test/mjsunit/value-wrapper.js

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// When calling user-defined functions on strings, booleans or
// numbers, we should create a wrapper object.

function RunTests() {
  for (var i = 0; i < 10; i++) {
    assertEquals('object', 'xxx'.TypeOfThis());
    assertEquals('object', true.TypeOfThis(2,3));
    assertEquals('object', false.TypeOfThis());
    assertEquals('object', (42).TypeOfThis());
    assertEquals('object', (3.14).TypeOfThis());
  }
  
  for (var i = 0; i < 10; i++) {
    assertEquals('object', 'xxx'['TypeOfThis']());
    assertEquals('object', true['TypeOfThis']());
    assertEquals('object', false['TypeOfThis']());
    assertEquals('object', (42)['TypeOfThis']());
    assertEquals('object', (3.14)['TypeOfThis']());
  }
  
  function CallTypeOfThis(obj) {
    assertEquals('object', obj.TypeOfThis());
  }
  
  for (var i = 0; i < 10; i++) {
    CallTypeOfThis('xxx');
    CallTypeOfThis(true);
    CallTypeOfThis(false);
    CallTypeOfThis(42);
    CallTypeOfThis(3.14);
  }
  
  function TestWithWith(obj) {
    with (obj) {
      for (var i = 0; i < 10; i++) {
        assertEquals('object', TypeOfThis());
      }
    }
  }
  
  TestWithWith('xxx');
  TestWithWith(true);
  TestWithWith(false);
  TestWithWith(42);
  TestWithWith(3.14);
  
  for (var i = 0; i < 10; i++) {
    assertEquals('object', true[7]());
    assertEquals('object', false[7]());
    assertEquals('object', (42)[7]());
    assertEquals('object', (3.14)[7]());
  }
}

function TypeOfThis() { return typeof this; }

// Test with normal setup of prototype. 
String.prototype.TypeOfThis = TypeOfThis;
Boolean.prototype.TypeOfThis = TypeOfThis;
Number.prototype.TypeOfThis = TypeOfThis;
Boolean.prototype[7] = TypeOfThis;
Number.prototype[7] = TypeOfThis;
  

RunTests();

// Run test after properties have been set to a different value.
String.prototype.TypeOfThis = 'x';
Boolean.prototype.TypeOfThis = 'x';
Number.prototype.TypeOfThis = 'x';
Boolean.prototype[7] = 'x';
Number.prototype[7] = 'x';

String.prototype.TypeOfThis = TypeOfThis;
Boolean.prototype.TypeOfThis = TypeOfThis;
Number.prototype.TypeOfThis = TypeOfThis;
Boolean.prototype[7] = TypeOfThis;
Number.prototype[7] = TypeOfThis;

RunTests();

// Force the prototype into slow case and run the test again.
delete String.prototype.TypeOfThis;
delete Boolean.prototype.TypeOfThis;
delete Number.prototype.TypeOfThis;
Boolean.prototype[7];
Number.prototype[7];

String.prototype.TypeOfThis = TypeOfThis;
Boolean.prototype.TypeOfThis = TypeOfThis;
Number.prototype.TypeOfThis = TypeOfThis;
Boolean.prototype[7] = TypeOfThis;
Number.prototype[7] = TypeOfThis;

RunTests();

// According to ES3 15.3.4.3 the this value passed to Function.prototyle.apply
// should wrapped. According to ES5 it should not.
assertEquals('object', TypeOfThis.apply('xxx', []));
assertEquals('object', TypeOfThis.apply(true, []));
assertEquals('object', TypeOfThis.apply(false, []));
assertEquals('object', TypeOfThis.apply(42, []));
assertEquals('object', TypeOfThis.apply(3.14, []));

// According to ES3 15.3.4.3 the this value passed to Function.prototyle.call
// should wrapped. According to ES5 it should not.
assertEquals('object', TypeOfThis.call('xxx'));
assertEquals('object', TypeOfThis.call(true));
assertEquals('object', TypeOfThis.call(false));
assertEquals('object', TypeOfThis.call(42));
assertEquals('object', TypeOfThis.call(3.14));