src/Provers/eqsubst.ML
author dixon
Sun, 11 Jun 2006 00:28:18 +0200
changeset 19835 81d6dc597559
parent 19473 d87a8838afa4
child 19861 620d90091788
permissions -rw-r--r--
added updated version of IsaPlanner and substitution.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
     1
(*  Title:      Provers/eqsubst.ML
16434
d17817dd61e9 added Id;
wenzelm
parents: 16007
diff changeset
     2
    ID:         $Id$
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
     3
    Author:     Lucas Dixon, University of Edinburgh, lucas.dixon@ed.ac.uk
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
     4
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
     5
A proof method to perform a substiution using an equation.
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
     6
*)
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
     7
18591
04b9f2bf5a48 tuned EqSubst setup;
wenzelm
parents: 18011
diff changeset
     8
signature EQSUBST =
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
     9
sig
18708
4b3dadb4fe33 setup: theory -> theory;
wenzelm
parents: 18598
diff changeset
    10
  val setup : theory -> theory
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
    11
end;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
    12
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    13
structure EqSubst
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    14
(* : EQSUBST *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    15
= struct
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
    16
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    17
structure Z = Zipper;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    18
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    19
(* changes object "=" to meta "==" which prepares a given rewrite rule *)
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
    20
fun prep_meta_eq ctxt =
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
    21
  let val (_, {mk_rews = {mk, ...}, ...}) = Simplifier.rep_ss (Simplifier.local_simpset_of ctxt)
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
    22
  in mk #> map Drule.zero_var_indexes end;
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
    23
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
    24
15915
b0e8b37642a4 lucas - improved interface to isand.ML and cleaned up clean-unification code, and added some better comments.
dixon
parents: 15855
diff changeset
    25
  (* a type abriviation for match information *)
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
    26
  type match =
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
    27
       ((indexname * (sort * typ)) list (* type instantiations *)
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
    28
        * (indexname * (typ * term)) list) (* term instantiations *)
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
    29
       * (string * typ) list (* fake named type abs env *)
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
    30
       * (string * typ) list (* type abs env *)
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
    31
       * term (* outer term *)
15550
806214035275 lucas - added more comments and an extra type to clarify the code.
dixon
parents: 15538
diff changeset
    32
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
    33
  type searchinfo =
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
    34
       theory
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
    35
       * int (* maxidx *)
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    36
       * Zipper.T (* focusterm to search under *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    37
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    38
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    39
(* skipping non-empty sub-sequences but when we reach the end
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    40
   of the seq, remembering how much we have left to skip. *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    41
datatype 'a skipseq = SkipMore of int
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    42
  | SkipSeq of 'a Seq.seq Seq.seq;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    43
(* given a seqseq, skip the first m non-empty seq's, note deficit *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    44
fun skipto_skipseq m s = 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    45
    let 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    46
      fun skip_occs n sq = 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    47
          case Seq.pull sq of 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    48
            NONE => SkipMore n
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    49
          | SOME (h,t) => 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    50
            (case Seq.pull h of NONE => skip_occs n t
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    51
             | SOME _ => if n <= 1 then SkipSeq (Seq.cons h t)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    52
                         else skip_occs (n - 1) t)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    53
    in (skip_occs m s) end;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    54
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    55
(* note: outerterm is the taget with the match replaced by a bound 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    56
         variable : ie: "P lhs" beocmes "%x. P x" 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    57
         insts is the types of instantiations of vars in lhs
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    58
         and typinsts is the type instantiations of types in the lhs
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    59
         Note: Final rule is the rule lifted into the ontext of the 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    60
         taget thm. *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    61
fun mk_foo_match mkuptermfunc Ts t = 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    62
    let 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    63
      val ty = Term.type_of t
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    64
      val bigtype = (rev (map snd Ts)) ---> ty
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    65
      fun mk_foo 0 t = t
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    66
        | mk_foo i t = mk_foo (i - 1) (t $ (Bound (i - 1)))
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    67
      val num_of_bnds = (length Ts)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    68
      (* foo_term = "fooabs y0 ... yn" where y's are local bounds *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    69
      val foo_term = mk_foo num_of_bnds (Bound num_of_bnds)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    70
    in Abs("fooabs", bigtype, mkuptermfunc foo_term) end;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    71
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    72
(* T is outer bound vars, n is number of locally bound vars *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    73
(* THINK: is order of Ts correct...? or reversed? *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    74
fun fakefree_badbounds Ts t = 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    75
    let val (FakeTs,Ts,newnames) = 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    76
            List.foldr (fn ((n,ty),(FakeTs,Ts,usednames)) => 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    77
                           let val newname = Term.variant usednames n
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    78
                           in ((RWTools.mk_fake_bound_name newname,ty)::FakeTs,
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    79
