src/Pure/Isar/object_logic.ML
author wenzelm
Tue Jul 16 18:41:18 2002 +0200 (2002-07-16)
changeset 13376 59975b8417e2
parent 13334 27149d72bdff
child 14226 7afe0e5bcc83
permissions -rw-r--r--
assert_propT;
     1 (*  Title:      Pure/Isar/object_logic.ML
     2     ID:         $Id$
     3     Author:     Markus Wenzel, TU Muenchen
     4     License:    GPL (GNU GENERAL PUBLIC LICENSE)
     5 
     6 Specifics about common object-logics.
     7 *)
     8 
     9 signature OBJECT_LOGIC =
    10 sig
    11   val add_judgment: bstring * string * mixfix -> theory -> theory
    12   val add_judgment_i: bstring * typ * mixfix -> theory -> theory
    13   val judgment_name: Sign.sg -> string
    14   val is_judgment: Sign.sg -> term -> bool
    15   val drop_judgment: Sign.sg -> term -> term
    16   val fixed_judgment: Sign.sg -> string -> term
    17   val assert_propT: Sign.sg -> term -> term
    18   val declare_atomize: theory attribute
    19   val declare_rulify: theory attribute
    20   val atomize_term: Sign.sg -> term -> term
    21   val atomize_rule: Sign.sg -> cterm -> thm
    22   val atomize_tac: int -> tactic
    23   val full_atomize_tac: int -> tactic
    24   val atomize_goal: int -> thm -> thm
    25   val rulify: thm -> thm
    26   val rulify_no_asm: thm -> thm
    27   val rule_format: 'a attribute
    28   val rule_format_no_asm: 'a attribute
    29   val setup: (theory -> theory) list
    30 end;
    31 
    32 structure ObjectLogic: OBJECT_LOGIC =
    33 struct
    34 
    35 
    36 (** object-logic theory data **)
    37 
    38 (* data kind 'Pure/object-logic' *)
    39 
    40 structure ObjectLogicDataArgs =
    41 struct
    42   val name = "Pure/object-logic";
    43   type T = string option * (thm list * thm list);
    44 
    45   val empty = (None, ([], [Drule.norm_hhf_eq]));
    46   val copy = I;
    47   val prep_ext = I;
    48 
    49   fun merge_judgment (Some x, Some y) =
    50         if x = y then Some x else error "Attempt to merge different object-logics"
    51     | merge_judgment (j1, j2) = if is_some j1 then j1 else j2;
    52 
    53   fun merge ((judgment1, (atomize1, rulify1)), (judgment2, (atomize2, rulify2))) =
    54     (merge_judgment (judgment1, judgment2),
    55       (Drule.merge_rules (atomize1, atomize2), Drule.merge_rules (rulify1, rulify2)));
    56 
    57   fun print _ _ = ();
    58 end;
    59 
    60 structure ObjectLogicData = TheoryDataFun(ObjectLogicDataArgs);
    61 
    62 
    63 (** generic treatment of judgments -- with a single argument only **)
    64 
    65 (* add_judgment(_i) *)
    66 
    67 local
    68 
    69 fun new_judgment name (None, rules) = (Some name, rules)
    70   | new_judgment _ (Some _, _) = error "Attempt to redeclare object-logic judgment";
    71 
    72 fun gen_add_judgment add_consts (name, T, syn) thy =
    73   thy
    74   |> add_consts [(name, T, syn)]
    75   |> ObjectLogicData.map (new_judgment (Sign.full_name (Theory.sign_of thy) name));
    76 
    77 in
    78 
    79 val add_judgment = gen_add_judgment Theory.add_consts;
    80 val add_judgment_i = gen_add_judgment Theory.add_consts_i;
    81 
    82 end;
    83 
    84 
    85 (* term operations *)
