X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=components%2Fextlib%2FhExtlib.ml;fp=components%2Fextlib%2FhExtlib.ml;h=c2de58f810fe99728b5b13253135c12934e02bec;hp=0000000000000000000000000000000000000000;hb=f61af501fb4608cc4fb062a0864c774e677f0d76;hpb=58ae1809c352e71e7b5530dc41e2bfc834e1aef1

diff --git a/components/extlib/hExtlib.ml b/components/extlib/hExtlib.ml
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+(* Copyright (C) 2005, HELM Team.
+ * 
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ * 
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * HELM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA  02111-1307, USA.
+ * 
+ * For details, see the HELM World-Wide-Web page,
+ * http://cs.unibo.it/helm/.
+ *)
+
+(* $Id$ *)
+
+(** PROFILING *)
+
+let profiling_enabled = ref false ;; (* ComponentsConf.profiling *)
+
+let something_profiled = ref false
+
+let _ = 
+  if !something_profiled then
+    at_exit 
+      (fun _ -> 
+        prerr_endline 
+         (Printf.sprintf "!! %39s ---------- --------- --------- ---------" 
+           (String.make 39 '-'));
+        prerr_endline 
+         (Printf.sprintf "!! %-39s %10s %9s %9s %9s" 
+           "function" "#calls" "total" "max" "average"))
+
+let profiling_printings = ref (fun _ -> true)
+let set_profiling_printings f = profiling_printings := f
+
+type profiler = { profile : 'a 'b. ('a -> 'b) -> 'a -> 'b }
+let profile ?(enable = true) s =
+ if !profiling_enabled && enable then
+   let total = ref 0.0 in
+   let calls = ref 0 in
+   let max = ref 0.0 in
+   let profile f x =
+    if not !profiling_enabled then f x else
+    let before = Unix.gettimeofday () in
+    try
+     incr calls;
+     let res = f x in
+     let after = Unix.gettimeofday () in
+     let delta = after -. before in
+      total := !total +. delta;
+      if delta > !max then max := delta;
+      res
+    with
+     exc ->
+      let after = Unix.gettimeofday () in
+      let delta = after -. before in
+       total := !total +. delta;
+       if delta > !max then max := delta;
+       raise exc
+   in
+   at_exit
+    (fun () ->
+      if !profiling_printings s && !calls <> 0 then
+       begin
+        something_profiled := true;
+        prerr_endline
+         (Printf.sprintf "!! %-39s %10d %9.4f %9.4f %9.4f" 
+         s !calls !total !max (!total /. (float_of_int !calls)))
+       end);
+   { profile = profile }
+ else
+   { profile = fun f x -> f x }
+
+(** {2 Optional values} *)
+
+let map_option f = function None -> None | Some v -> Some (f v)
+let iter_option f = function None -> () | Some v -> f v
+let unopt = function None -> failwith "unopt: None" | Some v -> v
+
+(** {2 String processing} *)
+
+let split ?(sep = ' ') s =
+  let pieces = ref [] in
+  let rec aux idx =
+    match (try Some (String.index_from s idx sep) with Not_found -> None) with
+    | Some pos ->
+        pieces := String.sub s idx (pos - idx) :: !pieces;
+        aux (pos + 1)
+    | None -> pieces := String.sub s idx (String.length s - idx) :: !pieces
+  in
+  aux 0;
+  List.rev !pieces
+
+let trim_blanks s =
+  let rec find_left idx =
+    match s.[idx] with
+    | ' ' | '\t' | '\r' | '\n' -> find_left (idx + 1)
+    | _ -> idx
+  in
+  let rec find_right idx =
+    match s.[idx] with
+    | ' ' | '\t' | '\r' | '\n' -> find_right (idx - 1)
+    | _ -> idx
+  in
+  let s_len = String.length s in
+  let left, right = find_left 0, find_right (s_len - 1) in
+  String.sub s left (right - left + 1)
+
+(** {2 Char processing} *)
+
+let is_alpha c =
+  let code = Char.code c in 
+  (code >= 65 && code <= 90) || (code >= 97 && code <= 122)
+
+let is_digit c =
+  let code = Char.code c in 
+  code >= 48 && code <= 57
+
+let is_blank c =
+  let code = Char.code c in 
+  code = 9 || code = 10 || code = 13 || code = 32
+
+let is_alphanum c = is_alpha c || is_digit c
+
+(** {2 List processing} *)
+
+let flatten_map f l =
+  List.flatten (List.map f l)
+;;
+
+let rec list_uniq ?(eq=(=)) = function 
+  | [] -> []
+  | h::[] -> [h]
+  | h1::h2::tl when eq h1 h2 -> list_uniq ~eq (h2 :: tl) 
+  | h1::tl (* when h1 <> h2 *) -> h1 :: list_uniq ~eq tl
+
+let rec filter_map f =
+  function
+  | [] -> []
+  | hd :: tl ->
+      (match f hd with
+      | None -> filter_map f tl
