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/*
* Copyright 2019 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.bugpatterns.javadoc;
import static com.google.errorprone.BugPattern.LinkType.CUSTOM;
import static com.google.errorprone.BugPattern.SeverityLevel.WARNING;
import static com.google.errorprone.bugpatterns.javadoc.Utils.diagnosticPosition;
import com.google.errorprone.BugPattern;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker;
import com.google.errorprone.bugpatterns.BugChecker.ClassTreeMatcher;
import com.google.errorprone.bugpatterns.BugChecker.MethodTreeMatcher;
import com.google.errorprone.bugpatterns.BugChecker.VariableTreeMatcher;
import com.google.errorprone.fixes.SuggestedFix;
import com.google.errorprone.matchers.Description;
import com.sun.source.doctree.BlockTagTree;
import com.sun.source.doctree.DeprecatedTree;
import com.sun.source.doctree.DocTree;
import com.sun.source.doctree.ParamTree;
import com.sun.source.doctree.ReturnTree;
import com.sun.source.doctree.ThrowsTree;
import com.sun.source.tree.ClassTree;
import com.sun.source.tree.MethodTree;
import com.sun.source.tree.VariableTree;
import com.sun.source.util.DocTreePath;
import com.sun.source.util.DocTreePathScanner;
import java.util.List;
/**
* Matches block tags ({@literal @}param, {@literal @}return, {@literal @}throws,
* {@literal @}deprecated) with an empty description.
*
* @author [email protected] (Andrew Ash)
*/
@BugPattern(
name = "EmptyBlockTag",
summary =
"A block tag (@param, @return, @throws, @deprecated) has an empty description. Block tags"
+ " without descriptions don't add much value for future readers of the code; consider"
+ " removing the tag entirely or adding a description.",
severity = WARNING,
linkType = CUSTOM,
link = "https://google.github.io/styleguide/javaguide.html#s7.1.3-javadoc-block-tags",
documentSuppression = false)
public final class EmptyBlockTag extends BugChecker
implements ClassTreeMatcher, MethodTreeMatcher, VariableTreeMatcher {
@Override
public Description matchClass(ClassTree classTree, VisitorState state) {
checkForEmptyBlockTags(state);
return Description.NO_MATCH;
}
@Override
public Description matchMethod(MethodTree methodTree, VisitorState state) {
checkForEmptyBlockTags(state);
return Description.NO_MATCH;
}
@Override
public Description matchVariable(VariableTree variableTree, VisitorState state) {
checkForEmptyBlockTags(state);
return Description.NO_MATCH;
}
private void checkForEmptyBlockTags(VisitorState state) {
DocTreePath path = Utils.getDocTreePath(state);
if (path != null) {
new EmptyBlockTagChecker(state).scan(path, null);
}
}
private final class EmptyBlockTagChecker extends DocTreePathScanner {
private final VisitorState state;
private EmptyBlockTagChecker(VisitorState state) {
this.state = state;
}
@Override
public Void visitParam(ParamTree paramTree, Void unused) {
reportMatchIfEmpty(paramTree, paramTree.getDescription());
return super.visitParam(paramTree, null);
}
@Override
public Void visitReturn(ReturnTree returnTree, Void unused) {
reportMatchIfEmpty(returnTree, returnTree.getDescription());
return super.visitReturn(returnTree, null);
}
@Override
public Void visitThrows(ThrowsTree throwsTree, Void unused) {
reportMatchIfEmpty(throwsTree, throwsTree.getDescription());
return super.visitThrows(throwsTree, null);
}
@Override
public Void visitDeprecated(DeprecatedTree deprecatedTree, Void unused) {
reportMatchIfEmpty(deprecatedTree, deprecatedTree.getBody());
return super.visitDeprecated(deprecatedTree, null);
}
private void reportMatchIfEmpty(
BlockTagTree blockTagTree, List description) {
if (description.isEmpty()) {
state.reportMatch(
describeMatch(
diagnosticPosition(getCurrentPath(), state),
// Don't generate a fix for deprecated; this will be annoying in conjunction with
// the check which requires a @deprecated tag for @Deprecated elements.
blockTagTree.getTagName().equals("deprecated")
? SuggestedFix.emptyFix()
: Utils.replace(blockTagTree, "", state)));
}
}
}
}