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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.internal;

import com.vladsch.flexmark.ext.gfm.strikethrough.Strikethrough;
import com.vladsch.flexmark.ext.gfm.strikethrough.Subscript;
import com.vladsch.flexmark.html.HtmlWriter;
import com.vladsch.flexmark.html.renderer.NodeRenderer;
import com.vladsch.flexmark.html.renderer.NodeRendererContext;
import com.vladsch.flexmark.html.renderer.NodeRendererFactory;
import com.vladsch.flexmark.html.renderer.NodeRenderingHandler;
import com.vladsch.flexmark.util.data.DataHolder;
import org.jetbrains.annotations.NotNull;

import java.util.HashSet;
import java.util.Set;

public class StrikethroughJiraRenderer implements NodeRenderer {

    public StrikethroughJiraRenderer(DataHolder options) {
    }

    @Override
    public Set> getNodeRenderingHandlers() {
        HashSet> set = new HashSet<>();
        set.add(new NodeRenderingHandler<>(Strikethrough.class, this::render));
        set.add(new NodeRenderingHandler<>(Subscript.class, this::render));
        return set;
    }

    private void render(Strikethrough node, NodeRendererContext context, HtmlWriter html) {
        html.raw("-");
        context.renderChildren(node);
        html.raw("-");
    }

    private void render(Subscript node, NodeRendererContext context, HtmlWriter html) {
        html.raw("~");
        context.renderChildren(node);
        html.raw("~");
    }

    public static class Factory implements NodeRendererFactory {
        @NotNull
        @Override
        public NodeRenderer apply(@NotNull DataHolder options) {
            return new StrikethroughJiraRenderer(options);
        }
    }
}