tor-browser

The Tor Browser
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array-elem-iter-rtrn-close.js (2670B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-elem-iter-rtrn-close.case
      3 // - src/dstr-assignment/default/for-of.template
      4 /*---
      5 description: IteratorClose is called when reference evaluation produces a "return" completion (For..of statement)
      6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
      7 features: [Symbol.iterator, generators, destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    IterationStatement :
     11      for ( LeftHandSideExpression of AssignmentExpression ) Statement
     12 
     13    1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« »,
     14       AssignmentExpression, iterate).
     15    2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
     16       keyResult, assignment, labelSet).
     17 
     18    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
     19 
     20    [...]
     21    4. If destructuring is true and if lhsKind is assignment, then
     22       a. Assert: lhs is a LeftHandSideExpression.
     23       b. Let assignmentPattern be the parse of the source text corresponding to
     24          lhs using AssignmentPattern as the goal symbol.
     25    [...]
     26 
     27    ArrayAssignmentPattern : [ AssignmentElementList ]
     28 
     29    [...]
     30    5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
     31       result).
     32    6. Return result.
     33 
     34    7.4.6 IteratorClose( iterator, completion )
     35 
     36    [...]
     37    6. Let innerResult be Call(return, iterator, « »).
     38    7. If completion.[[type]] is throw, return Completion(completion).
     39    8. If innerResult.[[type]] is throw, return Completion(innerResult).
     40 
     41 ---*/
     42 var nextCount = 0;
     43 var returnCount = 0;
     44 var unreachable = 0;
     45 var thisValue = null;
     46 var args = null;
     47 var iterator = {
     48  next: function() {
     49    nextCount += 1;
     50    return {done: false, value: undefined};
     51  },
     52  return: function() {
     53    returnCount += 1;
     54    thisValue = this;
     55    args = arguments;
     56    return {};
     57  }
     58 };
     59 var iterable = {};
     60 iterable[Symbol.iterator] = function() {
     61  return iterator;
     62 };
     63 
     64 function* g() {
     65 
     66 var counter = 0;
     67 
     68 for ([ {} = yield ] of [iterable]) {
     69  unreachable += 1;
     70  counter += 1;
     71 }
     72 
     73 assert.sameValue(counter, 1);
     74 
     75 }
     76 var iter = g();
     77 iter.next();
     78 
     79 assert.sameValue(nextCount, 1);
     80 assert.sameValue(returnCount, 0);
     81 
     82 var result = iter.return(777);
     83 
     84 assert.sameValue(nextCount, 1);
     85 assert.sameValue(returnCount, 1);
     86 assert.sameValue(unreachable, 0, 'Unreachable statement was not executed');
     87 assert.sameValue(result.value, 777);
     88 assert(result.done, 'Iterator correctly closed');
     89 assert.sameValue(thisValue, iterator, 'correct `this` value');
     90 assert(!!args, 'arguments object provided');
     91 assert.sameValue(args.length, 0, 'zero arguments specified');
     92 
     93 reportCompare(0, 0);