1
|
var isFunction = require('./isFunction'),
|
2
|
isMasked = require('./_isMasked'),
|
3
|
isObject = require('./isObject'),
|
4
|
toSource = require('./_toSource');
|
5
|
|
6
|
/**
|
7
|
* Used to match `RegExp`
|
8
|
* [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
|
9
|
*/
|
10
|
var reRegExpChar = /[\\^$.*+?()[\]{}|]/g;
|
11
|
|
12
|
/** Used to detect host constructors (Safari). */
|
13
|
var reIsHostCtor = /^\[object .+?Constructor\]$/;
|
14
|
|
15
|
/** Used for built-in method references. */
|
16
|
var funcProto = Function.prototype,
|
17
|
objectProto = Object.prototype;
|
18
|
|
19
|
/** Used to resolve the decompiled source of functions. */
|
20
|
var funcToString = funcProto.toString;
|
21
|
|
22
|
/** Used to check objects for own properties. */
|
23
|
var hasOwnProperty = objectProto.hasOwnProperty;
|
24
|
|
25
|
/** Used to detect if a method is native. */
|
26
|
var reIsNative = RegExp('^' +
|
27
|
funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
|
28
|
.replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
|
29
|
);
|
30
|
|
31
|
/**
|
32
|
* The base implementation of `_.isNative` without bad shim checks.
|
33
|
*
|
34
|
* @private
|
35
|
* @param {*} value The value to check.
|
36
|
* @returns {boolean} Returns `true` if `value` is a native function,
|
37
|
* else `false`.
|
38
|
*/
|
39
|
function baseIsNative(value) {
|
40
|
if (!isObject(value) || isMasked(value)) {
|
41
|
return false;
|
42
|
}
|
43
|
var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
|
44
|
return pattern.test(toSource(value));
|
45
|
}
|
46
|
|
47
|
module.exports = baseIsNative;
|