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/*
 * Copyright (C) 2009 Marc Boris Duerner
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * As a special exception, you may use this file as part of a free
 * software library without restriction. Specifically, if other files
 * instantiate templates or use macros or inline functions from this
 * file, or you compile this file and link it with other files to
 * produce an executable, this file does not by itself cause the
 * resulting executable to be covered by the GNU General Public
 * License. This exception does not however invalidate any other
 * reasons why the executable file might be covered by the GNU Library
 * General Public License.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef cxxtools_Xml_XmlReader_h
#define cxxtools_Xml_XmlReader_h

#include <cxxtools/string.h>
#include <cxxtools/textstream.h>
#include <cxxtools/xml/api.h>
#include <cxxtools/xml/node.h>
#include <cxxtools/xml/enddocument.h>
#include <iosfwd>

namespace cxxtools {

namespace xml {

    class Node;
    class StartElement;
    class EntityResolver;

/** @brief Reads XML as a Stream of XML Nodes.

     This class operates on an input stream from which XML character data
     is read and parsed.

     The parser will only parse the XML document as far as the user read
     data from it. To read the current element (Node) the method get() can
     be used. To parse and read the next element the method next() can be
     used. Only when next() or any corresponding method or operator is
     called, the next chunk of XML input data is parsed.

     To parse a XML-document, a XmlReader constructed with an input stream
     from which the XML document is to be read.

     The current XML element (Node) can be read using get(). Every call to
     next() will parse the next element, position the cursor to the next
     element and return the parsed element. The returned element is of type
     Node, which is the super-class for all XML element classes. The class
     Node has a method type() which returns the type of the read element.
     Depending on the type the generic Node object may be cast to the more
     concrete element object. For example a Node object with a node type of
     Node::StartElement can be cast to StartElement.

     Parsing using next() will continue until the end of the document is
     reached which will resultin a EndDocument element to be returned by
     next() and get().

     This class also provides the method current() to obtain an iterator
     which basically works the same way like using using get() and next()
     directly. The iterator can be set to the next element by using the
     ++ operator. The current element can be accessed by dereferencing
     the iterator.

     @see Node
*/
class CXXTOOLS_XML_API XmlReader
{
    public:
        class Iterator
        {
            public:
                Iterator()
                : _stream(0)
                , _node(0)
                { }

                Iterator(XmlReader& xis)
                : _stream(&xis)
                , _node(0)
                { _node = &_stream->get(); }

                Iterator(const Iterator& it)
                : _stream(it._stream), _node(it._node)
                { }

                ~Iterator()
                { }

                Iterator& operator=(const Iterator& it)
                {
                    _stream = it._stream;
                    _node = it._node;
                    return *this;
                }

                inline const Node& operator*() const
                { return *_node; }

                inline const Node* operator->() const
                { return _node; }

                Iterator& operator++()
                {
                    if(_node->type() == Node::EndDocument)
                        _node = 0;
                    else
                        _node = &_stream->next();

                    return *this;
                }

                inline bool operator==(const Iterator& it) const
                { return _node == it._node; }

                inline bool operator!=(const Iterator& it) const
                { return _node != it._node; }

            private:
                XmlReader* _stream;
                const Node* _node;
        };

    public:
        /* TODO: Consider the following processing flags:
                     - ReportProcessingInstructions
                     - IgnoreWhitespace
                     - ReportComments
                     - ReportDocumentStart
        */
        XmlReader(std::istream& is, int flags = 0);

        XmlReader(std::basic_istream<Char>& is, int flags = 0);

        ~XmlReader();

        void reset(std::basic_istream<Char>& is, int flags = 0);

        void reset(std::istream& is, int flags = 0);

        const cxxtools::String& documentVersion() const;

        const cxxtools::String& documentEncoding() const;

        bool standaloneDocument() const;

        EntityResolver& entityResolver();

        const EntityResolver& entityResolver() const;

        size_t depth() const;

        Iterator current()
        {
            return Iterator(*this);
        }

        Iterator end() const
        {
            return Iterator();
        }

        //! @brief Get current element
        const Node& get();

        //! @brief Get next element from stream
        const Node& next();

        bool advance();

        const StartElement& nextElement();

        const Node& nextTag();

        std::size_t line() const;

    private:
        class XmlReaderImpl* _impl;
};

}

}

#endif