src/Pure/pattern.ML
author wenzelm
Thu, 21 Sep 2006 19:05:22 +0200
changeset 20672 b96394d8c702
parent 20098 19871ee094b1
child 22255 8fcd11cb9be7
permissions -rw-r--r--
member (op =); tuned pattern check;
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
     1
(*  Title:      Pure/pattern.ML
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     2
    ID:         $Id$
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
     3
    Author:     Tobias Nipkow, Christine Heinzelmann, and Stefan Berghofer
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     4
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     5
Unification of Higher-Order Patterns.
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     6
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     7
See also:
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     8
Tobias Nipkow. Functional Unification of Higher-Order Patterns.
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     9
In Proceedings of the 8th IEEE Symposium Logic in Computer Science, 1993.
678
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
    10
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
    11
TODO: optimize red by special-casing it
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    12
*)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    13
2751
673c4eefd2e1 Corrected aeconv and exported it
paulson
parents: 2725
diff changeset
    14
infix aeconv;
673c4eefd2e1 Corrected aeconv and exported it
paulson
parents: 2725
diff changeset
    15
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    16
signature PATTERN =
14787
724ce6e574e3 adapted tsig interface;
wenzelm
parents: 14643
diff changeset
    17
sig
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    18
  val trace_unify_fail: bool ref
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    19
  val aeconv: term * term -> bool
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    20
  val eta_long: typ list -> term -> term
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    21
  val eta_contract_atom: term -> term
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
    22
  val match: theory -> term * term -> Type.tyenv * Envir.tenv -> Type.tyenv * Envir.tenv
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
    23
  val first_order_match: theory -> term * term
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
    24
    -> Type.tyenv * Envir.tenv -> Type.tyenv * Envir.tenv
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    25
  val matches: theory -> term * term -> bool
19880
1b0d48257caf added equiv;
wenzelm
parents: 19863
diff changeset
    26
  val equiv: theory -> term * term -> bool
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    27
  val matches_subterm: theory -> term * term -> bool
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
    28
  val unify: theory -> term * term -> Envir.env -> Envir.env
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    29
  val first_order: term -> bool
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    30
  val pattern: term -> bool
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    31
  val rewrite_term: theory -> (term * term) list -> (term -> term option) list -> term -> term
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    32
  exception Unif
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    33
  exception MATCH
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    34
  exception Pattern
14787
724ce6e574e3 adapted tsig interface;
wenzelm
parents: 14643
diff changeset
    35
end;
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    36
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    37
structure Pattern: PATTERN =
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    38
struct
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    39
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    40
exception Unif;
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    41
exception Pattern;
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    42
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    43
val trace_unify_fail = ref false;
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    44
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    45
fun string_of_term thy env binders t = Sign.string_of_term thy
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    46
  (Envir.norm_term env (subst_bounds(map Free binders,t)));
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    47
18011
685d95c793ff cleaned up nth, nth_update, nth_map and nth_string functions
haftmann
parents: 17756
diff changeset
    48
fun bname binders i = fst (nth binders i);
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    49
fun bnames binders is = space_implode " " (map (bname binders) is);
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    50
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    51
fun typ_clash thy (tye,T,U) =
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    52
  if !trace_unify_fail
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    53
  then let val t = Sign.string_of_typ thy (Envir.norm_type tye T)
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    54
           and u = Sign.string_of_typ thy (Envir.norm_type tye U)
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    55
       in tracing("The following types do not unify:\n" ^ t ^ "\n" ^ u) end
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    56
  else ()
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    57
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    58
fun clash a b =
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    59
  if !trace_unify_fail then tracing("Clash: " ^ a ^ " =/= " ^ b) else ()
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    60
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    61
fun boundVar binders i =
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    62
  "bound variable " ^ bname binders i ^ " (depth " ^ string_of_int i ^ ")";
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    63
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    64
fun clashBB binders i j =
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    65
  if !trace_unify_fail then clash (boundVar binders i) (boundVar binders j)
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    66
  else ()
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    67
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    68
fun clashB binders i s =
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    69
  if !trace_unify_fail then clash (boundVar binders i) s
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    70
  else ()
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    71
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    72
fun proj_fail thy (env,binders,F,_,is,t) =
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    73
  if !trace_unify_fail
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    74
  then let val f = Syntax.string_of_vname F
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    75
           val xs = bnames binders is
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    76
           val u = string_of_term thy env binders t
19300
7689f81f8996 subtract (op =);
wenzelm
parents: 18940
diff changeset
