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Abstracting datatypes with signature ascription
author Adam Chlipala <adamc@hcoop.net>
date Thu, 24 Jul 2008 16:41:12 -0400
parents b4b70de488e9
children 870e8abbe3b9
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 Elaborate :> ELABORATE = struct
adamc@2 29
adamc@14 30 structure P = Prim
adamc@4 31 structure L = Source
adamc@2 32 structure L' = Elab
adamc@2 33 structure E = ElabEnv
adamc@2 34 structure U = ElabUtil
adamc@82 35 structure D = Disjoint
adamc@2 36
adamc@3 37 open Print
adamc@3 38 open ElabPrint
adamc@3 39
adamc@62 40 structure SS = BinarySetFn(struct
adamc@62 41 type ord_key = string
adamc@62 42 val compare = String.compare
adamc@62 43 end)
adamc@62 44
adamc@2 45 fun elabExplicitness e =
adamc@2 46 case e of
adamc@2 47 L.Explicit => L'.Explicit
adamc@2 48 | L.Implicit => L'.Implicit
adamc@2 49
adamc@2 50 fun occursKind r =
adamc@76 51 U.Kind.exists (fn L'.KUnif (_, _, r') => r = r'
adamc@2 52 | _ => false)
adamc@2 53
adamc@3 54 datatype kunify_error =
adamc@2 55 KOccursCheckFailed of L'.kind * L'.kind
adamc@2 56 | KIncompatible of L'.kind * L'.kind
adamc@2 57
adamc@3 58 exception KUnify' of kunify_error
adamc@3 59
adamc@3 60 fun kunifyError err =
adamc@2 61 case err of
adamc@2 62 KOccursCheckFailed (k1, k2) =>
adamc@3 63 eprefaces "Kind occurs check failed"
adamc@3 64 [("Kind 1", p_kind k1),
adamc@3 65 ("Kind 2", p_kind k2)]
adamc@2 66 | KIncompatible (k1, k2) =>
adamc@3 67 eprefaces "Incompatible kinds"
adamc@3 68 [("Kind 1", p_kind k1),
adamc@3 69 ("Kind 2", p_kind k2)]
adamc@2 70
adamc@3 71 fun unifyKinds' (k1All as (k1, _)) (k2All as (k2, _)) =
adamc@2 72 let
adamc@3 73 fun err f = raise KUnify' (f (k1All, k2All))
adamc@2 74 in
adamc@2 75 case (k1, k2) of
adamc@2 76 (L'.KType, L'.KType) => ()
adamc@82 77 | (L'.KUnit, L'.KUnit) => ()
adamc@82 78
adamc@2 79 | (L'.KArrow (d1, r1), L'.KArrow (d2, r2)) =>
adamc@3 80 (unifyKinds' d1 d2;
adamc@3 81 unifyKinds' r1 r2)
adamc@2 82 | (L'.KName, L'.KName) => ()
adamc@3 83 | (L'.KRecord k1, L'.KRecord k2) => unifyKinds' k1 k2
adamc@2 84
adamc@2 85 | (L'.KError, _) => ()
adamc@2 86 | (_, L'.KError) => ()
adamc@2 87
adamc@76 88 | (L'.KUnif (_, _, ref (SOME k1All)), _) => unifyKinds' k1All k2All
adamc@76 89 | (_, L'.KUnif (_, _, ref (SOME k2All))) => unifyKinds' k1All k2All
adamc@2 90
adamc@76 91 | (L'.KUnif (_, _, r1), L'.KUnif (_, _, r2)) =>
adamc@2 92 if r1 = r2 then
adamc@2 93 ()
adamc@2 94 else
adamc@2 95 r1 := SOME k2All
adamc@2 96
adamc@76 97 | (L'.KUnif (_, _, r), _) =>
adamc@2 98 if occursKind r k2All then
adamc@2 99 err KOccursCheckFailed
adamc@2 100 else
adamc@2 101 r := SOME k2All
adamc@76 102 | (_, L'.KUnif (_, _, r)) =>
adamc@2 103 if occursKind r k1All then
adamc@2 104 err KOccursCheckFailed
adamc@2 105 else
adamc@2 106 r := SOME k1All
adamc@2 107
adamc@2 108 | _ => err KIncompatible
adamc@2 109 end
adamc@2 110
adamc@3 111 exception KUnify of L'.kind * L'.kind * kunify_error
adamc@3 112
adamc@3 113 fun unifyKinds k1 k2 =
adamc@3 114 unifyKinds' k1 k2
adamc@3 115 handle KUnify' err => raise KUnify (k1, k2, err)
adamc@3 116
adamc@3 117 datatype con_error =
adamc@3 118 UnboundCon of ErrorMsg.span * string
adamc@157 119 | UnboundDatatype of ErrorMsg.span * string
adamc@34 120 | UnboundStrInCon of ErrorMsg.span * string
adamc@3 121 | WrongKind of L'.con * L'.kind * L'.kind * kunify_error
adamc@67 122 | DuplicateField of ErrorMsg.span * string
adamc@3 123
adamc@5 124 fun conError env err =
adamc@3 125 case err of
adamc@3 126 UnboundCon (loc, s) =>
adamc@3 127 ErrorMsg.errorAt loc ("Unbound constructor variable " ^ s)
adamc@157 128 | UnboundDatatype (loc, s) =>
adamc@157 129 ErrorMsg.errorAt loc ("Unbound datatype " ^ s)
adamc@34 130 | UnboundStrInCon (loc, s) =>
adamc@34 131 ErrorMsg.errorAt loc ("Unbound structure " ^ s)
adamc@3 132 | WrongKind (c, k1, k2, kerr) =>
adamc@3 133 (ErrorMsg.errorAt (#2 c) "Wrong kind";
adamc@5 134 eprefaces' [("Constructor", p_con env c),
adamc@5 135 ("Have kind", p_kind k1),
adamc@5 136 ("Need kind", p_kind k2)];
adamc@3 137 kunifyError kerr)
adamc@67 138 | DuplicateField (loc, s) =>
adamc@67 139 ErrorMsg.errorAt loc ("Duplicate record field " ^ s)
adamc@3 140
adamc@5 141 fun checkKind env c k1 k2 =
adamc@3 142 unifyKinds k1 k2
adamc@3 143 handle KUnify (k1, k2, err) =>
adamc@5 144 conError env (WrongKind (c, k1, k2, err))
adamc@3 145
adamc@3 146 val dummy = ErrorMsg.dummySpan
adamc@3 147
adamc@3 148 val ktype = (L'.KType, dummy)
adamc@3 149 val kname = (L'.KName, dummy)
adamc@12 150 val ktype_record = (L'.KRecord ktype, dummy)
adamc@3 151
adamc@3 152 val cerror = (L'.CError, dummy)
adamc@3 153 val kerror = (L'.KError, dummy)
adamc@10 154 val eerror = (L'.EError, dummy)
adamc@31 155 val sgnerror = (L'.SgnError, dummy)
adamc@31 156 val strerror = (L'.StrError, dummy)
adamc@3 157
adamc@56 158 val int = ref cerror
adamc@56 159 val float = ref cerror
adamc@56 160 val string = ref cerror
adamc@56 161
adamc@3 162 local
adamc@3 163 val count = ref 0
adamc@3 164 in
adamc@3 165
adamc@3 166 fun resetKunif () = count := 0
adamc@3 167
adamc@76 168 fun kunif loc =
adamc@3 169 let
adamc@3 170 val n = !count
adamc@3 171 val s = if n <= 26 then
adamc@3 172 str (chr (ord #"A" + n))
adamc@3 173 else
adamc@3 174 "U" ^ Int.toString (n - 26)
adamc@3 175 in
adamc@3 176 count := n + 1;
adamc@76 177 (L'.KUnif (loc, s, ref NONE), dummy)
adamc@3 178 end
adamc@3 179
adamc@3 180 end
adamc@3 181
adamc@10 182 local
adamc@10 183 val count = ref 0
adamc@10 184 in
adamc@10 185
adamc@10 186 fun resetCunif () = count := 0
adamc@10 187
adamc@76 188 fun cunif (loc, k) =
adamc@10 189 let
adamc@10 190 val n = !count
adamc@10 191 val s = if n <= 26 then
adamc@10 192 str (chr (ord #"A" + n))
adamc@10 193 else
adamc@10 194 "U" ^ Int.toString (n - 26)
adamc@10 195 in
adamc@10 196 count := n + 1;
adamc@76 197 (L'.CUnif (loc, k, s, ref NONE), dummy)
adamc@10 198 end
adamc@10 199
adamc@10 200 end
adamc@10 201
adamc@18 202 fun elabKind (k, loc) =
adamc@18 203 case k of
adamc@18 204 L.KType => (L'.KType, loc)
adamc@18 205 | L.KArrow (k1, k2) => (L'.KArrow (elabKind k1, elabKind k2), loc)
adamc@18 206 | L.KName => (L'.KName, loc)
adamc@18 207 | L.KRecord k => (L'.KRecord (elabKind k), loc)
adamc@82 208 | L.KUnit => (L'.KUnit, loc)
adamc@76 209 | L.KWild => kunif loc
adamc@18 210
adamc@67 211 fun foldKind (dom, ran, loc)=
adamc@67 212 (L'.KArrow ((L'.KArrow ((L'.KName, loc),
adamc@67 213 (L'.KArrow (dom,
adamc@67 214 (L'.KArrow (ran, ran), loc)), loc)), loc),
adamc@67 215 (L'.KArrow (ran,
adamc@67 216 (L'.KArrow ((L'.KRecord dom, loc),
adamc@67 217 ran), loc)), loc)), loc)
adamc@67 218
adamc@83 219 fun elabCon (env, denv) (c, loc) =
adamc@3 220 case c of
adamc@3 221 L.CAnnot (c, k) =>
adamc@3 222 let
adamc@3 223 val k' = elabKind k
adamc@83 224 val (c', ck, gs) = elabCon (env, denv) c
adamc@3 225 in
adamc@5 226 checkKind env c' ck k';
adamc@83 227 (c', k', gs)
adamc@3 228 end
adamc@3 229
adamc@3 230 | L.TFun (t1, t2) =>
adamc@3 231 let
adamc@83 232 val (t1', k1, gs1) = elabCon (env, denv) t1
adamc@83 233 val (t2', k2, gs2) = elabCon (env, denv) t2
adamc@3 234 in
adamc@5 235 checkKind env t1' k1 ktype;
adamc@5 236 checkKind env t2' k2 ktype;
adamc@83 237 ((L'.TFun (t1', t2'), loc), ktype, gs1 @ gs2)
adamc@3 238 end
adamc@3 239 | L.TCFun (e, x, k, t) =>
adamc@3 240 let
adamc@3 241 val e' = elabExplicitness e
adamc@3 242 val k' = elabKind k
adamc@3 243 val env' = E.pushCRel env x k'
adamc@83 244 val (t', tk, gs) = elabCon (env', D.enter denv) t
adamc@3 245 in
adamc@5 246 checkKind env t' tk ktype;
adamc@83 247 ((L'.TCFun (e', x, k', t'), loc), ktype, gs)
adamc@3 248 end
adamc@85 249 | L.TDisjoint (c1, c2, c) =>
adamc@85 250 let
adamc@85 251 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@85 252 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@85 253
adamc@85 254 val ku1 = kunif loc
adamc@85 255 val ku2 = kunif loc
adamc@85 256
adamc@90 257 val (denv', gs3) = D.assert env denv (c1', c2')
adamc@90 258 val (c', k, gs4) = elabCon (env, denv') c
adamc@85 259 in
adamc@85 260 checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@85 261 checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@85 262
adamc@90 263 ((L'.TDisjoint (c1', c2', c'), loc), k, gs1 @ gs2 @ gs3 @ gs4)
adamc@85 264 end
adamc@3 265 | L.TRecord c =>
adamc@3 266 let
adamc@83 267 val (c', ck, gs) = elabCon (env, denv) c
adamc@3 268 val k = (L'.KRecord ktype, loc)
adamc@3 269 in
adamc@5 270 checkKind env c' ck k;
adamc@83 271 ((L'.TRecord c', loc), ktype, gs)
adamc@3 272 end
adamc@3 273
adamc@34 274 | L.CVar ([], s) =>
adamc@3 275 (case E.lookupC env s of
adamc@9 276 E.NotBound =>
adamc@5 277 (conError env (UnboundCon (loc, s));
adamc@83 278 (cerror, kerror, []))
adamc@9 279 | E.Rel (n, k) =>
adamc@83 280 ((L'.CRel n, loc), k, [])
adamc@9 281 | E.Named (n, k) =>
adamc@83 282 ((L'.CNamed n, loc), k, []))
adamc@34 283 | L.CVar (m1 :: ms, s) =>
adamc@34 284 (case E.lookupStr env m1 of
adamc@42 285 NONE => (conError env (UnboundStrInCon (loc, m1));
adamc@83 286 (cerror, kerror, []))
adamc@34 287 | SOME (n, sgn) =>
adamc@34 288 let
adamc@34 289 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34 290 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34 291 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@34 292 (strerror, sgnerror))
adamc@34 293 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34 294 ((L'.StrVar n, loc), sgn) ms
adamc@34 295
adamc@34 296 val k = case E.projectCon env {sgn = sgn, str = str, field = s} of
adamc@34 297 NONE => (conError env (UnboundCon (loc, s));
adamc@34 298 kerror)
adamc@34 299 | SOME (k, _) => k
adamc@34 300 in
adamc@83 301 ((L'.CModProj (n, ms, s), loc), k, [])
adamc@34 302 end)
adamc@34 303
adamc@3 304 | L.CApp (c1, c2) =>
adamc@3 305 let
adamc@83 306 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@83 307 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@76 308 val dom = kunif loc
adamc@76 309 val ran = kunif loc
adamc@3 310 in
adamc@5 311 checkKind env c1' k1 (L'.KArrow (dom, ran), loc);
adamc@5 312 checkKind env c2' k2 dom;
adamc@83 313 ((L'.CApp (c1', c2'), loc), ran, gs1 @ gs2)
adamc@3 314 end
adamc@67 315 | L.CAbs (x, ko, t) =>
adamc@3 316 let
adamc@67 317 val k' = case ko of
adamc@76 318 NONE => kunif loc
adamc@67 319 | SOME k => elabKind k
adamc@3 320 val env' = E.pushCRel env x k'
adamc@83 321 val (t', tk, gs) = elabCon (env', D.enter denv) t
adamc@3 322 in
adamc@8 323 ((L'.CAbs (x, k', t'), loc),
adamc@83 324 (L'.KArrow (k', tk), loc),
adamc@83 325 gs)
adamc@3 326 end
adamc@3 327
adamc@84 328 | L.CDisjoint (c1, c2, c) =>
adamc@84 329 let
adamc@84 330 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@84 331 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@84 332
adamc@84 333 val ku1 = kunif loc
adamc@84 334 val ku2 = kunif loc
adamc@84 335
adamc@90 336 val (denv', gs3) = D.assert env denv (c1', c2')
adamc@90 337 val (c', k, gs4) = elabCon (env, denv') c
adamc@84 338 in
adamc@84 339 checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@84 340 checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@84 341
adamc@90 342 ((L'.CDisjoint (c1', c2', c'), loc), k, gs1 @ gs2 @ gs3 @ gs4)
adamc@84 343 end
adamc@84 344
adamc@3 345 | L.CName s =>
adamc@83 346 ((L'.CName s, loc), kname, [])
adamc@3 347
adamc@3 348 | L.CRecord xcs =>
adamc@3 349 let
adamc@76 350 val k = kunif loc
adamc@3 351
adamc@83 352 val (xcs', gs) = ListUtil.foldlMap (fn ((x, c), gs) =>
adamc@83 353 let
adamc@83 354 val (x', xk, gs1) = elabCon (env, denv) x
