tor-browser

The Tor Browser
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left-hand-side-private-reference-accessor-property-short-circuit-or.js (2199B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/logical-assignment-private/or.case
      3 // - src/logical-assignment-private/default/getter-setter-short-circuit.template
      4 /*---
      5 description: Logical-or assignment with target being a private reference (to an accessor property with getter and setter (short-circuit version))
      6 esid: sec-assignment-operators-runtime-semantics-evaluation
      7 features: [class-fields-private, logical-assignment-operators]
      8 flags: [generated]
      9 info: |
     10    sec-property-accessors-runtime-semantics-evaluation
     11    MemberExpression : MemberExpression `.` PrivateIdentifier
     12 
     13      1. Let _baseReference_ be the result of evaluating |MemberExpression|.
     14      2. Let _baseValue_ be ? GetValue(_baseReference_).
     15      3. Let _fieldNameString_ be the StringValue of |PrivateIdentifier|.
     16      4. Return ! MakePrivateReference(_baseValue_, _fieldNameString_).
     17 
     18    PutValue (V, W)
     19      ...
     20      5.b. If IsPrivateReference(_V_) is *true*, then
     21        i. Return ? PrivateSet(_baseObj_, _V_.[[ReferencedName]], _W_).
     22 
     23    PrivateSet (O, P, value)
     24      ...
     25      5.a. Assert: _entry_.[[Kind]] is ~accessor~.
     26      ...
     27      5.c. Let _setter_ be _entry_.[[Set]].
     28      d. Perform ? Call(_setter_, _O_, « _value_ »).
     29 
     30 
     31    sec-assignment-operators-runtime-semantics-evaluation
     32    AssignmentExpression : LeftHandSideExpression ||= AssignmentExpression
     33      1. Let _lref_ be the result of evaluating |LeftHandSideExpression|.
     34      2. Let _lval_ be ? GetValue(_lref_).
     35      3. Let _lbool_ be ! ToBoolean(_lval_).
     36      4. If _lbool_ is *true*, return _lval_.
     37      ...
     38      7. Perform ? PutValue(_lref_, _rval_).
     39      8. Return _rval_.
     40 ---*/
     41 
     42 
     43 function doNotCall() {
     44  throw new Test262Error("The right-hand side should not be evaluated");
     45 }
     46 
     47 class C {
     48  setterWasCalled = false;
     49  get #field() {
     50    return true;
     51  }
     52  set #field(value) {
     53    this.setterWasCalled = true;
     54  }
     55  compoundAssignment() {
     56    return this.#field ||= doNotCall();
     57  }
     58 }
     59 
     60 const o = new C();
     61 assert.sameValue(o.compoundAssignment(), true, "The expression should evaluate to the short-circuit value");
     62 assert(!o.setterWasCalled, "The setter should not be called");
     63 
     64 reportCompare(0, 0);