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Diffstat (limited to 'src/xmlpatterns/functions/qfunctionsignature_p.h')
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diff --git a/src/xmlpatterns/functions/qfunctionsignature_p.h b/src/xmlpatterns/functions/qfunctionsignature_p.h new file mode 100644 index 0000000..4dcd4cc --- /dev/null +++ b/src/xmlpatterns/functions/qfunctionsignature_p.h @@ -0,0 +1,213 @@ +/**************************************************************************** +** +** 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_FunctionSignature_H +#define Patternist_FunctionSignature_H + +template<typename Key, typename Value> class QHash; +template<typename T> class QList; + +#include <QSharedData> + +#include "qcalltargetdescription_p.h" +#include "qexpression_p.h" +#include "qfunctionargument_p.h" +#include "qpatternistlocale_p.h" +#include "qprimitives_p.h" + +QT_BEGIN_HEADER + +QT_BEGIN_NAMESPACE + +namespace QPatternist +{ + + /** + * @short Represents the signature of an XPath function. + * + * FunctionSignature represents and allows inspection of a function signature, + * such as <tt>fn:string-join($arg1 as xs:string*, $arg2 as xs:string) as xs:string</tt>. + * No XPath related languages allows polymorphism on the type of the arguments, only the + * amount(arity) of the arguments. For example, <tt>fn:string() as xs:string</tt> and + * <tt>fn:string($arg as item()?) as xs:string</tt> can happily co-exist, but + * <tt>fn:string($arg as item()?) as xs:string</tt> and + * <tt>fn:string($arg as xs:anyAtomicType?) as xs:string</tt> would be an error. This + * fact is reflected by FunctionSignature that if minimumArguments() and maximumArguments() + * are not equal, it means that this FunctionSignature represents several + * function signatures. + * + * @ingroup Patternist_functions + * @see <a href="http://www.w3.org/TR/xpath-functions/#func-signatures">XQuery 1.0 and + * XPath 2.0 Functions and Operators, 1.4 Function Signatures and Descriptions</a> + * @see <a href="http://en.wikipedia.org/wiki/Arity">Wikipedia, the free encyclopedia, Arity</a> + * @author Frans Englich <fenglich@trolltech.com> + */ + class Q_AUTOTEST_EXPORT FunctionSignature : public CallTargetDescription + { + public: + enum + { + /** + * Flags the function as allowing an unlimited amount of arguments. + */ + UnlimitedArity = -1 + }; + + typedef QExplicitlySharedDataPointer<FunctionSignature> Ptr; + typedef QHash<QXmlName, FunctionSignature::Ptr> Hash; + typedef QList<FunctionSignature::Ptr> List; + + /** + * A number which tells the amount of arguments a function has. + */ + typedef qint16 Arity; + + FunctionSignature(const QXmlName name, + const Arity minArgs, + const Arity maxArgs, + const SequenceType::Ptr &returnType, + const Expression::Properties chars = Expression::Properties(), + const Expression::ID id = Expression::IDIgnorableExpression); + + void setArguments(const FunctionArgument::List &args); + FunctionArgument::List arguments() const; + + /** + * This is a convenience function. Calling this once, is equal to + * calling setArguments() with a list containing a FunctionsArgument with name @p name + * and type @p type. + */ + void appendArgument(const QXmlName::LocalNameCode name, + const SequenceType::Ptr &type); + + /** + * Checks whether @p arity is within the range of allowed count of arguments. For example, + * when the minimum arguments is 1 and maximum arguments 2, @c false will be returned for + * passing 0 while @c true will be returned when 2 is passed. + */ + bool isArityValid(const xsInteger arity) const; + + Arity minimumArguments() const; + Arity maximumArguments() const; + + /** + * The return type of this function signature. For example, if the represented function + * signature is <tt>fn:string() as xs:string</tt>, the return type is <tt>xs:string</tt>. + */ + SequenceType::Ptr returnType() const; + + /** + * The properties that the corresponding FunctionCall instance should return in + * Expression::properties(). + */ + Expression::Properties properties() const; + + /** + * Determines whether this FunctionSignature is equal to @p other, taking + * into account XPath's function polymorphism. @p other is equal to this + * FunctionSignature if their name() instances are equal, and that the maximumArguments() + * and minimumArguments() arguments of @p other are allowed, as per isArityValid(). + * + * In other words, this equalness operator can return @c true for different + * signatures, but it do make sense since a FunctionSignature can represent + * multiple signatures. + * + * @returns @c true if this FunctionSignature is equal to @p other, otherwise @c false + */ + bool operator==(const FunctionSignature &other) const; + + /** + * Builds a string representation for this function signature. The syntax + * used is the one used in the XQuery. It looks like this: + * + * <tt>prefix:function-name($parameter-name as parameter-type, ...) as return-type</tt> + * + * The prefix used for the name is conventional. For example, for constructor functions + * is @c xs used. + * + * @see <a href="http://www.w3.org/TR/xpath-functions/#func-signatures">XQuery 1.0 and + * XPath 2.0 Functions and Operators, 1.4 Function Signatures and Descriptions</a> + */ + QString displayName(const NamePool::Ptr &np) const; + + /** + * The ID that the corresponding FunctionCall instance should return in + * Expression::id(). + */ + Expression::ID id() const; + + private: + Q_DISABLE_COPY(FunctionSignature) + + const Arity m_minArgs; + const Arity m_maxArgs; + const SequenceType::Ptr m_returnType; + FunctionArgument::List m_arguments; + const Expression::Properties m_props; + const Expression::ID m_id; + }; + + /** + * @short Formats FunctionSignature. + */ + static inline QString formatFunction(const NamePool::Ptr &np, const FunctionSignature::Ptr &func) + { + return QLatin1String("<span class='XQuery-function'>") + + escape(func->displayName(np)) + + QLatin1String("</span>"); + } +} + +QT_END_NAMESPACE + +QT_END_HEADER + +#endif |