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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 338 insertions, 0 deletions

diff --git a/src/xmlpatterns/api/qxmlformatter.cpp b/src/xmlpatterns/api/qxmlformatter.cpp
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+/****************************************************************************
+**
+** 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 QtXmlPatterns 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 <QtDebug>
+
+#include "qxmlformatter.h"
+#include "qxpathhelper_p.h"
+#include "qxmlserializer_p.h"
+
+QT_BEGIN_NAMESPACE
+
+using namespace QPatternist;
+
+class QXmlFormatterPrivate : public QXmlSerializerPrivate
+{
+public:
+    inline QXmlFormatterPrivate(const QXmlQuery &q,
+                                QIODevice *const outputDevice);
+
+    int             indentationDepth;
+    int             currentDepth;
+    QString         characterBuffer;
+    QString         indentString;
+
+    /**
+     * Whether we /have/ sent nodes like processing instructions and comments
+     * to QXmlSerializer.
+     */
+    QStack<bool>    canIndent;
+};
+
+QXmlFormatterPrivate::QXmlFormatterPrivate(const QXmlQuery &query,
+                                           QIODevice *const outputDevice) : QXmlSerializerPrivate(query, outputDevice)
+                                                                          , indentationDepth(4)
+                                                                          , currentDepth(0)
+{
+    indentString.reserve(30);
+    indentString.resize(1);
+    indentString[0] = QLatin1Char('\n');
+    canIndent.push(false);
+}
+
+/*!
+   \class QXmlFormatter
+   \brief The QXmlFormatter class is an implementation of QXmlSerializer for transforming XQuery output into formatted XML.
+   \reentrant
+   \since 4.4
+   \ingroup xml-tools
+
+   QXmlFormatter is a subclass of QXmlSerializer that formats the XML
+   output to make it easier for humans to read.
+
+   QXmlSerializer outputs XML without adding unnecessary whitespace.
+   In particular, it does not add \e {newlines} and indentation.
+   To make the XML output easier to read, QXmlFormatter adds \e{newlines}
+   and indentation by adding, removing, and modifying
+   \l{XQuery Sequence}{sequence nodes} that only consist of whitespace.
+   It also modifies whitespace in other places where it is not
+   significant; e.g., between attributes and in the document prologue.
+
+   For example, where the base class QXmlSerializer would
+   output this:
+
+   \quotefile doc/src/snippets/patternist/notIndented.xml
+
+   QXmlFormatter outputs this:
+
+   \quotefile doc/src/snippets/patternist/indented.xml
+
+   If you just want to serialize your XML in a human-readable
+   format, use QXmlFormatter as it is. The default indentation
+   level is 4 spaces, but you can set your own indentation value
+   setIndentationDepth().
+
+   The \e{newlines} and indentation added by QXmlFormatter are
+   suitable for common formats, such as XHTML, SVG, or Docbook,
+   where whitespace is not significant. However, if your XML will
+   be used as input where whitespace is significant, then you must
+   write your own subclass of QXmlSerializer or QAbstractXmlReceiver.
+
+   Note that using QXmlFormatter instead of QXmlSerializer will
+   increase computational overhead and document storage size due
+   to the insertion of whitespace.
+
+   Note also that the indentation style used by QXmlFormatter
+   remains loosely defined and may change in future versions of
+   Qt. If a specific indentation style is required then either
+   use the base class QXmlSerializer directly, or write your own
+   subclass of QXmlSerializer or QAbstractXmlReceiver.
+   Alternatively, you can subclass QXmlFormatter and reimplement
+   the callbacks there.
+
+   \snippet doc/src/snippets/code/src_xmlpatterns_api_qxmlformatter.cpp 0
+*/
+
+/*!
+  Constructs a formatter that uses the name pool and message
+  handler in \a query, and writes the result to \a outputDevice
+  as formatted XML.
+
+  \a outputDevice is passed directly to QXmlSerializer's constructor.
+
+  \sa QXmlSerializer
+ */
+QXmlFormatter::QXmlFormatter(const QXmlQuery &query,
+                             QIODevice *outputDevice) : QXmlSerializer(new QXmlFormatterPrivate(query, outputDevice))
+{
+}
+
+/*!
