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

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

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

**

** This file is part of the Qt Designer of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** 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 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.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

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

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

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

#include <QtCore/QTextStream>

#include "htmlhighlighter_p.h"

QT_BEGIN_NAMESPACE

namespace qdesigner_internal {

HtmlHighlighter::HtmlHighlighter(QTextEdit *textEdit)

    : QSyntaxHighlighter(textEdit)

{

    QTextCharFormat entityFormat;

    entityFormat.setForeground(Qt::red);

    setFormatFor(Entity, entityFormat);

    QTextCharFormat tagFormat;

    tagFormat.setForeground(Qt::darkMagenta);

    tagFormat.setFontWeight(QFont::Bold);

    setFormatFor(Tag, tagFormat);

    QTextCharFormat commentFormat;

    commentFormat.setForeground(Qt::gray);

    commentFormat.setFontItalic(true);

    setFormatFor(Comment, commentFormat);

    QTextCharFormat attributeFormat;

    attributeFormat.setForeground(Qt::black);

    attributeFormat.setFontWeight(QFont::Bold);

    setFormatFor(Attribute, attributeFormat);

    QTextCharFormat valueFormat;

    valueFormat.setForeground(Qt::blue);

    setFormatFor(Value, valueFormat);

}

void HtmlHighlighter::setFormatFor(Construct construct,

                                   const QTextCharFormat &format)

{

    m_formats[construct] = format;

    rehighlight();

}

void HtmlHighlighter::highlightBlock(const QString &text)

{

    static const QLatin1Char tab = QLatin1Char('\t');

    static const QLatin1Char space = QLatin1Char(' ');

    static const QLatin1Char amp = QLatin1Char('&');

    static const QLatin1Char startTag = QLatin1Char('<');

    static const QLatin1Char endTag = QLatin1Char('>');

    static const QLatin1Char quot = QLatin1Char('"');

    static const QLatin1Char apos = QLatin1Char('\'');

    static const QLatin1Char semicolon = QLatin1Char(';');

    static const QLatin1Char equals = QLatin1Char('=');

    static const QLatin1String startComment = QLatin1String("<!--");

    static const QLatin1String endComment = QLatin1String("-->");

    static const QLatin1String endElement = QLatin1String("/>");

    int state = previousBlockState();

    int len = text.length();

    int start = 0;

    int pos = 0;

    while (pos < len) {

        switch (state) {

        case NormalState:

        default:

            while (pos < len) {

                QChar ch = text.at(pos);

                if (ch == startTag) {

                    if (text.mid(pos, 4) == startComment) {

                        state = InComment;

                    } else {

                        state = InTag;

                        start = pos;

                        while (pos < len && text.at(pos) != space

                               && text.at(pos) != endTag

                               && text.at(pos) != tab

                               && text.mid(pos, 2) != endElement)

                            ++pos;

                        if (text.mid(pos, 2) == endElement)

                            ++pos;

                        setFormat(start, pos - start,

                                  m_formats[Tag]);

                        break;

                    }

                    break;

                } else if (ch == amp) {

                    start = pos;

                    while (pos < len && text.at(pos++) != semicolon)

                        ;

                    setFormat(start, pos - start,

                              m_formats[Entity]);

                } else {

                    // No tag, comment or entity started, continue...

                    ++pos;

                }

            }

            break;

        case InComment:

            start = pos;

            while (pos < len) {

                if (text.mid(pos, 3) == endComment) {

                    pos += 3;

                    state = NormalState;

                    break;

                } else {

                    ++pos;

                }

            }

            setFormat(start, pos - start, m_formats[Comment]);

            break;

        case InTag:

            QChar quote = QChar::Null;

            while (pos < len) {

                QChar ch = text.at(pos);

                if (quote.isNull()) {

                    start = pos;

                    if (ch == apos || ch == quot) {

                        quote = ch;

                    } else if (ch == endTag) {

                        ++pos;

                        setFormat(start, pos - start, m_formats[Tag]);

                        state = NormalState;

                        break;

                    } else if (text.mid(pos, 2) == endElement) {

                        pos += 2;

                        setFormat(start, pos - start, m_formats[Tag]);

                        state = NormalState;

                        break;

                    } else if (ch != space && text.at(pos) != tab) {

                        // Tag not ending, not a quote and no whitespace, so

                        // we must be dealing with an attribute.

                        ++pos;

                        while (pos < len && text.at(pos) != space

                               && text.at(pos) != tab

                               && text.at(pos) != equals)

                            ++pos;

                        setFormat(start, pos - start, m_formats[Attribute]);

                        start = pos;

                    }

                } else if (ch == quote) {

                    quote = QChar::Null;

                    // Anything quoted is a value

                    setFormat(start, pos - start, m_formats[Value]);

                }

                ++pos;

            }

            break;

        }

    }

    setCurrentBlockState(state);

}

} // namespace qdesigner_internal

QT_END_NAMESPACE