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126 lines
4.4 KiB
126 lines
4.4 KiB
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.uniqueSort = exports.compareDocumentPosition = exports.removeSubsets = void 0;
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var domhandler_1 = require("domhandler");
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/**
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* Given an array of nodes, remove any member that is contained by another.
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*
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* @param nodes Nodes to filter.
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* @returns Remaining nodes that aren't subtrees of each other.
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*/
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function removeSubsets(nodes) {
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var idx = nodes.length;
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/*
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* Check if each node (or one of its ancestors) is already contained in the
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* array.
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*/
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while (--idx >= 0) {
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var node = nodes[idx];
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/*
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* Remove the node if it is not unique.
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* We are going through the array from the end, so we only
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* have to check nodes that preceed the node under consideration in the array.
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*/
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if (idx > 0 && nodes.lastIndexOf(node, idx - 1) >= 0) {
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nodes.splice(idx, 1);
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continue;
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}
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for (var ancestor = node.parent; ancestor; ancestor = ancestor.parent) {
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if (nodes.includes(ancestor)) {
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nodes.splice(idx, 1);
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break;
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}
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}
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}
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return nodes;
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}
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exports.removeSubsets = removeSubsets;
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/**
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* Compare the position of one node against another node in any other document.
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* The return value is a bitmask with the following values:
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*
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* Document order:
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* > There is an ordering, document order, defined on all the nodes in the
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* > document corresponding to the order in which the first character of the
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* > XML representation of each node occurs in the XML representation of the
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* > document after expansion of general entities. Thus, the document element
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* > node will be the first node. Element nodes occur before their children.
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* > Thus, document order orders element nodes in order of the occurrence of
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* > their start-tag in the XML (after expansion of entities). The attribute
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* > nodes of an element occur after the element and before its children. The
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* > relative order of attribute nodes is implementation-dependent./
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*
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* Source:
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* http://www.w3.org/TR/DOM-Level-3-Core/glossary.html#dt-document-order
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*
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* @param nodeA The first node to use in the comparison
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* @param nodeB The second node to use in the comparison
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* @returns A bitmask describing the input nodes' relative position.
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*
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* See http://dom.spec.whatwg.org/#dom-node-comparedocumentposition for
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* a description of these values.
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*/
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function compareDocumentPosition(nodeA, nodeB) {
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var aParents = [];
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var bParents = [];
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if (nodeA === nodeB) {
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return 0;
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}
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var current = (0, domhandler_1.hasChildren)(nodeA) ? nodeA : nodeA.parent;
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while (current) {
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aParents.unshift(current);
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current = current.parent;
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}
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current = (0, domhandler_1.hasChildren)(nodeB) ? nodeB : nodeB.parent;
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while (current) {
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bParents.unshift(current);
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current = current.parent;
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}
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var maxIdx = Math.min(aParents.length, bParents.length);
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var idx = 0;
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while (idx < maxIdx && aParents[idx] === bParents[idx]) {
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idx++;
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}
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if (idx === 0) {
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return 1 /* DISCONNECTED */;
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}
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var sharedParent = aParents[idx - 1];
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var siblings = sharedParent.children;
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var aSibling = aParents[idx];
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var bSibling = bParents[idx];
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if (siblings.indexOf(aSibling) > siblings.indexOf(bSibling)) {
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if (sharedParent === nodeB) {
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return 4 /* FOLLOWING */ | 16 /* CONTAINED_BY */;
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}
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return 4 /* FOLLOWING */;
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}
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if (sharedParent === nodeA) {
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return 2 /* PRECEDING */ | 8 /* CONTAINS */;
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}
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return 2 /* PRECEDING */;
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}
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exports.compareDocumentPosition = compareDocumentPosition;
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/**
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* Sort an array of nodes based on their relative position in the document and
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* remove any duplicate nodes. If the array contains nodes that do not belong
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* to the same document, sort order is unspecified.
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*
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* @param nodes Array of DOM nodes.
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* @returns Collection of unique nodes, sorted in document order.
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*/
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function uniqueSort(nodes) {
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nodes = nodes.filter(function (node, i, arr) { return !arr.includes(node, i + 1); });
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nodes.sort(function (a, b) {
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var relative = compareDocumentPosition(a, b);
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if (relative & 2 /* PRECEDING */) {
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return -1;
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}
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else if (relative & 4 /* FOLLOWING */) {
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return 1;
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}
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return 0;
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});
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return nodes;
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}
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exports.uniqueSort = uniqueSort;
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