block-conflicts.js revision 592a9fc1d8ea420377a2e7efd0600e20b058be2b 
1// Copyright 2011 the V8 project authors. All rights reserved.
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3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
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11//       with the distribution.
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13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
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17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// Flags: --harmony-scoping
29
30// Test for conflicting variable bindings.
31
32// TODO(ES6): properly activate extended mode
33"use strict";
34
35function CheckException(e) {
36  var string = e.toString();
37  assertTrue(string.indexOf("has already been declared") >= 0 ||
38             string.indexOf("redeclaration") >= 0);  return 'Conflict';
39}
40
41
42function TestFunction(s,e) {
43  try {
44    return eval("(function(){" + s + ";return " + e + "})")();
45  } catch (x) {
46    return CheckException(x);
47  }
48}
49
50
51function TestBlock(s,e) {
52  try {
53    return eval("(function(){ if (true) { " + s + "; }; return " + e + "})")();
54  } catch (x) {
55    return CheckException(x);
56  }
57}
58
59function TestAll(expected,s,opt_e) {
60  var e = "";
61  var msg = s;
62  if (opt_e) { e = opt_e; msg += "; " + opt_e; }
63  assertEquals(expected, TestFunction(s,e), "function:'" + msg + "'");
64  assertEquals(expected, TestBlock(s,e), "block:'" + msg + "'");
65}
66
67
68function TestConflict(s) {
69  TestAll('Conflict', s);
70  TestAll('Conflict', 'eval("' + s + '")');
71}
72
73
74function TestNoConflict(s) {
75  TestAll('NoConflict', s, "'NoConflict'");
76  TestAll('NoConflict', 'eval("' + s + '")', "'NoConflict'");
77}
78
79var letbinds = [ "let x",
80                 "let x = 0",
81                 "let x = undefined",
82                 "function x() { }",
83                 "let x = function() {}",
84                 "let x, y",
85                 "let y, x",
86                 "const x = 0",
87                 "const x = undefined",
88                 "const x = function() {}",
89                 "const x = 2, y = 3",
90                 "const y = 4, x = 5",
91                 ];
92var varbinds = [ "var x",
93                 "var x = 0",
94                 "var x = undefined",
95                 "var x = function() {}",
96                 "var x, y",
97                 "var y, x",
98                 ];
99
100
101for (var l = 0; l < letbinds.length; ++l) {
102  // Test conflicting let/var bindings.
103  for (var v = 0; v < varbinds.length; ++v) {
104    // Same level.
105    TestConflict(letbinds[l] +'; ' + varbinds[v]);
106    TestConflict(varbinds[v] +'; ' + letbinds[l]);
107    // Different level.
108    TestConflict(letbinds[l] +'; {' + varbinds[v] + '; }');
109    TestConflict('{ ' + varbinds[v] +'; }' + letbinds[l]);
110  }
111
112  // Test conflicting let/let bindings.
113  for (var k = 0; k < letbinds.length; ++k) {
114    // Same level.
115    TestConflict(letbinds[l] +'; ' + letbinds[k]);
116    TestConflict(letbinds[k] +'; ' + letbinds[l]);
117    // Different level.
118    TestNoConflict(letbinds[l] +'; { ' + letbinds[k] + '; }');
119    TestNoConflict('{ ' + letbinds[k] +'; } ' + letbinds[l]);
120  }
121
122  // Test conflicting parameter/let bindings.
123  TestConflict('(function (x) { ' + letbinds[l] + '; })()');
124}
125
126// Test conflicting catch/var bindings.
127for (var v = 0; v < varbinds.length; ++v) {
128  TestConflict('try {} catch (x) { ' + varbinds[v] + '; }');
129}
130
131// Test conflicting parameter/var bindings.
132for (var v = 0; v < varbinds.length; ++v) {
133  TestConflict('(function (x) { ' + varbinds[v] + '; })()');
134}
135