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annotate src/expl_util.sml @ 684:f0224c7f12bb

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Expunging nullable fields
author Adam Chlipala <adamc@hcoop.net>
date Sun, 29 Mar 2009 14:13:50 -0400
parents 354800878b4d
children 0e554bfd6d6a
rev   line source
adamc@38 1 (* Copyright (c) 2008, Adam Chlipala
adamc@38 2 * All rights reserved.
adamc@38 3 *
adamc@38 4 * Redistribution and use in source and binary forms, with or without
adamc@38 5 * modification, are permitted provided that the following conditions are met:
adamc@38 6 *
adamc@38 7 * - Redistributions of source code must retain the above copyright notice,
adamc@38 8 * this list of conditions and the following disclaimer.
adamc@38 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@38 10 * this list of conditions and the following disclaimer in the documentation
adamc@38 11 * and/or other materials provided with the distribution.
adamc@38 12 * - The names of contributors may not be used to endorse or promote products
adamc@38 13 * derived from this software without specific prior written permission.
adamc@38 14 *
adamc@38 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@38 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@38 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@38 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@38 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@38 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@38 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@38 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@38 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@38 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@38 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@38 26 *)
adamc@38 27
adamc@38 28 structure ExplUtil :> EXPL_UTIL = struct
adamc@38 29
adamc@38 30 open Expl
adamc@38 31
adamc@38 32 structure S = Search
adamc@38 33
adamc@38 34 structure Kind = struct
adamc@38 35
adamc@624 36 fun mapfoldB {kind, bind} =
adamc@38 37 let
adamc@624 38 fun mfk ctx k acc =
adamc@624 39 S.bindP (mfk' ctx k acc, kind ctx)
adamc@38 40
adamc@624 41 and mfk' ctx (kAll as (k, loc)) =
adamc@38 42 case k of
adamc@38 43 KType => S.return2 kAll
adamc@38 44
adamc@38 45 | KArrow (k1, k2) =>
adamc@624 46 S.bind2 (mfk ctx k1,
adamc@38 47 fn k1' =>
adamc@624 48 S.map2 (mfk ctx k2,
adamc@38 49 fn k2' =>
adamc@38 50 (KArrow (k1', k2'), loc)))
adamc@38 51
adamc@38 52 | KName => S.return2 kAll
adamc@38 53
adamc@38 54 | KRecord k =>
adamc@624 55 S.map2 (mfk ctx k,
adamc@38 56 fn k' =>
adamc@38 57 (KRecord k', loc))
adamc@87 58
adamc@87 59 | KUnit => S.return2 kAll
adamc@213 60
adamc@213 61 | KTuple ks =>
