com.google.errorprone.refaster.UClassDecl Maven / Gradle / Ivy
/*
* Copyright 2013 The Error Prone 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.errorprone.refaster;
import com.google.auto.value.AutoValue;
import com.google.common.base.Function;
import com.google.common.collect.ContiguousSet;
import com.google.common.collect.DiscreteDomain;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Range;
import com.google.errorprone.util.ASTHelpers;
import com.sun.source.tree.ClassTree;
import com.sun.source.tree.MethodTree;
import com.sun.source.tree.ModifiersTree;
import com.sun.source.tree.Tree;
import com.sun.source.tree.TreeVisitor;
import com.sun.source.tree.TypeParameterTree;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.JCClassDecl;
import com.sun.tools.javac.util.List;
import javax.lang.model.element.Name;
/**
* {@code UTree} representation of a {@code ClassTree} for anonymous inner class matching.
*
* @author [email protected] (Louis Wasserman)
*/
@AutoValue
abstract class UClassDecl extends USimpleStatement implements ClassTree {
public static UClassDecl create(UMethodDecl... members) {
return create(ImmutableList.copyOf(members));
}
public static UClassDecl create(Iterable members) {
return new AutoValue_UClassDecl(ImmutableList.copyOf(members));
}
@AutoValue
abstract static class UnifierWithRemainingMembers {
static UnifierWithRemainingMembers create(
Unifier unifier, Iterable remainingMembers) {
return new AutoValue_UClassDecl_UnifierWithRemainingMembers(
unifier, ImmutableList.copyOf(remainingMembers));
}
abstract Unifier unifier();
abstract ImmutableList remainingMembers();
static Function withRemaining(
Iterable remainingMembers) {
return (Unifier unifier) -> create(unifier, remainingMembers);
}
}
private static Function> match(
Tree tree) {
return (UnifierWithRemainingMembers state) -> {
ImmutableList currentMembers = state.remainingMembers();
Choice methodChoice =
Choice.from(
ContiguousSet.create(
Range.closedOpen(0, currentMembers.size()), DiscreteDomain.integers()));
return methodChoice.thenChoose(
(Integer i) -> {
ImmutableList remainingMembers =
ImmutableList.builder()
.addAll(currentMembers.subList(0, i))
.addAll(currentMembers.subList(i + 1, currentMembers.size()))
.build();
UMethodDecl chosenMethod = currentMembers.get(i);
Unifier unifier = state.unifier().fork();
/*
* If multiple methods use the same parameter name, preserve the last parameter
* name from the target code. For example, given a @BeforeTemplate with
*
* int get(int index) {...}
* int set(int index, int value) {...}
*
* and target code with the lines
*
* int get(int i) {...}
* int set(int j) {...}
*
* then use "j" in place of index in the @AfterTemplates.
*/
for (UVariableDecl param : chosenMethod.getParameters()) {
unifier.clearBinding(param.key());
}
return chosenMethod
.unify(tree, unifier)
.transform(UnifierWithRemainingMembers.withRemaining(remainingMembers));
});
};
}
@Override
public Choice visitClass(ClassTree node, Unifier unifier) {
Choice path =
Choice.of(UnifierWithRemainingMembers.create(unifier, getMembers()));
for (Tree targetMember : node.getMembers()) {
if (targetMember instanceof MethodTree
&& ASTHelpers.isGeneratedConstructor((MethodTree) targetMember)) {
// skip synthetic constructors
continue;
}
path = path.thenChoose(match(targetMember));
}
return path.condition(s -> s.remainingMembers().isEmpty())
.transform(UnifierWithRemainingMembers::unifier);
}
@Override
public JCClassDecl inline(Inliner inliner) throws CouldNotResolveImportException {
return inliner
.maker()
.AnonymousClassDef(
inliner.maker().Modifiers(0L),
List.convert(JCTree.class, inliner.inlineList(getMembers())));
}
@Override
public R accept(TreeVisitor visitor, D data) {
return visitor.visitClass(this, data);
}
@Override
public Kind getKind() {
return Kind.CLASS;
}
@Override
public UTree getExtendsClause() {
return null;
}
@Override
public ImmutableList> getImplementsClause() {
return ImmutableList.of();
}
@Override
public abstract ImmutableList getMembers();
@Override
public ModifiersTree getModifiers() {
return null;
}
@Override
public Name getSimpleName() {
return null;
}
@Override
public ImmutableList getTypeParameters() {
return ImmutableList.of();
}
}