tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

unscopables-with.js (2664B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/function-forms/unscopables-with.case
      3 // - src/function-forms/default/gen-func-decl.template
      4 /*---
      5 description: Symbol.unscopables behavior across scope boundaries (generator function declaration)
      6 esid: sec-generator-function-definitions-runtime-semantics-instantiatefunctionobject
      7 features: [globalThis, Symbol.unscopables, generators]
      8 flags: [generated, noStrict]
      9 info: |
     10    GeneratorDeclaration : function * ( FormalParameters ) { GeneratorBody }
     11 
     12        [...]
     13        2. Let F be GeneratorFunctionCreate(Normal, FormalParameters,
     14           GeneratorBody, scope, strict).
     15        [...]
     16 
     17    9.2.1 [[Call]] ( thisArgument, argumentsList)
     18 
     19    [...]
     20    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     21    [...]
     22 
     23    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     24 
     25    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     26    [...]
     27 
     28    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     29 
     30    [...]
     31    23. Let iteratorRecord be Record {[[iterator]]:
     32        CreateListIterator(argumentsList), [[done]]: false}.
     33    24. If hasDuplicates is true, then
     34        [...]
     35    25. Else,
     36        b. Let formalStatus be IteratorBindingInitialization for formals with
     37           iteratorRecord and env as arguments.
     38    [...]
     39 
     40 
     41    ...
     42    Let envRec be lex's EnvironmentRecord.
     43    Let exists be ? envRec.HasBinding(name).
     44 
     45    HasBinding
     46 
     47    ...
     48    If the withEnvironment flag of envRec is false, return true.
     49    Let unscopables be ? Get(bindings, @@unscopables).
     50    If Type(unscopables) is Object, then
     51       Let blocked be ToBoolean(? Get(unscopables, N)).
     52       If blocked is true, return false.
     53 
     54    (The `with` Statement) Runtime Semantics: Evaluation
     55 
     56    ...
     57    Set the withEnvironment flag of newEnv’s EnvironmentRecord to true.
     58    ...
     59 
     60 ---*/
     61 let count = 0;
     62 var v = 1;
     63 globalThis[Symbol.unscopables] = {
     64  v: true,
     65 };
     66 
     67 {
     68  count++;
     69 
     70 var callCount = 0;
     71 // Stores a reference `ref` for case evaluation
     72 function* ref(x) {
     73  count++;
     74  with (globalThis) {
     75    count++;
     76    assert.sameValue(v, undefined, 'The value of `v` is expected to equal `undefined`');
     77  }
     78  count++;
     79  var v = x;
     80  with (globalThis) {
     81    count++;
     82    assert.sameValue(v, 10, 'The value of `v` is 10');
     83    v = 20;
     84  }
     85  assert.sameValue(v, 20, 'The value of `v` is 20');
     86  assert.sameValue(globalThis.v, 1, 'The value of globalThis.v is 1');
     87  callCount = callCount + 1;
     88 }
     89 
     90 ref(10).next();
     91 
     92 assert.sameValue(callCount, 1, 'generator function invoked exactly once');
     93 
     94  count++;
     95 }
     96 assert.sameValue(count, 6, 'The value of `count` is 6');
     97 
     98 reportCompare(0, 0);