time-to-botec

Benchmark sampling in different programming languages
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_baseIsNative.js (1417B)

      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;