Module Language.Prolog.Goodies

Selector operations on Prolog programs

plList :: [PlTerm] -> PlTerm   

Constructs a Prolog list object from a list of Prolog terms.

isPlVar :: PlTerm -> Bool   

Is a Prolog term a variable?

rootOf :: PlTerm -> (String, Int)   

The name and the arity of the root of a Prolog term, where the names of variables are ignored (i.e., empty).

argsOf :: PlTerm -> [PlTerm]   

The arguments of a Prolog term.

goalVars :: PlGoal -> [String]   

The set of all variables occurring in a Prolog goal.

termVars :: PlTerm -> [String]   

The set of all variables occurring in a Prolog term.

termsVars :: [PlTerm] -> [String]   

The set of all variables occurring in a list of Prolog terms.

termVarOccs :: PlTerm -> [String]   

The multi-set of all occurrences of variables in a Prolog term.

goalConstrs :: PlGoal -> [(String, Int)]   

The set of all data constructors together with their arities used in a Prolog goal.

termConstrs :: PlTerm -> [(String, Int)]   

The set of all data constructors together with their arities used in a Prolog term.