80 lines
2.6 KiB
OCaml
80 lines
2.6 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* Automatique. Distributed only by permission. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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open Terms
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open Equations
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open Orderings
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open Kb
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(****
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let group_rules = [
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{ number = 1; numvars = 1;
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lhs = Term("*", [Term("U",[]); Var 1]); rhs = Var 1 };
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{ number = 2; numvars = 1;
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lhs = Term("*", [Term("I",[Var 1]); Var 1]); rhs = Term("U",[]) };
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{ number = 3; numvars = 3;
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lhs = Term("*", [Term("*", [Var 1; Var 2]); Var 3]);
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rhs = Term("*", [Var 1; Term("*", [Var 2; Var 3])]) }
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]
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****)
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let geom_rules = [
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{ number = 1; numvars = 1;
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lhs = Term ("*",[(Term ("U",[])); (Var 1)]);
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rhs = Var 1 };
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{ number = 2; numvars = 1;
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lhs = Term ("*",[(Term ("I",[(Var 1)])); (Var 1)]);
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rhs = Term ("U",[]) };
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{ number = 3; numvars = 3;
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lhs = Term ("*",[(Term ("*",[(Var 1); (Var 2)])); (Var 3)]);
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rhs = Term ("*",[(Var 1); (Term ("*",[(Var 2); (Var 3)]))]) };
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{ number = 4; numvars = 0;
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lhs = Term ("*",[(Term ("A",[])); (Term ("B",[]))]);
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rhs = Term ("*",[(Term ("B",[])); (Term ("A",[]))]) };
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{ number = 5; numvars = 0;
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lhs = Term ("*",[(Term ("C",[])); (Term ("C",[]))]);
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rhs = Term ("U",[]) };
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{ number = 6; numvars = 0;
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lhs = Term("*",
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[(Term ("C",[]));
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(Term ("*",[(Term ("A",[])); (Term ("I",[(Term ("C",[]))]))]))]);
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rhs = Term ("I",[(Term ("A",[]))]) };
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{ number = 7; numvars = 0;
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lhs = Term("*",
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[(Term ("C",[]));
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(Term ("*",[(Term ("B",[])); (Term ("I",[(Term ("C",[]))]))]))]);
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rhs = Term ("B",[]) }
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]
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let group_rank = function
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"U" -> 0
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| "*" -> 1
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| "I" -> 2
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| "B" -> 3
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| "C" -> 4
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| "A" -> 5
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let group_precedence op1 op2 =
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let r1 = group_rank op1
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and r2 = group_rank op2 in
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if r1 = r2 then Equal else
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if r1 > r2 then Greater else NotGE
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let group_order = rpo group_precedence lex_ext
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let greater pair =
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match group_order pair with Greater -> true | _ -> false
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let _ = kb_complete greater [] geom_rules
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