Extendable Linkify Implementation

linkify.js

function linkify(el, transforms) {
  var node, nodes = [],
      count = 0, loop = 0, match = 0;

  var walker = document.createTreeWalker(el, NodeFilter.SHOW_TEXT, {
    acceptNode: function(node) {
      if (!(node.parentNode
            && node.parentNode.nodeName.toUpperCase() == 'A'
            || node.parentNode.nodeName.toUpperCase() == 'STYLE')) {
        return NodeFilter.FILTER_ACCEPT;
      }
    }
  }, false);

  while (node = walker.nextNode()) nodes.push(node);

  while (node = nodes.shift()) {
    count++;
    (function transform(node, i) {
      i = i || 0;
      var originalText = node.textContent;
      if (!transforms[i] || originalText.trim().length == 0) return;
      loop++;
      var newText = transforms[i](originalText);
      if (originalText != newText) {
        match++;
        var newNode = document.createElement('span');
        newNode.innerHTML = newText;
        node.parentNode.insertBefore(newNode, node);
        node.parentNode.removeChild(node);
        if (newNode.prevSibling) nodes.push(newNode.prevSibling);
        if (newNode.nextSibling) nodes.push(newNode.nextSibling);
      } else {
        transform(node, i+1)
      }
    })(node);
  }

  return [count, loop, match]
}