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(*
Copyright (c) 2001, 2015
David C.J. Matthews
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License version 2.1 as published by the Free Software Foundation.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*)
functor FlagPrint(structure BITS: BIT_FLAGS) =
struct
(* Auxiliary function to create a function to print out bit flags.
The function must actually be installed by the caller because
it has to be called with the type itself. *)
fun createFlagPrinter (flagTable: (BITS.flags * string) list) =
let
fun accumulateFlags _ [] = []
| accumulateFlags f ((w, s)::t) =
if BITS.allSet(w, f) then s :: accumulateFlags(BITS.clear(w, f)) t
else accumulateFlags f t
fun printFlags depth _ x =
(* This is just the code to print a list. *)
let
open PolyML
val stringFlags = accumulateFlags x flagTable
fun plist [] _ = []
| plist _ 0 = [PrettyString "..."]
| plist [h] _ = [PrettyString h]
| plist (h::t) depth =
PrettyString(h ^ ",") ::
PrettyBreak (1, 0) ::
plist t (depth - 1)
in
PrettyBlock (3, false, [],
PrettyString "[" ::
((if depth <= 0 then [PrettyString "..."]
else plist stringFlags depth) @
[PrettyString "]"]
)
)
end
in
printFlags
end;
end;
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