/************************************************************************
**
**  Copyright (C) 2009, 2010  Strahinja Markovic
**
**  This file is part of Sigil.
**
**  Sigil is free software: you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation, either version 3 of the License, or
**  (at your option) any later version.
**
**  Sigil 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 General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with Sigil.  If not, see <http://www.gnu.org/licenses/>.
**
*************************************************************************/

#pragma once
#ifndef XHTMLHIGHLIGHTER_H
#define XHTMLHIGHLIGHTER_H

#include <QSyntaxHighlighter>


class XHTMLHighlighter : public QSyntaxHighlighter
{

public:

    // Constructor
    XHTMLHighlighter( QObject *parent = 0 );

protected:

    // Overrides the function from QSyntaxHighlighter;
    // gets called by QTextEditor whenever
    // a block (line of text) needs to be repainted
    void highlightBlock( const QString& text );

private:	

    // Returns the regex that matches the left bracket of a state
    QRegExp GetLeftBracketRegEx( int state ) const;

    // Returns the regex that matches the right bracket of a state
    QRegExp GetRightBracketRegEx( int state ) const;

    // Sets the requested state for the current text block
    void SetState( int state );

    // Clears the requested state for the current text block
    void ClearState( int state );

    // Checks if the requested state is set
    // for the current text block
    bool CheckState( int state ) const;
    
    // Formats the inside of a node;
    // "text" is the textblock/line;
    // "state" describes the node;
    // "index" is the index to start formatting from
    // "length" is the length of chars to format
    void FormatBody( const QString& text, int state, int index, int length );

    // Highlights the current line according to the state requested;
    // check to see if the node of type "state" is present;
    // if it is, the node is formatted
    void HighlightLine( const QString& text, int state );


    ///////////////////////////////
    // PRIVATE MEMBER VARIABLES
    ///////////////////////////////

    // Al the possible nodes/states
    enum BlockState
    {
        State_Text          = 1 << 0,
        State_Entity        = 1 << 1,	
        State_HTML          = 1 << 2,		
        State_CSS           = 1 << 3,
        State_CSSComment    = 1 << 4,	
        State_HTMLComment   = 1 << 5,
    };

    struct HighlightingRule
    {
        QRegExp pattern;
        QTextCharFormat format;
    };

    // Stores all of our highlighting rules
    // and the text formats used
    QHash<QString, HighlightingRule> m_Rules;	
};

#endif // XHTMLHIGHLIGHTER_H

