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48 lines
1.4 KiB
JavaScript
48 lines
1.4 KiB
JavaScript
6 years ago
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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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