plantuml/src/net/sourceforge/plantuml/tim/stdlib/IsLight.java

/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2023, Arnaud Roques
 *
 * Project Info:  http://plantuml.com
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 * PlantUML distributed in the hope that it will be useful, but
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 * License for more details.
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 * 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.tim.stdlib;

import java.util.List;
import java.util.Map;
import java.util.Set;

import net.sourceforge.plantuml.LineLocation;
import net.sourceforge.plantuml.tim.EaterException;
import net.sourceforge.plantuml.tim.EaterExceptionLocated;
import net.sourceforge.plantuml.tim.TContext;
import net.sourceforge.plantuml.tim.TFunctionSignature;
import net.sourceforge.plantuml.tim.TMemory;
import net.sourceforge.plantuml.tim.expression.TValue;
import net.sourceforge.plantuml.ugraphic.color.HColor;
import net.sourceforge.plantuml.ugraphic.color.HColorSet;
import net.sourceforge.plantuml.ugraphic.color.NoSuchColorException;

public class IsLight extends SimpleReturnFunction {

	// Inspired from https://github.com/Qix-/color
	public TFunctionSignature getSignature() {
		return new TFunctionSignature("%is_light", 1);
	}

	public boolean canCover(int nbArg, Set<String> namedArgument) {
		return nbArg == 1;
	}

	public TValue executeReturnFunction(TContext context, TMemory memory, LineLocation location, List<TValue> values,
			Map<String, TValue> named) throws EaterException, EaterExceptionLocated {
		final String colorString = values.get(0).toString();
		try {
			final HColor color = HColorSet.instance().getColorLEGACY(colorString);
			return TValue.fromBoolean(!color.isDark());
		} catch (NoSuchColorException e) {
			throw EaterException.located("No such color");
		}
	}
}