adamc@83 355 val (c', ck, gs2) = elabCon (env, denv) c
adamc@83 356 in
adamc@83 357 checkKind env x' xk kname;
adamc@83 358 checkKind env c' ck k;
adamc@83 359 ((x', c'), gs1 @ gs2 @ gs)
adamc@83 360 end) [] xcs
adamc@67 361
adamc@67 362 val rc = (L'.CRecord (k, xcs'), loc)
adamc@67 363 (* Add duplicate field checking later. *)
adamc@83 364
adamc@83 365 fun prove (xcs, ds) =
adamc@83 366 case xcs of
adamc@83 367 [] => ds
adamc@83 368 | xc :: rest =>
adamc@83 369 let
adamc@83 370 val r1 = (L'.CRecord (k, [xc]), loc)
adamc@83 371 val ds = foldl (fn (xc', ds) =>
adamc@83 372 let
adamc@83 373 val r2 = (L'.CRecord (k, [xc']), loc)
adamc@83 374 in
adamc@90 375 D.prove env denv (r1, r2, loc) @ ds
adamc@83 376 end)
adamc@83 377 ds rest
adamc@83 378 in
adamc@83 379 prove (rest, ds)
adamc@83 380 end
adamc@3 381 in
adamc@83 382 (rc, (L'.KRecord k, loc), prove (xcs', gs))
adamc@3 383 end
adamc@3 384 | L.CConcat (c1, c2) =>
adamc@3 385 let
adamc@83 386 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@83 387 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@76 388 val ku = kunif loc
adamc@3 389 val k = (L'.KRecord ku, loc)
adamc@3 390 in
adamc@5 391 checkKind env c1' k1 k;
adamc@5 392 checkKind env c2' k2 k;
adamc@83 393 ((L'.CConcat (c1', c2'), loc), k,
adamc@90 394 D.prove env denv (c1', c2', loc) @ gs1 @ gs2)
adamc@3 395 end
adamc@67 396 | L.CFold =>
adamc@67 397 let
adamc@76 398 val dom = kunif loc
adamc@76 399 val ran = kunif loc
adamc@67 400 in
adamc@67 401 ((L'.CFold (dom, ran), loc),
adamc@83 402 foldKind (dom, ran, loc),
adamc@83 403 [])
adamc@67 404 end
adamc@3 405
adamc@83 406 | L.CUnit => ((L'.CUnit, loc), (L'.KUnit, loc), [])
adamc@82 407
adamc@18 408 | L.CWild k =>
adamc@18 409 let
adamc@18 410 val k' = elabKind k
adamc@18 411 in
adamc@83 412 (cunif (loc, k'), k', [])
adamc@18 413 end
adamc@18 414
adamc@6 415 fun kunifsRemain k =
adamc@6 416 case k of
adamc@76 417 L'.KUnif (_, _, ref NONE) => true
adamc@6 418 | _ => false
adamc@10 419 fun cunifsRemain c =
adamc@10 420 case c of
adamc@76 421 L'.CUnif (loc, _, _, ref NONE) => SOME loc
adamc@76 422 | _ => NONE
adamc@6 423
adamc@76 424 val kunifsInDecl = U.Decl.exists {kind = kunifsRemain,
adamc@76 425 con = fn _ => false,
adamc@76 426 exp = fn _ => false,
adamc@76 427 sgn_item = fn _ => false,
adamc@76 428 sgn = fn _ => false,
adamc@76 429 str = fn _ => false,
adamc@76 430 decl = fn _ => false}
adamc@10 431
adamc@76 432 val cunifsInDecl = U.Decl.search {kind = fn _ => NONE,
adamc@76 433 con = cunifsRemain,
adamc@76 434 exp = fn _ => NONE,
adamc@76 435 sgn_item = fn _ => NONE,
adamc@76 436 sgn = fn _ => NONE,
adamc@76 437 str = fn _ => NONE,
adamc@76 438 decl = fn _ => NONE}
adamc@10 439
adamc@10 440 fun occursCon r =
adamc@10 441 U.Con.exists {kind = fn _ => false,
adamc@76 442 con = fn L'.CUnif (_, _, _, r') => r = r'
adamc@10 443 | _ => false}
adamc@10 444
adamc@10 445 datatype cunify_error =
adamc@10 446 CKind of L'.kind * L'.kind * kunify_error
adamc@10 447 | COccursCheckFailed of L'.con * L'.con
adamc@10 448 | CIncompatible of L'.con * L'.con
adamc@10 449 | CExplicitness of L'.con * L'.con
adamc@141 450 | CKindof of L'.kind * L'.con
adamc@153 451 | CRecordFailure of PD.pp_desc * PD.pp_desc
adamc@10 452
adamc@10 453 exception CUnify' of cunify_error
adamc@10 454
adamc@10 455 fun cunifyError env err =
adamc@10 456 case err of
adamc@10 457 CKind (k1, k2, kerr) =>
adamc@10 458 (eprefaces "Kind unification failure"
adamc@10 459 [("Kind 1", p_kind k1),
adamc@10 460 ("Kind 2", p_kind k2)];
adamc@10 461 kunifyError kerr)
adamc@10 462 | COccursCheckFailed (c1, c2) =>
adamc@10 463 eprefaces "Constructor occurs check failed"
adamc@10 464 [("Con 1", p_con env c1),
adamc@10 465 ("Con 2", p_con env c2)]
adamc@10 466 | CIncompatible (c1, c2) =>
adamc@10 467 eprefaces "Incompatible constructors"
adamc@10 468 [("Con 1", p_con env c1),
adamc@10 469 ("Con 2", p_con env c2)]
adamc@10 470 | CExplicitness (c1, c2) =>
adamc@10 471 eprefaces "Differing constructor function explicitness"
adamc@10 472 [("Con 1", p_con env c1),
adamc@10 473 ("Con 2", p_con env c2)]
adamc@141 474 | CKindof (k, c) =>
adamc@147 475 eprefaces "Unexpected kind for kindof calculation"
adamc@141 476 [("Kind", p_kind k),
adamc@141 477 ("Con", p_con env c)]
adamc@153 478 | CRecordFailure (s1, s2) =>
adamc@153 479 eprefaces "Can't unify record constructors"
adamc@153 480 [("Summary 1", s1),
adamc@153 481 ("Summary 2", s2)]
adamc@10 482
adamc@13 483 exception SynUnif = E.SynUnif
adamc@12 484
adamc@81 485 open ElabOps
adamc@43 486
adamc@12 487 type record_summary = {
adamc@12 488 fields : (L'.con * L'.con) list,
adamc@12 489 unifs : (L'.con * L'.con option ref) list,
adamc@12 490 others : L'.con list
adamc@12 491 }
adamc@12 492
adamc@12 493 fun summaryToCon {fields, unifs, others} =
adamc@12 494 let
adamc@12 495 val c = (L'.CRecord (ktype, []), dummy)
adamc@12 496 val c = List.foldr (fn (c', c) => (L'.CConcat (c', c), dummy)) c others
adamc@12 497 val c = List.foldr (fn ((c', _), c) => (L'.CConcat (c', c), dummy)) c unifs
adamc@12 498 in
adamc@12 499 (L'.CConcat ((L'.CRecord (ktype, fields), dummy), c), dummy)
adamc@12 500 end
adamc@12 501
adamc@12 502 fun p_summary env s = p_con env (summaryToCon s)
adamc@12 503
adamc@12 504 exception CUnify of L'.con * L'.con * cunify_error
adamc@12 505
adamc@12 506 fun hnormKind (kAll as (k, _)) =
adamc@12 507 case k of
adamc@76 508 L'.KUnif (_, _, ref (SOME k)) => hnormKind k
adamc@12 509 | _ => kAll
adamc@12 510
adamc@12 511 fun kindof env (c, loc) =
adamc@12 512 case c of
adamc@12 513 L'.TFun _ => ktype
adamc@12 514 | L'.TCFun _ => ktype
adamc@85 515 | L'.TDisjoint _ => ktype
adamc@12 516 | L'.TRecord _ => ktype
adamc@12 517
adamc@12 518 | L'.CRel xn => #2 (E.lookupCRel env xn)
adamc@12 519 | L'.CNamed xn => #2 (E.lookupCNamed env xn)
adamc@34 520 | L'.CModProj (n, ms, x) =>
adamc@34 521 let
adamc@34 522 val (_, sgn) = E.lookupStrNamed env n
adamc@34 523 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34 524 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34 525 NONE => raise Fail "kindof: Unknown substructure"
adamc@34 526 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34 527 ((L'.StrVar n, loc), sgn) ms
adamc@34 528 in
adamc@34 529 case E.projectCon env {sgn = sgn, str = str, field = x} of
adamc@34 530 NONE => raise Fail "kindof: Unknown con in structure"
adamc@34 531 | SOME (k, _) => k
adamc@34 532 end
adamc@34 533
adamc@12 534 | L'.CApp (c, _) =>
adamc@141 535 (case hnormKind (kindof env c) of
adamc@141 536 (L'.KArrow (_, k), _) => k
adamc@141 537 | (L'.KError, _) => kerror
adamc@141 538 | k => raise CUnify' (CKindof (k, c)))
adamc@12 539 | L'.CAbs (x, k, c) => (L'.KArrow (k, kindof (E.pushCRel env x k) c), loc)
adamc@84 540 | L'.CDisjoint (_, _, c) => kindof env c
adamc@12 541
adamc@12 542 | L'.CName _ => kname
adamc@12 543
adamc@12 544 | L'.CRecord (k, _) => (L'.KRecord k, loc)
adamc@12 545 | L'.CConcat (c, _) => kindof env c
adamc@67 546 | L'.CFold (dom, ran) => foldKind (dom, ran, loc)
adamc@12 547
adamc@82 548 | L'.CUnit => (L'.KUnit, loc)
adamc@82 549
adamc@12 550 | L'.CError => kerror
adamc@76 551 | L'.CUnif (_, k, _, _) => k
adamc@12 552
adamc@90 553 val hnormCon = D.hnormCon
adamc@86 554
adamc@86 555 fun unifyRecordCons (env, denv) (c1, c2) =
adamc@12 556 let
adamc@92 557 fun rkindof c =
adamc@147 558 case hnormKind (kindof env c) of
adamc@92 559 (L'.KRecord k, _) => k
adamc@141 560 | (L'.KError, _) => kerror
adamc@141 561 | k => raise CUnify' (CKindof (k, c))
adamc@92 562
adamc@92 563 val k1 = rkindof c1
adamc@92 564 val k2 = rkindof c2
adamc@86 565
adamc@86 566 val (r1, gs1) = recordSummary (env, denv) c1
adamc@86 567 val (r2, gs2) = recordSummary (env, denv) c2
adamc@12 568 in
adamc@12 569 unifyKinds k1 k2;
adamc@86 570 unifySummaries (env, denv) (k1, r1, r2);
adamc@86 571 gs1 @ gs2
adamc@12 572 end
adamc@12 573
adamc@86 574 and recordSummary (env, denv) c =
adamc@86 575 let
adamc@86 576 val (c, gs) = hnormCon (env, denv) c
adamc@12 577
adamc@86 578 val (sum, gs') =
adamc@86 579 case c of
adamc@86 580 (L'.CRecord (_, xcs), _) => ({fields = xcs, unifs = [], others = []}, [])
adamc@86 581 | (L'.CConcat (c1, c2), _) =>
adamc@86 582 let
adamc@86 583 val (s1, gs1) = recordSummary (env, denv) c1
adamc@86 584 val (s2, gs2) = recordSummary (env, denv) c2
adamc@86 585 in
adamc@86 586 ({fields = #fields s1 @ #fields s2,
adamc@86 587 unifs = #unifs s1 @ #unifs s2,
adamc@86 588 others = #others s1 @ #others s2},
adamc@86 589 gs1 @ gs2)
adamc@86 590 end
adamc@86 591 | (L'.CUnif (_, _, _, ref (SOME c)), _) => recordSummary (env, denv) c
adamc@86 592 | c' as (L'.CUnif (_, _, _, r), _) => ({fields = [], unifs = [(c', r)], others = []}, [])
adamc@86 593 | c' => ({fields = [], unifs = [], others = [c']}, [])
adamc@86 594 in
adamc@86 595 (sum, gs @ gs')
adamc@86 596 end
adamc@86 597
adamc@86 598 and consEq (env, denv) (c1, c2) =
adamc@86 599 (case unifyCons (env, denv) c1 c2 of
adamc@86 600 [] => true
adamc@86 601 | _ => false)
adamc@12 602 handle CUnify _ => false
adamc@12 603
adamc@80 604 and consNeq env (c1, c2) =
adamc@86 605 case (#1 (ElabOps.hnormCon env c1), #1 (ElabOps.hnormCon env c2)) of
adamc@80 606 (L'.CName x1, L'.CName x2) => x1 <> x2
adamc@80 607 | _ => false
adamc@80 608
adamc@86 609 and unifySummaries (env, denv) (k, s1 : record_summary, s2 : record_summary) =
adamc@12 610 let
adamc@14 611 (*val () = eprefaces "Summaries" [("#1", p_summary env s1),
adamc@14 612 ("#2", p_summary env s2)]*)
adamc@12 613
adamc@12 614 fun eatMatching p (ls1, ls2) =
adamc@12 615 let
adamc@12 616 fun em (ls1, ls2, passed1) =
adamc@12 617 case ls1 of
adamc@12 618 [] => (rev passed1, ls2)
adamc@12 619 | h1 :: t1 =>
adamc@12 620 let
adamc@12 621 fun search (ls2', passed2) =
adamc@12 622 case ls2' of
adamc@12 623 [] => em (t1, ls2, h1 :: passed1)
adamc@12 624 | h2 :: t2 =>
adamc@12 625 if p (h1, h2) then
adamc@12 626 em (t1, List.revAppend (passed2, t2), passed1)
adamc@12 627 else
adamc@12 628 search (t2, h2 :: passed2)
adamc@12 629 in
adamc@12 630 search (ls2, [])
adamc@12 631 end
adamc@12 632 in
adamc@12 633 em (ls1, ls2, [])
adamc@12 634 end
adamc@12 635
adamc@12 636 val (fs1, fs2) = eatMatching (fn ((x1, c1), (x2, c2)) =>
adamc@80 637 not (consNeq env (x1, x2))
adamc@86 638 andalso consEq (env, denv) (c1, c2)
adamc@86 639 andalso consEq (env, denv) (x1, x2))
adamc@79 640 (#fields s1, #fields s2)
adamc@14 641 (*val () = eprefaces "Summaries2" [("#1", p_summary env {fields = fs1, unifs = #unifs s1, others = #others s1}),
adamc@14 642 ("#2", p_summary env {fields = fs2, unifs = #unifs s2, others = #others s2})]*)
adamc@12 643 val (unifs1, unifs2) = eatMatching (fn ((_, r1), (_, r2)) => r1 = r2) (#unifs s1, #unifs s2)
adamc@86 644 val (others1, others2) = eatMatching (consEq (env, denv)) (#others s1, #others s2)
adamc@12 645
adamc@12 646 fun unifFields (fs, others, unifs) =
adamc@12 647 case (fs, others, unifs) of
adamc@12 648 ([], [], _) => ([], [], unifs)
adamc@12 649 | (_, _, []) => (fs, others, [])
adamc@12 650 | (_, _, (_, r) :: rest) =>
adamc@12 651 let
adamc@12 652 val r' = ref NONE
adamc@141 653 val kr = (L'.KRecord k, dummy)
adamc@141 654 val cr' = (L'.CUnif (dummy, kr, "recd", r'), dummy)
adamc@12 655
adamc@12 656 val prefix = case (fs, others) of
adamc@12 657 ([], other :: others) =>
adamc@12 658 List.foldl (fn (other, c) =>
adamc@12 659 (L'.CConcat (c, other), dummy))
adamc@12 660 other others
adamc@12 661 | (fs, []) =>
adamc@12 662 (L'.CRecord (k, fs), dummy)
