/usr/share/hol88-2.02.19940316/contrib/Tarski/curry.ml is in hol88-contrib-source 2.02.19940316-35.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | %----- -*- Emacs Mode: fundamental -*- -------------------------------
File: curry.ml
Author: (c) Kim Dam Petersen, 1991.
Date: 8/8-1991.
Description:
Defines operations for manipulating curried abstraction
Usage:
loadt`curry`;;
---------------------------------------------------------------------%
%<
mk_uncurry_abs "(x1,...,xn)" t
--> "UNCURRY \x1. UNCURRY \x2. ... UNCURRY \xn-1 xn. t"
== "\(x1, ... ,xn). t"
>%
letrec mk_uncurry_abs (x,tm) =
if is_pair x then
let
(x1,xv) = dest_pair x
in
"UNCURRY ^(mk_abs(x1, mk_uncurry_abs (xv,tm)))"
else
mk_abs(x,tm);;
%<
list_mk_uncurry_abs ["(x11,...,x1n1)";...;"(xm1,...,xmnm)"] t
--> "\(x11,...,x1n1)...(xm1,...,xmnm). t"
>%
letrec list_mk_uncurry_abs (xv,tm) =
(case xv of
[]. tm
|(x.xv). mk_uncurry_abs (x,(list_mk_uncurry_abs(xv,tm))));;
%<
dest_uncurry_abs "\(x1,...,xn). t"
--> ("(x1,...,xn)",t)
>%
letrec dest_uncurry_abs tm =
if is_abs tm then
let (x,t) = dest_abs tm in (x,t)
else
let (unc,abs) = dest_comb tm in
let (x,t) = dest_abs abs in
let (xp,t) = dest_uncurry_abs t in
if (fst(dest_const(unc)) = `UNCURRY`) then
(mk_pair(x,xp),t)
else
failwith `dest_uncurry_abs`;;
%<
strip_uncurry_abs "\(x11,...,x1n1) ... (xm1,...,xmnm). t"
--> ("[(x11,...,x1n1);...;(xm1,...,xmnm)]",t)
>%
letrec strip_uncurry_abs tm =
(let
(xp,t) = dest_uncurry_abs tm
in let
(xv,t) = strip_uncurry_abs t
in
((xp.xv),t)) ? ([],tm);;
%<
UNCURRY_BETA_CONV "(\(x1,...,xn). P)(y1,...,yn)" -->
|- (\(x1,...,xn). P)(y1,...,yn) = P[x1,...,xn\y1,...,yn]
>%
let UNCURRY_BETA_CONV =
set_fail_prefix `UNCURRY_BETA_CONV`
(\tm.
%< ucb "(\(x1,x2,...,xn). P)(y1,...,yn)" -->
|-"(\(x1,x2,...,xn). P)(y1,...,yn)
= (\(x2,...,xn). P[x1\y1])(y2,...yn) iff n>2
= P[x1,x2\y1,y2] iff n=2
>%
let
uncurry_beta_conv tm =
let once_beta_rule = CONV_RULE (ONCE_DEPTH_CONV BETA_CONV) in
let (f,yp) = dest_comb tm in
let fn = snd(dest_comb f) and
(xp,b) = dest_uncurry_abs f in
let (x1,x2) = dest_pair xp and
(y1,y2) = dest_pair yp in
let thm1 = ISPECL [fn;y1;y2] UNCURRY_DEF in
if (is_pair x2) then
once_beta_rule thm1
else
once_beta_rule (once_beta_rule thm1) in
let
(x,yv) = dest_comb tm
in let
(xp,b) = dest_uncurry_abs x
in
if not (is_pair xp) then fail else
letrec ubc tm =
let eq1thm = uncurry_beta_conv tm in
let eq2thm = ([ubc (snd(dest_eq(concl eq1thm)))] ? [])
in
if eq2thm = [] then eq1thm else TRANS eq1thm (hd eq2thm)
in ubc tm);;
let UNCURRY_BETA_TAC = CONV_TAC (DEPTH_CONV UNCURRY_BETA_CONV);;
%< mk_fun_type (dtp,rtp) --> ":dtp -> rtp"
dest_fun_type ":dtp -> rtp" --> (dt,prtp)
>%
let mk_fun_type (dtp,rtp) = mk_type(`fun`,[dtp;rtp]);;
let dest_fun_type =
set_fail `dest_fun_type`
(\tp.
let (f,[dtp;rtp]) = dest_type tp
in
if f = `fun` then (dtp,rtp) else fail);;
%< list_mk_fun_type [dt1;...;dtn] rt = ":dt1 -> ... -> dtn -> rt"
strip_fun_type [dt1;...;dtn] rt = ":dt1 -> ... -> dtn -> rt"
>%
let list_mk_fun_type (dtl,rt) = itlist (curry mk_fun_type) dtl rt;;
letrec strip_fun_type tp =
(let (dt,rt) = dest_fun_type tp in
let (dtl,rt') = strip_fun_type rt
in ((dt.dtl),rt')) ? ([],tp);;
%<
CURRY_EQUIV_RULE "f:(t1#...#tn)->t" ["x1";...;"xn"] |- P[f]
--> |- P[\(x1,...,xn). f x1 ... xn]
>%
%< Still has to be finished????
let CURRY_EQUIV_RULE =
set_fail_prefix `CURRY_EQUIV_RULE`
(\uf xl P.
let xtl = map type_of xl in
let ufrt = snd(dest_fun_type(type_of uf)) in
let cf = mk_var(fst(dest_var uf), list_mk_fun_type(xtl,ufrt)) in
let aucf = mk_uncurry_abs(list_mk_pair xtl, list_mk_comb(cf,xtl)) ;;
let thm1 = SPEC ucf (GEN (f,f) P) in
$$$ ) ;;
>%
|