/****************************************************************************
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/

//
//  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_TraceFN_H
#define Patternist_TraceFN_H

#include <private/qfunctioncall_p.h>

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Implements the function <tt>fn:trace()</tt>.
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class TraceFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
        virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;

        /**
         * Formally speaking, the type inference is:
         *
@verbatim
statEnv |-  (FN-URI,"trace")(Type) : prime(Type) * quantifier(Type)
@endverbatim
         *
         * @see <a href="http://www.w3.org/TR/xquery-semantics/#sec_fn_reverse">XQuery 1.0
         * and XPath 2.0 Formal Semantics, 7.2.12 The fn:reverse function</a>, for
         * an example of where the type inference is used
         * @returns the static type of the function's first argument.
         */
        virtual SequenceType::Ptr staticType() const;
    };
}

QT_END_NAMESPACE

#endif
