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/* -*- mode: js; indent-tabs-mode: nil; -*- */
/* exported bind, copyProperties, copyPublicProperties, countProperties, Class,
getMetaClass, Interface */
// SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
// SPDX-FileCopyrightText: 2008 litl, LLC
// Utilities that are "meta-language" things like manipulating object props
var {Class, Interface, getMetaClass} = imports._legacy;
function countProperties(obj) {
let count = 0;
for (let unusedProperty in obj)
count += 1;
return count;
}
function getPropertyDescriptor(obj, property) {
if (obj.hasOwnProperty(property))
return Object.getOwnPropertyDescriptor(obj, property);
return getPropertyDescriptor(Object.getPrototypeOf(obj), property);
}
function _copyProperty(source, dest, property) {
let descriptor = getPropertyDescriptor(source, property);
Object.defineProperty(dest, property, descriptor);
}
function copyProperties(source, dest) {
for (let property in source)
_copyProperty(source, dest, property);
}
function copyPublicProperties(source, dest) {
for (let property in source) {
if (typeof property === 'string' && property.startsWith('_'))
continue;
else
_copyProperty(source, dest, property);
}
}
/**
* Binds obj to callback. Makes it possible to refer to "obj"
* using this within the callback.
*
* @param {object} obj the object to bind
* @param {Function} callback callback to bind obj in
* @param {*} bindArguments additional arguments to the callback
* @returns {Function} a new callback
*/
function bind(obj, callback, ...bindArguments) {
if (typeof obj !== 'object') {
throw new Error(`first argument to Lang.bind() must be an object, not ${
typeof obj}`);
}
if (typeof callback !== 'function') {
throw new Error(`second argument to Lang.bind() must be a function, not ${
typeof callback}`);
}
// Use ES5 Function.prototype.bind, but only if not passing any bindArguments,
// because ES5 has them at the beginning, not at the end
if (arguments.length === 2)
return callback.bind(obj);
let me = obj;
return function (...args) {
args = args.concat(bindArguments);
return callback.apply(me, args);
};
}
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