    77
           val ys = bnames binders (subtract (op =) is (loose_bnos t))
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    78
       in tracing("Cannot unify variable " ^ f ^
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    79
               " (depending on bound variables " ^ xs ^ ")\nwith term " ^ u ^
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    80
               "\nTerm contains additional bound variable(s) " ^ ys)
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    81
       end
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    82
  else ()
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    83
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    84
fun ocheck_fail thy (F,t,binders,env) =
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    85
  if !trace_unify_fail
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    86
  then let val f = Syntax.string_of_vname F
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
    87
           val u = string_of_term thy env binders t
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    88
       in tracing("Variable " ^ f ^ " occurs in term\n" ^ u ^
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    89
                  "\nCannot unify!\n")
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    90
       end
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    91
  else ()
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
    92
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
    93
fun occurs(F,t,env) =
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
    94
    let fun occ(Var (G, T))   = (case Envir.lookup (env, (G, T)) of
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
    95
                                 SOME(t) => occ t
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
    96
                               | NONE    => F=G)
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    97
          | occ(t1$t2)      = occ t1 orelse occ t2
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    98
          | occ(Abs(_,_,t)) = occ t
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    99
          | occ _           = false
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   100
    in occ t end;
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   101
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   102
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   103
fun mapbnd f =
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   104
    let fun mpb d (Bound(i))     = if i < d then Bound(i) else Bound(f(i-d)+d)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   105
          | mpb d (Abs(s,T,t))   = Abs(s,T,mpb(d+1) t)
678
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
   106
          | mpb d ((u1 $ u2))    = (mpb d u1)$(mpb d u2)
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
   107
          | mpb _ atom           = atom
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   108
    in mpb 0 end;
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   109
14861
ca5cae7fb65a Removed ~10000 hack in function idx that can lead to inconsistencies
berghofe
parents: 14787
diff changeset
   110
fun idx [] j     = raise Unif
16668
fdb4992cf1d2 avoid polyeq;
wenzelm
parents: 16651
diff changeset
   111
  | idx(i::is) j = if (i:int) =j then length is else idx is j;
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   112
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   113
fun mkabs (binders,is,t)  =
18011
685d95c793ff cleaned up nth, nth_update, nth_map and nth_string functions
haftmann
parents: 17756
diff changeset
   114
    let fun mk(i::is) = let val (x,T) = nth binders i
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   115
                        in Abs(x,T,mk is) end
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   116
          | mk []     = t
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   117
    in mk is end;
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   118
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   119
val incr = mapbnd (fn i => i+1);
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   120
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   121
fun ints_of []             = []
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   122
  | ints_of (Bound i ::bs) =
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   123
      let val is = ints_of bs
20672
b96394d8c702 member (op =);
wenzelm
parents: 20098
diff changeset
   124
      in if member (op =) is i then raise Pattern else i::is end
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   125
  | ints_of _              = raise Pattern;
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   126
12232
ff75ed08b3fb Replaced devar by Envir.head_norm
berghofe
parents: 8406
diff changeset
   127
fun ints_of' env ts = ints_of (map (Envir.head_norm env) ts);
ff75ed08b3fb Replaced devar by Envir.head_norm
berghofe
parents: 8406
diff changeset
   128
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   129
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   130
fun app (s,(i::is)) = app (s$Bound(i),is)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   131
  | app (s,[])      = s;
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   132
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   133
fun red (Abs(_,_,s)) (i::is) js = red s is (i::js)
678
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
   134
  | red t            []      [] = t
18011
685d95c793ff cleaned up nth, nth_update, nth_map and nth_string functions
haftmann
parents: 17756
diff changeset
   135
  | red t            is      jn = app (mapbnd (nth jn) t,is);
678
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
   136
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   137
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   138
(* split_type ([T1,....,Tn]---> T,n,[]) = ([Tn,...,T1],T) *)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   139
fun split_type (T,0,Ts)                    = (Ts,T)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   140
  | split_type (Type ("fun",[T1,T2]),n,Ts) = split_type (T2,n-1,T1::Ts)
678
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
   141
  | split_type _                           = error("split_type");
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   142
13891
ae9a2a433388 type_of_G now applies type substitution before decomposing type.
berghofe
parents: 13645
diff changeset
   143
fun type_of_G (env as Envir.Envir {iTs, ...}) (T,n,is) =
ae9a2a433388 type_of_G now applies type substitution before decomposing type.
berghofe
parents: 13645
diff changeset
   144
  let val (Ts, U) = split_type (Envir.norm_type iTs T, n, [])
18011
685d95c793ff cleaned up nth, nth_update, nth_map and nth_string functions
haftmann
parents: 17756
diff changeset
   145
  in map (nth Ts) is ---> U end;
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   146
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   147
fun mkhnf (binders,is,G,js) = mkabs (binders, is, app(G,js));
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   148
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   149
fun mknewhnf(env,binders,is,F as (a,_),T,js) =
13891
ae9a2a433388 type_of_G now applies type substitution before decomposing type.
