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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
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**
**
**
****************************************************************************/
//
// 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
#include <QSharedData>
#include <private/qcalltargetdescription_p.h>
#include <private/qexpression_p.h>
#include <private/qfunctionargument_p.h>
#include <private/qpatternistlocale_p.h>
#include <private/qprimitives_p.h>
QT_BEGIN_NAMESPACE
template<typename Key, typename Value> class QHash;
template<typename T> class QList;
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 <frans.englich@nokia.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
#endif
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