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XPath

xpath Function

此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.cn-greasyfork.org/scripts/29174/189853/XPath.js 

  1. // ==UserScript==
  2. // @name           XPath
  3. // @namespace      http://gm.wesley.eti.br/includes
  4. // @description    xpath Function
  5. // @author         w35l3y
  6. // @email          w35l3y@brasnet.org
  7. // @copyright      2009+, w35l3y (http://gm.wesley.eti.br)
  8. // @license        GNU GPL
  9. // @homepage       http://gm.wesley.eti.br
  10. // @version        1.0.0.5
  11. // @language       en
  12. // @include        nowhere
  13. // ==/UserScript==
  14.  
  15. /**************************************************************************
  16.  
  17. 	Author 's NOTE
  18.  
  19.     Original http://lowreal.net/blog/2007/11/17/1
  20.  
  21. ***************************************************************************
  22.  
  23.     This program is free software: you can redistribute it and/or modify
  24.     it under the terms of the GNU General Public License as published by
  25.     the Free Software Foundation, either version 3 of the License, or
  26.     (at your option) any later version.
  27.  
  28.     This program is distributed in the hope that it will be useful,
  29.     but WITHOUT ANY WARRANTY; without even the implied warranty of
  30.     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  31.     GNU General Public License for more details.
  32.  
  33.     You should have received a copy of the GNU General Public License
  34.     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  35.  
  36. **************************************************************************/
  37.  
  38. XPath = Xpath = xpath = function()
  39. {
  40.     var a = Array.prototype.slice.call(arguments),	// args
  41.         e = a[0],	// expression
  42.         c = a[1],	// context
  43.         t = a[2];	// type
  44.  
  45.     if (typeof c == "function")
  46.     {
  47.         t = c;
  48.         c = null;
  49.     }
  50.     if (!c)
  51.         c = document.documentElement||document;
  52.     var d = c.ownerDocument || c;
  53.     e = d.createExpression(e, function(p)
  54.                            {
  55.         var o = d.createNSResolver(c).lookupNamespaceURI(p);
  56.  
  57.         if (o)
  58.             return o;
  59.         else switch (c.contentType)
  60.         {
  61.             case "text/xhtml":
  62.             case "application/xhtml+xml":
  63.                 return "http://www.w3.org/1999/xhtml";
  64.             default:
  65.                 return "";
  66.         }
  67.     });
  68.  
  69.     switch (t)
  70.     {
  71.         case String:
  72.             return e.evaluate(c, XPathResult.STRING_TYPE, null).stringValue;
  73.         case Number:
  74.             return e.evaluate(c, XPathResult.NUMBER_TYPE, null).numberValue;
  75.         case Boolean:
  76.             return e.evaluate(c, XPathResult.BOOLEAN_TYPE, null).booleanValue;
  77.         case Array:
  78.             var r = e.evaluate(c, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null),
  79.                 o = [];
  80.  
  81.             for ( var ai = 0 , at = r.snapshotLength ; ai < at ; ++ai )
  82.                 o.push(r.snapshotItem(ai));
  83.  
  84.             return o;
  85.         case undefined:
  86.             r = e.evaluate(c, XPathResult.ANY_TYPE, null);
  87.             switch (r.resultType)
  88.             {
  89.                 case XPathResult.STRING_TYPE:
  90.                     return r.stringValue;
  91.                 case XPathResult.NUMBER_TYPE:
  92.                     return r.numberValue;
  93.                 case XPathResult.BOOLEAN_TYPE:
  94.                     return r.booleanValue;
  95.                 case XPathResult.UNORDERED_NODE_ITERATOR_TYPE:
  96.                     var o = [], i;
  97.                     while (i == r.iterateNext())
  98.                         o.push(i);
  99.  
  100.                     return o;
  101.             }
  102.             return null;
  103.         default:
  104.             throw(TypeError("xpath: specified type is not valid type."));
  105.     }
  106. };