/*
* Copyright 2014 MovingBlocks
*
* 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 org.terasology.logic.console.ui;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.terasology.logic.console.Console;
import org.terasology.logic.console.ConsoleColors;
import org.terasology.logic.console.Message;
import org.terasology.rendering.FontColor;
import org.terasology.utilities.CamelCaseMatcher;
import com.google.common.collect.Lists;
/**
* A text completion engine with cycle-through functionality
* @author Martin Steiger
*/
public class CyclingTabCompletionEngine implements TabCompletionEngine {
private static final int MAX_CYCLES = 10;
private final Console console;
private final Collection<String> allNames;
private final List<String> matchList = Lists.newArrayList();
private int index;
private Message prevMessage;
public CyclingTabCompletionEngine(Console console, Collection<String> allNames) {
this.console = console;
this.allNames = allNames;
}
@Override
public String complete(String text) {
if (!matchList.contains(text)) {
reset();
String cmdQuery = text.trim();
Collection<String> matches = CamelCaseMatcher.getMatches(cmdQuery, allNames);
if (matches.isEmpty()) {
return text;
}
if (matches.size() == 1) {
return matches.iterator().next();
}
if (matches.size() > MAX_CYCLES) {
console.addMessage(new Message("Too many hits, please refine your search"));
return text;
}
matchList.addAll(matches);
Collections.sort(matchList);
}
StringBuilder commandMatches = new StringBuilder();
for (int i = 0; i < matchList.size(); i++) {
if (commandMatches.length() != 0) {
commandMatches.append(" ");
}
String name = matchList.get(i);
if (index == i) {
name = FontColor.getColored(name, ConsoleColors.COMMAND);
}
commandMatches.append(name);
}
Message message = new Message(commandMatches.toString());
String cmd = matchList.get(index);
if (prevMessage != null) {
console.replaceMessage(prevMessage, message);
} else {
console.addMessage(message);
}
prevMessage = message;
index = (index + 1) % matchList.size();
return cmd;
}
@Override
public void reset() {
if (prevMessage != null) {
console.removeMessage(prevMessage);
}
prevMessage = null;
matchList.clear();
index = 0;
}
}