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Diffstat (limited to 'tests/auto/xmlpatternssdk/XMLWriter.cpp')
| -rw-r--r-- | tests/auto/xmlpatternssdk/XMLWriter.cpp | 669 |
1 files changed, 669 insertions, 0 deletions
diff --git a/tests/auto/xmlpatternssdk/XMLWriter.cpp b/tests/auto/xmlpatternssdk/XMLWriter.cpp new file mode 100644 index 0000000..b13db10 --- /dev/null +++ b/tests/auto/xmlpatternssdk/XMLWriter.cpp @@ -0,0 +1,669 @@ +/**************************************************************************** +** +** 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 test suite 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 <QCoreApplication> +#include <QDateTime> +#include <QIODevice> +#include <QList> +#include <QPair> +#include <QStack> +#include <QtDebug> + +#include "XMLWriter.h" + +/* Issues: + * - Switch to Qt's d-pointer semantics, if in Qt. + * - Remove namespace(PatternistSDK), and change name, if in Qt. + * - Is it really necessary to pass the tag name to endElement()? + * - Could it be of interest to let the user control the encoding? Are those cases common + * enough to justify support in Qt? Using anything but UTF-8 or UTF-16 + * means asking for trouble, from an interoperability perspective. + */ + +/* Design rationalis, comments: + * + * - The class is called XMLWriter to harvest familarity by being consistent with + * Java's XMLWriter class. If XMLWriter is moved to Qt, the name QXmlWriter is perhaps suitable. + * - The class does not handle indentation because the "do one thing well"-principle is + * in use. XMLWriter should be fast and not assume a certain idea of indentation. Indentation + * should be implemented in a standalone QXmlContentHandler that performs the indentation and + * "has a" QXmlContentHandler which it in addition calls, and by that proxying/piping another + * QXmlContentHandler(which most likely is an XMLWriter). Thus, achieving a modularized, + * flexibly approach to indentation. A reason is also that indentation is very subjective. + * The indenter class should probably be called XMLIndenter/QXmlIndenter. + * - It could be of interest to implement QXmlDTDHandler such that it would be possible to serialize + * DTDs. Must be done before BC becomes significant. + * - I think the most valuable of this class is its Q_ASSERT tests. Many programmers have severe problems + * producing XML, and the tests helps them catching their mistakes. They therefore promote + * interoperability. Do not remove them. If any are wrong, fix them instead. + */ + +using namespace QPatternistSDK; + +/** + * A namespace binding, prefix/namespace URI. + */ +typedef QPair<QString, QString> NSBinding; +typedef QList<NSBinding> NSBindingList; + +#ifdef QT_NO_DEBUG +# define DEBUG_CODE(code) +#else +# define DEBUG_CODE(code) code +#endif + +class XMLWriter::Private +{ +public: + inline Private(QIODevice *devP) : insideCDATA(false), + addModificationNote(false), + dev(devP) + { + hasContentStack.push(true); + } + +#ifdef QT_NO_DEBUG + inline void validateQName(const QString &) const + { + } + + inline void verifyNS(const QString &) const + { + } +#else + /** + * Simple test of that @p name is an acceptable QName. + */ + inline void validateQName(const QString &name) + { + Q_ASSERT_X(!name.isEmpty(), Q_FUNC_INFO, + "An XML name cannot be empty."); + Q_ASSERT_X(!name.endsWith(QLatin1Char(':')), Q_FUNC_INFO, + "An XML name cannot end with a colon(QLatin1Char(':'))."); + Q_ASSERT_X(!name.contains(QRegExp(QLatin1String("[ \t\n]"))), Q_FUNC_INFO, + "An XML name cannot contain whitespace."); + } + + /** + * Ensures that the prefix of @p qName is declared. + */ + inline void verifyNS(const QString &qName) const + { + const QString prefix(qName.left(qName.indexOf(QLatin1Char(':')))); + + if(qName.contains(QLatin1Char(':')) && prefix != QLatin1String("xml")) + { + bool foundPrefix = false; + const QStack<NSBindingList>::const_iterator end(namespaceTracker.constEnd()); + QStack<NSBindingList>::const_iterator it(namespaceTracker.constBegin()); + + for(; it != end; ++it) + { + const