// (C) Uri Wilensky. https://github.com/NetLogo/NetLogo
package org.nlogo.prim.etc;
import org.nlogo.api.LogoException;
import org.nlogo.api.LogoList;
import org.nlogo.api.Syntax;
import org.nlogo.nvm.ArgumentTypeException;
import org.nlogo.nvm.Reporter;
public final strictfp class _empty
extends Reporter
implements org.nlogo.nvm.Pure {
@Override
public Object report(final org.nlogo.nvm.Context context) throws LogoException {
Object obj = args[0].report(context);
if (obj instanceof LogoList) {
LogoList list = (LogoList) obj;
return list.isEmpty() ? Boolean.TRUE : Boolean.FALSE;
} else if (obj instanceof String) {
String string = (String) obj;
return (string.length() == 0) ? Boolean.TRUE : Boolean.FALSE;
} else {
throw new ArgumentTypeException(context, this, 0, Syntax.ListType() | Syntax.StringType(), obj);
}
}
@Override
public Syntax syntax() {
int[] right = {Syntax.ListType() | Syntax.StringType()};
int ret = Syntax.BooleanType();
return Syntax.reporterSyntax(right, ret);
}
}