From 49959160408fc4c9629985bd691f7c76523d849d Mon Sep 17 00:00:00 2001
From: Enrico Tassi <enrico.tassi@inria.fr>
Date: Fri, 17 Jun 2005 14:58:02 +0000
Subject: [PATCH] concrete syntax for goal patterns

---
 .../cic_disambiguation/cicTextualParser2.ml   | 41 +++++++++++--------
 1 file changed, 24 insertions(+), 17 deletions(-)

diff --git a/helm/ocaml/cic_disambiguation/cicTextualParser2.ml b/helm/ocaml/cic_disambiguation/cicTextualParser2.ml
index b223eb3fd..a1fcc9205 100644
--- a/helm/ocaml/cic_disambiguation/cicTextualParser2.ml
+++ b/helm/ocaml/cic_disambiguation/cicTextualParser2.ml
@@ -328,6 +328,23 @@ EXTEND
     | [ IDENT "whd" ] -> `Whd 
     | [ IDENT "normalize" ] -> `Normalize ]
   ];
+  pattern_spec: [
+    [ hyp_paths =
+      OPT [
+        paths = LIST1 [ id = IDENT ; SYMBOL ":" ; path = term -> (id,path) ]
+          SEP SYMBOL ";";
+        SYMBOL <:unicode<vdash>> ->
+          paths ];
+      goal_path = OPT term ->
+        let hyp_paths = match hyp_paths with None -> [] | Some l -> l in
+        (hyp_paths, goal_path) ]
+  ];
+  direction: [
+    [ IDENT "left" -> `Left
+    | SYMBOL ">" -> `Left
+    | IDENT "right" -> `Right
+    | SYMBOL "<" -> `Right ]
+  ];
   tactic: [
     [ [ IDENT "absurd" ]; t = tactic_term ->
         TacticAst.Absurd (loc, t)
@@ -383,28 +400,18 @@ EXTEND
        where = IDENT ; SYMBOL <:unicode<def>> ; t = tactic_term ->
         TacticAst.LetIn (loc, t, where)
     | kind = reduction_kind;
-      pat = OPT [
-        "in"; pat = [ IDENT "goal" -> `Goal | IDENT "hyp" -> `Everywhere ] ->
-          pat
-      ];
-      terms = LIST0 term SEP SYMBOL "," ->
-        (match (pat, terms) with
-        | None, [] -> TacticAst.Reduce (loc, kind, None)
-        | None, terms -> TacticAst.Reduce (loc, kind, Some (terms, `Goal))
-        | Some pat, [] -> fail loc "Missing term [list]"
-        | Some pat, terms -> TacticAst.Reduce (loc, kind, Some (terms, pat)))
-    | kind = reduction_kind; where = IDENT ; IDENT "at" ; pat = term ->
-        TacticAst.ReduceAt (loc, kind, where, pat)
+      p = OPT [ "in" ; p = pattern_spec -> p ] ->
+        let p = match p with None -> [], None | Some p -> p in
+        TacticAst.Reduce (loc, kind, p)
     | [ IDENT "reflexivity" ] ->
         TacticAst.Reflexivity loc
     | [ IDENT "replace" ];
       t1 = tactic_term; "with"; t2 = tactic_term ->
         TacticAst.Replace (loc, t1, t2)
-    | [ IDENT "rewrite" ; IDENT "left" ] ; t = term ->
-        TacticAst.Rewrite (loc,`Left, t, None)
-    | [ IDENT "rewrite" ; IDENT "right" ] ; t = term ->
-        TacticAst.Rewrite (loc,`Right, t, None)
-    (* TODO Replace_pattern *)
+    | IDENT "rewrite" ; d = direction; t = term ;
+      p = OPT [ "in"; p = pattern_spec -> p ] ->
+        let p = match p with None -> [], None | Some p -> p in
+        TacticAst.Rewrite (loc, d, t, p)
     | [ IDENT "right" ] -> TacticAst.Right loc
     | [ IDENT "ring" ] -> TacticAst.Ring loc
     | [ IDENT "split" ] -> TacticAst.Split loc
-- 
2.39.2