src/HOL/Tools/primrec_package.ML
author wenzelm
Tue, 07 Feb 2006 19:56:45 +0100
changeset 18964 67f572e03236
parent 18928 042608ffa2ec
child 19046 bc5c6c9b114e
permissions -rw-r--r--
renamed gen_duplicates to duplicates;
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
5719
2aed60cdb9f2 Changed interface.
berghofe
parents: 5553
diff changeset
     1
(*  Title:      HOL/Tools/primrec_package.ML
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
     2
    ID:         $Id$
11539
0f17da240450 tuned headers;
wenzelm
parents: 10525
diff changeset
     3
    Author:     Stefan Berghofer, TU Muenchen and Norbert Voelker, FernUni Hagen
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
     4
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
     5
Package for defining functions on datatypes by primitive recursion.
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
     6
*)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
     7
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
     8
signature PRIMREC_PACKAGE =
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
     9
sig
6427
fd36b2e7d80e tuned messages;
wenzelm
parents: 6425
diff changeset
    10
  val quiet_mode: bool ref
15703
727ef1b8b3ee *** empty log message ***
wenzelm
parents: 15574
diff changeset
    11
  val add_primrec: string -> ((bstring * string) * Attrib.src list) list
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
    12
    -> theory -> theory * thm list
18728
6790126ab5f6 simplified type attribute;
wenzelm
parents: 18688
diff changeset
    13
  val add_primrec_i: string -> ((bstring * term) * attribute list) list
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
    14
    -> theory -> theory * thm list
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    15
end;
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    16
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    17
structure PrimrecPackage : PRIMREC_PACKAGE =
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    18
struct
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    19
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    20
open DatatypeAux;
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    21
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    22
exception RecError of string;
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    23
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    24
fun primrec_err s = error ("Primrec definition error:\n" ^ s);
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    25
fun primrec_eq_err sign s eq =
7544
dee529666dcd Fixed bug in add_primrec which caused non-informative error message.
berghofe
parents: 7152
diff changeset
    26
  primrec_err (s ^ "\nin\n" ^ quote (Sign.string_of_term sign eq));
6427
fd36b2e7d80e tuned messages;
wenzelm
parents: 6425
diff changeset
    27
fd36b2e7d80e tuned messages;
wenzelm
parents: 6425
diff changeset
    28
fd36b2e7d80e tuned messages;
wenzelm
parents: 6425
diff changeset
    29
(* messages *)
fd36b2e7d80e tuned messages;
wenzelm
parents: 6425
diff changeset
    30
fd36b2e7d80e tuned messages;
wenzelm
parents: 6425
diff changeset
    31
val quiet_mode = ref false;
fd36b2e7d80e tuned messages;
wenzelm
parents: 6425
diff changeset
    32
fun message s = if ! quiet_mode then () else writeln s;
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    33
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
    34
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    35
(* preprocessing of equations *)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    36
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    37
fun process_eqn sign (eq, rec_fns) = 
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    38
  let
6032
c4e62bab69bd moved dest_eq to hologic.ML and tidied
paulson
parents: 5891
diff changeset
    39
    val (lhs, rhs) = 
c4e62bab69bd moved dest_eq to hologic.ML and tidied
paulson
parents: 5891
diff changeset
    40
	if null (term_vars eq) then
c4e62bab69bd moved dest_eq to hologic.ML and tidied
paulson
parents: 5891
diff changeset
    41
	    HOLogic.dest_eq (HOLogic.dest_Trueprop eq)
7016
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
    42
	      handle TERM _ => raise RecError "not a proper equation"
6032
c4e62bab69bd moved dest_eq to hologic.ML and tidied
paulson
parents: 5891
diff changeset
    43
	else raise RecError "illegal schematic variable(s)";
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    44
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    45
    val (recfun, args) = strip_comb lhs;
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
    46
    val fnameT = dest_Const recfun handle TERM _ => 
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    47
      raise RecError "function is not declared as constant in theory";
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    48
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    49
    val (ls', rest)  = take_prefix is_Free args;
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    50
    val (middle, rs') = take_suffix is_Free rest;
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    51
    val rpos = length ls';
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    52
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    53
    val (constr, cargs') = if null middle then raise RecError "constructor missing"
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    54
      else strip_comb (hd middle);
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    55
    val (cname, T) = dest_Const constr
7016
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
    56
      handle TERM _ => raise RecError "ill-formed constructor";
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
    57
    val (tname, _) = dest_Type (body_type T) handle TYPE _ =>
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    58
      raise RecError "cannot determine datatype associated with function"
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    59
6037
b0895662fba4 better indentation
paulson
parents: 6032
diff changeset
    60
    val (ls, cargs, rs) = (map dest_Free ls', 
b0895662fba4 better indentation
paulson
parents: 6032
diff changeset
    61
			   map dest_Free cargs', 
b0895662fba4 better indentation
paulson
parents: 6032
diff changeset
    62
			   map dest_Free rs')
7016
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
    63
      handle TERM _ => raise RecError "illegal argument in pattern";
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    64
    val lfrees = ls @ rs @ cargs;
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    65
12474
0404454d97df Improved error messages.