+  \internal
+ */
+void QXmlFormatter::startFormattingContent()
+{
+    Q_D(QXmlFormatter);
+
+    if(QPatternist::XPathHelper::isWhitespaceOnly(d->characterBuffer))
+    {
+        if(d->canIndent.top())
+            QXmlSerializer::characters(QStringRef(&d->indentString));
+    }
+    else
+    {
+        if(!d->characterBuffer.isEmpty()) /* Significant data, we don't touch it. */
+            QXmlSerializer::characters(QStringRef(&d->characterBuffer));
+    }
+
+    d->characterBuffer.clear();
+}
+
+/*!
+  \reimp
+ */
+void QXmlFormatter::startElement(const QXmlName &name)
+{
+    Q_D(QXmlFormatter);
+    startFormattingContent();
+    ++d->currentDepth;
+    d->indentString.append(QString(d->indentationDepth, QLatin1Char(' ')));
+    d->canIndent.push(true);
+
+    QXmlSerializer::startElement(name);
+}
+
+/*!
+  \reimp
+ */
+void QXmlFormatter::endElement()
+{
+    Q_D(QXmlFormatter);
+    --d->currentDepth;
+    d->indentString.chop(d->indentationDepth);
+
+    if(!d->hasClosedElement.top().second)
+        d->canIndent.top() = false;
+
+    startFormattingContent();
+
+    d->canIndent.pop();
+    d->canIndent.top() = true;
+    QXmlSerializer::endElement();
+}
+
+/*!
+  \reimp
+ */
+void QXmlFormatter::attribute(const QXmlName &name,
+                              const QStringRef &value)
+{
+    QXmlSerializer::attribute(name, value);
+}
+
+/*!
+ \reimp
+ */
+void QXmlFormatter::comment(const QString &value)
+{
+    Q_D(QXmlFormatter);
+    startFormattingContent();
+    QXmlSerializer::comment(value);
+    d->canIndent.top() = true;
+}
+
+/*!
+ \reimp
+ */
+void QXmlFormatter::characters(const QStringRef &value)
+{
+    Q_D(QXmlFormatter);
+    d->isPreviousAtomic = false;
+    d->characterBuffer += value.toString();
+}
+
+/*!
+ \reimp
+ */
+void QXmlFormatter::processingInstruction(const QXmlName &name,
+                                          const QString &value)
+{
+    Q_D(QXmlFormatter);
+    startFormattingContent();
+    QXmlSerializer::processingInstruction(name, value);
+    d->canIndent.top() = true;
+}
+
+/*!
+ \reimp
+ */
+void QXmlFormatter::atomicValue(const QVariant &value)
+{
+    Q_D(QXmlFormatter);
+    d->canIndent.top() = false;
+    QXmlSerializer::atomicValue(value);
+}
+
+/*!
+ \reimp
+ */
+void QXmlFormatter::startDocument()
+{
+    QXmlSerializer::startDocument();
+}
+
+/*!
+ \reimp
+ */
+void QXmlFormatter::endDocument()
+{
+    QXmlSerializer::endDocument();
+}
+
+/*!
+ \reimp
+ */
+void QXmlFormatter::startOfSequence()
+{
+    QXmlSerializer::startOfSequence();
+}
+
+/*!
+ \reimp
+ */
+void QXmlFormatter::endOfSequence()
+{
+    Q_D(QXmlFormatter);
+
+    /* Flush any buffered content. */
+    if(!d->characterBuffer.isEmpty())
+        QXmlSerializer::characters(QStringRef(&d->characterBuffer));
+
+    d->write('\n');
+    QXmlSerializer::endOfSequence();
+}
+
+/*!
+ \internal
+ */
+void QXmlFormatter::item(const QPatternist::Item &item)
+{
+    Q_D(QXmlFormatter);
+
+    if(item.isAtomicValue())
+    {
+        if(QPatternist::XPathHelper::isWhitespaceOnly(item.stringValue()))
+           return;
+        else
+        {
+            d->canIndent.top() = false;
+            startFormattingContent();
+        }
+    }
+
+    QXmlSerializer::item(item);
+}
+
+/*!
+  Returns the number of spaces QXmlFormatter will output for each
+  indentation level. The default is four.
+
+ \sa setIndentationDepth()
+ */
+int QXmlFormatter::indentationDepth() const
+{
+    Q_D(const QXmlFormatter);
+    return d->indentationDepth;
+}
+
+/*!
+  Sets \a depth to be the number of spaces QXmlFormatter will
+  output for level of indentation. The default is four.
+
+ \sa indentationDepth()
+ */
+void QXmlFormatter::setIndentationDepth(int depth)
+{
+    Q_D(QXmlFormatter);
+    d->indentationDepth = depth;
+}
+
+QT_END_NAMESPACE