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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the utils of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef RE2NFA_H
#define RE2NFA_H
#include "nfa.h"
#include <QSet>
class RE2NFA
{
public:
RE2NFA(const QMap<QString, NFA> ¯os, const QSet<InputType> &maxInputSet, Qt::CaseSensitivity cs);
NFA parse(const QString &expression, int *errorColumn = 0);
private:
NFA parseExpr();
NFA parseBranch();
NFA parsePiece();
NFA parseAtom();
NFA parseMaybeQuantifier(const NFA &nfa);
NFA parseSet();
NFA parseSet2();
NFA createCharNFA();
private:
friend class RegExpTokenizer;
enum Token {
TOK_INVALID,
TOK_STRING,
TOK_LBRACE, // {
TOK_RBRACE, // }
TOK_LBRACKET, // [
TOK_RBRACKET, // ]
TOK_LPAREN, // (
TOK_RPAREN, // )
TOK_COMMA,
TOK_STAR,
TOK_OR,
TOK_QUESTION,
TOK_DOT,
TOK_PLUS,
TOK_SEQUENCE,
TOK_QUOTED_STRING
};
struct Symbol
{
inline Symbol() : token(TOK_INVALID), column(-1) {}
inline Symbol(Token t, const QString &l = QString()) : token(t), lexem(l), column(-1) {}
Token token;
QString lexem;
int column;
};
inline bool hasNext() const { return index < symbols.count(); }
inline Token next() { return symbols.at(index++).token; }
bool next(Token t);
bool test(Token t);
inline void prev() { index--; }
inline const Symbol &symbol() const { return symbols.at(index - 1); }
QString lexemUntil(Token t);
void tokenize(const QString &input);
QMap<QString, NFA> macros;
QVector<Symbol> symbols;
int index;
int errorColumn;
const QSet<InputType> maxInputSet;
Qt::CaseSensitivity caseSensitivity;
};
#endif // RE2NFA_H
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