/*
    This file is part of the syndication library
    SPDX-FileCopyrightText: 2005 Frank Osterfeld <osterfeld@kde.org>

    SPDX-License-Identifier: LGPL-2.0-or-later
*/

#ifndef SYNDICATION_ABSTRACTPARSER_H
#define SYNDICATION_ABSTRACTPARSER_H

#include "specificdocument.h"

#include "syndication_export.h"

class QString;

namespace Syndication
{
class DocumentSource;

/*!
 * \class Syndication::AbstractParser
 * \inmodule Syndication
 * \inheaderfile Syndication/AbstractParser
 *
 * \brief Interface for all parsers.
 *
 * The parsers for the various formats must
 * implement this interface and register themselves at the ParserRegistry.
 */
class SYNDICATION_EXPORT AbstractParser
{
public:
    virtual ~AbstractParser();

    /*!
     * Lets the parser check if it can parse the passed source.
     *
     * Parser implementations should do a _quick_ check for the file
     * format (i.e. check for feed format and version number in the root
     * element) to find out if the source is in a supported format. They
     * should _not_ completely parse the document to test for full
     * compliance to the format specification.
     *
     * \a source the document source to be checked
     *
     * Returns whether \a source seems to be in a format supported by the
     * parser
     */
    virtual bool accept(const DocumentSource &source) const = 0;

    /*!
     * Lets the parser parse a document source.
     *
     * The parser returns a
     * valid document instance if successful, or an invalid one if
     * not.
     *
     * \sa SpecificDocument::isValid()
     *
     * \a source The document source to be parsed
     *
     * Returns a newly created document parsed from \a source
     */
    virtual SpecificDocumentPtr parse(const DocumentSource &source) const = 0;

    /*!
     * Returns the name of the format supported by this
     * parser.
     *
     * Returns a string like "rss2", "atom" or "rdf"
     */
    virtual QString format() const = 0;
};

} // namespace Syndication

#endif // SYNDICATION_ABSTRACTPARSER_H