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/*
* Copyright 2011 The Closure Compiler Authors.
*
* 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.javascript.jscomp;
/**
* Unit tests for {@link StatementFusion}.
*
*/
public class StatementFusionTest extends CompilerTestCase {
@Override
public void setUp() throws Exception {
super.setUp();
enableLineNumberCheck(true);
}
@Override
public CompilerPass getProcessor(final Compiler compiler) {
PeepholeOptimizationsPass peepholePass =
new PeepholeOptimizationsPass(compiler, new StatementFusion());
return peepholePass;
}
public void testNothingToDo() {
fuseSame("");
fuseSame("a");
fuseSame("a()");
fuseSame("if(a()){}");
}
public void testFoldBlockWithStatements() {
fuse("a;b;c", "a,b,c");
fuse("a();b();c();", "a(),b(),c()");
fuse("a(),b();c(),d()", "a(),b(),c(),d()");
fuse("a();b(),c(),d()", "a(),b(),c(),d()");
fuse("a(),b(),c();d()", "a(),b(),c(),d()");
}
public void testFoldBlockIntoIf() {
fuse("a;b;c;if(x){}", "if(a,b,c,x){}");
fuse("a;b;c;if(x,y){}else{}", "if(a,b,c,x,y){}else{}");
fuse("a;b;c;if(x,y){}", "if(a,b,c,x,y){}");
fuse("a;b;c;if(x,y,z){}", "if(a,b,c,x,y,z){}");
// Can't fuse if there are statements after the IF.
fuseSame("a();if(a()){}a()");
}
public void testFoldBlockReturn() {
fuse("a;b;c;return x", "return a,b,c,x");
fuse("a;b;c;return x+y", "return a,b,c,x+y");
// DeadAssignmentElimination would have cleaned it up anyways.
fuseSame("a;b;c;return x;a;b;c");
}
public void testFoldBlockThrow() {
fuse("a;b;c;throw x", "throw a,b,c,x");
fuse("a;b;c;throw x+y", "throw a,b,c,x+y");
fuseSame("a;b;c;throw x;a;b;c");
}
public void testFoldSwitch() {
fuse("a;b;c;switch(x){}", "switch(a,b,c,x){}");
}
public void testFuseIntoForIn() {
fuse("a;b;c;for(x in y){}", "for(x in a,b,c,y){}");
fuseSame("a();for(var x = b() in y){}");
}
public void testNoFuseIntoWhile() {
fuseSame("a;b;c;while(x){}");
}
public void testNoFuseIntoDo() {
fuseSame("a;b;c;do{}while(x)");
}
public void testNoGlobalSchopeChanges() {
testSame("a,b,c");
}
public void testNoFunctionBlockChanges() {
testSame("function foo() { a,b,c }");
}
private void fuse(String before, String after) {
test("function F(){if(CONDITION){" + before + "}}",
"function F(){if(CONDITION){" + after + "}}");
}
private void fuseSame(String code) {
fuse(code, code);
}
}
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