com.google.errorprone.bugpatterns.javadoc.UnrecognisedJavadocTag Maven / Gradle / Ivy
/*
* Copyright 2021 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.SeverityLevel.WARNING;
import static com.google.errorprone.bugpatterns.javadoc.Utils.getDiagnosticPosition;
import static com.google.errorprone.bugpatterns.javadoc.Utils.getStartPosition;
import static com.google.errorprone.matchers.Description.NO_MATCH;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
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.matchers.Description;
import com.sun.source.doctree.DocTree.Kind;
import com.sun.source.doctree.LinkTree;
import com.sun.source.doctree.LiteralTree;
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 com.sun.tools.javac.parser.Tokens.Comment;
import com.sun.tools.javac.tree.DCTree.DCDocComment;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.annotation.Nullable;
/** Flags tags which haven't been recognised by the Javadoc parser. */
@BugPattern(
name = "UnrecognisedJavadocTag",
summary =
"This Javadoc tag wasn't recognised by the parser. Is it malformed somehow, perhaps with"
+ " mismatched braces?",
severity = WARNING,
documentSuppression = false)
public final class UnrecognisedJavadocTag extends BugChecker
implements ClassTreeMatcher, MethodTreeMatcher, VariableTreeMatcher {
private static final Pattern TAG = Pattern.compile("\\{@(code|link)");
@Override
public Description matchClass(ClassTree classTree, VisitorState state) {
return handle(Utils.getDocTreePath(state), state);
}
@Override
public Description matchMethod(MethodTree methodTree, VisitorState state) {
return handle(Utils.getDocTreePath(state), state);
}
@Override
public Description matchVariable(VariableTree variableTree, VisitorState state) {
return handle(Utils.getDocTreePath(state), state);
}
private Description handle(@Nullable DocTreePath path, VisitorState state) {
if (path == null) {
return NO_MATCH;
}
ImmutableSet recognisedTags = findRecognisedTags(path, state);
ImmutableSet tagStrings = findTags(((DCDocComment) path.getDocComment()).comment);
for (int pos : Sets.difference(tagStrings, recognisedTags)) {
state.reportMatch(
buildDescription(getDiagnosticPosition(pos, path.getTreePath().getLeaf())).build());
}
return NO_MATCH;
}
private ImmutableSet findRecognisedTags(DocTreePath path, VisitorState state) {
ImmutableSet.Builder tags = ImmutableSet.builder();
new DocTreePathScanner() {
@Override
public Void visitLink(LinkTree linkTree, Void unused) {
tags.add(getStartPosition(linkTree, state));
return super.visitLink(linkTree, null);
}
@Override
public Void visitLiteral(LiteralTree literalTree, Void unused) {
if (literalTree.getKind().equals(Kind.CODE)) {
tags.add(getStartPosition(literalTree, state));
}
return super.visitLiteral(literalTree, null);
}
}.scan(path, null);
return tags.build();
}
private static ImmutableSet findTags(Comment comment) {
Matcher matcher = TAG.matcher(comment.getText());
ImmutableSet.Builder tags = ImmutableSet.builder();
while (matcher.find()) {
tags.add(comment.getSourcePos(matcher.start()));
}
return tags.build();
}
}