jason.stdlib.replace Maven / Gradle / Ivy
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package jason.stdlib;
import jason.asSemantics.DefaultInternalAction;
import jason.asSemantics.InternalAction;
import jason.asSemantics.TransitionSystem;
import jason.asSemantics.Unifier;
import jason.asSyntax.StringTerm;
import jason.asSyntax.StringTermImpl;
import jason.asSyntax.Term;
/**
Internal action: .replace(S1,S2,S3,S4).
Description: replaces S2 by S3 in S1, result in S4.
*/
@SuppressWarnings("serial")
public class replace extends DefaultInternalAction {
private static InternalAction singleton = null;
public static InternalAction create() {
if (singleton == null)
singleton = new replace();
return singleton;
}
@Override public int getMinArgs() {
return 4;
}
@Override public int getMaxArgs() {
return 4;
}
@Override
public Object execute(TransitionSystem ts, final Unifier un, final Term[] args) throws Exception {
checkArguments(args);
String arg = null;
if (args[0].isString())
arg = ((StringTerm)args[0]).getString();
else
arg = args[0].toString();
String s2 = ((StringTerm)args[1]).getString();
String s3 = ((StringTerm)args[2]).getString();
arg = arg.replaceAll(s2, s3);
return un.unifies(new StringTermImpl(arg), args[3]);
}
}