adamc@12 663 | (fs, others) =>
adamc@12 664 List.foldl (fn (other, c) =>
adamc@12 665 (L'.CConcat (c, other), dummy))
adamc@12 666 (L'.CRecord (k, fs), dummy) others
adamc@12 667 in
adamc@12 668 r := SOME (L'.CConcat (prefix, cr'), dummy);
adamc@12 669 ([], [], (cr', r') :: rest)
adamc@12 670 end
adamc@12 671
adamc@12 672 val (fs1, others1, unifs2) = unifFields (fs1, others1, unifs2)
adamc@12 673 val (fs2, others2, unifs1) = unifFields (fs2, others2, unifs1)
adamc@12 674
adamc@86 675 val clear = case (fs1, others1, fs2, others2) of
adamc@86 676 ([], [], [], []) => true
adamc@12 677 | _ => false
adamc@12 678 val empty = (L'.CRecord (k, []), dummy)
adamc@12 679 fun pairOffUnifs (unifs1, unifs2) =
adamc@12 680 case (unifs1, unifs2) of
adamc@12 681 ([], _) =>
adamc@86 682 if clear then
adamc@12 683 List.app (fn (_, r) => r := SOME empty) unifs2
adamc@12 684 else
adamc@153 685 raise CUnify' (CRecordFailure (p_summary env s1, p_summary env s2))
adamc@12 686 | (_, []) =>
adamc@86 687 if clear then
adamc@12 688 List.app (fn (_, r) => r := SOME empty) unifs1
adamc@12 689 else
adamc@153 690 raise CUnify' (CRecordFailure (p_summary env s1, p_summary env s2))
adamc@12 691 | ((c1, _) :: rest1, (_, r2) :: rest2) =>
adamc@12 692 (r2 := SOME c1;
adamc@12 693 pairOffUnifs (rest1, rest2))
adamc@12 694 in
adamc@12 695 pairOffUnifs (unifs1, unifs2)
adamc@12 696 end
adamc@12 697
adamc@86 698 and unifyCons' (env, denv) c1 c2 =
adamc@86 699 let
adamc@86 700 val (c1, gs1) = hnormCon (env, denv) c1
adamc@86 701 val (c2, gs2) = hnormCon (env, denv) c2
adamc@90 702 val gs3 = unifyCons'' (env, denv) c1 c2
adamc@86 703 in
adamc@90 704 gs1 @ gs2 @ gs3
adamc@86 705 end
adamc@11 706
adamc@86 707 and unifyCons'' (env, denv) (c1All as (c1, _)) (c2All as (c2, _)) =
adamc@10 708 let
adamc@10 709 fun err f = raise CUnify' (f (c1All, c2All))
adamc@12 710
adamc@86 711 fun isRecord () = unifyRecordCons (env, denv) (c1All, c2All)
adamc@10 712 in
adamc@92 713 (*eprefaces "unifyCons''" [("c1All", p_con env c1All),
adamc@92 714 ("c2All", p_con env c2All)];*)
adamc@92 715
adamc@10 716 case (c1, c2) of
adamc@88 717 (L'.CUnit, L'.CUnit) => []
adamc@88 718
adamc@88 719 | (L'.TFun (d1, r1), L'.TFun (d2, r2)) =>
adamc@86 720 unifyCons' (env, denv) d1 d2
adamc@86 721 @ unifyCons' (env, denv) r1 r2
adamc@10 722 | (L'.TCFun (expl1, x1, d1, r1), L'.TCFun (expl2, _, d2, r2)) =>
adamc@10 723 if expl1 <> expl2 then
adamc@10 724 err CExplicitness
adamc@10 725 else
adamc@10 726 (unifyKinds d1 d2;
adamc@86 727 unifyCons' (E.pushCRel env x1 d1, D.enter denv) r1 r2)
adamc@86 728 | (L'.TRecord r1, L'.TRecord r2) => unifyCons' (env, denv) r1 r2
adamc@10 729
adamc@10 730 | (L'.CRel n1, L'.CRel n2) =>
adamc@10 731 if n1 = n2 then
adamc@86 732 []
adamc@10 733 else
adamc@10 734 err CIncompatible
adamc@10 735 | (L'.CNamed n1, L'.CNamed n2) =>
adamc@10 736 if n1 = n2 then
adamc@86 737 []
adamc@10 738 else
adamc@10 739 err CIncompatible
adamc@10 740
adamc@10 741 | (L'.CApp (d1, r1), L'.CApp (d2, r2)) =>
adamc@86 742 (unifyCons' (env, denv) d1 d2;
adamc@86 743 unifyCons' (env, denv) r1 r2)
adamc@10 744 | (L'.CAbs (x1, k1, c1), L'.CAbs (_, k2, c2)) =>
adamc@10 745 (unifyKinds k1 k2;
adamc@86 746 unifyCons' (E.pushCRel env x1 k1, D.enter denv) c1 c2)
adamc@10 747
adamc@10 748 | (L'.CName n1, L'.CName n2) =>
adamc@10 749 if n1 = n2 then
adamc@86 750 []
adamc@10 751 else
adamc@10 752 err CIncompatible
adamc@10 753
adamc@34 754 | (L'.CModProj (n1, ms1, x1), L'.CModProj (n2, ms2, x2)) =>
adamc@34 755 if n1 = n2 andalso ms1 = ms2 andalso x1 = x2 then
adamc@86 756 []
adamc@34 757 else
adamc@34 758 err CIncompatible
adamc@34 759
adamc@86 760 | (L'.CError, _) => []
adamc@86 761 | (_, L'.CError) => []
adamc@10 762
adamc@92 763 | (L'.CRecord _, _) => isRecord ()
adamc@92 764 | (_, L'.CRecord _) => isRecord ()
adamc@92 765 | (L'.CConcat _, _) => isRecord ()
adamc@92 766 | (_, L'.CConcat _) => isRecord ()
adamc@92 767 (*| (L'.CUnif (_, (L'.KRecord _, _), _, _), _) => isRecord ()
adamc@92 768 | (_, L'.CUnif (_, (L'.KRecord _, _), _, _)) => isRecord ()*)
adamc@10 769
adamc@76 770 | (L'.CUnif (_, k1, _, r1), L'.CUnif (_, k2, _, r2)) =>
adamc@10 771 if r1 = r2 then
adamc@86 772 []
adamc@10 773 else
adamc@10 774 (unifyKinds k1 k2;
adamc@86 775 r1 := SOME c2All;
adamc@86 776 [])
adamc@10 777
adamc@76 778 | (L'.CUnif (_, _, _, r), _) =>
adamc@10 779 if occursCon r c2All then
adamc@10 780 err COccursCheckFailed
adamc@10 781 else
adamc@86 782 (r := SOME c2All;
adamc@86 783 [])
adamc@76 784 | (_, L'.CUnif (_, _, _, r)) =>
adamc@10 785 if occursCon r c1All then
adamc@10 786 err COccursCheckFailed
adamc@10 787 else
adamc@86 788 (r := SOME c1All;
adamc@86 789 [])
adamc@10 790
adamc@12 791
adamc@71 792 | (L'.CFold (dom1, ran1), L'.CFold (dom2, ran2)) =>
adamc@71 793 (unifyKinds dom1 dom2;
adamc@86 794 unifyKinds ran1 ran2;
adamc@86 795 [])
adamc@71 796
adamc@10 797 | _ => err CIncompatible
adamc@10 798 end
adamc@10 799
adamc@86 800 and unifyCons (env, denv) c1 c2 =
adamc@86 801 unifyCons' (env, denv) c1 c2
adamc@10 802 handle CUnify' err => raise CUnify (c1, c2, err)
adamc@10 803 | KUnify args => raise CUnify (c1, c2, CKind args)
adamc@10 804
adamc@10 805 datatype exp_error =
adamc@10 806 UnboundExp of ErrorMsg.span * string
adamc@34 807 | UnboundStrInExp of ErrorMsg.span * string
adamc@10 808 | Unify of L'.exp * L'.con * L'.con * cunify_error
adamc@11 809 | Unif of string * L'.con
adamc@11 810 | WrongForm of string * L'.exp * L'.con
adamc@92 811 | IncompatibleCons of L'.con * L'.con
adamc@10 812
adamc@10 813 fun expError env err =
adamc@10 814 case err of
adamc@10 815 UnboundExp (loc, s) =>
adamc@10 816 ErrorMsg.errorAt loc ("Unbound expression variable " ^ s)
adamc@34 817 | UnboundStrInExp (loc, s) =>
adamc@34 818 ErrorMsg.errorAt loc ("Unbound structure " ^ s)
adamc@10 819 | Unify (e, c1, c2, uerr) =>
adamc@10 820 (ErrorMsg.errorAt (#2 e) "Unification failure";
adamc@10 821 eprefaces' [("Expression", p_exp env e),
adamc@10 822 ("Have con", p_con env c1),
adamc@10 823 ("Need con", p_con env c2)];
adamc@10 824 cunifyError env uerr)
adamc@11 825 | Unif (action, c) =>
adamc@11 826 (ErrorMsg.errorAt (#2 c) ("Unification variable blocks " ^ action);
adamc@11 827 eprefaces' [("Con", p_con env c)])
adamc@11 828 | WrongForm (variety, e, t) =>
adamc@11 829 (ErrorMsg.errorAt (#2 e) ("Expression is not a " ^ variety);
adamc@11 830 eprefaces' [("Expression", p_exp env e),
adamc@11 831 ("Type", p_con env t)])
adamc@92 832 | IncompatibleCons (c1, c2) =>
adamc@92 833 (ErrorMsg.errorAt (#2 c1) "Incompatible constructors";
adamc@92 834 eprefaces' [("Con 1", p_con env c1),
adamc@92 835 ("Con 2", p_con env c2)])
adamc@10 836
adamc@86 837 fun checkCon (env, denv) e c1 c2 =
adamc@86 838 unifyCons (env, denv) c1 c2
adamc@10 839 handle CUnify (c1, c2, err) =>
adamc@86 840 (expError env (Unify (e, c1, c2, err));
adamc@86 841 [])
adamc@10 842
adamc@14 843 fun primType env p =
adamc@56 844 case p of
adamc@56 845 P.Int _ => !int
adamc@56 846 | P.Float _ => !float
adamc@56 847 | P.String _ => !string
adamc@14 848
adamc@71 849 fun recCons (k, nm, v, rest, loc) =
adamc@71 850 (L'.CConcat ((L'.CRecord (k, [(nm, v)]), loc),
adamc@71 851 rest), loc)
adamc@71 852
adamc@71 853 fun foldType (dom, loc) =
adamc@71 854 (L'.TCFun (L'.Explicit, "ran", (L'.KArrow ((L'.KRecord dom, loc), (L'.KType, loc)), loc),
adamc@71 855 (L'.TFun ((L'.TCFun (L'.Explicit, "nm", (L'.KName, loc),
adamc@71 856 (L'.TCFun (L'.Explicit, "v", dom,
adamc@71 857 (L'.TCFun (L'.Explicit, "rest", (L'.KRecord dom, loc),
adamc@71 858 (L'.TFun ((L'.CApp ((L'.CRel 3, loc), (L'.CRel 0, loc)), loc),
adamc@71 859 (L'.CApp ((L'.CRel 3, loc),
adamc@71 860 recCons (dom,
adamc@71 861 (L'.CRel 2, loc),
adamc@71 862 (L'.CRel 1, loc),
adamc@71 863 (L'.CRel 0, loc),
adamc@71 864 loc)), loc)), loc)),
adamc@71 865 loc)), loc)), loc),
adamc@71 866 (L'.TFun ((L'.CApp ((L'.CRel 0, loc), (L'.CRecord (dom, []), loc)), loc),
adamc@71 867 (L'.TCFun (L'.Explicit, "r", (L'.KRecord dom, loc),
adamc@71 868 (L'.CApp ((L'.CRel 1, loc), (L'.CRel 0, loc)), loc)), loc)),
adamc@71 869 loc)), loc)), loc)
adamc@71 870
adamc@15 871 fun typeof env (e, loc) =
adamc@15 872 case e of
adamc@56 873 L'.EPrim p => primType env p
adamc@15 874 | L'.ERel n => #2 (E.lookupERel env n)
adamc@15 875 | L'.ENamed n => #2 (E.lookupENamed env n)
adamc@34 876 | L'.EModProj (n, ms, x) =>
adamc@34 877 let
adamc@34 878 val (_, sgn) = E.lookupStrNamed env n
adamc@34 879 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34 880 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@147 881 NONE => raise Fail "typeof: Unknown substructure"
adamc@34 882 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34 883 ((L'.StrVar n, loc), sgn) ms
adamc@34 884 in
adamc@34 885 case E.projectVal env {sgn = sgn, str = str, field = x} of
adamc@34 886 NONE => raise Fail "typeof: Unknown val in structure"
adamc@34 887 | SOME t => t
adamc@34 888 end
adamc@34 889
adamc@15 890 | L'.EApp (e1, _) =>
adamc@15 891 (case #1 (typeof env e1) of
adamc@15 892 L'.TFun (_, c) => c
adamc@15 893 | _ => raise Fail "typeof: Bad EApp")
adamc@26 894 | L'.EAbs (_, _, ran, _) => ran
adamc@15 895 | L'.ECApp (e1, c) =>
adamc@15 896 (case #1 (typeof env e1) of
adamc@15 897 L'.TCFun (_, _, _, c1) => subConInCon (0, c) c1
adamc@15 898 | _ => raise Fail "typeof: Bad ECApp")
adamc@15 899 | L'.ECAbs (expl, x, k, e1) => (L'.TCFun (expl, x, k, typeof (E.pushCRel env x k) e1), loc)
adamc@15 900
adamc@29 901 | L'.ERecord xes => (L'.TRecord (L'.CRecord (ktype, map (fn (x, _, t) => (x, t)) xes), loc), loc)
adamc@15 902 | L'.EField (_, _, {field, ...}) => field
adamc@149 903 | L'.ECut (_, _, {rest, ...}) => (L'.TRecord rest, loc)
adamc@71 904 | L'.EFold dom => foldType (dom, loc)
adamc@15 905
adamc@15 906 | L'.EError => cerror
adamc@15 907
adamc@86 908 fun elabHead (env, denv) (e as (_, loc)) t =
adamc@15 909 let
adamc@15 910 fun unravel (t, e) =
adamc@86 911 let
adamc@86 912 val (t, gs) = hnormCon (env, denv) t
adamc@86 913 in
adamc@86 914 case t of
adamc@86 915 (L'.TCFun (L'.Implicit, x, k, t'), _) =>
adamc@86 916 let
adamc@86 917 val u = cunif (loc, k)
adamc@86 918
adamc@86 919 val (e, t, gs') = unravel (subConInCon (0, u) t',
adamc@86 920 (L'.ECApp (e, u), loc))
adamc@86 921 in
adamc@86 922 (e, t, gs @ gs')
adamc@86 923 end
adamc@86 924 | _ => (e, t, gs)
adamc@86 925 end
adamc@15 926 in
adamc@15 927 unravel (t, e)
adamc@15 928 end
adamc@15 929
adamc@92 930 fun elabExp (env, denv) (eAll as (e, loc)) =
adamc@91 931 let
adamc@92 932
adamc@92 933 in
adamc@92 934 (*eprefaces "elabExp" [("eAll", SourcePrint.p_exp eAll)];*)
adamc@10 935
adamc@91 936 case e of
adamc@91 937 L.EAnnot (e, t) =>
adamc@91 938 let
adamc@91 939 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 940 val (t', _, gs2) = elabCon (env, denv) t
adamc@91 941 val gs3 = checkCon (env, denv) e' et t'
adamc@91 942 in
adamc@91 943 (e', t', gs1 @ gs2 @ gs3)
adamc@91 944 end
adamc@34 945
adamc@91 946 | L.EPrim p => ((L'.EPrim p, loc), primType env p, [])
adamc@91 947 | L.EVar ([], s) =>
adamc@91 948 (case E.lookupE env s of
adamc@91 949 E.NotBound =>
adamc@91 950 (expError env (UnboundExp (loc, s));
adamc@91 951 (eerror, cerror, []))
adamc@91 952 | E.Rel (n, t) => ((L'.ERel n, loc), t, [])
adamc@91 953 | E.Named (n, t) => ((L'.ENamed n, loc), t, []))
adamc@91 954 | L.EVar (m1 :: ms, s) =>
adamc@91 955 (case E.lookupStr env m1 of
adamc@91 956 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@91 957 (eerror, cerror, []))
adamc@91 958 | SOME (n, sgn) =>
adamc@91 959 let
