soundcloud.js

/**
 * Find first occurence of possible separator in given string
 * and return separator's position and size in chars or null
 */
function findSeparator(str) {
   // care - minus vs hyphen
   var separators = [' - ', ' – ', '-', '–', ':'];

   for (i in separators) {
      var sep = separators[i];
      var index = str.indexOf(sep);
      if (index > -1)
         return { index: index, length: sep.length };
   }

   return null;
}

/**
 * Parse given string into artist and track, assume common order Art - Ttl
 * @return {artist, track}
 */
function parseInfo(artistTitle) {
   var artist = '';
   var track = '';

   var separator = findSeparator(artistTitle);
   if (separator == null)
      return { artist: '', track: '' };

   artist = artistTitle.substr(0, separator.index);
   track = artistTitle.substr(separator.index + separator.length);

   return cleanArtistTrack(artist, track);
}


/**
 * Clean non-informative garbage from title
 */
function cleanArtistTrack(artist, track) {

   // Do some cleanup
   artist = artist.replace(/^\s+|\s+$/g,'');
   track = track.replace(/^\s+|\s+$/g,'');

   // Strip crap
   track = track.replace(/\s*\*+\s?\S+\s?\*+$/, ''); // **NEW**
   track = track.replace(/\s*\[[^\]]+\]$/, ''); // [whatever]
   track = track.replace(/\s*\([^\)]*version\)$/i, ''); // (whatever version)
   track = track.replace(/\s*\.(avi|wmv|mpg|mpeg|flv)$/i, ''); // video extensions
   track = track.replace(/\s*(of+icial\s*)?(music\s*)?video/i, ''); // (official)? (music)? video
   track = track.replace(/\s*\(\s*of+icial\s*\)/i, ''); // (official)
   track = track.replace(/\s*\(\s*[0-9]{4}\s*\)/i, ''); // (1999)
   track = track.replace(/\s+\(\s*(HD|HQ)\s*\)$/, ''); // HD (HQ)
   track = track.replace(/\s+(HD|HQ)\s*$/, ''); // HD (HQ)
   track = track.replace(/\s*video\s*clip/i, ''); // video clip
   track = track.replace(/\s+\(?live\)?$/i, ''); // live
   track = track.replace(/\(\s*\)/, ''); // Leftovers after e.g. (official video)
   track = track.replace(/^(|.*\s)"(.*)"(\s.*|)$/, '$2'); // Artist - The new "Track title" featuring someone
   track = track.replace(/^(|.*\s)'(.*)'(\s.*|)$/, '$2'); // 'Track title'
   track = track.replace(/^[\/\s,:;~-]+/, ''); // trim starting white chars and dash
   track = track.replace(/[\/\s,:;~-]+$/, ''); // trim trailing white chars and dash

   return {artist: artist, track: track};
}


(function() {
    var options;
    var current = {};

    var song = function(ptitle) {
        var title = ptitle.split(' by ');
        var parsedInfo = parseInfo(title[0]);

        if (parsedInfo.artist === '') {
            parsedInfo.track = title[0];
            parsedInfo.artist = title[1];
        }

        return {
            artist: parsedInfo.artist,
            track: parsedInfo.track,
            duration: duration(title[0])
        };
    };

    var duration = function(title) {
        node = $('.sound.playing').not('.playlist').find('.timeIndicator__total');
        if (node.length) {
            // time is given as h.m.s
            var digits = node[0].innerHTML.split(/\D/),
                seconds = 0, length, digit;

            length = digits.length;
            if (length > 3)
                return;

            while (digits.length) {
                d = digits.pop();
                seconds += parseInt(d, 10) * Math.pow(60, length - digits.length - 1);
            }
            return seconds;
        }
        // if unknown duration, assume 2 minutes
        return 120;
    };

    $(document).ready(function() {
        var current_title = '';
        $('title').live('DOMSubtreeModified', function() {
            var title = $(this).text();
            if (title[0] !== '▶' || current_title === title)
                return;
            current_title = title;
            setTimeout(function () {
                var s = song(title.substr(2));

                chrome.extension.sendRequest({type: 'validate',
                                            artist: s.artist,
                                             track: s.track},
                function(response) {
                    current.validated = response;
                    if (response !== false) {
                        chrome.extension.sendRequest({type: 'nowPlaying',
                                                    artist: response.artist,
                                                     track: response.track,
                                                  duration: s.duration});
                    }

                    else {
                        chrome.extension.sendRequest({type: 'nowPlaying',
                                                  duration: s.duration});
                    }
                });
            }, 500);
        });
    });

    $(window).unload(function() {
        chrome.extension.sendRequest({type: 'reset'});
        return true;
    });
})();