package net.fortytwo.ripple.libs.string;
import net.fortytwo.flow.Sink;
import net.fortytwo.ripple.RippleException;
import net.fortytwo.ripple.model.ModelConnection;
import net.fortytwo.ripple.model.PrimitiveStackMapping;
import net.fortytwo.ripple.model.RippleList;
/**
* A primitive which consumes a string and a substring and produces the index of
* the last occurrence of the substring.
*
* @author Joshua Shinavier (http://fortytwo.net)
*/
public class LastIndexOf extends PrimitiveStackMapping {
private static final String[] IDENTIFIERS = {
StringLibrary.NS_2013_03 + "last-index-of",
StringLibrary.NS_2008_08 + "lastIndexOf",
StringLibrary.NS_2007_08 + "lastIndexOf"};
public String[] getIdentifiers() {
return IDENTIFIERS;
}
public LastIndexOf()
throws RippleException {
super();
}
public Parameter[] getParameters() {
return new Parameter[]{
new Parameter("str", null, true),
new Parameter("substr", null, true)};
}
public String getComment() {
return "str substr => i -- where i is the index of the last occurrence of substr in str," +
" or -1 if it does not occur";
}
public void apply(final RippleList arg,
final Sink<RippleList> solutions,
final ModelConnection mc) throws RippleException {
RippleList stack = arg;
String str, substr;
int result;
substr = mc.toString(stack.getFirst());
stack = stack.getRest();
str = mc.toString(stack.getFirst());
stack = stack.getRest();
result = str.lastIndexOf(substr);
solutions.put(
stack.push(mc.valueOf(result)));
}
}