adamc@91 960 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@91 961 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@91 962 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@91 963 (strerror, sgnerror))
adamc@91 964 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@91 965 ((L'.StrVar n, loc), sgn) ms
adamc@10 966
adamc@91 967 val t = case E.projectVal env {sgn = sgn, str = str, field = s} of
adamc@91 968 NONE => (expError env (UnboundExp (loc, s));
adamc@91 969 cerror)
adamc@91 970 | SOME t => t
adamc@91 971 in
adamc@91 972 ((L'.EModProj (n, ms, s), loc), t, [])
adamc@91 973 end)
adamc@86 974
adamc@91 975 | L.EApp (e1, e2) =>
adamc@91 976 let
adamc@91 977 val (e1', t1, gs1) = elabExp (env, denv) e1
adamc@91 978 val (e1', t1, gs2) = elabHead (env, denv) e1' t1
adamc@91 979 val (e2', t2, gs3) = elabExp (env, denv) e2
adamc@71 980
adamc@91 981 val dom = cunif (loc, ktype)
adamc@91 982 val ran = cunif (loc, ktype)
adamc@91 983 val t = (L'.TFun (dom, ran), dummy)
adamc@91 984
adamc@91 985 val gs4 = checkCon (env, denv) e1' t1 t
adamc@91 986 val gs5 = checkCon (env, denv) e2' t2 dom
adamc@91 987 in
adamc@91 988 ((L'.EApp (e1', e2'), loc), ran, gs1 @ gs2 @ gs3 @ gs4 @ gs5)
adamc@91 989 end
adamc@91 990 | L.EAbs (x, to, e) =>
adamc@91 991 let
adamc@91 992 val (t', gs1) = case to of
adamc@91 993 NONE => (cunif (loc, ktype), [])
adamc@91 994 | SOME t =>
adamc@91 995 let
adamc@91 996 val (t', tk, gs) = elabCon (env, denv) t
adamc@91 997 in
adamc@91 998 checkKind env t' tk ktype;
adamc@91 999 (t', gs)
adamc@91 1000 end
adamc@91 1001 val (e', et, gs2) = elabExp (E.pushERel env x t', denv) e
adamc@91 1002 in
adamc@91 1003 ((L'.EAbs (x, t', et, e'), loc),
adamc@91 1004 (L'.TFun (t', et), loc),
adamc@91 1005 gs1 @ gs2)
adamc@91 1006 end
adamc@91 1007 | L.ECApp (e, c) =>
adamc@91 1008 let
adamc@91 1009 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1010 val (e', et, gs2) = elabHead (env, denv) e' et
adamc@91 1011 val (c', ck, gs3) = elabCon (env, denv) c
adamc@91 1012 val ((et', _), gs4) = hnormCon (env, denv) et
adamc@91 1013 in
adamc@91 1014 case et' of
adamc@91 1015 L'.CError => (eerror, cerror, [])
adamc@91 1016 | L'.TCFun (_, _, k, eb) =>
adamc@91 1017 let
adamc@91 1018 val () = checkKind env c' ck k
adamc@91 1019 val eb' = subConInCon (0, c') eb
adamc@91 1020 handle SynUnif => (expError env (Unif ("substitution", eb));
adamc@91 1021 cerror)
adamc@91 1022 in
adamc@91 1023 ((L'.ECApp (e', c'), loc), eb', gs1 @ gs2 @ gs3 @ gs4)
adamc@91 1024 end
adamc@91 1025
adamc@91 1026 | L'.CUnif _ =>
adamc@91 1027 (expError env (Unif ("application", et));
adamc@91 1028 (eerror, cerror, []))
adamc@91 1029
adamc@91 1030 | _ =>
adamc@91 1031 (expError env (WrongForm ("constructor function", e', et));
adamc@91 1032 (eerror, cerror, []))
adamc@91 1033 end
adamc@91 1034 | L.ECAbs (expl, x, k, e) =>
adamc@91 1035 let
adamc@91 1036 val expl' = elabExplicitness expl
adamc@91 1037 val k' = elabKind k
adamc@91 1038 val (e', et, gs) = elabExp (E.pushCRel env x k', D.enter denv) e
adamc@91 1039 in
adamc@91 1040 ((L'.ECAbs (expl', x, k', e'), loc),
adamc@91 1041 (L'.TCFun (expl', x, k', et), loc),
adamc@91 1042 gs)
adamc@91 1043 end
adamc@91 1044
adamc@91 1045 | L.EDisjoint (c1, c2, e) =>
adamc@91 1046 let
adamc@91 1047 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@91 1048 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@91 1049
adamc@91 1050 val ku1 = kunif loc
adamc@91 1051 val ku2 = kunif loc
adamc@91 1052
adamc@91 1053 val (denv', gs3) = D.assert env denv (c1', c2')
adamc@91 1054 val (e', t, gs4) = elabExp (env, denv') e
adamc@91 1055 in
adamc@91 1056 checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@91 1057 checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@91 1058
adamc@91 1059 (e', (L'.TDisjoint (c1', c2', t), loc), gs1 @ gs2 @ gs3 @ gs4)
adamc@91 1060 end
adamc@91 1061
adamc@91 1062 | L.ERecord xes =>
adamc@91 1063 let
adamc@91 1064 val (xes', gs) = ListUtil.foldlMap (fn ((x, e), gs) =>
adamc@91 1065 let
adamc@91 1066 val (x', xk, gs1) = elabCon (env, denv) x
adamc@91 1067 val (e', et, gs2) = elabExp (env, denv) e
adamc@91 1068 in
adamc@91 1069 checkKind env x' xk kname;
adamc@91 1070 ((x', e', et), gs1 @ gs2 @ gs)
adamc@91 1071 end)
adamc@91 1072 [] xes
adamc@91 1073
adamc@91 1074 val k = (L'.KType, loc)
adamc@91 1075
adamc@91 1076 fun prove (xets, gs) =
adamc@91 1077 case xets of
adamc@91 1078 [] => gs
adamc@91 1079 | (x, _, t) :: rest =>
adamc@91 1080 let
adamc@91 1081 val xc = (x, t)
adamc@91 1082 val r1 = (L'.CRecord (k, [xc]), loc)
adamc@91 1083 val gs = foldl (fn ((x', _, t'), gs) =>
adamc@91 1084 let
adamc@91 1085 val xc' = (x', t')
adamc@91 1086 val r2 = (L'.CRecord (k, [xc']), loc)
adamc@91 1087 in
adamc@91 1088 D.prove env denv (r1, r2, loc) @ gs
adamc@91 1089 end)
adamc@91 1090 gs rest
adamc@91 1091 in
adamc@91 1092 prove (rest, gs)
adamc@91 1093 end
adamc@91 1094 in
adamc@91 1095 ((L'.ERecord xes', loc),
adamc@91 1096 (L'.TRecord (L'.CRecord (ktype, map (fn (x', _, et) => (x', et)) xes'), loc), loc),
adamc@91 1097 prove (xes', gs))
adamc@91 1098 end
adamc@91 1099
adamc@91 1100 | L.EField (e, c) =>
adamc@91 1101 let
adamc@91 1102 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1103 val (c', ck, gs2) = elabCon (env, denv) c
adamc@91 1104
adamc@91 1105 val ft = cunif (loc, ktype)
adamc@91 1106 val rest = cunif (loc, ktype_record)
adamc@91 1107 val first = (L'.CRecord (ktype, [(c', ft)]), loc)
adamc@91 1108
adamc@91 1109 val gs3 =
adamc@91 1110 checkCon (env, denv) e' et
adamc@91 1111 (L'.TRecord (L'.CConcat (first, rest), loc), loc)
adamc@91 1112 val gs4 = D.prove env denv (first, rest, loc)
adamc@91 1113 in
adamc@91 1114 ((L'.EField (e', c', {field = ft, rest = rest}), loc), ft, gs1 @ gs2 @ gs3 @ gs4)
adamc@91 1115 end
adamc@91 1116
adamc@149 1117 | L.ECut (e, c) =>
adamc@149 1118 let
adamc@149 1119 val (e', et, gs1) = elabExp (env, denv) e
adamc@149 1120 val (c', ck, gs2) = elabCon (env, denv) c
adamc@149 1121
adamc@149 1122 val ft = cunif (loc, ktype)
adamc@149 1123 val rest = cunif (loc, ktype_record)
adamc@149 1124 val first = (L'.CRecord (ktype, [(c', ft)]), loc)
adamc@149 1125
adamc@149 1126 val gs3 =
adamc@149 1127 checkCon (env, denv) e' et
adamc@149 1128 (L'.TRecord (L'.CConcat (first, rest), loc), loc)
adamc@149 1129 val gs4 = D.prove env denv (first, rest, loc)
adamc@149 1130 in
adamc@149 1131 ((L'.ECut (e', c', {field = ft, rest = rest}), loc), (L'.TRecord rest, loc), gs1 @ gs2 @ gs3 @ gs4)
adamc@149 1132 end
adamc@149 1133
adamc@91 1134 | L.EFold =>
adamc@91 1135 let
adamc@91 1136 val dom = kunif loc
adamc@91 1137 in
adamc@91 1138 ((L'.EFold dom, loc), foldType (dom, loc), [])
adamc@91 1139 end
adamc@91 1140 end
adamc@12 1141
adamc@12 1142
adamc@6 1143 datatype decl_error =
adamc@91 1144 KunifsRemain of L'.decl list
adamc@91 1145 | CunifsRemain of L'.decl list
adamc@91 1146
adamc@91 1147 fun lspan [] = ErrorMsg.dummySpan
adamc@91 1148 | lspan ((_, loc) :: _) = loc
adamc@6 1149
adamc@6 1150 fun declError env err =
adamc@6 1151 case err of
adamc@91 1152 KunifsRemain ds =>
adamc@91 1153 (ErrorMsg.errorAt (lspan ds) "Some kind unification variables are undetermined in declaration";
adamc@91 1154 eprefaces' [("Decl", p_list_sep PD.newline (p_decl env) ds)])
adamc@91 1155 | CunifsRemain ds =>
adamc@91 1156 (ErrorMsg.errorAt (lspan ds) "Some constructor unification variables are undetermined in declaration";
adamc@91 1157 eprefaces' [("Decl", p_list_sep PD.newline (p_decl env) ds)])
adamc@6 1158
adamc@31 1159 datatype sgn_error =
adamc@31 1160 UnboundSgn of ErrorMsg.span * string
adamc@31 1161 | UnmatchedSgi of L'.sgn_item
adamc@31 1162 | SgiWrongKind of L'.sgn_item * L'.kind * L'.sgn_item * L'.kind * kunify_error
adamc@31 1163 | SgiWrongCon of L'.sgn_item * L'.con * L'.sgn_item * L'.con * cunify_error
adamc@156 1164 | SgiMismatchedDatatypes of L'.sgn_item * L'.sgn_item * (L'.con * L'.con * cunify_error) option
adamc@41 1165 | SgnWrongForm of L'.sgn * L'.sgn
adamc@42 1166 | UnWhereable of L'.sgn * string
adamc@75 1167 | WhereWrongKind of L'.kind * L'.kind * kunify_error
adamc@58 1168 | NotIncludable of L'.sgn
adamc@62 1169 | DuplicateCon of ErrorMsg.span * string
adamc@62 1170 | DuplicateVal of ErrorMsg.span * string
adamc@62 1171 | DuplicateSgn of ErrorMsg.span * string
adamc@62 1172 | DuplicateStr of ErrorMsg.span * string
adamc@88 1173 | NotConstraintsable of L'.sgn
adamc@31 1174
adamc@31 1175 fun sgnError env err =
adamc@31 1176 case err of
adamc@31 1177 UnboundSgn (loc, s) =>
adamc@31 1178 ErrorMsg.errorAt loc ("Unbound signature variable " ^ s)
adamc@31 1179 | UnmatchedSgi (sgi as (_, loc)) =>
adamc@31 1180 (ErrorMsg.errorAt loc "Unmatched signature item";
adamc@31 1181 eprefaces' [("Item", p_sgn_item env sgi)])
adamc@31 1182 | SgiWrongKind (sgi1, k1, sgi2, k2, kerr) =>
adamc@31 1183 (ErrorMsg.errorAt (#2 sgi1) "Kind unification failure in signature matching:";
adamc@59 1184 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59 1185 ("Need", p_sgn_item env sgi2),
adamc@31 1186 ("Kind 1", p_kind k1),
adamc@31 1187 ("Kind 2", p_kind k2)];
adamc@31 1188 kunifyError kerr)
adamc@31 1189 | SgiWrongCon (sgi1, c1, sgi2, c2, cerr) =>
adamc@31 1190 (ErrorMsg.errorAt (#2 sgi1) "Constructor unification failure in signature matching:";
adamc@59 1191 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59 1192 ("Need", p_sgn_item env sgi2),
adamc@31 1193 ("Con 1", p_con env c1),
adamc@31 1194 ("Con 2", p_con env c2)];
adamc@31 1195 cunifyError env cerr)
adamc@156 1196 | SgiMismatchedDatatypes (sgi1, sgi2, cerro) =>
adamc@156 1197 (ErrorMsg.errorAt (#2 sgi1) "Mismatched 'datatype' specifications:";
adamc@156 1198 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@156 1199 ("Need", p_sgn_item env sgi2)];
adamc@156 1200 Option.app (fn (c1, c2, ue) =>
adamc@156 1201 (eprefaces "Unification error"
adamc@156 1202 [("Con 1", p_con env c1),
adamc@156 1203 ("Con 2", p_con env c2)];
adamc@156 1204 cunifyError env ue)) cerro)
adamc@41 1205 | SgnWrongForm (sgn1, sgn2) =>
adamc@41 1206 (ErrorMsg.errorAt (#2 sgn1) "Incompatible signatures:";
adamc@41 1207 eprefaces' [("Sig 1", p_sgn env sgn1),
adamc@41 1208 ("Sig 2", p_sgn env sgn2)])
adamc@42 1209 | UnWhereable (sgn, x) =>
adamc@42 1210 (ErrorMsg.errorAt (#2 sgn) "Unavailable field for 'where'";
adamc@42 1211 eprefaces' [("Signature", p_sgn env sgn),
adamc@42 1212 ("Field", PD.string x)])
adamc@75 1213 | WhereWrongKind (k1, k2, kerr) =>
adamc@75 1214 (ErrorMsg.errorAt (#2 k1) "Wrong kind for 'where'";
adamc@75 1215 eprefaces' [("Have", p_kind k1),
adamc@75 1216 ("Need", p_kind k2)];
adamc@75 1217 kunifyError kerr)
adamc@58 1218 | NotIncludable sgn =>
adamc@58 1219 (ErrorMsg.errorAt (#2 sgn) "Invalid signature to 'include'";
adamc@58 1220 eprefaces' [("Signature", p_sgn env sgn)])
adamc@62 1221 | DuplicateCon (loc, s) =>
adamc@62 1222 ErrorMsg.errorAt loc ("Duplicate constructor " ^ s ^ " in signature")
adamc@62 1223 | DuplicateVal (loc, s) =>
adamc@62 1224 ErrorMsg.errorAt loc ("Duplicate value " ^ s ^ " in signature")
adamc@62 1225 | DuplicateSgn (loc, s) =>
adamc@62 1226 ErrorMsg.errorAt loc ("Duplicate signature " ^ s ^ " in signature")
adamc@62 1227 | DuplicateStr (loc, s) =>
adamc@62 1228 ErrorMsg.errorAt loc ("Duplicate structure " ^ s ^ " in signature")
adamc@88 1229 | NotConstraintsable sgn =>
adamc@88 1230 (ErrorMsg.errorAt (#2 sgn) "Invalid signature for 'open constraints'";
adamc@88 1231 eprefaces' [("Signature", p_sgn env sgn)])
adamc@31 1232
adamc@31 1233 datatype str_error =
