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MPL is a language that makes it easier to write applications for Minecraft 1.9 or higher. The final result of compiling an MPL application are command blocks that can be imported into your world in various ways. MPL comes with it's own editor that supports syntax- and error-highlighting and has a built in compiler.
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/*
 * Minecraft Programming Language (MPL): A language for easy development of command block
 * applications including an IDE.
 *
 * © Copyright (C) 2016 Adrodoc55
 *
 * This file is part of MPL.
 *
 * MPL is free software: you can redistribute it and/or modify it under the terms of the GNU General
 * Public License as published by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * MPL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with MPL. If not, see
 * .
 *
 *
 *
 * Minecraft Programming Language (MPL): Eine Sprache für die einfache Entwicklung von Commandoblock
 * Anwendungen, inklusive einer IDE.
 *
 * © Copyright (C) 2016 Adrodoc55
 *
 * Diese Datei ist Teil von MPL.
 *
 * MPL ist freie Software: Sie können diese unter den Bedingungen der GNU General Public License,
 * wie von der Free Software Foundation, Version 3 der Lizenz oder (nach Ihrer Wahl) jeder späteren
 * veröffentlichten Version, weiterverbreiten und/oder modifizieren.
 *
 * MPL wird in der Hoffnung, dass es nützlich sein wird, aber OHNE JEDE GEWÄHRLEISTUNG,
 * bereitgestellt; sogar ohne die implizite Gewährleistung der MARKTFÄHIGKEIT oder EIGNUNG FÜR EINEN
 * BESTIMMTEN ZWECK. Siehe die GNU General Public License für weitere Details.
 *
 * Sie sollten eine Kopie der GNU General Public License zusammen mit MPL erhalten haben. Wenn
 * nicht, siehe .
 */
package de.adrodoc55.minecraft.mpl.ide.autocompletion;

import static com.google.common.base.Preconditions.checkState;

import java.lang.reflect.UndeclaredThrowableException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.annotation.Nullable;
import javax.swing.text.BadLocationException;
import javax.swing.text.Element;
import javax.swing.text.JTextComponent;

import org.antlr.v4.runtime.Token;

import de.adrodoc55.commons.DocumentUtils;
import de.adrodoc55.commons.FileUtils;
import de.adrodoc55.commons.Filter;
import lombok.Getter;

/**
 * @author Adrodoc55
 */
@Getter
public abstract class AutoCompletionAction {
  private static final Pattern INSERT = Pattern.compile("(? CURSOR_INSERTS = insert -> CURSOR.equals(insert);
  private static final Filter NON_CURSOR_INSERTS = insert -> !CURSOR.equals(insert);

  protected final int startIndex;
  protected final @Nullable Token token;

  public AutoCompletionAction(int startIndex, @Nullable Token token) {
    this.startIndex = token != null ? token.getStartIndex() : startIndex;
    this.token = token;
  }

  public void performOn(JTextComponent component) {
    Element root = component.getDocument().getDefaultRootElement();
    Element line = root.getElement(root.getElementIndex(startIndex));
    int offsetInLine = startIndex - line.getStartOffset();

    int cursorIndex = getCursorIndex(offsetInLine);
    String template = processTemplate(offsetInLine);
    try {
      int length = getLength();
      DocumentUtils.replace(component.getDocument(), startIndex, length, template);
      component.getCaret().setDot(startIndex + cursorIndex);
    } catch (BadLocationException ex) {
      throw new UndeclaredThrowableException(ex);
    }
  }

  public String processTemplate(int offsetInLine) {
    return processTemplate(offsetInLine, true);
  }

  private String processTemplate(int offsetInLine, boolean processCursor) {
    String template = FileUtils.toUnixLineEnding(getTemplate());
    String indent = new String(new char[offsetInLine]).replace('\0', ' ');
    template = template.replace("\n", "\n" + indent);
    template = replaceVariables(template, NON_CURSOR_INSERTS);
    if (processCursor) {
      template = replaceVariables(template, CURSOR_INSERTS);
    }
    return template;
  }

  public int getCursorIndex(int offsetInLine) {
    CharSequence template = processTemplate(offsetInLine, false);
    Matcher matcher = INSERT.matcher(template);
    while (matcher.find()) {
      String match = matcher.group(2);
      if (CURSOR.equals(match)) {
        String leadingDollar = matcher.group(1);
        leadingDollar = leadingDollar != null ? leadingDollar : "";
        return matcher.start() + leadingDollar.length() / 2;
      }
    }
    return template.length();
  }

  private String replaceVariables(String template, Filter filter) {
    Matcher matcher = INSERT.matcher(template);
    StringBuffer sb = new StringBuffer(template.length());
    while (matcher.find()) {
      String type = matcher.group(2);
      if (!filter.matches(type)) {
        continue;
      }
      String dollars = matcher.group(1);
      String replacement;
      int dollarCount = dollars.length();
      if (dollarCount % 2 == 0) {
        replacement = matcher.group().substring(dollarCount / 2);
      } else {
        checkState(type != null,
            "Template has incomplete variables. Type '$$' to enter the dollar character.");
        replacement = dollars.substring((dollarCount + 1) / 2) + getReplacement(type);
      }
      matcher.appendReplacement(sb, Matcher.quoteReplacement(replacement));
    }
    matcher.appendTail(sb);
    return sb.toString();
  }

  private String getReplacement(String variable) {
    switch (variable) {
      case CURSOR:
        return "";
      case "token":
        return getTokenString();
      default:
        throw new IllegalArgumentException("Unknown variable '" + variable + "'");
    }
  }

  private String getTokenString() {
    if (token != null)
      return token.getText();
    else
      return "";
  }

  public int getLength() {
    if (token != null)
      return token.getStopIndex() - startIndex + 1;
    else
      return 0;
  }

  protected abstract String getTemplate();

  public abstract String getDisplayName();

  public abstract boolean shouldBeProposed(AutoCompletionContext context);

  public CharSequence getDescription() {
    return processTemplate(0);
  }
}