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;
import net.fortytwo.ripple.model.RippleValue;
/**
* A primitive which consumes a string and a regular expression, producing a
* Boolean value of true if the regular expression matches the string, otherwise
* false.
*
* @author Joshua Shinavier (http://fortytwo.net)
*/
public class Matches extends PrimitiveStackMapping {
private static final String[] IDENTIFIERS = {
StringLibrary.NS_2013_03 + "matches",
StringLibrary.NS_2008_08 + "matches",
StringLibrary.NS_2007_08 + "matches"};
public String[] getIdentifiers() {
return IDENTIFIERS;
}
public Matches()
throws RippleException {
super();
}
public Parameter[] getParameters() {
return new Parameter[]{
new Parameter("s", null, true),
new Parameter("regex", null, true)};
}
public String getComment() {
return "s regex => b -- where b is true if the given string matches the given regular expression," +
" otherwise false";
}
public void apply(final RippleList arg,
final Sink<RippleList> solutions,
final ModelConnection mc) throws RippleException {
RippleList stack = arg;
String regex, s;
RippleValue result;
regex = mc.toString(stack.getFirst());
stack = stack.getRest();
s = mc.toString(stack.getFirst());
stack = stack.getRest();
try {
result = mc.valueOf(s.matches(regex));
solutions.put(
stack.push(result));
} catch (java.util.regex.PatternSyntaxException e) {
// Hard fail (for now).
throw new RippleException(e);
}
}
}