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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 * Like scope-001.js, but using assignment var f = function expression
54 * instead of a function declaration: function f() {} etc.
56 //-----------------------------------------------------------------------------
57 var gTestfile = 'scope-002.js';
59 var BUGNUMBER = '(none)';
60 var summary = 'Testing that functions are scoped statically, not dynamically';
61 var self = this; // capture a reference to the global object
63 var statusitems = [ ];
65 var actualvalues = [ ];
67 var expectedvalues = [ ];
71 * In this section the expected value is 1, not 2.
73 * Why? f captures its scope chain from when it's declared, and imposes that chain
74 * when it's executed. In other words, f's scope chain is from when it was compiled.
75 * Since f is a top-level function, this is the global object only. Hence 'a' resolves to 1.
77 status = 'Section A of test';
79 var f = function () {return a;};
90 * In this section the expected value is 2, not 1. That is because here
91 * f's associated scope chain now includes 'obj' before the global object.
93 status = 'Section B of test';
98 var f = function () {return a;};
106 * Like Section B , except that we call f outside the with block.
107 * By the principles explained above, we still expect 2 -
109 status = 'Section C of test';
114 var f = function () {return a;};
122 * Like Section C, but with one more level of indirection -
124 status = 'Section D of test';
126 var obj = {a:2, obj:{a:3}};
131 var f = function () {return a;};
140 * Like Section C, but here we actually delete obj before calling f.
141 * We still expect 2 -
143 status = 'Section E of test';
148 var f = function () {return a;};
157 * Like Section E. Here we redefine obj and call f under with (obj) -
158 * We still expect 2 -
160 status = 'Section F of test';
165 var f = function () {return a;};
173 expect = 2; // NOT 3 !!!
178 * Explicitly verify that f exists at global level, even though
179 * it was defined under the with(obj) block -
181 status = 'Section G of test';
186 var f = function () {return a;};
188 actual = String([obj.hasOwnProperty('f'), self.hasOwnProperty('f')]);
189 expect = String([false, true]);
194 * Explicitly verify that f exists at global level, even though
195 * it was defined under the with(obj) block -
197 status = 'Section H of test';
202 var f = function () {return a;};
204 actual = String(['f' in obj, 'f' in self]);
205 expect = String([false, true]);
210 //-------------------------------------------------------------------------------------------------
212 //-------------------------------------------------------------------------------------------------
217 statusitems[UBound] = status;
218 actualvalues[UBound] = actual;
219 expectedvalues[UBound] = expect;
225 function resetTestVars()
236 printBugNumber(BUGNUMBER);
237 printStatus (summary);
239 for (var i = 0; i < UBound; i++)
241 reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);