plantuml/src/net/sourceforge/plantuml/command/CommandScale.java

/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2023, Arnaud Roques
 *
 * Project Info:  http://plantuml.com
 * 
 * If you like this project or if you find it useful, you can support us at:
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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
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
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 * Original Author:  Arnaud Roques
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 */
package net.sourceforge.plantuml.command;

import net.sourceforge.plantuml.AbstractPSystem;
import net.sourceforge.plantuml.LineLocation;
import net.sourceforge.plantuml.ScaleSimple;
import net.sourceforge.plantuml.command.regex.IRegex;
import net.sourceforge.plantuml.command.regex.RegexConcat;
import net.sourceforge.plantuml.command.regex.RegexLeaf;
import net.sourceforge.plantuml.command.regex.RegexOptional;
import net.sourceforge.plantuml.command.regex.RegexResult;

public class CommandScale extends SingleLineCommand2<AbstractPSystem> {

	public static final CommandScale ME = new CommandScale();

	private CommandScale() {
		super(getRegexConcat());
	}

	static IRegex getRegexConcat() {
		return RegexConcat.build(CommandScale.class.getName(), RegexLeaf.start(), //
				new RegexLeaf("scale"), //
				RegexLeaf.spaceOneOrMore(), //
				new RegexLeaf("SCALE", "([0-9.]+)"), //
				new RegexOptional( //
						new RegexConcat( //
								RegexLeaf.spaceZeroOrMore(), //
								new RegexLeaf("/"), //
								RegexLeaf.spaceZeroOrMore(), //
								new RegexLeaf("DIV", "([0-9.]+)") //
						)), RegexLeaf.end()); //
	}

	@Override
	protected CommandExecutionResult executeArg(AbstractPSystem diagram, LineLocation location, RegexResult arg) {
		double scale = Double.parseDouble(arg.get("SCALE", 0));
		if (scale == 0)
			return CommandExecutionResult.error("Scale cannot be zero");

		if (arg.get("DIV", 0) != null) {
			final double div = Double.parseDouble(arg.get("DIV", 0));
			if (div == 0)
				return CommandExecutionResult.error("Scale cannot be zero");

			scale /= div;
		}
		diagram.setScale(new ScaleSimple(scale));
		return CommandExecutionResult.ok();
	}

}