berghofe
parents: 12448
diff changeset
    66
    fun check_vars _ [] = ()
0404454d97df Improved error messages.
berghofe
parents: 12448
diff changeset
    67
      | check_vars s vars = raise RecError (s ^ commas_quote (map fst vars))
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    68
  in
8973
ac448cd43452 improved error msgs, listing variable names
paulson
parents: 8480
diff changeset
    69
    if length middle > 1 then 
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    70
      raise RecError "more than one non-variable in pattern"
12474
0404454d97df Improved error messages.
berghofe
parents: 12448
diff changeset
    71
    else
18964
67f572e03236 renamed gen_duplicates to duplicates;
wenzelm
parents: 18928
diff changeset
    72
     (check_vars "repeated variable names in pattern: " (duplicates (op =) lfrees);
12474
0404454d97df Improved error messages.
berghofe
parents: 12448
diff changeset
    73
      check_vars "extra variables on rhs: "
0404454d97df Improved error messages.
berghofe
parents: 12448
diff changeset
    74
        (map dest_Free (term_frees rhs) \\ lfrees);
17184
3d80209e9a53 use AList operations;
wenzelm
parents: 17057
diff changeset
    75
      case AList.lookup (op =) rec_fns fnameT of
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
    76
        NONE =>
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
    77
          (fnameT, (tname, rpos, [(cname, (ls, cargs, rs, rhs, eq))]))::rec_fns
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
    78
      | SOME (_, rpos', eqns) =>
17184
3d80209e9a53 use AList operations;
wenzelm
parents: 17057
diff changeset
    79
          if AList.defined (op =) eqns cname then
6037
b0895662fba4 better indentation
paulson
parents: 6032
diff changeset
    80
            raise RecError "constructor already occurred as pattern"
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    81
          else if rpos <> rpos' then
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    82
            raise RecError "position of recursive argument inconsistent"
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    83
          else
17314
04e21a27c0ad introduces some modern-style AList operations
haftmann
parents: 17261
diff changeset
    84
            AList.update (op =) (fnameT, (tname, rpos, (cname, (ls, cargs, rs, rhs, eq))::eqns))
04e21a27c0ad introduces some modern-style AList operations
haftmann
parents: 17261
diff changeset
    85
              rec_fns)
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    86
  end
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    87
  handle RecError s => primrec_eq_err sign s eq;
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    88
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
    89
fun process_fun sign descr rec_eqns ((i, fnameT as (fname, _)), (fnameTs, fnss)) =
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    90
  let
15570
8d8c70b41bab Move towards standard functions.
skalberg
parents: 15531
diff changeset
    91
    val (_, (tname, _, constrs)) = List.nth (descr, i);
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    92
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    93
    (* substitute "fname ls x rs" by "y ls rs" for (x, (_, y)) in subs *)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    94
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    95
    fun subst [] x = x
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    96
      | subst subs (fs, Abs (a, T, t)) =
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    97
          let val (fs', t') = subst subs (fs, t)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    98
          in (fs', Abs (a, T, t')) end
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
    99
      | subst subs (fs, t as (_ $ _)) =
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   100
          let val (f, ts) = strip_comb t;
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   101
          in
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   102
            if is_Const f andalso dest_Const f mem map fst rec_eqns then
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   103
              let
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   104
                val fnameT' as (fname', _) = dest_Const f;
17184
3d80209e9a53 use AList operations;
wenzelm
parents: 17057
diff changeset
   105
                val (_, rpos, _) = the (AList.lookup (op =) rec_eqns fnameT');
15570
8d8c70b41bab Move towards standard functions.
