From 55b6884dda47f773156fa2484e927430c53b4e05 Mon Sep 17 00:00:00 2001
From: herbelin
Date: Tue, 31 Jan 2006 10:43:51 +0000
Subject: Ajout de fichiers d'interprétation de la syntaxe primitive pour
 string et char

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@7966 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 parsing/g_string_syntax.ml | 60 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 parsing/g_string_syntax.ml

(limited to 'parsing/g_string_syntax.ml')

diff --git a/parsing/g_string_syntax.ml b/parsing/g_string_syntax.ml
new file mode 100644
index 0000000000..d4d83f6d27
--- /dev/null
+++ b/parsing/g_string_syntax.ml
@@ -0,0 +1,60 @@
+(***********************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team    *)
+(* <O___,, *        INRIA-Rocquencourt  &  LRI-CNRS-Orsay              *)
+(*   \VV/  *************************************************************)
+(*    //   *      This file is distributed under the terms of the      *)
+(*         *       GNU Lesser General Public License Version 2.1       *)
+(***********************************************************************)
+
+open Pp
+open Util
+open Names
+open Pcoq
+open Libnames
+open Topconstr
+open G_ascii_syntax
+open Rawterm
+
+exception Non_closed_string
+
+(* make a string term from the string s *)
+
+let string_module = make_dir ["Coq";"Strings";"String"]
+let string_path = make_path string_module (id_of_string "string")
+
+let glob_string  = IndRef (string_path,0)
+let path_of_EmptyString  = ((string_path,0),1)
+let glob_EmptyString  = ConstructRef path_of_EmptyString
+let path_of_String  = ((string_path,0),2)
+let glob_String  = ConstructRef path_of_String
+
+let interp_string dloc s =
+  let le = String.length s in
+  let rec aux n = 
+     if n = le then RRef (dloc, glob_EmptyString) else
+     RApp (dloc,RRef (dloc, glob_String),
+       [interp_ascii dloc (int_of_char s.[n]); aux (n+1)])
+  in aux 0
+
+let uninterp_string r =
+  try 
+    let b = Buffer.create 16 in
+    let rec aux = function
+    | RApp (_,RRef (_,k),[a;s]) when k = glob_String ->
+	(match uninterp_ascii a with
+	  | Some c -> Buffer.add_char b (Char.chr c); aux s
+	  | _ -> raise Non_closed_string)
+    | RRef (_,z) when z = glob_EmptyString ->
+	Some (Buffer.contents b)
+    | _ ->
+	raise Non_closed_string
+    in aux r
+  with 
+   Non_closed_string -> None
+
+let _ =
+  Notation.declare_string_interpreter "string_scope"
+    (glob_string,["Coq";"Strings";"String"])
+    interp_string
+    ([RRef (dummy_loc,glob_String); RRef (dummy_loc,glob_EmptyString)],
+     uninterp_string, true)
-- 
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