adamc@31 1234 UnboundStr of ErrorMsg.span * string
adamc@44 1235 | NotFunctor of L'.sgn
adamc@46 1236 | FunctorRebind of ErrorMsg.span
adamc@61 1237 | UnOpenable of L'.sgn
adamc@75 1238 | NotType of L'.kind * (L'.kind * L'.kind * kunify_error)
adamc@156 1239 | DuplicateConstructor of string * ErrorMsg.span
adamc@158 1240 | NotDatatype of ErrorMsg.span
adamc@31 1241
adamc@31 1242 fun strError env err =
adamc@31 1243 case err of
adamc@31 1244 UnboundStr (loc, s) =>
adamc@31 1245 ErrorMsg.errorAt loc ("Unbound structure variable " ^ s)
adamc@44 1246 | NotFunctor sgn =>
adamc@44 1247 (ErrorMsg.errorAt (#2 sgn) "Application of non-functor";
adamc@44 1248 eprefaces' [("Signature", p_sgn env sgn)])
adamc@46 1249 | FunctorRebind loc =>
adamc@46 1250 ErrorMsg.errorAt loc "Attempt to rebind functor"
adamc@61 1251 | UnOpenable sgn =>
adamc@61 1252 (ErrorMsg.errorAt (#2 sgn) "Un-openable structure";
adamc@61 1253 eprefaces' [("Signature", p_sgn env sgn)])
adamc@75 1254 | NotType (k, (k1, k2, ue)) =>
adamc@75 1255 (ErrorMsg.errorAt (#2 k) "'val' type kind is not 'Type'";
adamc@75 1256 eprefaces' [("Kind", p_kind k),
adamc@75 1257 ("Subkind 1", p_kind k1),
adamc@75 1258 ("Subkind 2", p_kind k2)];
adamc@75 1259 kunifyError ue)
adamc@156 1260 | DuplicateConstructor (x, loc) =>
adamc@156 1261 ErrorMsg.errorAt loc ("Duplicate datatype constructor " ^ x)
adamc@158 1262 | NotDatatype loc =>
adamc@158 1263 ErrorMsg.errorAt loc "Trying to import non-datatype as a datatype"
adamc@31 1264
adamc@42 1265 val hnormSgn = E.hnormSgn
adamc@31 1266
adamc@88 1267 fun elabSgn_item ((sgi, loc), (env, denv, gs)) =
adamc@76 1268 case sgi of
adamc@76 1269 L.SgiConAbs (x, k) =>
adamc@76 1270 let
adamc@76 1271 val k' = elabKind k
adamc@31 1272
adamc@76 1273 val (env', n) = E.pushCNamed env x k' NONE
adamc@76 1274 in
adamc@88 1275 ([(L'.SgiConAbs (x, n, k'), loc)], (env', denv, gs))
adamc@76 1276 end
adamc@31 1277
adamc@76 1278 | L.SgiCon (x, ko, c) =>
adamc@76 1279 let
adamc@76 1280 val k' = case ko of
adamc@76 1281 NONE => kunif loc
adamc@76 1282 | SOME k => elabKind k
adamc@31 1283
adamc@83 1284 val (c', ck, gs') = elabCon (env, denv) c
adamc@76 1285 val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@76 1286 in
adamc@76 1287 checkKind env c' ck k';
adamc@31 1288
adamc@88 1289 ([(L'.SgiCon (x, n, k', c'), loc)], (env', denv, gs' @ gs))
adamc@76 1290 end
adamc@31 1291
adamc@157 1292 | L.SgiDatatype (x, xcs) =>
adamc@157 1293 let
adamc@157 1294 val k = (L'.KType, loc)
adamc@157 1295 val (env, n) = E.pushCNamed env x k NONE
adamc@157 1296 val t = (L'.CNamed n, loc)
adamc@157 1297
adamc@157 1298 val (xcs, (used, env, gs)) =
adamc@157 1299 ListUtil.foldlMap
adamc@157 1300 (fn ((x, to), (used, env, gs)) =>
adamc@157 1301 let
adamc@157 1302 val (to, t, gs') = case to of
adamc@157 1303 NONE => (NONE, t, gs)
adamc@157 1304 | SOME t' =>
adamc@157 1305 let
adamc@157 1306 val (t', tk, gs') = elabCon (env, denv) t'
adamc@157 1307 in
adamc@157 1308 checkKind env t' tk k;
adamc@157 1309 (SOME t', (L'.TFun (t', t), loc), gs' @ gs)
adamc@157 1310 end
adamc@157 1311
adamc@157 1312 val (env, n') = E.pushENamed env x t
adamc@157 1313 in
adamc@157 1314 if SS.member (used, x) then
adamc@157 1315 strError env (DuplicateConstructor (x, loc))
adamc@157 1316 else
adamc@157 1317 ();
adamc@157 1318 ((x, n', to), (SS.add (used, x), env, gs'))
adamc@157 1319 end)
adamc@157 1320 (SS.empty, env, []) xcs
adamc@157 1321 in
adamc@157 1322 ([(L'.SgiDatatype (x, n, xcs), loc)], (env, denv, gs))
adamc@157 1323 end
adamc@156 1324
adamc@158 1325 | L.SgiDatatypeImp (_, [], _) => raise Fail "Empty SgiDatatypeImp"
adamc@158 1326
adamc@158 1327 | L.SgiDatatypeImp (x, m1 :: ms, s) =>
adamc@158 1328 (case E.lookupStr env m1 of
adamc@158 1329 NONE => (strError env (UnboundStr (loc, m1));
adamc@158 1330 ([], (env, denv, gs)))
adamc@158 1331 | SOME (n, sgn) =>
adamc@158 1332 let
adamc@158 1333 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@158 1334 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@158 1335 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@158 1336 (strerror, sgnerror))
adamc@158 1337 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@158 1338 ((L'.StrVar n, loc), sgn) ms
adamc@158 1339 in
adamc@158 1340 case E.projectDatatype env {sgn = sgn, str = str, field = s} of
adamc@158 1341 NONE => (conError env (UnboundDatatype (loc, s));
adamc@158 1342 ([], (env, denv, gs)))
adamc@158 1343 | SOME xncs =>
adamc@158 1344 let
adamc@158 1345 val k = (L'.KType, loc)
adamc@158 1346 val t = (L'.CModProj (n, ms, s), loc)
adamc@158 1347 val (env, n') = E.pushCNamed env x k (SOME t)
adamc@158 1348 val env = E.pushDatatype env n' xncs
adamc@158 1349
adamc@158 1350 val t = (L'.CNamed n', loc)
adamc@158 1351 val env = foldl (fn ((x, n, to), env) =>
adamc@158 1352 let
adamc@158 1353 val t = case to of
adamc@158 1354 NONE => t
adamc@158 1355 | SOME t' => (L'.TFun (t', t), loc)
adamc@158 1356 in
adamc@158 1357 E.pushENamedAs env x n t
adamc@158 1358 end) env xncs
adamc@158 1359 in
adamc@158 1360 ([(L'.SgiDatatypeImp (x, n', n, ms, s), loc)], (env, denv, []))
adamc@158 1361 end
adamc@158 1362 end)
adamc@156 1363
adamc@76 1364 | L.SgiVal (x, c) =>
adamc@76 1365 let
adamc@83 1366 val (c', ck, gs') = elabCon (env, denv) c
adamc@31 1367
adamc@76 1368 val (env', n) = E.pushENamed env x c'
adamc@76 1369 in
adamc@76 1370 (unifyKinds ck ktype
adamc@76 1371 handle KUnify ue => strError env (NotType (ck, ue)));
adamc@31 1372
adamc@88 1373 ([(L'.SgiVal (x, n, c'), loc)], (env', denv, gs' @ gs))
adamc@76 1374 end
adamc@31 1375
adamc@76 1376 | L.SgiStr (x, sgn) =>
adamc@76 1377 let
adamc@83 1378 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 1379 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 1380 in
adamc@88 1381 ([(L'.SgiStr (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 1382 end
adamc@31 1383
adamc@76 1384 | L.SgiSgn (x, sgn) =>
adamc@76 1385 let
adamc@83 1386 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 1387 val (env', n) = E.pushSgnNamed env x sgn'
adamc@76 1388 in
adamc@88 1389 ([(L'.SgiSgn (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 1390 end
adamc@31 1391
adamc@76 1392 | L.SgiInclude sgn =>
adamc@76 1393 let
adamc@83 1394 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 1395 in
adamc@76 1396 case #1 (hnormSgn env sgn') of
adamc@76 1397 L'.SgnConst sgis =>
adamc@88 1398 (sgis, (foldl (fn (sgi, env) => E.sgiBinds env sgi) env sgis, denv, gs' @ gs))
adamc@76 1399 | _ => (sgnError env (NotIncludable sgn');
adamc@88 1400 ([], (env, denv, [])))
adamc@88 1401 end
adamc@88 1402
adamc@88 1403 | L.SgiConstraint (c1, c2) =>
adamc@88 1404 let
adamc@88 1405 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@88 1406 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@88 1407
adamc@90 1408 val (denv, gs3) = D.assert env denv (c1', c2')
adamc@88 1409 in
adamc@88 1410 checkKind env c1' k1 (L'.KRecord (kunif loc), loc);
adamc@88 1411 checkKind env c2' k2 (L'.KRecord (kunif loc), loc);
adamc@88 1412
adamc@90 1413 ([(L'.SgiConstraint (c1', c2'), loc)], (env, denv, gs1 @ gs2 @ gs3))
adamc@76 1414 end
adamc@31 1415
adamc@83 1416 and elabSgn (env, denv) (sgn, loc) =
adamc@31 1417 case sgn of
adamc@31 1418 L.SgnConst sgis =>
adamc@31 1419 let
adamc@88 1420 val (sgis', (_, _, gs)) = ListUtil.foldlMapConcat elabSgn_item (env, denv, []) sgis
adamc@62 1421
adamc@62 1422 val _ = foldl (fn ((sgi, loc), (cons, vals, sgns, strs)) =>
adamc@62 1423 case sgi of
adamc@62 1424 L'.SgiConAbs (x, _, _) =>
adamc@62 1425 (if SS.member (cons, x) then
adamc@62 1426 sgnError env (DuplicateCon (loc, x))
adamc@62 1427 else
adamc@62 1428 ();
adamc@62 1429 (SS.add (cons, x), vals, sgns, strs))
adamc@62 1430 | L'.SgiCon (x, _, _, _) =>
adamc@62 1431 (if SS.member (cons, x) then
adamc@62 1432 sgnError env (DuplicateCon (loc, x))
adamc@62 1433 else
adamc@62 1434 ();
adamc@62 1435 (SS.add (cons, x), vals, sgns, strs))
adamc@156 1436 | L'.SgiDatatype (x, _, xncs) =>
adamc@156 1437 let
adamc@156 1438 val vals = foldl (fn ((x, _, _), vals) =>
adamc@156 1439 (if SS.member (vals, x) then
adamc@156 1440 sgnError env (DuplicateVal (loc, x))
adamc@156 1441 else
adamc@156 1442 ();
adamc@156 1443 SS.add (vals, x)))
adamc@156 1444 vals xncs
adamc@156 1445 in
adamc@156 1446 if SS.member (cons, x) then
adamc@156 1447 sgnError env (DuplicateCon (loc, x))
adamc@156 1448 else
adamc@156 1449 ();
adamc@156 1450 (SS.add (cons, x), vals, sgns, strs)
adamc@156 1451 end
adamc@156 1452 | L'.SgiDatatypeImp (x, _, _, _, _) =>
adamc@156 1453 (if SS.member (cons, x) then
adamc@156 1454 sgnError env (DuplicateCon (loc, x))
adamc@156 1455 else
adamc@156 1456 ();
adamc@156 1457 (SS.add (cons, x), vals, sgns, strs))
adamc@62 1458 | L'.SgiVal (x, _, _) =>
adamc@62 1459 (if SS.member (vals, x) then
adamc@62 1460 sgnError env (DuplicateVal (loc, x))
adamc@62 1461 else
adamc@62 1462 ();
adamc@62 1463 (cons, SS.add (vals, x), sgns, strs))
adamc@62 1464 | L'.SgiSgn (x, _, _) =>
adamc@62 1465 (if SS.member (sgns, x) then
adamc@62 1466 sgnError env (DuplicateSgn (loc, x))
adamc@62 1467 else
adamc@62 1468 ();
adamc@62 1469 (cons, vals, SS.add (sgns, x), strs))
adamc@62 1470 | L'.SgiStr (x, _, _) =>
adamc@62 1471 (if SS.member (strs, x) then
adamc@62 1472 sgnError env (DuplicateStr (loc, x))
adamc@62 1473 else
adamc@62 1474 ();
adamc@88 1475 (cons, vals, sgns, SS.add (strs, x)))
adamc@88 1476 | L'.SgiConstraint _ => (cons, vals, sgns, strs))
adamc@62 1477 (SS.empty, SS.empty, SS.empty, SS.empty) sgis'
adamc@31 1478 in
adamc@83 1479 ((L'.SgnConst sgis', loc), gs)
adamc@31 1480 end
adamc@31 1481 | L.SgnVar x =>
adamc@31 1482 (case E.lookupSgn env x of
adamc@31 1483 NONE =>
adamc@31 1484 (sgnError env (UnboundSgn (loc, x));
adamc@83 1485 ((L'.SgnError, loc), []))
adamc@83 1486 | SOME (n, sgis) => ((L'.SgnVar n, loc), []))
adamc@41 1487 | L.SgnFun (m, dom, ran) =>
adamc@41 1488 let
adamc@83 1489 val (dom', gs1) = elabSgn (env, denv) dom
adamc@41 1490 val (env', n) = E.pushStrNamed env m dom'
adamc@83 1491 val (ran', gs2) = elabSgn (env', denv) ran
adamc@41 1492 in
adamc@83 1493 ((L'.SgnFun (m, n, dom', ran'), loc), gs1 @ gs2)
adamc@41 1494 end
adamc@42 1495 | L.SgnWhere (sgn, x, c) =>
adamc@42 1496 let
adamc@83 1497 val (sgn', ds1) = elabSgn (env, denv) sgn
adamc@83 1498 val (c', ck, ds2) = elabCon (env, denv) c
adamc@42 1499 in
adamc@42 1500 case #1 (hnormSgn env sgn') of
adamc@83 1501 L'.SgnError => (sgnerror, [])
adamc@42 1502 | L'.SgnConst sgis =>
adamc@75 1503 if List.exists (fn (L'.SgiConAbs (x', _, k), _) =>
adamc@75 1504 x' = x andalso
adamc@75 1505 (unifyKinds k ck
adamc@75 1506 handle KUnify x => sgnError env (WhereWrongKind x);
adamc@42 1507 true)
adamc@42 1508 | _ => false) sgis then
adamc@83 1509 ((L'.SgnWhere (sgn', x, c'), loc), ds1 @ ds2)
adamc@42 1510 else
adamc@42 1511 (sgnError env (UnWhereable (sgn', x));
adamc@83 1512 (sgnerror, []))
adamc@42 1513 | _ => (sgnError env (UnWhereable (sgn', x));
adamc@83 1514 (sgnerror, []))
adamc@42 1515 end
adamc@59 1516 | L.SgnProj (m, ms, x) =>
adamc@59 1517 (case E.lookupStr env m of
adamc@59 1518 NONE => (strError env (UnboundStr (loc, m));
adamc@83 1519 (sgnerror, []))
adamc@59 1520 | SOME (n, sgn) =>
adamc@59 1521 let
adamc@59 1522 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@59 1523 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@59 1524 NONE => (strError env (UnboundStr (loc, m));
adamc@59 1525 (strerror, sgnerror))
adamc@59 1526 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@59 1527 ((L'.StrVar n, loc), sgn) ms
