third_party/WebKit/LayoutTests/fast/js/eval-cross-window.html

   1 <p>
   2 This page verifies that eval, when called as a function, uses the "this" object
   3 provided by the call as its variable object, scope chain, and "this" object.
   4 However, if the "this" object is not the global object eval was originally
   5 associated with, eval throws an exception.
   6 </p>
   7 <p>If the test passes, you'll see a series of pass messages below.</p>
   8 <pre id="console"></pre>
   9
  10 <hr>
  11 <pre id="console"></pre>
  12 <iframe style="width:0; height:0"></iframe>
  13
  14 <script>
  15 if (window.testRunner)
  16     testRunner.dumpAsText();
  17
  18 var topEval = eval;
  19 var frameEval = frames[0].eval;
  20
  21 function log(s)
  22 {
  23     document.getElementById("console").appendChild(document.createTextNode(s + "\n"));
  24 }
  25
  26 function shouldBe(aDescription, a, b)
  27 {
  28     if (a === b) {
  29         log("PASS: " + aDescription + " should be " + b + " and is.");
  30     } else {
  31         log("FAIL: " + aDescription + " should be " + b + " but instead is " + a + ".");
  32     }
  33 }
  34
  35 function testGetX()
  36 {
  37     window.x = 0;
  38     frames[0].x = 1;
  39     var x = 2;
  40
  41     shouldBe('window.eval("x")', window.eval("x"), 0);
  42     shouldBe('frames[0].eval("x")', frames[0].eval("x"), 1);
  43
  44     window.eval = frameEval;
  45     shouldBe('window.eval("x")', (function() { try { return window.eval("x") } catch(e) { return e.name; } })(), 1);
  46     window.eval = topEval;
  47
  48     frames[0].eval = topEval;
  49     shouldBe('frames[0].eval("x")', (function() { try { frames[0].eval("x") } catch(e) { return e.name; } })(), undefined);
  50     frames[0].eval = frameEval;
  51 }
  52
  53 function testGetXX()
  54 {
  55     var xx = 0;
  56
  57     shouldBe('window.eval("xx")', (function() { try { return window.eval("xx") } catch(e) { return e.name; } })(), "ReferenceError");
  58     shouldBe('frames[0].eval("xx")', (function() { try { return frames[0].eval("xx") } catch(e) { return e.name; } })(), "ReferenceError");
  59
  60     window.eval = frameEval;
  61     shouldBe('window.eval("xx")', (function() { try { return window.eval("xx") } catch(e) { return e.name; } })(), "ReferenceError");
  62     window.eval = topEval;
  63
  64     frames[0].eval = topEval;
  65     shouldBe('frames[0].eval("xx")', (function() { try { return frames[0].eval("xx") } catch(e) { return e.name; } })(), "ReferenceError");
  66     frames[0].eval = frameEval;
  67 }
  68
  69 function testVarY()
  70 {
  71     shouldBe('window.eval("var y; \"y\" in top")', window.eval("var y; \"y\" in top"), true);
  72     delete window.y;
  73     delete frames[0].y;
  74
  75     shouldBe('frames[0].eval("var y; \"y\" in top.frames[0]")', frames[0].eval("var y; \"y\" in top.frames[0]"), true);
  76     delete window.y;
  77     delete frames[0].y;
  78
  79     window.eval = frameEval;
  80     shouldBe('window.eval("var y; \"y\" in top.frames[0]")', (function() { try { window.eval("var y; \"y\" in top.frames[0]") } catch(e) { return e.name; } })(), undefined);
  81     delete window.y;
  82     delete frames[0].y;
  83     window.eval = topEval;
  84
  85     frames[0].eval = topEval;
  86     shouldBe('frames[0].eval("var y; \"y\" in top")', (function() { try { frames[0].eval("var y; \"y\" in top") } catch(e) { return e.name; } })(), undefined);
  87     delete window.y;
  88     delete frames[0].y;
  89     frames[0].eval = frameEval;
  90 }
  91
  92 function testSetZ()
  93 {
  94     window.z = 0;
  95     frames[0].z = 0;
  96     var z = 0;
  97
  98     shouldBe('window.eval("z = 1; top.z")', window.eval("z = 1; top.z"), 1);
  99     shouldBe('frames[0].eval("z = 2; top.frames[0].z")', frames[0].eval("z = 2; top.frames[0].z"), 2);
 100
 101     window.eval = frameEval;
 102     shouldBe('window.eval("z = 3; top.frames[0].z")', (function() { try { window.eval("z = 3; top.frames[0].z") } catch(e) { return e.name; } })(), undefined);
 103     window.eval = topEval;
 104
 105     frames[0].eval = topEval;
 106     shouldBe('frames[0].eval("z = 4; top.z")', (function() { try { frames[0].eval("z = 4; top.z") } catch(e) { return e.name; } })(), undefined);
 107     frames[0].eval = frameEval;
 108 }
 109
 110 function testThis()
 111 {
 112     shouldBe('window.eval("this")', window.eval.call("wrong", "this"), window);
 113     shouldBe('frames[0].eval("this")', frames[0].eval.call("wrong", "this"), frames[0]);
 114
 115     window.eval = frameEval;
 116     shouldBe('window.eval("this")', (function() { try { window.eval.call("wrong", "this"), frames[0] } catch(e) { return e.name; } })(), undefined);
 117     window.eval = topEval;
 118
 119     frames[0].eval = topEval;
 120     shouldBe('frames[0].eval("this")', (function() { try { frames[0].eval.call("wrong", "this"), window } catch(e) { return e.name; } })(), undefined);
 121     frames[0].eval = frameEval;
 122 }
 123
 124 log("\n----- Scope Chain Head for Getters: -----\n");
 125 testGetX();
 126 log("\n----- Scope Chain for Getters: -----\n");
 127 testGetXX();
 128 log("\n----- Variable Object: -----\n");
 129 testVarY();
 130 log("\n----- Scope Chain for Setters: -----\n");
 131 testSetZ();
 132 log("\n----- This Object: -----\n");
 133 testThis.call({});
 134 </script>