NSBindingList::const_iterator lend((*it).constEnd()); + NSBindingList::const_iterator lit((*it).constBegin()); + + for(; lit != lend; ++it) + { + if((*lit).first == prefix) + { + foundPrefix = true; + break; + } + } + if(foundPrefix) + break; + } + + Q_ASSERT_X(foundPrefix, "XMLWriter::startElement()", + qPrintable(QString::fromLatin1("The prefix %1 is not declared. All prefixes " + "except 'xml' must be declared.").arg(prefix))); + } + } +#endif + + inline QString escapeElementContent(const QString &ch) + { + const int l = ch.length(); + QString retval; + + for(int i = 0; i != l; ++i) + { + const QChar c(ch.at(i)); + + if(c == QLatin1Char(QLatin1Char('&'))) + retval += QLatin1String("&"); + else if(c == QLatin1Char(QLatin1Char('<'))) + retval += QLatin1String("<"); + else + retval += c; + } + + return retval; + } + + inline QString escapeAttributeContent(const QString &ch) + { + const int l = ch.length(); + QString retval; + + for(int i = 0; i != l; ++i) + { + const QChar c(ch.at(i)); + + /* We don't have to escape '\'' because we use '\"' as attribute delimiter. */ + if(c == QLatin1Char('&')) + retval += QLatin1String("&"); + else if(c == QLatin1Char('<')) + retval += QLatin1String("<"); + else if(c == QLatin1Char('"')) + retval += QLatin1String("""); + else + retval += c; + } + + return retval; + } + + inline QString escapeCDATAContent(const QString &ch) + { + const int l = ch.length(); + QString retval; + qint8 atEnd = 0; + + for(int i = 0; i != l; ++i) + { + const QChar c(ch.at(i)); + + /* Escape '>' if in "]]>" */ + if(c == QLatin1Char(']')) + { + if(atEnd == 0 || atEnd == 1) + ++atEnd; + else + atEnd = 0; + + retval += QLatin1Char(']'); + } + else if(c == QLatin1Char('>')) + { + if(atEnd == 2) + retval += QLatin1String(">"); + else + { + atEnd = 0; + retval += QLatin1Char('>'); + } + } + else + retval += c; + } + + return retval; + } + + /** + * We wrap dev in this function such that we can deploy the Q_ASSERT_X + * macro in each place it's used. + */ + inline QIODevice *device() const + { + Q_ASSERT_X(dev, Q_FUNC_INFO, + "No device specified for XMLWriter; one must be specified with " + "setDevice() or via the constructor before XMLWriter can be used."); + return dev; + } + + /** + * @returns true on success, otherwise false + */ + inline bool serialize(const QString &data) + { + const QByteArray utf8(data.toUtf8()); + + return device()->write(utf8) == utf8.size(); + } + + /** + * @returns true on success, otherwise false + */ + inline bool serialize(const char data) + { + return device()->putChar(data); + } + + /** + * @returns true on success, otherwise false + */ + inline bool serialize(const char *data) + { + return device()->write(data) == qstrlen(data); + } + + inline bool hasElementContent() const + { + return hasContentStack.top(); + } + + inline void handleElement() + { + if(!hasElementContent()) + serialize('>'); + + /* This element is content for the parent. */ + hasContentStack.top() = true; + } + + NSBindingList namespaces; + bool insideCDATA; + bool addModificationNote; + QString msg; + QIODevice *dev; + QStack<bool> hasContentStack; + QString errorString; + DEBUG_CODE(QStack<QString> tags;) + DEBUG_CODE(QStack<NSBindingList> namespaceTracker;) +}; + +/** + * Reduces complexity. The empty else clause is for avoiding mess when macro + * is used in the 'then' branch of an if clause, which is followed by an else clause. + */ +#define serialize(string) if(!d->serialize(string)) \ + { \ + d->errorString = d->device()->errorString(); \ + return false; \ + } \ + else do {} while (false) + +XMLWriter::XMLWriter(QIODevice *outStream) : d(new Private(outStream)) +{ +} + +XMLWriter::~XMLWriter() +{ + delete d; +} + +bool XMLWriter::startDocument() +{ + if(!device()->isOpen() && !device()->open(QIODevice::WriteOnly)) + return false; + + if(d->addModificationNote) + { + if(d->msg.isNull()) + { + d->msg = QString::fromLatin1("NOTE: This file was automatically generated " + "by %1 at %2. All changes to this file will be lost.") + .arg(QCoreApplication::instance()->applicationName(), + QDateTime::currentDateTime().toString()); + } + if(!comment(d->msg)) + return