berghofe
parents: 13645
diff changeset
   150
  let val (env',G) = Envir.genvar a (env,type_of_G env (T,length is,js))
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   151
  in Envir.update (((F, T), mkhnf (binders, is, G, js)), env') end;
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   152
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   153
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   154
(* mk_proj_list(is) = [ |is| - k | 1 <= k <= |is| and is[k] >= 0 ] *)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   155
fun mk_proj_list is =
19502
wenzelm
parents: 19482
diff changeset
   156
    let fun mk(i::is,j) = if is_some i then j :: mk(is,j-1) else mk(is,j-1)
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   157
          | mk([],_)    = []
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   158
    in mk(is,length is - 1) end;
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   159
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   160
fun proj(s,env,binders,is) =
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   161
    let fun trans d i = if i<d then i else (idx is (i-d))+d;
12232
ff75ed08b3fb Replaced devar by Envir.head_norm
berghofe
parents: 8406
diff changeset
   162
        fun pr(s,env,d,binders) = (case Envir.head_norm env s of
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   163
              Abs(a,T,t) => let val (t',env') = pr(t,env,d+1,((a,T)::binders))
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   164
                            in (Abs(a,T,t'),env') end
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   165
            | t => (case strip_comb t of
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   166
                (c as Const _,ts) =>
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   167
                         let val (ts',env') = prs(ts,env,d,binders)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   168
                         in (list_comb(c,ts'),env') end
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   169
                 | (f as Free _,ts) =>
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   170
                         let val (ts',env') = prs(ts,env,d,binders)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   171
                         in (list_comb(f,ts'),env') end
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   172
                 | (Bound(i),ts) =>
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   173
                         let val j = trans d i
14861
ca5cae7fb65a Removed ~10000 hack in function idx that can lead to inconsistencies
berghofe
parents: 14787
diff changeset
   174
                             val (ts',env') = prs(ts,env,d,binders)
ca5cae7fb65a Removed ~10000 hack in function idx that can lead to inconsistencies
berghofe
parents: 14787
diff changeset
   175
                         in (list_comb(Bound j,ts'),env') end
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   176
                 | (Var(F as (a,_),Fty),ts) =>
12232
ff75ed08b3fb Replaced devar by Envir.head_norm
berghofe
parents: 8406
diff changeset
   177
                      let val js = ints_of' env ts;
14861
ca5cae7fb65a Removed ~10000 hack in function idx that can lead to inconsistencies
berghofe
parents: 14787
diff changeset
   178
                          val js' = map (try (trans d)) js;
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   179
                          val ks = mk_proj_list js';
19482
9f11af8f7ef9 tuned basic list operators (flat, maps, map_filter);
wenzelm
parents: 19300
diff changeset
   180
                          val ls = map_filter I js'
13891
ae9a2a433388 type_of_G now applies type substitution before decomposing type.
berghofe
parents: 13645
diff changeset
   181
                          val Hty = type_of_G env (Fty,length js,ks)
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   182
                          val (env',H) = Envir.genvar a (env,Hty)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   183
                          val env'' =
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   184
                            Envir.update (((F, Fty), mkhnf (binders, js, H, ks)), env')
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   185
                      in (app(H,ls),env'') end
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   186
                 | _  => raise Pattern))
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   187
        and prs(s::ss,env,d,binders) =
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   188
              let val (s',env1) = pr(s,env,d,binders)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   189
                  val (ss',env2) = prs(ss,env1,d,binders)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   190
              in (s'::ss',env2) end
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   191
          | prs([],env,_,_) = ([],env)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   192
   in if downto0(is,length binders - 1) then (s,env)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   193
      else pr(s,env,0,binders)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   194
   end;
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   195
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   196
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   197
(* mk_ff_list(is,js) = [ length(is) - k | 1 <= k <= |is| and is[k] = js[k] ] *)
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   198
fun mk_ff_list(is,js) =
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   199
    let fun mk([],[],_)        = []
16668
fdb4992cf1d2 avoid polyeq;
wenzelm
parents: 16651
diff changeset
   200
          | mk(i::is,j::js, k) = if (i:int) = j then k :: mk(is,js,k-1)
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   201
                                        else mk(is,js,k-1)
678
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
   202
          | mk _               = error"mk_ff_list"
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   203
    in mk(is,js,length is-1) end;
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   204
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   205
fun flexflex1(env,binders,F,Fty,is,js) =
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   206
  if is=js then env
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   207
  else let val ks = mk_ff_list(is,js)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   208
       in mknewhnf(env,binders,is,F,Fty,ks) end;
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   209
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   210
fun flexflex2(env,binders,F,Fty,is,G,Gty,js) =
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   211
  let fun ff(F,Fty,is,G as (a,_),Gty,js) =
1576
af8f43f742a0 Added some optimized versions of functions dealing with sets
berghofe
parents: 1501
diff changeset
   212
            if js subset_int is
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   213
            then let val t= mkabs(binders,is,app(Var(G,Gty),map (idx is) js))
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   214
                 in Envir.update (((F, Fty), t), env) end
1576
af8f43f742a0 Added some optimized versions of functions dealing with sets
berghofe
parents: 1501
diff changeset
   215
            else let val ks = is inter_int js
13891
ae9a2a433388 type_of_G now applies type substitution before decomposing type.
berghofe
parents: 13645
diff changeset
   216
                     val Hty = type_of_G env (Fty,length is,map (idx is) ks)
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   217
                     val (env',H) = Envir.genvar a (env,Hty)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   218
                     fun lam(is) = mkabs(binders,is,app(H,map (idx is) ks));
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   219
                 in Envir.update (((G, Gty), lam js), Envir.update (((F, Fty), lam is), env'))
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   220
                 end;
20098
19871ee094b1 removed obsolete xless;
wenzelm
parents: 20079
diff changeset
   221
  in if Term.indexname_ord (G,F) = LESS then ff(F,Fty,is,G,Gty,js) else ff(G,Gty,js,F,Fty,is) end
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   222
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   223
fun unify_types thy (T,U) (env as Envir.Envir{asol,iTs,maxidx}) =
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   224
  if T=U then env
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   225
  else let val (iTs',maxidx') = Sign.typ_unify thy (U, T) (iTs, maxidx)
1435
aefcd255ed4a Removed bug in type unification. Negative indexes are not used any longer.
