/** @file
 * @brief Extract text from an RSS atom file.
 */
/* Copyright (C) 2010,2011,2012,2020 Olly Betts
 * Copyright (C) 2012 Mihai Bivol
 *
 * 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 2 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
 * <https://www.gnu.org/licenses/>.
 */

#include <config.h>

#include "atomparser.h"
#include "htmlparser.h"
#include "stringutils.h"

using namespace std;

void
AtomParser::process_content(const string& content)
{
    if (!target)
        return;

    if (!target->empty())
        *target += ' ';

    if (html_content) {
        HtmlParser p;
        p.parse(content, charset, true);
        *target += p.dump;
    } else {
        *target += content;
    }
}

bool
AtomParser::opening_tag(const string& tag)
{
    if (state == INACTIVE) {
        if (tag == "title") {
            if (in_entry) {
                // Treat <title> inside <entry> as more keywords.
                target = &keywords;
            } else {
                target = &title;
            }
            goto check_type_attribute;
        } else if (tag == "summary" || tag == "subtitle" || tag == "content") {
            target = &dump;
check_type_attribute:
            string type;
            html_content = (get_attribute("type", type) &&
                            (type == "html" || type == "xhtml"));
            state = OTHER;
        } else if (tag == "author") {
            target = &author;
            html_content = false;
            state = AUTHOR;
        } else if (tag == "entry") {
            in_entry = true;
        } else if (tag == "category") {
            // Handle category term separately.
            string new_keyword;
            get_attribute("term", new_keyword);
            if (!keywords.empty())
                keywords += ' ';
            keywords += new_keyword;
        }
        if (state != INACTIVE) {
            active_tag = tag;
        }
    } else if (state == AUTHOR) {
        if (tag == "uri")
            target = NULL;
    }

    return true;
}

bool
AtomParser::closing_tag(const string& tag)
{
    if (state != INACTIVE && tag == active_tag) {
        active_tag = string();
        state = INACTIVE;
        target = NULL;
    } else if (in_entry && tag == "entry") {
        in_entry = false;
    } else if (state == AUTHOR && tag == "uri") {
        target = &author;
    }
    return true;
}
