1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/tests/ecma_3/Function/scope-001.js Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,231 @@
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 +//-----------------------------------------------------------------------------
1.24 +var UBound = 0;
1.25 +var BUGNUMBER = '(none)';
1.26 +var summary = 'Testing that functions are scoped statically, not dynamically';
1.27 +var self = this; // capture a reference to the global object
1.28 +var status = '';
1.29 +var statusitems = [ ];
1.30 +var actual = '';
1.31 +var actualvalues = [ ];
1.32 +var expect= '';
1.33 +var expectedvalues = [ ];
1.34 +
1.35 +/*
1.36 + * In this section the expected value is 1, not 2.
1.37 + *
1.38 + * Why? f captures its scope chain from when it's declared, and imposes that chain
1.39 + * when it's executed. In other words, f's scope chain is from when it was compiled.
1.40 + * Since f is a top-level function, this is the global object only. Hence 'a' resolves to 1.
1.41 + */
1.42 +status = 'Section A of test';
1.43 +var a = 1;
1.44 +function f()
1.45 +{
1.46 + return a;
1.47 +}
1.48 +var obj = {a:2};
1.49 +with (obj)
1.50 +{
1.51 + actual = f();
1.52 +}
1.53 +expect = 1;
1.54 +addThis();
1.55 +
1.56 +
1.57 +/*
1.58 + * In this section the expected value is 2, not 1. That is because here
1.59 + * f's associated scope chain now includes 'obj' before the global object.
1.60 + */
1.61 +status = 'Section B of test';
1.62 +var a = 1;
1.63 +var obj = {a:2};
1.64 +with (obj)
1.65 +{
1.66 + function f()
1.67 + {
1.68 + return a;
1.69 + }
1.70 + actual = f();
1.71 +}
1.72 +expect = 2;
1.73 +addThis();
1.74 +
1.75 +
1.76 +/*
1.77 + * Like Section B , except that we call f outside the with block.
1.78 + * By the principles explained above, we still expect 2 -
1.79 + */
1.80 +status = 'Section C of test';
1.81 +var a = 1;
1.82 +var obj = {a:2};
1.83 +with (obj)
1.84 +{
1.85 + function f()
1.86 + {
1.87 + return a;
1.88 + }
1.89 +}
1.90 +actual = f();
1.91 +expect = 2;
1.92 +addThis();
1.93 +
1.94 +
1.95 +/*
1.96 + * Like Section C, but with one more level of indirection -
1.97 + */
1.98 +status = 'Section D of test';
1.99 +var a = 1;
1.100 +var obj = {a:2, obj:{a:3}};
1.101 +with (obj)
1.102 +{
1.103 + with (obj)
1.104 + {
1.105 + function f()
1.106 + {
1.107 + return a;
1.108 + }
1.109 + }
1.110 +}
1.111 +actual = f();
1.112 +expect = 3;
1.113 +addThis();
1.114 +
1.115 +
1.116 +/*
1.117 + * Like Section C, but here we actually delete obj before calling f.
1.118 + * We still expect 2 -
1.119 + */
1.120 +status = 'Section E of test';
1.121 +var a = 1;
1.122 +var obj = {a:2};
1.123 +with (obj)
1.124 +{
1.125 + function f()
1.126 + {
1.127 + return a;
1.128 + }
1.129 +}
1.130 +delete obj;
1.131 +actual = f();
1.132 +expect = 2;
1.133 +addThis();
1.134 +
1.135 +
1.136 +/*
1.137 + * Like Section E. Here we redefine obj and call f under with (obj) -
1.138 + * We still expect 2 -
1.139 + */
1.140 +status = 'Section F of test';
1.141 +var a = 1;
1.142 +var obj = {a:2};
1.143 +with (obj)
1.144 +{
1.145 + function f()
1.146 + {
1.147 + return a;
1.148 + }
1.149 +}
1.150 +delete obj;
1.151 +var obj = {a:3};
1.152 +with (obj)
1.153 +{
1.154 + actual = f();
1.155 +}
1.156 +expect = 2; // NOT 3 !!!
1.157 +addThis();
1.158 +
1.159 +
1.160 +/*
1.161 + * Explicitly verify that f exists at global level, even though
1.162 + * it was defined under the with(obj) block -
1.163 + */
1.164 +status = 'Section G of test';
1.165 +var a = 1;
1.166 +var obj = {a:2};
1.167 +with (obj)
1.168 +{
1.169 + function f()
1.170 + {
1.171 + return a;
1.172 + }
1.173 +}
1.174 +actual = String([obj.hasOwnProperty('f'), self.hasOwnProperty('f')]);
1.175 +expect = String([false, true]);
1.176 +addThis();
1.177 +
1.178 +
1.179 +/*
1.180 + * Explicitly verify that f exists at global level, even though
1.181 + * it was defined under the with(obj) block -
1.182 + */
1.183 +status = 'Section H of test';
1.184 +var a = 1;
1.185 +var obj = {a:2};
1.186 +with (obj)
1.187 +{
1.188 + function f()
1.189 + {
1.190 + return a;
1.191 + }
1.192 +}
1.193 +actual = String(['f' in obj, 'f' in self]);
1.194 +expect = String([false, true]);
1.195 +addThis();
1.196 +
1.197 +
1.198 +
1.199 +//-------------------------------------------------------------------------------------------------
1.200 +test();
1.201 +//-------------------------------------------------------------------------------------------------
1.202 +
1.203 +
1.204 +function addThis()
1.205 +{
1.206 + statusitems[UBound] = status;
1.207 + actualvalues[UBound] = actual;
1.208 + expectedvalues[UBound] = expect;
1.209 + UBound++;
1.210 + resetTestVars();
1.211 +}
1.212 +
1.213 +
1.214 +function resetTestVars()
1.215 +{
1.216 + delete a;
1.217 + delete obj;
1.218 + delete f;
1.219 +}
1.220 +
1.221 +
1.222 +function test()
1.223 +{
1.224 + enterFunc ('test');
1.225 + printBugNumber(BUGNUMBER);
1.226 + printStatus (summary);
1.227 +
1.228 + for (var i = 0; i < UBound; i++)
1.229 + {
1.230 + reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
1.231 + }
1.232 +
1.233 + exitFunc ('test');
1.234 +}