skalberg
parents: 15531
diff changeset
   106
                val ls = Library.take (rpos, ts);
8d8c70b41bab Move towards standard functions.
skalberg
parents: 15531
diff changeset
   107
                val rest = Library.drop (rpos, ts);
7016
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
   108
                val (x', rs) = (hd rest, tl rest)
15570
8d8c70b41bab Move towards standard functions.
skalberg
parents: 15531
diff changeset
   109
                  handle Empty => raise RecError ("not enough arguments\
7016
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
   110
                   \ in recursive application\nof function " ^ quote fname' ^ " on rhs");
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
   111
                val (x, xs) = strip_comb x'
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   112
              in 
17184
3d80209e9a53 use AList operations;
wenzelm
parents: 17057
diff changeset
   113
                (case AList.lookup (op =) subs x of
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   114
                    NONE =>
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   115
                      let
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   116
                        val (fs', ts') = foldl_map (subst subs) (fs, ts)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   117
                      in (fs', list_comb (f, ts')) end
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   118
                  | SOME (i', y) =>
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   119
                      let
7016
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
   120
                        val (fs', ts') = foldl_map (subst subs) (fs, xs @ ls @ rs);
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   121
                        val fs'' = process_fun sign descr rec_eqns ((i', fnameT'), fs')
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   122
                      in (fs'', list_comb (y, ts'))
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   123
                      end)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   124
              end
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   125
            else
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   126
              let
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   127
                val (fs', f'::ts') = foldl_map (subst subs) (fs, f::ts)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   128
              in (fs', list_comb (f', ts')) end
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   129
          end
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   130
      | subst _ x = x;
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   131
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   132
    (* translate rec equations into function arguments suitable for rec comb *)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   133
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   134
    fun trans eqns ((cname, cargs), (fnameTs', fnss', fns)) =
17184
3d80209e9a53 use AList operations;
wenzelm
parents: 17057
diff changeset
   135
      (case AList.lookup (op =) eqns cname of
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   136
          NONE => (warning ("No equation for constructor " ^ quote cname ^
6427
fd36b2e7d80e tuned messages;
wenzelm
parents: 6425
diff changeset
   137
            "\nin definition of function " ^ quote fname);
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   138
              (fnameTs', fnss', (Const ("arbitrary", dummyT))::fns))
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   139
        | SOME (ls, cargs', rs, rhs, eq) =>
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   140
            let
15570
8d8c70b41bab Move towards standard functions.
skalberg
parents: 15531
diff changeset
   141
              val recs = List.filter (is_rec_type o snd) (cargs' ~~ cargs);
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   142
              val rargs = map fst recs;
6037
b0895662fba4 better indentation
paulson
parents: 6032
diff changeset
   143
              val subs = map (rpair dummyT o fst) 
b0895662fba4 better indentation
paulson
parents: 6032
diff changeset
   144
		             (rev (rename_wrt_term rhs rargs));
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   145
              val ((fnameTs'', fnss''), rhs') = 
6037
b0895662fba4 better indentation
paulson
parents: 6032
diff changeset
   146
		  (subst (map (fn ((x, y), z) =>
13641
63d1790a43ed Reimplemented parts of datatype package dealing with datatypes involving
berghofe
parents: 12876
diff changeset
   147
			       (Free x, (body_index y, Free z)))
6037
b0895662fba4 better indentation
paulson
parents: 6032
diff changeset
   148
			  (recs ~~ subs))
