Rewrite the AST to conform to the W3C grammar

[tatoo.git] / src / formula.ml

diff --git a/src/formula.ml b/src/formula.ml
index 1dd0f14..14fd76f 100644 (file)
--- a/src/formula.ml
+++ b/src/formula.ml
@@ -21,8 +21,7 @@ type 'formula expr =
   | True
   | Or of 'formula * 'formula
   | And of 'formula * 'formula
-  | Move of (move * bool * State.t)
-  | Label of QNameSet.t
+  | Move of move * bool * State.t
 
 type 'hcons node = {
   pos : 'hcons expr;
@@ -43,7 +42,6 @@ module rec Node : Hcons.S
       | Or(xf1, xf2), Or(yf1, yf2)
       | And(xf1, xf2), And(yf1,yf2)  -> (xf1 == yf1) && (xf2 == yf2)
       | Move(d1, p1, s1), Move(d2 ,p2 ,s2) -> d1 == d2 && p1 == p2 && s1 == s2
-      | Label s1, Label s2 -> s1 == s2
       | _ -> false
 
     let hash f =
@@ -56,22 +54,19 @@ module rec Node : Hcons.S
         HASHINT3(PRIME3, Uid.to_int f1.Node.id, Uid.to_int f2.Node.id)
 
       | Move(d, p, s) -> HASHINT4(PRIME5, hash_const_variant d,vb p,s)
-      | Label s -> HASHINT2(PRIME7, Uid.to_int s.QNameSet.id)
   end
 
 type t = Node.t
-let hash x = x.Node.key
+let hash x = x.Node.hash
 let uid x = x.Node.id
 let equal = Node.equal
 let expr f = f.Node.node.pos
-(*let st f = f.Node.node.st*)
-(*let size f = f.Node.node.size*)
+
 let compare f1 f2 = compare f1.Node.id  f2.Node.id
 let prio f =
   match expr f with
     | True | False -> 10
     | Move _ -> 8
-    | Label _ -> 7
     | And _ -> 6
     | Or _ -> 1
 
@@ -88,7 +83,6 @@ let rec print ?(parent=false) ppf f =
       (print ppf f1);
       fprintf ppf " %s " Pretty.vee;
       (print ppf f2);
-    | Label s -> fprintf ppf "%a" QNameSet.print s
     | Move(dir, b, s) ->
       let _ = flush_str_formatter() in
       let fmt = str_formatter in
@@ -96,6 +90,9 @@ let rec print ?(parent=false) ppf f =
           match  dir with
           | `Left ->  Pretty.down_arrow, Pretty.subscript 1
           | `Right -> Pretty.down_arrow, Pretty.subscript 2
+          | `Epsilon -> Pretty.epsilon, ""
+          | `Up1 -> Pretty.up_arrow, Pretty.subscript 1
+          | `Up2 -> Pretty.up_arrow, Pretty.subscript 2
         in
         fprintf fmt "%s%s" a_str d_str;
         State.print fmt s;
@@ -111,36 +108,20 @@ let is_true f = (expr f) == True
 let is_false f = (expr f) == False
 
 
-let cons pos neg s1 s2 size1 size2 =
-  let nnode = Node.make { pos = neg; neg = (Obj.magic 0); st = s2; size = size2 } in
-  let pnode = Node.make { pos = pos; neg = nnode ; st = s1; size = size1 } in
+let cons pos neg =
+  let nnode = Node.make { pos = neg; neg = (Obj.magic 0); } in
+  let pnode = Node.make { pos = pos; neg = nnode } in
     (Node.node nnode).neg <- pnode; (* works because the neg field isn't taken into
                                        account for hashing ! *)
     pnode,nnode
 
 
-let empty_pair = StateSet.empty, StateSet.empty
-let true_,false_ = cons True False empty_pair empty_pair 0 0
+let true_,false_ = cons True False
 let atom_ d p s =
-  let si = StateSet.singleton s in
-  let ss = match d with
-    | `Left -> si, StateSet.empty
-    | `Right -> StateSet.empty, si
-  in fst (cons (Atom(d,p,s)) (Atom(d,not p,s)) ss ss 1 1)
+  fst (cons (Move(d,p,s)) (Move(d,not p,s)))
 
 let not_ f = f.Node.node.neg
 
-let union_pair (l1,r1) (l2, r2) =
-  StateSet.union l1 l2,
-  StateSet.union r1 r2
-
-let merge_states f1 f2 =
-  let sp =
-    union_pair (st f1) (st f2)
-  and sn =
-    union_pair (st (not_ f1)) (st (not_ f2))
-  in
-    sp,sn
 
 let order f1 f2 = if uid f1  < uid f2 then f2,f1 else f1,f2
 
@@ -159,10 +140,7 @@ let or_ f1 f2 =
   (* commutativity of | *)
   else
     let f1, f2 = order f1 f2 in
-    let psize = (size f1) + (size f2) in
-    let nsize = (size (not_ f1)) + (size (not_ f2)) in
-    let sp, sn = merge_states f1 f2 in
-      fst (cons (Or(f1,f2)) (And(not_ f1, not_ f2)) sp sn psize nsize)
+      fst (cons (Or(f1,f2)) (And(not_ f1, not_ f2)))
 
 
 let and_ f1 f2 =
@@ -171,12 +149,3 @@ let and_ f1 f2 =
 
 let of_bool = function true -> true_ | false -> false_
 
-
-module Infix = struct
-  let ( +| ) f1 f2 = or_ f1 f2
-
-  let ( *& ) f1 f2 = and_ f1 f2
-
-  let ( *+ ) d s = atom_ d true s
-  let ( *- ) d s = atom_ d false s
-end