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Markdown parser
There is a newer version: 1.2.1
/*
 * Copyright 2017-2020 FIX Protocol Ltd
 *
 * 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 io.fixprotocol.md.antlr;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.antlr.v4.gui.TestRig;

/**
 * Interactive tester for markdown grammar
 * 
 * To start a test session, enter this command line:
 *
 * 
 * java -jar md-grammar-[version]-jar-with-dependencies.jar
 * 
 *
 * The interactive tester evaluates expressions that you enter. It waits until the end of input to
 * start evaluation. To end input, type Ctrl-D on Linux or Ctrl-Z on Windows. If an expression does
 * not conform to the grammar, the tester will report "mismatched input".
 *
 * @author Don Mendelson
 *
 */
public class InteractiveTest implements Runnable {

  private static final String[] DEFAULT_ARGS = {"-gui", "-tree", "-tokens"};
  private static final String DEFAULT_GRAMMAR = "io.fixprotocol.md.antlr.Markdown";
  private static final String DEFAULT_RULE = "document";

  /**
   * Runs an interactive test of the DSL
   *
   * @param args command line arguments
   *        
   *        -f filename of file to parse - defaults to stdin
   *        -g grammar name - defaults to {@code io.fixprotocol.md.antlr}
   *        -r start rule name - defaults to {@code document}
   *        
   * @throws Exception if arguments are invalid
   */
  public static void main(String[] args) throws Exception {
    String fileName = null;
    String grammarName = DEFAULT_GRAMMAR;
    String ruleName = DEFAULT_RULE;
    for (int i = 0; i < args.length; i++) {
      switch (args[i]) {
        case "-f":
          fileName = args[++i];
          break;
        case "-g":
          grammarName = args[++i];
          break;
        case "-r":
          ruleName = args[++i];
          break;
        default:
          System.err.println("Invalid argument " + args[i]);
          usage();
      }
    }

    final List defaultArgsList = Arrays.asList(DEFAULT_ARGS);
    final List testArgsList = new ArrayList<>();
    testArgsList.add(grammarName);
    testArgsList.add(ruleName);
    testArgsList.addAll(defaultArgsList);
    if (fileName != null) {
      testArgsList.add(fileName);
    }
    final String[] testArgs = new String[testArgsList.size()];
    testArgsList.toArray(testArgs);
    final InteractiveTest test = new InteractiveTest(testArgs);
    test.run();
  }

  private static void usage() {
    System.err.println(
        "java io.fixprotocol.md.antlr.InteractiveTest [-i ] [-g