adamc@624 62 S.map2 (ListUtil.mapfold (mfk ctx) ks,
adamc@213 63 fn ks' =>
adamc@213 64 (KTuple ks', loc))
adamc@624 65
adamc@624 66 | KRel _ => S.return2 kAll
adamc@624 67 | KFun (x, k) =>
adamc@624 68 S.map2 (mfk (bind (ctx, x)) k,
adamc@624 69 fn k' =>
adamc@624 70 (KFun (x, k'), loc))
adamc@38 71 in
adamc@38 72 mfk
adamc@38 73 end
adamc@38 74
adamc@624 75 fun mapfold fk =
adamc@624 76 mapfoldB {kind = fn () => fk,
adamc@624 77 bind = fn ((), _) => ()} ()
adamc@624 78
adamc@624 79 fun mapB {kind, bind} ctx k =
adamc@624 80 case mapfoldB {kind = fn ctx => fn k => fn () => S.Continue (kind ctx k, ()),
adamc@624 81 bind = bind} ctx k () of
adamc@624 82 S.Continue (k, ()) => k
adamc@624 83 | S.Return _ => raise Fail "ExplUtil.Kind.mapB: Impossible"
adamc@624 84
adamc@38 85 fun exists f k =
adamc@38 86 case mapfold (fn k => fn () =>
adamc@38 87 if f k then
adamc@38 88 S.Return ()
adamc@38 89 else
adamc@38 90 S.Continue (k, ())) k () of
adamc@38 91 S.Return _ => true
adamc@38 92 | S.Continue _ => false
adamc@38 93
adamc@38 94 end
adamc@38 95
adamc@38 96 structure Con = struct
adamc@38 97
adamc@38 98 datatype binder =
adamc@624 99 RelK of string
adamc@624 100 | RelC of string * Expl.kind
adamc@624 101 | NamedC of string * Expl.kind
adamc@38 102
adamc@38 103 fun mapfoldB {kind = fk, con = fc, bind} =
adamc@38 104 let
adamc@624 105 val mfk = Kind.mapfoldB {kind = fk, bind = fn (ctx, x) => bind (ctx, RelK x)}
adamc@38 106
adamc@38 107 fun mfc ctx c acc =
adamc@38 108 S.bindP (mfc' ctx c acc, fc ctx)
adamc@38 109
adamc@38 110 and mfc' ctx (cAll as (c, loc)) =
adamc@38 111 case c of
adamc@38 112 TFun (c1, c2) =>
adamc@38 113 S.bind2 (mfc ctx c1,
adamc@38 114 fn c1' =>
adamc@38 115 S.map2 (mfc ctx c2,
adamc@38 116 fn c2' =>
adamc@38 117 (TFun (c1', c2'), loc)))
adamc@38 118 | TCFun (x, k, c) =>
adamc@624 119 S.bind2 (mfk ctx k,
adamc@38 120 fn k' =>
adamc@624 121 S.map2 (mfc (bind (ctx, RelC (x, k))) c,
adamc@38 122 fn c' =>
adamc@38 123 (TCFun (x, k', c'), loc)))
adamc@38 124 | TRecord c =>
adamc@38 125 S.map2 (mfc ctx c,
adamc@38 126 fn c' =>
adamc@38 127 (TRecord c', loc))
adamc@38 128
adamc@38 129 | CRel _ => S.return2 cAll
adamc@38 130 | CNamed _ => S.return2 cAll
adamc@38 131 | CModProj _ => S.return2 cAll
adamc@38 132 | CApp (c1, c2) =>
adamc@38 133 S.bind2 (mfc ctx c1,
adamc@38 134 fn c1' =>
adamc@38 135 S.map2 (mfc ctx c2,
adamc@38 136 fn c2' =>
adamc@38 137 (CApp (c1', c2'), loc)))
adamc@38 138 | CAbs (x, k, c) =>
adamc@624 139 S.bind2 (mfk ctx k,
adamc@38 140 fn k' =>
adamc@624 141 S.map2 (mfc (bind (ctx, RelC (x, k))) c,
adamc@38 142 fn c' =>
adamc@38 143 (CAbs (x, k', c'), loc)))
adamc@38 144
adamc@38 145 | CName _ => S.return2 cAll