adamc@59 1528 in
adamc@59 1529 case E.projectSgn env {sgn = sgn, str = str, field = x} of
adamc@59 1530 NONE => (sgnError env (UnboundSgn (loc, x));
adamc@83 1531 (sgnerror, []))
adamc@83 1532 | SOME _ => ((L'.SgnProj (n, ms, x), loc), [])
adamc@59 1533 end)
adamc@59 1534
adamc@31 1535
adamc@66 1536 fun selfify env {str, strs, sgn} =
adamc@66 1537 case #1 (hnormSgn env sgn) of
adamc@66 1538 L'.SgnError => sgn
adamc@66 1539 | L'.SgnVar _ => sgn
adamc@66 1540
adamc@66 1541 | L'.SgnConst sgis =>
adamc@66 1542 (L'.SgnConst (map (fn (L'.SgiConAbs (x, n, k), loc) =>
adamc@66 1543 (L'.SgiCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc)
adamc@158 1544 | (L'.SgiDatatype (x, n, xncs), loc) =>
adamc@158 1545 (L'.SgiDatatypeImp (x, n, str, strs, x), loc)
adamc@66 1546 | (L'.SgiStr (x, n, sgn), loc) =>
adamc@66 1547 (L'.SgiStr (x, n, selfify env {str = str, strs = strs @ [x], sgn = sgn}), loc)
adamc@66 1548 | x => x) sgis), #2 sgn)
adamc@66 1549 | L'.SgnFun _ => sgn
adamc@66 1550 | L'.SgnWhere _ => sgn
adamc@66 1551 | L'.SgnProj (m, ms, x) =>
adamc@66 1552 case E.projectSgn env {str = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66 1553 (L'.StrVar m, #2 sgn) ms,
adamc@66 1554 sgn = #2 (E.lookupStrNamed env m),
adamc@66 1555 field = x} of
adamc@66 1556 NONE => raise Fail "Elaborate.selfify: projectSgn returns NONE"
adamc@66 1557 | SOME sgn => selfify env {str = str, strs = strs, sgn = sgn}
adamc@66 1558
adamc@66 1559 fun selfifyAt env {str, sgn} =
adamc@66 1560 let
adamc@66 1561 fun self (str, _) =
adamc@66 1562 case str of
adamc@66 1563 L'.StrVar x => SOME (x, [])
adamc@66 1564 | L'.StrProj (str, x) =>
adamc@66 1565 (case self str of
adamc@66 1566 NONE => NONE
adamc@66 1567 | SOME (m, ms) => SOME (m, ms @ [x]))
adamc@66 1568 | _ => NONE
adamc@66 1569 in
adamc@66 1570 case self str of
adamc@66 1571 NONE => sgn
adamc@66 1572 | SOME (str, strs) => selfify env {sgn = sgn, str = str, strs = strs}
adamc@66 1573 end
adamc@66 1574
adamc@88 1575 fun dopen (env, denv) {str, strs, sgn} =
adamc@66 1576 let
adamc@66 1577 val m = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66 1578 (L'.StrVar str, #2 sgn) strs
adamc@66 1579 in
adamc@66 1580 case #1 (hnormSgn env sgn) of
adamc@66 1581 L'.SgnConst sgis =>
adamc@88 1582 ListUtil.foldlMap (fn ((sgi, loc), (env', denv')) =>
adamc@66 1583 case sgi of
adamc@66 1584 L'.SgiConAbs (x, n, k) =>
adamc@88 1585 let
adamc@88 1586 val c = (L'.CModProj (str, strs, x), loc)
adamc@88 1587 in
adamc@88 1588 ((L'.DCon (x, n, k, c), loc),
adamc@88 1589 (E.pushCNamedAs env' x n k (SOME c), denv'))
adamc@88 1590 end
adamc@66 1591 | L'.SgiCon (x, n, k, c) =>
adamc@66 1592 ((L'.DCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc),
adamc@88 1593 (E.pushCNamedAs env' x n k (SOME c), denv'))
adamc@156 1594 | L'.SgiDatatype (x, n, xncs) =>
adamc@156 1595 let
adamc@156 1596 val k = (L'.KType, loc)
adamc@156 1597 val c = (L'.CModProj (str, strs, x), loc)
adamc@156 1598 in
adamc@156 1599 ((L'.DDatatypeImp (x, n, str, strs, x), loc),
adamc@156 1600 (E.pushCNamedAs env' x n k (SOME c), denv'))
adamc@156 1601 end
adamc@156 1602 | L'.SgiDatatypeImp (x, n, m1, ms, x') =>
adamc@156 1603 let
adamc@156 1604 val k = (L'.KType, loc)
adamc@156 1605 val c = (L'.CModProj (m1, ms, x'), loc)
adamc@156 1606 in
adamc@156 1607 ((L'.DCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc),
adamc@156 1608 (E.pushCNamedAs env' x n k (SOME c), denv'))
adamc@156 1609 end
adamc@66 1610 | L'.SgiVal (x, n, t) =>
adamc@66 1611 ((L'.DVal (x, n, t, (L'.EModProj (str, strs, x), loc)), loc),
adamc@88 1612 (E.pushENamedAs env' x n t, denv'))
adamc@66 1613 | L'.SgiStr (x, n, sgn) =>
adamc@66 1614 ((L'.DStr (x, n, sgn, (L'.StrProj (m, x), loc)), loc),
adamc@88 1615 (E.pushStrNamedAs env' x n sgn, denv'))
adamc@66 1616 | L'.SgiSgn (x, n, sgn) =>
adamc@66 1617 ((L'.DSgn (x, n, (L'.SgnProj (str, strs, x), loc)), loc),
adamc@88 1618 (E.pushSgnNamedAs env' x n sgn, denv'))
adamc@88 1619 | L'.SgiConstraint (c1, c2) =>
adamc@88 1620 ((L'.DConstraint (c1, c2), loc),
adamc@156 1621 (env', denv)))
adamc@88 1622 (env, denv) sgis
adamc@66 1623 | _ => (strError env (UnOpenable sgn);
adamc@88 1624 ([], (env, denv)))
adamc@66 1625 end
adamc@66 1626
adamc@88 1627 fun dopenConstraints (loc, env, denv) {str, strs} =
adamc@88 1628 case E.lookupStr env str of
adamc@88 1629 NONE => (strError env (UnboundStr (loc, str));
adamc@88 1630 denv)
adamc@88 1631 | SOME (n, sgn) =>
adamc@88 1632 let
adamc@88 1633 val (st, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@88 1634 case E.projectStr env {str = str, sgn = sgn, field = m} of
adamc@88 1635 NONE => (strError env (UnboundStr (loc, m));
adamc@88 1636 (strerror, sgnerror))
adamc@88 1637 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@88 1638 ((L'.StrVar n, loc), sgn) strs
adamc@88 1639
adamc@88 1640 val cso = E.projectConstraints env {sgn = sgn, str = st}
adamc@88 1641
adamc@88 1642 val denv = case cso of
adamc@88 1643 NONE => (strError env (UnboundStr (loc, str));
adamc@88 1644 denv)
adamc@90 1645 | SOME cs => foldl (fn ((c1, c2), denv) =>
adamc@90 1646 let
adamc@90 1647 val (denv, gs) = D.assert env denv (c1, c2)
adamc@90 1648 in
adamc@90 1649 case gs of
adamc@90 1650 [] => ()
adamc@90 1651 | _ => raise Fail "dopenConstraints: Sub-constraints remain";
adamc@90 1652
adamc@90 1653 denv
adamc@90 1654 end) denv cs
adamc@88 1655 in
adamc@88 1656 denv
adamc@88 1657 end
adamc@88 1658
adamc@31 1659 fun sgiOfDecl (d, loc) =
adamc@31 1660 case d of
adamc@123 1661 L'.DCon (x, n, k, c) => [(L'.SgiCon (x, n, k, c), loc)]
adamc@156 1662 | L'.DDatatype x => [(L'.SgiDatatype x, loc)]
adamc@156 1663 | L'.DDatatypeImp x => [(L'.SgiDatatypeImp x, loc)]
adamc@123 1664 | L'.DVal (x, n, t, _) => [(L'.SgiVal (x, n, t), loc)]
adamc@123 1665 | L'.DValRec vis => map (fn (x, n, t, _) => (L'.SgiVal (x, n, t), loc)) vis
adamc@123 1666 | L'.DSgn (x, n, sgn) => [(L'.SgiSgn (x, n, sgn), loc)]
adamc@123 1667 | L'.DStr (x, n, sgn, _) => [(L'.SgiStr (x, n, sgn), loc)]
adamc@123 1668 | L'.DFfiStr (x, n, sgn) => [(L'.SgiStr (x, n, sgn), loc)]
adamc@123 1669 | L'.DConstraint cs => [(L'.SgiConstraint cs, loc)]
adamc@123 1670 | L'.DExport _ => []
adamc@88 1671
adamc@88 1672 fun sgiBindsD (env, denv) (sgi, _) =
adamc@88 1673 case sgi of
adamc@90 1674 L'.SgiConstraint (c1, c2) =>
adamc@90 1675 (case D.assert env denv (c1, c2) of
adamc@90 1676 (denv, []) => denv
adamc@90 1677 | _ => raise Fail "sgiBindsD: Sub-constraints remain")
adamc@88 1678 | _ => denv
adamc@31 1679
adamc@86 1680 fun subSgn (env, denv) sgn1 (sgn2 as (_, loc2)) =
adamc@35 1681 case (#1 (hnormSgn env sgn1), #1 (hnormSgn env sgn2)) of
adamc@31 1682 (L'.SgnError, _) => ()
adamc@31 1683 | (_, L'.SgnError) => ()
adamc@31 1684
adamc@31 1685 | (L'.SgnConst sgis1, L'.SgnConst sgis2) =>
adamc@31 1686 let
adamc@156 1687 fun folder (sgi2All as (sgi, loc), (env, denv)) =
adamc@31 1688 let
adamc@31 1689 fun seek p =
adamc@31 1690 let
adamc@88 1691 fun seek (env, denv) ls =
adamc@31 1692 case ls of
adamc@31 1693 [] => (sgnError env (UnmatchedSgi sgi2All);
adamc@88 1694 (env, denv))
adamc@31 1695 | h :: t =>
adamc@31 1696 case p h of
adamc@88 1697 NONE => seek (E.sgiBinds env h, sgiBindsD (env, denv) h) t
adamc@88 1698 | SOME envs => envs
adamc@31 1699 in
adamc@88 1700 seek (env, denv) sgis1
adamc@31 1701 end
adamc@31 1702 in
adamc@31 1703 case sgi of
adamc@31 1704 L'.SgiConAbs (x, n2, k2) =>
adamc@31 1705 seek (fn sgi1All as (sgi1, _) =>
adamc@31 1706 let
adamc@41 1707 fun found (x', n1, k1, co1) =
adamc@41 1708 if x = x' then
adamc@41 1709 let
adamc@41 1710 val () = unifyKinds k1 k2
adamc@41 1711 handle KUnify (k1, k2, err) =>
adamc@41 1712 sgnError env (SgiWrongKind (sgi1All, k1, sgi2All, k2, err))
adamc@41 1713 val env = E.pushCNamedAs env x n1 k1 co1
adamc@41 1714 in
adamc@41 1715 SOME (if n1 = n2 then
adamc@41 1716 env
adamc@41 1717 else
adamc@88 1718 E.pushCNamedAs env x n2 k2 (SOME (L'.CNamed n1, loc2)),
adamc@88 1719 denv)
adamc@41 1720 end
adamc@41 1721 else
adamc@41 1722 NONE
adamc@31 1723 in
adamc@31 1724 case sgi1 of
adamc@41 1725 L'.SgiConAbs (x', n1, k1) => found (x', n1, k1, NONE)
adamc@41 1726 | L'.SgiCon (x', n1, k1, c1) => found (x', n1, k1, SOME c1)
adamc@159 1727 | L'.SgiDatatype (x', n1, _) => found (x', n1, (L'.KType, loc), NONE)
adamc@159 1728 | L'.SgiDatatypeImp (x', n1, m1, ms, s) =>
adamc@159 1729 found (x', n1, (L'.KType, loc), SOME (L'.CModProj (m1, ms, s), loc))
adamc@31 1730 | _ => NONE
adamc@31 1731 end)
adamc@31 1732
adamc@31 1733 | L'.SgiCon (x, n2, k2, c2) =>
adamc@31 1734 seek (fn sgi1All as (sgi1, _) =>
adamc@31 1735 case sgi1 of
adamc@41 1736 L'.SgiCon (x', n1, k1, c1) =>
adamc@41 1737 if x = x' then
adamc@41 1738 let
adamc@88 1739 fun good () = SOME (E.pushCNamedAs env x n2 k2 (SOME c2), denv)
adamc@41 1740 in
adamc@86 1741 (case unifyCons (env, denv) c1 c2 of
adamc@86 1742 [] => good ()
adamc@86 1743 | _ => NONE)
adamc@86 1744 handle CUnify (c1, c2, err) =>
adamc@86 1745 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@86 1746 good ())
adamc@41 1747 end
adamc@41 1748 else
adamc@41 1749 NONE
adamc@31 1750 | _ => NONE)
adamc@31 1751
adamc@156 1752 | L'.SgiDatatype (x, n2, xncs2) =>
adamc@156 1753 seek (fn sgi1All as (sgi1, _) =>
adamc@156 1754 case sgi1 of
adamc@156 1755 L'.SgiDatatype (x', n1, xncs1) =>
adamc@156 1756 let
adamc@156 1757 fun mismatched ue =
adamc@156 1758 (sgnError env (SgiMismatchedDatatypes (sgi1All, sgi2All, ue));
adamc@156 1759 SOME (env, denv))
adamc@156 1760
adamc@156 1761 fun good () =
adamc@156 1762 let
adamc@156 1763 val env = E.sgiBinds env sgi2All
adamc@156 1764 val env = if n1 = n2 then
adamc@156 1765 env
adamc@156 1766 else
adamc@156 1767 E.pushCNamedAs env x n1 (L'.KType, loc)
adamc@156 1768 (SOME (L'.CNamed n1, loc))
adamc@156 1769 in
adamc@156 1770 SOME (env, denv)
adamc@156 1771 end
adamc@156 1772
adamc@156 1773 fun xncBad ((x1, _, t1), (x2, _, t2)) =
adamc@156 1774 String.compare (x1, x2) <> EQUAL
adamc@156 1775 orelse case (t1, t2) of
adamc@156 1776 (NONE, NONE) => false
adamc@156 1777 | (SOME t1, SOME t2) =>
adamc@156 1778 not (List.null (unifyCons (env, denv) t1 t2))
adamc@156 1779 | _ => true
adamc@156 1780 in
adamc@156 1781 (if x = x' then
adamc@156 1782 if length xncs1 <> length xncs2
adamc@156 1783 orelse ListPair.exists xncBad (xncs1, xncs2) then
adamc@156 1784 mismatched NONE
adamc@156 1785 else
adamc@156 1786 good ()
adamc@156 1787 else
adamc@156 1788 NONE)
adamc@156 1789 handle CUnify ue => mismatched (SOME ue)
adamc@156 1790 end
adamc@156 1791 | _ => NONE)
adamc@156 1792
adamc@158 1793 | L'.SgiDatatypeImp (x, n2, m11, ms1, s1) =>
adamc@158 1794 seek (fn sgi1All as (sgi1, _) =>
adamc@158 1795 case sgi1 of
adamc@158 1796 L'.SgiDatatypeImp (x', n1, m12, ms2, s2) =>
adamc@158 1797 if x = x' then
adamc@158 1798 let
adamc@158 1799 val k = (L'.KType, loc)
adamc@158 1800 val t1 = (L'.CModProj (m11, ms1, s1), loc)
adamc@158 1801 val t2 = (L'.CModProj (m12, ms2, s2), loc)
adamc@158 1802
adamc@158 1803 fun good () =
adamc@158 1804 let
adamc@158 1805 val env = E.pushCNamedAs env x n1 k (SOME t1)
adamc@158 1806 val env = E.pushCNamedAs env x n2 k (SOME t2)
adamc@158 1807 in
adamc@158 1808 SOME (env, denv)
adamc@158 1809 end
adamc@158 1810 in
adamc@158 1811 (case unifyCons (env, denv) t1 t2 of
adamc@158 1812 [] => good ()
adamc@158 1813 | _ => NONE)
adamc@158 1814 handle CUnify (c1, c2, err) =>
adamc@158 1815 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@158 1816 good ())
adamc@158 1817 end
