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annotate src/mono_util.sml @ 68:c1e21ab42896

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Explify cfold
author Adam Chlipala <adamc@hcoop.net>
date Thu, 26 Jun 2008 09:51:28 -0400
parents 92361a008a10
children 40d146f467c5
rev   line source
adamc@26 1 (* Copyright (c) 2008, Adam Chlipala
adamc@26 2 * All rights reserved.
adamc@26 3 *
adamc@26 4 * Redistribution and use in source and binary forms, with or without
adamc@26 5 * modification, are permitted provided that the following conditions are met:
adamc@26 6 *
adamc@26 7 * - Redistributions of source code must retain the above copyright notice,
adamc@26 8 * this list of conditions and the following disclaimer.
adamc@26 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@26 10 * this list of conditions and the following disclaimer in the documentation
adamc@26 11 * and/or other materials provided with the distribution.
adamc@26 12 * - The names of contributors may not be used to endorse or promote products
adamc@26 13 * derived from this software without specific prior written permission.
adamc@26 14 *
adamc@26 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@26 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@26 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@26 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@26 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@26 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@26 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@26 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@26 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@26 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@26 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@26 26 *)
adamc@26 27
adamc@26 28 structure MonoUtil :> MONO_UTIL = struct
adamc@26 29
adamc@26 30 open Mono
adamc@26 31
adamc@26 32 structure S = Search
adamc@26 33
adamc@26 34 structure Typ = struct
adamc@26 35
adamc@26 36 fun mapfold fc =
adamc@26 37 let
adamc@26 38 fun mft c acc =
adamc@26 39 S.bindP (mft' c acc, fc)
adamc@26 40
adamc@26 41 and mft' (cAll as (c, loc)) =
adamc@26 42 case c of
adamc@26 43 TFun (t1, t2) =>
adamc@26 44 S.bind2 (mft t1,
adamc@26 45 fn t1' =>
adamc@26 46 S.map2 (mft t2,
adamc@26 47 fn t2' =>
adamc@26 48 (TFun (t1', t2'), loc)))
adamc@26 49 | TRecord xts =>
adamc@26 50 S.map2 (ListUtil.mapfold (fn (x, t) =>
adamc@26 51 S.map2 (mft t,
adamc@26 52 fn t' =>
adamc@26 53 (x, t')))
adamc@26 54 xts,
adamc@26 55 fn xts' => (TRecord xts', loc))
adamc@26 56 | TNamed _ => S.return2 cAll
adamc@51 57 | TFfi _ => S.return2 cAll
adamc@26 58 in
adamc@26 59 mft
adamc@26 60 end
adamc@26 61
adamc@26 62 fun map typ c =
adamc@26 63 case mapfold (fn c => fn () => S.Continue (typ c, ())) c () of
adamc@26 64 S.Return () => raise Fail "Mono_util.Typ.map"
adamc@26 65 | S.Continue (c, ()) => c
adamc@26 66
adamc@26 67 fun fold typ s c =
adamc@26 68 case mapfold (fn c => fn s => S.Continue (c, typ (c, s))) c s of
adamc@26 69 S.Continue (_, s) => s
adamc@26 70 | S.Return _ => raise Fail "MonoUtil.Typ.fold: Impossible"
adamc@26 71
adamc@26 72 fun exists typ k =
adamc@26 73 case mapfold (fn c => fn () =>
adamc@26 74 if typ c then
adamc@26 75 S.Return ()
adamc@26 76 else
adamc@26 77 S.Continue (c, ())) k () of
