CommandHeader.java

/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://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,
 * USA.
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 * Original Author:  Arnaud Roques
 * 
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 */
package net.sourceforge.plantuml.command;

import net.sourceforge.plantuml.TitledDiagram;
import net.sourceforge.plantuml.klimt.creole.Display;
import net.sourceforge.plantuml.klimt.font.FontParam;
import net.sourceforge.plantuml.klimt.geom.HorizontalAlignment;
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.RegexOr;
import net.sourceforge.plantuml.regex.RegexResult;
import net.sourceforge.plantuml.utils.LineLocation;

public class CommandHeader extends SingleLineCommand2<TitledDiagram> {

	public static final CommandHeader ME = new CommandHeader();

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

	static IRegex getRegexConcat() {
		return RegexConcat.build(CommandHeader.class.getName(), RegexLeaf.start(), //
				new RegexOptional(new RegexLeaf(1, "POSITION", "(left|right|center)")), //
				RegexLeaf.spaceZeroOrMore(), //
				new RegexLeaf("header"), //
				new RegexOr( //
						new RegexConcat( //
								RegexLeaf.spaceZeroOrMore(), //
								new RegexLeaf(":"), //
								RegexLeaf.spaceZeroOrMore()), //
						RegexLeaf.spaceOneOrMore()), //
				new RegexOr(//
						new RegexLeaf(1, "LABEL1", "[%g](.*)[%g]"), //
						new RegexLeaf(1, "LABEL2", "(.*[%pLN_.].*)")), //
				RegexLeaf.end()); //
	}

	@Override
	protected CommandExecutionResult executeArg(TitledDiagram diagram, LineLocation location, RegexResult arg,
			ParserPass currentPass) {
		final String align = arg.get("POSITION", 0);
		HorizontalAlignment ha = HorizontalAlignment.fromString(align, HorizontalAlignment.RIGHT);
		if (align == null)
			ha = FontParam.HEADER.getStyleDefinition(null).getMergedStyle(diagram.getCurrentStyleBuilder())
					.getHorizontalAlignment();

		final Display s = Display.getWithNewlines(diagram.getPragma(), arg.getLazzy("LABEL", 0));
		diagram.updateHeader(location, s, ha);
		return CommandExecutionResult.ok();
	}
}