+      | Some v -> v :: filter_map f tl)
+
+let list_rev_map_filter f l =
+   let rec aux a = function
+      | []       -> a
+      | hd :: tl -> 
+         begin match f hd with
+	    | None   -> aux a tl
+	    | Some b -> aux (b :: a) tl 
+         end
+   in 
+   aux [] l
+
+let list_rev_map_filter_fold f v l =
+   let rec aux v a = function
+      | []       -> v, a
+      | hd :: tl -> 
+         begin match f v hd with
+	    | v, None   -> aux v a tl
+	    | v, Some b -> aux v (b :: a) tl 
+         end
+   in 
+   aux v [] l
+
+let list_concat ?(sep = []) =
+  let rec aux acc =
+    function
+    | [] -> []
+    | [ last ] -> List.flatten (List.rev (last :: acc))
+    | hd :: tl -> aux ([sep; hd] @ acc) tl
+  in
+  aux []
+  
+let rec list_findopt f l = 
+  let rec aux = function 
+    | [] -> None 
+    | x::tl -> 
+        (match f x with
+        | None -> aux tl
+        | Some _ as rc -> rc)
+  in
+  aux l
+
+let split_nth n l =
+  let rec aux acc n l =
+    match n, l with
+    | 0, _ -> List.rev acc, l
+    | n, [] -> raise (Failure "HExtlib.split_nth")
+    | n, hd :: tl -> aux (hd :: acc) (n - 1) tl in
+  aux [] n l
+
+let list_last l =
+  let l = List.rev l in 
+  try List.hd l with exn -> raise (Failure "HExtlib.list_last")
+;;
+  
+(** {2 File predicates} *)
+
+let is_dir fname =
+  try
+    (Unix.stat fname).Unix.st_kind = Unix.S_DIR
+  with Unix.Unix_error _ -> false
+
+let writable_dir path =
+  try
+    let file = path ^ "/prova_matita" in
+    let oc = open_out file in
+    close_out oc;
+    Sys.remove file;
+    true
+  with Sys_error _ -> false
+
+
+let is_regular fname =
+  try
+    (Unix.stat fname).Unix.st_kind = Unix.S_REG
+  with Unix.Unix_error _ -> false
+
+let is_executable fname =
+  try
+    let stat = (Unix.stat fname) in
+    stat.Unix.st_kind = Unix.S_REG &&
+    (stat.Unix.st_perm land 0o001 > 0)
+  with Unix.Unix_error _ -> false
+
+let chmod mode filename =
+   Unix.chmod filename mode
+
+let mkdir path =
+  let components = split ~sep:'/' path in
+  let rec aux where = function
+    | [] -> ()
+    | piece::tl -> 
+        let path =
+          if where = "" then piece else where ^ "/" ^ piece in
+        (try
+          Unix.mkdir path 0o755; chmod 0o2775 path 
+        with 
+        | Unix.Unix_error (Unix.EEXIST,_,_) -> ()
+        | Unix.Unix_error (e,_,_) -> 
+            raise 
+              (Failure 
+                ("Unix.mkdir " ^ path ^ " 0o2775 :" ^ (Unix.error_message e))));
+        aux path tl
+  in
+  let where = if path.[0] = '/' then "/" else "" in
+  aux where components
+
+(** {2 Filesystem} *)
+
+let input_file fname =
+  let size = (Unix.stat fname).Unix.st_size in
+  let buf = Buffer.create size in
+  let ic = open_in fname in
+  Buffer.add_channel buf ic size;
+  close_in ic;
+  Buffer.contents buf
+
+let input_all ic =
+  let size = 10240 in
+  let buf = Buffer.create size in
+  let s = String.create size in
+  (try
+    while true do
+      let bytes = input ic s 0 size in
+      if bytes = 0 then raise End_of_file
+      else Buffer.add_substring buf s 0 bytes
+    done
+  with End_of_file -> ());
+  Buffer.contents buf
+
+let output_file ~filename ~text = 
+  let oc = open_out filename in
+  output_string oc text;
+  close_out oc;
+  chmod 0o664 filename
+
+let blank_split s =
+  let len = String.length s in
+  let buf = Buffer.create 0 in
+  let rec aux acc i =
+    if i >= len
+    then begin
+      if Buffer.length buf > 0
+      then List.rev (Buffer.contents buf :: acc)
+      else List.rev acc
+    end else begin
+      if is_blank s.[i] then
+        if Buffer.length buf > 0 then begin
+          let s = Buffer.contents buf in
+          Buffer.clear buf;
+          aux (s :: acc) (i + 1)
+        end else
+          aux acc (i + 1)
+      else begin
+        Buffer.add_char buf s.[i];
+        aux acc (i + 1)
+      end
+    end
+  in
+  aux [] 0
+
+  (* Rules: * "~name" -> home dir of "name"
+   * "~" -> value of $HOME if defined, home dir of the current user otherwise *)
+let tilde_expand s =
+  let get_home login = (Unix.getpwnam login).Unix.pw_dir in
+  let expand_one s =
+    let len = String.length s in
+    if len > 0 && s.[0] = '~' then begin
+      let login_len = ref 1 in
+      while !login_len < len && is_alphanum (s.[!login_len]) do
