(* camlp4r *)
(* $Id$ *)

open MLast;

value not_impl name x =
  let desc =
    if Obj.is_block (Obj.repr x) then
      "tag = " ^ string_of_int (Obj.tag (Obj.repr x))
    else "int_val = " ^ string_of_int (Obj.magic x)
  in
  do {
    Printf.eprintf "pr_depend: not impl: %s; %s\n" name desc; flush stderr;
  }
;

module StrSet =
  Set.Make (struct type t = string; value compare = compare; end)
;

value fset = ref StrSet.empty;
value addmodule s = fset.val := StrSet.add s fset.val;

value list = List.iter;

value option f =
  fun
  [ Some x -> f x
  | None -> () ]
;

value longident =
  fun
  [ [s; _ :: _] -> addmodule s
  | _ -> () ]
;

value rec ctyp =
  fun
  [ TyAcc _ t _ -> ctyp_module t
  | TyAli _ t1 t2 -> do { ctyp t1; ctyp t2; }
  | TyApp _ t1 t2 -> do { ctyp t1; ctyp t2; }
  | TyAny _ -> ()
  | TyArr _ t1 t2 -> do { ctyp t1; ctyp t2; }
  | TyCls _ li -> longident li
  | TyLab _ _ t -> ctyp t
  | TyLid _ _ -> ()
  | TyMan _ t1 t2 -> do { ctyp t1; ctyp t2; }
  | TyOlb _ _ t -> ctyp t
  | TyQuo _ _ -> ()
  | TyRec _ ldl -> list label_decl ldl
  | TySum _ cdl -> list constr_decl cdl
  | TyTup _ tl -> list ctyp tl
  | TyVrn _ sbtll _ -> list variant sbtll
  | x -> not_impl "ctyp" x ]
and constr_decl (_, _, tl) = list ctyp tl
and label_decl (_, _, _, t) = ctyp t
and variant =
  fun
  [ RfTag _ _ tl -> list ctyp tl
  | RfInh t -> ctyp t ]
and ctyp_module =
  fun
  [ TyAcc _ t _ -> ctyp_module t
  | TyApp _ t1 t2 -> do { ctyp t1; ctyp t2; }
  | TyUid _ m -> addmodule m
  | x -> not_impl "ctyp_module" x ]
;

value rec patt =
  fun
  [ PaAcc _ p _ -> patt_module p
  | PaAli _ p1 p2 -> do { patt p1; patt p2; }
  | PaAny _ -> ()
  | PaApp _ p1 p2 -> do { patt p1; patt p2; }
  | PaArr _ pl -> list patt pl
  | PaChr _ _ -> ()
  | PaInt _ _ -> ()
  | PaLab _ _ p -> patt p
  | PaLid _ _ -> ()
  | PaOlb _ _ p eo -> patt p
  | PaOrp _ p1 p2 -> do { patt p1; patt p2; }
  | PaRec _ lpl -> list label_patt lpl
  | PaRng _ p1 p2 -> do { patt p1; patt p2; }
  | PaStr _ _ -> ()
  | PaTup _ pl -> list patt pl
  | PaTyc _ p t -> do { patt p; ctyp t; }
  | PaUid _ _ -> ()
  | PaVrn _ _ -> ()
  | x -> not_impl "patt" x ]
and patt_module =
  fun
  [ PaUid _ m -> addmodule m
  | PaAcc _ p _ -> patt_module p
  | x -> not_impl "patt_module" x ]
and label_patt (p1, p2) = do { patt p1; patt p2; };