nipkow
parents: 1029
diff changeset
   226
       in Envir.Envir{asol=asol,maxidx=maxidx',iTs=iTs'} end
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   227
       handle Type.TUNIFY => (typ_clash thy (iTs,T,U); raise Unif);
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   228
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   229
fun unif thy binders (s,t) env = case (Envir.head_norm env s, Envir.head_norm env t) of
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   230
      (Abs(ns,Ts,ts),Abs(nt,Tt,tt)) =>
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   231
         let val name = if ns = "" then nt else ns
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   232
         in unif thy ((name,Ts)::binders) (ts,tt) env end
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   233
    | (Abs(ns,Ts,ts),t) => unif thy ((ns,Ts)::binders) (ts,(incr t)$Bound(0)) env
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   234
    | (t,Abs(nt,Tt,tt)) => unif thy ((nt,Tt)::binders) ((incr t)$Bound(0),tt) env
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   235
    | p => cases thy (binders,env,p)
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   236
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   237
and cases thy (binders,env,(s,t)) = case (strip_comb s,strip_comb t) of
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   238
       ((Var(F,Fty),ss),(Var(G,Gty),ts)) =>
12232
ff75ed08b3fb Replaced devar by Envir.head_norm
berghofe
parents: 8406
diff changeset
   239
         if F = G then flexflex1(env,binders,F,Fty,ints_of' env ss,ints_of' env ts)
ff75ed08b3fb Replaced devar by Envir.head_norm
berghofe
parents: 8406
diff changeset
   240
                  else flexflex2(env,binders,F,Fty,ints_of' env ss,G,Gty,ints_of' env ts)
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   241
      | ((Var(F,Fty),ss),_)           => flexrigid thy (env,binders,F,Fty,ints_of' env ss,t)
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   242
      | (_,(Var(F,Fty),ts))           => flexrigid thy (env,binders,F,Fty,ints_of' env ts,s)
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   243
      | ((Const c,ss),(Const d,ts))   => rigidrigid thy (env,binders,c,d,ss,ts)
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   244
      | ((Free(f),ss),(Free(g),ts))   => rigidrigid thy (env,binders,f,g,ss,ts)
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   245
      | ((Bound(i),ss),(Bound(j),ts)) => rigidrigidB thy (env,binders,i,j,ss,ts)
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   246
      | ((Abs(_),_),_)                => raise Pattern
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   247
      | (_,(Abs(_),_))                => raise Pattern
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
   248
      | ((Const(c,_),_),(Free(f,_),_)) => (clash c f; raise Unif)
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
   249
      | ((Const(c,_),_),(Bound i,_))   => (clashB binders i c; raise Unif)
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
   250
      | ((Free(f,_),_),(Const(c,_),_)) => (clash f c; raise Unif)
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
   251
      | ((Free(f,_),_),(Bound i,_))    => (clashB binders i f; raise Unif)
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
   252
      | ((Bound i,_),(Const(c,_),_))   => (clashB binders i c; raise Unif)
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
   253
      | ((Bound i,_),(Free(f,_),_))    => (clashB binders i f; raise Unif)
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
   254
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   255
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   256
and rigidrigid thy (env,binders,(a,Ta),(b,Tb),ss,ts) =
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
   257
      if a<>b then (clash a b; raise Unif)
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   258
      else env |> unify_types thy (Ta,Tb) |> fold (unif thy binders) (ss~~ts)
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   259
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   260
and rigidrigidB thy (env,binders,i,j,ss,ts) =
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
   261
     if i <> j then (clashBB binders i j; raise Unif)
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   262
     else fold (unif thy binders) (ss~~ts) env
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   263
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   264
and flexrigid thy (params as (env,binders,F,Fty,is,t)) =
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   265
      if occurs(F,t,env) then (ocheck_fail thy (F,t,binders,env); raise Unif)
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
   266
      else (let val (u,env') = proj(t,env,binders,is)
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   267
            in Envir.update (((F, Fty), mkabs (binders, is, u)), env') end
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   268
            handle Unif => (proj_fail thy params; raise Unif));
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   269
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   270
fun unify thy = unif thy [];
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   271
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   272
6539
2e7d2fba9f6c Eta contraction is now performed all the time during rewriting.
nipkow
parents: 4820
diff changeset
   273
(*Eta-contract a term from outside: just enough to reduce it to an atom
2e7d2fba9f6c Eta contraction is now performed all the time during rewriting.
nipkow
parents: 4820
diff changeset
   274
DOESN'T QUITE WORK!
