tor-browser

The Tor Browser
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gen-meth-dflt-params-arg-val-not-undefined.js (3234B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/function-forms/dflt-params-arg-val-not-undefined.case
      3 // - src/function-forms/default/gen-meth.template
      4 /*---
      5 description: Use of initializer when argument value is not `undefined` (generator method)
      6 esid: sec-generator-function-definitions-runtime-semantics-propertydefinitionevaluation
      7 features: [default-parameters, generators]
      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 
     46    14.1.19 Runtime Semantics: IteratorBindingInitialization
     47 
     48    FormalsList : FormalsList , FormalParameter
     49 
     50    [...]
     51    23. Let iteratorRecord be Record {[[Iterator]]:
     52        CreateListIterator(argumentsList), [[Done]]: false}.
     53    24. If hasDuplicates is true, then
     54        [...]
     55    25. Else,
     56        a. Perform ? IteratorBindingInitialization for formals with
     57           iteratorRecord and env as arguments.
     58    [...]
     59 
     60 ---*/
     61 var obj = {};
     62 var falseCount = 0;
     63 var stringCount = 0;
     64 var nanCount = 0;
     65 var zeroCount = 0;
     66 var nullCount = 0;
     67 var objCount = 0;
     68 
     69 var callCount = 0;
     70 var obj = {
     71  *method(aFalse = falseCount +=1, aString = stringCount += 1, aNaN = nanCount += 1, a0 = zeroCount += 1, aNull = nullCount += 1, aObj = objCount +=1) {
     72    assert.sameValue(aFalse, false);
     73    assert.sameValue(aString, '');
     74    assert.sameValue(aNaN, NaN);
     75    assert.sameValue(a0, 0);
     76    assert.sameValue(aNull, null);
     77    assert.sameValue(aObj, obj);
     78    callCount = callCount + 1;
     79  }
     80 };
     81 
     82 obj.method(false, '', NaN, 0, null, obj).next();
     83 
     84 // Stores a reference `ref` for case evaluation
     85 var ref = obj.method;
     86 
     87 assert.sameValue(callCount, 1, 'generator method invoked exactly once');
     88 
     89 assert.sameValue(falseCount, 0, 'initializer not evaluated: false');
     90 assert.sameValue(stringCount, 0, 'initializer not evaluated: string');
     91 assert.sameValue(nanCount, 0, 'initializer not evaluated: NaN');
     92 assert.sameValue(zeroCount, 0, 'initializer not evaluated: 0');
     93 assert.sameValue(nullCount, 0, 'initializer not evaluated: null');
     94 assert.sameValue(objCount, 0, 'initializer not evaluated: object');
     95 
     96 reportCompare(0, 0);