                               (newname,ty)::Ts, 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    80
                               newname::usednames) end)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    81
                       ([],[],[])
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    82
                       Ts
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    83
    in (FakeTs, Ts, Term.subst_bounds (map Free FakeTs, t)) end;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    84
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    85
(* before matching we need to fake the bound vars that are missing an
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    86
abstraction. In this function we additionally construct the
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    87
abstraction environment, and an outer context term (with the focus
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    88
abstracted out) for use in rewriting with RWInst.rw *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    89
fun prep_zipper_match z = 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    90
    let 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    91
      val t = Z.trm z  
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    92
      val c = Z.ctxt z
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    93
      val Ts = Z.C.nty_ctxt c
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    94
      val (FakeTs', Ts', t') = fakefree_badbounds Ts t
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    95
      val absterm = mk_foo_match (Z.C.apply c) Ts' t'
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    96
    in
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    97
      (t', (FakeTs', Ts', absterm))
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    98
    end;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
    99
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   100
(* Matching and Unification with exception handled *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   101
fun clean_match thy (a as (pat, t)) =
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   102
  let val (tyenv, tenv) = Pattern.match thy a (Vartab.empty, Vartab.empty)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   103
  in SOME (Vartab.dest tyenv, Vartab.dest tenv)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   104
  end handle Pattern.MATCH => NONE;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   105
(* given theory, max var index, pat, tgt; returns Seq of instantiations *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   106
fun clean_unify sgn ix (a as (pat, tgt)) =
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   107
    let
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   108
      (* type info will be re-derived, maybe this can be cached
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   109
         for efficiency? *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   110
      val pat_ty = Term.type_of pat;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   111
      val tgt_ty = Term.type_of tgt;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   112
      (* is it OK to ignore the type instantiation info?
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   113
         or should I be using it? *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   114
      val typs_unify =
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   115
          SOME (Sign.typ_unify sgn (pat_ty, tgt_ty) (Term.Vartab.empty, ix))
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   116
            handle Type.TUNIFY => NONE;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   117
    in
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   118
      case typs_unify of
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   119
        SOME (typinsttab, ix2) =>
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   120
        let
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   121
      (* is it right to throw away the flexes?
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   122
         or should I be using them somehow? *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   123
          fun mk_insts env =
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   124
            (Vartab.dest (Envir.type_env env),
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   125
             Envir.alist_of env);
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   126
          val initenv = Envir.Envir {asol = Vartab.empty,
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   127
                                     iTs = typinsttab, maxidx = ix2};
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   128
          val useq = (Unify.smash_unifiers (sgn,initenv,[a]))
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   129
	            handle UnequalLengths => Seq.empty
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   130
		               | Term.TERM _ => Seq.empty;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   131
          fun clean_unify' useq () =
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   132
              (case (Seq.pull useq) of
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   133
                 NONE => NONE
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   134
               | SOME (h,t) => SOME (mk_insts h, Seq.make (clean_unify' t)))
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   135
	      handle UnequalLengths => NONE
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   136
                   | Term.TERM _ => NONE;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   137
        in
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   138
          (Seq.make (clean_unify' useq))
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   139
        end
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   140
      | NONE => Seq.empty
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   141
    end;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   142
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   143
(* Matching and Unification for zippers *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   144
(* Note: Ts is a modified version of the original names of the outer
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   145
bound variables. New names have been introduced to make sure they are
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   146
unique w.r.t all names in the term and each other. usednames' is
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   147
oldnames + new names. *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   148
fun clean_match_z thy pat z = 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   149
    let val (t, (FakeTs,Ts,absterm)) = prep_zipper_match z in
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   150
      case clean_match thy (pat, t) of 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   151
        NONE => NONE 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   152
      | SOME insts => SOME (insts, FakeTs, Ts, absterm) end;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   153
(* ix = max var index *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   154
fun clean_unify_z sgn ix pat z = 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   155
    let val (t, (FakeTs, Ts,absterm)) = prep_zipper_match z in
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   156
    Seq.map (fn insts => (insts, FakeTs, Ts, absterm)) 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   157
            (clean_unify sgn ix (t, pat)) end;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   158
15550
806214035275 lucas - added more comments and an extra type to clarify the code.
dixon
parents: 15538
diff changeset
   159
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   160
(* FOR DEBUGGING...
