/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** 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

** Nokia at qt-info@nokia.com.

** $QT_END_LICENSE$

**

****************************************************************************/

#ifndef QSCRIPTSYNTAXCHECKER_H

#define QSCRIPTSYNTAXCHECKER_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.h>

#include "qscriptgrammar_p.h"

QT_BEGIN_NAMESPACE

namespace QScript {

class Lexer;

class SyntaxChecker: protected QScriptGrammar

{

public:

    enum State {

        Error,

        Intermediate,

        Valid,

    };

    struct Result {

        Result(State s, int ln, int col, const QString &msg)

            : state(s), errorLineNumber(ln), errorColumnNumber(col),

              errorMessage(msg) {}

        State state;

        int errorLineNumber;

        int errorColumnNumber;

        QString errorMessage;

    };

    SyntaxChecker();

    ~SyntaxChecker();

    Result checkSyntax(const QString &code);

protected:

    bool automatic(QScript::Lexer *lexer, int token) const;

    inline void reallocateStack();

protected:

    int tos;

    int stack_size;

    int *state_stack;

};

inline void SyntaxChecker::reallocateStack()

{

    if (! stack_size)

        stack_size = 128;

    else

        stack_size <<= 1;

    state_stack = reinterpret_cast<int*> (qRealloc(state_stack, stack_size * sizeof(int)));

}

} // namespace QScript

QT_END_NAMESPACE

#endif