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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 //-----------------------------------------------------------------------------
54 var gTestfile = 'scope-001.js';
56 var BUGNUMBER = '(none)';
57 var summary = 'Testing that functions are scoped statically, not dynamically';
58 var self = this; // capture a reference to the global object
60 var statusitems = [ ];
62 var actualvalues = [ ];
64 var expectedvalues = [ ];
67 * In this section the expected value is 1, not 2.
69 * Why? f captures its scope chain from when it's declared, and imposes that chain
70 * when it's executed. In other words, f's scope chain is from when it was compiled.
71 * Since f is a top-level function, this is the global object only. Hence 'a' resolves to 1.
73 status = 'Section A of test';
89 * In this section the expected value is 2, not 1. That is because here
90 * f's associated scope chain now includes 'obj' before the global object.
92 status = 'Section B of test';
108 * Like Section B , except that we call f outside the with block.
109 * By the principles explained above, we still expect 2 -
111 status = 'Section C of test';
127 * Like Section C, but with one more level of indirection -
129 status = 'Section D of test';
131 var obj = {a:2, obj:{a:3}};
148 * Like Section C, but here we actually delete obj before calling f.
149 * We still expect 2 -
151 status = 'Section E of test';
168 * Like Section E. Here we redefine obj and call f under with (obj) -
169 * We still expect 2 -
171 status = 'Section F of test';
187 expect = 2; // NOT 3 !!!
192 * Explicitly verify that f exists at global level, even though
193 * it was defined under the with(obj) block -
195 status = 'Section G of test';
205 actual = String([obj.hasOwnProperty('f'), self.hasOwnProperty('f')]);
206 expect = String([false, true]);
211 * Explicitly verify that f exists at global level, even though
212 * it was defined under the with(obj) block -
214 status = 'Section H of test';
224 actual = String(['f' in obj, 'f' in self]);
225 expect = String([false, true]);
230 //-------------------------------------------------------------------------------------------------
232 //-------------------------------------------------------------------------------------------------
237 statusitems[UBound] = status;
238 actualvalues[UBound] = actual;
239 expectedvalues[UBound] = expect;
245 function resetTestVars()
256 printBugNumber(BUGNUMBER);
257 printStatus (summary);
259 for (var i = 0; i < UBound; i++)
261 reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);