/*
 * dom3_xpathimpl.h - Copyright 2005 Frerich Raabe <raabe@kde.org>
 *                    Copyright 2010 Maksim Orlovich <maksim@kde.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef XPATHRESULTIMPL_H
#define XPATHRESULTIMPL_H

#include "misc/shared.h"
#include "xpath/expression.h"
#include "xpath/parsedstatement.h"

namespace DOM
{
class DOMStringImpl;
class NodeImpl;
}

namespace khtml
{

class XPathNSResolverImpl;

class XPathResultImpl : public Shared<XPathResultImpl>
{
public:
    XPathResultImpl();
    XPathResultImpl(const XPath::Value &value);

    void convertTo(unsigned short type, int &exceptioncode);

    unsigned short resultType() const;

    double numberValue(int &exceptioncode) const;
    DOM::DOMString stringValue(int &exceptioncode) const;
    bool booleanValue(int &exceptioncode) const;
    DOM::NodeImpl *singleNodeValue(int &exceptioncode) const;

    bool invalidIteratorState() const;
    unsigned long snapshotLength(int &exceptioncode) const;
    DOM::NodeImpl *iterateNext(int &exceptioncode);
    DOM::NodeImpl *snapshotItem(unsigned long index, int &exceptioncode);

private:
    XPath::Value m_value;
    unsigned long  m_nodeIterator;
    unsigned short m_resultType;
};

class XPathExpressionImpl : public Shared<XPathExpressionImpl>
{
public:
    XPathExpressionImpl(const DOM::DOMString &expression,
                        XPathNSResolverImpl *resolver);

    // expression we got while parsing, or 0
    int parseExceptionCode();

    XPathResultImpl *evaluate(DOM::NodeImpl *contextNode,
                              unsigned short type,
                              XPathResultImpl *result,
                              int &exceptioncode);

private:
    XPath::ParsedStatement m_statement;
};

// This is the base class for resolver interfaces
class XPathNSResolverImpl : public khtml::Shared<XPathNSResolverImpl>
{
public:
    enum Type {
        Default,
        JS,
        CPP
    };

    virtual DOM::DOMString lookupNamespaceURI(const DOM::DOMString &prefix) = 0;
    virtual Type type() = 0;
    virtual ~XPathNSResolverImpl() {}
};

// This is the default implementation, used by createNSResolver
class DefaultXPathNSResolverImpl : public XPathNSResolverImpl
{
public:
    DefaultXPathNSResolverImpl(DOM::NodeImpl *node);

    virtual DOM::DOMString lookupNamespaceURI(const DOM::DOMString &prefix);
    virtual Type type()
    {
        return Default;
    }

private:
    SharedPtr<DOM::NodeImpl> m_node;
};

} // namespace khtml

#endif // XPATHRESULTIMPL_H

