// (C) Uri Wilensky. https://github.com/NetLogo/NetLogo
package org.nlogo.prim.etc;
import org.nlogo.api.I18N;
import org.nlogo.api.LogoException;
import org.nlogo.api.LogoList;
import org.nlogo.api.Syntax;
import org.nlogo.nvm.ArgumentTypeException;
import org.nlogo.nvm.EngineException;
import org.nlogo.nvm.Reporter;
public final strictfp class _first
extends Reporter
implements org.nlogo.nvm.Pure {
@Override
public Syntax syntax() {
int[] right = {Syntax.ListType() | Syntax.StringType()};
int ret = Syntax.WildcardType();
return Syntax.reporterSyntax(right, ret);
}
@Override
public Object report(final org.nlogo.nvm.Context context) throws LogoException {
return report_1(context, args[0].report(context));
}
public Object report_1(final org.nlogo.nvm.Context context, Object obj)
throws LogoException {
if (obj instanceof LogoList) {
LogoList list = (LogoList) obj;
if (list.isEmpty()) {
throw new EngineException(context, this, I18N.errorsJ().get("org.nlogo.prim.etc.$common.emptyList"));
}
return list.first();
} else if (obj instanceof String) {
String string = (String) obj;
if (string.length() == 0) {
throw new EngineException(context, this, I18N.errorsJ().get("org.nlogo.prim.etc.$common.emptyString"));
}
return string.substring(0, 1);
} else {
throw new ArgumentTypeException
(context, this, 0, Syntax.ListType() | Syntax.StringType(), obj);
}
}
public Object report_2(final org.nlogo.nvm.Context context, LogoList list)
throws LogoException {
if (list.isEmpty()) {
throw new EngineException(context, this, I18N.errorsJ().get("org.nlogo.prim.etc.$common.emptyList"));
}
return list.first();
}
public Object report_3(final org.nlogo.nvm.Context context, String string)
throws LogoException {
if (string.length() == 0) {
throw new EngineException(context, this, I18N.errorsJ().get("org.nlogo.prim.etc.$common.emptyString"));
}
return string.substring(0, 1);
}
}