value rec expr =
  fun
  [ ExAcc _ e1 e2 -> do { expr_module e1; expr e2; }
  | ExApp _ e1 e2 -> do { expr e1; expr e2; }
  | ExAre _ e1 e2 -> do { expr e1; expr e2; }
  | ExArr _ el -> list expr el
  | ExAss _ e1 e2 -> do { expr e1; expr e2; }
  | ExChr _ _ -> ()
  | ExCoe _ e t1 t2 -> do { expr e; option ctyp t1; ctyp t2 }
  | ExFor _ _ e1 e2 _ el -> do { expr e1; expr e2; list expr el; }
  | ExFun _ pwel -> list match_case pwel
  | ExIfe _ e1 e2 e3 -> do { expr e1; expr e2; expr e3; }
  | ExInt _ _ -> ()
  | ExFlo _ _ -> ()
  | ExLab _ _ e -> expr e
  | ExLaz _ e -> expr e
  | ExLet _ _ pel e -> do { list let_binding pel; expr e; }
  | ExLid _ _ -> ()
  | ExLmd _ _ me e -> do { module_expr me; expr e; }
  | ExMat _ e pwel -> do { expr e; list match_case pwel; }
  | ExNew _ li -> longident li
  | ExOlb _ _ e -> expr e
  | ExRec _ lel w -> do { list label_expr lel; option expr w; }
  | ExSeq _ el -> list expr el
  | ExSnd _ e _ -> expr e
  | ExSte _ e1 e2 -> do { expr e1; expr e2; }
  | ExStr _ _ -> ()
  | ExTry _ e pwel -> do { expr e; list match_case pwel; }
  | ExTup _ el -> list expr el
  | ExTyc _ e t -> do { expr e; ctyp t; }
  | ExUid _ _ -> ()
  | ExVrn _ _ -> ()
  | ExWhi _ e el -> do { expr e; list expr el; }
  | x -> not_impl "expr" x ]
and expr_module =
  fun
  [ ExUid _ m -> addmodule m
  | e -> expr e ]
and let_binding (p, e) = do { patt p; expr e }
and label_expr (p, e) = do { patt p; expr e }
and match_case (p, w, e) = do { patt p; option expr w; expr e; }
and module_type =
  fun
  [ MtAcc _ (MtUid _ m) _ -> addmodule m
  | MtFun _ _ mt1 mt2 -> do { module_type mt1; module_type mt2; }
  | MtSig _ sil -> list sig_item sil
  | MtUid _ _ -> ()
  | MtWit _ mt wc -> do { module_type mt; list with_constr wc; }
  | x -> not_impl "module_type" x ]
and with_constr =
  fun
  [ WcTyp _ _ _ t -> ctyp t
  | x -> not_impl "with_constr" x ]
and sig_item =
  fun
  [ SgDcl _ sil -> list sig_item sil
  | SgExc _ _ tl -> list ctyp tl
  | SgExt _ _ t _ -> ctyp t
  | SgMod _ _ mt -> module_type mt
  | SgMty _ _ mt -> module_type mt
  | SgOpn _ [s :: _] -> addmodule s
  | SgTyp _ tdl -> list type_decl tdl
  | SgVal _ _ t -> ctyp t
  | x -> not_impl "sig_item" x ]
and module_expr =
  fun
  [ MeAcc _ (MeUid _ m) _ -> addmodule m
  | MeApp _ me1 me2 -> do { module_expr me1; module_expr me2; }
  | MeFun _ _ mt me -> do { module_type mt; module_expr me; }
  | MeStr _ sil -> list str_item sil
  | MeTyc _ me mt -> do { module_expr me; module_type mt; }
  | MeUid _ _ -> ()
  | x -> not_impl "module_expr" x ]
and str_item =
  fun
  [ StCls _ cil -> list (fun ci -> class_expr ci.ciExp) cil
  | StDcl _ sil -> list str_item sil
  | StDir _ _ _ -> ()
  | StExc _ _ tl _ -> list ctyp tl
  | StExp _ e -> expr e
  | StExt _ _ t _ -> ctyp t
  | StMod _ _ me -> module_expr me
  | StMty _ _ mt -> module_type mt
  | StOpn _ [s :: _] -> addmodule s
  | StTyp _ tdl -> list type_decl tdl
  | StVal _ _ pel -> list let_binding pel
  | x -> not_impl "str_item" x ]
and type_decl (_, _, t, _) = ctyp t
and class_expr =
  fun
  [ CeApp _ ce e -> do { class_expr ce; expr e; }
  | CeCon _ li tl -> do { longident li; list ctyp tl; }
  | CeFun _ p ce -> do { patt p; class_expr ce; }
  | CeLet _ _ pel ce -> do { list let_binding pel; class_expr ce; }
  | CeStr _ po csil -> do { option patt po; list class_str_item csil; }
  | x -> not_impl "class_expr" x ]
and class_str_item =
  fun
  [ CrInh _ ce _ -> class_expr ce
  | CrIni _ e -> expr e
  | CrMth _ _ _ e -> expr e
  | CrVal _ _ _ e -> expr e
  | CrVir _ _ _ t -> ctyp t
  | x -> not_impl "class_str_item" x ]
;