2e7d2fba9f6c Eta contraction is now performed all the time during rewriting.
nipkow
parents: 4820
diff changeset
   275
*)
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   276
fun eta_contract_atom (t0 as Abs(a, T, body)) =
2725
9453616d4b80 Declares eta_contract_atom; fixed comment; some tidying
paulson
parents: 2616
diff changeset
   277
      (case  eta_contract2 body  of
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   278
        body' as (f $ Bound 0) =>
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   279
            if loose_bvar1(f,0) then Abs(a,T,body')
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   280
            else eta_contract_atom (incr_boundvars ~1 f)
2725
9453616d4b80 Declares eta_contract_atom; fixed comment; some tidying
paulson
parents: 2616
diff changeset
   281
      | _ => t0)
9453616d4b80 Declares eta_contract_atom; fixed comment; some tidying
paulson
parents: 2616
diff changeset
   282
  | eta_contract_atom t = t
9453616d4b80 Declares eta_contract_atom; fixed comment; some tidying
paulson
parents: 2616
diff changeset
   283
and eta_contract2 (f$t) = f $ eta_contract_atom t
9453616d4b80 Declares eta_contract_atom; fixed comment; some tidying
paulson
parents: 2616
diff changeset
   284
  | eta_contract2 t     = eta_contract_atom t;
9453616d4b80 Declares eta_contract_atom; fixed comment; some tidying
paulson
parents: 2616
diff changeset
   285
13998
75a399c2781f Added new function eta_long.
berghofe
parents: 13891
diff changeset
   286
(* put a term into eta long beta normal form *)
75a399c2781f Added new function eta_long.
berghofe
parents: 13891
diff changeset
   287
fun eta_long Ts (Abs (s, T, t)) = Abs (s, T, eta_long (T :: Ts) t)
75a399c2781f Added new function eta_long.
berghofe
parents: 13891
diff changeset
   288
  | eta_long Ts t = (case strip_comb t of
75a399c2781f Added new function eta_long.
berghofe
parents: 13891
diff changeset
   289
      (Abs _, _) => eta_long Ts (Envir.beta_norm t)
14787
724ce6e574e3 adapted tsig interface;
wenzelm
parents: 14643
diff changeset
   290
    | (u, ts) =>
13998
75a399c2781f Added new function eta_long.
berghofe
parents: 13891
diff changeset
   291
      let
75a399c2781f Added new function eta_long.
berghofe
parents: 13891
diff changeset
   292
        val Us = binder_types (fastype_of1 (Ts, t));
75a399c2781f Added new function eta_long.
berghofe
parents: 13891
diff changeset
   293
        val i = length Us
75a399c2781f Added new function eta_long.
berghofe
parents: 13891
diff changeset
   294
      in list_abs (map (pair "x") Us,
75a399c2781f Added new function eta_long.
berghofe
parents: 13891
diff changeset
   295
        list_comb (incr_boundvars i u, map (eta_long (rev Us @ Ts))
75a399c2781f Added new function eta_long.
berghofe
parents: 13891
diff changeset
   296
          (map (incr_boundvars i) ts @ map Bound (i - 1 downto 0))))
75a399c2781f Added new function eta_long.
berghofe
parents: 13891
diff changeset
   297
      end);
75a399c2781f Added new function eta_long.
berghofe
parents: 13891
diff changeset
   298
2725
9453616d4b80 Declares eta_contract_atom; fixed comment; some tidying
paulson
parents: 2616
diff changeset
   299
678
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
   300
(*Tests whether 2 terms are alpha/eta-convertible and have same type.
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
   301
  Note that Consts and Vars may have more than one type.*)
2751
673c4eefd2e1 Corrected aeconv and exported it
paulson
parents: 2725
diff changeset
   302
fun t aeconv u = aconv_aux (eta_contract_atom t, eta_contract_atom u)
673c4eefd2e1 Corrected aeconv and exported it
paulson
parents: 2725
diff changeset
   303
and aconv_aux (Const(a,T), Const(b,U)) = a=b  andalso  T=U
673c4eefd2e1 Corrected aeconv and exported it
paulson
parents: 2725
diff changeset
   304
  | aconv_aux (Free(a,T),  Free(b,U))  = a=b  andalso  T=U
673c4eefd2e1 Corrected aeconv and exported it
paulson
parents: 2725
diff changeset
   305
  | aconv_aux (Var(v,T),   Var(w,U))   = eq_ix(v,w) andalso  T=U
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   306
  | aconv_aux (Bound i,    Bound j)    = i=j
2751
673c4eefd2e1 Corrected aeconv and exported it
paulson
parents: 2725
diff changeset
   307
  | aconv_aux (Abs(_,T,t), Abs(_,U,u)) = (t aeconv u)  andalso  T=U
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   308
  | aconv_aux (f$t,        g$u)        = (f aeconv g)  andalso (t aeconv u)
2751
673c4eefd2e1 Corrected aeconv and exported it
paulson
parents: 2725
diff changeset
   309
  | aconv_aux _ =  false;
678
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
   310
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
   311
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   312
(*** Matching ***)
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   313
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   314
exception MATCH;
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   315
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   316
fun typ_match thy TU tyenv = Sign.typ_match thy TU tyenv
16939
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   317
  handle Type.TYPE_MATCH => raise MATCH;
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   318
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   319
(*First-order matching;
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   320
  The pattern and object may have variables in common.
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   321
  Instantiation does not affect the object, so matching ?a with ?a+1 works.
