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|
(* pp.sml
* 2005 Matthew Fluet (mfluet@acm.org)
* Adapted for MLton.
*)
(*
* pp.sml - Some simple pretty-printing infrastructure for the ml-ffigen
* program.
*
* (C) 2001, Lucent Technologies, Bell Labs
*
* author: Matthias Blume (blume@research.bell-labs.com)
*)
structure PrettyPrint = struct
structure PP = PPStreamFn (structure Token = StringToken
structure Device = CPIFDev)
datatype mltype =
ARROW of mltype * mltype
| TUPLE of mltype list
| CON of string * mltype list
| RECORD of (string * mltype) list
val Unit = TUPLE []
fun Type t = CON (t, [])
fun St tag = Type (concat ["ST_", tag, ".tag"])
fun Un tag = Type (concat ["UT_", tag, ".tag"])
fun En tag = Type (concat ["ET_", tag, ".tag"])
datatype tcontext = C_STAR | C_ARROW | C_COMMA | C_CON
fun simplify (CON ("unit", [])) = Unit
| simplify (TUPLE [t]) = simplify t
| simplify (CON (k, tl)) =
let
fun doDefault () = CON (k, map simplify tl)
fun doObj obj =
case tl of
[CON (k, tl), c] =>
if List.exists (fn k' => k = k')
["schar","uchar","sshort","ushort",
"sint","uint","slong","ulong",
"slonglong","ulonglong","float","double",
"voidptr"]
then CON (concat [k, "_", obj], [simplify c])
else if k = "fptr"
then case tl of
[f] => CON ("fptr_" ^ obj, [simplify f, simplify c])
| _ => doDefault ()
else if k = "su"
then case tl of
[su] => CON ("su_" ^ obj, [simplify su, simplify c])
| _ => doDefault ()
else doDefault ()
| _ => doDefault ()
fun doDim d =
if d = "dim"
then case tl of
[n, CON (k', [])] =>
if k' = "Dim.nonzero" orelse k' = "nonzero"
then CON ("dim", [simplify n])
else doDefault ()
| _ => doDefault ()
else if d = "dec"
then case tl of
[] => CON ("dec", [])
| _ => doDefault ()
else if List.exists (fn d' => d = d')
["dg0","dg1","dg2","dg3","dg4",
"dg5","dg6","dg7","dg8","dg9"]
then case tl of
[n] => CON (d, [simplify n])
| _ => doDefault ()
else doDefault ()
in
if k = "obj" orelse k = "obj'"
then doObj k
else if String.isPrefix "Dim." k
then doDim (String.extract(k,4,NONE))
else doDefault ()
end
| simplify (ARROW (t1, t2)) = ARROW (simplify t1, simplify t2)
| simplify (TUPLE tl) = TUPLE (map simplify tl)
| simplify (RECORD ml) = RECORD (map (fn (n, t) => (n, simplify t)) ml)
fun ppType0 s (t as ARROW _, c) =
let fun loop (ARROW (x, y)) =
(ppType0 s (x, C_ARROW); PP.string s " ->"; PP.space s 1;
loop y)
| loop t = ppType0 s (t, C_ARROW)
val paren = not (c = C_COMMA)
val indent = if paren then 5 else 4
in
PP.openHOVBox s (PP.Rel indent);
if paren then PP.string s "(" else ();
loop t;
if paren then PP.string s ")" else ();
PP.closeBox s
end
| ppType0 s (TUPLE [], _) = PP.string s "unit"
| ppType0 s (TUPLE [t], c) = ppType0 s (t, c)
| ppType0 s (TUPLE tl, c) = let
fun loop [] = () (* cannot happen *)
| loop [t] = ppType0 s (t, C_STAR)
| loop (h :: tl) = (ppType0 s (h, C_STAR);
PP.string s " *";
PP.space s 1;
loop tl)
val paren =
case c of (C_STAR) => true
| (C_CON) => true
| (C_ARROW) => false
| (C_COMMA) => false
val indent = if paren then 1 else 0
in
PP.openHVBox s (PP.Rel indent);
if paren then PP.string s "(" else ();
loop tl;
if paren then PP.string s ")" else ();
PP.closeBox s
end
| ppType0 s (RECORD [], _) = PP.string s "{}"
| ppType0 s (RECORD tl, _) = let
fun loop [] = () (* cannot happen *)
| loop [(n, t)] = (PP.string s (n ^ " : ");
ppType0 s (t, C_COMMA))
| loop ((n, t) :: tl) = (PP.string s (n ^ " : ");
ppType0 s (t, C_COMMA);
PP.string s ",";
PP.space s 1;
loop tl)
in
PP.openHVBox s (PP.Rel 2);
PP.string s "{ ";
loop tl;
PP.string s " }";
PP.closeBox s
end
| ppType0 s (CON (k, []), _) = PP.string s k
| ppType0 s (CON (k, [t]), _) =
(PP.openHBox s;
ppType0 s (t, C_CON);
PP.space s 1;
PP.string s k;
PP.closeBox s)
