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//
// aegis - project change supervisor
// Copyright (C) 2005, 2006, 2008, 2012 Peter Miller
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or (at
// your option) any later version.
//
// This program 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//

#ifndef LIBAEGIS_XMLTEXTREAD_H
#define LIBAEGIS_XMLTEXTREAD_H

#include <libxml/xmlreader.h>
#include <libxml/xmlversion.h>

#if LIBXML_VERSION < 20510
enum xmlReaderTypes
{
    XML_READER_TYPE_NONE = 0,
    XML_READER_TYPE_ELEMENT = 1,
    XML_READER_TYPE_ATTRIBUTE = 2,
    XML_READER_TYPE_TEXT = 3,
    XML_READER_TYPE_CDATA = 4,
    XML_READER_TYPE_ENTITY_REFERENCE = 5,
    XML_READER_TYPE_ENTITY = 6,
    XML_READER_TYPE_PROCESSING_INSTRUCTION = 7,
    XML_READER_TYPE_COMMENT = 8,
    XML_READER_TYPE_DOCUMENT = 9,
    XML_READER_TYPE_DOCUMENT_TYPE = 10,
    XML_READER_TYPE_DOCUMENT_FRAGMENT = 11,
    XML_READER_TYPE_NOTATION = 12,
    XML_READER_TYPE_WHITESPACE = 13,
    XML_READER_TYPE_SIGNIFICANT_WHITESPACE = 14,
    XML_READER_TYPE_END_ELEMENT = 15,
    XML_READER_TYPE_END_ENTITY = 16,
    XML_READER_TYPE_XML_DECLARATION = 17
};
#endif

#include <libaegis/input.h>

class xml_text_reader
{
public:
    virtual ~xml_text_reader();

    xml_text_reader(input &deeper, bool validate = false);

    void parse(void);

protected:
    virtual void process_node(void) = 0;

    virtual void process_node_end(bool empty);

    int depth(void) { return xmlTextReaderDepth(reader); }

    xmlReaderTypes
    node_type(void)
    {
        return (xmlReaderTypes)xmlTextReaderNodeType(reader);
    }

    static const char *xmlReaderType_ename(xmlReaderTypes);

    const xmlChar *name(void) { return xmlTextReaderName(reader); }

    int is_empty_element(void) { return xmlTextReaderIsEmptyElement(reader); }

    int has_value(void) { return xmlTextReaderHasValue(reader); }

    const xmlChar *value(void) { return xmlTextReaderValue(reader); }

    void move_back_to_element(void) { xmlTextReaderMoveToElement(reader); }

private:
    input deeper;

    xmlTextReaderPtr reader;

    int number_of_errors;

    static int number_of_parsers;

    bool validate;

    static int read_callback(void *context, char *buffer, int len);

    int read_deeper(char *buffer, int len);

    static int close_callback(void *context);

    void close(void);

    static void error_callback(void *context, const char *msg,
        xmlParserSeverities severity, xmlTextReaderLocatorPtr locator);

    void error(const char *msg, xmlParserSeverities severity,
        xmlTextReaderLocatorPtr locator);

    bool read(void);

    xml_text_reader();

    xml_text_reader(const xml_text_reader &);

    xml_text_reader &operator=(const xml_text_reader &);
};

#endif // LIBAEGIS_XMLTEXTREAD_H
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