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Diffstat (limited to 'src/xmlpatterns/expr/qexpressionfactory_p.h')
| -rw-r--r-- | src/xmlpatterns/expr/qexpressionfactory_p.h | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/src/xmlpatterns/expr/qexpressionfactory_p.h b/src/xmlpatterns/expr/qexpressionfactory_p.h new file mode 100644 index 0000000..c06a7e5 --- /dev/null +++ b/src/xmlpatterns/expr/qexpressionfactory_p.h @@ -0,0 +1,187 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (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 either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists purely as an +// implementation detail. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. + +#ifndef Patternist_ExpressionFactory_H +#define Patternist_ExpressionFactory_H + +#include <QXmlQuery> + +#include "qexpression_p.h" +#include "qtokenizer_p.h" + +#include <QSharedData> +#include <QUrl> + +QT_BEGIN_HEADER + +QT_BEGIN_NAMESPACE + +class QIODevice; + +namespace QPatternist +{ + /** + * @short The central entry point for compiling expressions. + * + * @ingroup Patternist_expressions + * @author Frans Englich <fenglich@trolltech.com> + */ + class Q_AUTOTEST_EXPORT ExpressionFactory : public QSharedData + { + public: + typedef QExplicitlySharedDataPointer<ExpressionFactory> Ptr; + + /** + * @short This constructor cannot be synthesized since we + * use the Q_DISABLE_COPY macro. + */ + inline ExpressionFactory() + { + } + + virtual ~ExpressionFactory() + { + } + + enum CompilationStage + { + QueryBodyInitial = 1, + QueryBodyTypeCheck = 1 << 1, + QueryBodyCompression = 1 << 2, + UserFunctionTypeCheck = 1 << 3, + UserFunctionCompression = 1 << 4, + GlobalVariableTypeCheck = 1 << 5 + }; + + /** + * Creates a compiled representation of the XPath expression @p expr, with Static + * Context information supplied via @p context. This is for example whether the expression + * is an XPath 1.0 or XPath 2.0 expression, or what functions that are available. + * + * @p requiredType specifies what type results of the evaluating the expression + * must match. Passing CommonValues::ZeroOrMoreItems allows anything as result, while + * passing CommonSequenceTypes::EBV means anything but an Effective %Boolean Value extractable + * result is a type error, for example. + * + * @note An empty @p expr is an invalid XPath expression. It will be reported as such, + * but it is neverthless the caller's resonsibility to ensure that it's not that(since + * it is likely invalid already in the medium it was stored). + */ + virtual Expression::Ptr createExpression(const QString &expr, + const StaticContext::Ptr &context, + const QXmlQuery::QueryLanguage lang, + const SequenceType::Ptr &requiredType, + const QUrl &queryURI, + const QXmlName &initialTemplateName); + + virtual Expression::Ptr createExpression(QIODevice *const device, + const StaticContext::Ptr &context, + const QXmlQuery::QueryLanguage lang, + const SequenceType::Ptr &requiredType, + const QUrl &queryURI, + const QXmlName &initialTemplateName); + + /** + * Finds the last paths of a set of paths(if any) and tells the Path + * so, such that it can generate the code for checking XPTY0018. + * + * Must be called before typeCheck() is called on the operand, since + * the typeCheck() uses the information for type checking. + */ + static void registerLastPath(const Expression::Ptr &operand); + + protected: + enum TemplateCompilationStage + { + TemplateInitial = 1, + TemplateTypeCheck = 1 << 1, + TemplateCompress = 1 << 2 + }; + + /** + * This function is called by createExpression() each time + * after a pass on the AST has been completed. Under a typical + * compilation this function is thus called three times: after the initial + * build, after the Expression::typeCheck() stage, and after + * Expression::compress(). @p tree is the AST after each pass. + * + * This mechanism is currently used for debugging, since it provides a + * way of introspecting what the compilation process do to the tree. The + * current implementation do nothing. + */ + virtual void processTreePass(const Expression::Ptr &tree, + const CompilationStage stage); + + virtual void processTemplateRule(const Expression::Ptr &body, + const TemplatePattern::Ptr &pattern, + const QXmlName &mode, + const TemplateCompilationStage stage); + + virtual void processNamedTemplate(const QXmlName &name, + const Expression::Ptr &tree, + const TemplateCompilationStage stage); + + Expression::Ptr createExpression(const Tokenizer::Ptr &tokenizer, + const StaticContext::Ptr &context, + const QXmlQuery::QueryLanguage lang, + const SequenceType::Ptr &requiredType, + const QUrl &queryURI, + const QXmlName &initialTemplateName); + private: + Q_DISABLE_COPY(ExpressionFactory) + }; +} + +QT_END_NAMESPACE + +QT_END_HEADER + +#endif |