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- import { Engine } from './engine.js';
- import * as EngineConst from '../common/engine_const.js';
- import { SystemExternal } from './system_external.js';
- function xpathSupported() {
- if (typeof XPathResult === 'undefined') {
- return false;
- }
- return true;
- }
- export const xpath = {
- currentDocument: null,
- evaluate: xpathSupported()
- ? document.evaluate
- : SystemExternal.xpath.evaluate,
- result: xpathSupported() ? XPathResult : SystemExternal.xpath.XPathResult,
- createNSResolver: xpathSupported()
- ? document.createNSResolver
- : SystemExternal.xpath.createNSResolver
- };
- const nameSpaces = {
- xhtml: 'http://www.w3.org/1999/xhtml',
- mathml: 'http://www.w3.org/1998/Math/MathML',
- mml: 'http://www.w3.org/1998/Math/MathML',
- svg: 'http://www.w3.org/2000/svg'
- };
- export function resolveNameSpace(prefix) {
- return nameSpaces[prefix] || null;
- }
- class Resolver {
- constructor() {
- this.lookupNamespaceURI = resolveNameSpace;
- }
- }
- function evaluateXpath(expression, rootNode, type) {
- return Engine.getInstance().mode === EngineConst.Mode.HTTP &&
- !Engine.getInstance().isIE &&
- !Engine.getInstance().isEdge
- ? xpath.currentDocument.evaluate(expression, rootNode, resolveNameSpace, type, null)
- : xpath.evaluate(expression, rootNode, new Resolver(), type, null);
- }
- export function evalXPath(expression, rootNode) {
- let iterator;
- try {
- iterator = evaluateXpath(expression, rootNode, xpath.result.ORDERED_NODE_ITERATOR_TYPE);
- }
- catch (_err) {
- return [];
- }
- const results = [];
- for (let xpathNode = iterator.iterateNext(); xpathNode; xpathNode = iterator.iterateNext()) {
- results.push(xpathNode);
- }
- return results;
- }
- export function evaluateBoolean(expression, rootNode) {
- let result;
- try {
- result = evaluateXpath(expression, rootNode, xpath.result.BOOLEAN_TYPE);
- }
- catch (_err) {
- return false;
- }
- return result.booleanValue;
- }
- export function evaluateString(expression, rootNode) {
- let result;
- try {
- result = evaluateXpath(expression, rootNode, xpath.result.STRING_TYPE);
- }
- catch (_err) {
- return '';
- }
- return result.stringValue;
- }
- export function updateEvaluator(node) {
- if (Engine.getInstance().mode !== EngineConst.Mode.HTTP)
- return;
- let parent = node;
- while (parent && !parent.evaluate) {
- parent = parent.parentNode;
- }
- if (parent && parent.evaluate) {
- xpath.currentDocument = parent;
- }
- else if (node.ownerDocument) {
- xpath.currentDocument = node.ownerDocument;
- }
- }
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