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   322
  Object is eta-contracted on the fly (by eta-expanding the pattern).
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   323
  Precondition: the pattern is already eta-contracted!
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   324
  Types are matched on the fly*)
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   325
fun first_order_match thy =
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   326
  let
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   327
    fun mtch (instsp as (tyinsts,insts)) = fn
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   328
        (Var(ixn,T), t)  =>
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   329
          if loose_bvar(t,0) then raise MATCH
16651
40b96a501773 Changed interface of Envir.lookup'
berghofe
parents: 15797
diff changeset
   330
          else (case Envir.lookup' (insts, (ixn, T)) of
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   331
                  NONE => (typ_match thy (T, fastype_of t) tyinsts,
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   332
                           Vartab.update_new (ixn, (T, t)) insts)
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   333
                | SOME u => if t aeconv u then instsp else raise MATCH)
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   334
      | (Free (a,T), Free (b,U)) =>
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   335
          if a=b then (typ_match thy (T,U) tyinsts, insts) else raise MATCH
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   336
      | (Const (a,T), Const (b,U))  =>
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   337
          if a=b then (typ_match thy (T,U) tyinsts, insts) else raise MATCH
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   338
      | (Bound i, Bound j)  =>  if  i=j  then  instsp  else raise MATCH
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   339
      | (Abs(_,T,t), Abs(_,U,u))  =>
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   340
          mtch (typ_match thy (T,U) tyinsts, insts) (t,u)
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   341
      | (f$t, g$u) => mtch (mtch instsp (f,g)) (t, u)
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   342
      | (t, Abs(_,U,u))  =>  mtch instsp ((incr t)$(Bound 0), u)
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   343
      | _ => raise MATCH
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   344
  in fn tu => fn env => mtch env tu end;
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   345
8406
a217b0cd304d Type.unify and Type.typ_match now use Vartab instead of association lists.
berghofe
parents: 6539
diff changeset
   346
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   347
(* Matching of higher-order patterns *)
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   348
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   349
fun match_bind(itms,binders,ixn,T,is,t) =
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   350
  let val js = loose_bnos t
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   351
  in if null is
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   352
     then if null js then Vartab.update_new (ixn, (T, t)) itms else raise MATCH
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   353
     else if js subset_int is
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   354
          then let val t' = if downto0(is,length binders - 1) then t
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   355
                            else mapbnd (idx is) t
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   356
               in Vartab.update_new (ixn, (T, mkabs (binders, is, t'))) itms end
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   357
          else raise MATCH
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   358
  end;
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   359
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   360
fun match thy (po as (pat,obj)) envir =
678
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
   361
let
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   362
  (* Pre: pat and obj have same type *)
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   363
  fun mtch binders (pat,obj) (env as (iTs,itms)) =
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   364
    case pat of
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   365
      Abs(ns,Ts,ts) =>
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   366
        (case obj of
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   367
           Abs(nt,Tt,tt) => mtch ((nt,Tt)::binders) (ts,tt) env
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   368
         | _ => let val Tt = Envir.typ_subst_TVars iTs Ts
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   369
                in mtch((ns,Tt)::binders) (ts,(incr obj)$Bound(0)) env end)
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   370
    | _ => (case obj of
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   371
              Abs(nt,Tt,tt) =>
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   372
                mtch((nt,Tt)::binders) ((incr pat)$Bound(0),tt) env
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   373
            | _ => cases(binders,env,pat,obj))
678
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
   374
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   375
  and cases(binders,env as (iTs,itms),pat,obj) =
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   376
    let val (ph,pargs) = strip_comb pat
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   377
        fun rigrig1(iTs,oargs) = fold (mtch binders) (pargs~~oargs) (iTs,itms)
16668
fdb4992cf1d2 avoid polyeq;
wenzelm
parents: 16651
diff changeset
   378
        fun rigrig2((a:string,Ta),(b,Tb),oargs) =
fdb4992cf1d2 avoid polyeq;
wenzelm
parents: 16651
diff changeset
   379
              if a <> b then raise MATCH
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   380
              else rigrig1(typ_match thy (Ta,Tb) iTs, oargs)
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   381
    in case ph of
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   382
         Var(ixn,T) =>
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   383
           let val is = ints_of pargs
16651
40b96a501773 Changed interface of Envir.lookup'
berghofe
parents: 15797
diff changeset
   384
           in case Envir.lookup' (itms, (ixn, T)) of
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   385
                NONE => (iTs,match_bind(itms,binders,ixn,T,is,obj))
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   386
              | SOME u => if obj aeconv (red u is []) then env
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   387
                          else raise MATCH
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   388
           end
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   389
       | _ =>
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   390
           let val (oh,oargs) = strip_comb obj
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   391
           in case (ph,oh) of
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   392
                (Const c,Const d) => rigrig2(c,d,oargs)
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   393
              | (Free f,Free g)   => rigrig2(f,g,oargs)
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   394
              | (Bound i,Bound j) => if i<>j then raise MATCH
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   395
                                     else rigrig1(iTs,oargs)
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   396
              | (Abs _, _)        => raise Pattern
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   397
              | (_, Abs _)        => raise Pattern
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   398
              | _                 => raise MATCH
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   399
           end
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   400
    end;
678
6151b7f3b606 Modified pattern.ML to perform proper matching of Higher-Order Patterns.
