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flexmark-java extension for GFM strikethrough using ~~ (GitHub Flavored Markdown)

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package com.vladsch.flexmark.ext.gfm.strikethrough;

import com.vladsch.flexmark.ext.gfm.strikethrough.internal.StrikethroughJiraRenderer;
import com.vladsch.flexmark.ext.gfm.strikethrough.internal.StrikethroughNodeRenderer;
import com.vladsch.flexmark.ext.gfm.strikethrough.internal.StrikethroughSubscriptDelimiterProcessor;
import com.vladsch.flexmark.ext.gfm.strikethrough.internal.StrikethroughYouTrackRenderer;
import com.vladsch.flexmark.html.HtmlRenderer;
import com.vladsch.flexmark.parser.Parser;
import com.vladsch.flexmark.util.data.MutableDataHolder;
import com.vladsch.flexmark.util.data.NullableDataKey;
import org.jetbrains.annotations.NotNull;

/**
 * Extension for GFM strikethrough using ~~ (GitHub Flavored Markdown).
 *
 * Create it with {@link #create()} and then configure it on the builders
 *
 * The parsed strikethrough text regions are turned into {@link Strikethrough} nodes.
 */
public class StrikethroughSubscriptExtension
    implements Parser.ParserExtension, HtmlRenderer.HtmlRendererExtension {
  public static final NullableDataKey STRIKETHROUGH_STYLE_HTML_OPEN =
      new NullableDataKey<>("STRIKETHROUGH_STYLE_HTML_OPEN");
  public static final NullableDataKey STRIKETHROUGH_STYLE_HTML_CLOSE =
      new NullableDataKey<>("STRIKETHROUGH_STYLE_HTML_CLOSE");
  public static final NullableDataKey SUBSCRIPT_STYLE_HTML_OPEN =
      new NullableDataKey<>("SUBSCRIPT_STYLE_HTML_OPEN");
  public static final NullableDataKey SUBSCRIPT_STYLE_HTML_CLOSE =
      new NullableDataKey<>("SUBSCRIPT_STYLE_HTML_CLOSE");

  private StrikethroughSubscriptExtension() {}

  public static StrikethroughSubscriptExtension create() {
    return new StrikethroughSubscriptExtension();
  }

  @Override
  public void rendererOptions(@NotNull MutableDataHolder options) {}

  @Override
  public void parserOptions(MutableDataHolder options) {}

  @Override
  public void extend(Parser.Builder parserBuilder) {
    parserBuilder.customDelimiterProcessor(new StrikethroughSubscriptDelimiterProcessor());
  }

  @Override
  public void extend(
      @NotNull HtmlRenderer.Builder htmlRendererBuilder, @NotNull String rendererType) {
    if (htmlRendererBuilder.isRendererType("HTML")) {
      htmlRendererBuilder.nodeRendererFactory(new StrikethroughNodeRenderer.Factory());
    } else if (htmlRendererBuilder.isRendererType("YOUTRACK")) {
      htmlRendererBuilder.nodeRendererFactory(new StrikethroughYouTrackRenderer.Factory());
    } else if (htmlRendererBuilder.isRendererType("JIRA")) {
      htmlRendererBuilder.nodeRendererFactory(new StrikethroughJiraRenderer.Factory());
    }
  }
}