ChallengeOneOrMore.java

/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 * 
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 * This file is part of PlantUML.
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 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
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 *
 * PlantUML 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 this library; if not, write to the Free Software
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 * Original Author:  Arnaud Roques
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 */
package com.plantuml.ubrex;

public class ChallengeOneOrMore implements Challenge {

	private final Challenge origin;

	public ChallengeOneOrMore(Challenge origin) {
		this.origin = origin;
	}
	
	@Override
	public String toString() {
		return "ChallengeOneOrMore:" + origin;
	}


	@Override
	public ChallengeResult runChallenge(TextNavigator string, int position) {
		Capture capture = Capture.EMPTY;

		int currentPos = position;
		while (true) {
			final ChallengeResult shallWePass = origin.runChallenge(string, currentPos);
			if (shallWePass.getFullCaptureLength() < 0)
				if (currentPos > position)
					return new ChallengeResult(currentPos - position, capture);
				else
					return new ChallengeResult(NO_MATCH);
			if (shallWePass.getFullCaptureLength() == 0)
				throw new IllegalStateException("infinite loop");
			capture = capture.merge(shallWePass.getCapture());
			currentPos += shallWePass.getFullCaptureLength();
		}
	}

}