/*
* Copyright 2009 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;
import com.google.common.collect.Lists;
import com.google.javascript.jscomp.DefinitionsRemover.Definition;
import com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback;
import com.google.javascript.rhino.Node;
import java.util.List;
/**
* Test for {@link DefinitionsRemover}. Basically test for the simple removal
* cases. More complicated cases will be tested by the clients of
* {@link DefinitionsRemover}.
*
*/
public class DefinitionsRemoverTest extends CompilerTestCase {
public void testRemoveFunction() {
testSame("{(function (){bar()})}");
test("{function a(){bar()}}", "{}");
test("foo(); function a(){} bar()", "foo(); bar();");
test("foo(); function a(){} function b(){} bar()", "foo(); bar();");
}
public void testRemoveAssignment() {
test("x = 0;", "0");
test("{x = 0}", "{0}");
test("x = 0; y = 0;", "0; 0;");
test("for (x = 0;x;x) {};", "for(0;x;x) {};");
}
public void testRemoveVarAssignment() {
test("var x = 0;", "0");
test("{var x = 0}", "{0}");
test("var x = 0; var y = 0;", "0;0");
test("var x = 0; var y = 0;", "0;0");
}
public void testRemoveLiteral() {
test("foo({ 'one' : 1 })", "foo({ })");
test("foo({ 'one' : 1 , 'two' : 2 })", "foo({ })");
}
public void testRemoveFunctionExpressionName() {
test("foo(function f(){})", "foo(function (){})");
}
@Override
protected CompilerPass getProcessor(final Compiler compiler) {
// Create a pass that removes all the definitions.
return new CompilerPass() {
@Override
public void process(Node externs, Node root) {
DefinitionsGatherer g = new DefinitionsGatherer();
(new NodeTraversal(compiler, g)).traverse(root);
for (Definition def : g.definitions) {
def.remove();
compiler.reportCodeChange();
}
}
};
}
/**
* Gather all possible definition objects.
*/
private static class DefinitionsGatherer extends AbstractPostOrderCallback {
final List<Definition> definitions = Lists.newArrayList();
@Override
public void visit(NodeTraversal t, Node n, Node parent) {
Definition def = DefinitionsRemover.getDefinition(n, false);
if (def != null) {
definitions.add(def);
}
}
}
}