// (C) Uri Wilensky. https://github.com/NetLogo/NetLogo
package org.nlogo.prim.etc;
import org.nlogo.api.Dump;
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 _item
extends Reporter
implements org.nlogo.nvm.Pure {
@Override
public Object report(final org.nlogo.nvm.Context context) throws LogoException {
int index = argEvalIntValue(context, 0);
Object obj = args[1].report(context);
if (index < 0) {
throw new EngineException(context, this,
I18N.errorsJ().getN("org.nlogo.prim.etc.$common.negativeIndex", index));
}
if (obj instanceof LogoList) {
LogoList list = (LogoList) obj;
if (index >= list.size()) {
throw new EngineException(context, this,
I18N.errorsJ().getN("org.nlogo.prim.etc.$common.indexExceedsListSize",
index, Dump.logoObject(list), list.size()));
}
return list.get(index);
} else if (obj instanceof String) {
String string = (String) obj;
if (index >= string.length()) {
throw new EngineException(context, this,
I18N.errorsJ().getN("org.nlogo.prim.etc.$common.indexExceedsListSize",
index, Dump.logoObject(string), string.length()));
}
return string.substring(index, index + 1);
} else {
throw new ArgumentTypeException
(context, this, 1, Syntax.ListType() | Syntax.StringType(), obj);
}
}
@Override
public Syntax syntax() {
int[] right = {Syntax.NumberType(),
Syntax.ListType() | Syntax.StringType()};
int ret = Syntax.WildcardType();
return Syntax.reporterSyntax(right, ret);
}
}