583 lines
15 KiB
JavaScript
583 lines
15 KiB
JavaScript
/**
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* lodash (Custom Build) <https://lodash.com/>
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* Build: `lodash modularize exports="npm" -o ./`
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* Copyright jQuery Foundation and other contributors <https://jquery.org/>
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* Released under MIT license <https://lodash.com/license>
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* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
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* Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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*/
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/** Used as references for various `Number` constants. */
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var MAX_SAFE_INTEGER = 9007199254740991;
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/** `Object#toString` result references. */
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var argsTag = '[object Arguments]',
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funcTag = '[object Function]',
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genTag = '[object GeneratorFunction]',
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mapTag = '[object Map]',
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objectTag = '[object Object]',
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promiseTag = '[object Promise]',
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setTag = '[object Set]',
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weakMapTag = '[object WeakMap]';
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var dataViewTag = '[object DataView]';
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/**
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* Used to match `RegExp`
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* [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
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*/
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var reRegExpChar = /[\\^$.*+?()[\]{}|]/g;
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/** Used to detect host constructors (Safari). */
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var reIsHostCtor = /^\[object .+?Constructor\]$/;
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/** Detect free variable `global` from Node.js. */
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var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
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/** Detect free variable `self`. */
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var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
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/** Used as a reference to the global object. */
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var root = freeGlobal || freeSelf || Function('return this')();
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/** Detect free variable `exports`. */
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var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
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/** Detect free variable `module`. */
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var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
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/** Detect the popular CommonJS extension `module.exports`. */
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var moduleExports = freeModule && freeModule.exports === freeExports;
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/**
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* Gets the value at `key` of `object`.
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*
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* @private
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* @param {Object} [object] The object to query.
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* @param {string} key The key of the property to get.
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* @returns {*} Returns the property value.
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*/
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function getValue(object, key) {
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return object == null ? undefined : object[key];
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}
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/**
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* Checks if `value` is a host object in IE < 9.
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*
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* @private
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a host object, else `false`.
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*/
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function isHostObject(value) {
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// Many host objects are `Object` objects that can coerce to strings
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// despite having improperly defined `toString` methods.
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var result = false;
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if (value != null && typeof value.toString != 'function') {
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try {
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result = !!(value + '');
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} catch (e) {}
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}
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return result;
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}
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/**
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* Creates a unary function that invokes `func` with its argument transformed.
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*
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* @private
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* @param {Function} func The function to wrap.
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* @param {Function} transform The argument transform.
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* @returns {Function} Returns the new function.
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*/
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function overArg(func, transform) {
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return function(arg) {
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return func(transform(arg));
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};
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}
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/** Used for built-in method references. */
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var funcProto = Function.prototype,
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objectProto = Object.prototype;
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/** Used to detect overreaching core-js shims. */
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var coreJsData = root['__core-js_shared__'];
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/** Used to detect methods masquerading as native. */
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var maskSrcKey = (function() {
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var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
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return uid ? ('Symbol(src)_1.' + uid) : '';
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}());
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/** Used to resolve the decompiled source of functions. */
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var funcToString = funcProto.toString;
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/** Used to check objects for own properties. */
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var hasOwnProperty = objectProto.hasOwnProperty;
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/**
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* Used to resolve the
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* [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
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* of values.
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*/
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var objectToString = objectProto.toString;
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/** Used to detect if a method is native. */
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var reIsNative = RegExp('^' +
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funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
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.replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
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);
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/** Built-in value references. */
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var Buffer = moduleExports ? root.Buffer : undefined,
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propertyIsEnumerable = objectProto.propertyIsEnumerable;
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/* Built-in method references for those with the same name as other `lodash` methods. */
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var nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
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nativeKeys = overArg(Object.keys, Object);
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/* Built-in method references that are verified to be native. */
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var DataView = getNative(root, 'DataView'),
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Map = getNative(root, 'Map'),
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Promise = getNative(root, 'Promise'),
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Set = getNative(root, 'Set'),
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WeakMap = getNative(root, 'WeakMap');
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/** Detect if properties shadowing those on `Object.prototype` are non-enumerable. */
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var nonEnumShadows = !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf');
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/** Used to detect maps, sets, and weakmaps. */
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var dataViewCtorString = toSource(DataView),
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mapCtorString = toSource(Map),
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promiseCtorString = toSource(Promise),
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setCtorString = toSource(Set),
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weakMapCtorString = toSource(WeakMap);
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/**
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* The base implementation of `getTag`.
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*
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* @private
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* @param {*} value The value to query.
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* @returns {string} Returns the `toStringTag`.
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*/
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function baseGetTag(value) {
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return objectToString.call(value);
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}
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/**
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* The base implementation of `_.isNative` without bad shim checks.
