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59 lines
1.3 KiB
JavaScript
59 lines
1.3 KiB
JavaScript
import {
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DOCUMENT_NODE,
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ELEMENT_NODE,
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TEXT_NODE,
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CDATA_SECTION_NODE,
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COMMENT_NODE,
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SHOW_ALL,
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SHOW_ELEMENT,
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SHOW_CDATA_SECTION,
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SHOW_COMMENT,
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SHOW_TEXT
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} from '../shared/constants.js';
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import {PRIVATE, END, NEXT} from '../shared/symbols.js';
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const isOK = ({nodeType}, mask) => {
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switch (nodeType) {
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case ELEMENT_NODE:
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return mask & SHOW_ELEMENT;
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case TEXT_NODE:
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return mask & SHOW_TEXT;
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case COMMENT_NODE:
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return mask & SHOW_COMMENT;
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case CDATA_SECTION_NODE:
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return mask & SHOW_CDATA_SECTION;
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}
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return 0;
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};
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/**
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* @implements globalThis.TreeWalker
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*/
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export class TreeWalker {
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constructor(root, whatToShow = SHOW_ALL) {
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this.root = root;
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this.currentNode = root;
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this.whatToShow = whatToShow;
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let {[NEXT]: next, [END]: end} = root;
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if (root.nodeType === DOCUMENT_NODE) {
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const {documentElement} = root;
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next = documentElement;
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end = documentElement[END];
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}
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const nodes = [];
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while (next && next !== end) {
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if (isOK(next, whatToShow))
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nodes.push(next);
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next = next[NEXT];
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}
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this[PRIVATE] = {i: 0, nodes};
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}
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nextNode() {
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const $ = this[PRIVATE];
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this.currentNode = $.i < $.nodes.length ? $.nodes[$.i++] : null;
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return this.currentNode;
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}
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}
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