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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the Qt3Support module 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "q3syntaxhighlighter.h"
+#include "q3syntaxhighlighter_p.h"
+
+#ifndef QT_NO_SYNTAXHIGHLIGHTER
+#include "q3textedit.h"
+#include "qtimer.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+ \class Q3SyntaxHighlighter
+ \brief The Q3SyntaxHighlighter class is a base class for
+ implementing Q3TextEdit syntax highlighters.
+
+ \compat
+
+ A syntax highligher automatically highlights parts of the text in
+ a Q3TextEdit. Syntax highlighters are often used when the user is
+ entering text in a specific format (for example, source code) and
+ help the user to read the text and identify syntax errors.
+
+ To provide your own syntax highlighting for Q3TextEdit, you must
+ subclass Q3SyntaxHighlighter and reimplement highlightParagraph().
+
+ When you create an instance of your Q3SyntaxHighlighter subclass,
+ pass it the Q3TextEdit that you want the syntax highlighting to be
+ applied to. After this your highlightParagraph() function will be
+ called automatically whenever necessary. Use your
+ highlightParagraph() function to apply formatting (e.g. setting
+ the font and color) to the text that is passed to it.
+*/
+
+/*!
+ Constructs the Q3SyntaxHighlighter and installs it on \a textEdit.
+ Ownership of the Q3SyntaxHighlighter is transferred to the \a
+ textEdit
+*/
+
+Q3SyntaxHighlighter::Q3SyntaxHighlighter(Q3TextEdit *textEdit)
+ : para(0), edit(textEdit), d(new Q3SyntaxHighlighterPrivate)
+{
+ textEdit->document()->setPreProcessor(new Q3SyntaxHighlighterInternal(this));
+ textEdit->document()->invalidate();
+ QTimer::singleShot(0, textEdit->viewport(), SLOT(update()));
+}
+
+/*!
+ Destructor. Uninstalls this syntax highlighter from the textEdit()
+*/
+
+Q3SyntaxHighlighter::~Q3SyntaxHighlighter()
+{
+ delete d;
+ textEdit()->document()->setPreProcessor(0);
+}
+
+/*!
+ \fn int Q3SyntaxHighlighter::highlightParagraph(const QString &text, int endStateOfLastPara)
+
+ This function is called when necessary by the rich text engine,
+ i.e. on paragraphs which have changed.
+
+ In your reimplementation you should parse the paragraph's \a text
+ and call setFormat() as often as necessary to apply any font and
+ color changes that you require. Your function must return a value
+ which indicates the paragraph's end state: see below.
+
+ Some syntaxes can have constructs that span paragraphs. For
+ example, a C++ syntax highlighter should be able to cope with
+ \c{/}\c{*...*}\c{/} comments that span paragraphs. To deal
+ with these cases it is necessary to know the end state of the
+ previous paragraph (e.g. "in comment").
+
+ If your syntax does not have paragraph spanning constructs, simply
+ ignore the \a endStateOfLastPara parameter and always return 0.
+
+ Whenever highlightParagraph() is called it is passed a value for
+ \a endStateOfLastPara. For the very first paragraph this value is
+ always -2. For any other paragraph the value is the value returned
+ by the most recent highlightParagraph() call that applied to the
+ preceding paragraph.
+
+ The value you return is up to you. We recommend only returning 0
+ (to signify that this paragraph's syntax highlighting does not
+ affect the following paragraph), or a positive integer (to signify
+ that this paragraph has ended in the middle of a paragraph
+ spanning construct).
+
+ To find out which paragraph is highlighted, call
+ currentParagraph().
+
+ For example, if you're writing a simple C++ syntax highlighter,
+ you might designate 1 to signify "in comment". For a paragraph
+ that ended in the middle of a comment you'd return 1, and for
+ other paragraphs you'd return 0. In your parsing code if \a
+ endStateOfLastPara was 1, you would highlight the text as a C++
+ comment until you reached the closing \c{*}\c{/}.
+*/
+
+/*!
+ This function is applied to the syntax highlighter's current
+ paragraph (the text of which is passed to the highlightParagraph()
+ function).
+
+ The specified \a font and \a color are applied to the text from
+ position \a start for \a count characters. (If \a count is 0,
+ nothing is done.)
+*/
+
+void Q3SyntaxHighlighter::setFormat(int start, int count, const QFont &font, const QColor &color)
+{
+ if (!para || count <= 0)
+ return;
+ Q3TextFormat *f = 0;
+ f = para->document()->formatCollection()->format(font, color);
+ para->setFormat(start, count, f);
+ f->removeRef();
+}
+
+/*! \overload */
+
+void Q3SyntaxHighlighter::setFormat(int start, int count, const QColor &color)
+{
+ if (!para || count <= 0)
+ return;
+ Q3TextFormat *f = 0;
+ QFont fnt = textEdit()->QWidget::font();
+ f = para->document()->formatCollection()->format(fnt, color);
+ para->setFormat(start, count, f);
+ f->removeRef();
+}
+
+/*! \overload */
+
+void Q3SyntaxHighlighter::setFormat(int start, int count, const QFont &font)
+{
+ if (!para || count <= 0)
+ return;
+ Q3TextFormat *f = 0;
+ QColor c = textEdit()->viewport()->palette().color(textEdit()->viewport()->foregroundRole());
+ f = para->document()->formatCollection()->format(font, c);
+ para->setFormat(start, count, f);
+ f->removeRef();
+}
+
+/*!
+ \fn Q3TextEdit *Q3SyntaxHighlighter::textEdit() const
+
+ Returns the Q3TextEdit on which this syntax highlighter is
+ installed
+*/
+
+/*! Redoes the highlighting of the whole document.
+*/
+
+void Q3SyntaxHighlighter::rehighlight()
+{
+ Q3TextParagraph *s = edit->document()->firstParagraph();
+ while (s) {
+ s->invalidate(0);
+ s->state = -1;
+ s->needPreProcess = true;
+ s = s->next();
+ }
+ edit->repaintContents();
+}
+
+/*!
+ Returns the id of the paragraph which is highlighted, or -1 of no
+ paragraph is currently highlighted.
+
+ Usually this function is called from within highlightParagraph().
+*/
+
+int Q3SyntaxHighlighter::currentParagraph() const
+{
+ return d->currentParagraph;
+}
+
+QT_END_NAMESPACE
+
+#endif