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Diffstat (limited to 'src/qt3support/text/q3syntaxhighlighter.cpp')
| -rw-r--r-- | src/qt3support/text/q3syntaxhighlighter.cpp | 223 |
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diff --git a/src/qt3support/text/q3syntaxhighlighter.cpp b/src/qt3support/text/q3syntaxhighlighter.cpp new file mode 100644 index 0000000..a88a75b --- /dev/null +++ b/src/qt3support/text/q3syntaxhighlighter.cpp @@ -0,0 +1,223 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (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 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 "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 |