nipkow
parents: 63
diff changeset
   401
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   402
  val pT = fastype_of pat
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   403
  and oT = fastype_of obj
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   404
  val envir' = apfst (typ_match thy (pT, oT)) envir;
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   405
in mtch [] po envir' handle Pattern => first_order_match thy po envir' end;
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   406
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   407
fun matches thy po = (match thy po (Vartab.empty, Vartab.empty); true) handle MATCH => false;
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   408
19880
1b0d48257caf added equiv;
wenzelm
parents: 19863
diff changeset
   409
fun equiv thy (t, u) = matches thy (t, u) andalso matches thy (u, t);
1b0d48257caf added equiv;
wenzelm
parents: 19863
diff changeset
   410
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   411
4667
6328d427a339 Tried to reorganize rewriter a little. More to be done.
nipkow
parents: 2792
diff changeset
   412
(* Does pat match a subterm of obj? *)
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   413
fun matches_subterm thy (pat,obj) =
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   414
  let fun msub(bounds,obj) = matches thy (pat,obj) orelse
17756
d4a35f82fbb4 minor tweaks for Poplog/ML;
wenzelm
parents: 17412
diff changeset
   415
            (case obj of
20079
ec5c8584487c replaced Term.variant(list) by Name.variant(_list);
wenzelm
parents: 19880
diff changeset
   416
              Abs(x,T,t) => let val y = Name.variant bounds x
4667
6328d427a339 Tried to reorganize rewriter a little. More to be done.
nipkow
parents: 2792
diff changeset
   417
                                val f = Free(":" ^ y,T)
6328d427a339 Tried to reorganize rewriter a little. More to be done.
nipkow
parents: 2792
diff changeset
   418
                            in msub(x::bounds,subst_bound(f,t)) end
6328d427a339 Tried to reorganize rewriter a little. More to be done.
nipkow
parents: 2792
diff changeset
   419
            | s$t => msub(bounds,s) orelse msub(bounds,t)
17756
d4a35f82fbb4 minor tweaks for Poplog/ML;
wenzelm
parents: 17412
diff changeset
   420
            | _ => false)
4667
6328d427a339 Tried to reorganize rewriter a little. More to be done.
nipkow
parents: 2792
diff changeset
   421
  in msub([],obj) end;
6328d427a339 Tried to reorganize rewriter a little. More to be done.
nipkow
parents: 2792
diff changeset
   422
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   423
fun first_order(Abs(_,_,t)) = first_order t
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   424
  | first_order(t $ u) = first_order t andalso first_order u andalso
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   425
                         not(is_Var t)
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   426
  | first_order _ = true;
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   427
20672
b96394d8c702 member (op =);
wenzelm
parents: 20098
diff changeset
   428
fun pattern (Abs (_, _, t)) = pattern t
b96394d8c702 member (op =);
wenzelm
parents: 20098
diff changeset
   429
  | pattern t =
b96394d8c702 member (op =);
wenzelm
parents: 20098
diff changeset
   430
      let val (head, args) = strip_comb t in
b96394d8c702 member (op =);
wenzelm
parents: 20098
diff changeset
   431
        if is_Var head then
b96394d8c702 member (op =);
wenzelm
parents: 20098
diff changeset
   432
          forall is_Bound args andalso not (has_duplicates (op aconv) args)
b96394d8c702 member (op =);
wenzelm
parents: 20098
diff changeset
   433
        else forall pattern args
b96394d8c702 member (op =);
wenzelm
parents: 20098
diff changeset
   434
      end;
4820
8f6dbbd8d497 Tried to speed up the rewriter by eta-contracting all patterns beforehand and
nipkow
parents: 4667
diff changeset
   435
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   436
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   437
(* rewriting -- simple but fast *)
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   438
17203
29b2563f5c11 refer to theory instead of low-level tsig;
wenzelm
parents: 16986
diff changeset
   439
fun rewrite_term thy rules procs tm =
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   440
  let
13195
98975cc13d28 Changes to rewrite_term:
berghofe
parents: 12980
diff changeset
   441
    val skel0 = Bound 0;
98975cc13d28 Changes to rewrite_term:
berghofe
parents: 12980
diff changeset
   442
16939
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   443
    fun variant_absfree bounds (x, T, t) =
12797
4de06a8f67ef eta_contract with sharing (by berghofe);
wenzelm
parents: 12784
diff changeset
   444
      let
20079
ec5c8584487c replaced Term.variant(list) by Name.variant(_list);
wenzelm
parents: 19880
diff changeset
   445
        val (x', t') = Term.dest_abs (Name.bound bounds, T, t);
16939
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   446
        fun abs u = Abs (x, T, abstract_over (Free (x', T), u));
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   447
      in (abs, t') end;
12797
4de06a8f67ef eta_contract with sharing (by berghofe);
wenzelm
parents: 12784
diff changeset
   448
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   449
    fun match_rew tm (tm1, tm2) =
18940
d8e12bf337a3 moved (beta_)eta_contract to envir.ML;
wenzelm
parents: 18182
diff changeset
   450
      let val rtm = the_default tm2 (Term.rename_abs tm1 tm tm2) in
18182
786d83044780 tuned interfaces to support incremental match/unify (cf. versions in type.ML);
wenzelm
parents: 18011
diff changeset
   451
        SOME (Envir.subst_vars (match thy (tm1, tm) (Vartab.empty, Vartab.empty)) rtm, rtm)
16939
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   452
          handle MATCH => NONE
13195
98975cc13d28 Changes to rewrite_term:
berghofe
parents: 12980
diff changeset
   453
      end;
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   454
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   455
    fun rew (Abs (_, _, body) $ t) = SOME (subst_bound (t, body), skel0)
13195
98975cc13d28 Changes to rewrite_term:
berghofe
parents: 12980
diff changeset
   456
      | rew tm = (case get_first (match_rew tm) rules of
15570
8d8c70b41bab Move towards standard functions.