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   161
type trace_subst_errT = int (* subgoal *)
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   162
        * thm (* thm with all goals *)
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   163
        * (Thm.cterm list (* certified free var placeholders for vars *)
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   164
           * thm)  (* trivial thm of goal concl *)
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   165
            (* possible matches/unifiers *)
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   166
        * thm (* rule *)
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   167
        * (((indexname * typ) list (* type instantiations *)
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   168
              * (indexname * term) list ) (* term instantiations *)
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   169
             * (string * typ) list (* Type abs env *)
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   170
             * term) (* outer term *);
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   171
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   172
val trace_subst_err = (ref NONE : trace_subst_errT option ref);
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   173
val trace_subst_search = ref false;
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   174
exception trace_subst_exp of trace_subst_errT;
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   175
*)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   176
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   177
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   178
fun bot_left_leaf_of (l $ r) = bot_left_leaf_of l
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   179
  | bot_left_leaf_of (Abs(s,ty,t)) = bot_left_leaf_of t
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   180
  | bot_left_leaf_of x = x;
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   181
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   182
fun valid_match_start z =
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   183
    (case bot_left_leaf_of (Z.trm z) of 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   184
       Const _ => true
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   185
     | Free _ => true
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   186
     | Abs _ => true (* allowed to look inside abs... search decides if we actually consider the abstraction itself *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   187
     | _ => false); (* avoid vars - always suceeds uninterestingly. *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   188
                      
15814
d65f461c8672 lucas - fixed a big with renaming of bound variables. Other small changes.
dixon
parents: 15550
diff changeset
   189
(* search from top, left to right, then down *)
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   190
val search_tlr_all = ZipperSearch.all_td_lr;
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   191
15814
d65f461c8672 lucas - fixed a big with renaming of bound variables. Other small changes.
dixon
parents: 15550
diff changeset
   192
(* search from top, left to right, then down *)
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   193
fun search_tlr_valid validf =
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   194
    let 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   195
      fun sf_valid_td_lr z = 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   196
          let val here = if validf z then [Z.Here z] else [] in
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   197
            case Z.trm z 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   198
             of _ $ _ => here @ [Z.LookIn (Z.move_down_left z),
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   199
                                 Z.LookIn (Z.move_down_right z)]
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   200
              | Abs _ => here @ [Z.LookIn (Z.move_down_abs z)]
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   201
              | _ => here
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   202
          end;
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   203
    in Z.lzy_search sf_valid_td_lr end;
15814
d65f461c8672 lucas - fixed a big with renaming of bound variables. Other small changes.
dixon
parents: 15550
diff changeset
   204
d65f461c8672 lucas - fixed a big with renaming of bound variables. Other small changes.
dixon
parents: 15550
diff changeset
   205
(* search all unifications *)
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   206
fun searchf_tlr_unify_all (sgn, maxidx, z) lhs =
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   207
    Seq.map (clean_unify_z sgn maxidx lhs) 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   208
            (Z.limit_apply search_tlr_all z);
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   209
15814
d65f461c8672 lucas - fixed a big with renaming of bound variables. Other small changes.
dixon
parents: 15550
diff changeset
   210
(* search only for 'valid' unifiers (non abs subterms and non vars) *)
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   211
fun searchf_tlr_unify_valid (sgn, maxidx, z) lhs  =
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   212
    Seq.map (clean_unify_z sgn maxidx lhs) 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   213
            (Z.limit_apply (search_tlr_valid valid_match_start) z);
15929
68bd1e16552a lucas - added option to select occurance to rewrite e.g. (occ 4)
dixon
parents: 15915
diff changeset
   214
15814
d65f461c8672 lucas - fixed a big with renaming of bound variables. Other small changes.
