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xpath Function
// ==UserScript==
// @name Includes : XPath
// @description xpath Function
// @author You
// @version 1.0
// @language en
// @include nowhere
// @namespace https://greasyfork.org/users/1385333
// ==/UserScript==
/**************************************************************************
Author 's NOTE
Original http://lowreal.net/blog/2007/11/17/1
***************************************************************************
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
**************************************************************************/
const XPath = Xpath = xpath = (...args) => {
let [expression, context, type] = args; // Destructuring arguments
if (typeof context === "function") {
type = context;
context = null;
}
if (!context) context = document.documentElement || document;
const documentInstance = context.ownerDocument || context;
const evaluator = documentInstance.createExpression(expression, (prefix) => {
const ns = documentInstance.createNSResolver(context).lookupNamespaceURI(prefix);
if (ns) return ns;
switch (context.contentType) {
case "text/xhtml":
case "application/xhtml+xml":
return "http://www.w3.org/1999/xhtml";
default:
return "";
}
});
switch (type) {
case String:
return evaluator.evaluate(context, XPathResult.STRING_TYPE, null).stringValue;
case Number:
return evaluator.evaluate(context, XPathResult.NUMBER_TYPE, null).numberValue;
case Boolean:
return evaluator.evaluate(context, XPathResult.BOOLEAN_TYPE, null).booleanValue;
case Array: {
const result = evaluator.evaluate(context, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
const resultArray = [];
for (let i = 0; i < result.snapshotLength; i++) {
resultArray.push(result.snapshotItem(i));
}
return resultArray;
}
case undefined: {
const result = evaluator.evaluate(context, XPathResult.ANY_TYPE, null);
switch (result.resultType) {
case XPathResult.STRING_TYPE:
return result.stringValue;
case XPathResult.NUMBER_TYPE:
return result.numberValue;
case XPathResult.BOOLEAN_TYPE:
return result.booleanValue;
case XPathResult.UNORDERED_NODE_ITERATOR_TYPE: {
const nodes = [];
let node;
while ((node = result.iterateNext())) {
nodes.push(node);
}
return nodes;
}
default:
return null;
}
}
default:
throw new TypeError("xpath: specified type is not a valid type.");
}
};