/*
 * Copyright 2000-2017 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.codeInsight.template.emmet.filters;

import com.intellij.codeInsight.template.emmet.tokens.TemplateToken;
import com.intellij.lang.xml.XMLLanguage;
import com.intellij.psi.PsiElement;
import com.intellij.psi.xml.XmlTag;
import com.intellij.xml.XmlBundle;
import com.intellij.xml.util.HtmlUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import static com.google.common.base.Strings.isNullOrEmpty;

/**
 * @author Eugene.Kudelevsky
 */
public class CommentZenCodingFilter extends ZenCodingFilter {
  private static String buildCommentString(@Nullable String classAttr, @Nullable String idAttr) {
    StringBuilder builder = new StringBuilder();
    if (!isNullOrEmpty(idAttr)) {
      builder.append('#').append(idAttr);
    }
    if (!isNullOrEmpty(classAttr)) {
      builder.append('.').append(classAttr);
    }
    return builder.toString();
  }

  @NotNull
  @Override
  public String filterText(@NotNull String text, @NotNull TemplateToken token) {
    XmlTag tag = token.getXmlTag();
    if (tag != null) {
      String classAttr = tag.getAttributeValue(getClassAttributeName());
      String idAttr = tag.getAttributeValue(HtmlUtil.ID_ATTRIBUTE_NAME);
      if (!isNullOrEmpty(classAttr) || !isNullOrEmpty(idAttr)) {
        String commentString = buildCommentString(classAttr, idAttr);
        return String.format(getCommentFormat(), text, commentString);
      }
    }
    return text;
  }

  @NotNull
  protected String getCommentFormat() {
    return "%s\n<!-- /%s -->";
  }

  @NotNull
  public String getClassAttributeName() {
    return HtmlUtil.CLASS_ATTRIBUTE_NAME;
  }

  @NotNull
  @Override
  public String getSuffix() {
    return "c";
  }

  @Override
  public boolean isMyContext(@NotNull PsiElement context) {
    return context.getParent().getLanguage() instanceof XMLLanguage;
  }

  @NotNull
  @Override
  public String getDisplayName() {
    return XmlBundle.message("emmet.filter.comment.tags");
  }
}

@@ -2396,22 +2396,35 @@
 ) %7B%0A    
-return
+PsiElement parent =
  context
@@ -2435,16 +2435,53 @@
 Parent()
+;%0A    return parent != null && parent
 .getLang

fix npe EA-234204