dixon
parents: 15550
diff changeset
   215
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   216
(* apply a substitution in the conclusion of the theorem th *)
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   217
(* cfvs are certified free var placeholders for goal params *)
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   218
(* conclthm is a theorem of for just the conclusion *)
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   219
(* m is instantiation/match information *)
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   220
(* rule is the equation for substitution *)
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   221
fun apply_subst_in_concl i th (cfvs, conclthm) rule m =
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   222
    (RWInst.rw m rule conclthm)
15855
55e443aa711d lucas - updated to reflect isand.ML update
dixon
parents: 15814
diff changeset
   223
      |> IsaND.unfix_frees cfvs
15915
b0e8b37642a4 lucas - improved interface to isand.ML and cleaned up clean-unification code, and added some better comments.
dixon
parents: 15855
diff changeset
   224
      |> RWInst.beta_eta_contract
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   225
      |> (fn r => Tactic.rtac r i th);
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   226
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   227
(* substitute within the conclusion of goal i of gth, using a meta
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   228
equation rule. Note that we assume rule has var indicies zero'd *)
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   229
fun prep_concl_subst i gth =
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   230
    let
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   231
      val th = Thm.incr_indexes 1 gth;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   232
      val tgt_term = Thm.prop_of th;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   233
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   234
      val sgn = Thm.sign_of_thm th;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   235
      val ctermify = Thm.cterm_of sgn;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   236
      val trivify = Thm.trivial o ctermify;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   237
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   238
      val (fixedbody, fvs) = IsaND.fix_alls_term i tgt_term;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   239
      val cfvs = rev (map ctermify fvs);
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   240
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   241
      val conclterm = Logic.strip_imp_concl fixedbody;
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   242
      val conclthm = trivify conclterm;
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   243
      val maxidx = Term.maxidx_of_term conclterm;
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   244
      val ft = ((Z.move_down_right (* ==> *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   245
                 o Z.move_down_left (* Trueprop *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   246
                 o Z.mktop
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   247
                 o Thm.prop_of) conclthm)
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   248
    in
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   249
      ((cfvs, conclthm), (sgn, maxidx, ft))
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   250
    end;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   251
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   252
(* substitute using an object or meta level equality *)
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   253
fun eqsubst_tac' ctxt searchf instepthm i th =
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   254
    let
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   255
      val (cvfsconclthm, searchinfo) = prep_concl_subst i th;
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   256
      val stepthms = Seq.of_list (prep_meta_eq ctxt instepthm);
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   257
      fun rewrite_with_thm r =
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   258
          let val (lhs,_) = Logic.dest_equals (Thm.concl_of r);
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   259
          in searchf searchinfo lhs
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   260
             |> Seq.maps (apply_subst_in_concl i th cvfsconclthm r) end;
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   261
    in stepthms |> Seq.maps rewrite_with_thm end;
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   262
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   263
19047
670ce193b618 used Tactic.distinct_subgoals_tac;
wenzelm
parents: 18988
diff changeset
   264
(* distinct subgoals *)
15959
366d39e95d3c lucas - fixed bug with uninstantiated type contexts in eqsubst and added the automatic removal of duplicate subgoals (when there are no flex-flex constraints)
dixon
parents: 15936
diff changeset
   265
fun distinct_subgoals th =
19047
670ce193b618 used Tactic.distinct_subgoals_tac;
wenzelm
parents: 18988
diff changeset
   266
  the_default th (SINGLE distinct_subgoals_tac th);
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   267
19047
670ce193b618 used Tactic.distinct_subgoals_tac;
wenzelm
parents: 18988
diff changeset
   268
(* General substitution of multiple occurances using one of
15936
817ac93ee786 lucas - added ability to provide multiple replacements for subst: syntax is now: subst (1 3) myrule
dixon
parents: 15929
diff changeset
   269
   the given theorems*)
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   270
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   271
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   272
exception eqsubst_occL_exp of
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   273
          string * (int list) * (thm list) * int * thm;
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   274
