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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.
* Copyright (C) 2010 Zoltan Herczeg (zherczeg@inf.u-szeged.hu)
*
* 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 "JSParser.h"
#include "Lookup.h"
#include "ParserArena.h"
#include "SourceCode.h"
#include <wtf/ASCIICType.h>
#include <wtf/AlwaysInline.h>
#include <wtf/SegmentedVector.h>
#include <wtf/Vector.h>
#include <wtf/unicode/Unicode.h>
namespace JSC {
class RegExp;
class Lexer {
WTF_MAKE_NONCOPYABLE(Lexer); WTF_MAKE_FAST_ALLOCATED;
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; }
bool isReparsing() const { return m_isReparsing; }
// Functions for the parser itself.
enum LexType { IdentifyReservedWords, IgnoreReservedWords };
JSTokenType lex(JSTokenData* lvalp, JSTokenInfo* llocp, LexType, bool strictMode);
bool nextTokenIsColon();
int lineNumber() const { return m_lineNumber; }
void setLastLineNumber(int lastLineNumber) { m_lastLineNumber = lastLineNumber; }
int lastLineNumber() const { return m_lastLineNumber; }
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();
int currentOffset() { return m_code - m_codeStart; }
void setOffset(int offset)
{
m_error = 0;
m_code = m_codeStart + offset;
m_buffer8.resize(0);
m_buffer16.resize(0);
// Faster than an if-else sequence
m_current = -1;
if (LIKELY(m_code < m_codeEnd))
m_current = *m_code;
}
void setLineNumber(int line)
{
m_lineNumber = line;
}
SourceProvider* sourceProvider() const { return m_source->provider(); }
private:
friend class JSGlobalData;
Lexer(JSGlobalData*);
~Lexer();
void record8(int);
void record16(int);
void record16(UChar);
void copyCodeWithoutBOMs();
ALWAYS_INLINE void shift();
ALWAYS_INLINE int peek(int offset);
int getUnicodeCharacter();
void shiftLineTerminator();
ALWAYS_INLINE const UChar* currentCharacter() const;
ALWAYS_INLINE int currentOffset() const;
ALWAYS_INLINE const Identifier* makeIdentifier(const UChar* characters, size_t length);
ALWAYS_INLINE bool lastTokenWasRestrKeyword() const;
ALWAYS_INLINE JSTokenType parseIdentifier(JSTokenData*, LexType);
ALWAYS_INLINE bool parseString(JSTokenData* lvalp, bool strictMode);
ALWAYS_INLINE void parseHex(double& returnValue);
ALWAYS_INLINE bool parseOctal(double& returnValue);
ALWAYS_INLINE bool parseDecimal(double& returnValue);
ALWAYS_INLINE void parseNumberAfterDecimalPoint();
ALWAYS_INLINE bool parseNumberAfterExponentIndicator();
ALWAYS_INLINE bool parseMultilineComment();
static const size_t initialReadBufferCapacity = 32;
int m_lineNumber;
int m_lastLineNumber;
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;
IdentifierArena* m_arena;
JSGlobalData* m_globalData;
const HashTable m_keywordTable;
};
inline bool Lexer::isWhiteSpace(int ch)
{
return isASCII(ch) ? (ch == ' ' || ch == '\t' || ch == 0xB || ch == 0xC) : (WTF::Unicode::isSeparatorSpace(ch) || ch == 0xFEFF);
}
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);
}
} // namespace JSC
#endif // Lexer_h
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