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   149
		   ((fnameTs', fnss'), rhs))
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   150
                  handle RecError s => primrec_eq_err sign s eq
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   151
            in (fnameTs'', fnss'', 
6037
b0895662fba4 better indentation
paulson
parents: 6032
diff changeset
   152
		(list_abs_free (cargs' @ subs @ ls @ rs, rhs'))::fns)
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   153
            end)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   154
17184
3d80209e9a53 use AList operations;
wenzelm
parents: 17057
diff changeset
   155
  in (case AList.lookup (op =) fnameTs i of
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   156
      NONE =>
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   157
        if exists (equal fnameT o snd) fnameTs then
6427
fd36b2e7d80e tuned messages;
wenzelm
parents: 6425
diff changeset
   158
          raise RecError ("inconsistent functions for datatype " ^ quote tname)
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   159
        else
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   160
          let
17184
3d80209e9a53 use AList operations;
wenzelm
parents: 17057
diff changeset
   161
            val (_, _, eqns) = the (AList.lookup (op =) rec_eqns fnameT);
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   162
            val (fnameTs', fnss', fns) = foldr (trans eqns)
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   163
              ((i, fnameT)::fnameTs, fnss, []) constrs
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   164
          in
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   165
            (fnameTs', (i, (fname, #1 (snd (hd eqns)), fns))::fnss')
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   166
          end
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   167
    | SOME fnameT' =>
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   168
        if fnameT = fnameT' then (fnameTs, fnss)
6427
fd36b2e7d80e tuned messages;
wenzelm
parents: 6425
diff changeset
   169
        else raise RecError ("inconsistent functions for datatype " ^ quote tname))
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   170
  end;
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   171
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   172
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   173
(* prepare functions needed for definitions *)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   174
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   175
fun get_fns fns (((i, (tname, _, constrs)), rec_name), (fs, defs)) =
17184
3d80209e9a53 use AList operations;
wenzelm
parents: 17057
diff changeset
   176
  case AList.lookup (op =) fns i of
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   177
     NONE =>
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   178
       let
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   179
         val dummy_fns = map (fn (_, cargs) => Const ("arbitrary",
15570
8d8c70b41bab Move towards standard functions.
skalberg
parents: 15531
diff changeset
   180
           replicate ((length cargs) + (length (List.filter is_rec_type cargs)))
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   181
             dummyT ---> HOLogic.unitT)) constrs;
6427
fd36b2e7d80e tuned messages;
wenzelm
parents: 6425
diff changeset
   182
         val _ = warning ("No function definition for datatype " ^ quote tname)
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   183
       in
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   184
         (dummy_fns @ fs, defs)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   185
       end
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   186
   | SOME (fname, ls, fs') => (fs' @ fs, (fname, ls, rec_name, tname)::defs);
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   187
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   188
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   189
(* make definition *)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   190
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   191
fun make_def sign fs (fname, ls, rec_name, tname) =
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   192
  let
15574
b1d1b5bfc464 Removed practically all references to Library.foldr.
skalberg
parents: 15570
diff changeset
   193
    val rhs = foldr (fn (T, t) => Abs ("", T, t)) 
b1d1b5bfc464 Removed practically all references to Library.foldr.
skalberg
parents: 15570
diff changeset
   194
	            (list_comb (Const (rec_name, dummyT),
b1d1b5bfc464 Removed practically all references to Library.foldr.
skalberg
parents: 15570
diff changeset
   195
				fs @ map Bound (0 ::(length ls downto 1))))
b1d1b5bfc464 Removed practically all references to Library.foldr.
