1 files changed, 343 insertions, 0 deletions
diff --git a/src/declarative/util/qmlstyledtext.cpp b/src/declarative/util/qmlstyledtext.cpp
new file mode 100644
index 0000000..36b5e49
--- /dev/null
+++ b/src/declarative/util/qmlstyledtext.cpp
@@ -0,0 +1,343 @@
+/****************************************************************************
+**
+** 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 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 "qmlstyledtext_p.h"
+
+/*
+    QmlStyledText 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.
+*/
+
+class QmlStyledTextPrivate
+{
+public:
+    QmlStyledTextPrivate(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 QmlStyledTextPrivate::lessThan(QLatin1Char('<'));
+const QChar QmlStyledTextPrivate::greaterThan(QLatin1Char('>'));
+const QChar QmlStyledTextPrivate::equals(QLatin1Char('='));
+const QChar QmlStyledTextPrivate::singleQuote(QLatin1Char('\''));
+const QChar QmlStyledTextPrivate::doubleQuote(QLatin1Char('\"'));
+const QChar QmlStyledTextPrivate::slash(QLatin1Char('/'));
+const QChar QmlStyledTextPrivate::ampersand(QLatin1Char('&'));
+
+QmlStyledText::QmlStyledText(const QString &string, QTextLayout &layout)
+: d(new QmlStyledTextPrivate(string, layout))
+{
+}
+
+QmlStyledText::~QmlStyledText()
+{
+    delete d;
+}
+
+void QmlStyledText::parse(const QString &string, QTextLayout &layout)
+{
+    QmlStyledText styledText(string, layout);
+    styledText.d->parse();
+}
+
+void QmlStyledTextPrivate::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))
+                    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;
+        }
+        ++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 QmlStyledTextPrivate::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);
+                    return true;
+                } else if (tagLength == 2 && tag.at(1) == QLatin1Char('r')) {
+                    textOut.append(QChar(QChar::LineSeparator));
+                    return true;
+                }
+            } else if (char0 == QLatin1Char('i')) {
+                if (tagLength == 1) {
+                    format.setFontItalic(true);
+                    return true;
+                }
+            }
+            return false;
+        } 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 QmlStyledTextPrivate::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 QmlStyledTextPrivate::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 QmlStyledTextPrivate::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> QmlStyledTextPrivate::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 QmlStyledTextPrivate::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);
+}