-module(macro).
-compile(export_all).

file(F) -> case file:read_file(F) of
           {ok,B}    -> {ok,unicode:characters_to_list(B)};
           {error,E} -> io:format(lists:concat(["File ", F, " : ", E, "~n"])),
                        {error,file} end.

lexer({error,S}) -> {error,S};
lexer({ok,S})    -> case cub_lexer:string(S) of
                    {ok,T,_}          -> {ok,T};
                    {error,{L,A,X},_} -> io:format(lists:concat(["Line ", L, " ", A, " : ", element(2,X)])),
                                         io:format("~n"),
                                         {error,lexer} end.

parser({error,T}) -> {error,T};
parser({ok,T})    -> case cub_parser:parse(T) of
                     {ok,AST}        -> {ok,AST};
                     {error,{L,A,S}} -> io:format(lists:concat(["Line ", L, " ", A, " : "| S])),
                                        io:format("~n"),
                                        {error,parser} end.

parse(F)        -> snd(parser(lexer({ok,F}))).
a(F)            -> snd(parser(lexer(file(F)))).

fst({X,_})      -> X.
snd({error,X})  -> {error,X};
snd({_,[X]})    -> X;
snd({_,X})      -> X.