tor-browser

The Tor Browser
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gen-meth-dflt-ary-init-iter-close.js (2383B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-init-iter-close.case
      3 // - src/dstr-binding/default/gen-method-dflt.template
      4 /*---
      5 description: Iterator is closed when not exhausted by pattern evaluation (generator method (default parameter))
      6 esid: sec-generator-function-definitions-runtime-semantics-propertydefinitionevaluation
      7 features: [Symbol.iterator, generators, destructuring-binding, default-parameters]
      8 flags: [generated]
      9 info: |
     10    GeneratorMethod :
     11        * PropertyName ( StrictFormalParameters ) { GeneratorBody }
     12 
     13    1. Let propKey be the result of evaluating PropertyName.
     14    2. ReturnIfAbrupt(propKey).
     15    3. If the function code for this GeneratorMethod is strict mode code,
     16       let strict be true. Otherwise let strict be false.
     17    4. Let scope be the running execution context's LexicalEnvironment.
     18    5. Let closure be GeneratorFunctionCreate(Method,
     19       StrictFormalParameters, GeneratorBody, scope, strict).
     20    [...]
     21 
     22    9.2.1 [[Call]] ( thisArgument, argumentsList)
     23 
     24    [...]
     25    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     26    [...]
     27 
     28    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     29 
     30    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     31    [...]
     32 
     33    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     34 
     35    [...]
     36    23. Let iteratorRecord be Record {[[iterator]]:
     37        CreateListIterator(argumentsList), [[done]]: false}.
     38    24. If hasDuplicates is true, then
     39        [...]
     40    25. Else,
     41        b. Let formalStatus be IteratorBindingInitialization for formals with
     42           iteratorRecord and env as arguments.
     43    [...]
     44 
     45    13.3.3.5 Runtime Semantics: BindingInitialization
     46 
     47    BindingPattern : ArrayBindingPattern
     48 
     49    [...]
     50    4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator,
     51       result).
     52    [...]
     53 
     54 ---*/
     55 var doneCallCount = 0;
     56 var iter = {};
     57 iter[Symbol.iterator] = function() {
     58  return {
     59    next: function() {
     60      return { value: null, done: false };
     61    },
     62    return: function() {
     63      doneCallCount += 1;
     64      return {};
     65    }
     66  };
     67 };
     68 
     69 var callCount = 0;
     70 var obj = {
     71  *method([x] = iter) {
     72    assert.sameValue(doneCallCount, 1);
     73    callCount = callCount + 1;
     74  }
     75 };
     76 
     77 obj.method().next();
     78 assert.sameValue(callCount, 1, 'generator method invoked exactly once');
     79 
     80 reportCompare(0, 0);