adamc@26 78 S.Return _ => true
adamc@26 79 | S.Continue _ => false
adamc@26 80
adamc@26 81 end
adamc@26 82
adamc@26 83 structure Exp = struct
adamc@26 84
adamc@26 85 datatype binder =
adamc@26 86 NamedT of string * int * typ option
adamc@26 87 | RelE of string * typ
adamc@26 88 | NamedE of string * int * typ * exp option
adamc@26 89
adamc@26 90 fun mapfoldB {typ = fc, exp = fe, bind} =
adamc@26 91 let
adamc@26 92 val mft = Typ.mapfold fc
adamc@26 93
adamc@26 94 fun mfe ctx e acc =
adamc@26 95 S.bindP (mfe' ctx e acc, fe ctx)
adamc@26 96
adamc@26 97 and mfe' ctx (eAll as (e, loc)) =
adamc@26 98 case e of
adamc@26 99 EPrim _ => S.return2 eAll
adamc@26 100 | ERel _ => S.return2 eAll
adamc@26 101 | ENamed _ => S.return2 eAll
adamc@51 102 | EFfi _ => S.return2 eAll
adamc@51 103 | EFfiApp (m, x, es) =>
adamc@51 104 S.map2 (ListUtil.mapfold (fn e => mfe ctx e) es,
adamc@51 105 fn es' =>
adamc@51 106 (EFfiApp (m, x, es'), loc))
adamc@26 107 | EApp (e1, e2) =>
adamc@26 108 S.bind2 (mfe ctx e1,
adamc@26 109 fn e1' =>
adamc@26 110 S.map2 (mfe ctx e2,
adamc@26 111 fn e2' =>
adamc@26 112 (EApp (e1', e2'), loc)))
adamc@26 113 | EAbs (x, dom, ran, e) =>
adamc@26 114 S.bind2 (mft dom,
adamc@26 115 fn dom' =>
adamc@26 116 S.bind2 (mft ran,
adamc@26 117 fn ran' =>
adamc@26 118 S.map2 (mfe (bind (ctx, RelE (x, dom'))) e,
adamc@26 119 fn e' =>
adamc@26 120 (EAbs (x, dom', ran', e'), loc))))
adamc@26 121
adamc@26 122 | ERecord xes =>
adamc@29 123 S.map2 (ListUtil.mapfold (fn (x, e, t) =>
adamc@29 124 S.bind2 (mfe ctx e,
adamc@26 125 fn e' =>
adamc@29 126 S.map2 (mft t,
adamc@29 127 fn t' =>
adamc@29 128 (x, e', t'))))
adamc@26 129 xes,
adamc@26 130 fn xes' =>
adamc@26 131 (ERecord xes', loc))
adamc@26 132 | EField (e, x) =>
adamc@26 133 S.map2 (mfe ctx e,
adamc@26 134 fn e' =>
adamc@26 135 (EField (e', x), loc))
adamc@26 136 in
adamc@26 137 mfe
adamc@26 138 end
adamc@26 139
adamc@26 140 fun mapfold {typ = fc, exp = fe} =
adamc@26 141 mapfoldB {typ = fc,
adamc@26 142 exp = fn () => fe,
adamc@26 143 bind = fn ((), _) => ()} ()
adamc@26 144
adamc@26 145 fun mapB {typ, exp, bind} ctx e =
adamc@26 146 case mapfoldB {typ = fn c => fn () => S.Continue (typ c, ()),
adamc@26 147 exp = fn ctx => fn e => fn () => S.Continue (exp ctx e, ()),
adamc@26 148 bind = bind} ctx e () of
adamc@26 149 S.Continue (e, ()) => e
adamc@26 150 | S.Return _ => raise Fail "MonoUtil.Exp.mapB: Impossible"
adamc@26 151
adamc@26 152 fun map {typ, exp} e =
adamc@26 153 case mapfold {typ = fn c => fn () => S.Continue (typ c, ()),
adamc@26 154 exp = fn e => fn () => S.Continue (exp e, ())} e () of
adamc@26 155 S.Return () => raise Fail "Mono_util.Exp.map"
adamc@26 156 | S.Continue (e, ()) => e
adamc@26 157
adamc@26 158 fun fold {typ, exp} s e =
adamc@26 159 case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
adamc@26 160 exp = fn e => fn s => S.Continue (e, exp (e, s))} e s of
adamc@26 161 S.Continue (_, s) => s
adamc@26 162 | S.Return _ => raise Fail "MonoUtil.Exp.fold: Impossible"
adamc@26 163
adamc@26 164 fun exists {typ, exp} k =
adamc@26 165 case mapfold {typ = fn c => fn () =>
adamc@26 166 if typ c then
adamc@26 167 S.Return ()
adamc@26 168 else
adamc@26 169 S.Continue (c, ()),
adamc@26 170 exp = fn e => fn () =>
adamc@26 171 if exp e then
adamc@26 172 S.Return ()
adamc@26 173 else
