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var escapeRegExp = require('../string/escapeRegExp'),
isObjectLike = require('../internal/isObjectLike');
/** `Object#toString` result references. */
var funcTag = '[object Function]';
/** Used to detect host constructors (Safari > 5). */
var reIsHostCtor = /^\[object .+?Constructor\]$/;
/** Used for native method references. */
var objectProto = Object.prototype;
/** Used to resolve the decompiled source of functions. */
var fnToString = Function.prototype.toString;
/**
* Used to resolve the [`toStringTag`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.prototype.tostring)
* of values.
*/
var objToString = objectProto.toString;
/** Used to detect if a method is native. */
var reIsNative = RegExp('^' +
escapeRegExp(objToString)
.replace(/toString|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
);
/**
* Checks if `value` is a native function.
*
* @static
* @memberOf _
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is a native function, else `false`.
* @example
*
* _.isNative(Array.prototype.push);
* // => true
*
* _.isNative(_);
* // => false
*/
function isNative(value) {
if (value == null) {
return false;
}
if (objToString.call(value) == funcTag) {
return reIsNative.test(fnToString.call(value));
}
return isObjectLike(value) && reIsHostCtor.test(value);
}
module.exports = isNative;
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