fun skip_first_occs_search occ srchf sinfo lhs =
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   275
    case (skipto_skipseq occ (srchf sinfo lhs)) of
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   276
      SkipMore _ => Seq.empty
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   277
    | SkipSeq ss => Seq.flat ss;
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   278
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   279
fun eqsubst_tac ctxt occL thms i th =
15936
817ac93ee786 lucas - added ability to provide multiple replacements for subst: syntax is now: subst (1 3) myrule
dixon
parents: 15929
diff changeset
   280
    let val nprems = Thm.nprems_of th in
817ac93ee786 lucas - added ability to provide multiple replacements for subst: syntax is now: subst (1 3) myrule
dixon
parents: 15929
diff changeset
   281
      if nprems < i then Seq.empty else
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   282
      let val thmseq = (Seq.of_list thms)
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   283
        fun apply_occ occ th =
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   284
            thmseq |> Seq.maps
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   285
                    (fn r => eqsubst_tac' 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   286
                               ctxt 
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   287
                               (skip_first_occs_search
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   288
                                  occ searchf_tlr_unify_valid) r
15936
817ac93ee786 lucas - added ability to provide multiple replacements for subst: syntax is now: subst (1 3) myrule
dixon
parents: 15929
diff changeset
   289
                                 (i + ((Thm.nprems_of th) - nprems))
817ac93ee786 lucas - added ability to provide multiple replacements for subst: syntax is now: subst (1 3) myrule
dixon
parents: 15929
diff changeset
   290
                                 th);
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   291
        val sortedoccL =
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   292
            Library.sort (Library.rev_order o Library.int_ord) occL;
15936
817ac93ee786 lucas - added ability to provide multiple replacements for subst: syntax is now: subst (1 3) myrule
dixon
parents: 15929
diff changeset
   293
      in
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   294
        Seq.map distinct_subgoals (Seq.EVERY (map apply_occ sortedoccL) th)
15936
817ac93ee786 lucas - added ability to provide multiple replacements for subst: syntax is now: subst (1 3) myrule
dixon
parents: 15929
diff changeset
   295
      end
15959
366d39e95d3c lucas - fixed bug with uninstantiated type contexts in eqsubst and added the automatic removal of duplicate subgoals (when there are no flex-flex constraints)
dixon
parents: 15936
diff changeset
   296
    end
366d39e95d3c lucas - fixed bug with uninstantiated type contexts in eqsubst and added the automatic removal of duplicate subgoals (when there are no flex-flex constraints)
dixon
parents: 15936
diff changeset
   297
    handle THM _ => raise eqsubst_occL_exp ("THM",occL,thms,i,th);
366d39e95d3c lucas - fixed bug with uninstantiated type contexts in eqsubst and added the automatic removal of duplicate subgoals (when there are no flex-flex constraints)
dixon
parents: 15936
diff changeset
   298
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   299
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   300
(* inthms are the given arguments in Isar, and treated as eqstep with
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   301
   the first one, then the second etc *)
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   302
fun eqsubst_meth ctxt occL inthms =
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   303
    Method.METHOD
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   304
      (fn facts =>
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   305
          HEADGOAL (Method.insert_tac facts THEN' eqsubst_tac ctxt occL inthms));
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   306
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   307
(* apply a substitution inside assumption j, keeps asm in the same place *)
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   308
fun apply_subst_in_asm i th rule ((cfvs, j, ngoalprems, pth),m) =
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   309
    let
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   310
      val th2 = Thm.rotate_rule (j - 1) i th; (* put premice first *)
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   311
      val preelimrule =
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   312
          (RWInst.rw m rule pth)
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   313
            |> (Seq.hd o Tactic.prune_params_tac)
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   314
            |> Thm.permute_prems 0 ~1 (* put old asm first *)
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   315
            |> IsaND.unfix_frees cfvs (* unfix any global params *)
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   316
            |> RWInst.beta_eta_contract; (* normal form *)
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   317
  (*    val elimrule =
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   318
          preelimrule
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   319
            |> Tactic.make_elim (* make into elim rule *)
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   320
            |> Thm.lift_rule (th2, i); (* lift into context *)
16007
4dcccaa11a13 lucas - bugfix to subst in assumptions: fixed index error for conditional rules.
dixon
parents: 16004
diff changeset
   321
   *)
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   322
    in
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   323
      (* ~j because new asm starts at back, thus we subtract 1 *)
16007
4dcccaa11a13 lucas - bugfix to subst in assumptions: fixed index error for conditional rules.
