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Includes : XPath

xpath Function

  1. // ==UserScript==
  2. // @name           Includes : XPath
  3. // @description    xpath Function
  4. // @author         You
  5. // @version        1.0
  6. // @language       en
  7. // @include        nowhere
  8. // @namespace https://greasyfork.org/users/1385333
  9. // ==/UserScript==
  10.  
  11. /**************************************************************************
  12.  
  13.     Author 's NOTE
  14.  
  15.     Original http://lowreal.net/blog/2007/11/17/1
  16.  
  17. ***************************************************************************
  18.  
  19.     This program is free software: you can redistribute it and/or modify
  20.     it under the terms of the GNU General Public License as published by
  21.     the Free Software Foundation, either version 3 of the License, or
  22.     (at your option) any later version.
  23.  
  24.     This program is distributed in the hope that it will be useful,
  25.     but WITHOUT ANY WARRANTY; without even the implied warranty of
  26.     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27.     GNU General Public License for more details.
  28.  
  29.     You should have received a copy of the GNU General Public License
  30.     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  31.  
  32. **************************************************************************/
  33.  
  34. const XPath = Xpath = xpath = (...args) => {
  35.     let [expression, context, type] = args;  // Destructuring arguments
  36.  
  37.     if (typeof context === "function") {
  38.         type = context;
  39.         context = null;
  40.     }
  41.  
  42.     if (!context) context = document.documentElement || document;
  43.     const documentInstance = context.ownerDocument || context;
  44.  
  45.     const evaluator = documentInstance.createExpression(expression, (prefix) => {
  46.         const ns = documentInstance.createNSResolver(context).lookupNamespaceURI(prefix);
  47.         if (ns) return ns;
  48.  
  49.         switch (context.contentType) {
  50.             case "text/xhtml":
  51.             case "application/xhtml+xml":
  52.                 return "http://www.w3.org/1999/xhtml";
  53.             default:
  54.                 return "";
  55.         }
  56.     });
  57.  
  58.     switch (type) {
  59.         case String:
  60.             return evaluator.evaluate(context, XPathResult.STRING_TYPE, null).stringValue;
  61.         case Number:
  62.             return evaluator.evaluate(context, XPathResult.NUMBER_TYPE, null).numberValue;
  63.         case Boolean:
  64.             return evaluator.evaluate(context, XPathResult.BOOLEAN_TYPE, null).booleanValue;
  65.         case Array: {
  66.             const result = evaluator.evaluate(context, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
  67.             const resultArray = [];
  68.             for (let i = 0; i < result.snapshotLength; i++) {
  69.                 resultArray.push(result.snapshotItem(i));
  70.             }
  71.             return resultArray;
  72.         }
  73.         case undefined: {
  74.             const result = evaluator.evaluate(context, XPathResult.ANY_TYPE, null);
  75.             switch (result.resultType) {
  76.                 case XPathResult.STRING_TYPE:
  77.                     return result.stringValue;
  78.                 case XPathResult.NUMBER_TYPE:
  79.                     return result.numberValue;
  80.                 case XPathResult.BOOLEAN_TYPE:
  81.                     return result.booleanValue;
  82.                 case XPathResult.UNORDERED_NODE_ITERATOR_TYPE: {
  83.                     const nodes = [];
  84.                     let node;
  85.                     while ((node = result.iterateNext())) {
  86.                         nodes.push(node);
  87.                     }
  88.                     return nodes;
  89.                 }
  90.                 default:
  91.                     return null;
  92.             }
  93.         }
  94.         default:
  95.             throw new TypeError("xpath: specified type is not a valid type.");
  96.     }
  97. };