michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: const LINKIFY_TIMEOUT = 0;
michael@0: 
michael@0: function Linkifier() {
michael@0:   this._linkifyTimer = null;
michael@0:   this._phoneRegex = /(?:\s|^)[\+]?(\(?\d{1,8}\)?)?([- ]+\(?\d{1,8}\)?)+( ?(x|ext) ?\d{1,3})?(?:\s|$)/g;
michael@0: }
michael@0: 
michael@0: Linkifier.prototype = {
michael@0:   _buildAnchor : function(aDoc, aNumberText) {
michael@0:     let anchorNode = aDoc.createElement("a");
michael@0:     let cleanedText = "";
michael@0:     for (let i = 0; i < aNumberText.length; i++) {
michael@0:       let c = aNumberText.charAt(i);
michael@0:       if ((c >= '0' && c <= '9') || c == '+')  //assuming there is only the leading '+'.
michael@0:         cleanedText += c;
michael@0:     }
michael@0:     anchorNode.setAttribute("href", "tel:" + cleanedText);
michael@0:     let nodeText = aDoc.createTextNode(aNumberText);
michael@0:     anchorNode.appendChild(nodeText);
michael@0:     return anchorNode;
michael@0:   },
michael@0: 
michael@0:   _linkifyNodeNumbers : function(aNodeToProcess, aDoc) {
michael@0:     let parent = aNodeToProcess.parentNode;
michael@0:     let nodeText = aNodeToProcess.nodeValue;
michael@0: 
michael@0:     // Replacing the original text node with a sequence of
michael@0:     // |text before number|anchor with number|text after number nodes.
michael@0:     // Each step a couple of (optional) text node and anchor node are appended.
michael@0:     let anchorNode = null;
michael@0:     let m = null;
michael@0:     let startIndex = 0;
michael@0:     let prevNode = null;
michael@0:     while (m = this._phoneRegex.exec(nodeText)) {
michael@0:       anchorNode = this._buildAnchor(aDoc, nodeText.substr(m.index, m[0].length));
michael@0: 
michael@0:       let textExistsBeforeNumber = (m.index > startIndex);
michael@0:       let nodeToAdd = null;
michael@0:       if (textExistsBeforeNumber)
michael@0:         nodeToAdd = aDoc.createTextNode(nodeText.substr(startIndex, m.index - startIndex));
michael@0:       else
michael@0:         nodeToAdd = anchorNode;
michael@0: 
michael@0:       if (!prevNode) // first time, need to replace the whole node with the first new one.
michael@0:         parent.replaceChild(nodeToAdd, aNodeToProcess);
michael@0:       else
michael@0:         parent.insertBefore(nodeToAdd, prevNode.nextSibling); //inserts after.
michael@0: 
michael@0:       if (textExistsBeforeNumber) // if we added the text node before the anchor, we still need to add the anchor node.
michael@0:         parent.insertBefore(anchorNode, nodeToAdd.nextSibling);
michael@0: 
michael@0:       // next nodes need to be appended to this node.
michael@0:       prevNode = anchorNode; 
michael@0:       startIndex = m.index + m[0].length;
michael@0:     }
michael@0: 
michael@0:     // if some text is remaining after the last anchor.
michael@0:     if (startIndex > 0 && startIndex < nodeText.length) {
michael@0:       let lastNode = aDoc.createTextNode(nodeText.substr(startIndex));
michael@0:       parent.insertBefore(lastNode, prevNode.nextSibling);
michael@0:       return lastNode;
michael@0:     }
michael@0:     return anchorNode;
michael@0:   },
michael@0: 
michael@0:   linkifyNumbers: function(aDoc) {
michael@0:     // Removing any installed timer in case the page has changed and a previous timer is still running.
michael@0:     if (this._linkifyTimer) {
michael@0:       clearTimeout(this._linkifyTimer);
michael@0:       this._linkifyTimer = null;
michael@0:     }
michael@0: 
michael@0:     let filterNode = function (node) {
michael@0:       if (node.parentNode.tagName != 'A' &&
michael@0:          node.parentNode.tagName != 'SCRIPT' &&
michael@0:          node.parentNode.tagName != 'NOSCRIPT' &&
michael@0:          node.parentNode.tagName != 'STYLE' &&
michael@0:          node.parentNode.tagName != 'APPLET' &&
michael@0:          node.parentNode.tagName != 'TEXTAREA')
michael@0:         return NodeFilter.FILTER_ACCEPT;
michael@0:       else
michael@0:         return NodeFilter.FILTER_REJECT;
michael@0:     }
michael@0: 
michael@0:     let nodeWalker = aDoc.createTreeWalker(aDoc.body, NodeFilter.SHOW_TEXT, filterNode, false);
michael@0:     let parseNode = function() {
michael@0:       let node = nodeWalker.nextNode();
michael@0:       if (!node) {
michael@0:         this._linkifyTimer = null;
michael@0:         return;
michael@0:       }
michael@0:       let lastAddedNode = this._linkifyNodeNumbers(node, aDoc);
michael@0:       // we assign a different timeout whether the node was processed or not.
michael@0:       if (lastAddedNode) {
michael@0:         nodeWalker.currentNode = lastAddedNode;
michael@0:         this._linkifyTimer = setTimeout(parseNode, LINKIFY_TIMEOUT);
michael@0:       } else {
michael@0:         this._linkifyTimer = setTimeout(parseNode, LINKIFY_TIMEOUT);
michael@0:       }
michael@0:     }.bind(this);
michael@0: 
michael@0:     this._linkifyTimer = setTimeout(parseNode, LINKIFY_TIMEOUT); 
michael@0:   }
michael@0: };