    86 
    87 fun judgment_name sg =
    88   (case ObjectLogicData.get_sg sg of
    89     (Some name, _) => name
    90   | _ => raise TERM ("Unknown object-logic judgment", []));
    91 
    92 fun is_judgment sg (Const (c, _) $ _) = c = judgment_name sg
    93   | is_judgment _ _ = false;
    94 
    95 fun drop_judgment sg (Abs (x, T, t)) = Abs (x, T, drop_judgment sg t)
    96   | drop_judgment sg (tm as (Const (c, _) $ t)) =
    97       if (c = judgment_name sg handle TERM _ => false) then t else tm
    98   | drop_judgment _ tm = tm;
    99 
   100 fun fixed_judgment sg x =
   101   let  (*be robust wrt. low-level errors*)
   102     val c = judgment_name sg;
   103     val aT = TFree ("'a", logicS);
   104     val T =
   105       if_none (Sign.const_type sg c) (aT --> propT)
   106       |> Term.map_type_tvar (fn ((x, _), S) => TFree (x, S));
   107     val U = Term.domain_type T handle Match => aT;
   108   in Const (c, T) $ Free (x, U) end;
   109 
   110 fun assert_propT sg t =
   111   let val T = Term.fastype_of t
   112   in if T = propT then t else Const (judgment_name sg, T --> propT) $ t end;
   113 
   114 
   115 
   116 (** treatment of meta-level connectives **)
   117 
   118 (* maintain rules *)
   119 
   120 val get_atomize = #1 o #2 o ObjectLogicData.get_sg;
   121 val get_rulify = #2 o #2 o ObjectLogicData.get_sg;
   122 
   123 val add_atomize = ObjectLogicData.map o Library.apsnd o Library.apfst o Drule.add_rule;
   124 val add_rulify = ObjectLogicData.map o Library.apsnd o Library.apsnd o Drule.add_rule;
   125 
   126 fun declare_atomize (thy, th) = (add_atomize th thy, th);
   127 fun declare_rulify (thy, th) = (add_rulify th thy, th);
   128 
   129 
   130 (* atomize *)
   131 
   132 fun rewrite_prems_tac rews i = PRIMITIVE (MetaSimplifier.fconv_rule
   133   (MetaSimplifier.goals_conv (Library.equal i)
   134     (MetaSimplifier.forall_conv
   135       (MetaSimplifier.goals_conv (K true) (Tactic.rewrite true rews)))));
   136 
   137 fun atomize_term sg =
   138   drop_judgment sg o MetaSimplifier.rewrite_term sg (get_atomize sg) [];
   139 
   140 fun atomize_rule sg = Tactic.rewrite true (get_atomize sg);
   141 
   142 fun atomize_tac i st =
   143   if Logic.has_meta_prems (Thm.prop_of st) i then
   144     (rewrite_prems_tac (get_atomize (Thm.sign_of_thm st)) i) st
   145   else all_tac st;
   146 
   147 fun full_atomize_tac i st =
   148   rewrite_goal_tac (get_atomize (Thm.sign_of_thm st)) i st;
   149 
   150 fun atomize_goal i st =
   151   (case Seq.pull (atomize_tac i st) of None => st | Some (st', _) => st');
   152 
   153 
   154 (* rulify *)
   155 
   156 fun gen_rulify full thm =
   157   Tactic.simplify full (get_rulify (Thm.sign_of_thm thm)) thm
   158   |> Drule.gen_all |> Drule.strip_shyps_warning |> Drule.zero_var_indexes;
   159 
   160 val rulify = gen_rulify true;
   161 val rulify_no_asm = gen_rulify false;
   162 
   163 fun rule_format x = Drule.rule_attribute (fn _ => rulify) x;
   164 fun rule_format_no_asm x = Drule.rule_attribute (fn _ => rulify_no_asm) x;
   165 
   166 
   167 
   168 (** theory setup **)
   169 
   170 val setup = [ObjectLogicData.init];
   171 
   172 
   173 end;