third_party/WebKit/LayoutTests/fast/js/kde/script-tests/function_arguments.js

   1 // check value of arguments inside recursion
   2
   3 var expected = [null,99,1,2,3,3,2,1,99,null];
   4 var expno = 0;
   5
   6 var x = 0;
   7 shouldBe("mf.arguments", "expected[expno++]");
   8 function mf(a,b) {
   9   shouldBe("mf.arguments[0]", "expected[expno++]");
  10   x++;
  11   if (x < 4)
  12     mf(x,1);
  13   shouldBe("mf.arguments[0]", "expected[expno++]");
  14   return b;
  15 }
  16 mf(99);
  17 shouldBe("mf.arguments", "expected[expno++]");
  18
  19
  20 // check internal properties of arguments
  21
  22 // Delete
  23
  24
  25 // DontEnum
  26 var foundArgs = false;
  27
  28 var ReadOnlyOK = false;
  29 var DontDeleteOK = false;
  30 var DontEnumOK = false;
  31 function f(a,b,c) {
  32
  33   // ReadOnly
  34   var newargs = new Object();
  35   f.arguments = newargs;
  36   ReadOnlyOK = (f.arguments != newargs);
  37
  38   // DontDelete
  39   DontDeleteOK = !delete(f.arguments);
  40   if (f.arguments == undefined || !f.hasOwnProperty("arguments"))
  41     DontDeleteOK = false;
  42
  43   // DontEnum
  44   var foundArgs = false;
  45   for (i in f) {
  46     if (f == "arguments")
  47       foundArgs = true;
  48   }
  49   DontEnumOK = !foundArgs;
  50 }
  51 f(1,2,3);
  52 shouldBeTrue("ReadOnlyOK");
  53 shouldBeTrue("DontDeleteOK");
  54 shouldBeTrue("DontEnumOK");
  55
  56 // Check that parameter variables are bound to the corresponding
  57 // elements in the arguments array
  58 var arg0 = null;
  59 var arg1 = null;
  60 var arg2 = null;
  61 var newarg0 = null;
  62 var newarg1 = null;
  63 var newarg2 = null;
  64 var newx = null;
  65 var arglength = 0;
  66
  67 function dupargs(x,x,x)
  68 {
  69   arg0 = arguments[0];
  70   arg1 = arguments[1];
  71   arg2 = arguments[2];
  72   arglength = arguments.length;
  73   x = 999;
  74   newarg0 = arguments[0];
  75   newarg1 = arguments[1];
  76   newarg2 = arguments[2];
  77   arguments[2] = 888;
  78   newx = x;
  79 }
  80
  81 dupargs(1,2,3);
  82
  83 shouldBe("arg0","1");
  84 shouldBe("arg1","2");
  85 shouldBe("arg2","3");
  86 shouldBe("arglength","3");
  87 shouldBe("newarg0","1");
  88 shouldBe("newarg1","2");
  89 shouldBe("newarg2","999");
  90 shouldBe("newx","888");