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flexmark-java misc utility classes

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package com.vladsch.flexmark.util.misc;

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class TemplateUtil {
  public static final Resolver NULL_RESOLVER = groups -> null;

  public static class MappedResolver implements Resolver {
    protected final Map resolved;

    public MappedResolver(Map map) {
      resolved = map;
    }

    public MappedResolver() {
      this(new HashMap<>());
    }

    public MappedResolver set(String name, String value) {
      resolved.put(name, value);
      return this;
    }

    public Map getMMap() {
      return resolved;
    }

    @Override
    public String resolve(String[] groups) {
      return groups.length > 2 ? null : resolved.get(groups[1]);
    }
  }

  public interface Resolver {
    String resolve(String[] groups);
  }

  public static String resolveRefs(CharSequence text, Pattern pattern, Resolver resolver) {
    if (text == null) {
      return "";
    }

    Matcher matcher = pattern.matcher(text);
    if (matcher.find()) {
      StringBuffer sb = new StringBuffer();

      do {
        String[] groups = new String[matcher.groupCount() + 1];
        for (int i = 0; i < groups.length; i++) {
          groups[i] = matcher.group(i);
        }

        String resolved = resolver.resolve(groups);

        matcher.appendReplacement(
            sb, resolved == null ? "" : resolved.replace("\\", "\\\\").replace("$", "\\$"));
      } while (matcher.find());

      matcher.appendTail(sb);
      return sb.toString();
    }
    return text.toString();
  }
}