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Side by Side Diff: tests/language/src/LabelTest.dart

Issue 10248007: test rename overhaul: step 8 - language tests (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Created 8 years, 8 months ago
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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file.
4 // Dart test program to test check that we can parse labels.
5
6
7 class Helper {
8
9 static int ticks;
10
11 // Helper function to prevent endless loops in case labels or
12 // break/continue is broken.
13 static doAgain() {
14 ++ticks;
15 if (ticks > 300) {
16 // obfuscating man's assert(false)
17 Expect.equals(true, false);
18 }
19 return true;
20 }
21
22 static test1() {
23 var i = 1;
24 while (doAgain()) {
25 if (i > 0) break;
26 return 0;
27 }
28 return 111;
29 }
30
31 static test2() {
32 // Make sure we break out to default label.
33 var i = 1;
34 L: while (doAgain()) { // unused label
35 if (i > 0) break;
36 return 0;
37 }
38 return 111;
39 }
40
41 static test3() {
42 // Make sure we break out of outer loop.
43 var i = 1;
44 L: while (doAgain()) {
45 while (doAgain()) {
46 if (i > 0) break L;
47 return 0;
48 }
49 return 1;
50 }
51 return 111;
52 }
53
54 static test4() {
55 // Make sure we break out of inner loop.
56 var i = 100;
57 L: while (doAgain()) { // unused label
58 while (doAgain()) {
59 if (i > 0) break;
60 return 0;
61 }
62 return 111;
63 }
64 return 1;
65 }
66
67 static test5() {
68 // Make sure we jump to loop condition.
69 var i = 10;
70 while (i > 0) {
71 i--;
72 if (true) continue; // without the if the following return is dead code.
73 return 0;
74 }
75 return 111;
76 }
77
78 static test6() {
79 // Make sure we jump to loop condition.
80 L: for (int i = 10; i > 0; i--) { // unreferenced label, should warn
81 if (true) continue; // without the if the following return is dead code.
82 return 0;
83 }
84 // Make sure this L does not conflict with previous L.
85 var k = 20;
86 L: while (doAgain()) {
87 L0: while (doAgain()) break L; // unreferenced label L0, should warn
88 return 1;
89 }
90 return 111;
91 }
92
93 static test7() {
94 // Just weird stuff.
95 var i = 10;
96 L: do {
97 L: while (doAgain()) {
98 if (true) break L; // without the if the following line is dead code.
99 continue L;
100 }
101 i = 0;
102 continue L;
103 } while (i == 10 && doAgain());
104 return 111;
105 }
106
107 static test8() {
108 L: while (false) {
109 var L = 33; // OK, shouldn't collide with label.
110 if (true) break L;
111 }
112 return 111;
113 }
114
115 static test9() {
116 var i = 111;
117 L1: if (i == 0) { // unreferenced label, should warn
118 return 0;
119 }
120
121 L2: while (i == 0) { // unreferenced label, should warn
122 return 0;
123 }
124
125 L3: // useless label, should warn
126 return i;
127 }
128
129 // Labels should be allowed on block/if/for/switch/while/do stmts.
130 static test10() {
131 int i = 111;
132 // block
133 while (doAgain()) {
134 L: {
135 while (doAgain()) {
136 break L;
137 }
138 i--;
139 }
140 break;
141 }
142 Expect.equals(111, i);
143
144 while(doAgain()) {
145 L: if (doAgain()) {
146 while(doAgain()) {
147 break L;
148 }
149 i--;
150 }
151 break;
152 }
153 Expect.equals(111, i);
154
155 while(doAgain()) {
156 L: for (;doAgain();) {
157 while (doAgain()) {
158 break L;
159 }
160 i--;
161 }
162 break;
163 }
164 Expect.equals(111, i);
165
166 L: for (i in [111]) {
167 while(doAgain()) {
168 break L;
169 }
170 i--;
171 break;
172 }
173 Expect.equals(111, i);
174
175 L: for (var j in [111]) {
176 while(doAgain()) {
177 break L;
178 }
179 i--;
180 break;
181 }
182 Expect.equals(111, i);
183
184 while(doAgain()) {
185 L: switch (i) {
186 case 111:
187 while(doAgain()) {
188 break L;
189 }
190 default:
191 i--;
192 }
193 break;
194 }
195 Expect.equals(111, i);
196
197 while(doAgain()) {
198 L: do {
199 while(doAgain()) {
200 break L;
201 }
202 i--;
203 } while (doAgain());
204 break;
205 }
206 Expect.equals(111, i);
207
208 while(doAgain()) {
209 L: try {
210 while(doAgain()) {
211 break L;
212 }
213 i--;
214 } finally {
215 }
216 break;
217 }
218 Expect.equals(111, i);
219
220 return i;
221 }
222
223 static test11() {
224 // Kind of odd, but is valid and shouldn't be flagged as useless either.
225 L: break L;
226 return 111;
227 }
228
229 static test12() {
230 int i = 111;
231
232 // label the inner block on compound stmts
233 if (true) L: {
234 while (doAgain()) {
235 break L;
236 }
237 i--;
238 }
239 Expect.equals(111, i);
240
241 // loop will execute each time, but won't execute code below the break
242 var forCount = 0;
243 for (forCount = 0 ; forCount < 2 ; forCount++) L: {
244 while(doAgain()) {
245 break L;
246 }
247 i--;
248 break;
249 }
250 Expect.equals(111, i);
251 Expect.equals(forCount, 2);
252
253 for (i in [111]) L: {
254 while(doAgain()) {
255 break L;
256 }
257 i--;
258 break;
259 }
260 Expect.equals(111, i);
261
262 for (var j in [111]) L: {
263 while(doAgain()) {
264 break L;
265 }
266 i--;
267 break;
268 }
269 Expect.equals(111, i);
270
271 if (false) {
272 } else L: {
273 while (doAgain()) {
274 break L;
275 }
276 i--;
277 }
278 Expect.equals(111, i);
279
280 int whileCount = 0;
281 while (whileCount < 2) L: {
282 whileCount++;
283 while(doAgain()) {
284 break L;
285 }
286 i--;
287 break;
288 }
289 Expect.equals(111, i);
290 Expect.equals(2, whileCount);
291
292 return i;
293 }
294 }
295
296 class LabelTest {
297 static testMain() {
298 Helper.ticks = 0;
299 Expect.equals(111, Helper.test1());
300 Expect.equals(111, Helper.test2());
301 Expect.equals(111, Helper.test3());
302 Expect.equals(111, Helper.test4());
303 Expect.equals(111, Helper.test5());
304 Expect.equals(111, Helper.test6());
305 Expect.equals(111, Helper.test7());
306 Expect.equals(111, Helper.test8());
307 Expect.equals(111, Helper.test9());
308 Expect.equals(111, Helper.test10());
309 Expect.equals(111, Helper.test11());
310 Expect.equals(111, Helper.test12());
311 }
312 }
313
314 main() {
315 LabelTest.testMain();
316 }
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