dixon
parents: 16004
diff changeset
   324
      Seq.map (Thm.rotate_rule (~j) ((Thm.nprems_of rule) + i))
4dcccaa11a13 lucas - bugfix to subst in assumptions: fixed index error for conditional rules.
dixon
parents: 16004
diff changeset
   325
      (Tactic.dtac preelimrule i th2)
4dcccaa11a13 lucas - bugfix to subst in assumptions: fixed index error for conditional rules.
dixon
parents: 16004
diff changeset
   326
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   327
      (* (Thm.bicompose
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   328
                 false (* use unification *)
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   329
                 (true, (* elim resolution *)
16007
4dcccaa11a13 lucas - bugfix to subst in assumptions: fixed index error for conditional rules.
dixon
parents: 16004
diff changeset
   330
                  elimrule, (2 + (Thm.nprems_of rule)) - ngoalprems)
4dcccaa11a13 lucas - bugfix to subst in assumptions: fixed index error for conditional rules.
dixon
parents: 16004
diff changeset
   331
                 i th2) *)
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   332
    end;
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   333
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   334
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   335
(* prepare to substitute within the j'th premise of subgoal i of gth,
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   336
using a meta-level equation. Note that we assume rule has var indicies
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   337
zero'd. Note that we also assume that premt is the j'th premice of
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   338
subgoal i of gth. Note the repetition of work done for each
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   339
assumption, i.e. this can be made more efficient for search over
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   340
multiple assumptions.  *)
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   341
fun prep_subst_in_asm i gth j =
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   342
    let
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   343
      val th = Thm.incr_indexes 1 gth;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   344
      val tgt_term = Thm.prop_of th;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   345
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   346
      val sgn = Thm.sign_of_thm th;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   347
      val ctermify = Thm.cterm_of sgn;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   348
      val trivify = Thm.trivial o ctermify;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   349
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   350
      val (fixedbody, fvs) = IsaND.fix_alls_term i tgt_term;
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   351
      val cfvs = rev (map ctermify fvs);
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   352
18011
685d95c793ff cleaned up nth, nth_update, nth_map and nth_string functions
haftmann
parents: 17795
diff changeset
   353
      val asmt = nth (Logic.strip_imp_prems fixedbody) (j - 1);
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   354
      val asm_nprems = length (Logic.strip_imp_prems asmt);
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   355
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   356
      val pth = trivify asmt;
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   357
      val maxidx = Term.maxidx_of_term asmt;
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   358
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   359
      val ft = ((Z.move_down_right (* trueprop *)
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   360
                 o Z.mktop
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   361
                 o Thm.prop_of) pth)
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   362
    in ((cfvs, j, asm_nprems, pth), (sgn, maxidx, ft)) end;
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   363
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   364
(* prepare subst in every possible assumption *)
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   365
fun prep_subst_in_asms i gth =
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   366
    map (prep_subst_in_asm i gth)
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   367
        ((fn l => Library.upto (1, length l))
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   368
           (Logic.prems_of_goal (Thm.prop_of gth) i));
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   369
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   370
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   371
(* substitute in an assumption using an object or meta level equality *)
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   372
fun eqsubst_asm_tac' ctxt searchf skipocc instepthm i th =
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   373
    let
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   374
      val asmpreps = prep_subst_in_asms i th;
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   375
      val stepthms = Seq.of_list (prep_meta_eq ctxt instepthm);
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   376
      fun rewrite_with_thm r =
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   377
          let val (lhs,_) = Logic.dest_equals (Thm.concl_of r)
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   378
            fun occ_search occ [] = Seq.empty
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   379
              | occ_search occ ((asminfo, searchinfo)::moreasms) =
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   380
                (case searchf searchinfo occ lhs of
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   381
                   SkipMore i => occ_search i moreasms
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   382
                 | SkipSeq ss =>
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   383
                   Seq.append (Seq.map (Library.pair asminfo)
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   384
                                       (Seq.flat ss),
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   385
                               occ_search 1 moreasms))
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   386
                              (* find later substs also *)
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   387
          in
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   388
            occ_search skipocc asmpreps |> Seq.maps (apply_subst_in_asm i th r)
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   389
          end;
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   390
    in stepthms |> Seq.maps rewrite_with_thm end;
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   391
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   392
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   393
fun skip_first_asm_occs_search searchf sinfo occ lhs =
19835
81d6dc597559 added updated version of IsaPlanner and substitution.
