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 package jason.stdlib;
 

Internal action: .list.

Description: checks whether the argument is a list, e.g.: "[a,b]", "[]".

Parameter:

  • + argument (any term): the term to be checked.

Examples:

  • .list([a,b,c]): true.
  • .list([a,b,c(X)]): true.
  • .list(b(10)): false.
  • .list(10): false.
  • .list("home page"): false.
  • .list(X): false if X is free, true if X is bound to a list.
  • .list(a(X)): false.

public class list extends DefaultInternalAction {
    
    private static InternalAction singleton = null;
    public static InternalAction create() {
        if ( == null
             = new list();
        return ;
    }
    @Override public int getMinArgs() { return 1; }
    @Override public int getMaxArgs() { return 1; }
    @Override
    public Object execute(TransitionSystem tsUnifier unTerm[] argsthrows Exception {
        checkArguments(args);
        return args[0].isList();
    }
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