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

**

** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.

**

** This file is part of the example classes of the Qt Toolkit.

**

** This file may be used under the terms of the GNU General Public

** License version 2.0 as published by the Free Software Foundation

** and appearing in the file LICENSE.GPL included in the packaging of

** this file.  Please review the following information to ensure GNU

** General Public Licensing requirements will be met:

** http://www.trolltech.com/products/qt/opensource.html

**

** If you are unsure which license is appropriate for your use, please

** review the following information:

** http://www.trolltech.com/products/qt/licensing.html or contact the

** sales department at sales@trolltech.com.

**

** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE

** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

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

// highlighting rules have been adapted by Uwe Drechsel to match vym syntax

#include <QtGui>

#include "highlighter.h"

Highlighter::Highlighter(QTextDocument *parent)

    : QSyntaxHighlighter(parent)

{

    HighlightingRule rule;

    keywordFormat.setForeground(Qt::darkBlue);

    keywordFormat.setFontWeight(QFont::Bold);

    QStringList keywordPatterns;

    keywordPatterns << "\\baddBranch\\b" << "\\baddBranchBefore\\b" 

                    << "\\baddMapInsert\\b" << "\\baddMapReplace\\b"

                    << "\\bcolorBranch\\b" << "\\bcolorSubtree\\b"

                    << "\\bcut\\b" << "\\bdelete\\b" 

					<< "\\bdeletepKeepChilds\\b" << "\\bdeletepChilds\\b"

					<< "\\blinkTo\\b" << "\\bloadImage\\b"

					<< "\\bmoveBranchUp\\b" << "\\bmoveBranchDown\\b"

					<< "\\bmove\\b" << "\\bmoveRel\\b"

					<< "\\bpaste\\b" 

					<< "\\bsaveImage\\b" 

					<< "\\bscroll\\b" 

					<< "\\bselect\\b" << "\\bselectLastBranch\\b" << "\\bselectLastImage\\b"

					<< "\\bsetMapAuthor\\b" 

					<< "\\bsetMapComment\\b" 

					<< "\\bsetMapBackgroundColor\\b" 

					<< "\\bsetMapDefLinkColor\\b" 

					<< "\\bsetMapDefLinkStyle\\b" 

					<< "\\bsetHeading\\b" 

					<< "\\bsetHideExport\\b" 

					<< "\\bsetIncludeImagesHorizontally\\b" 

					<< "\\bsetIncludeImagesVertically\\b" 

					<< "\\bsetURL\\b" 

					<< "\\bsetVymLink\\b" 

					<< "\\bsetFlag\\b" 

					<< "\\bunscroll\\b" 

					<< "\\bunsetFlag\\b" 

					;

    foreach (QString pattern, keywordPatterns) {

        rule.pattern = QRegExp(pattern);

        rule.format = keywordFormat;

        highlightingRules.append(rule);

    }

	// QT keywords

	/*

    classFormat.setFontWeight(QFont::Bold);

    classFormat.setForeground(Qt::darkMagenta);

    rule.pattern = QRegExp("\\bQ[A-Za-z]+\\b");

    rule.format = classFormat;

    highlightingRules.append(rule);

	*/

	// Single line comments

    singleLineCommentFormat.setForeground(Qt::red);

    rule.pattern = QRegExp("#[^\n]*");

    rule.format = singleLineCommentFormat;

    highlightingRules.append(rule);

	// Single line comments

    multiLineCommentFormat.setForeground(Qt::red);

    commentStartExpression = QRegExp("/\\*");

    commentEndExpression = QRegExp("\\*/");

	// Quotations

    quotationFormat.setForeground(Qt::darkGreen);

    rule.pattern = QRegExp("\".*\"");

    rule.format = quotationFormat;

    highlightingRules.append(rule);

    QStringList valuePatterns;

    valuePatterns << "\\btrue\\b" << "\\bfalse\\b";

    foreach (QString pattern, valuePatterns) {

        rule.pattern = QRegExp(pattern);

        rule.format = quotationFormat;

        highlightingRules.append(rule);

    }

	// Funtions

	/*

    functionFormat.setFontItalic(true);

    functionFormat.setForeground(Qt::blue);

    rule.pattern = QRegExp("\\b[A-Za-z0-9_]+(?=\\()");

    rule.format = functionFormat;

    highlightingRules.append(rule);

	*/

}

void Highlighter::highlightBlock(const QString &text)

{

    foreach (HighlightingRule rule, highlightingRules) {

        QRegExp expression(rule.pattern);

        int index = text.indexOf(expression);

        while (index >= 0) {

            int length = expression.matchedLength();

            setFormat(index, length, rule.format);

            index = text.indexOf(expression, index + length);

        }

    }

    setCurrentBlockState(0);

    int startIndex = 0;

    if (previousBlockState() != 1)

        startIndex = text.indexOf(commentStartExpression);

    while (startIndex >= 0) {

        int endIndex = text.indexOf(commentEndExpression, startIndex);

        int commentLength;

        if (endIndex == -1) {

            setCurrentBlockState(1);

            commentLength = text.length() - startIndex;

        } else {

            commentLength = endIndex - startIndex

                            + commentEndExpression.matchedLength();

        }

        setFormat(startIndex, commentLength, multiLineCommentFormat);

        startIndex = text.indexOf(commentStartExpression,

                                                startIndex + commentLength);

    }

}