tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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unscopables-with.js (2596B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/function-forms/unscopables-with.case
      3 // - src/function-forms/default/func-expr.template
      4 /*---
      5 description: Symbol.unscopables behavior across scope boundaries (function expression)
      6 esid: sec-function-definitions-runtime-semantics-evaluation
      7 features: [globalThis, Symbol.unscopables]
      8 flags: [generated, noStrict]
      9 info: |
     10    FunctionExpression : function ( FormalParameters ) { FunctionBody }
     11 
     12        [...]
     13        3. Let closure be FunctionCreate(Normal, FormalParameters, FunctionBody,
     14           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    Let envRec be lex's EnvironmentRecord.
     42    Let exists be ? envRec.HasBinding(name).
     43 
     44    HasBinding
     45 
     46    ...
     47    If the withEnvironment flag of envRec is false, return true.
     48    Let unscopables be ? Get(bindings, @@unscopables).
     49    If Type(unscopables) is Object, then
     50       Let blocked be ToBoolean(? Get(unscopables, N)).
     51       If blocked is true, return false.
     52 
     53    (The `with` Statement) Runtime Semantics: Evaluation
     54 
     55    ...
     56    Set the withEnvironment flag of newEnv’s EnvironmentRecord to true.
     57    ...
     58 
     59 ---*/
     60 let count = 0;
     61 var v = 1;
     62 globalThis[Symbol.unscopables] = {
     63  v: true,
     64 };
     65 
     66 {
     67  count++;
     68 
     69 var callCount = 0;
     70 // Stores a reference `ref` for case evaluation
     71 var ref;
     72 ref = function(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);
     91 
     92 assert.sameValue(callCount, 1, 'function invoked exactly once');
     93 
     94  count++;
     95 }
     96 assert.sameValue(count, 6, 'The value of `count` is 6');
     97 
     98 reportCompare(0, 0);