platform/core-impl/src/com/intellij/util/codeInsight/CommentUtilCore.java

/*
 * Copyright 2000-2012 JetBrains s.r.o.
 *
 * 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.intellij.util.codeInsight;

import com.intellij.lang.*;
import com.intellij.psi.PsiComment;
import com.intellij.psi.PsiElement;
import com.intellij.psi.tree.IElementType;
import org.jetbrains.annotations.Nullable;

public class CommentUtilCore {
  public static boolean isComment(@Nullable final PsiElement element) {
    return element != null && isComment(element.getNode());
  }

  public static boolean isComment(@Nullable final ASTNode node) {
    if (node == null) return false;
    final IElementType type = node.getElementType();
    final ParserDefinition parserDefinition = LanguageParserDefinitions.INSTANCE.forLanguage(type.getLanguage());
    return parserDefinition != null && parserDefinition.getCommentTokens().contains(type);
  }

  public static boolean isCommentTextElement(final PsiElement element) {
    final Commenter commenter = LanguageCommenters.INSTANCE.forLanguage(element.getLanguage());
    if (commenter instanceof CodeDocumentationAwareCommenterEx) {
      final CodeDocumentationAwareCommenterEx commenterEx = (CodeDocumentationAwareCommenterEx)commenter;
      if (commenterEx.isDocumentationCommentText(element)) return true;
      if (element instanceof PsiComment && commenterEx.isDocumentationComment((PsiComment)element)) return false;
    }

    return isComment(element);
  }
}