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(* Copyright (c) 2008, Adam Chlipala
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - The names of contributors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*)
structure ListUtil :> LIST_UTIL = struct
structure S = Search
fun mapConcat f =
let
fun mc acc ls =
case ls of
[] => rev acc
| h :: t => mc (List.revAppend (f h, acc)) t
in
mc []
end
fun mapfold f =
let
fun mf ls s =
case ls of
nil => S.Continue (nil, s)
| h :: t =>
case f h s of
S.Return x => S.Return x
| S.Continue (h', s) =>
case mf t s of
S.Return x => S.Return x
| S.Continue (t', s) => S.Continue (h' :: t', s)
in
mf
end
fun mapfoldB f =
let
fun mf ctx ls s =
case ls of
nil => S.Continue (nil, s)
| h :: t =>
let
val (ctx, r) = f (ctx, h)
in
case r s of
S.Return x => S.Return x
| S.Continue (h', s) =>
case mf ctx t s of
S.Return x => S.Return x
| S.Continue (t', s) => S.Continue (h' :: t', s)
end
in
mf
end
fun foldlMap f s =
let
fun fm (ls', s) ls =
case ls of
nil => (rev ls', s)
| h :: t =>
let
val (h', s') = f (h, s)
in
fm (h' :: ls', s') t
end
in
fm ([], s)
end
fun foldlMapConcat f s =
let
fun fm (ls', s) ls =
case ls of
nil => (rev ls', s)
| h :: t =>
let
val (h', s') = f (h, s)
in
fm (List.revAppend (h', ls'), s') t
end
in
fm ([], s)
end
fun foldlMapPartial f s =
let
fun fm (ls', s) ls =
case ls of
nil => (rev ls', s)
| h :: t =>
let
val (h', s') = f (h, s)
val ls' = case h' of
NONE => ls'
| SOME h' => h' :: ls'
in
fm (ls', s') t
end
in
fm ([], s)
end
fun search f =
let
fun s ls =
case ls of
[] => NONE
| h :: t =>
case f h of
NONE => s t
| v => v
in
s
end
fun mapi f =
let
fun m i acc ls =
case ls of
[] => rev acc
| h :: t => m (i + 1) (f (i, h) :: acc) t
in
m 0 []
end
fun foldli f =
let
fun m i acc ls =
case ls of
[] => acc
| h :: t => m (i + 1) (f (i, h, acc)) t
in
m 0
end
fun foldri f i ls =
let
val len = length ls
in
foldli (fn (n, x, s) => f (len - n - 1, x, s)) i (rev ls)
end
fun foldliMap f s =
let
fun fm (n, ls', s) ls =
case ls of
nil => (rev ls', s)
| h :: t =>
let
val (h', s') = f (n, h, s)
in
fm (n + 1, h' :: ls', s') t
end
in
fm (0, [], s)
end
end
|