+        incr login_len
+      done;
+      let login = String.sub s 1 (!login_len - 1) in
+      try
+        let home =
+          if login = "" then
+            try Sys.getenv "HOME" with Not_found -> get_home (Unix.getlogin ())
+          else
+            get_home login
+        in
+        home ^ String.sub s !login_len (len - !login_len)
+      with Not_found | Invalid_argument _ -> s
+    end else
+      s
+  in
+  String.concat " " (List.map expand_one (blank_split s))
+  
+let find ?(test = fun _ -> true) path = 
+  let rec aux acc todo = 
+    match todo with
+    | [] -> acc
+    | path :: tl ->
+        try
+          let handle = Unix.opendir path in
+          let dirs = ref [] in
+          let matching_files = ref [] in 
+          (try 
+            while true do 
+              match Unix.readdir handle with
+              | "." | ".." -> ()
+              | entry ->
+                  let qentry = path ^ "/" ^ entry in
+                  (try
+                    if is_dir qentry then
+                      dirs := qentry :: !dirs
+                    else if test qentry then
+                      matching_files := qentry :: !matching_files;
+                  with Unix.Unix_error _ -> ())
+            done
+          with End_of_file -> Unix.closedir handle);
+          aux (!matching_files @ acc) (!dirs @ tl)
+        with Unix.Unix_error _ -> aux acc tl
+  in
+  aux [] [path]
+
+let safe_remove fname = if Sys.file_exists fname then Sys.remove fname
+
+let is_dir_empty d =
+ try
+  let od = Unix.opendir d in
+  let rec aux () =
+   let name = Unix.readdir od in
+   if name <> "." && name <> ".." then false else aux () in
+  let res = try aux () with End_of_file -> true in
+   Unix.closedir od;
+   res
+ with
+  Unix.Unix_error _ -> true (* raised by Unix.opendir, we hope :-) *)
+
+let safe_rmdir d = try Unix.rmdir d with Unix.Unix_error _ -> ()
+
+let rec rmdir_descend d = 
+  if is_dir_empty d then
+    begin
+      safe_rmdir d;
+      rmdir_descend (Filename.dirname d)
+    end
+
+
+(** {2 Exception handling} *)
+
+let finally at_end f arg =
+  let res =
+    try f arg
+    with exn -> at_end (); raise exn
+  in
+  at_end ();
+  res
+
+(** {2 Localized exceptions } *)
+
+exception Localized of Stdpp.location * exn
+
+let loc_of_floc floc = Stdpp.first_pos floc, Stdpp.last_pos floc;;
+
+let floc_of_loc (loc_begin, loc_end) =
+ Stdpp.make_loc (loc_begin, loc_end)
+
+let dummy_floc = floc_of_loc (-1, -1)
+
+let raise_localized_exception ~offset floc exn =
+ let x, y = loc_of_floc floc in
+ let x = offset + x in
+ let y = offset + y in
+ let floc = floc_of_loc (x,y) in
+  raise (Localized (floc, exn))
+
+let estimate_size x = 
+  4 * (String.length (Marshal.to_string x [])) / 1024
+
+let normalize_path s = 
+  let s = Str.global_replace (Str.regexp "//") "/" s in
+  let l = Str.split (Str.regexp "/") s in
+  let rec aux acc = function
+    | [] -> acc
+    | he::"."::tl -> aux acc (he::tl)
+    | he::".."::tl when he <> ".." -> aux [] (acc @ tl)
+    | he::tl -> aux (acc@[he]) tl
+  in
+  (if Str.string_match (Str.regexp "^/") s 0 then "/" else "") ^
+  String.concat "/" (aux [] l)
+  ^ (if Str.string_match (Str.regexp "/$") s 0 then "/" else "")
+;;
+
+let find_in paths path =
+   let rec aux = function
+   | [] -> raise (Failure "find_in")
+   | p :: tl ->
+      let path = normalize_path (p ^ "/" ^ path) in
+       try
+         if (Unix.stat path).Unix.st_kind = Unix.S_REG then path
+         else aux tl
+       with Unix.Unix_error _ -> 
+               aux tl
+   in
+   try
+     aux paths
+   with Unix.Unix_error _ | Failure _ -> 
+     raise 
+       (Failure "find_in")
+;;
+
+let is_prefix_of_aux d1 d2 = 
+  let len1 = String.length d1 in
+  let len2 = String.length d2 in
+  if len2 < len1 then 
+    false, len1, len2
+  else
+    let pref = String.sub d2 0 len1 in
+    pref = d1 && (len1 = len2 || d1.[len1-1] = '/' || d2.[len1] = '/'), len1, len2
+
+let is_prefix_of d1 d2 =
+  let b,_,_ = is_prefix_of_aux d1 d2 in b
+;;
+
+let chop_prefix prefix s =
+  let b,lp,ls = is_prefix_of_aux prefix s in
+  if b then
+    String.sub s lp (ls - lp)
+  else 
+    s
+;;
+
+let touch s =
+  try close_out(open_out s) with Sys_error _ -> ()
+;;