adamc@158 1818 else
adamc@158 1819 NONE
adamc@158 1820
adamc@158 1821 | _ => NONE)
adamc@156 1822
adamc@32 1823 | L'.SgiVal (x, n2, c2) =>
adamc@32 1824 seek (fn sgi1All as (sgi1, _) =>
adamc@32 1825 case sgi1 of
adamc@41 1826 L'.SgiVal (x', n1, c1) =>
adamc@41 1827 if x = x' then
adamc@86 1828 (case unifyCons (env, denv) c1 c2 of
adamc@88 1829 [] => SOME (env, denv)
adamc@86 1830 | _ => NONE)
adamc@86 1831 handle CUnify (c1, c2, err) =>
adamc@86 1832 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@88 1833 SOME (env, denv))
adamc@41 1834 else
adamc@41 1835 NONE
adamc@32 1836 | _ => NONE)
adamc@32 1837
adamc@33 1838 | L'.SgiStr (x, n2, sgn2) =>
adamc@33 1839 seek (fn sgi1All as (sgi1, _) =>
adamc@33 1840 case sgi1 of
adamc@41 1841 L'.SgiStr (x', n1, sgn1) =>
adamc@41 1842 if x = x' then
adamc@66 1843 let
adamc@86 1844 val () = subSgn (env, denv) sgn1 sgn2
adamc@66 1845 val env = E.pushStrNamedAs env x n1 sgn1
adamc@66 1846 val env = if n1 = n2 then
adamc@66 1847 env
adamc@66 1848 else
adamc@66 1849 E.pushStrNamedAs env x n2
adamc@66 1850 (selfifyAt env {str = (L'.StrVar n1, #2 sgn2),
adamc@66 1851 sgn = sgn2})
adamc@66 1852 in
adamc@88 1853 SOME (env, denv)
adamc@66 1854 end
adamc@41 1855 else
adamc@41 1856 NONE
adamc@33 1857 | _ => NONE)
adamc@59 1858
adamc@59 1859 | L'.SgiSgn (x, n2, sgn2) =>
adamc@59 1860 seek (fn sgi1All as (sgi1, _) =>
adamc@59 1861 case sgi1 of
adamc@59 1862 L'.SgiSgn (x', n1, sgn1) =>
adamc@59 1863 if x = x' then
adamc@65 1864 let
adamc@86 1865 val () = subSgn (env, denv) sgn1 sgn2
adamc@86 1866 val () = subSgn (env, denv) sgn2 sgn1
adamc@65 1867
adamc@65 1868 val env = E.pushSgnNamedAs env x n2 sgn2
adamc@65 1869 val env = if n1 = n2 then
adamc@65 1870 env
adamc@65 1871 else
adamc@65 1872 E.pushSgnNamedAs env x n1 sgn2
adamc@65 1873 in
adamc@88 1874 SOME (env, denv)
adamc@65 1875 end
adamc@59 1876 else
adamc@59 1877 NONE
adamc@59 1878 | _ => NONE)
adamc@88 1879
adamc@88 1880 | L'.SgiConstraint (c2, d2) =>
adamc@88 1881 seek (fn sgi1All as (sgi1, _) =>
adamc@88 1882 case sgi1 of
adamc@88 1883 L'.SgiConstraint (c1, d1) =>
adamc@88 1884 if consEq (env, denv) (c1, c2) andalso consEq (env, denv) (d1, d2) then
adamc@90 1885 let
adamc@90 1886 val (denv, gs) = D.assert env denv (c2, d2)
adamc@90 1887 in
adamc@90 1888 case gs of
adamc@90 1889 [] => ()
adamc@90 1890 | _ => raise Fail "subSgn: Sub-constraints remain";
adamc@90 1891
adamc@90 1892 SOME (env, denv)
adamc@90 1893 end
adamc@88 1894 else
adamc@88 1895 NONE
adamc@88 1896 | _ => NONE)
adamc@31 1897 end
adamc@31 1898 in
adamc@88 1899 ignore (foldl folder (env, denv) sgis2)
adamc@31 1900 end
adamc@31 1901
adamc@41 1902 | (L'.SgnFun (m1, n1, dom1, ran1), L'.SgnFun (m2, n2, dom2, ran2)) =>
adamc@43 1903 let
adamc@43 1904 val ran1 =
adamc@43 1905 if n1 = n2 then
adamc@43 1906 ran1
adamc@43 1907 else
adamc@43 1908 subStrInSgn (n1, n2) ran1
adamc@43 1909 in
adamc@86 1910 subSgn (env, denv) dom2 dom1;
adamc@86 1911 subSgn (E.pushStrNamedAs env m2 n2 dom2, denv) ran1 ran2
adamc@43 1912 end
adamc@41 1913
adamc@41 1914 | _ => sgnError env (SgnWrongForm (sgn1, sgn2))
adamc@41 1915
adamc@61 1916
adamc@88 1917 fun elabDecl ((d, loc), (env, denv, gs)) =
adamc@76 1918 case d of
adamc@76 1919 L.DCon (x, ko, c) =>
adamc@76 1920 let
adamc@76 1921 val k' = case ko of
adamc@76 1922 NONE => kunif loc
adamc@76 1923 | SOME k => elabKind k
adamc@76 1924
adamc@83 1925 val (c', ck, gs') = elabCon (env, denv) c
adamc@76 1926 val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@76 1927 in
adamc@76 1928 checkKind env c' ck k';
adamc@76 1929
adamc@88 1930 ([(L'.DCon (x, n, k', c'), loc)], (env', denv, gs' @ gs))
adamc@76 1931 end
adamc@156 1932 | L.DDatatype (x, xcs) =>
adamc@156 1933 let
adamc@156 1934 val k = (L'.KType, loc)
adamc@156 1935 val (env, n) = E.pushCNamed env x k NONE
adamc@156 1936 val t = (L'.CNamed n, loc)
adamc@156 1937
adamc@156 1938 val (xcs, (used, env, gs)) =
adamc@156 1939 ListUtil.foldlMap
adamc@156 1940 (fn ((x, to), (used, env, gs)) =>
adamc@156 1941 let
adamc@156 1942 val (to, t, gs') = case to of
adamc@156 1943 NONE => (NONE, t, gs)
adamc@156 1944 | SOME t' =>
adamc@156 1945 let
adamc@156 1946 val (t', tk, gs') = elabCon (env, denv) t'
adamc@156 1947 in
adamc@156 1948 checkKind env t' tk k;
adamc@156 1949 (SOME t', (L'.TFun (t', t), loc), gs' @ gs)
adamc@156 1950 end
adamc@156 1951
adamc@156 1952 val (env, n') = E.pushENamed env x t
adamc@156 1953 in
adamc@156 1954 if SS.member (used, x) then
adamc@156 1955 strError env (DuplicateConstructor (x, loc))
adamc@156 1956 else
adamc@156 1957 ();
adamc@156 1958 ((x, n', to), (SS.add (used, x), env, gs'))
adamc@156 1959 end)
adamc@156 1960 (SS.empty, env, []) xcs
adamc@156 1961 in
adamc@156 1962 ([(L'.DDatatype (x, n, xcs), loc)], (env, denv, gs))
adamc@156 1963 end
adamc@156 1964
adamc@157 1965 | L.DDatatypeImp (_, [], _) => raise Fail "Empty DDatatypeImp"
adamc@157 1966
adamc@157 1967 | L.DDatatypeImp (x, m1 :: ms, s) =>
adamc@157 1968 (case E.lookupStr env m1 of
adamc@157 1969 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@157 1970 ([], (env, denv, gs)))
adamc@157 1971 | SOME (n, sgn) =>
adamc@157 1972 let
adamc@157 1973 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@157 1974 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@157 1975 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@157 1976 (strerror, sgnerror))
adamc@157 1977 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@157 1978 ((L'.StrVar n, loc), sgn) ms
adamc@157 1979 in
adamc@158 1980 case hnormCon (env, denv) (L'.CModProj (n, ms, s), loc) of
adamc@158 1981 ((L'.CModProj (n, ms, s), _), gs) =>
adamc@158 1982 (case E.projectDatatype env {sgn = sgn, str = str, field = s} of
adamc@158 1983 NONE => (conError env (UnboundDatatype (loc, s));
adamc@158 1984 ([], (env, denv, gs)))
adamc@158 1985 | SOME xncs =>
adamc@158 1986 let
adamc@158 1987 val k = (L'.KType, loc)
adamc@158 1988 val t = (L'.CModProj (n, ms, s), loc)
adamc@158 1989 val (env, n') = E.pushCNamed env x k (SOME t)
adamc@158 1990 val env = E.pushDatatype env n' xncs
adamc@157 1991
adamc@158 1992 val t = (L'.CNamed n', loc)
adamc@158 1993 val env = foldl (fn ((x, n, to), env) =>
adamc@158 1994 let
adamc@158 1995 val t = case to of
adamc@158 1996 NONE => t
adamc@158 1997 | SOME t' => (L'.TFun (t', t), loc)
adamc@158 1998 in
adamc@158 1999 E.pushENamedAs env x n t
adamc@158 2000 end) env xncs
adamc@158 2001 in
adamc@158 2002 ([(L'.DDatatypeImp (x, n', n, ms, s), loc)], (env, denv, gs))
adamc@158 2003 end)
adamc@158 2004 | _ => (strError env (NotDatatype loc);
adamc@158 2005 ([], (env, denv, [])))
adamc@157 2006 end)
adamc@157 2007
adamc@76 2008 | L.DVal (x, co, e) =>
adamc@76 2009 let
adamc@123 2010 val (c', _, gs1) = case co of
adamc@83 2011 NONE => (cunif (loc, ktype), ktype, [])
adamc@83 2012 | SOME c => elabCon (env, denv) c
adamc@76 2013
adamc@83 2014 val (e', et, gs2) = elabExp (env, denv) e
adamc@76 2015 val (env', n) = E.pushENamed env x c'
adamc@86 2016
adamc@86 2017 val gs3 = checkCon (env, denv) e' et c'
adamc@76 2018 in
adamc@88 2019 ([(L'.DVal (x, n, c', e'), loc)], (env', denv, gs1 @ gs2 @ gs3 @ gs))
adamc@76 2020 end
adamc@123 2021 | L.DValRec vis =>
adamc@123 2022 let
adamc@123 2023 val (vis, gs) = ListUtil.foldlMap
adamc@123 2024 (fn ((x, co, e), gs) =>
adamc@123 2025 let
adamc@123 2026 val (c', _, gs1) = case co of
adamc@123 2027 NONE => (cunif (loc, ktype), ktype, [])
adamc@123 2028 | SOME c => elabCon (env, denv) c
adamc@123 2029 in
adamc@123 2030 ((x, c', e), gs1 @ gs)
adamc@123 2031 end) [] vis
adamc@123 2032
adamc@123 2033 val (vis, env) = ListUtil.foldlMap (fn ((x, c', e), env) =>
adamc@123 2034 let
adamc@123 2035 val (env, n) = E.pushENamed env x c'
adamc@123 2036 in
adamc@123 2037 ((x, n, c', e), env)
adamc@123 2038 end) env vis
adamc@123 2039
adamc@123 2040 val (vis, gs) = ListUtil.foldlMap (fn ((x, n, c', e), gs) =>
adamc@123 2041 let
adamc@123 2042 val (e', et, gs1) = elabExp (env, denv) e
adamc@123 2043
adamc@123 2044 val gs2 = checkCon (env, denv) e' et c'
adamc@123 2045 in
adamc@123 2046 ((x, n, c', e'), gs1 @ gs2 @ gs)
adamc@123 2047 end) gs vis
adamc@123 2048 in
adamc@123 2049 ([(L'.DValRec vis, loc)], (env, denv, gs))
adamc@123 2050 end
adamc@76 2051
adamc@76 2052 | L.DSgn (x, sgn) =>
adamc@76 2053 let
adamc@83 2054 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2055 val (env', n) = E.pushSgnNamed env x sgn'
adamc@76 2056 in
adamc@88 2057 ([(L'.DSgn (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 2058 end
adamc@76 2059
adamc@76 2060 | L.DStr (x, sgno, str) =>
adamc@76 2061 let
adamc@93 2062 val () = if x = "Basis" then
adamc@93 2063 raise Fail "Not allowed to redefine structure 'Basis'"
adamc@93 2064 else
adamc@93 2065 ()
adamc@93 2066
adamc@83 2067 val formal = Option.map (elabSgn (env, denv)) sgno
adamc@76 2068
adamc@83 2069 val (str', sgn', gs') =
adamc@78 2070 case formal of
adamc@78 2071 NONE =>
adamc@78 2072 let
adamc@83 2073 val (str', actual, ds) = elabStr (env, denv) str
adamc@78 2074 in
adamc@83 2075 (str', selfifyAt env {str = str', sgn = actual}, ds)
adamc@78 2076 end
adamc@83 2077 | SOME (formal, gs1) =>
adamc@78 2078 let
adamc@78 2079 val str =
adamc@78 2080 case #1 (hnormSgn env formal) of
adamc@78 2081 L'.SgnConst sgis =>
adamc@78 2082 (case #1 str of
adamc@78 2083 L.StrConst ds =>
adamc@78 2084 let
adamc@78 2085 val needed = foldl (fn ((sgi, _), needed) =>
adamc@78 2086 case sgi of
adamc@78 2087 L'.SgiConAbs (x, _, _) => SS.add (needed, x)
adamc@78 2088 | _ => needed)
adamc@78 2089 SS.empty sgis
adamc@78 2090
adamc@78 2091 val needed = foldl (fn ((d, _), needed) =>
adamc@78 2092 case d of
adamc@78 2093 L.DCon (x, _, _) => (SS.delete (needed, x)
adamc@78 2094 handle NotFound => needed)
adamc@78 2095 | L.DOpen _ => SS.empty
adamc@78 2096 | _ => needed)
adamc@78 2097 needed ds
adamc@78 2098 in
adamc@78 2099 case SS.listItems needed of
adamc@78 2100 [] => str
adamc@78 2101 | xs =>
adamc@78 2102 let
adamc@78 2103 val kwild = (L.KWild, #2 str)
adamc@78 2104 val cwild = (L.CWild kwild, #2 str)
adamc@78 2105 val ds' = map (fn x => (L.DCon (x, NONE, cwild), #2 str)) xs
adamc@78 2106 in
adamc@78 2107 (L.StrConst (ds @ ds'), #2 str)
adamc@78 2108 end
adamc@78 2109 end
adamc@78 2110 | _ => str)
adamc@78 2111 | _ => str
adamc@78 2112
adamc@83 2113 val (str', actual, gs2) = elabStr (env, denv) str
adamc@78 2114 in
adamc@158 2115 subSgn (env, denv) (selfifyAt env {str = str', sgn = actual}) formal;
adamc@83 2116 (str', formal, gs1 @ gs2)
adamc@78 2117 end
adamc@76 2118
adamc@76 2119 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 2120 in
adamc@76 2121 case #1 (hnormSgn env sgn') of
adamc@76 2122 L'.SgnFun _ =>
adamc@76 2123 (case #1 str' of
adamc@76 2124 L'.StrFun _ => ()
adamc@76 2125 | _ => strError env (FunctorRebind loc))
adamc@76 2126 | _ => ();
adamc@76 2127
adamc@88 2128 ([(L'.DStr (x, n, sgn', str'), loc)], (env', denv, gs' @ gs))
adamc@76 2129 end
adamc@76 2130
adamc@76 2131 | L.DFfiStr (x, sgn) =>
adamc@76 2132 let
adamc@83 2133 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2134
adamc@76 2135 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 2136 in
adamc@88 2137 ([(L'.DFfiStr (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 2138 end
adamc@76 2139
adamc@76 2140 | L.DOpen (m, ms) =>
adamc@88 2141 (case E.lookupStr env m of
adamc@88 2142 NONE => (strError env (UnboundStr (loc, m));
adamc@88 2143 ([], (env, denv, [])))
adamc@88 2144 | SOME (n, sgn) =>
adamc@88 2145 let
