+let get_rule g (r : n_symbol) : rhs =
+ Node.of_int (g.rules.((Node.to_int r) - g.rules_offset))
+
+let get_id1 (r : rhs) : tn_symbol =
+ Node.of_int(((Node.to_int r) lsr 3) land 0x7ffffff)
+
+let get_id2 (r : rhs) : tn_symbol =
+ Node.of_int((Node.to_int r) lsr 30)
+
+type conf = | C0 (* B(C) *)
+ | C1 (* B(C(y0)) *)
+ | C2 (* B(C, y0) *)
+ | C3 (* B(y0, C) *)
+ | C4 (* B(C(y0, y1)) *)
+ | C5 (* B(C(y0), y1) *)
+ | C6 (* B(y0, C(y1)) *)
+
+let get_conf (r : rhs) : conf =
+ (Obj.magic ((Node.to_int r) land 0b111))
+
+
+let get_rank (r : rhs) : int =
+ match get_conf r with
+ | C0 -> 0
+ | C1 | C2 | C3 -> 1
+ | C4 | C5 | C6 -> 2
+
+let get_id1_rank (r : rhs) : int =
+ match get_conf r with
+ | C0 | C1 | C4 -> 1
+ | _ -> 2
+
+let get_id2_pos (r : rhs) : int =
+ match get_conf r with
+ | C0 | C1 |C2 | C4 | C5 -> 1
+ | _ -> 2
+
+let get_id2_rank (r : rhs) : int =
+ match get_conf r with
+ | C0 | C2 | C3 -> 0
+ | C1 | C5 | C6 -> 1
+ | C4 -> 2
+
+let is_attribute g tag =
+ tag > 4 && (to_string g tag).[0] == '2'
+
+let dummy_param : 'a partial = Leaf (~-1,~-1, [||], Node.nil)
+
+(*
+let rec start_skip g idx count =
+ if idx < Node.null then count else
+ let symbol = start_tag g idx in
+ if is_terminal g symbol then
+ let symbol = terminal symbol in
+ if symbol == nil_symbol then count else
+ let count = count+1 in
+ let fs = start_first_child g idx in
+ let countl = start_skip g fs count in
+ start_skip g fs countl
+ else
+ let nt = non_terminal symbol in
+ let rhs = get_rule g nt in
+ let nparam = get_rank rhs in
+ match nparam with
+ | 0 -> rule_skip g nt dummy_param dummy_param count
+ | 1 -> rule_skip g nt (Leaf(0,StateSet.empty, Node.nil,start_first_child g idx)) dummy_param count
+ | 2 ->
+ let fc = start_first_child g idx in
+ let ns = start_next_sibling g fc in
+ rule_skip g nt (Leaf (0,[||],fc)) (Leaf (1,[||],ns)) count
+ | _ -> assert false
+
+and rule_skip g t y0 y1 count =
+ let rhs = get_rule g t in
+ let id1 = get_id1 rhs in
+ let id2 = get_id2 rhs in
+ let conf = get_conf rhs in
+ if is_non_terminal g id1 then
+ let id1 = non_terminal id1 in
+ match conf with
+ | C0 ->rule_skip g id1 (Node0 id2) dummy_param count
+ | C1 -> rule_skip g id1 (Node1(id2,y0)) dummy_param count
+ | C2 -> rule_skip g id1 (Node0 id2) y0 count
+ | C3 -> rule_skip g id1 y0 (Node0 id2) count
+ | C4 -> rule_skip g id1 (Node2(id2, y0, y1)) dummy_param count
+ | C5 -> rule_skip g id1 (Node1(id2, y0)) y1 count
+ | C6 -> rule_skip g id1 y0 (Node1(id2, y1)) count
+ else
+ let id1 = terminal id1 in
+ match conf with
+ | C0 | C1 -> assert false
+ | C2 -> terminal_skip g id1 (Node0 id2) y0 count
+ | C3 -> terminal_skip g id1 y0 (Node0 id2) count
+ | C4 -> assert false
+ | C5 -> terminal_skip g id1 (Node1(id2, y0)) y1 count
+ | C6 -> terminal_skip g id1 y0 (Node1(id2, y1)) count
+
+and terminal_skip g (symbol : t_symbol) y0 y1 count =
+ if symbol == nil_symbol then count else
+ let count = count + 1 in
+ let countl = partial_skip g y0 count in
+ partial_skip g y1 countl
+
+and partial_skip g l count =
+ match l with
+ | Cache _ -> assert false
+ | Leaf (_,_,_, id) -> start_skip g id count
+ | Node0 id ->
+ if (terminal id) == nil_symbol then count
+ else
+ rule_skip g (non_terminal id) dummy_param dummy_param count
+
+ | Node1 (id, y0) ->
+ rule_skip g (non_terminal id) y0 dummy_param count
+
+ | Node2 (id, y0, y1) ->
+
+ if is_terminal g id then
+ terminal_skip g (terminal id) y0 y1 count
+ else
+ rule_skip g (non_terminal id) y0 y1 count
+
+
+let dispatch_param0 conf id2 y0 y1 =
+ match conf with
+ | C0 -> Node0 id2
+ | C1 -> Node1(id2,y0)
+ | C2 -> Node0 id2
+ | C3 -> Node0 id2
+ | C4 -> Node2(id2, y0, y1)
+ | C5 -> Node1(id2, y0)
+ | C6 -> y0
+
+let dispatch_param1 conf id2 y0 y1 =
+ match conf with
+ | C0 -> dummy_param
+ | C1 -> dummy_param
+ | C2 -> y0
+ | C3 -> Node0 id2
+ | C4 -> dummy_param
+ | C5 -> y1
+ | C6 -> Node1(id2, y1)
+
+*)