Initial add.

js/tests/ecma_3/Function/scope-002.js

@@ -0,0 +1,224 @@
+/*
+* The contents of this file are subject to the Netscape Public
+* License Version 1.1 (the "License"); you may not use this file
+* except in compliance with the License. You may obtain a copy of
+* the License at http://www.mozilla.org/NPL/
+*
+* Software distributed under the License is distributed on an "AS
+* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+* implied. See the License for the specific language governing
+* rights and limitations under the License.
+*
+* The Original Code is mozilla.org code.
+*
+* The Initial Developer of the Original Code is Netscape
+* Communications Corporation.  Portions created by Netscape are
+* Copyright (C) 1998 Netscape Communications Corporation. All
+* Rights Reserved.
+*
+* Contributor(s): pschwartau@netscape.com, rogerl@netscape.com
+* Date: 28 May 2001
+*
+* SUMMARY:  Functions are scoped statically, not dynamically
+*
+* See ECMA Section 10.1.4 Scope Chain and Identifier Resolution
+* (This section defines the scope chain of an execution context)
+*
+* See ECMA Section 12.10 The with Statement
+*
+* See ECMA Section 13 Function Definition
+* (This section defines the scope chain of a function object as that
+*  of the running execution context when the function was declared)
+*
+* Like scope-001.js, but using assignment var f = function expression
+* instead of a function declaration: function f() {} etc.
+*/
+//-------------------------------------------------------------------------------------------------
+var UBound = 0;
+var bug = '(none)';
+var summary = 'Testing that functions are scoped statically, not dynamically';
+var self = this;  // capture a reference to the global object
+var status = '';
+var statusitems = [ ];
+var actual = '';
+var actualvalues = [ ];
+var expect= '';
+var expectedvalues = [ ];
+
+
+/*
+ * In this section the expected value is 1, not 2.
+ *
+ * Why? f captures its scope chain from when it's declared, and imposes that chain
+ * when it's executed. In other words, f's scope chain is from when it was compiled.
+ * Since f is a top-level function, this is the global object only. Hence 'a' resolves to 1.
+ */
+status = 'Section A of test';
+var a = 1;
+var f = function () {return a;};
+var obj = {a:2};
+with (obj)
+{
+  actual = f();
+}
+expect = 1;
+addThis();
+
+
+/*
+ * In this section the expected value is 2, not 1. That is because here
+ * f's associated scope chain now includes 'obj' before the global object.
+ */
+status = 'Section B of test';
+var a = 1;
+var obj = {a:2};
+with (obj)
+{
+  var f = function () {return a;};
+  actual = f();
+}
+expect = 2;
+addThis();
+
+
+/*
+ * Like Section B , except that we call f outside the with block.
+ * By the principles explained above, we still expect 2 -
+ */
+status = 'Section C of test';
+var a = 1;
+var obj = {a:2};
+with (obj)
+{
+  var f = function () {return a;};
+}
+actual = f();
+expect = 2;
+addThis();
+
+
+/*
+ * Like Section C, but with one more level of indirection -
+ */
+status = 'Section D of test';
+var a = 1;
+var obj = {a:2, obj:{a:3}};
+with (obj)
+{
+  with (obj)
+  {
+    var f = function () {return a;};
+  }
+}
+actual = f();
+expect = 3;
+addThis();
+
+
+/*
+ * Like Section C, but here we actually delete obj before calling f.
+ * We still expect 2 -
+ */
+status = 'Section E of test';
+var a = 1;
+var obj = {a:2};
+with (obj)
+{
+  var f = function () {return a;};
+}
+delete obj;
+actual = f();
+expect = 2;
+addThis();
+
+
+/*
+ * Like Section E. Here we redefine obj and call f under with (obj) -
+ * We still expect 2 -
+ */
+status = 'Section F of test';
+var a = 1;
+var obj = {a:2};
+with (obj)
+{
+  var f = function () {return a;};
+}
+delete obj;
+var obj = {a:3};
+with (obj)
+{
+  actual = f();
+}
+expect = 2;  // NOT 3 !!!
+addThis();
+
+
+/*
+ * Explicitly verify that f exists at global level, even though
+ * it was defined under the with(obj) block -
+ */
+status = 'Section G of test';
+var a = 1;
+var obj = {a:2};
+with (obj)
+{
+  var f = function () {return a;};
+}
+actual = String([obj.hasOwnProperty('f'), self.hasOwnProperty('f')]);
+expect = String([false, true]);
+addThis();
+
+
+/*
+ * Explicitly verify that f exists at global level, even though
+ * it was defined under the with(obj) block -
+ */
+status = 'Section H of test';
+var a = 1;
+var obj = {a:2};
+with (obj)
+{
+  var f = function () {return a;};
+}
+actual = String(['f' in obj, 'f' in self]);
+expect = String([false, true]);
+addThis();
+
+
+
+//-------------------------------------------------------------------------------------------------
+test();
+//-------------------------------------------------------------------------------------------------
+
+
+function addThis()
+{
+  statusitems[UBound] = status;
+  actualvalues[UBound] = actual;
+  expectedvalues[UBound] = expect;
+  UBound++;
+  resetTestVars();
+}
+
+
+function resetTestVars()
+{
+  delete a;
+  delete obj;
+  delete f;
+}
+
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber (bug);
+  printStatus (summary);
+ 
+  for (var i = 0; i < UBound; i++)
+  {
+    reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
+  }
+
+  exitFunc ('test');
+}