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47 lines
1.4 KiB
47 lines
1.4 KiB
var isFunction = require('./isFunction'), |
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isMasked = require('./_isMasked'), |
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isObject = require('./isObject'), |
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toSource = require('./_toSource'); |
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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 = /^\[object .+?Constructor\]$/; |
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/** Used for built-in method references. */ |
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var funcProto = Function.prototype, |
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objectProto = Object.prototype; |
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/** Used to resolve the decompiled source of functions. */ |
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var funcToString = funcProto.toString; |
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/** Used to check objects for own properties. */ |
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var hasOwnProperty = objectProto.hasOwnProperty; |
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/** Used to detect if a method is native. */ |
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var reIsNative = RegExp('^' + |
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funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&') |
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.replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$' |
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); |
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/** |
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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) ? reIsNative : reIsHostCtor; |
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return pattern.test(toSource(value)); |
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} |
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module.exports = baseIsNative;
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