X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fcomponents%2Fbinaries%2Fmatex%2Fground.ml;h=7eebedb7d13e8fa810c4dc0eb867aa038362e474;hb=05b047be6817f430c8c72fd9b0902df8bb9f579e;hp=022ab63f2466be39c1c41c874138d636a4137ab6;hpb=ea6b4322051d3eb1794bfca3928f6e1773f971ba;p=helm.git

diff --git a/matita/components/binaries/matex/ground.ml b/matita/components/binaries/matex/ground.ml
index 022ab63f2..7eebedb7d 100644
--- a/matita/components/binaries/matex/ground.ml
+++ b/matita/components/binaries/matex/ground.ml
@@ -17,16 +17,20 @@ exception Error of string
 
 (* interface functions ******************************************************)
 
+let id x = x
+
+let id2 x y = x, y 
+
 let rec segments_of_string ss l s =
    match try Some (S.index s '/') with Not_found -> None with
       | None   -> s :: ss
       | Some i -> segments_of_string (S.sub s 0 i :: ss) (l-i-1) (S.sub s (i+1) (l-i-1))
 
-let rec rev_concat sep r = function
+let rec rev_map_concat map sep r = function
    | []                  -> r 
    | s :: ss             ->
-      if r = "" then rev_concat sep s ss else
-      rev_concat sep (s ^ sep ^ r) ss 
+      if r = "" then rev_map_concat map sep (map s) ss else
+      rev_map_concat map sep (map s ^ sep ^ r) ss 
 
 let fold_string map a s =
    let l = S.length s in
@@ -44,10 +48,21 @@ let rec foldi_left mapi i a = function
    | []       -> a
    | hd :: tl -> foldi_left mapi (succ i) (mapi i a hd) tl
 
+let rec rev_mapi mapi i l =
+   let map i a hd = mapi i hd :: a in
+   foldi_left map i [] l
+
 let rec rev_map_append map l r = match l with
    | []       -> r
    | hd :: tl -> rev_map_append map tl (map hd :: r)
 
+let rec split_at x = function
+   | l when x <= 0 -> [], l
+   | []       -> [], []
+   | hd :: tl -> 
+      let l1, l2 = split_at (pred x) tl in
+      hd :: l1, l2
+
 let error s = raise (Error s)
 
-let log s = P.eprintf "MaTeX: %s\n" s
+let log s = P.eprintf "MaTeX: %s\n%!" s