autolinkWithEntities.js

twttr.txt.autoLinkWithEntities =  function(text, entities) {
    var result = [];
    var allEntities = [];

    var addEntities = function (key, array) {
      if (entities[key]) {
        array.push.apply(array, entities[key].map(function (ea) { return {type: key, value: ea}}));
      };
    };

    for (var key in entities) {
      addEntities(key, allEntities);
    }

    allEntities.sort(function (a,b) { return a.value.indices[0] - b.value.indices[0];});

    var linkersFor = {
      urls: function (text, url) {
        var displayUrl = twttr.txt.htmlEscape(url.display_url || url.url);
        var expandedUrl = twttr.txt.htmlEscape(url.expanded_url || url.url);
        var srcUrl = twttr.txt.htmlEscape(url.url);
        return '<a href="' + srcUrl + '" target="_blank" rel="nofollow" data-expanded-url="' + expandedUrl + '" class="twitter-timeline-link">' + displayUrl + '</a>';
      },
      hashtags: function (text, hashtag) {
        var escaped = twttr.txt.htmlEscape(hashtag.text);
        return '<a href="#!/search?q=%23' + escaped + '" title = "#' + escaped + '" class="twitter-hashtag" rel="nofollow">#' + escaped + "</a>";
      },
      user_mentions: function (text, user_mention) {
        var screenName = twttr.txt.htmlEscape(user_mention.screen_name);
        return '<a class="twitter-atreply" data-screen-name="' + screenName + '" href="http://twitter.com/' + screenName + '" rel="nofollow">' + screenName + "</a>";
      }
    };

    var index = 0;
    allEntities.forEach(function (object) {
        var type = object.type;
        var entity = object.value;
        var start = entity.indices[0];
        var end = entity.indices[1];
        result.push(text.slice(index, start));
        var linker = linkersFor[type] || function (text) { return text;};
        result.push(linker(text.slice(start, end), entity));
        index = end;
    });
    result.push(text.slice(index, text.length + 1));
    return result.join("");
  };