debian-mirror-gitlab/core-js/internals/create-async-iterator-proxy.js

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2019-10-31 01:37:42 +05:30
'use strict';
var path = require('../internals/path');
var aFunction = require('../internals/a-function');
var anObject = require('../internals/an-object');
var create = require('../internals/object-create');
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
var redefineAll = require('../internals/redefine-all');
var wellKnownSymbol = require('../internals/well-known-symbol');
var InternalStateModule = require('../internals/internal-state');
var getBuiltIn = require('../internals/get-built-in');
var Promise = getBuiltIn('Promise');
var setInternalState = InternalStateModule.set;
var getInternalState = InternalStateModule.get;
var TO_STRING_TAG = wellKnownSymbol('toStringTag');
var $return = function (value) {
var iterator = getInternalState(this).iterator;
var $$return = iterator['return'];
return $$return === undefined
? Promise.resolve({ done: true, value: value })
: anObject($$return.call(iterator, value));
};
var $throw = function (value) {
var iterator = getInternalState(this).iterator;
var $$throw = iterator['throw'];
return $$throw === undefined
? Promise.reject(value)
: $$throw.call(iterator, value);
};
module.exports = function (nextHandler, IS_ITERATOR) {
var AsyncIteratorProxy = function AsyncIterator(state) {
state.next = aFunction(state.iterator.next);
state.done = false;
setInternalState(this, state);
};
AsyncIteratorProxy.prototype = redefineAll(create(path.AsyncIterator.prototype), {
next: function next(arg) {
var state = getInternalState(this);
if (state.done) return Promise.resolve({ done: true, value: undefined });
try {
return Promise.resolve(anObject(nextHandler.call(state, arg, Promise)));
} catch (error) {
return Promise.reject(error);
}
},
'return': $return,
'throw': $throw
});
if (!IS_ITERATOR) {
createNonEnumerableProperty(AsyncIteratorProxy.prototype, TO_STRING_TAG, 'Generator');
}
return AsyncIteratorProxy;
};