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backend/node_modules/domutils/lib/helpers.js

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