skalberg
parents: 15570
diff changeset
   196
		    ((map snd ls) @ [dummyT]);
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   197
    val defpair = (Sign.base_name fname ^ "_" ^ Sign.base_name tname ^ "_def",
6037
b0895662fba4 better indentation
paulson
parents: 6032
diff changeset
   198
		   Logic.mk_equals (Const (fname, dummyT), rhs))
6394
3d9fd50fcc43 Theory.sign_of;
wenzelm
parents: 6384
diff changeset
   199
  in Theory.inferT_axm sign defpair end;
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   200
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   201
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   202
(* find datatypes which contain all datatypes in tnames' *)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   203
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   204
fun find_dts (dt_info : datatype_info Symtab.table) _ [] = []
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   205
  | find_dts dt_info tnames' (tname::tnames) =
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17314
diff changeset
   206
      (case Symtab.lookup dt_info tname of
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   207
          NONE => primrec_err (quote tname ^ " is not a datatype")
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   208
        | SOME dt =>
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   209
            if tnames' subset (map (#1 o snd) (#descr dt)) then
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   210
              (tname, dt)::(find_dts dt_info tnames' tnames)
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   211
            else find_dts dt_info tnames' tnames);
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   212
8432
daf6b3961ed4 adapted to new PureThy.add_thms etc.;
wenzelm
parents: 7904
diff changeset
   213
fun prepare_induct ({descr, induction, ...}: datatype_info) rec_eqns =
daf6b3961ed4 adapted to new PureThy.add_thms etc.;
wenzelm
parents: 7904
diff changeset
   214
  let
daf6b3961ed4 adapted to new PureThy.add_thms etc.;
wenzelm
parents: 7904
diff changeset
   215
    fun constrs_of (_, (_, _, cs)) =
daf6b3961ed4 adapted to new PureThy.add_thms etc.;
wenzelm
parents: 7904
diff changeset
   216
      map (fn (cname:string, (_, cargs, _, _, _)) => (cname, map fst cargs)) cs;
17184
3d80209e9a53 use AList operations;
wenzelm
parents: 17057
diff changeset
   217
    val params_of = these o AList.lookup (op =) (List.concat (map constrs_of rec_eqns));
8432
daf6b3961ed4 adapted to new PureThy.add_thms etc.;
wenzelm
parents: 7904
diff changeset
   218
  in
daf6b3961ed4 adapted to new PureThy.add_thms etc.;
wenzelm
parents: 7904
diff changeset
   219
    induction
15570
8d8c70b41bab Move towards standard functions.
skalberg
parents: 15531
diff changeset
   220
    |> RuleCases.rename_params (map params_of (List.concat (map (map #1 o #3 o #2) descr)))
10525
3e21ab3e5114 RuleCases.save;
wenzelm
parents: 9575
diff changeset
   221
    |> RuleCases.save induction
8432
daf6b3961ed4 adapted to new PureThy.add_thms etc.;
wenzelm
parents: 7904
diff changeset
   222
  end;
daf6b3961ed4 adapted to new PureThy.add_thms etc.;
wenzelm
parents: 7904
diff changeset
   223
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   224
fun add_primrec_i alt_name eqns_atts thy =
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   225
  let
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   226
    val (eqns, atts) = split_list eqns_atts;
6394
3d9fd50fcc43 Theory.sign_of;
wenzelm
parents: 6384
diff changeset
   227
    val sg = Theory.sign_of thy;
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   228
    val dt_info = DatatypePackage.get_datatypes thy;
15574
b1d1b5bfc464 Removed practically all references to Library.foldr.
skalberg
parents: 15570
diff changeset
   229
    val rec_eqns = foldr (process_eqn sg) [] (map snd eqns);
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   230
    val tnames = distinct (map (#1 o snd) rec_eqns);
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   231
    val dts = find_dts dt_info tnames tnames;
6037
b0895662fba4 better indentation
paulson
parents: 6032
diff changeset
   232
    val main_fns = 
18362
e8b7e0a22727 removed thms 'swap' and 'nth_map' from ML toplevel
haftmann
parents: 18358
diff changeset
   233
      map (fn (tname, {index, ...}) =>
e8b7e0a22727 removed thms 'swap' and 'nth_map' from ML toplevel
haftmann
parents: 18358
diff changeset
   234
        (index, 
e8b7e0a22727 removed thms 'swap' and 'nth_map' from ML toplevel
haftmann
parents: 18358
diff changeset
   235
          (fst o the o find_first (fn f => (#1 o snd) f = tname)) rec_eqns))
e8b7e0a22727 removed thms 'swap' and 'nth_map' from ML toplevel
haftmann
parents: 18358
diff changeset
   236
      dts;
6037
b0895662fba4 better indentation
paulson
parents: 6032
diff changeset
   237
    val {descr, rec_names, rec_rewrites, ...} = 
18362
e8b7e0a22727 removed thms 'swap' and 'nth_map' from ML toplevel
haftmann
parents: 18358
diff changeset
   238
      if null dts then
e8b7e0a22727 removed thms 'swap' and 'nth_map' from ML toplevel
haftmann
parents: 18358
diff changeset
   239
        primrec_err ("datatypes " ^ commas_quote tnames ^ "\nare not mutually recursive")
e8b7e0a22727 removed thms 'swap' and 'nth_map' from ML toplevel
haftmann
parents: 18358
diff changeset
   240
      else snd (hd dts);
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   241
    val (fnameTs, fnss) = foldr (process_fun sg descr rec_eqns)
15574
b1d1b5bfc464 Removed practically all references to Library.foldr.
