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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 java.util.ArrayList;
import java.util.List;

import javax.annotation.Nullable;

import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.Token;
import org.antlr.v4.runtime.TokenStream;
import org.antlr.v4.runtime.tree.ParseTreeWalker;

import de.adrodoc55.minecraft.mpl.antlr.MplLexer;
import de.adrodoc55.minecraft.mpl.antlr.MplParser;
import de.adrodoc55.minecraft.mpl.antlr.MplParser.FileContext;

/**
 * @author Adrodoc55
 */
public class AutoCompletion {

  private AutoCompletion() throws Throwable {
    throw new Throwable("Utils Classes cannot be instantiated!");
  }

  public static @Nullable AutoCompletionContext getContext(int index, String text) {
    ANTLRInputStream input = new ANTLRInputStream(text);
    MplLexer lexer = new MplLexer(input);
    lexer.removeErrorListeners();
    TokenStream tokens = new CommonTokenStream(lexer);
    MplParser parser = new MplParser(tokens);
    parser.removeErrorListeners();
    FileContext ctx = parser.file();

    AutoCompletionListener listener = new AutoCompletionListener(index);
    try {
      new ParseTreeWalker().walk(listener, ctx);
    } catch (ResultException earlyExit) {
      return earlyExit.getResult();
    }
    return null;
  }

  public static List getOptions(int index, String text) {
    AutoCompletionContext context = getContext(index, text);
    ArrayList options = new ArrayList<>();
    if (context == null) {
      return options;
    }
    Token token = context.getToken();
    for (AutoCompletionAction action : getAllActions(index, token)) {
      if (action.shouldBeProposed(context)) {
        options.add(action);
      }
    }
    return options;
  }

  private static List getAllActions(int index, Token token) {
    List actions = new ArrayList<>();
    actions.add(new NewIncludeAction(index, token));
    actions.add(new NewIfAction(index, token));
    actions.add(new NewIfElseAction(index, token));
    actions.add(new NewWhileAction(index, token));
    actions.add(new NewDoWhileAction(index, token));
    actions.add(new NewProcessAction(index, token));
    return actions;
  }

}