dixon
parents: 19473
diff changeset
   394
    skipto_skipseq occ (searchf sinfo lhs);
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   395
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   396
fun eqsubst_asm_tac ctxt occL thms i th =
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   397
    let val nprems = Thm.nprems_of th
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   398
    in
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   399
      if nprems < i then Seq.empty else
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   400
      let val thmseq = (Seq.of_list thms)
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   401
        fun apply_occ occK th =
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   402
            thmseq |> Seq.maps
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   403
                    (fn r =>
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   404
                        eqsubst_asm_tac' ctxt (skip_first_asm_occs_search
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   405
                                            searchf_tlr_unify_valid) occK r
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   406
                                         (i + ((Thm.nprems_of th) - nprems))
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   407
                                         th);
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   408
        val sortedoccs =
16004
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   409
            Library.sort (Library.rev_order o Library.int_ord) occL
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   410
      in
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   411
        Seq.map distinct_subgoals
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   412
                (Seq.EVERY (map apply_occ sortedoccs) th)
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   413
      end
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   414
    end
031f56012483 lucas - fixed subst in assumptions to count redexes from left to right.
dixon
parents: 15959
diff changeset
   415
    handle THM _ => raise eqsubst_occL_exp ("THM",occL,thms,i,th);
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   416
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   417
(* inthms are the given arguments in Isar, and treated as eqstep with
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   418
   the first one, then the second etc *)
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   419
fun eqsubst_asm_meth ctxt occL inthms =
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   420
    Method.METHOD
15538
d8edf54cc28c lucas - re-arranged code and added comments. Also added check to make sure the subgoal that we are being applied to exists. If it does not, empty seq is returned.
dixon
parents: 15486
diff changeset
   421
      (fn facts =>
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   422
          HEADGOAL (Method.insert_tac facts THEN' eqsubst_asm_tac ctxt occL inthms ));
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   423
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   424
(* syntax for options, given "(asm)" will give back true, without
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   425
   gives back false *)
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   426
val options_syntax =
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   427
    (Args.parens (Args.$$$ "asm") >> (K true)) ||
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   428
     (Scan.succeed false);
15936
817ac93ee786 lucas - added ability to provide multiple replacements for subst: syntax is now: subst (1 3) myrule
dixon
parents: 15929
diff changeset
   429
15929
68bd1e16552a lucas - added option to select occurance to rewrite e.g. (occ 4)
dixon
parents: 15915
diff changeset
   430
val ith_syntax =
15936
817ac93ee786 lucas - added ability to provide multiple replacements for subst: syntax is now: subst (1 3) myrule
dixon
parents: 15929
diff changeset
   431
    (Args.parens (Scan.repeat Args.nat))
817ac93ee786 lucas - added ability to provide multiple replacements for subst: syntax is now: subst (1 3) myrule
dixon
parents: 15929
diff changeset
   432
      || (Scan.succeed [0]);
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   433
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   434
(* combination method that takes a flag (true indicates that subst
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   435
should be done to an assumption, false = apply to the conclusion of
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   436
the goal) as well as the theorems to use *)
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   437
fun subst_meth src =
18988
d6e5fa2ba8b8 Args/Attrib syntax: Context.generic;
wenzelm
parents: 18833
diff changeset
   438
  Method.syntax ((Scan.lift options_syntax) -- (Scan.lift ith_syntax) -- Attrib.thms) src
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   439
  #> (fn (ctxt, ((asmflag, occL), inthms)) =>
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   440
    (if asmflag then eqsubst_asm_meth else eqsubst_meth) ctxt occL inthms);
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   441
18598
94d658871c98 prep_meta_eq: reuse mk_rews of local simpset;
wenzelm
parents: 18591
diff changeset
   442
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   443
val setup =
18833
bead1a4e966b tuned comment;
wenzelm
parents: 18708
diff changeset
   444
  Method.add_method ("subst", subst_meth, "single-step substitution");
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents:
diff changeset
   445
16978
e35b518bffc9 tuned signature;
wenzelm
parents: 16434
diff changeset
   446
end;