false; + + serialize('\n'); + } + + serialize(QLatin1String("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")); + + return true; +} + +bool XMLWriter::startElement(const QString &/*namespaceURI*/, + const QString &/*localName*/, + const QString &qName, + const QXmlAttributes &atts) +{ + return startElement(qName, atts); +} + +bool XMLWriter::startElement(const QString &qName, + const QXmlAttributes &atts) +{ + Q_ASSERT_X(!d->insideCDATA, Q_FUNC_INFO, + "Only characters() can be received when inside CDATA."); + Q_ASSERT_X(!qName.startsWith(QLatin1String("xmlns")), Q_FUNC_INFO, + "startElement should not be used for declaring prefixes, " + "use startPrefixMapping() for that."); + + d->validateQName(qName); + d->verifyNS(qName); + + d->handleElement(); + + serialize('<'); + serialize(qName); + + DEBUG_CODE(d->tags.push(qName)); + DEBUG_CODE(d->namespaceTracker.push(d->namespaces)); + + /* Add namespace declarations. */ + const NSBindingList::const_iterator end(d->namespaces.constEnd()); + NSBindingList::const_iterator it(d->namespaces.constBegin()); + + for(; it != end; ++it) + { + if((*it).first.isEmpty()) + serialize(" xmlns="); + else + { + serialize(" xmlns:"); + serialize((*it).first); + serialize('='); + } + + serialize('"'); + serialize(d->escapeElementContent((*it).second)); + serialize('"'); + } + d->namespaces.clear(); + + const int c = atts.count(); + + /* Serialize attributes. */ + for(int i = 0; i != c; ++i) + { + d->validateQName(atts.qName(i)); + d->verifyNS(atts.qName(i)); + + serialize(' '); + serialize(atts.qName(i)); + serialize("=\""); + serialize(d->escapeAttributeContent(atts.value(i))); + serialize('"'); + } + + d->hasContentStack.push(false); + return true; +} + +bool XMLWriter::endElement(const QString &/*namespaceURI*/, + const QString &/*localName*/, + const QString &qName) +{ + return endElement(qName); +} + +bool XMLWriter::endElement(const QString &qName) +{ + Q_ASSERT_X(!d->insideCDATA, Q_FUNC_INFO, + "Only characters() can be received when inside CDATA."); + Q_ASSERT_X(d->tags.pop() == qName, Q_FUNC_INFO, + "The element tags are not balanced, the produced XML is invalid."); + + DEBUG_CODE(d->namespaceTracker.pop()); + + /* "this" element is content for our parent, so ensure hasElementContent is true. */ + + if(d->hasElementContent()) + { + serialize(QLatin1String("</")); + serialize(qName); + serialize('>'); + } + else + serialize(QLatin1String("/>")); + + d->hasContentStack.pop(); + + return true; +} + +bool XMLWriter::startPrefixMapping(const QString &prefix, const QString &uri) +{ + Q_ASSERT_X(!d->insideCDATA, Q_FUNC_INFO, + "Only characters() can be received when inside CDATA."); + Q_ASSERT_X(prefix.toLower() != QLatin1String("xml") || + (prefix.toLower() == QLatin1String("xml") && + (uri == QLatin1String("http://www.w3.org/TR/REC-xml-names/") || + uri.isEmpty())), + Q_FUNC_INFO, + "The prefix 'xml' can only be bound to the namespace " + "\"http://www.w3.org/TR/REC-xml-names/\"."); + Q_ASSERT_X(prefix.toLower() != QLatin1String("xml") && + uri != QLatin1String("http://www.w3.org/TR/REC-xml-names/"), + Q_FUNC_INFO, + "The namespace \"http://www.w3.org/TR/REC-xml-names/\" can only be bound to the " + "\"xml\" prefix."); + + d->namespaces.append(qMakePair(prefix, uri)); + return true; +} + +bool XMLWriter::processingInstruction(const QString &target, + const QString &data) +{ + Q_ASSERT_X(target.toLower() != QLatin1String("xml"), Q_FUNC_INFO, + "A processing instruction cannot have the name xml in any " + "capitalization, because it is reserved."); + Q_ASSERT_X(!data.contains(QLatin1String("?>")), Q_FUNC_INFO, + "The content of a processing instruction cannot contain the string \"?>\"."); + Q_ASSERT_X(!d->insideCDATA, "XMLWriter::processingInstruction()", + "Only characters() can be received when inside CDATA."); + + d->handleElement(); + + serialize(QLatin1String("<?")); + serialize(target); + serialize(' '); + serialize(data); + serialize(QLatin1String("?