de.adrodoc55.minecraft.mpl.ide.autocompletion.AutoCompletion.java Source code

Introduction

Here is the source code for de.adrodoc55.minecraft.mpl.ide.autocompletion.AutoCompletion.java

Source

/*
 * 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
 * <http://www.gnu.org/licenses/>.
 *
 *
 *
 * Minecraft Programming Language (MPL): Eine Sprache fr die einfache Entwicklung von Commandoblock
 * Anwendungen, inklusive einer IDE.
 *
 *  Copyright (C) 2016 Adrodoc55
 *
 * Diese Datei ist Teil von MPL.
 *
 * MPL ist freie Software: Sie knnen diese unter den Bedingungen der GNU General Public License,
 * wie von der Free Software Foundation, Version 3 der Lizenz oder (nach Ihrer Wahl) jeder spteren
 * verffentlichten Version, weiterverbreiten und/oder modifizieren.
 *
 * MPL wird in der Hoffnung, dass es ntzlich sein wird, aber OHNE JEDE GEWHRLEISTUNG,
 * bereitgestellt; sogar ohne die implizite Gewhrleistung der MARKTFHIGKEIT oder EIGNUNG FR EINEN
 * BESTIMMTEN ZWECK. Siehe die GNU General Public License fr weitere Details.
 *
 * Sie sollten eine Kopie der GNU General Public License zusammen mit MPL erhalten haben. Wenn
 * nicht, siehe <http://www.gnu.org/licenses/>.
 */
package de.adrodoc55.minecraft.mpl.ide.autocompletion;

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

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 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<AutoCompletionAction> getOptions(int index, String text) {
        AutoCompletionContext context = getContext(index, text);
        ArrayList<AutoCompletionAction> 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<AutoCompletionAction> getAllActions(int index, Token token) {
        List<AutoCompletionAction> 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;
    }

}