third_party/WebKit/LayoutTests/fast/js/var-declarations-shadowing.html

   1 <p>
   2 This page tests var declarations that attempt to shadow interesting global properties in
   3 interesting ways. <a href="http://bugs.webkit.org/show_bug.cgi?id=16644">Bug 16644</a>.
   4 </p>
   5
   6 <p>
   7 If the test passes, you'll see a series of PASS messages below.
   8 </p>
   9
  10 <pre id="console"></pre>
  11
  12 <script>
  13 if (window.testRunner)
  14     testRunner.dumpAsText();
  15
  16 function log(s)
  17 {
  18     document.getElementById("console").appendChild(document.createTextNode(s + "\n"));
  19 }
  20
  21 function shouldBe(a, aDescription, b)
  22 {
  23     if (a == b) {
  24         log("PASS: " + aDescription + " should be " + b + " and is.");
  25     } else {
  26         log("FAIL: " + aDescription + " should be " + b + " but instead is " + a + ".");
  27     }
  28 }
  29
  30 var marker = { };
  31
  32 var Node; // shadow existing property of the global object
  33 eval("var Element;"); // ditto, but using eval
  34
  35 var toString; // shadow existing property of the global object's prototype
  36 eval("var valueOf;"); // ditto, but using eval
  37
  38 shouldBe(Node == undefined, "Node == undefined", false);
  39 shouldBe(eval('Node == undefined'), "eval('Node == undefined')", false);
  40
  41 shouldBe(Element == undefined, "Element == undefined", false);
  42 shouldBe(eval('Element == undefined'), "eval('Element == undefined')", false);
  43
  44 shouldBe(toString == undefined, "toString == undefined", false);
  45 shouldBe(eval('toString == undefined'), "eval('toString == undefined')", false);
  46
  47 shouldBe(valueOf == undefined, "valueOf == undefined", false);
  48 shouldBe(eval('valueOf == undefined'), "eval('valueOf == undefined')", false);
  49
  50 log("-----");
  51
  52 // Repeat the tests above, this time explicitly overwriting existing properties
  53
  54 var HTMLElement = marker;
  55 eval("var HTMLLinkElement = marker;");
  56
  57 var moveBy = marker;
  58 eval("var find = marker;");
  59
  60 shouldBe(HTMLElement == marker, "HTMLElement == marker", true);
  61 shouldBe(eval('HTMLElement == marker'), "eval('HTMLElement == marker')", true);
  62
  63 shouldBe(HTMLLinkElement == marker, "HTMLLinkElement == marker", true);
  64 shouldBe(eval('HTMLLinkElement == marker'), "eval('HTMLLinkElement == marker')", true);
  65
  66 shouldBe(moveBy == marker, "moveBy == marker", true);
  67 shouldBe(eval('moveBy == marker'), "eval('moveBy == marker')", true);
  68
  69 shouldBe(find == marker, "find == marker", true);
  70 shouldBe(eval('find == marker'), "eval('find == marker')", true);
  71
  72 log("-----");
  73
  74 // Various variable names that are, or at one point were, unsettable in WebKit.
