| // Copyright (C) 2016 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| esid: sec-generator-function-definitions-runtime-semantics-evaluation |
| description: Value received from invocation of generator's `throw` method |
| info: | |
| YieldExpression : yield * AssignmentExpression |
| |
| 1. Let exprRef be the result of evaluating AssignmentExpression. |
| 2. Let value be ? GetValue(exprRef). |
| 3. Let iterator be ? GetIterator(value). |
| 4. Let received be NormalCompletion(undefined). |
| 5. Repeat |
| a. If received.[[Type]] is normal, then |
| [...] |
| b. Else if received.[[Type]] is throw, then |
| i. Let throw be ? GetMethod(iterator, "throw"). |
| ii. If throw is not undefined, then |
| 1. Let innerResult be ? Call(throw, iterator, « received.[[Value]] |
| »). |
| 2. NOTE: Exceptions from the inner iterator throw method are |
| propagated. Normal completions from an inner throw method are |
| processed similarly to an inner next. |
| 3. If Type(innerResult) is not Object, throw a TypeError exception. |
| 4. Let done be ? IteratorComplete(innerResult). |
| 5. If done is true, then |
| [...] |
| 6. Let received be GeneratorYield(innerResult). |
| features: [generators, Symbol.iterator] |
| ---*/ |
| |
| var quickIter = {}; |
| var iter, exprValue, throwReceived; |
| quickIter[Symbol.iterator] = function() { |
| return { |
| next: function() { |
| return { done: false }; |
| }, |
| throw: function(x) { |
| throwReceived = x; |
| return { done: true, value: 3333 }; |
| } |
| }; |
| }; |
| function* g() { |
| exprValue = yield * quickIter; |
| } |
| |
| iter = g(); |
| |
| iter.next(); |
| iter.throw(2222); |
| assert.sameValue(throwReceived, 2222); |
| assert.sameValue(exprValue, 3333); |