLineTerminator(int ch)
{
return ch == '\r' || ch == '\n' || (ch & ~1) == 0x2028;
}
inline unsigned char Lexer::convertHex(int c1, int c2)
{
return (toASCIIHexValue(c1) << 4) | toASCIIHexValue(c2);
}
inline UChar Lexer::convertUnicode(int c1, int c2, int c3, int c4)
{
return (convertHex(c1, c2) << 8) | convertHex(c3, c4);
}
// A bridge for yacc from the C world to the C++ world.
inline int jscyylex(void* lvalp, void* llocp, void* globalData)
{
return static_cast<JSGlobalData*>(globalData)->lexer->lex(lvalp, llocp);
}
} // namespace JSC
#endif // Lexer_h
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