skalberg
parents: 15570
diff changeset
   242
	                       ([], []) main_fns;
b1d1b5bfc464 Removed practically all references to Library.foldr.
skalberg
parents: 15570
diff changeset
   243
    val (fs, defs) = foldr (get_fns fnss) ([], []) (descr ~~ rec_names);
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   244
    val defs' = map (make_def sg fs) defs;
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   245
    val nameTs1 = map snd fnameTs;
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   246
    val nameTs2 = map fst rec_eqns;
8432
daf6b3961ed4 adapted to new PureThy.add_thms etc.;
wenzelm
parents: 7904
diff changeset
   247
    val primrec_name =
daf6b3961ed4 adapted to new PureThy.add_thms etc.;
wenzelm
parents: 7904
diff changeset
   248
      if alt_name = "" then (space_implode "_" (map (Sign.base_name o #1) defs)) else alt_name;
18358
0a733e11021a re-oriented some result tuples in PureThy
haftmann
parents: 17985
diff changeset
   249
    val (defs_thms', thy') = thy |> Theory.add_path primrec_name |>
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   250
      (if eq_set (nameTs1, nameTs2) then (PureThy.add_defs_i false o map Thm.no_attributes) defs'
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   251
       else primrec_err ("functions " ^ commas_quote (map fst nameTs2) ^
5216
f0a66af5f2cb Equations are now stored in theory.
berghofe
parents: 5178
diff changeset
   252
         "\nare not mutually recursive"));
13641
63d1790a43ed Reimplemented parts of datatype package dealing with datatypes involving
berghofe
parents: 12876
diff changeset
   253
    val rewrites = (map mk_meta_eq rec_rewrites) @ defs_thms';
16765
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   254
    val _ = message ("Proving equations for primrec function(s) " ^
b8b1f310877f Some changes to allow mutually recursive, overloaded functions with same name.
berghofe
parents: 16646
diff changeset
   255
      commas_quote (map fst nameTs1) ^ " ...");
17985
d5d576b72371 avoid legacy goals;
wenzelm
parents: 17959
diff changeset
   256
    val simps = map (fn (_, t) => standard (Goal.prove thy' [] [] t
d5d576b72371 avoid legacy goals;
wenzelm
parents: 17959
diff changeset
   257
        (fn _ => EVERY [rewrite_goals_tac rewrites, rtac refl 1]))) eqns;
18377
0e1d025d57b3 oriented result pairs in PureThy
haftmann
parents: 18362
diff changeset
   258
    val (simps', thy'') = PureThy.add_thms ((map fst eqns ~~ simps) ~~ atts) thy';
9575
af71f5f4ca6b Equations that are added to the simpset now have proper names.
berghofe
parents: 9315
diff changeset
   259
    val thy''' = thy''
18377
0e1d025d57b3 oriented result pairs in PureThy
haftmann
parents: 18362
diff changeset
   260
      |> (snd o PureThy.add_thmss [(("simps", simps'),
18728
6790126ab5f6 simplified type attribute;
wenzelm
parents: 18688
diff changeset
   261
          [Simplifier.simp_add, RecfunCodegen.add NONE])])
18377
0e1d025d57b3 oriented result pairs in PureThy
haftmann
parents: 18362
diff changeset
   262
      |> (snd o PureThy.add_thms [(("induct", prepare_induct (#2 (hd dts)) rec_eqns), [])])
9575
af71f5f4ca6b Equations that are added to the simpset now have proper names.
berghofe
parents: 9315
diff changeset
   263
      |> Theory.parent_path
8480
50266d517b0c Added new theory data slot for primrec equations.
