Tweet Entities parser

gistfile1.js

// API docs: https://dev.twitter.com/docs/tweet-entities
// Inspired by: https://gist.github.com/442463
function parseTweetEntities (tweet) {
    var result = [],
        entities = [],
        lastIndex = 0,
        key,
        i,
        len,
        elem;
    for (key in tweet.entities) {
        for (i = 0, len = tweet.entities[key].length; i < len; i++) {
            elem = tweet.entities[key][i];
            entities[elem.indices[0]] = {
                end: elem.indices[1],
                text: function () {
                    switch (key) {
                        case 'media':
                            return '<a href="' + elem.url + '" class="twitter-timeline-link" title="' + elem.expanded_url + '" target="_blank">' + elem.display_url + '</a>';
                            break;
                        case 'urls':
                            return (elem.display_url)? '<a href="' + elem.url + '" class="twitter-timeline-link" title="' + elem.expanded_url + '" target="_blank">' + elem.display_url + '</a>': elem.url;
                            break;
                        case 'user_mentions':
                            return '<a href="http://twitter.com/' + elem.screen_name + '" class="twitter-atreply" target="_blank"><s>@</s><b>' + elem.screen_name + '</b></a>';
                            break;
                        case 'hashtags':
                            return '<a href="http://twitter.com/search?q=%23' + elem.text + '" class="twitter-hashtag" target="_blank"><s>#</s><b>' + elem.text + '</b></a>';
                            break;
                        default:
                            return '';
                    }
                }()
            };
        }
    }
    for (i = 0, len = entities.length; i < len; i++) {
        if (entities[i]) {
            elem = entities[i];
            result[result.length] = tweet.text.substring(lastIndex, i);
            result[result.length] = elem.text;
            lastIndex = elem.end;
            i = elem.end - 1;
        }
    }
    result[result.length] = tweet.text.substring(lastIndex);
    return result.join('');
}