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/****************************************************************************
**
** Implementation of the QSyntaxHighlighter class
**
** Created : 990101
**
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the widgets module of the Qt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
** included in the packaging of this file. Licensees holding valid Qt
** Commercial licenses may use this file in accordance with the Qt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#include "qsyntaxhighlighter.h"
#include "private/qsyntaxhighlighter_p.h"
#ifndef QT_NO_SYNTAXHIGHLIGHTER
#include "../kernel/qrichtext_p.h"
#include "qtextedit.h"
#include "qtimer.h"
/*!
\class QSyntaxHighlighter qsyntaxhighlighter.h
\brief The QSyntaxHighlighter class is a base class for
implementing QTextEdit syntax highlighters.
\ingroup basic
\ingroup text
A syntax highligher automatically highlights parts of the text in
a QTextEdit. 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 QTextEdit, you must
subclass QSyntaxHighlighter and reimplement highlightParagraph().
When you create an instance of your QSyntaxHighlighter subclass,
pass it the QTextEdit 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 QSyntaxHighlighter and installs it on \a textEdit.
It is the caller's responsibility to delete the
QSyntaxHighlighter when it is no longer needed.
*/
QSyntaxHighlighter::QSyntaxHighlighter( QTextEdit *textEdit )
: para( 0 ), edit( textEdit ), d( new QSyntaxHighlighterPrivate )
{
textEdit->document()->setPreProcessor( new QSyntaxHighlighterInternal( this ) );
textEdit->document()->invalidate();
QTimer::singleShot( 0, textEdit->viewport(), SLOT( update() ) );
}
/*!
Destructor. Uninstalls this syntax highlighter from the textEdit()
*/
QSyntaxHighlighter::~QSyntaxHighlighter()
{
delete d;
textEdit()->document()->setPreProcessor( 0 );
}
/*!
\fn int QSyntaxHighlighter::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 QSyntaxHighlighter::setFormat( int start, int count, const QFont &font, const QColor &color )
{
if ( !para || count <= 0 )
return;
QTextFormat *f = 0;
f = para->document()->formatCollection()->format( font, color );
para->setFormat( start, count, f );
f->removeRef();
}
/*! \overload */
void QSyntaxHighlighter::setFormat( int start, int count, const QColor &color )
{
if ( !para || count <= 0 )
return;
QTextFormat *f = 0;
QFont fnt = textEdit()->QWidget::font();
f = para->document()->formatCollection()->format( fnt, color );
para->setFormat( start, count, f );
f->removeRef();
}
/*! \overload */
void QSyntaxHighlighter::setFormat( int start, int count, const QFont &font )
{
if ( !para || count <= 0 )
return;
QTextFormat *f = 0;
QColor c = textEdit()->viewport()->paletteForegroundColor();
f = para->document()->formatCollection()->format( font, c );
para->setFormat( start, count, f );
f->removeRef();
}
/*!
\fn QTextEdit *QSyntaxHighlighter::textEdit() const
Returns the QTextEdit on which this syntax highlighter is
installed
*/
/*! Redoes the highlighting of the whole document.
*/
void QSyntaxHighlighter::rehighlight()
{
QTextParagraph *s = edit->document()->firstParagraph();
while ( s ) {
s->invalidate( 0 );
s->state = -1;
s->needPreProcess = TRUE;
s = s->next();
}
edit->repaintContents( FALSE );
}
/*!
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 QSyntaxHighlighter::currentParagraph() const
{
return d->currentParagraph;
}
#endif
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