adamc@26 174 S.Continue (e, ())} k () of
adamc@26 175 S.Return _ => true
adamc@26 176 | S.Continue _ => false
adamc@26 177
adamc@26 178 end
adamc@26 179
adamc@26 180 structure Decl = struct
adamc@26 181
adamc@26 182 datatype binder = datatype Exp.binder
adamc@26 183
adamc@26 184 fun mapfoldB {typ = fc, exp = fe, decl = fd, bind} =
adamc@26 185 let
adamc@26 186 val mft = Typ.mapfold fc
adamc@26 187
adamc@26 188 val mfe = Exp.mapfoldB {typ = fc, exp = fe, bind = bind}
adamc@26 189
adamc@26 190 fun mfd ctx d acc =
adamc@26 191 S.bindP (mfd' ctx d acc, fd ctx)
adamc@26 192
adamc@26 193 and mfd' ctx (dAll as (d, loc)) =
adamc@26 194 case d of
adamc@26 195 DVal (x, n, t, e) =>
adamc@26 196 S.bind2 (mft t,
adamc@26 197 fn t' =>
adamc@26 198 S.map2 (mfe ctx e,
adamc@26 199 fn e' =>
adamc@26 200 (DVal (x, n, t', e'), loc)))
adamc@26 201 in
adamc@26 202 mfd
adamc@26 203 end
adamc@26 204
adamc@26 205 fun mapfold {typ = fc, exp = fe, decl = fd} =
adamc@26 206 mapfoldB {typ = fc,
adamc@26 207 exp = fn () => fe,
adamc@26 208 decl = fn () => fd,
adamc@26 209 bind = fn ((), _) => ()} ()
adamc@26 210
adamc@26 211 fun fold {typ, exp, decl} s d =
adamc@26 212 case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
adamc@26 213 exp = fn e => fn s => S.Continue (e, exp (e, s)),
adamc@26 214 decl = fn d => fn s => S.Continue (d, decl (d, s))} d s of
adamc@26 215 S.Continue (_, s) => s
adamc@26 216 | S.Return _ => raise Fail "MonoUtil.Decl.fold: Impossible"
adamc@26 217
adamc@26 218 end
adamc@26 219
adamc@26 220 structure File = struct
adamc@26 221
adamc@26 222 datatype binder = datatype Exp.binder
adamc@26 223
adamc@26 224 fun mapfoldB (all as {bind, ...}) =
adamc@26 225 let
adamc@26 226 val mfd = Decl.mapfoldB all
adamc@26 227
adamc@26 228 fun mff ctx ds =
adamc@26 229 case ds of
adamc@26 230 nil => S.return2 nil
adamc@26 231 | d :: ds' =>
adamc@26 232 S.bind2 (mfd ctx d,
adamc@26 233 fn d' =>
adamc@26 234 let
adamc@26 235 val b =
adamc@26 236 case #1 d' of
adamc@26 237 DVal (x, n, t, e) => NamedE (x, n, t, SOME e)
adamc@26 238 val ctx' = bind (ctx, b)
adamc@26 239 in
adamc@26 240 S.map2 (mff ctx' ds',
adamc@26 241 fn ds' =>
adamc@26 242 d' :: ds')
adamc@26 243 end)
adamc@26 244 in
adamc@26 245 mff
adamc@26 246 end
adamc@26 247
adamc@26 248 fun mapfold {typ = fc, exp = fe, decl = fd} =
adamc@26 249 mapfoldB {typ = fc,
adamc@26 250 exp = fn () => fe,
adamc@26 251 decl = fn () => fd,
adamc@26 252 bind = fn ((), _) => ()} ()
adamc@26 253
adamc@26 254 fun mapB {typ, exp, decl, bind} ctx ds =
adamc@26 255 case mapfoldB {typ = fn c => fn () => S.Continue (typ c, ()),
adamc@26 256 exp = fn ctx => fn e => fn () => S.Continue (exp ctx e, ()),
adamc@26 257 decl = fn ctx => fn d => fn () => S.Continue (decl ctx d, ()),
adamc@26 258 bind = bind} ctx ds () of
adamc@26 259 S.Continue (ds, ()) => ds
adamc@26 260 | S.Return _ => raise Fail "MonoUtil.File.mapB: Impossible"
adamc@26 261
adamc@26 262 fun fold {typ, exp, decl} s d =
adamc@26 263 case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
adamc@26 264 exp = fn e => fn s => S.Continue (e, exp (e, s)),
adamc@26 265 decl = fn d => fn s => S.Continue (d, decl (d, s))} d s of
adamc@26 266 S.Continue (_, s) => s
adamc@26 267 | S.Return _ => raise Fail "MonoUtil.File.fold: Impossible"
adamc@26 268
adamc@26 269 end
adamc@26 270
adamc@26 271 end