/*
* Copyright 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.dev.js;
/**
* Tests the JsDuplicateCaseFolder optimizer.
*/
public class JsDuplicateCaseFolderTest extends OptimizerTestBase {
public void test1() throws Exception {
String input = "function a(x){switch(x){case 0:return 17;case 12:case 1:return 18;case 2:return 17;case 3:return 18;}}";
String expected = "function a(x){switch(x){case 2:case 0:return 17;case 12:case 3:case 1:return 18;}}\n";
check(expected, input);
}
public void test1b() throws Exception {
String input = "function a(x){switch(x){case 0:return 17;case 12:case 1:return 18;default:return 17;case 3:return 18;}}";
String expected = "function a(x){switch(x){default:case 0:return 17;case 12:case 3:case 1:return 18;}}\n";
check(expected, input);
}
public void test2() throws Exception {
// Don't coalesces cases 0 and 2 since 2 can be reached via fallthrough from 1
String input = "function a(x){var y;switch(x){case 0:return 17;case 1:y=18;case 2:return 17;case 3:y=18;}return y}";
String expected = "function a(x){var y;switch(x){case 0:return 17;case 1:y=18;case 2:return 17;case 3:y=18;}return y}\n";
check(expected, input);
}
public void test3() throws Exception {
// cases 1 and 3 can fall through, don't coalesce
String input = "function a(x){var y;switch(x){case 0:return 17;case 1:y=18;break;case 2:return 17;case 3:y=18;break;}return y}";
String expected = "function a(x){var y;switch(x){case 2:case 0:return 17;case 3:case 1:y=18;break;}return y}\n";
check(expected, input);
}
public void test4() throws Exception {
// cases 1 and 3 may be coalesced
String input = "function a(x,z){var y;switch(x){case 0:return 17;case 1:if (z==0){y=18;break}else{y=19;break}case 2:return 17;case 3:if(z==0){y=18;break}else{y=19;break}}return y}";
String expected = "function a(x,z){var y;switch(x){case 2:case 0:return 17;case 3:case 1:if(z==0){y=18;break}else{y=19;break}}return y}\n";
check(expected, input);
}
public void test4b() throws Exception {
// cases 1 and 3 may be coalesced
// ensure additional fallthroughs are handled correctly
String input = "function a(x,z){var y;switch(x){case 0:case 22:return 17;case 100:case 1:if (z==0){y=18;break}else{y=19;return 20}case 2:return 17;case 200:case 3:if(z==0){y=18;break}else{y=19;return 20}}return y}";
String expected = "function a(x,z){var y;switch(x){case 0:case 2:case 22:return 17;case 100:case 1:if(z==0){y=18;break}else{y=19;return 20}case 200:case 3:if(z==0){y=18;break}else{y=19;return 20}}return y}\n";
check(expected, input);
}
public void test5() throws Exception {
// cases 1 and 3 can fall through due to no else clause, don't coalesce
String input = "function a(x,z){var y;switch(x){case 0:return 17;case 1:if (z==0){y=18;break}else{y=19}case 2:return 17;case 3:if(z==0){y=18;break}else{y=19}}return y}";
String expected = "function a(x,z){var y;switch(x){case 0:return 17;case 1:if(z==0){y=18;break}else{y=19}case 2:return 17;case 3:if(z==0){y=18;break}else{y=19}}return y}\n";
check(expected, input);
}
public void test6() throws Exception {
// cases 1 and 3 can fall through due to no else clause, don't coalesce
String input = "function a(x,z){var y;switch(x){case 0:y=17;break;case 1:if(z==0){y=18;break}else{y=19}case 2:return 22;case 3:if(z==0){y=18;break}else{y=19}case 4:y=17;break;case 5:y=17;break;case 6:return 22;}return y}";
String expected = "function a(x,z){var y;switch(x){case 0:y=17;break;case 1:if(z==0){y=18;break}else{y=19}case 6:case 2:return 22;case 3:if(z==0){y=18;break}else{y=19}case 5:case 4:y=17;break;}return y}\n";
check(expected, input);
}
public void test6b() throws Exception {
// cases 1 and 3 can fall through due to no else clause, don't coalesce
String input = "function a(x,z){var y;switch(x){case 0:y=17;break;case 1:if(z==0){y=18;break}else{y=19}default:return 22;case 3:if(z==0){y=18;break}else{y=19}case 4:y=17;break;case 5:y=17;break;case 6:return 22;}return y}";
String expected = "function a(x,z){var y;switch(x){case 0:y=17;break;case 1:if(z==0){y=18;break}else{y=19}case 6:default:return 22;case 3:if(z==0){y=18;break}else{y=19}case 5:case 4:y=17;break;}return y}\n";
check(expected, input);
}
private void check(String expected, String input) throws Exception {
// Pass the expected code through the parser to normalize it
expected = super.optimize(expected, new Class[0]);
String output = optimize(input);
assertEquals(expected, output);
}
private String optimize(String js) throws Exception {
return optimize(js, JsDuplicateCaseFolder.class);
}
}