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42 * SUMMARY: Functions are scoped statically, not dynamically
44 * See ECMA Section 10.1.4 Scope Chain and Identifier Resolution
45 * (This section defines the scope chain of an execution context)
47 * See ECMA Section 12.10 The with Statement
49 * See ECMA Section 13 Function Definition
50 * (This section defines the scope chain of a function object as that
51 * of the running execution context when the function was declared)
53 //-----------------------------------------------------------------------------
55 var BUGNUMBER = '(none)';
56 var summary = 'Testing that functions are scoped statically, not dynamically';
57 var self = this; // capture a reference to the global object
59 var statusitems = [ ];
61 var actualvalues = [ ];
63 var expectedvalues = [ ];
66 * In this section the expected value is 1, not 2.
68 * Why? f captures its scope chain from when it's declared, and imposes that chain
69 * when it's executed. In other words, f's scope chain is from when it was compiled.
70 * Since f is a top-level function, this is the global object only. Hence 'a' resolves to 1.
72 status = 'Section A of test';
88 * In this section the expected value is 2, not 1. That is because here
89 * f's associated scope chain now includes 'obj' before the global object.
91 status = 'Section B of test';
107 * Like Section B , except that we call f outside the with block.
108 * By the principles explained above, we still expect 2 -
110 status = 'Section C of test';
126 * Like Section C, but with one more level of indirection -
128 status = 'Section D of test';
130 var obj = {a:2, obj:{a:3}};
147 * Like Section C, but here we actually delete obj before calling f.
148 * We still expect 2 -
150 status = 'Section E of test';
167 * Like Section E. Here we redefine obj and call f under with (obj) -
168 * We still expect 2 -
170 status = 'Section F of test';
186 expect = 2; // NOT 3 !!!
191 * Explicitly verify that f exists at global level, even though
192 * it was defined under the with(obj) block -
194 status = 'Section G of test';
204 actual = String([obj.hasOwnProperty('f'), self.hasOwnProperty('f')]);
205 expect = String([false, true]);
210 * Explicitly verify that f exists at global level, even though
211 * it was defined under the with(obj) block -
213 status = 'Section H of test';
223 actual = String(['f' in obj, 'f' in self]);
224 expect = String([false, true]);
229 //-------------------------------------------------------------------------------------------------
231 //-------------------------------------------------------------------------------------------------
236 statusitems[UBound] = status;
237 actualvalues[UBound] = actual;
238 expectedvalues[UBound] = expect;
244 function resetTestVars()
255 printBugNumber(BUGNUMBER);
256 printStatus (summary);
258 for (var i = 0; i < UBound; i++)
260 reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);