xml contribution created.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@756 85f007b7-540e-0410-9357-904b9bb8a0f7

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+(******************************************************************************)
+(*                                                                            *)
+(*                               PROJECT HELM                                 *)
+(*                                                                            *)
+(*                     A tactic to print Coq objects in XML                   *)
+(*                                                                            *)
+(*                Claudio Sacerdoti Coen <sacerdot@cs.unibo.it>               *)
+(*                                 18/10/2000                                 *)
+(*                                                                            *)
+(* This module defines a pretty-printer and the stream of commands to the pp  *)
+(*                                                                            *)
+(******************************************************************************)
+
+
+(* the type token for XML cdata, empty elements and not-empty elements *)
+(* Usage:                                                                *)
+(*  Str cdata                                                            *)
+(*  Empty (element_name, [attrname1, value1 ; ... ; attrnamen, valuen]   *)
+(*  NEmpty (element_name, [attrname1, value2 ; ... ; attrnamen, valuen], *)
+(*          content                                                      *)
+type token = Str of string
+           | Empty of string * (string * string) list
+	   | NEmpty of string * (string * string) list * token Stream.t
+;;
+
+(* currified versions of the constructors make the code more readable *)
+let xml_empty name attrs = [< 'Empty(name,attrs) >]
+let xml_nempty name attrs content = [< 'NEmpty(name,attrs,content) >]
+let xml_cdata str = [< 'Str str >]
+
+(* Usage:                                                                   *)
+(*  pp tokens None     pretty prints the output on stdout                   *)
+(*  pp tokens (Some filename) pretty prints the output on the file filename *)
+let pp strm fn =
+ let channel = ref stdout in
+ let rec pp_r m =
+  parser
+    [< 'Str a ; s >] ->
+      print_spaces m ;
+      fprint_string (a ^ "\n") ;
+      pp_r m s
+  | [< 'Empty(n,l) ; s >] ->
+      print_spaces m ;
+      fprint_string ("<" ^ n) ;
+      List.iter (function (n,v) -> fprint_string (" " ^ n ^ "=\"" ^ v ^ "\"")) l;
+      fprint_string "/>\n" ;
+      pp_r m s
+  | [< 'NEmpty(n,l,c) ; s >] ->
+      print_spaces m ;
+      fprint_string ("<" ^ n) ;
+      List.iter (function (n,v) -> fprint_string (" " ^ n ^ "=\"" ^ v ^ "\"")) l;
+      fprint_string ">\n" ;
+      pp_r (m+1) c ;
+      print_spaces m ;
+      fprint_string ("</" ^ n ^ ">\n") ;
+      pp_r m s
+  | [< >] -> ()
+ and print_spaces m =
+  for i = 1 to m do fprint_string "  " done
+ and fprint_string str =
+  output_string !channel str
+ in
+  match fn with
+     Some filename ->
+       channel := open_out filename ;
+       pp_r 0 strm ;
+       close_out !channel ;
+       print_string ("\nWriting on file \"" ^ filename ^ "\" was succesfull\n");
+       flush stdout
+   | None ->
+       pp_r 0 strm
+;;