adamc@38 146
adamc@38 147 | CRecord (k, xcs) =>
adamc@624 148 S.bind2 (mfk ctx k,
adamc@38 149 fn k' =>
adamc@38 150 S.map2 (ListUtil.mapfold (fn (x, c) =>
adamc@38 151 S.bind2 (mfc ctx x,
adamc@38 152 fn x' =>
adamc@38 153 S.map2 (mfc ctx c,
adamc@38 154 fn c' =>
adamc@38 155 (x', c'))))
adamc@38 156 xcs,
adamc@38 157 fn xcs' =>
adamc@38 158 (CRecord (k', xcs'), loc)))
adamc@38 159 | CConcat (c1, c2) =>
adamc@38 160 S.bind2 (mfc ctx c1,
adamc@38 161 fn c1' =>
adamc@38 162 S.map2 (mfc ctx c2,
adamc@38 163 fn c2' =>
adamc@38 164 (CConcat (c1', c2'), loc)))
adamc@621 165 | CMap (k1, k2) =>
adamc@624 166 S.bind2 (mfk ctx k1,
adamc@68 167 fn k1' =>
adamc@624 168 S.map2 (mfk ctx k2,
adamc@68 169 fn k2' =>
adamc@621 170 (CMap (k1', k2'), loc)))
adamc@87 171
adamc@87 172 | CUnit => S.return2 cAll
adamc@213 173
adamc@213 174 | CTuple cs =>
adamc@213 175 S.map2 (ListUtil.mapfold (mfc ctx) cs,
adamc@213 176 fn cs' =>
adamc@213 177 (CTuple cs', loc))
adamc@213 178
adamc@213 179 | CProj (c, n) =>
adamc@213 180 S.map2 (mfc ctx c,
adamc@213 181 fn c' =>
adamc@213 182 (CProj (c', n), loc))
adamc@624 183
adamc@624 184 | CKAbs (x, c) =>
adamc@624 185 S.map2 (mfc (bind (ctx, RelK x)) c,
adamc@624 186 fn c' =>
adamc@624 187 (CKAbs (x, c'), loc))
adamc@624 188 | CKApp (c, k) =>
adamc@624 189 S.bind2 (mfc ctx c,
adamc@624 190 fn c' =>
adamc@624 191 S.map2 (mfk ctx k,
adamc@624 192 fn k' =>
adamc@624 193 (CKApp (c', k'), loc)))
adamc@624 194 | TKFun (x, c) =>
adamc@624 195 S.map2 (mfc (bind (ctx, RelK x)) c,
adamc@624 196 fn c' =>
adamc@624 197 (TKFun (x, c'), loc))
adamc@38 198 in
adamc@38 199 mfc
adamc@38 200 end
adamc@38 201
adamc@38 202 fun mapfold {kind = fk, con = fc} =
adamc@624 203 mapfoldB {kind = fn () => fk,
adamc@38 204 con = fn () => fc,
adamc@38 205 bind = fn ((), _) => ()} ()
adamc@38 206
adamc@38 207 fun mapB {kind, con, bind} ctx c =
adamc@624 208 case mapfoldB {kind = fn ctx => fn k => fn () => S.Continue (kind ctx k, ()),
adamc@38 209 con = fn ctx => fn c => fn () => S.Continue (con ctx c, ()),
adamc@38 210 bind = bind} ctx c () of
adamc@38 211 S.Continue (c, ()) => c
adamc@38 212 | S.Return _ => raise Fail "ExplUtil.Con.mapB: Impossible"
adamc@38 213
adamc@38 214 fun map {kind, con} s =
adamc@38 215 case mapfold {kind = fn k => fn () => S.Continue (kind k, ()),
adamc@38 216 con = fn c => fn () => S.Continue (con c, ())} s () of
adamc@38 217 S.Return () => raise Fail "ExplUtil.Con.map: Impossible"
adamc@38 218 | S.Continue (s, ()) => s
adamc@38 219
adamc@38 220 fun exists {kind, con} k =
adamc@38 221 case mapfold {kind = fn k => fn () =>
adamc@38 222 if kind k then
adamc@38 223 S.Return ()
adamc@38 224 else
adamc@38 225 S.Continue (k, ()),
