intellij-sdk-code-samples/code_samples/simple_language_plugin/src/com/simpleplugin/SimpleCommenter.java

package com.simpleplugin;

import com.intellij.lang.Commenter;
import org.jetbrains.annotations.Nullable;

public class SimpleCommenter implements Commenter {
  @Nullable
  @Override
  public String getLineCommentPrefix() {
    return "#";
  }

  @Nullable
  @Override
  public String getBlockCommentPrefix() {
    return "";
  }

  @Nullable
  @Override
  public String getBlockCommentSuffix() {
    return null;
  }

  @Nullable
  @Override
  public String getCommentedBlockCommentPrefix() {
    return null;
  }

  @Nullable
  @Override
  public String getCommentedBlockCommentSuffix() {
    return null;
  }
}