137 lines
3.8 KiB
JavaScript
137 lines
3.8 KiB
JavaScript
/**
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* lodash 3.9.1 (Custom Build) <https://lodash.com/>
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* Build: `lodash modern modularize exports="npm" -o ./`
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* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <https://lodash.com/license>
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*/
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/** `Object#toString` result references. */
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var funcTag = '[object Function]';
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/** Used to detect host constructors (Safari > 5). */
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var reIsHostCtor = /^\[object .+?Constructor\]$/;
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/**
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* Checks if `value` is object-like.
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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 object-like, else `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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/** Used for native method references. */
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var objectProto = Object.prototype;
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/** Used to resolve the decompiled source of functions. */
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var fnToString = Function.prototype.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 [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
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* of values.
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*/
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var objToString = 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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fnToString.call(hasOwnProperty).replace(/[\\^$.*+?()[\]{}|]/g, '\\$&')
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.replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
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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 = object == null ? undefined : object[key];
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return isNative(value) ? value : undefined;
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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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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is correctly classified, 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 older versions of Chrome and Safari which return 'function' for regexes
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// and Safari 8 equivalents which return 'object' for typed array constructors.
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return isObject(value) && objToString.call(value) == funcTag;
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}
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/**
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* Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
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* (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
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*
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* @static
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* @memberOf _
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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 object, else `false`.
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* @example
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*
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* _.isObject({});
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* // => true
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*
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* _.isObject([1, 2, 3]);
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* // => true
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*
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* _.isObject(1);
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* // => false
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*/
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function isObject(value) {
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// Avoid a V8 JIT bug in Chrome 19-20.
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// See https://code.google.com/p/v8/issues/detail?id=2291 for more details.
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var type = typeof value;
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return !!value && (type == 'object' || type == 'function');
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}
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/**
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* Checks if `value` is a native function.
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*
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* @static
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* @memberOf _
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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 native function, else `false`.
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* @example
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*
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* _.isNative(Array.prototype.push);
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* // => true
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*
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* _.isNative(_);
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* // => false
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*/
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function isNative(value) {
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if (value == null) {
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return false;
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}
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if (isFunction(value)) {
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return reIsNative.test(fnToString.call(value));
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}
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return isObjectLike(value) && reIsHostCtor.test(value);
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}
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module.exports = getNative;
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