| ppType0 s (CON (k, tl), _) = let
fun loop [] = () (* cannot happen *)
| loop [t] = ppType0 s (t, C_COMMA)
| loop (h :: tl) =
(ppType0 s (h, C_COMMA); PP.string s ","; PP.space s 1; loop tl)
in
PP.openHBox s;
PP.openHVBox s (PP.Rel 1);
PP.string s "(";
loop tl;
PP.string s ")";
PP.closeBox s;
PP.space s 1;
PP.string s k;
PP.closeBox s
end
(* start with comma context *)
fun ppType s t = ppType0 s (simplify t, C_COMMA)
fun ppType' s (t, c) = ppType0 s (simplify t, c)
datatype mlexp =
ETUPLE of mlexp list
| ERECORD of (string * mlexp) list
| EVAR of string
| EAPP of mlexp * mlexp
| ECONSTR of mlexp * mltype
| ESEQ of mlexp * mlexp
| EPRIM of string * mltype
| ELET of (string * mlexp) list * mlexp
datatype econtext = EC_APP | EC_COMMA
fun ppExp0 s (ETUPLE [], _) = PP.string s "()"
| ppExp0 s (ETUPLE [x], c) = ppExp0 s (x, c)
| ppExp0 s (ETUPLE xl, _) = let
fun loop [] = ()
| loop [x] = ppExp0 s (x, EC_COMMA)
| loop (x :: xl) =
(ppExp0 s (x, EC_COMMA); PP.string s ","; PP.space s 1;
loop xl)
in
PP.openHVBox s (PP.Rel 1);
PP.string s "(";
loop xl;
PP.string s ")";
PP.closeBox s
end
| ppExp0 s (ERECORD [], _) = PP.string s "{}"
| ppExp0 s (ERECORD xl, _) = let
fun loop [] = ()
| loop [(n, x)] = (PP.string s (n ^ " =");
PP.space s 1;
ppExp0 s (x, EC_COMMA))
| loop ((n, x) :: xl) = (PP.string s (n ^ " =");
PP.space s 1;
ppExp0 s (x, EC_COMMA);
PP.string s ",";
PP.space s 1;
loop xl)
in
PP.openHVBox s (PP.Rel 2);
PP.string s "{ ";
loop xl;
PP.string s " }";
PP.closeBox s
end
| ppExp0 s (EVAR v, _) = PP.string s v
| ppExp0 s (EAPP (x, y), c) = let
fun loop (EAPP (x, y)) =
(loop x; ppExp0 s (y, EC_APP); PP.space s 1)
| loop x = (ppExp0 s (x, EC_APP);
PP.space s 1;
PP.openHOVBox s (PP.Rel 0))
val paren = c = EC_APP
in
PP.openHOVBox s (PP.Abs 4);
if paren then PP.string s "(" else ();
loop x;
ppExp0 s (y, EC_APP);
if paren then PP.string s ")" else ();
PP.closeBox s;
PP.closeBox s
end
| ppExp0 s (ECONSTR (x, t), c) = let
val paren = c = EC_APP
val indent = if paren then 5 else 4
val tc = if paren then C_CON else C_COMMA
in
PP.openHOVBox s (PP.Rel indent);
if paren then PP.string s "(" else ();
ppExp0 s (x, c);
PP.nbSpace s 1;
PP.string s ":";
PP.space s 1;
ppType' s (t, tc);
if paren then PP.string s ")" else ();
PP.closeBox s
end
| ppExp0 s (ESEQ (x, y), c) = let
in
PP.string s "(";
PP.openHVBox s (PP.Rel 0);
ppExp0 s (x, EC_COMMA);
PP.string s ";";
PP.space s 1;
ppExp0 s (y, EC_COMMA);
PP.string s ")";
PP.closeBox s
end
| ppExp0 s (EPRIM (p, t), c) = let
val paren = c = EC_APP
val indent = if paren then 5 else 4
val tc = if paren then C_CON else C_COMMA
in
PP.openHOVBox s (PP.Rel indent);
if paren then PP.string s "(" else ();
PP.string s p;
PP.nbSpace s 1;
PP.string s ":";
PP.space s 1;
ppType' s (t, tc);
PP.string s ";";
if paren then PP.string s ")" else ();
PP.closeBox s
end
| ppExp0 s (ELET ([], e), c) = ppExp0 s (e, c)
| ppExp0 s (ELET (bnds, e), c) = let
fun loop [] = ()
| loop ((v, e) :: bnds) = (PP.newline s;
PP.openHOVBox s (PP.Abs 4);
PP.string s "val";
PP.nbSpace s 1;
PP.string s v;
PP.nbSpace s 1;
PP.string s "=";
PP.space s 1;
ppExp0 s (e, EC_COMMA);
PP.closeBox s;
loop bnds)
in
PP.string s "let";
PP.openVBox s (PP.Abs 4);
loop bnds;
PP.closeBox s;
PP.newline s;
PP.string s "in";
PP.openVBox s (PP.Abs 4);
PP.newline s;
ppExp0 s (e, EC_COMMA);
PP.closeBox s;
PP.newline s;
PP.string s "end"
end
fun ppExp s x = ppExp0 s (x, EC_COMMA)
fun ppExp' s x = ppExp0 s (x, EC_APP)
fun ppFun s (name, args, body) =
(PP.openHOVBox s (PP.Rel 4);
PP.string s ("fun " ^ name);
PP.nbSpace s 1;
app (fn a => (ppExp' s a; PP.space s 1)) args;
PP.string s "=";
PP.nbSpace s 1;
PP.openBox s (PP.Rel 0);
ppExp s body;
PP.closeBox s;
PP.closeBox s)
end
|
