com.google.errorprone.bugpatterns.javadoc.MalformedInlineTag 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 java.util.stream.Collectors.joining;
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.tree.ClassTree;
import com.sun.source.tree.MethodTree;
import com.sun.source.tree.VariableTree;
import com.sun.source.util.DocTreePath;
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;
/**
* Finds malformed inline tags where {@literal @}{tag is used instead of {{@literal @}tag.
*
* @author [email protected] (Aaron Hurst)
*/
@BugPattern(
name = "MalformedInlineTag",
summary = "This Javadoc tag is malformed. The correct syntax is {@tag and not @{tag.",
severity = WARNING,
documentSuppression = false)
public final class MalformedInlineTag extends BugChecker
implements ClassTreeMatcher, MethodTreeMatcher, VariableTreeMatcher {
private static final Pattern MALFORMED_PATTERN =
Pattern.compile(
"@\\{("
+ JavadocTag.ALL_INLINE_TAGS.stream().map(JavadocTag::name).collect(joining("|"))
+ ")");
@Override
public Description matchClass(ClassTree classTree, VisitorState state) {
return handle(state);
}
@Override
public Description matchMethod(MethodTree methodTree, VisitorState state) {
return handle(state);
}
@Override
public Description matchVariable(VariableTree variableTree, VisitorState state) {
return handle(state);
}
/**
* Main action on each class/method/variable Javadoc comment.
*
* Match all instances of the malformed regex pattern in the full comment text. There isn't any
* benefit to iterating over the parsed tree, as the syntax errors can appear anywhere and won't
* be parsed.
*/
private Description handle(VisitorState state) {
DocTreePath path = Utils.getDocTreePath(state);
if (path == null) {
return Description.NO_MATCH;
}
Comment comment = ((DCDocComment) path.getDocComment()).comment;
Matcher matcher = MALFORMED_PATTERN.matcher(comment.getText());
while (matcher.find()) {
String tag = matcher.group(1);
int startPos = comment.getSourcePos(matcher.start());
int endPos = comment.getSourcePos(matcher.end());
state.reportMatch(
buildDescription(getDiagnosticPosition(startPos, path.getTreePath().getLeaf()))
.setMessage(String.format("The correct syntax to open this inline tag is {@%s.", tag))
.addFix(SuggestedFix.replace(startPos, endPos, "{@" + tag))
.build());
}
// Intentionally returning NO_MATCH here, because multiple findings are reported above
return Description.NO_MATCH;
}
}