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Diffstat (limited to 'src/xmlpatterns/api/qxmlformatter.cpp')
| -rw-r--r-- | src/xmlpatterns/api/qxmlformatter.cpp | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/src/xmlpatterns/api/qxmlformatter.cpp b/src/xmlpatterns/api/qxmlformatter.cpp new file mode 100644 index 0000000..0925fe5 --- /dev/null +++ b/src/xmlpatterns/api/qxmlformatter.cpp @@ -0,0 +1,338 @@ +/**************************************************************************** +** +** 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 |