# HG changeset patch # User nipkow # Date 794654750 -3600 # Node ID 534955033ed2ad34211e0a01ba66ee1a24f8bfaf # Parent 621be7ec81d7530a23b21934493c0d001abb2f28 Added pretty-printing coments diff -r 621be7ec81d7 -r 534955033ed2 src/HOL/IMP/Hoare.thy --- a/src/HOL/IMP/Hoare.thy Tue Mar 07 15:00:34 1995 +0100 +++ b/src/HOL/IMP/Hoare.thy Wed Mar 08 10:25:50 1995 +0100 @@ -8,7 +8,42 @@ Hoare = Denotation + consts - spec:: "[state=>bool,com,state=>bool] => bool" ("{{(1_)}}/ (_)/ {{(1_)}}" 10) + spec :: "[state=>bool,com,state=>bool] => bool" +(* syntax "@spec" :: "[bool,com,bool] => bool" *) + ("{{(1_)}}/ (_)/ {{(1_)}}" 10) defs spec_def "spec P c Q == !s t. : C(c) --> P s --> Q t" end +(* Pretty-printing of assertions. + Not very helpful as long as programs are not pretty-printed. +ML + +local open Syntax + +fun is_loc a = let val ch = hd(explode a) + in ord "A" <= ord ch andalso ord ch <= ord "Z" end; + +fun tr(s$t,i) = tr(s,i)$tr(t,i) + | tr(Abs(x,T,u),i) = Abs(x,T,tr(u,i+1)) + | tr(t as Free(a,T),i) = if is_loc a then Bound(i) $ free(a) else t + | tr(t,_) = t; + +fun cond_tr(p) = Abs("",dummyT,tr(p,0)) + +fun spec_tr[p,c,q] = const"spec" $ cond_tr p $ c $ cond_tr q; + +fun tr'(t as (Bound j $ (u as Free(a,_))),i) = if i=j then u else t + | tr'(s$t,i) = tr'(s,i)$tr'(t,i) + | tr'(Abs(x,T,u),i) = Abs(x,T,tr'(u,i+1)) + | tr'(t,_) = t; + +fun spec_tr'[Abs(_,_,p),c,Abs(_,_,q)] = + const"@spec" $ tr'(p,0) $ c $ tr'(q,0); + +in + +val parse_translation = [("@spec", spec_tr)]; +val print_translation = [("spec", spec_tr')]; + +end +*)