adamc@38 226 con = fn c => fn () =>
adamc@38 227 if con c then
adamc@38 228 S.Return ()
adamc@38 229 else
adamc@38 230 S.Continue (c, ())} k () of
adamc@38 231 S.Return _ => true
adamc@38 232 | S.Continue _ => false
adamc@38 233
adamc@38 234 end
adamc@38 235
adamc@38 236 structure Exp = struct
adamc@38 237
adamc@38 238 datatype binder =
adamc@624 239 RelK of string
adamc@624 240 | RelC of string * Expl.kind
adamc@38 241 | NamedC of string * Expl.kind
adamc@38 242 | RelE of string * Expl.con
adamc@38 243 | NamedE of string * Expl.con
adamc@38 244
adamc@38 245 fun mapfoldB {kind = fk, con = fc, exp = fe, bind} =
adamc@38 246 let
adamc@624 247 val mfk = Kind.mapfoldB {kind = fk, bind = fn (ctx, x) => bind (ctx, RelK x)}
adamc@38 248
adamc@38 249 fun bind' (ctx, b) =
adamc@38 250 let
adamc@38 251 val b' = case b of
adamc@624 252 Con.RelK x => RelK x
adamc@624 253 | Con.RelC x => RelC x
adamc@624 254 | Con.NamedC x => NamedC x
adamc@38 255 in
adamc@38 256 bind (ctx, b')
adamc@38 257 end
adamc@38 258 val mfc = Con.mapfoldB {kind = fk, con = fc, bind = bind'}
adamc@38 259
adamc@38 260 fun mfe ctx e acc =
adamc@38 261 S.bindP (mfe' ctx e acc, fe ctx)
adamc@38 262
adamc@38 263 and mfe' ctx (eAll as (e, loc)) =
adamc@38 264 case e of
adamc@38 265 EPrim _ => S.return2 eAll
adamc@38 266 | ERel _ => S.return2 eAll
adamc@38 267 | ENamed _ => S.return2 eAll
adamc@38 268 | EModProj _ => S.return2 eAll
adamc@38 269 | EApp (e1, e2) =>
adamc@38 270 S.bind2 (mfe ctx e1,
adamc@38 271 fn e1' =>
adamc@38 272 S.map2 (mfe ctx e2,
adamc@38 273 fn e2' =>
adamc@38 274 (EApp (e1', e2'), loc)))
adamc@38 275 | EAbs (x, dom, ran, e) =>
adamc@38 276 S.bind2 (mfc ctx dom,
adamc@38 277 fn dom' =>
adamc@38 278 S.bind2 (mfc ctx ran,
adamc@38 279 fn ran' =>
adamc@38 280 S.map2 (mfe (bind (ctx, RelE (x, dom'))) e,
adamc@38 281 fn e' =>
adamc@38 282 (EAbs (x, dom', ran', e'), loc))))
adamc@38 283
adamc@38 284 | ECApp (e, c) =>
adamc@38 285 S.bind2 (mfe ctx e,
adamc@38 286 fn e' =>
adamc@38 287 S.map2 (mfc ctx c,
adamc@38 288 fn c' =>
adamc@38 289 (ECApp (e', c'), loc)))
adamc@38 290 | ECAbs (x, k, e) =>
adamc@624 291 S.bind2 (mfk ctx k,
adamc@38 292 fn k' =>
adamc@38 293 S.map2 (mfe (bind (ctx, RelC (x, k))) e,
adamc@38 294 fn e' =>
adamc@38 295 (ECAbs (x, k', e'), loc)))
adamc@38 296
adamc@38 297 | ERecord xes =>
adamc@38 298 S.map2 (ListUtil.mapfold (fn (x, e, t) =>
adamc@38 299 S.bind2 (mfc ctx x,
adamc@38 300 fn x' =>
adamc@38 301 S.bind2 (mfe ctx e,
adamc@38 302 fn e' =>
adamc@38 303 S.map2 (mfc ctx t,
adamc@38 304 fn t' =>
adamc@38 305 (x', e', t')))))
adamc@38 306 xes,
adamc@38 307 fn xes' =>
adamc@38 308 (ERecord xes', loc))
adamc@38 309 | EField (e, c, {field, rest}) =>
adamc@38 310 S.bind2 (mfe ctx e,
