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__proto__ => getPrototypeOf

closure/master
Mike Gerwitz 2011-11-18 23:14:40 -05:00
parent 94419742c0
commit 80846e95f3
1 changed files with 13 additions and 4 deletions
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17
lib/util.js
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@ -457,6 +457,15 @@ exports.getOwnPropertyDescriptor =
}; };
/**
* Returns prototype of object, or undefined if unsupported
*/
exports.getPrototypeOf = Object.getPrototypeOf || function()
{
return undefined;
};
/** /**
* Travels down the prototype chain of the given object in search of the * Travels down the prototype chain of the given object in search of the
* requested property and returns its descriptor * requested property and returns its descriptor
@ -483,14 +492,14 @@ exports.getPropertyDescriptor = function( obj, prop, nobase )
// note that this uses util's function, not Object's // note that this uses util's function, not Object's
var desc = exports.getOwnPropertyDescriptor( obj, prop ), var desc = exports.getOwnPropertyDescriptor( obj, prop ),
next = obj.__proto__; next = exports.getPrototypeOf( obj );
// if we didn't find a descriptor and a prototype is available, recurse down // if we didn't find a descriptor and a prototype is available, recurse down
// the prototype chain, ensuring that the next prototype has a prototype if // the prototype chain, ensuring that the next prototype has a prototype if
// the base is to be excluded // the base is to be excluded
if ( !desc && next && ( !nobase || next.__proto__ ) ) if ( !desc && next && ( !nobase || exports.getPrototypeOf( next ) ) )
{ {
return exports.getPropertyDescriptor( obj.__proto__, prop, nobase ); return exports.getPropertyDescriptor( next, prop, nobase );
} }
// return the descriptor or undefined if no prototype is available // return the descriptor or undefined if no prototype is available
@ -505,7 +514,7 @@ exports.getPropertyDescriptor = function( obj, prop, nobase )
* @type {boolean} * @type {boolean}
*/ */
exports.defineSecureProp( exports.getPropertyDescriptor, 'canTraverse', exports.defineSecureProp( exports.getPropertyDescriptor, 'canTraverse',
( {}.__proto__ ) ? true : false ( Object.getPrototypeOf ) ? true : false
); );