(* Print dependencies *)

value load_path = ref [""];

value find_in_path path name =
  if not (Filename.is_implicit name) then
    if Sys.file_exists name then name else raise Not_found
  else
    let rec try_dir =
      fun
      [ [] -> raise Not_found
      | [dir :: rem] ->
          let fullname = Filename.concat dir name in
          if Sys.file_exists fullname then fullname else try_dir rem ]
    in
    try_dir path
;

value find_depend modname (byt_deps, opt_deps) =
  let name = String.uncapitalize modname in
  try
    let filename = find_in_path load_path.val (name ^ ".mli") in
    let basename = Filename.chop_suffix filename ".mli" in
    let byt_dep = basename ^ ".cmi" in
    let opt_dep =
      if Sys.file_exists (basename ^ ".ml") then basename ^ ".cmx"
      else basename ^ ".cmi"
    in
    ([byt_dep :: byt_deps], [opt_dep :: opt_deps])
  with
  [ Not_found ->
      try
        let filename = find_in_path load_path.val (name ^ ".ml") in
        let basename = Filename.chop_suffix filename ".ml" in
        ([basename ^ ".cmo" :: byt_deps], [basename ^ ".cmx" :: opt_deps])
      with
      [ Not_found -> (byt_deps, opt_deps) ] ]
;

value (depends_on, escaped_eol) =
  match Sys.os_type with
  [ "Unix" | "Win32" | "Cygwin" -> (": ", "\\\n    ")
  | "MacOS" -> ("\196 ", "\182\n    ")
  | _ -> assert False ]
;

value print_depend target_file deps =
  match deps with
  [ [] -> ()
  | _ ->
      do {
        print_string target_file;
        print_string depends_on;
        let rec print_items pos =
          fun
          [ [] -> print_string "\n"
          | [dep :: rem] ->
              if pos + String.length dep <= 77 then do {
                print_string dep;
                print_string " ";
                print_items (pos + String.length dep + 1) rem
              }
              else do {
                print_string escaped_eol;
                print_string dep;
                print_string " ";
                print_items (String.length dep + 5) rem
              } ]
        in
        print_items (String.length target_file + 2) deps
      } ]
;

(* Main *)

value depend_sig ast =
  do {
    fset.val := StrSet.empty;
    List.iter (fun (si, _) -> sig_item si) ast;
    let basename = Filename.chop_suffix Pcaml.input_file.val ".mli" in
    let (byt_deps, opt_deps) = StrSet.fold find_depend fset.val ([], []) in
    print_depend (basename ^ ".cmi") byt_deps;
  }
;

value depend_str ast =
  do {
    fset.val := StrSet.empty;
    List.iter (fun (si, _) -> str_item si) ast;
    let basename =
      if Filename.check_suffix Pcaml.input_file.val ".ml" then
        Filename.chop_suffix Pcaml.input_file.val ".ml"
      else
        try
          let len = String.rindex Pcaml.input_file.val '.' in
          String.sub Pcaml.input_file.val 0 len
        with
        [ Failure _ | Not_found -> Pcaml.input_file.val ]
    in
    let init_deps =
      if Sys.file_exists (basename ^ ".mli") then
        let cmi_name = basename ^ ".cmi" in ([cmi_name], [cmi_name])
      else ([], [])
    in
    let (byt_deps, opt_deps) = StrSet.fold find_depend fset.val init_deps in
    print_depend (basename ^ ".cmo") byt_deps;
    print_depend (basename ^ ".cmx") opt_deps;
  }
;

Pcaml.print_interf.val := depend_sig;
Pcaml.print_implem.val := depend_str;

Pcaml.add_option "-I"
  (Arg.String (fun dir -> load_path.val := load_path.val @ [dir]))
  "<dir> Add <dir> to the list of include directories.";