adamc@38 311 fn e' =>
adamc@38 312 S.bind2 (mfc ctx c,
adamc@38 313 fn c' =>
adamc@38 314 S.bind2 (mfc ctx field,
adamc@38 315 fn field' =>
adamc@38 316 S.map2 (mfc ctx rest,
adamc@38 317 fn rest' =>
adamc@38 318 (EField (e', c', {field = field', rest = rest'}), loc)))))
adamc@445 319 | EConcat (e1, c1, e2, c2) =>
adamc@339 320 S.bind2 (mfe ctx e1,
adamc@339 321 fn e1' =>
adamc@445 322 S.bind2 (mfc ctx c1,
adamc@445 323 fn c1' =>
adamc@339 324 S.bind2 (mfe ctx e2,
adamc@339 325 fn e2' =>
adamc@445 326 S.map2 (mfc ctx c2,
adamc@445 327 fn c2' =>
adamc@445 328 (EConcat (e1', c1', e2', c2'),
adamc@445 329 loc)))))
adamc@149 330 | ECut (e, c, {field, rest}) =>
adamc@149 331 S.bind2 (mfe ctx e,
adamc@149 332 fn e' =>
adamc@149 333 S.bind2 (mfc ctx c,
adamc@149 334 fn c' =>
adamc@149 335 S.bind2 (mfc ctx field,
adamc@149 336 fn field' =>
adamc@149 337 S.map2 (mfc ctx rest,
adamc@149 338 fn rest' =>
adamc@149 339 (ECut (e', c', {field = field', rest = rest'}), loc)))))
adamc@493 340 | ECutMulti (e, c, {rest}) =>
adamc@493 341 S.bind2 (mfe ctx e,
adamc@493 342 fn e' =>
adamc@493 343 S.bind2 (mfc ctx c,
adamc@493 344 fn c' =>
adamc@493 345 S.map2 (mfc ctx rest,
adamc@493 346 fn rest' =>
adamc@493 347 (ECutMulti (e', c', {rest = rest'}), loc))))
adamc@109 348
adamc@109 349 | EWrite e =>
adamc@109 350 S.map2 (mfe ctx e,
adamc@109 351 fn e' =>
adamc@109 352 (EWrite e', loc))
adamc@176 353
adamc@182 354 | ECase (e, pes, {disc, result}) =>
adamc@176 355 S.bind2 (mfe ctx e,
adamc@176 356 fn e' =>
adamc@176 357 S.bind2 (ListUtil.mapfold (fn (p, e) =>
adamc@176 358 S.map2 (mfe ctx e,
adamc@176 359 fn e' => (p, e'))) pes,
adamc@176 360 fn pes' =>
adamc@182 361 S.bind2 (mfc ctx disc,
adamc@182 362 fn disc' =>
adamc@182 363 S.map2 (mfc ctx result,
adamc@182 364 fn result' =>
adamc@182 365 (ECase (e', pes', {disc = disc', result = result'}), loc)))))
adamc@449 366
adamc@449 367 | ELet (x, t, e1, e2) =>
adamc@449 368 S.bind2 (mfc ctx t,
adamc@449 369 fn t' =>
adamc@449 370 S.bind2 (mfe ctx e1,
adamc@449 371 fn e1' =>
adamc@453 372 S.map2 (mfe (bind (ctx, RelE (x, t))) e2,
adamc@449 373 fn e2' =>
adamc@449 374 (ELet (x, t', e1', e2'), loc))))
adamc@624 375
adamc@624 376 | EKAbs (x, e) =>
adamc@624 377 S.map2 (mfe (bind (ctx, RelK x)) e,
adamc@624 378 fn e' =>
adamc@624 379 (EKAbs (x, e'), loc))
adamc@624 380 | EKApp (e, k) =>
adamc@624 381 S.bind2 (mfe ctx e,
adamc@624 382 fn e' =>
adamc@624 383 S.map2 (mfk ctx k,
adamc@624 384 fn k' =>
adamc@624 385 (EKApp (e', k'), loc)))
adamc@38 386 in
adamc@38 387 mfe
adamc@38 388 end
adamc@38 389
adamc@38 390 fun mapfold {kind = fk, con = fc, exp = fe} =
adamc@624 391 mapfoldB {kind = fn () => fk,
adamc@38 392 con = fn () => fc,
