/*
 * functions.h - Copyright 2005 Frerich Raabe <raabe@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 FUNCTIONS_H
#define FUNCTIONS_H

#include "expression.h"

#include <QHash>
#include <QList>

#include "dom/dom_string.h"
#include "xml/dom_stringimpl.h"

namespace khtml {
namespace XPath {

class Function : public Expression
{
	public:
		void setArguments( const QList<Expression *> &args );
		void setName( const DOM::DOMString &name );

		virtual QString dump() const;

	protected:
		Expression *arg( int pos );
		const Expression *arg( int pos ) const;
		unsigned int argCount() const;
		DOM::DOMString name() const;

	private:
		DOM::DOMString m_name;
};

class FunctionLibrary
{
	friend struct FunctionMapping;
	public:
		static FunctionLibrary &self();

		Function *getFunction( const DOM::DOMString& name,
		                       const QList<Expression *> &args = QList<Expression *>() ) const;

	private:
		struct FunctionRec;

		FunctionLibrary();
		FunctionLibrary( const FunctionLibrary &rhs );
		FunctionLibrary &operator=( const FunctionLibrary &rhs );

		QHash<DOM::DOMString, FunctionRec> m_functionDict;
};

} // namespace XPath

} // namespace khtml

#endif // FUNCTIONS_H