tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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gen-meth-ary-ptrn-elision.js (2609B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-elision.case
      3 // - src/dstr-binding/default/gen-meth.template
      4 /*---
      5 description: Elision advances iterator (generator method)
      6 esid: sec-generator-function-definitions-runtime-semantics-propertydefinitionevaluation
      7 features: [generators, destructuring-binding]
      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    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     46 
     47    ArrayBindingPattern : [ Elision ]
     48 
     49    1. Return the result of performing
     50       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
     51       as the argument.
     52 
     53    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
     54 
     55    Elision : ,
     56 
     57    1. If iteratorRecord.[[done]] is false, then
     58       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     59       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     60       c. ReturnIfAbrupt(next).
     61       d. If next is false, set iteratorRecord.[[done]] to true.
     62    2. Return NormalCompletion(empty).
     63 
     64 ---*/
     65 var first = 0;
     66 var second = 0;
     67 function* g() {
     68  first += 1;
     69  yield;
     70  second += 1;
     71 };
     72 
     73 var callCount = 0;
     74 var obj = {
     75  *method([,]) {
     76    assert.sameValue(first, 1);
     77    assert.sameValue(second, 0);
     78    callCount = callCount + 1;
     79  }
     80 };
     81 
     82 obj.method(g()).next();
     83 assert.sameValue(callCount, 1, 'generator method invoked exactly once');
     84 
     85 reportCompare(0, 0);