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node_modules/@mixmark-io/domino/ContainerNode.js

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+"use strict";
+module.exports = ContainerNode;
+
+var Node = require('./Node');
+var NodeList = require('./NodeList');
+
+// This class defines common functionality for node subtypes that
+// can have children
+
+function ContainerNode() {
+  Node.call(this);
+  this._firstChild = this._childNodes = null;
+}
+
+// Primary representation is a circular linked list of siblings
+ContainerNode.prototype = Object.create(Node.prototype, {
+
+  hasChildNodes: { value: function() {
+    if (this._childNodes) {
+      return this._childNodes.length > 0;
+    }
+    return this._firstChild !== null;
+  }},
+
+  childNodes: { get: function() {
+    this._ensureChildNodes();
+    return this._childNodes;
+  }},
+
+  firstChild: { get: function() {
+    if (this._childNodes) {
+      return this._childNodes.length === 0 ? null : this._childNodes[0];
+    }
+    return this._firstChild;
+  }},
+
+  lastChild: { get: function() {
+    var kids = this._childNodes, first;
+    if (kids) {
+      return kids.length === 0 ? null: kids[kids.length-1];
+    }
+    first = this._firstChild;
+    if (first === null) { return null; }
+    return first._previousSibling; // circular linked list
+  }},
+
+  _ensureChildNodes: { value: function() {
+    if (this._childNodes) { return; }
+    var first = this._firstChild,
+        kid = first,
+        childNodes = this._childNodes = new NodeList();
+    if (first) do {
+      childNodes.push(kid);
+      kid = kid._nextSibling;
+    } while (kid !== first); // circular linked list
+    this._firstChild = null; // free memory
+  }},
+
+  // Remove all of this node's children.  This is a minor
+  // optimization that only calls modify() once.
+  removeChildren: { value: function removeChildren() {
+    var root = this.rooted ? this.ownerDocument : null,
+        next = this.firstChild,
+        kid;
+    while (next !== null) {
+      kid = next;
+      next = kid.nextSibling;
+
+      if (root) root.mutateRemove(kid);
+      kid.parentNode = null;
+    }
+    if (this._childNodes) {
+      this._childNodes.length = 0;
+    } else {
+      this._firstChild = null;
+    }
+    this.modify(); // Update last modified type once only
+  }},
+
+});