  75
  76 try {
  77     eval("var locationbar = marker");
  78 } catch(e) { }
  79 shouldBe(locationbar == marker, "locationbar == marker", true);
  80 shouldBe(eval('locationbar == marker'), "eval('locationbar == marker')", true);
  81
  82 try {
  83     eval("var menubar = marker");
  84 } catch(e) { }
  85 shouldBe(menubar == marker, "menubar == marker", true);
  86 shouldBe(eval('menubar == marker'), "eval('menubar == marker')", true);
  87
  88 try {
  89     eval("var personalbar = marker");
  90 } catch(e) { }
  91 shouldBe(personalbar == marker, "personalbar == marker", true);
  92 shouldBe(eval('personalbar == marker'), "eval('personalbar == marker')", true);
  93
  94 try {
  95     eval("var scrollbars = marker");
  96 } catch(e) { }
  97 shouldBe(scrollbars == marker, "scrollbars == marker", true);
  98 shouldBe(eval('scrollbars == marker'), "eval('scrollbars == marker')", true);
  99
 100 try {
 101     eval("var statusbar = marker");
 102 } catch(e) { }
 103 shouldBe(statusbar == marker, "statusbar == marker", true);
 104 shouldBe(eval('statusbar == marker'), "eval('statusbar == marker')", true);
 105
 106 try {
 107     eval("var toolbar = marker");
 108 } catch(e) { }
 109 shouldBe(toolbar == marker, "toolbar == marker", true);
 110 shouldBe(eval('toolbar == marker'), "eval('toolbar == marker')", true);
 111
 112 try {
 113     eval("var offscreenBuffering = marker");
 114 } catch(e) { }
 115 shouldBe(offscreenBuffering == marker, "offscreenBuffering == marker", true);
 116 shouldBe(eval('offscreenBuffering == marker'), "eval('offscreenBuffering == marker')", true);
 117
 118 try {
 119     eval("var outerHeight = marker");
 120 } catch(e) { }
 121 shouldBe(outerHeight == marker, "outerHeight == marker", true);
 122 shouldBe(eval('outerHeight == marker'), "eval('outerHeight == marker')", true);
 123
 124 try {
 125     eval("var outerWidth = marker");
 126 } catch(e) { }
 127 shouldBe(outerWidth == marker, "outerWidth == marker", true);
 128 shouldBe(eval('outerWidth == marker'), "eval('outerWidth == marker')", true);
 129
 130 try {
 131     eval("var innerHeight = marker");
 132 } catch(e) { }
 133 shouldBe(innerHeight == marker, "innerHeight == marker", true);
 134 shouldBe(eval('innerHeight == marker'), "eval('innerHeight == marker')", true);
 135
 136 try {
 137     eval("var innerWidth = marker");
 138 } catch(e) { }
 139 shouldBe(innerWidth == marker, "innerWidth == marker", true);
 140 shouldBe(eval('innerWidth == marker'), "eval('innerWidth == marker')", true);
 141
 142 try {
 143     eval("var screenX = marker");
 144 } catch(e) { }
 145 shouldBe(screenX == marker, "screenX == marker", true);
 146 shouldBe(eval('screenX == marker'), "eval('screenX == marker')", true);
 147
 148 try {
 149     eval("var screenY = marker");
 150 } catch(e) { }
 151 shouldBe(screenY == marker, "screenY == marker", true);
 152 shouldBe(eval('screenY == marker'), "eval('screenY == marker')", true);
 153
 154 try {
 155     eval("var screenLeft = marker");
 156 } catch(e) { }
 157 shouldBe(screenLeft == marker, "screenLeft == marker", true);
 158 shouldBe(eval('screenLeft == marker'), "eval('screenLeft == marker')", true);
 159
 160 try {
 161     eval("var screenTop = marker");
 162 } catch(e) { }
 163 shouldBe(screenTop == marker, "screenTop == marker", true);
 164 shouldBe(eval('screenTop == marker'), "eval('screenTop == marker')", true);
 165
 166 try {
 167     eval("var scrollX = marker");
 168 } catch(e) { }
 169 shouldBe(scrollX == marker, "scrollX == marker", true);
 170 shouldBe(eval('scrollX == marker'), "eval('scrollX == marker')", true);
 171
 172 try {
 173     eval("var scrollY = marker");
 174 } catch(e) { }
 175 shouldBe(scrollY == marker, "scrollY == marker", true);
 176 shouldBe(eval('scrollY == marker'), "eval('scrollY == marker')", true);
 177
 178 try {
 179     eval("var length = marker");
 180 } catch(e) { }
 181 shouldBe(length == marker, "length == marker", true);
 182 shouldBe(eval('length == marker'), "eval('length == marker')", true);
 183
 184 try {
 185     eval("var self = marker");
 186 } catch(e) { }
 187 shouldBe(self == marker, "self == marker", true);
 188 shouldBe(eval('self == marker'), "eval('self == marker')", true);
 189
 190 try {
 191     eval("var frames = marker");
 192 } catch(e) { }
 193 shouldBe(frames == marker, "frames == marker", true);