adamc@38 393 exp = fn () => fe,
adamc@38 394 bind = fn ((), _) => ()} ()
adamc@38 395
adamc@38 396 fun exists {kind, con, exp} k =
adamc@38 397 case mapfold {kind = fn k => fn () =>
adamc@38 398 if kind k then
adamc@38 399 S.Return ()
adamc@38 400 else
adamc@38 401 S.Continue (k, ()),
adamc@38 402 con = fn c => fn () =>
adamc@38 403 if con c then
adamc@38 404 S.Return ()
adamc@38 405 else
adamc@38 406 S.Continue (c, ()),
adamc@38 407 exp = fn e => fn () =>
adamc@38 408 if exp e then
adamc@38 409 S.Return ()
adamc@38 410 else
adamc@38 411 S.Continue (e, ())} k () of
adamc@38 412 S.Return _ => true
adamc@38 413 | S.Continue _ => false
adamc@38 414
adamc@38 415 end
adamc@38 416
adamc@38 417 structure Sgn = struct
adamc@38 418
adamc@38 419 datatype binder =
adamc@624 420 RelK of string
adamc@624 421 | RelC of string * Expl.kind
adamc@38 422 | NamedC of string * Expl.kind
adamc@38 423 | Str of string * Expl.sgn
adamc@64 424 | Sgn of string * Expl.sgn
adamc@38 425
adamc@38 426 fun mapfoldB {kind, con, sgn_item, sgn, bind} =
adamc@38 427 let
adamc@38 428 fun bind' (ctx, b) =
adamc@38 429 let
adamc@38 430 val b' = case b of
adamc@624 431 Con.RelK x => RelK x
adamc@624 432 | Con.RelC x => RelC x
adamc@624 433 | Con.NamedC x => NamedC x
adamc@38 434 in
adamc@38 435 bind (ctx, b')
adamc@38 436 end
adamc@38 437 val con = Con.mapfoldB {kind = kind, con = con, bind = bind'}
adamc@38 438
adamc@624 439 val kind = Kind.mapfoldB {kind = kind, bind = fn (ctx, x) => bind (ctx, RelK x)}
adamc@38 440
adamc@38 441 fun sgi ctx si acc =
adamc@38 442 S.bindP (sgi' ctx si acc, sgn_item ctx)
adamc@38 443
adamc@162 444 and sgi' ctx (siAll as (si, loc)) =
adamc@38 445 case si of
adamc@38 446 SgiConAbs (x, n, k) =>
adamc@624 447 S.map2 (kind ctx k,
adamc@38 448 fn k' =>
adamc@38 449 (SgiConAbs (x, n, k'), loc))
adamc@38 450 | SgiCon (x, n, k, c) =>
adamc@624 451 S.bind2 (kind ctx k,
adamc@38 452 fn k' =>
adamc@38 453 S.map2 (con ctx c,
adamc@38 454 fn c' =>
adamc@38 455 (SgiCon (x, n, k', c'), loc)))
adamc@191 456 | SgiDatatype (x, n, xs, xncs) =>
adamc@162 457 S.map2 (ListUtil.mapfold (fn (x, n, c) =>
adamc@162 458 case c of
adamc@162 459 NONE => S.return2 (x, n, c)
adamc@162 460 | SOME c =>
adamc@162 461 S.map2 (con ctx c,
adamc@162 462 fn c' => (x, n, SOME c'))) xncs,
adamc@162 463 fn xncs' =>
adamc@191 464 (SgiDatatype (x, n, xs, xncs'), loc))
adamc@191 465 | SgiDatatypeImp (x, n, m1, ms, s, xs, xncs) =>
adamc@162 466 S.map2 (ListUtil.mapfold (fn (x, n, c) =>
adamc@162 467 case c of
adamc@162 468 NONE => S.return2 (x, n, c)
adamc@162 469 | SOME c =>
adamc@162 470 S.map2 (con ctx c,
adamc@162 471 fn c' => (x, n, SOME c'))) xncs,
adamc@162 472 fn xncs' =>
