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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
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package net.sourceforge.plantuml.timingdiagram.command;

import net.sourceforge.plantuml.command.CommandExecutionResult;
import net.sourceforge.plantuml.command.SingleLineCommand2;
import net.sourceforge.plantuml.klimt.color.NoSuchColorException;
import net.sourceforge.plantuml.regex.IRegex;
import net.sourceforge.plantuml.regex.RegexConcat;
import net.sourceforge.plantuml.regex.RegexLeaf;
import net.sourceforge.plantuml.regex.RegexOptional;
import net.sourceforge.plantuml.regex.RegexResult;
import net.sourceforge.plantuml.sequencediagram.command.CommandArrow;
import net.sourceforge.plantuml.skin.ArrowConfiguration;
import net.sourceforge.plantuml.timingdiagram.Player;
import net.sourceforge.plantuml.timingdiagram.TimeTick;
import net.sourceforge.plantuml.timingdiagram.TimingDiagram;
import net.sourceforge.plantuml.utils.LineLocation;

public class CommandConstraint extends SingleLineCommand2 {

	public CommandConstraint() {
		super(getRegexConcat());
	}

	private static IRegex getRegexConcat() {
		return RegexConcat.build(CommandConstraint.class.getName(), RegexLeaf.start(), //
				new RegexLeaf("PART1", "(" + CommandTimeMessage.PLAYER_CODE + ")?"), //
				TimeTickBuilder.expressionAtWithArobase("TIME1"), //
				RegexLeaf.spaceZeroOrMore(), //
				new RegexLeaf("\\<"), //
				new RegexLeaf("(-+)"), //
				new RegexLeaf("ARROW_STYLE1", CommandArrow.getColorOrStylePattern()), //
				new RegexLeaf("(-*)"), //
				new RegexLeaf("\\>"), //
				RegexLeaf.spaceZeroOrMore(), //
				TimeTickBuilder.expressionAtWithArobase("TIME2"), //
				RegexLeaf.spaceZeroOrMore(), //
				new RegexOptional( //
						new RegexConcat( //
								new RegexLeaf(":"), //
								RegexLeaf.spaceZeroOrMore(), //
								new RegexLeaf("MESSAGE", "(.*)") //
						)), //
				RegexLeaf.spaceZeroOrMore(), RegexLeaf.end());
	}

	@Override
	final protected CommandExecutionResult executeArg(TimingDiagram diagram, LineLocation location, RegexResult arg)
			throws NoSuchColorException {
		final String part1 = arg.get("PART1", 0);
		final Player player1;
		if (part1 == null) {
			player1 = diagram.getLastPlayer();
			if (player1 == null)
				return CommandExecutionResult.error("You have to provide a participant");

		} else {
			player1 = diagram.getPlayer(part1);
			if (player1 == null)
				return CommandExecutionResult.error("No such participant " + part1);

		}
		final TimeTick tick1 = TimeTickBuilder.parseTimeTick("TIME1", arg, diagram);
		if (tick1 == null)
			return CommandExecutionResult.error("Unknown time label");

		final TimeTick restore = diagram.getNow();
		diagram.updateNow(tick1);
		final TimeTick tick2 = TimeTickBuilder.parseTimeTick("TIME2", arg, diagram);
		diagram.updateNow(restore);
		if (tick2 == null)
			return CommandExecutionResult.error("Unknown time label");

		ArrowConfiguration config = ArrowConfiguration.withDirectionBoth();
		config = CommandArrow.applyStyle(arg.getLazzy("ARROW_STYLE", 0), config);

		player1.createConstraint(tick1, tick2, arg.get("MESSAGE", 0), config);
		return CommandExecutionResult.ok();
	}

}