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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtScript module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL-ONLY$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** If you have questions regarding the use of this file, please contact
** us via http://www.qt-project.org/.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSCRIPTLEXER_P_H
#define QSCRIPTLEXER_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/QString>
QT_BEGIN_NAMESPACE
class QScriptEnginePrivate;
class QScriptNameIdImpl;
namespace QScript {
class Lexer
{
public:
Lexer(QScriptEnginePrivate *eng);
~Lexer();
void setCode(const QString &c, int lineno);
int lex();
int currentLineNo() const { return yylineno; }
int currentColumnNo() const { return yycolumn; }
int startLineNo() const { return startlineno; }
int startColumnNo() const { return startcolumn; }
int endLineNo() const { return currentLineNo(); }
int endColumnNo() const
{ int col = currentColumnNo(); return (col > 0) ? col - 1 : col; }
bool prevTerminator() const { return terminator; }
enum State { Start,
Identifier,
InIdentifier,
InSingleLineComment,
InMultiLineComment,
InNum,
InNum0,
InHex,
InOctal,
InDecimal,
InExponentIndicator,
InExponent,
Hex,
Octal,
Number,
String,
Eof,
InString,
InEscapeSequence,
InHexEscape,
InUnicodeEscape,
Other,
Bad };
enum Error {
NoError,
IllegalCharacter,
UnclosedStringLiteral,
IllegalEscapeSequence,
IllegalUnicodeEscapeSequence,
UnclosedComment,
IllegalExponentIndicator,
IllegalIdentifier
};
enum ParenthesesState {
IgnoreParentheses,
CountParentheses,
BalancedParentheses
};
enum RegExpBodyPrefix {
NoPrefix,
EqualPrefix
};
bool scanRegExp(RegExpBodyPrefix prefix = NoPrefix);
QScriptNameIdImpl *pattern;
int flags;
State lexerState() const
{ return state; }
QString errorMessage() const
{ return errmsg; }
void setErrorMessage(const QString &err)
{ errmsg = err; }
void setErrorMessage(const char *err)
{ setErrorMessage(QString::fromLatin1(err)); }
Error error() const
{ return err; }
void clearError()
{ err = NoError; }
private:
QScriptEnginePrivate *driver;
int yylineno;
bool done;
char *buffer8;
QChar *buffer16;
uint size8, size16;
uint pos8, pos16;
bool terminator;
bool restrKeyword;
// encountered delimiter like "'" and "}" on last run
bool delimited;
int stackToken;
State state;
void setDone(State s);
uint pos;
void shift(uint p);
int lookupKeyword(const char *);
bool isWhiteSpace() const;
bool isLineTerminator() const;
bool isHexDigit(ushort c) const;
bool isOctalDigit(ushort c) const;
int matchPunctuator(ushort c1, ushort c2,
ushort c3, ushort c4);
ushort singleEscape(ushort c) const;
ushort convertOctal(ushort c1, ushort c2,
ushort c3) const;
public:
static unsigned char convertHex(ushort c1);
static unsigned char convertHex(ushort c1, ushort c2);
static QChar convertUnicode(ushort c1, ushort c2,
ushort c3, ushort c4);
static bool isIdentLetter(ushort c);
static bool isDecimalDigit(ushort c);
inline int ival() const { return qsyylval.ival; }
inline double dval() const { return qsyylval.dval; }
inline QScriptNameIdImpl *ustr() const { return qsyylval.ustr; }
const QChar *characterBuffer() const { return buffer16; }
int characterCount() const { return pos16; }
private:
void record8(ushort c);
void record16(QChar c);
void recordStartPos();
int findReservedWord(const QChar *buffer, int size) const;
void syncProhibitAutomaticSemicolon();
const QChar *code;
uint length;
int yycolumn;
int startlineno;
int startcolumn;
int bol; // begin of line
union {
int ival;
double dval;
QScriptNameIdImpl *ustr;
} qsyylval;
// current and following unicode characters
ushort current, next1, next2, next3;
struct keyword {
const char *name;
int token;
};
QString errmsg;
Error err;
bool wantRx;
bool check_reserved;
ParenthesesState parenthesesState;
int parenthesesCount;
bool prohibitAutomaticSemicolon;
};
} // namespace QScript
QT_END_NAMESPACE
#endif
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