star-rhs-iter-thrw-thrw-invoke.js (1504B)
1 // Copyright (C) 2016 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 /*--- 4 esid: sec-generator-function-definitions-runtime-semantics-evaluation 5 es6id: 14.4.14 6 description: Invocation of iterator `throw` method 7 info: | 8 YieldExpression : yield * AssignmentExpression 9 10 1. Let exprRef be the result of evaluating AssignmentExpression. 11 2. Let value be ? GetValue(exprRef). 12 3. Let iterator be ? GetIterator(value). 13 4. Let received be NormalCompletion(undefined). 14 5. Repeat 15 a. If received.[[Type]] is normal, then 16 [...] 17 b. Else if received.[[Type]] is throw, then 18 i. Let throw be ? GetMethod(iterator, "throw"). 19 ii. If throw is not undefined, then 20 1. Let innerResult be ? Call(throw, iterator, « received.[[Value]] 21 »). 22 [...] 23 features: [generators, Symbol.iterator] 24 ---*/ 25 26 var args, thisValue; 27 var callCount = 0; 28 var spyIterator = { 29 next: function() { 30 return { done: false }; 31 }, 32 throw: function() { 33 callCount += 1; 34 args = arguments; 35 thisValue = this; 36 return { done: true }; 37 } 38 }; 39 var spyIterable = {}; 40 spyIterable[Symbol.iterator] = function() { 41 return spyIterator; 42 }; 43 function* g() { 44 yield * spyIterable; 45 } 46 var iter = g(); 47 48 iter.next(8888); 49 iter.throw(7777); 50 51 assert.sameValue(callCount, 1); 52 assert.sameValue(args.length, 1); 53 assert.sameValue(args[0], 7777); 54 assert.sameValue(thisValue, spyIterator); 55 56 reportCompare(0, 0);