berghofe
parents: 8432
diff changeset
   264
  in
12448
473cb9f9e237 Recursive equations to be used for code generation are now registered
berghofe
parents: 12311
diff changeset
   265
    (thy''', simps')
8480
50266d517b0c Added new theory data slot for primrec equations.
berghofe
parents: 8432
diff changeset
   266
  end;
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   267
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   268
7016
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
   269
fun add_primrec alt_name eqns thy =
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
   270
  let
7544
dee529666dcd Fixed bug in add_primrec which caused non-informative error message.
berghofe
parents: 7152
diff changeset
   271
    val sign = Theory.sign_of thy;
7016
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
   272
    val ((names, strings), srcss) = apfst split_list (split_list eqns);
18728
6790126ab5f6 simplified type attribute;
wenzelm
parents: 18688
diff changeset
   273
    val atts = map (map (Attrib.attribute thy)) srcss;
14258
9bd184c007f0 Improved error handling: add_primrec now prints out ill-formed equation
berghofe
parents: 13641
diff changeset
   274
    val eqn_ts = map (fn s => term_of (Thm.read_cterm sign (s, propT))
18678
dd0c569fa43d sane ERROR handling;
wenzelm
parents: 18377
diff changeset
   275
      handle ERROR msg => cat_error msg ("The error(s) above occurred for " ^ s)) strings;
7016
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
   276
    val rec_ts = map (fn eq => head_of (fst (HOLogic.dest_eq (HOLogic.dest_Trueprop eq)))
7544
dee529666dcd Fixed bug in add_primrec which caused non-informative error message.
berghofe
parents: 7152
diff changeset
   277
      handle TERM _ => primrec_eq_err sign "not a proper equation" eq) eqn_ts;
7016
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
   278
    val (_, eqn_ts') = InductivePackage.unify_consts (sign_of thy) rec_ts eqn_ts
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
   279
  in
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
   280
    add_primrec_i alt_name (names ~~ eqn_ts' ~~ atts) thy
df54b5365477 - Now also supports arbitrarily branching datatypes.
berghofe
parents: 6729
diff changeset
   281
  end;
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   282
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   283
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   284
(* outer syntax *)
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   285
17057
0934ac31985f OuterKeyword;
wenzelm
parents: 16765
diff changeset
   286
local structure P = OuterParse and K = OuterKeyword in
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   287
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   288
val primrec_decl =
6723
f342449d73ca outer syntax keyword classification;
wenzelm
parents: 6430
diff changeset
   289
  Scan.optional (P.$$$ "(" |-- P.name --| P.$$$ ")") "" --
12876
a70df1e5bf10 got rid of explicit marginal comments (now stripped earlier from input);
wenzelm
parents: 12474
diff changeset
   290
    Scan.repeat1 (P.opt_thm_name ":" -- P.prop);
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   291
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   292
val primrecP =
6723
f342449d73ca outer syntax keyword classification;
wenzelm
parents: 6430
diff changeset
   293
  OuterSyntax.command "primrec" "define primitive recursive functions on datatypes" K.thy_decl
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   294
    (primrec_decl >> (fn (alt_name, eqns) =>
6723
f342449d73ca outer syntax keyword classification;
wenzelm
parents: 6430
diff changeset
   295
      Toplevel.theory (#1 o add_primrec alt_name (map P.triple_swap eqns))));
6359
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   296
6fdb0badc6f4 add_primrec(_i): attributes;
wenzelm
parents: 6092
diff changeset
   297
val _ = OuterSyntax.add_parsers [primrecP];
5178
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   298
9337b230ff15 New primrec function definition package
berghofe
parents:
diff changeset
   299
end;
6384
eed1273c9146 local open OuterParse;
wenzelm
parents: 6359
diff changeset
   300
eed1273c9146 local open OuterParse;
wenzelm
parents: 6359
diff changeset
   301
eed1273c9146 local open OuterParse;
wenzelm
parents: 6359
diff changeset
   302
end;
15705
b5edb9dcec9a *** MESSAGE REFERS TO PREVIOUS VERSION ***
wenzelm
parents: 15703
diff changeset
   303