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/**
* @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
*/
/**
* @module utils/arestructuresconnected
*/
/* globals EventTarget, Event */
/**
* Traverses both structures to find out whether there is a reference that is shared between both structures.
*
* @param {Object|Array} obj1
* @param {Object|Array} obj2
*/
export default function areConnectedThroughProperties( obj1, obj2 ) {
if ( obj1 === obj2 && isObject( obj1 ) ) {
return true;
}
const subNodes1 = getSubNodes( obj1 );
const subNodes2 = getSubNodes( obj2 );
for ( const node of subNodes1 ) {
if ( subNodes2.has( node ) ) {
return true;
}
}
return false;
}
// Traverses JS structure and stores all sub-nodes, including the head node.
// It walks into each iterable structures with the `try catch` block to omit errors that might be thrown during
// tree walking. All primitives, functions and built-ins are skipped.
function getSubNodes( head ) {
const nodes = [ head ];
// Nodes are stored to prevent infinite looping.
const subNodes = new Set();
while ( nodes.length > 0 ) {
const node = nodes.shift();
if ( subNodes.has( node ) || shouldNodeBeSkipped( node ) ) {
continue;
}
subNodes.add( node );
// Handle arrays, maps, sets, custom collections that implements `[ Symbol.iterator ]()`, etc.
if ( node[ Symbol.iterator ] ) {
// The custom editor iterators might cause some problems if the editor is crashed.
try {
nodes.push( ...node );
} catch ( err ) {
// eslint-disable-line no-empty
}
} else {
nodes.push( ...Object.values( node ) );
}
}
return subNodes;
}
function shouldNodeBeSkipped( node ) {
const type = Object.prototype.toString.call( node );
return (
type === '[object Number]' ||
type === '[object Boolean]' ||
type === '[object String]' ||
type === '[object Symbol]' ||
type === '[object Function]' ||
type === '[object Date]' ||
type === '[object RegExp]' ||
node === undefined ||
node === null ||
// Skip native DOM objects, e.g. Window, nodes, events, etc.
node instanceof EventTarget ||
node instanceof Event
);
}
function isObject( structure ) {
return typeof structure === 'object' && structure !== null;
}