From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Fri, 13 Oct 2006 16:57:10 +0000 (+0000)
Subject: Content level representation of LetRec changed.
X-Git-Tag: 0.4.95@7852~891
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=f084490a318c45b1a4090a85119f54c463aec063;p=helm.git

Content level representation of LetRec changed.
---

diff --git a/components/content_pres/cicNotationParser.ml b/components/content_pres/cicNotationParser.ml
index 7aa4efe17..088d1b69d 100644
--- a/components/content_pres/cicNotationParser.ml
+++ b/components/content_pres/cicNotationParser.ml
@@ -46,6 +46,7 @@ let level1_pattern =
 let level2_ast = Grammar.Entry.create level2_ast_grammar "level2_ast"
 let term = Grammar.Entry.create level2_ast_grammar "term"
 let let_defs = Grammar.Entry.create level2_ast_grammar "let_defs"
+let protected_binder_vars = Grammar.Entry.create level2_ast_grammar "protected_binder_vars"
 let level2_meta = Grammar.Entry.create level2_meta_grammar "level2_meta"
 
 let int_of_string s =
@@ -420,7 +421,7 @@ END
 
 (* {{{ Grammar for ast patterns, notation level 2 *)
 EXTEND
-  GLOBAL: level2_ast term let_defs;
+  GLOBAL: level2_ast term let_defs protected_binder_vars;
   level2_ast: [ [ p = term -> p ] ];
   sort: [
     [ "Prop" -> `Prop
@@ -502,12 +503,6 @@ EXTEND
         index_name = OPT [ "on"; id = single_arg -> id ];
         ty = OPT [ SYMBOL ":" ; p = term -> p ];
         SYMBOL <:unicode<def>> (* ≝ *); body = term ->
-          let body = fold_binder `Lambda args body in
-          let ty = 
-            match ty with 
-            | None -> None
-            | Some ty -> Some (fold_binder `Pi args ty)
-          in
           let rec position_of name p = function 
             | [] -> None, p
             | n :: _ when n = name -> Some p, p
@@ -527,7 +522,13 @@ EXTEND
             | None -> 0 
             | Some index_name -> find_arg index_name 0 args
           in
-          (name, ty), body, index
+          let args =
+           List.concat
+            (List.map
+             (function (names,ty) -> List.map (function x -> x,ty) names
+             ) args)
+          in
+           args, (name, ty), body, index
       ] SEP "and" ->
         defs
     ]
@@ -537,12 +538,15 @@ EXTEND
           l = LIST1 single_arg SEP SYMBOL "," -> l
         | SYMBOL "_" -> [Ast.Ident ("_", None)] ];
       typ = OPT [ SYMBOL ":"; t = term -> t ] -> (vars, typ)
-    | LPAREN; 
-        vars = [
-            l =  LIST1 single_arg SEP SYMBOL "," -> l
-          | SYMBOL "_" -> [Ast.Ident ("_", None)] ];
-      typ = OPT [ SYMBOL ":"; t = term -> t ]; 
-      RPAREN -> (vars, typ)
+    ]
+  ];
+  protected_binder_vars: [
+    [ LPAREN; vars = binder_vars; RPAREN -> vars 
+    ]
+  ];
+  maybe_protected_binder_vars: [
+    [ vars = binder_vars -> vars
+    | vars = protected_binder_vars -> vars
     ]
   ];
   term: LEVEL "10N" [ (* let in *)
@@ -556,10 +560,10 @@ EXTEND
   ];
   term: LEVEL "20R"  (* binder *)
     [
-      [ b = binder; (vars, typ) = binder_vars; SYMBOL "."; body = term ->
+      [ b = binder; (vars, typ) = maybe_protected_binder_vars; SYMBOL "."; body = term ->
           return_term loc (fold_cluster b vars typ body)
       | SYMBOL <:unicode<exists>> (* ∃ *);
-        (vars, typ) = binder_vars; SYMBOL "."; body = term ->
+        (vars, typ) = maybe_protected_binder_vars; SYMBOL "."; body = term ->
           return_term loc (fold_exists vars typ body)
       ]
     ];
diff --git a/components/content_pres/cicNotationParser.mli b/components/content_pres/cicNotationParser.mli
index 978daf9ff..53182dc31 100644
--- a/components/content_pres/cicNotationParser.mli
+++ b/components/content_pres/cicNotationParser.mli
@@ -56,9 +56,12 @@ val level2_ast_grammar: Grammar.g
 val term : CicNotationPt.term Grammar.Entry.e
 
 val let_defs :
-  (CicNotationPt.capture_variable * CicNotationPt.term * int) list
+  (CicNotationPt.capture_variable list * CicNotationPt.capture_variable * CicNotationPt.term * int) list
     Grammar.Entry.e
 
+val protected_binder_vars :
+  (CicNotationPt.term list * CicNotationPt.term option) Grammar.Entry.e
+
 val parse_term: Ulexing.lexbuf -> CicNotationPt.term
 
 (** {2 Debugging} *)