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*
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* @private
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a native function,
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* else `false`.
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*/
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function baseIsNative(value) {
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if (!isObject(value) || isMasked(value)) {
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return false;
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}
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var pattern = (isFunction(value) || isHostObject(value)) ? reIsNative : reIsHostCtor;
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return pattern.test(toSource(value));
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}
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/**
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* Gets the native function at `key` of `object`.
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*
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* @private
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* @param {Object} object The object to query.
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* @param {string} key The key of the method to get.
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* @returns {*} Returns the function if it's native, else `undefined`.
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*/
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function getNative(object, key) {
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var value = getValue(object, key);
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return baseIsNative(value) ? value : undefined;
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}
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/**
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* Gets the `toStringTag` of `value`.
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*
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* @private
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* @param {*} value The value to query.
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* @returns {string} Returns the `toStringTag`.
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*/
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var getTag = baseGetTag;
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// Fallback for data views, maps, sets, and weak maps in IE 11,
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// for data views in Edge < 14, and promises in Node.js.
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if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
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(Map && getTag(new Map) != mapTag) ||
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(Promise && getTag(Promise.resolve()) != promiseTag) ||
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(Set && getTag(new Set) != setTag) ||
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(WeakMap && getTag(new WeakMap) != weakMapTag)) {
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getTag = function(value) {
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var result = objectToString.call(value),
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Ctor = result == objectTag ? value.constructor : undefined,
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ctorString = Ctor ? toSource(Ctor) : undefined;
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if (ctorString) {
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switch (ctorString) {
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case dataViewCtorString: return dataViewTag;
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case mapCtorString: return mapTag;
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case promiseCtorString: return promiseTag;
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case setCtorString: return setTag;
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case weakMapCtorString: return weakMapTag;
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}
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}
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return result;
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};
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}
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/**
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* Checks if `func` has its source masked.
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*
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* @private
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* @param {Function} func The function to check.
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* @returns {boolean} Returns `true` if `func` is masked, else `false`.
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*/
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function isMasked(func) {
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return !!maskSrcKey && (maskSrcKey in func);
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}
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/**
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* Checks if `value` is likely a prototype object.
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*
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* @private
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
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*/
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function isPrototype(value) {
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var Ctor = value && value.constructor,
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proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;
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return value === proto;
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}
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/**
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* Converts `func` to its source code.
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*
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* @private
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* @param {Function} func The function to process.
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* @returns {string} Returns the source code.
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*/
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function toSource(func) {
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if (func != null) {
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try {
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return funcToString.call(func);
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} catch (e) {}
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try {
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return (func + '');
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} catch (e) {}
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}
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return '';
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}
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/**
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* Checks if `value` is likely an `arguments` object.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is an `arguments` object,
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* else `false`.
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* @example
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*
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* _.isArguments(function() { return arguments; }());
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* // => true
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*
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* _.isArguments([1, 2, 3]);
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* // => false
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*/
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function isArguments(value) {
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// Safari 8.1 makes `arguments.callee` enumerable in strict mode.
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return isArrayLikeObject(value) && hasOwnProperty.call(value, 'callee') &&
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(!propertyIsEnumerable.call(value, 'callee') || objectToString.call(value) == argsTag);
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}
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/**
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* Checks if `value` is classified as an `Array` object.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is an array, else `false`.
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* @example
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*
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* _.isArray([1, 2, 3]);
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* // => true
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*
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* _.isArray(document.body.children);
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* // => false
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*
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* _.isArray('abc');
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* // => false
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*
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* _.isArray(_.noop);
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* // => false
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*/
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var isArray = Array.isArray;
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/**
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* Checks if `value` is array-like. A value is considered array-like if it's
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* not a function and has a `value.length` that's an integer greater than or
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* equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
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*
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* @static
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* @memberOf _
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* @since 4.0.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is array-like, else `false`.
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* @example
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*
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* _.isArrayLike([1, 2, 3]);
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* // => true
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*
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* _.isArrayLike(document.body.children);
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* // => true
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*
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* _.isArrayLike('abc');
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* // => true
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*
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* _.isArrayLike(_.noop);
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* // => false
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*/
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function isArrayLike(value) {
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return value != null && isLength(value.length) && !isFunction(value);
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}
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/**
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* This method is like `_.isArrayLike` except that it also checks if `value`
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* is an object.
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*
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* @static
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* @memberOf _
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* @since 4.0.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is an array-like object,
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* else `false`.
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* @example
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*
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* _.isArrayLikeObject([1, 2, 3]);
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* // => true
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*
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* _.isArrayLikeObject(document.body.children);
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* // => true
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*
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* _.isArrayLikeObject('abc');
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* // => false
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*
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* _.isArrayLikeObject(_.noop);
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* // => false
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*/
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function isArrayLikeObject(value) {
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return isObjectLike(value) && isArrayLike(value);
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}
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/**
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* Checks if `value` is a buffer.