skalberg
parents: 15531
diff changeset
   457
          NONE => Option.map (rpair skel0) (get_first (fn p => p tm) procs)
13195
98975cc13d28 Changes to rewrite_term:
berghofe
parents: 12980
diff changeset
   458
        | x => x);
98975cc13d28 Changes to rewrite_term:
berghofe
parents: 12980
diff changeset
   459
16939
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   460
    fun rew1 bounds (Var _) _ = NONE
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   461
      | rew1 bounds skel tm = (case rew2 bounds skel tm of
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   462
          SOME tm1 => (case rew tm1 of
18940
d8e12bf337a3 moved (beta_)eta_contract to envir.ML;
wenzelm
parents: 18182
diff changeset
   463
              SOME (tm2, skel') => SOME (the_default tm2 (rew1 bounds skel' tm2))
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   464
            | NONE => SOME tm1)
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   465
        | NONE => (case rew tm of
18940
d8e12bf337a3 moved (beta_)eta_contract to envir.ML;
wenzelm
parents: 18182
diff changeset
   466
              SOME (tm1, skel') => SOME (the_default tm1 (rew1 bounds skel' tm1))
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   467
            | NONE => NONE))
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   468
16939
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   469
    and rew2 bounds skel (tm1 $ tm2) = (case tm1 of
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   470
            Abs (_, _, body) =>
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   471
              let val tm' = subst_bound (tm2, body)
18940
d8e12bf337a3 moved (beta_)eta_contract to envir.ML;
wenzelm
parents: 18182
diff changeset
   472
              in SOME (the_default tm' (rew2 bounds skel0 tm')) end
14787
724ce6e574e3 adapted tsig interface;
wenzelm
parents: 14643
diff changeset
   473
          | _ =>
13195
98975cc13d28 Changes to rewrite_term:
berghofe
parents: 12980
diff changeset
   474
            let val (skel1, skel2) = (case skel of
98975cc13d28 Changes to rewrite_term:
berghofe
parents: 12980
diff changeset
   475
                skel1 $ skel2 => (skel1, skel2)
98975cc13d28 Changes to rewrite_term:
berghofe
parents: 12980
diff changeset
   476
              | _ => (skel0, skel0))
16939
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   477
            in case rew1 bounds skel1 tm1 of
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   478
                SOME tm1' => (case rew1 bounds skel2 tm2 of
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   479
                    SOME tm2' => SOME (tm1' $ tm2')
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   480
                  | NONE => SOME (tm1' $ tm2))
16939
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   481
              | NONE => (case rew1 bounds skel2 tm2 of
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   482
                    SOME tm2' => SOME (tm1 $ tm2')
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   483
                  | NONE => NONE)
13195
98975cc13d28 Changes to rewrite_term:
berghofe
parents: 12980
diff changeset
   484
            end)
16939
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   485
      | rew2 bounds skel (Abs body) =
13195
98975cc13d28 Changes to rewrite_term:
berghofe
parents: 12980
diff changeset
   486
          let
16939
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   487
            val (abs, tm') = variant_absfree bounds body;
13195
98975cc13d28 Changes to rewrite_term:
berghofe
parents: 12980
diff changeset
   488
            val skel' = (case skel of Abs (_, _, skel') => skel' | _ => skel0)
16939
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   489
          in case rew1 (bounds + 1) skel' tm' of
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   490
              SOME tm'' => SOME (abs tm'')
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14981
diff changeset
   491
            | NONE => NONE
12797
4de06a8f67ef eta_contract with sharing (by berghofe);
wenzelm
parents: 12784
diff changeset
   492
          end
16939
87fc64d2409f Sign.typ_unify;
wenzelm
parents: 16668
diff changeset
   493
      | rew2 _ _ _ = NONE;
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   494
18940
d8e12bf337a3 moved (beta_)eta_contract to envir.ML;
wenzelm
parents: 18182
diff changeset
   495
  in the_default tm (rew1 0 skel0 tm) end;
12784
bab3b002cbbb added rewrite_term;
wenzelm
parents: 12781
diff changeset
   496
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   497
end;
13642
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
   498
a3d97348ceb6 added failure trace information to pattern unification
nipkow
parents: 13195
diff changeset
   499
val trace_unify_fail = Pattern.trace_unify_fail;