1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/tests/ecma_3/Function/scope-002.js Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,211 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/*
1.10 + * Date: 28 May 2001
1.11 + *
1.12 + * SUMMARY: Functions are scoped statically, not dynamically
1.13 + *
1.14 + * See ECMA Section 10.1.4 Scope Chain and Identifier Resolution
1.15 + * (This section defines the scope chain of an execution context)
1.16 + *
1.17 + * See ECMA Section 12.10 The with Statement
1.18 + *
1.19 + * See ECMA Section 13 Function Definition
1.20 + * (This section defines the scope chain of a function object as that
1.21 + * of the running execution context when the function was declared)
1.22 + *
1.23 + * Like scope-001.js, but using assignment var f = function expression
1.24 + * instead of a function declaration: function f() {} etc.
1.25 + */
1.26 +//-----------------------------------------------------------------------------
1.27 +var UBound = 0;
1.28 +var BUGNUMBER = '(none)';
1.29 +var summary = 'Testing that functions are scoped statically, not dynamically';
1.30 +var self = this; // capture a reference to the global object
1.31 +var status = '';
1.32 +var statusitems = [ ];
1.33 +var actual = '';
1.34 +var actualvalues = [ ];
1.35 +var expect= '';
1.36 +var expectedvalues = [ ];
1.37 +
1.38 +
1.39 +/*
1.40 + * In this section the expected value is 1, not 2.
1.41 + *
1.42 + * Why? f captures its scope chain from when it's declared, and imposes that chain
1.43 + * when it's executed. In other words, f's scope chain is from when it was compiled.
1.44 + * Since f is a top-level function, this is the global object only. Hence 'a' resolves to 1.
1.45 + */
1.46 +status = 'Section A of test';
1.47 +var a = 1;
1.48 +var f = function () {return a;};
1.49 +var obj = {a:2};
1.50 +with (obj)
1.51 +{
1.52 + actual = f();
1.53 +}
1.54 +expect = 1;
1.55 +addThis();
1.56 +
1.57 +
1.58 +/*
1.59 + * In this section the expected value is 2, not 1. That is because here
1.60 + * f's associated scope chain now includes 'obj' before the global object.
1.61 + */
1.62 +status = 'Section B of test';
1.63 +var a = 1;
1.64 +var obj = {a:2};
1.65 +with (obj)
1.66 +{
1.67 + var f = function () {return a;};
1.68 + actual = f();
1.69 +}
1.70 +expect = 2;
1.71 +addThis();
1.72 +
1.73 +
1.74 +/*
1.75 + * Like Section B , except that we call f outside the with block.
1.76 + * By the principles explained above, we still expect 2 -
1.77 + */
1.78 +status = 'Section C of test';
1.79 +var a = 1;
1.80 +var obj = {a:2};
1.81 +with (obj)
1.82 +{
1.83 + var f = function () {return a;};
1.84 +}
1.85 +actual = f();
1.86 +expect = 2;
1.87 +addThis();
1.88 +
1.89 +
1.90 +/*
1.91 + * Like Section C, but with one more level of indirection -
1.92 + */
1.93 +status = 'Section D of test';
1.94 +var a = 1;
1.95 +var obj = {a:2, obj:{a:3}};
1.96 +with (obj)
1.97 +{
1.98 + with (obj)
1.99 + {
1.100 + var f = function () {return a;};
1.101 + }
1.102 +}
1.103 +actual = f();
1.104 +expect = 3;
1.105 +addThis();
1.106 +
1.107 +
1.108 +/*
1.109 + * Like Section C, but here we actually delete obj before calling f.
1.110 + * We still expect 2 -
1.111 + */
1.112 +status = 'Section E of test';
1.113 +var a = 1;
1.114 +var obj = {a:2};
1.115 +with (obj)
1.116 +{
1.117 + var f = function () {return a;};
1.118 +}
1.119 +delete obj;
1.120 +actual = f();
1.121 +expect = 2;
1.122 +addThis();
1.123 +
1.124 +
1.125 +/*
1.126 + * Like Section E. Here we redefine obj and call f under with (obj) -
1.127 + * We still expect 2 -
1.128 + */
1.129 +status = 'Section F of test';
1.130 +var a = 1;
1.131 +var obj = {a:2};
1.132 +with (obj)
1.133 +{
1.134 + var f = function () {return a;};
1.135 +}
1.136 +delete obj;
1.137 +var obj = {a:3};
1.138 +with (obj)
1.139 +{
1.140 + actual = f();
1.141 +}
1.142 +expect = 2; // NOT 3 !!!
1.143 +addThis();
1.144 +
1.145 +
1.146 +/*
1.147 + * Explicitly verify that f exists at global level, even though
1.148 + * it was defined under the with(obj) block -
1.149 + */
1.150 +status = 'Section G of test';
1.151 +var a = 1;
1.152 +var obj = {a:2};
1.153 +with (obj)
1.154 +{
1.155 + var f = function () {return a;};
1.156 +}
1.157 +actual = String([obj.hasOwnProperty('f'), self.hasOwnProperty('f')]);
1.158 +expect = String([false, true]);
1.159 +addThis();
1.160 +
1.161 +
1.162 +/*
1.163 + * Explicitly verify that f exists at global level, even though
1.164 + * it was defined under the with(obj) block -
1.165 + */
1.166 +status = 'Section H of test';
1.167 +var a = 1;
1.168 +var obj = {a:2};
1.169 +with (obj)
1.170 +{
1.171 + var f = function () {return a;};
1.172 +}
1.173 +actual = String(['f' in obj, 'f' in self]);
1.174 +expect = String([false, true]);
1.175 +addThis();
1.176 +
1.177 +
1.178 +
1.179 +//-------------------------------------------------------------------------------------------------
1.180 +test();
1.181 +//-------------------------------------------------------------------------------------------------
1.182 +
1.183 +
1.184 +function addThis()
1.185 +{
1.186 + statusitems[UBound] = status;
1.187 + actualvalues[UBound] = actual;
1.188 + expectedvalues[UBound] = expect;
1.189 + UBound++;
1.190 + resetTestVars();
1.191 +}
1.192 +
1.193 +
1.194 +function resetTestVars()
1.195 +{
1.196 + delete a;
1.197 + delete obj;
1.198 + delete f;
1.199 +}
1.200 +
1.201 +
1.202 +function test()
1.203 +{
1.204 + enterFunc ('test');
1.205 + printBugNumber(BUGNUMBER);
1.206 + printStatus (summary);
1.207 +
1.208 + for (var i = 0; i < UBound; i++)
1.209 + {
1.210 + reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
1.211 + }
1.212 +
1.213 + exitFunc ('test');
1.214 +}
