--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/declarative/util/qdeclarativestyledtext.cpp Thu Jul 22 16:41:55 2010 +0100
@@ -0,0 +1,347 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative 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 <QStack>
+#include <QVector>
+#include <QPainter>
+#include <QTextLayout>
+#include <QDebug>
+#include <qmath.h>
+#include "private/qdeclarativestyledtext_p.h"
+
+/*
+ QDeclarativeStyledText supports few tags:
+
+ <b></b> - bold
+ <i></i> - italic
+ <br> - new line
+ <font color="color_name" size="1-7"></font>
+
+ The opening and closing tags must be correctly nested.
+*/
+
+QT_BEGIN_NAMESPACE
+
+class QDeclarativeStyledTextPrivate
+{
+public:
+ QDeclarativeStyledTextPrivate(const QString &t, QTextLayout &l) : text(t), layout(l), baseFont(layout.font()) {}
+
+ void parse();
+ bool parseTag(const QChar *&ch, const QString &textIn, QString &textOut, QTextCharFormat &format);
+ bool parseCloseTag(const QChar *&ch, const QString &textIn);
+ void parseEntity(const QChar *&ch, const QString &textIn, QString &textOut);
+ bool parseFontAttributes(const QChar *&ch, const QString &textIn, QTextCharFormat &format);
+ QPair<QStringRef,QStringRef> parseAttribute(const QChar *&ch, const QString &textIn);
+ QStringRef parseValue(const QChar *&ch, const QString &textIn);
+
+ inline void skipSpace(const QChar *&ch) {
+ while (ch->isSpace() && !ch->isNull())
+ ++ch;
+ }
+
+ QString text;
+ QTextLayout &layout;
+ QFont baseFont;
+
+ static const QChar lessThan;
+ static const QChar greaterThan;
+ static const QChar equals;
+ static const QChar singleQuote;
+ static const QChar doubleQuote;
+ static const QChar slash;
+ static const QChar ampersand;
+};
+
+const QChar QDeclarativeStyledTextPrivate::lessThan(QLatin1Char('<'));
+const QChar QDeclarativeStyledTextPrivate::greaterThan(QLatin1Char('>'));
+const QChar QDeclarativeStyledTextPrivate::equals(QLatin1Char('='));
+const QChar QDeclarativeStyledTextPrivate::singleQuote(QLatin1Char('\''));
+const QChar QDeclarativeStyledTextPrivate::doubleQuote(QLatin1Char('\"'));
+const QChar QDeclarativeStyledTextPrivate::slash(QLatin1Char('/'));
+const QChar QDeclarativeStyledTextPrivate::ampersand(QLatin1Char('&'));
+
+QDeclarativeStyledText::QDeclarativeStyledText(const QString &string, QTextLayout &layout)
+: d(new QDeclarativeStyledTextPrivate(string, layout))
+{
+}
+
+QDeclarativeStyledText::~QDeclarativeStyledText()
+{
+ delete d;
+}
+
+void QDeclarativeStyledText::parse(const QString &string, QTextLayout &layout)
+{
+ if (string.isEmpty())
+ return;
+ QDeclarativeStyledText styledText(string, layout);
+ styledText.d->parse();
+}
+
+void QDeclarativeStyledTextPrivate::parse()
+{
+ QList<QTextLayout::FormatRange> ranges;
+ QStack<QTextCharFormat> formatStack;
+
+ QString drawText;
+ drawText.reserve(text.count());
+
+ int textStart = 0;
+ int textLength = 0;
+ int rangeStart = 0;
+ const QChar *ch = text.constData();
+ while (!ch->isNull()) {
+ if (*ch == lessThan) {
+ if (textLength)
+ drawText.append(QStringRef(&text, textStart, textLength));
+ if (rangeStart != drawText.length() && formatStack.count()) {
+ QTextLayout::FormatRange formatRange;
+ formatRange.format = formatStack.top();
+ formatRange.start = rangeStart;
+ formatRange.length = drawText.length() - rangeStart;
+ ranges.append(formatRange);
+ }
+ rangeStart = drawText.length();
+ ++ch;
+ if (*ch == slash) {
+ ++ch;
+ if (parseCloseTag(ch, text)) {
+ if (formatStack.count())
+ formatStack.pop();
+ }
+ } else {
+ QTextCharFormat format;
+ if (formatStack.count())
+ format = formatStack.top();
+ else
+ format.setFont(baseFont);
+ if (parseTag(ch, text, drawText, format))
+ formatStack.push(format);
+ }
+ textStart = ch - text.constData() + 1;
+ textLength = 0;
+ } else if (*ch == ampersand) {
+ ++ch;
+ drawText.append(QStringRef(&text, textStart, textLength));
+ parseEntity(ch, text, drawText);
+ textStart = ch - text.constData() + 1;
+ textLength = 0;
+ } else {
+ ++textLength;
+ }
+ if (!ch->isNull())
+ ++ch;
+ }
+ if (textLength)
+ drawText.append(QStringRef(&text, textStart, textLength));
+ if (rangeStart != drawText.length() && formatStack.count()) {
+ QTextLayout::FormatRange formatRange;
+ formatRange.format = formatStack.top();
+ formatRange.start = rangeStart;
+ formatRange.length = drawText.length() - rangeStart;
+ ranges.append(formatRange);
+ }
+
+ layout.setText(drawText);
+ layout.setAdditionalFormats(ranges);
+}
+
+bool QDeclarativeStyledTextPrivate::parseTag(const QChar *&ch, const QString &textIn, QString &textOut, QTextCharFormat &format)
+{
+ skipSpace(ch);
+
+ int tagStart = ch - textIn.constData();
+ int tagLength = 0;
+ while (!ch->isNull()) {
+ if (*ch == greaterThan) {
+ QStringRef tag(&textIn, tagStart, tagLength);
+ const QChar char0 = tag.at(0);
+ if (char0 == QLatin1Char('b')) {
+ if (tagLength == 1)
+ format.setFontWeight(QFont::Bold);
+ else if (tagLength == 2 && tag.at(1) == QLatin1Char('r'))
+ textOut.append(QChar(QChar::LineSeparator));
+ } else if (char0 == QLatin1Char('i')) {
+ if (tagLength == 1)
+ format.setFontItalic(true);
+ }
+ return true;
+ } else if (ch->isSpace()) {
+ // may have params.
