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/*
* Copyright 2014 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 static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import com.google.auto.value.AutoValue;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Ascii;
import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableClassToInstanceMap;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;
import com.google.errorprone.CodeTransformer;
import com.google.errorprone.DescriptionListener;
import com.google.errorprone.SubContext;
import com.sun.source.util.TreePath;
import com.sun.tools.javac.code.Symbol.PackageSymbol;
import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
import com.sun.tools.javac.util.Context;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.util.Collection;
import java.util.List;
import java.util.Set;
import javax.tools.JavaFileManager;
/**
* A representation of an entire Refaster rule, corresponding to a class with @BeforeTemplates
* and @AfterTemplates.
*
* @author [email protected] (Louis Wasserman)
* @param The type of a match.
* @param The type of the template used to find matches and generate replacements.
*/
@AutoValue
public abstract class RefasterRule>
implements CodeTransformer, Serializable {
public static RefasterRule create(
String qualifiedTemplateClass,
Collection> beforeTemplates,
Collection> afterTemplates) {
return create(
qualifiedTemplateClass,
ImmutableList.of(),
beforeTemplates,
afterTemplates,
ImmutableClassToInstanceMap.of());
}
public static RefasterRule create(
String qualifiedTemplateClass,
Iterable typeVariables,
Collection> beforeTemplates,
Collection> afterTemplates,
ImmutableClassToInstanceMap annotations) {
checkState(
!beforeTemplates.isEmpty(),
"No @BeforeTemplate was found in the specified class: %s",
qualifiedTemplateClass);
Class templateType = beforeTemplates.iterator().next().getClass();
for (Template beforeTemplate : beforeTemplates) {
checkState(
beforeTemplate.getClass().equals(templateType),
"Expected all templates to be of type %s but found template of type %s in %s",
templateType,
beforeTemplate.getClass(),
qualifiedTemplateClass);
}
for (Template afterTemplate : afterTemplates) {
Set missingArguments =
Sets.difference(
afterTemplate.expressionArgumentTypes().keySet(),
beforeTemplates.stream()
.>map(t -> t.expressionArgumentTypes().keySet())
.reduce(Sets::intersection)
.get());
checkArgument(
missingArguments.isEmpty(),
"@AfterTemplate of %s defines arguments that are not present in all @BeforeTemplate"
+ " methods: %s",
qualifiedTemplateClass,
missingArguments);
checkState(
afterTemplate.getClass().equals(templateType),
"Expected all templates to be of type %s but found template of type %s in %s",
templateType,
afterTemplate.getClass(),
qualifiedTemplateClass);
}
@SuppressWarnings({"unchecked", "rawtypes"})
RefasterRule result =
new AutoValue_RefasterRule(
qualifiedTemplateClass,
ImmutableList.copyOf(typeVariables),
ImmutableList.copyOf(beforeTemplates),
ImmutableList.copyOf(afterTemplates),
annotations);
return result;
}
RefasterRule() {}
abstract String qualifiedTemplateClass();
abstract ImmutableList typeVariables();
abstract ImmutableList beforeTemplates();
abstract ImmutableList afterTemplates();
@Override
public abstract ImmutableClassToInstanceMap annotations();
@Override
public void apply(TreePath path, Context context, DescriptionListener listener) {
RefasterScanner.create(this, listener)
.scan(
path.getLeaf(), prepareContext(context, (JCCompilationUnit) path.getCompilationUnit()));
}
boolean rejectMatchesWithComments() {
return true; // TODO(lowasser): worth making configurable?
}
static final Context.Key> RULE_TYPE_VARS = new Context.Key<>();
private Context prepareContext(Context baseContext, JCCompilationUnit compilationUnit) {
Context context = new SubContext(baseContext);
if (context.get(JavaFileManager.class) == null) {
JavacFileManager.preRegister(context);
}
context.put(JCCompilationUnit.class, compilationUnit);
context.put(PackageSymbol.class, compilationUnit.packge);
context.put(RULE_TYPE_VARS, typeVariables());
return context;
}
@VisibleForTesting
static String fromSecondLevel(String qualifiedTemplateClass) {
List path = Splitter.on('.').splitToList(qualifiedTemplateClass);
for (int topLevel = 0; topLevel < path.size() - 1; topLevel++) {
if (Ascii.isUpperCase(path.get(topLevel).charAt(0))) {
return Joiner.on('_').join(path.subList(topLevel + 1, path.size()));
}
}
return Iterables.getLast(path);
}
String simpleTemplateName() {
return fromSecondLevel(qualifiedTemplateClass());
}
@Override
public final String toString() {
return simpleTemplateName();
}
}
