/ 
AI-Prolog-0.65
River stage one • 3 direct dependents • 3 total dependents
/ aiprolog

NAME

aiprolog -- A simple Prolog shell using AI::Prolog.

SYNOPSIS

usage: aiprolog <optional prolog program name>

DESCRIPTION

aiprolog is a simple prolog shell using AI::Prolog as the backend.

See the documentation for more detail on the Prolog features that AI::Prolog currently accepts.

Commands

Commands specific to aiprolog shell:

"% halt"     -- stops the shell
"% help"     -- display this message

Note that the percent sign must preceed the command. The percent sign indicates a Prolog comment. Without that, aiprolog will think you're trying to execute a prolog command.

aiprolog-specific commands are case-insensitive.

Typical session

Save the following to a file named "append.pro":

append([],X,X).
append([W|X], Y, [W|Z]) :- append(X,Y,Z).

Then load it into the aiprolog shell by typing this at a shell:

aiprolog path/to/append.pro

In the shell, you should be greeted by a query prompt "?-". At this prompt, you can issue queries against the program. Try entering the following query:

append(X,Y,[1,2,3,4]).

The shell should respond with this:

append([],[1,2,3,4],[1,2,3,4]) ;

It should then appear to hang. It's waiting for you to type a character. If you type a semi-colon, it will attempt to resatisfy the query. If you keep doing that until there are no more valid results left, you'll see this:

?- append(X,Y,[1,2,3,4]).

append([],[1,2,3,4],[1,2,3,4]) ;

append([1],[2,3,4],[1,2,3,4]) ;

append([1,2],[3,4],[1,2,3,4]) ;

append([1,2,3],[4],[1,2,3,4]) ;

append([1,2,3,4],[],[1,2,3,4]) ; 

No

?-

The "No" is just Prolog's way of telling you there are no more results which satisfy your query. If you stop trying to satisfy results before all solutions have been found, you might see something like this:

?- append(X,Y,[1,2,3,4]).

append([],[1,2,3,4],[1,2,3,4]) ;

append([1],[2,3,4],[1,2,3,4]) ;

append([1,2],[3,4],[1,2,3,4])

Yes

?-

The "Yes" simply says that Prolog found results for you.

The game

If you are hoping to use this to play the bundled "Spider" game, I recommend the following:

aiprolog location/of/spider.pro

Then issue the "start" command (defined in "spider.pro").

?- start.