adamc@88 2146 val (_, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@88 2147 case E.projectStr env {str = str, sgn = sgn, field = m} of
adamc@88 2148 NONE => (strError env (UnboundStr (loc, m));
adamc@88 2149 (strerror, sgnerror))
adamc@88 2150 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@88 2151 ((L'.StrVar n, loc), sgn) ms
adamc@83 2152
adamc@88 2153 val (ds, (env', denv')) = dopen (env, denv) {str = n, strs = ms, sgn = sgn}
adamc@88 2154 val denv' = dopenConstraints (loc, env', denv') {str = m, strs = ms}
adamc@88 2155 in
adamc@88 2156 (ds, (env', denv', []))
adamc@88 2157 end)
adamc@88 2158
adamc@88 2159 | L.DConstraint (c1, c2) =>
adamc@88 2160 let
adamc@88 2161 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@88 2162 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@90 2163 val gs3 = D.prove env denv (c1', c2', loc)
adamc@88 2164
adamc@90 2165 val (denv', gs4) = D.assert env denv (c1', c2')
adamc@88 2166 in
adamc@88 2167 checkKind env c1' k1 (L'.KRecord (kunif loc), loc);
adamc@88 2168 checkKind env c2' k2 (L'.KRecord (kunif loc), loc);
adamc@88 2169
adamc@90 2170 ([(L'.DConstraint (c1', c2'), loc)], (env, denv', gs1 @ gs2 @ gs3 @ gs4))
adamc@88 2171 end
adamc@88 2172
adamc@88 2173 | L.DOpenConstraints (m, ms) =>
adamc@88 2174 let
adamc@88 2175 val denv = dopenConstraints (loc, env, denv) {str = m, strs = ms}
adamc@88 2176 in
adamc@88 2177 ([], (env, denv, []))
adamc@88 2178 end
adamc@3 2179
adamc@109 2180 | L.DExport str =>
adamc@100 2181 let
adamc@109 2182 val (str', sgn, gs) = elabStr (env, denv) str
adamc@100 2183
adamc@109 2184 val sgn =
adamc@109 2185 case #1 (hnormSgn env sgn) of
adamc@109 2186 L'.SgnConst sgis =>
adamc@109 2187 let
adamc@146 2188 fun doOne (all as (sgi, _), env) =
adamc@146 2189 (case sgi of
adamc@146 2190 L'.SgiVal (x, n, t) =>
adamc@146 2191 (case hnormCon (env, denv) t of
adamc@146 2192 ((L'.TFun (dom, ran), _), []) =>
adamc@146 2193 (case (hnormCon (env, denv) dom, hnormCon (env, denv) ran) of
adamc@146 2194 (((L'.TRecord domR, _), []),
adamc@146 2195 ((L'.CApp (tf, arg3), _), [])) =>
adamc@146 2196 (case (hnormCon (env, denv) tf, hnormCon (env, denv) arg3) of
adamc@146 2197 (((L'.CApp (tf, arg2), _), []),
adamc@146 2198 (((L'.CRecord (_, []), _), []))) =>
adamc@146 2199 (case (hnormCon (env, denv) tf) of
adamc@146 2200 ((L'.CApp (tf, arg1), _), []) =>
adamc@146 2201 (case (hnormCon (env, denv) tf,
adamc@146 2202 hnormCon (env, denv) domR,
adamc@152 2203 hnormCon (env, denv) arg1,
adamc@146 2204 hnormCon (env, denv) arg2) of
adamc@152 2205 ((tf, []), (domR, []), (arg1, []),
adamc@146 2206 ((L'.CRecord (_, []), _), [])) =>
adamc@146 2207 let
adamc@146 2208 val t = (L'.CApp (tf, arg1), loc)
adamc@146 2209 val t = (L'.CApp (t, arg2), loc)
adamc@146 2210 val t = (L'.CApp (t, arg3), loc)
adamc@146 2211 in
adamc@146 2212 (L'.SgiVal (x, n, (L'.TFun ((L'.TRecord domR, loc),
adamc@146 2213 t),
adamc@146 2214 loc)), loc)
adamc@146 2215 end
adamc@146 2216 | _ => all)
adamc@146 2217 | _ => all)
adamc@146 2218 | _ => all)
adamc@146 2219 | _ => all)
adamc@146 2220 | _ => all)
adamc@146 2221 | _ => all,
adamc@146 2222 E.sgiBinds env all)
adamc@109 2223 in
adamc@146 2224 (L'.SgnConst (#1 (ListUtil.foldlMap doOne env sgis)), loc)
adamc@109 2225 end
adamc@109 2226 | _ => sgn
adamc@100 2227 in
adamc@109 2228 ([(L'.DExport (E.newNamed (), sgn, str'), loc)], (env, denv, gs))
adamc@100 2229 end
adamc@100 2230
adamc@83 2231 and elabStr (env, denv) (str, loc) =
adamc@31 2232 case str of
adamc@31 2233 L.StrConst ds =>
adamc@31 2234 let
adamc@88 2235 val (ds', (_, _, gs)) = ListUtil.foldlMapConcat elabDecl (env, denv, []) ds
adamc@123 2236 val sgis = ListUtil.mapConcat sgiOfDecl ds'
adamc@63 2237
adamc@63 2238 val (sgis, _, _, _, _) =
adamc@64 2239 foldr (fn ((sgi, loc), (sgis, cons, vals, sgns, strs)) =>
adamc@63 2240 case sgi of
adamc@64 2241 L'.SgiConAbs (x, n, k) =>
adamc@64 2242 let
adamc@64 2243 val (cons, x) =
adamc@64 2244 if SS.member (cons, x) then
adamc@64 2245 (cons, "?" ^ x)
adamc@64 2246 else
adamc@64 2247 (SS.add (cons, x), x)
adamc@64 2248 in
adamc@64 2249 ((L'.SgiConAbs (x, n, k), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 2250 end
adamc@64 2251 | L'.SgiCon (x, n, k, c) =>
adamc@64 2252 let
adamc@64 2253 val (cons, x) =
adamc@64 2254 if SS.member (cons, x) then
adamc@64 2255 (cons, "?" ^ x)
adamc@64 2256 else
adamc@64 2257 (SS.add (cons, x), x)
adamc@64 2258 in
adamc@64 2259 ((L'.SgiCon (x, n, k, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 2260 end
adamc@156 2261 | L'.SgiDatatype (x, n, xncs) =>
adamc@156 2262 let
adamc@156 2263 val (cons, x) =
adamc@156 2264 if SS.member (cons, x) then
adamc@156 2265 (cons, "?" ^ x)
adamc@156 2266 else
adamc@156 2267 (SS.add (cons, x), x)
adamc@156 2268
adamc@156 2269 val (xncs, vals) =
adamc@156 2270 ListUtil.foldlMap
adamc@156 2271 (fn ((x, n, t), vals) =>
adamc@156 2272 if SS.member (vals, x) then
adamc@156 2273 (("?" ^ x, n, t), vals)
adamc@156 2274 else
adamc@156 2275 ((x, n, t), SS.add (vals, x)))
adamc@156 2276 vals xncs
adamc@156 2277 in
adamc@156 2278 ((L'.SgiDatatype (x, n, xncs), loc) :: sgis, cons, vals, sgns, strs)
adamc@156 2279 end
adamc@156 2280 | L'.SgiDatatypeImp (x, n, m1, ms, x') =>
adamc@156 2281 let
adamc@156 2282 val (cons, x) =
adamc@156 2283 if SS.member (cons, x) then
adamc@156 2284 (cons, "?" ^ x)
adamc@156 2285 else
adamc@156 2286 (SS.add (cons, x), x)
adamc@156 2287 in
adamc@156 2288 ((L'.SgiDatatypeImp (x, n, m1, ms, x'), loc) :: sgis, cons, vals, sgns, strs)
adamc@156 2289 end
adamc@64 2290 | L'.SgiVal (x, n, c) =>
adamc@64 2291 let
adamc@64 2292 val (vals, x) =
adamc@64 2293 if SS.member (vals, x) then
adamc@64 2294 (vals, "?" ^ x)
adamc@64 2295 else
adamc@64 2296 (SS.add (vals, x), x)
adamc@64 2297 in
adamc@64 2298 ((L'.SgiVal (x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 2299 end
adamc@64 2300 | L'.SgiSgn (x, n, sgn) =>
adamc@64 2301 let
adamc@64 2302 val (sgns, x) =
adamc@64 2303 if SS.member (sgns, x) then
adamc@64 2304 (sgns, "?" ^ x)
adamc@64 2305 else
adamc@64 2306 (SS.add (sgns, x), x)
adamc@64 2307 in
adamc@64 2308 ((L'.SgiSgn (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 2309 end
adamc@64 2310
adamc@64 2311 | L'.SgiStr (x, n, sgn) =>
adamc@64 2312 let
adamc@64 2313 val (strs, x) =
adamc@64 2314 if SS.member (strs, x) then
adamc@64 2315 (strs, "?" ^ x)
adamc@64 2316 else
adamc@64 2317 (SS.add (strs, x), x)
adamc@64 2318 in
adamc@64 2319 ((L'.SgiStr (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@88 2320 end
adamc@88 2321 | L'.SgiConstraint _ => ((sgi, loc) :: sgis, cons, vals, sgns, strs))
adamc@64 2322
adamc@63 2323 ([], SS.empty, SS.empty, SS.empty, SS.empty) sgis
adamc@31 2324 in
adamc@83 2325 ((L'.StrConst ds', loc), (L'.SgnConst sgis, loc), gs)
adamc@31 2326 end
adamc@31 2327 | L.StrVar x =>
adamc@31 2328 (case E.lookupStr env x of
adamc@31 2329 NONE =>
adamc@31 2330 (strError env (UnboundStr (loc, x));
adamc@83 2331 (strerror, sgnerror, []))
adamc@83 2332 | SOME (n, sgn) => ((L'.StrVar n, loc), sgn, []))
adamc@34 2333 | L.StrProj (str, x) =>
adamc@34 2334 let
adamc@83 2335 val (str', sgn, gs) = elabStr (env, denv) str
adamc@34 2336 in
adamc@34 2337 case E.projectStr env {str = str', sgn = sgn, field = x} of
adamc@34 2338 NONE => (strError env (UnboundStr (loc, x));
adamc@83 2339 (strerror, sgnerror, []))
adamc@83 2340 | SOME sgn => ((L'.StrProj (str', x), loc), sgn, gs)
adamc@34 2341 end
adamc@41 2342 | L.StrFun (m, dom, ranO, str) =>
adamc@41 2343 let
adamc@83 2344 val (dom', gs1) = elabSgn (env, denv) dom
adamc@41 2345 val (env', n) = E.pushStrNamed env m dom'
adamc@83 2346 val (str', actual, gs2) = elabStr (env', denv) str
adamc@41 2347
adamc@83 2348 val (formal, gs3) =
adamc@41 2349 case ranO of
adamc@83 2350 NONE => (actual, [])
adamc@41 2351 | SOME ran =>
adamc@41 2352 let
adamc@83 2353 val (ran', gs) = elabSgn (env', denv) ran
adamc@41 2354 in
adamc@86 2355 subSgn (env', denv) actual ran';
adamc@83 2356 (ran', gs)
adamc@41 2357 end
adamc@41 2358 in
adamc@41 2359 ((L'.StrFun (m, n, dom', formal, str'), loc),
adamc@83 2360 (L'.SgnFun (m, n, dom', formal), loc),
adamc@83 2361 gs1 @ gs2 @ gs3)
adamc@41 2362 end
adamc@44 2363 | L.StrApp (str1, str2) =>
adamc@44 2364 let
adamc@83 2365 val (str1', sgn1, gs1) = elabStr (env, denv) str1
adamc@83 2366 val (str2', sgn2, gs2) = elabStr (env, denv) str2
adamc@44 2367 in
adamc@44 2368 case #1 (hnormSgn env sgn1) of
adamc@83 2369 L'.SgnError => (strerror, sgnerror, [])
adamc@44 2370 | L'.SgnFun (m, n, dom, ran) =>
adamc@86 2371 (subSgn (env, denv) sgn2 dom;
adamc@44 2372 case #1 (hnormSgn env ran) of
adamc@83 2373 L'.SgnError => (strerror, sgnerror, [])
adamc@44 2374 | L'.SgnConst sgis =>
adamc@44 2375 ((L'.StrApp (str1', str2'), loc),
adamc@83 2376 (L'.SgnConst ((L'.SgiStr (m, n, selfifyAt env {str = str2', sgn = sgn2}), loc) :: sgis), loc),
adamc@83 2377 gs1 @ gs2)
adamc@44 2378 | _ => raise Fail "Unable to hnormSgn in functor application")
adamc@44 2379 | _ => (strError env (NotFunctor sgn1);
adamc@83 2380 (strerror, sgnerror, []))
adamc@44 2381 end
adamc@31 2382
adamc@56 2383 fun elabFile basis env file =
adamc@56 2384 let
adamc@83 2385 val (sgn, gs) = elabSgn (env, D.empty) (L.SgnConst basis, ErrorMsg.dummySpan)
adamc@83 2386 val () = case gs of
adamc@83 2387 [] => ()
adamc@83 2388 | _ => raise Fail "Unresolved disjointness constraints in Basis"
adamc@83 2389
adamc@56 2390 val (env', basis_n) = E.pushStrNamed env "Basis" sgn
adamc@56 2391
adamc@88 2392 val (ds, (env', _)) = dopen (env', D.empty) {str = basis_n, strs = [], sgn = sgn}
adamc@56 2393
adamc@56 2394 fun discoverC r x =
adamc@56 2395 case E.lookupC env' x of
adamc@56 2396 E.NotBound => raise Fail ("Constructor " ^ x ^ " unbound in Basis")
adamc@56 2397 | E.Rel _ => raise Fail ("Constructor " ^ x ^ " bound relatively in Basis")
adamc@56 2398 | E.Named (n, (_, loc)) => r := (L'.CNamed n, loc)
adamc@56 2399
adamc@56 2400 val () = discoverC int "int"
adamc@56 2401 val () = discoverC float "float"
adamc@56 2402 val () = discoverC string "string"
adamc@56 2403
adamc@83 2404 fun elabDecl' (d, (env, gs)) =
adamc@76 2405 let
adamc@76 2406 val () = resetKunif ()
adamc@76 2407 val () = resetCunif ()
adamc@88 2408 val (ds, (env, _, gs)) = elabDecl (d, (env, D.empty, gs))
adamc@76 2409 in
adamc@76 2410 if ErrorMsg.anyErrors () then
adamc@76 2411 ()
adamc@76 2412 else (
adamc@76 2413 if List.exists kunifsInDecl ds then
adamc@91 2414 declError env (KunifsRemain ds)
adamc@76 2415 else
adamc@76 2416 ();
adamc@76 2417
adamc@76 2418 case ListUtil.search cunifsInDecl ds of
adamc@76 2419 NONE => ()
adamc@76 2420 | SOME loc =>
adamc@91 2421 declError env (CunifsRemain ds)
adamc@76 2422 );
adamc@76 2423
adamc@83 2424 (ds, (env, gs))
adamc@76 2425 end
adamc@76 2426
adamc@83 2427 val (file, (_, gs)) = ListUtil.foldlMapConcat elabDecl' (env', []) file
adamc@56 2428 in
adamc@84 2429 if ErrorMsg.anyErrors () then
adamc@84 2430 ()
adamc@84 2431 else
adamc@90 2432 app (fn (loc, env, denv, c1, c2) =>
adamc@84 2433 case D.prove env denv (c1, c2, loc) of
adamc@84 2434 [] => ()
adamc@84 2435 | _ =>
adamc@86 2436 (ErrorMsg.errorAt loc "Couldn't prove field name disjointness";
adamc@84 2437 eprefaces' [("Con 1", p_con env c1),
adamc@90 2438 ("Con 2", p_con env c2),
adamc@90 2439 ("Hnormed 1", p_con env (ElabOps.hnormCon env c1)),
adamc@90 2440 ("Hnormed 2", p_con env (ElabOps.hnormCon env c2))])) gs;
adamc@83 2441
adamc@56 2442 (L'.DFfiStr ("Basis", basis_n, sgn), ErrorMsg.dummySpan) :: ds @ file
adamc@56 2443 end
adamc@2 2444
adamc@2 2445 end