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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.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
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 * (C) Copyright 2009-2024, Arnaud Roques
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 * Project Info:  https://plantuml.com
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 * under the terms of the GNU General Public License V2.
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 * LICENSE ("AGREEMENT"). [GNU General Public License V2]
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 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
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 *
 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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 * 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.
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 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
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 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this GPL v2 license.
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 * The generated images can then be used without any reference to the GPL v2 license.
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 * although this will be appreciated by the PlantUML team.
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 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.openiconic;

import net.sourceforge.plantuml.StringUtils;

public class SvgCommandLetter implements SvgCommand {

	final private char letter;

	public SvgCommandLetter(String letter) {
		if (letter.matches("[mlhvzsacqtMLHVZSACQT]") == false)
			throw new IllegalArgumentException(letter);

		this.letter = letter.charAt(0);
	}

	@Override
	public String toString() {
		return " " + letter;
	}

	public String toSvg() {
		return "" + letter;
	}

	public int argumentNumber() {
		switch (StringUtils.goLowerCase(letter)) {
		case 'm':
		case 'l':
		case 't':
			return 2;
		case 'h':
		case 'v':
			return 1;
		case 'z':
			return 0;
		case 'c':
			return 6;
		case 'q':
		case 's':
			return 4;
		case 'a':
			return 7;
		}
		throw new UnsupportedOperationException("" + letter);
	}

	public boolean isUpperCase() {
		return Character.isUpperCase(letter);
	}

	public boolean is(char c) {
		return this.letter == c;
	}

	public char getLetter() {
		return letter;
	}

	public SvgCommandLetter implicit() {
		// https://stackoverflow.com/questions/29251389/svg-path-spec-moveto-and-implicit-lineto
		if (letter == 'm')
			return new SvgCommandLetter("l");

		if (letter == 'M')
			return new SvgCommandLetter("L");

		return this;
	}
}