mirror of
https://github.com/whoisclebs/lodash.git
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132 lines
3.7 KiB
JavaScript
132 lines
3.7 KiB
JavaScript
/**
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* lodash 3.9.0 (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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/**
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* Used to match `RegExp` [special characters](http://www.regular-expressions.info/characters.html#special).
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* In addition to special characters the forward slash is escaped to allow for
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* easier `eval` use and `Function` compilation.
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*/
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var reRegExpChars = /[.*+?^${}()|[\]\/\\]/g,
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reHasRegExpChars = RegExp(reRegExpChars.source);
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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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* Converts `value` to a string if it's not one. An empty string is returned
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* for `null` or `undefined` values.
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*
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* @private
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* @param {*} value The value to process.
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* @returns {string} Returns the string.
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*/
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function baseToString(value) {
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if (typeof value == 'string') {
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return value;
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}
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return value == null ? '' : (value + '');
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}
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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`](https://people.mozilla.org/~jorendorff/es6-draft.html#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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escapeRegExp(fnToString.call(hasOwnProperty))
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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 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 (objToString.call(value) == funcTag) {
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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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/**
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* Escapes the `RegExp` special characters "\", "/", "^", "$", ".", "|", "?",
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* "*", "+", "(", ")", "[", "]", "{" and "}" in `string`.
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*
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* @static
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* @memberOf _
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* @category String
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* @param {string} [string=''] The string to escape.
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* @returns {string} Returns the escaped string.
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* @example
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*
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* _.escapeRegExp('[lodash](https://lodash.com/)');
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* // => '\[lodash\]\(https:\/\/lodash\.com\/\)'
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*/
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function escapeRegExp(string) {
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string = baseToString(string);
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return (string && reHasRegExpChars.test(string))
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? string.replace(reRegExpChars, '\\$&')
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: string;
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}
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module.exports = getNative;
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