/*
* Copyright 2013 Google Inc. All Rights Reserved.
*
* 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.errorprone.matchers;
import static com.google.errorprone.matchers.Matchers.hasIdentifier;
import static org.junit.Assert.assertEquals;
import com.google.errorprone.VisitorState;
import com.google.errorprone.scanner.Scanner;
import com.sun.source.tree.IdentifierTree;
import com.sun.source.tree.LiteralTree;
import com.sun.source.tree.MethodTree;
import com.sun.source.tree.Tree;
import java.util.ArrayList;
import java.util.List;
import org.junit.After;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* @author cpovirk@google.com (Chris Povirk)
*/
@RunWith(JUnit4.class)
public class HasIdentifierTest extends CompilerBasedAbstractTest {
final List<ScannerTest> tests = new ArrayList<ScannerTest>();
@After
public void tearDown() {
for (ScannerTest test : tests) {
test.assertDone();
}
}
@Test
public void shouldMatchThis() {
writeFile("A.java",
"public class A {",
" A() { this(0); }",
" A(int foo) {}",
"}");
assertCompiles(
methodHasIdentifierMatching(true, hasIdentifier(new Matcher<IdentifierTree>() {
@Override
public boolean matches(IdentifierTree tree, VisitorState state) {
return tree.getName().contentEquals("this");
}
})));
}
@Test
public void shouldMatchLocalVar() {
writeFile("A.java",
"public class A {",
" A() {",
" int foo = 1;",
" int bar = foo;",
" }",
"}");
assertCompiles(
methodHasIdentifierMatching(true, hasIdentifier(new Matcher<IdentifierTree>() {
@Override
public boolean matches(IdentifierTree tree, VisitorState state) {
return tree.getName().contentEquals("foo");
}
})));
}
@Test
public void shouldMatchParam() {
writeFile("A.java",
"public class A {",
" A(int foo) {",
" int bar = foo;",
" }",
"}");
assertCompiles(
methodHasIdentifierMatching(true, hasIdentifier(new Matcher<IdentifierTree>() {
@Override
public boolean matches(IdentifierTree tree, VisitorState state) {
return tree.getName().contentEquals("foo");
}
})));
}
@Test
public void shouldNotMatchDeclaration() {
writeFile("A.java",
"public class A {",
" A() {",
" int foo = 1;",
" }",
"}");
assertCompiles(
methodHasIdentifierMatching(false, hasIdentifier(new Matcher<IdentifierTree>() {
@Override
public boolean matches(IdentifierTree tree, VisitorState state) {
return tree.getName().contentEquals("foo");
}
})));
}
/**
* Tests that the matcher doesn't throw an exception when applied to a tree that doesn't contain
* any identifiers or classes. Here, we apply the matcher to every LiteralTree.
*/
@Test
public void doesNotThrowWhenMatcherIsAppliedDirectlyToLiteral() {
writeFile("A.java",
"public class A {",
" A() {",
" int foo = 1;",
" }",
"}");
assertCompiles(
literalHasIdentifierMatching(false, hasIdentifier(new Matcher<IdentifierTree>() {
@Override
public boolean matches(IdentifierTree tree, VisitorState state) {
return tree.getName().contentEquals("somethingElse");
}
})));
}
private abstract static class ScannerTest extends Scanner {
abstract void assertDone();
}
private Scanner methodHasIdentifierMatching(
final boolean shouldMatch, final Matcher<Tree> toMatch) {
ScannerTest test = new ScannerTest() {
private boolean matched = false;
@Override
public Void visitMethod(MethodTree node, VisitorState visitorState) {
visitorState = visitorState.withPath(getCurrentPath());
if (toMatch.matches(node, visitorState)) {
matched = true;
}
return super.visitMethod(node, visitorState);
}
@Override
public void assertDone() {
assertEquals(matched, shouldMatch);
}
};
tests.add(test);
return test;
}
private Scanner literalHasIdentifierMatching(
final boolean shouldMatch, final Matcher<Tree> toMatch) {
ScannerTest test = new ScannerTest() {
private boolean matched = false;
@Override
public Void visitLiteral(LiteralTree node, VisitorState visitorState) {
visitorState = visitorState.withPath(getCurrentPath());
if (toMatch.matches(node, visitorState)) {
matched = true;
}
return super.visitLiteral(node, visitorState);
}
@Override
void assertDone() {
assertEquals(matched, shouldMatch);
}
};
tests.add(test);
return test;
}
}