 194 shouldBe(eval('frames == marker'), "eval('frames == marker')", true);
 195
 196 try {
 197     eval("var opener = marker");
 198 } catch(e) { }
 199 shouldBe(opener == marker, "opener == marker", true);
 200 shouldBe(eval('opener == marker'), "eval('opener == marker')", true);
 201
 202 try {
 203     eval("var parent = marker");
 204 } catch(e) { }
 205 shouldBe(parent == marker, "parent == marker", true);
 206 shouldBe(eval('parent == marker'), "eval('parent == marker')", true);
 207
 208 try {
 209     eval("var devicePixelRatio = marker");
 210 } catch(e) { }
 211 shouldBe(devicePixelRatio == marker, "devicePixelRatio == marker", true);
 212 shouldBe(eval('devicePixelRatio == marker'), "eval('devicePixelRatio == marker')", true);
 213
 214 try {
 215     eval("var devicePixelRatio = marker");
 216 } catch(e) { }
 217 shouldBe(devicePixelRatio == marker, "devicePixelRatio == marker", true);
 218 shouldBe(eval('devicePixelRatio == marker'), "eval('devicePixelRatio == marker')", true);
 219
 220 try {
 221     eval("var navigator = marker");
 222 } catch(e) { }
 223 shouldBe(navigator == marker, "navigator == marker", false);
 224 shouldBe(eval('navigator == marker'), "eval('navigator == marker')", false);
 225
 226 try {
 227     eval("var clientInformation = marker");
 228 } catch(e) { }
 229 shouldBe(clientInformation == marker, "clientInformation == marker", true);
 230 shouldBe(eval('clientInformation == marker'), "eval('clientInformation == marker')", true);
 231
 232 try {
 233     eval("var status = marker");
 234 } catch(e) { }
 235 shouldBe(status == marker, "status == marker", true);
 236 shouldBe(eval('status == marker'), "eval('status == marker')", true);
 237
 238 try {
 239     eval("var defaultStatus = marker");
 240 } catch(e) { }
 241 shouldBe(defaultStatus == marker, "defaultStatus == marker", true);
 242 shouldBe(eval('defaultStatus == marker'), "eval('defaultStatus == marker')", true);
 243
 244 try {
 245     eval("var defaultstatus = marker");
 246 } catch(e) { }
 247 shouldBe(defaultstatus == marker, "defaultstatus == marker", true);
 248 shouldBe(eval('defaultstatus == marker'), "eval('defaultstatus == marker')", true);
 249
 250 try {
 251     eval("var screen = marker");
 252 } catch(e) { }
 253 shouldBe(screen == marker, "screen == marker", true);
 254 shouldBe(eval('screen == marker'), "eval('screen == marker')", true);
 255
 256 try {
 257     eval("var history = marker");
 258 } catch(e) { }
 259 shouldBe(history == marker, "history == marker", false);
 260 shouldBe(eval('history == marker'), "eval('history == marker')", false);
 261
 262 log("-----");
 263
 264 try {
 265     eval("var frameElement = marker");
 266 } catch(e) { }
 267 shouldBe(frameElement == marker, "frameElement == marker", false);
 268 shouldBe(eval('frameElement == marker'), "eval('frameElement == marker')", false);
 269
 270 try {
 271     eval("var pageXOffset = marker");
 272 } catch(e) { }
 273 shouldBe(pageXOffset == marker, "pageXOffset == marker", true);
 274 shouldBe(eval('pageXOffset == marker'), "eval('pageXOffset == marker')", true);
 275
 276 try {
 277     eval("var pageYOffset = marker");
 278 } catch(e) { }
 279 shouldBe(pageYOffset == marker, "pageYOffset == marker", true);
 280 shouldBe(eval('pageYOffset == marker'), "eval('pageYOffset == marker')", true);
 281
 282 try {
 283     eval("var closed = marker");
 284 } catch(e) { }
 285 shouldBe(closed == marker, "closed == marker", false);
 286 shouldBe(eval('closed == marker'), "eval('closed == marker')", false);
 287
 288 try {
 289     eval("var window = marker");
 290 } catch(e) { }
 291 shouldBe(window == marker, "window == marker", false);
 292 shouldBe(eval('window == marker'), "eval('window == marker')", false);
 293
 294 try {
 295     eval("var document = marker");
 296 } catch(e) { }
 297 shouldBe(document == marker, "document == marker", false);
 298 shouldBe(eval('document == marker'), "eval('document == marker')", false);
 299
 300 try {
 301     eval("var crypto = marker");
 302 } catch(e) { }
 303 shouldBe(crypto == marker, "crypto == marker", false);
 304 shouldBe(eval('crypto == marker'), "eval('crypto == marker')", false);
 305
 306 try {
 307     eval("var top = marker");
 308 } catch(e) { }
 309 shouldBe(top == marker, "top == marker", false);
 310 shouldBe(eval('top == marker'), "eval('top == marker')", false);
 311
 312 </script>