ParentNode-impl.js
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"use strict";
const idlUtils = require("../generated/utils");
const NodeList = require("../generated/NodeList");
const HTMLCollection = require("../generated/HTMLCollection");
const { addNwsapi } = require("../helpers/selectors");
const { domSymbolTree } = require("../helpers/internal-constants");
const NODE_TYPE = require("../node-type");
const { convertNodesIntoNode } = require("../node");
class ParentNodeImpl {
get children() {
if (!this._childrenList) {
this._childrenList = HTMLCollection.createImpl(this._globalObject, [], {
element: this,
query: () => domSymbolTree.childrenToArray(this, {
filter: node => node.nodeType === NODE_TYPE.ELEMENT_NODE
})
});
} else {
this._childrenList._update();
}
return this._childrenList;
}
get firstElementChild() {
for (const child of domSymbolTree.childrenIterator(this)) {
if (child.nodeType === NODE_TYPE.ELEMENT_NODE) {
return child;
}
}
return null;
}
get lastElementChild() {
for (const child of domSymbolTree.childrenIterator(this, { reverse: true })) {
if (child.nodeType === NODE_TYPE.ELEMENT_NODE) {
return child;
}
}
return null;
}
get childElementCount() {
return this.children.length;
}
prepend(...nodes) {
this._preInsert(convertNodesIntoNode(this._ownerDocument, nodes), this.firstChild);
}
append(...nodes) {
this._append(convertNodesIntoNode(this._ownerDocument, nodes));
}
querySelector(selectors) {
if (shouldAlwaysSelectNothing(this)) {
return null;
}
const matcher = addNwsapi(this);
return idlUtils.implForWrapper(matcher.first(selectors, idlUtils.wrapperForImpl(this)));
}
// Warning for internal users: this returns a NodeList containing IDL wrappers instead of impls
querySelectorAll(selectors) {
if (shouldAlwaysSelectNothing(this)) {
return NodeList.create(this._globalObject, [], { nodes: [] });
}
const matcher = addNwsapi(this);
const list = matcher.select(selectors, idlUtils.wrapperForImpl(this));
return NodeList.create(this._globalObject, [], { nodes: list.map(n => idlUtils.tryImplForWrapper(n)) });
}
}
function shouldAlwaysSelectNothing(elImpl) {
// This is true during initialization.
return elImpl === elImpl._ownerDocument && !elImpl.documentElement;
}
module.exports = {
implementation: ParentNodeImpl
};