>")); + return true; +} + +bool XMLWriter::characters(const QString &ch) +{ + Q_ASSERT_X(d->tags.count() >= 1, Q_FUNC_INFO, + "Text nodes can only appear inside elements(no elements sent)."); + d->handleElement(); + + if(d->insideCDATA) + serialize(d->escapeCDATAContent(ch)); + else + serialize(d->escapeElementContent(ch)); + + return true; +} + +bool XMLWriter::comment(const QString &ch) +{ + Q_ASSERT_X(!d->insideCDATA, Q_FUNC_INFO, + "Only characters() can be received when inside CDATA."); + Q_ASSERT_X(!ch.contains(QLatin1String("--")), Q_FUNC_INFO, + "XML comments may not contain double-hyphens(\"--\")."); + Q_ASSERT_X(!ch.endsWith(QLatin1Char('-')), Q_FUNC_INFO, + "XML comments cannot end with a hyphen, \"-\"(add a space, for example)."); + /* A comment starting with "<!---" is ok. */ + + d->handleElement(); + + serialize(QLatin1String("<!--")); + serialize(ch); + serialize(QLatin1String("-->")); + + return true; +} + +bool XMLWriter::startCDATA() +{ + Q_ASSERT_X(d->insideCDATA, Q_FUNC_INFO, + "startCDATA() has already been called."); + Q_ASSERT_X(d->tags.count() >= 1, Q_FUNC_INFO, + "CDATA sections can only appear inside elements(no elements sent)."); + d->insideCDATA = true; + serialize(QLatin1String("<![CDATA[")); + return true; +} + +bool XMLWriter::endCDATA() +{ + d->insideCDATA = false; + serialize("]]>"); + return true; +} + +bool XMLWriter::startDTD(const QString &name, + const QString &publicId, + const QString &systemId) +{ + Q_ASSERT_X(!d->insideCDATA, Q_FUNC_INFO, + "Only characters() can be received when inside CDATA."); + Q_ASSERT_X(!name.isEmpty(), Q_FUNC_INFO, + "The DOCTYPE name cannot be empty."); + Q_ASSERT_X(d->tags.isEmpty() && d->namespaces.isEmpty(), Q_FUNC_INFO, + "No content such as namespace declarations or elements can be serialized " + "before the DOCTYPE declaration, the XML is invalid."); + Q_ASSERT_X(!publicId.contains(QLatin1Char('"')), Q_FUNC_INFO, + "The PUBLIC ID cannot contain quotes('\"')."); + Q_ASSERT_X(!systemId.contains(QLatin1Char('"')), Q_FUNC_INFO, + "The SYSTEM ID cannot contain quotes('\"')."); + + serialize(QLatin1String("<!DOCTYPE ")); + serialize(name); + + if(!publicId.isEmpty()) + { + Q_ASSERT_X(!systemId.isEmpty(), Q_FUNC_INFO, + "When a public identifier is specified, a system identifier " + "must also be specified in order to produce valid XML."); + serialize(" PUBLIC \""); + serialize(publicId); + serialize('"'); + } + + if(!systemId.isEmpty()) + { + if(publicId.isEmpty()) + serialize(" SYSTEM"); + + serialize(" \""); + serialize(systemId); + serialize('"'); + } + + return true; +} + +bool XMLWriter::endDTD() +{ + Q_ASSERT_X(d->tags.isEmpty() && d->namespaces.isEmpty(), Q_FUNC_INFO, + "Content such as namespace declarations or elements cannot occur inside " + "the DOCTYPE declaration, the XML is invalid."); + serialize(QLatin1String(">\n")); + return true; +} + +bool XMLWriter::startEntity(const QString &) +{ + return true; +} + +bool XMLWriter::endEntity(const QString &) +{ + return true; +} + +void XMLWriter::setMessage(const QString &msg) +{ + d->msg = msg; +} + +QString XMLWriter::modificationMessage() const +{ + return d->msg; +} + +bool XMLWriter::endDocument() +{ + Q_ASSERT_X(d->tags.isEmpty(), Q_FUNC_INFO, + "endDocument() called before all elements were closed with endElement()."); + d->device()->close(); + return true; +} + +QString XMLWriter::errorString() const +{ + return d->errorString; +} + +bool XMLWriter::ignorableWhitespace(const QString &ch) +{ + return characters(ch); +} + +bool XMLWriter::endPrefixMapping(const QString &) +{ + /* Again, should we do something with this? */ + return true; +} + +bool XMLWriter::skippedEntity(const QString &) +{ + return true; +} + +void XMLWriter::setDocumentLocator(QXmlLocator *) +{ +} + +QIODevice *XMLWriter::device() const +{ + return d->dev; +} + +void XMLWriter::setDevice(QIODevice *dev) +{ + d->dev = dev; +} + +void XMLWriter::setAddMessage(const bool toggle) +{ + d->addModificationNote = toggle; +} + +bool XMLWriter::addModificationMessage() const +{ + return d->addModificationNote; +} + +#undef serialize +// vim: et:ts=4:sw=4:sts=4 + |