/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is HTML5 video itext demonstration code.
 *
 * The Initial Developer of the Original Code is Mozilla Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Silvia Pfeiffer <silvia@siliva-pfeiffer.de>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

// Stop JSLint whinging about globals //
/*global parseInt: true, parseSrt: true */

// SRT specification from http://forum.doom9.org/archive/index.php/t-73953.html
// but without the formatting, which is just interpreted as text

// Function to parse srt file
function parseSrt(data) {
    var srt = data.replace(/\r+/g, ''); // remove dos newlines
    srt = srt.replace(/^\s+|\s+$/g, ''); // trim white space start and end
    srt = srt.replace(/<[a-zA-Z\/][^>]*>/g, ''); // remove all html tags for security reasons

    // get captions
    var captions = [];
    var caplist = srt.split('\n\n');
    for (var i = 0; i < caplist.length; i=i+1) {
        var caption = "";
        var content, start, end, s;
        caption = caplist[i];
        s = caption.split(/\n/);
        if (s[0].match(/^\d+$/) && s[1].match(/\d+:\d+:\d+/)) {
            // ignore caption number in s[0]
            // parse time string
            var m = s[1].match(/(\d+):(\d+):(\d+)(?:,(\d+))?\s*--?>\s*(\d+):(\d+):(\d+)(?:,(\d+))?/);
            if (m) {
                start =
                  (parseInt(m[1], 10) * 60 * 60) +
                  (parseInt(m[2], 10) * 60) +
                  (parseInt(m[3], 10)) +
                  (parseInt(m[4], 10) / 1000);
                end =
                  (parseInt(m[5], 10) * 60 * 60) +
                  (parseInt(m[6], 10) * 60) +
                  (parseInt(m[7], 10)) +
                  (parseInt(m[8], 10) / 1000);
            } else {
                // Unrecognized timestring
                continue;
            }
            // concatenate text lines to html text
            content = s.slice(2).join("<br>");
        } else {
            // file format error or comment lines
            continue;
        }
        captions.push({start: start, end: end, content: content});
    }

    return captions;
}