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*
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* @static
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* @memberOf _
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* @since 4.3.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
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* @example
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*
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* _.isBuffer(new Buffer(2));
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* // => true
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*
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* _.isBuffer(new Uint8Array(2));
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* // => false
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*/
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var isBuffer = nativeIsBuffer || stubFalse;
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/**
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* Checks if `value` is an empty object, collection, map, or set.
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*
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* Objects are considered empty if they have no own enumerable string keyed
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* properties.
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*
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* Array-like values such as `arguments` objects, arrays, buffers, strings, or
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* jQuery-like collections are considered empty if they have a `length` of `0`.
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* Similarly, maps and sets are considered empty if they have a `size` of `0`.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is empty, else `false`.
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* @example
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*
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* _.isEmpty(null);
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* // => true
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*
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* _.isEmpty(true);
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* // => true
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*
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* _.isEmpty(1);
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* // => true
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*
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* _.isEmpty([1, 2, 3]);
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* // => false
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*
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* _.isEmpty({ 'a': 1 });
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* // => false
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*/
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function isEmpty(value) {
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if (isArrayLike(value) &&
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(isArray(value) || typeof value == 'string' ||
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typeof value.splice == 'function' || isBuffer(value) || isArguments(value))) {
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return !value.length;
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}
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var tag = getTag(value);
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if (tag == mapTag || tag == setTag) {
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return !value.size;
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}
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if (nonEnumShadows || isPrototype(value)) {
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return !nativeKeys(value).length;
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}
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for (var key in value) {
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if (hasOwnProperty.call(value, key)) {
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return false;
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}
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}
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return true;
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}
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/**
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* Checks if `value` is classified as a `Function` object.
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*
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* @static
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|
* @memberOf _
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* @since 0.1.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
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* @returns {boolean} Returns `true` if `value` is a function, else `false`.
|
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* @example
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*
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* _.isFunction(_);
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* // => true
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*
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* _.isFunction(/abc/);
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* // => false
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*/
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function isFunction(value) {
|
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// The use of `Object#toString` avoids issues with the `typeof` operator
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// in Safari 8-9 which returns 'object' for typed array and other constructors.
|
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var tag = isObject(value) ? objectToString.call(value) : '';
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return tag == funcTag || tag == genTag;
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}
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|
|
|
/**
|
|
* Checks if `value` is a valid array-like length.
|
|
*
|
|
* **Note:** This method is loosely based on
|
|
* [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 4.0.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
|
|
* @example
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*
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* _.isLength(3);
|
|
* // => true
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*
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* _.isLength(Number.MIN_VALUE);
|
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* // => false
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*
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* _.isLength(Infinity);
|
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* // => false
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*
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* _.isLength('3');
|
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* // => false
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*/
|
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function isLength(value) {
|
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return typeof value == 'number' &&
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value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
|
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}
|
|
|
|
/**
|
|
* Checks if `value` is the
|
|
* [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
|
|
* of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 0.1.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is an object, else `false`.
|
|
* @example
|
|
*
|
|
* _.isObject({});
|
|
* // => true
|
|
*
|
|
* _.isObject([1, 2, 3]);
|
|
* // => true
|
|
*
|
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* _.isObject(_.noop);
|
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* // => true
|
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*
|
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* _.isObject(null);
|
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* // => false
|
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*/
|
|
function isObject(value) {
|
|
var type = typeof value;
|
|
return !!value && (type == 'object' || type == 'function');
|
|
}
|
|
|
|
/**
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|
* Checks if `value` is object-like. A value is object-like if it's not `null`
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* and has a `typeof` result of "object".
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*
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* @static
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* @memberOf _
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* @since 4.0.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is object-like, else `false`.
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* @example
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*
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* _.isObjectLike({});
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* // => true
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*
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* _.isObjectLike([1, 2, 3]);
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* // => true
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|
*
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* _.isObjectLike(_.noop);
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* // => false
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|
*
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* _.isObjectLike(null);
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* // => false
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|
*/
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function isObjectLike(value) {
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|
return !!value && typeof value == 'object';
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}
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|
|
/**
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* This method returns `false`.
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*
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|
* @static
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* @memberOf _
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|
* @since 4.13.0
|
|
* @category Util
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|
* @returns {boolean} Returns `false`.
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|
* @example
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|
*
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|
* _.times(2, _.stubFalse);
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|
* // => [false, false]
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|
*/
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|
function stubFalse() {
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|
return false;
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|
}
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|
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|
module.exports = isEmpty;
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