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   1  matches.forEach(function(m)
   2  {
   3      // Linkify the trimmed URL
   4      linkifyUrl(m[0][1], trimUrl(m[0][0]));
   5  });
   6  
   7  /**
   8  * Linkify given URL at given position
   9  *
  10  * @param {!number} tagPos URL's position in the text
  11  * @param {!string} url    URL
  12  */
  13  function linkifyUrl(tagPos, url)
  14  {
  15      // Ensure that the anchor (scheme/www) is still there
  16      if (!/^www\.|^[^:]+:/i.test(url))
  17      {
  18          return;
  19      }
  20  
  21      // Create a zero-width end tag right after the URL
  22      var endTag = addEndTag(config.tagName, tagPos + url.length, 0);
  23  
  24      // If the URL starts with "www." we prepend "http://"
  25      if (url[3] === '.')
  26      {
  27          url = 'http://' + url;
  28      }
  29  
  30      // Create a zero-width start tag right before the URL, with a slightly worse priority to
  31      // allow specialized plugins to use the URL instead
  32      var startTag = addStartTag(config.tagName, tagPos, 0, 1);
  33      startTag.setAttribute(config.attrName, url);
  34  
  35      // Pair the tags together
  36      startTag.pairWith(endTag);
  37  };
  38  
  39  /**
  40  * Remove trailing punctuation from given URL
  41  *
  42  * We remove most ASCII non-letters from the end of the string.
  43  * Exceptions:
  44  *  - dashes (some YouTube URLs end with a dash due to the video ID)
  45  *  - equal signs (because of "foo?bar="),
  46  *  - trailing slashes,
  47  *  - closing parentheses are balanced separately.
  48  *
  49  * @param  {!string} url Original URL
  50  * @return {!string}     Trimmed URL
  51  */
  52  function trimUrl(url)
  53  {
  54      return url.replace(/(?![-=\/)])[\s!-.:-@[-`{-~]+$/, '');
  55  }