adamc@191 473 (SgiDatatypeImp (x, n, m1, ms, s, xs, xncs'), loc))
adamc@38 474 | SgiVal (x, n, c) =>
adamc@38 475 S.map2 (con ctx c,
adamc@38 476 fn c' =>
adamc@38 477 (SgiVal (x, n, c'), loc))
adamc@38 478 | SgiStr (x, n, s) =>
adamc@38 479 S.map2 (sg ctx s,
adamc@38 480 fn s' =>
adamc@38 481 (SgiStr (x, n, s'), loc))
adamc@64 482 | SgiSgn (x, n, s) =>
adamc@64 483 S.map2 (sg ctx s,
adamc@64 484 fn s' =>
adamc@64 485 (SgiSgn (x, n, s'), loc))
adamc@38 486
adamc@38 487 and sg ctx s acc =
adamc@38 488 S.bindP (sg' ctx s acc, sgn ctx)
adamc@38 489
adamc@38 490 and sg' ctx (sAll as (s, loc)) =
adamc@38 491 case s of
adamc@38 492 SgnConst sgis =>
adamc@38 493 S.map2 (ListUtil.mapfoldB (fn (ctx, si) =>
adamc@38 494 (case #1 si of
adamc@38 495 SgiConAbs (x, _, k) =>
adamc@38 496 bind (ctx, NamedC (x, k))
adamc@38 497 | SgiCon (x, _, k, _) =>
adamc@38 498 bind (ctx, NamedC (x, k))
adamc@191 499 | SgiDatatype (x, n, _, xncs) =>
adamc@162 500 bind (ctx, NamedC (x, (KType, loc)))
adamc@191 501 | SgiDatatypeImp (x, _, _, _, _, _, _) =>
adamc@162 502 bind (ctx, NamedC (x, (KType, loc)))
adamc@38 503 | SgiVal _ => ctx
adamc@38 504 | SgiStr (x, _, sgn) =>
adamc@64 505 bind (ctx, Str (x, sgn))
adamc@64 506 | SgiSgn (x, _, sgn) =>
adamc@460 507 bind (ctx, Sgn (x, sgn)),
adamc@38 508 sgi ctx si)) ctx sgis,
adamc@38 509 fn sgis' =>
adamc@38 510 (SgnConst sgis', loc))
adamc@38 511
adamc@38 512 | SgnVar _ => S.return2 sAll
adamc@45 513
adamc@45 514 | SgnFun (m, n, s1, s2) =>
adamc@45 515 S.bind2 (sg ctx s1,
adamc@45 516 fn s1' =>
adamc@45 517 S.map2 (sg (bind (ctx, Str (m, s1'))) s2,
adamc@45 518 fn s2' =>
adamc@45 519 (SgnFun (m, n, s1', s2'), loc)))
adamc@45 520 | SgnWhere (sgn, x, c) =>
adamc@45 521 S.bind2 (sg ctx sgn,
adamc@45 522 fn sgn' =>
adamc@45 523 S.map2 (con ctx c,
adamc@45 524 fn c' =>
adamc@45 525 (SgnWhere (sgn', x, c'), loc)))
adamc@64 526 | SgnProj _ => S.return2 sAll
adamc@38 527 in
adamc@38 528 sg
adamc@38 529 end
adamc@38 530
adamc@38 531 fun mapfold {kind, con, sgn_item, sgn} =
adamc@624 532 mapfoldB {kind = fn () => kind,
adamc@38 533 con = fn () => con,
adamc@38 534 sgn_item = fn () => sgn_item,
adamc@38 535 sgn = fn () => sgn,
adamc@38 536 bind = fn ((), _) => ()} ()
adamc@38 537
adamc@38 538 fun map {kind, con, sgn_item, sgn} s =
adamc@38 539 case mapfold {kind = fn k => fn () => S.Continue (kind k, ()),
adamc@38 540 con = fn c => fn () => S.Continue (con c, ()),
adamc@38 541 sgn_item = fn si => fn () => S.Continue (sgn_item si, ()),
adamc@38 542 sgn = fn s => fn () => S.Continue (sgn s, ())} s () of
adamc@38 543 S.Return () => raise Fail "Expl_util.Sgn.map"
adamc@38 544 | S.Continue (s, ()) => s
adamc@38 545
adamc@38 546 end
adamc@38 547
adamc@38 548 end