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DefinitionsRemoverTest.java
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DefinitionsRemoverTest.java
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/*
* 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.javascript.jscomp.DefinitionsRemover.Definition;
import com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback;
import com.google.javascript.rhino.Node;
import java.util.ArrayList;
import java.util.List;
/**
* Test for {@link DefinitionsRemover}. Basically test for the simple removal cases. More
* complicated cases are tested by the clients of {@link DefinitionsRemover} such as {@link
* PureFunctionIdentifierTest} and {@link RemoveUnusedCodeTest}.
*
*/
public final class DefinitionsRemoverTest extends CompilerTestCase {
public void testRemoveFunction() {
setAcceptedLanguage(CompilerOptions.LanguageMode.ECMASCRIPT_2015);
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 (){})");
test("var c = function() {}", "(function() {})");
}
public void testRemoveClass() {
test("class C {}", "");
test("f(class C {})", "f(class {})");
test("var c = class C {}", "(class{})");
}
public void testRemoveClassMemberFunctions() {
test("f(class {func(){}})", "f(class{})");
test("f(class {static func(){}})", "f(class{})");
testSame("f(class {[Symbol.iterator](){}})");
}
public void testRemoveObjectMemberFunctions() {
test("use({func(){}});", "use({});");
test("use({x: 1, func(){}});", "use({});");
test("use({func(){}, x: 1});", "use({});");
}
@Override
protected CompilerPass getProcessor(final Compiler compiler) {
// Create a pass that removes all the definitions.
return (Node externs, Node root) -> {
DefinitionsGatherer definitionsGatherer = new DefinitionsGatherer();
NodeTraversal.traverseEs6(compiler, root, definitionsGatherer);
for (Definition def : definitionsGatherer.definitions) {
def.remove(compiler);
}
};
}
/**
* Gather all possible definition objects.
*/
private static class DefinitionsGatherer extends AbstractPostOrderCallback {
final List<Definition> definitions = new ArrayList<>();
@Override
public void visit(NodeTraversal t, Node n, Node parent) {
Definition def = DefinitionsRemover.getDefinition(n, false);
if (def != null) {
definitions.add(def);
}
}
}
}