+ QStringRef tag(&textIn, tagStart, tagLength);
+ if (tag == QLatin1String("font"))
+ return parseFontAttributes(ch, textIn, format);
+ if (*ch == greaterThan || ch->isNull())
+ continue;
+ } else if (*ch != slash){
+ tagLength++;
+ }
+ ++ch;
+ }
+
+ return false;
+}
+
+bool QDeclarativeStyledTextPrivate::parseCloseTag(const QChar *&ch, const QString &textIn)
+{
+ skipSpace(ch);
+
+ int tagStart = ch - textIn.constData();
+ int tagLength = 0;
+ while (!ch->isNull()) {
+ if (*ch == greaterThan) {
+ QStringRef tag(&textIn, tagStart, tagLength);
+ const QChar char0 = tag.at(0);
+ if (char0 == QLatin1Char('b')) {
+ if (tagLength == 1)
+ return true;
+ else if (tag.at(1) == QLatin1Char('r') && tagLength == 2)
+ return true;
+ } else if (char0 == QLatin1Char('i')) {
+ if (tagLength == 1)
+ return true;
+ } else if (tag == QLatin1String("font")) {
+ return true;
+ }
+ return false;
+ } else if (!ch->isSpace()){
+ tagLength++;
+ }
+ ++ch;
+ }
+
+ return false;
+}
+
+void QDeclarativeStyledTextPrivate::parseEntity(const QChar *&ch, const QString &textIn, QString &textOut)
+{
+ int entityStart = ch - textIn.constData();
+ int entityLength = 0;
+ while (!ch->isNull()) {
+ if (*ch == QLatin1Char(';')) {
+ QStringRef entity(&textIn, entityStart, entityLength);
+ if (entity == QLatin1String("gt"))
+ textOut += QChar(62);
+ else if (entity == QLatin1String("lt"))
+ textOut += QChar(60);
+ else if (entity == QLatin1String("amp"))
+ textOut += QChar(38);
+ return;
+ }
+ ++entityLength;
+ ++ch;
+ }
+}
+
+bool QDeclarativeStyledTextPrivate::parseFontAttributes(const QChar *&ch, const QString &textIn, QTextCharFormat &format)
+{
+ bool valid = false;
+ QPair<QStringRef,QStringRef> attr;
+ do {
+ attr = parseAttribute(ch, textIn);
+ if (attr.first == QLatin1String("color")) {
+ valid = true;
+ format.setForeground(QColor(attr.second.toString()));
+ } else if (attr.first == QLatin1String("size")) {
+ valid = true;
+ int size = attr.second.toString().toInt();
+ if (attr.second.at(0) == QLatin1Char('-') || attr.second.at(0) == QLatin1Char('+'))
+ size += 3;
+ if (size >= 1 && size <= 7) {
+ static const qreal scaling[] = { 0.7, 0.8, 1.0, 1.2, 1.5, 2.0, 2.4 };
+ format.setFontPointSize(baseFont.pointSize() * scaling[size-1]);
+ }
+ }
+ } while (!ch->isNull() && !attr.first.isEmpty());
+
+ return valid;
+}
+
+QPair<QStringRef,QStringRef> QDeclarativeStyledTextPrivate::parseAttribute(const QChar *&ch, const QString &textIn)
+{
+ skipSpace(ch);
+
+ int attrStart = ch - textIn.constData();
+ int attrLength = 0;
+ while (!ch->isNull()) {
+ if (*ch == greaterThan) {
+ break;
+ } else if (*ch == equals) {
+ ++ch;
+ if (*ch != singleQuote && *ch != doubleQuote) {
+ while (*ch != greaterThan && !ch->isNull())
+ ++ch;
+ break;
+ }
+ ++ch;
+ if (!attrLength)
+ break;
+ QStringRef attr(&textIn, attrStart, attrLength);
+ QStringRef val = parseValue(ch, textIn);
+ if (!val.isEmpty())
+ return QPair<QStringRef,QStringRef>(attr,val);
+ break;
+ } else {
+ ++attrLength;
+ }
+ ++ch;
+ }
+
+ return QPair<QStringRef,QStringRef>();
+}
+
+QStringRef QDeclarativeStyledTextPrivate::parseValue(const QChar *&ch, const QString &textIn)
+{
+ int valStart = ch - textIn.constData();
+ int valLength = 0;
+ while (*ch != singleQuote && *ch != doubleQuote && !ch->isNull()) {
+ ++valLength;
+ ++ch;
+ }
+ if (ch->isNull())
+ return QStringRef();
+ ++ch; // skip quote
+
+ return QStringRef(&textIn, valStart, valLength);
+}
+
+QT_END_NAMESPACE