annotate src/search.sml @ 984:815afd323d86

Whitelisting tags that may be self-closed
author Adam Chlipala <adamc@hcoop.net>
date Sat, 26 Sep 2009 12:45:19 -0400
parents e97c6d335869
children
rev   line source
adamc@2 1 (* Copyright (c) 2008, Adam Chlipala
adamc@2 2 * All rights reserved.
adamc@2 3 *
adamc@2 4 * Redistribution and use in source and binary forms, with or without
adamc@2 5 * modification, are permitted provided that the following conditions are met:
adamc@2 6 *
adamc@2 7 * - Redistributions of source code must retain the above copyright notice,
adamc@2 8 * this list of conditions and the following disclaimer.
adamc@2 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@2 10 * this list of conditions and the following disclaimer in the documentation
adamc@2 11 * and/or other materials provided with the distribution.
adamc@2 12 * - The names of contributors may not be used to endorse or promote products
adamc@2 13 * derived from this software without specific prior written permission.
adamc@2 14 *
adamc@2 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@2 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@2 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@2 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@2 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@2 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@2 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@2 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@2 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@2 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@2 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@2 26 *)
adamc@2 27
adamc@2 28 structure Search :> SEARCH = struct
adamc@2 29
adamc@2 30 datatype ('state, 'abort) result =
adamc@2 31 Return of 'abort
adamc@2 32 | Continue of 'state
adamc@2 33
adamc@2 34 type ('data, 'state, 'abort) mapfold_arg =
adamc@2 35 'data * 'state -> ('data * 'state, 'abort) result
adamc@2 36
adamc@2 37 type ('data, 'state, 'abort) mapfolder =
adamc@2 38 'data -> 'state -> ('data * 'state, 'abort) result
adamc@2 39
adamc@11 40 type ('context, 'data, 'state, 'abort) mapfolderB =
adamc@11 41 'context -> 'data -> 'state -> ('data * 'state, 'abort) result
adamc@11 42
adamc@2 43 fun return2 v acc = Continue (v, acc)
adamc@2 44
adamc@2 45 fun map (r, f) =
adamc@2 46 case r of
adamc@2 47 Continue acc => Continue (f acc)
adamc@2 48 | Return x => Return x
adamc@2 49
adamc@2 50 fun map2 (r, f) acc =
adamc@2 51 case r acc of
adamc@2 52 Continue (x, acc) => Continue (f x, acc)
adamc@2 53 | Return x => Return x
adamc@2 54
adamc@2 55 fun bind (r, f) =
adamc@2 56 case r of
adamc@2 57 Continue acc => f acc
adamc@2 58 | Return x => Return x
adamc@2 59
adamc@2 60 fun bind2 (r, f) acc =
adamc@2 61 case r acc of
adamc@2 62 Continue (x, acc) => f x acc
adamc@2 63 | Return x => Return x
adamc@2 64
adamc@2 65 fun bindP (r, f) =
adamc@2 66 case r of
adamc@2 67 Continue ((x, pos), acc) =>
adamc@6 68 map (f x acc,
adamc@2 69 fn (x', acc') =>
adamc@2 70 ((x', pos), acc'))
adamc@2 71 | Return x => Return x
adamc@2 72
adamc@2 73 end