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Diffstat (limited to 'js/src/tests/ecma_3/Function/scope-002.js')
-rw-r--r-- | js/src/tests/ecma_3/Function/scope-002.js | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/js/src/tests/ecma_3/Function/scope-002.js b/js/src/tests/ecma_3/Function/scope-002.js new file mode 100644 index 000000000..20e3fa523 --- /dev/null +++ b/js/src/tests/ecma_3/Function/scope-002.js @@ -0,0 +1,211 @@ +/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* + * 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 BUGNUMBER = '(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(BUGNUMBER); + printStatus (summary); + + for (var i = 0; i < UBound; i++) + { + reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]); + } + + exitFunc ('test'); +} |