net.sourceforge.plantuml.tim.stdlib.IsLight Maven / Gradle / Ivy

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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.klimt.color.HColor;
import net.sourceforge.plantuml.klimt.color.HColorSet;
import net.sourceforge.plantuml.klimt.color.NoSuchColorException;
import net.sourceforge.plantuml.text.StringLocated;
import net.sourceforge.plantuml.tim.EaterException;
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;

public class IsLight extends SimpleReturnFunction {

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

	@Override
	public boolean canCover(int nbArg, Set namedArgument) {
		return nbArg == 1;
	}

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