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annotate src/elaborate.sml @ 243:2b9dfaffb008

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author Adam Chlipala <adamc@hcoop.net>
date Thu, 28 Aug 2008 14:48:33 -0400
parents 44a1663ad893
children b6b75e6e0898
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@172 40 structure IM = IntBinaryMap
adamc@175 41
adamc@175 42 structure SK = struct
adamc@175 43 type ord_key = string
adamc@175 44 val compare = String.compare
adamc@175 45 end
adamc@175 46
adamc@175 47 structure SS = BinarySetFn(SK)
adamc@175 48 structure SM = BinaryMapFn(SK)
adamc@62 49
adamc@210 50 val basis_r = ref 0
adamc@210 51
adamc@2 52 fun elabExplicitness e =
adamc@2 53 case e of
adamc@2 54 L.Explicit => L'.Explicit
adamc@2 55 | L.Implicit => L'.Implicit
adamc@2 56
adamc@2 57 fun occursKind r =
adamc@76 58 U.Kind.exists (fn L'.KUnif (_, _, r') => r = r'
adamc@2 59 | _ => false)
adamc@2 60
adamc@3 61 datatype kunify_error =
adamc@2 62 KOccursCheckFailed of L'.kind * L'.kind
adamc@2 63 | KIncompatible of L'.kind * L'.kind
adamc@2 64
adamc@3 65 exception KUnify' of kunify_error
adamc@3 66
adamc@3 67 fun kunifyError err =
adamc@2 68 case err of
adamc@2 69 KOccursCheckFailed (k1, k2) =>
adamc@3 70 eprefaces "Kind occurs check failed"
adamc@3 71 [("Kind 1", p_kind k1),
adamc@3 72 ("Kind 2", p_kind k2)]
adamc@2 73 | KIncompatible (k1, k2) =>
adamc@3 74 eprefaces "Incompatible kinds"
adamc@3 75 [("Kind 1", p_kind k1),
adamc@3 76 ("Kind 2", p_kind k2)]
adamc@2 77
adamc@3 78 fun unifyKinds' (k1All as (k1, _)) (k2All as (k2, _)) =
adamc@2 79 let
adamc@3 80 fun err f = raise KUnify' (f (k1All, k2All))
adamc@2 81 in
adamc@2 82 case (k1, k2) of
adamc@2 83 (L'.KType, L'.KType) => ()
adamc@82 84 | (L'.KUnit, L'.KUnit) => ()
adamc@82 85
adamc@2 86 | (L'.KArrow (d1, r1), L'.KArrow (d2, r2)) =>
adamc@3 87 (unifyKinds' d1 d2;
adamc@3 88 unifyKinds' r1 r2)
adamc@2 89 | (L'.KName, L'.KName) => ()
adamc@3 90 | (L'.KRecord k1, L'.KRecord k2) => unifyKinds' k1 k2
adamc@207 91 | (L'.KTuple ks1, L'.KTuple ks2) =>
adamc@207 92 ((ListPair.appEq (fn (k1, k2) => unifyKinds' k1 k2) (ks1, ks2))
adamc@207 93 handle ListPair.UnequalLengths => err KIncompatible)
adamc@2 94
adamc@2 95 | (L'.KError, _) => ()
adamc@2 96 | (_, L'.KError) => ()
adamc@2 97
adamc@76 98 | (L'.KUnif (_, _, ref (SOME k1All)), _) => unifyKinds' k1All k2All
adamc@76 99 | (_, L'.KUnif (_, _, ref (SOME k2All))) => unifyKinds' k1All k2All
adamc@2 100
adamc@76 101 | (L'.KUnif (_, _, r1), L'.KUnif (_, _, r2)) =>
adamc@2 102 if r1 = r2 then
adamc@2 103 ()
adamc@2 104 else
adamc@2 105 r1 := SOME k2All
adamc@2 106
adamc@76 107 | (L'.KUnif (_, _, r), _) =>
adamc@2 108 if occursKind r k2All then
adamc@2 109 err KOccursCheckFailed
adamc@2 110 else
adamc@2 111 r := SOME k2All
adamc@76 112 | (_, L'.KUnif (_, _, r)) =>
adamc@2 113 if occursKind r k1All then
adamc@2 114 err KOccursCheckFailed
adamc@2 115 else
adamc@2 116 r := SOME k1All
adamc@2 117
adamc@2 118 | _ => err KIncompatible
adamc@2 119 end
adamc@2 120
adamc@3 121 exception KUnify of L'.kind * L'.kind * kunify_error
adamc@3 122
adamc@3 123 fun unifyKinds k1 k2 =
adamc@3 124 unifyKinds' k1 k2
adamc@3 125 handle KUnify' err => raise KUnify (k1, k2, err)
adamc@3 126
adamc@3 127 datatype con_error =
adamc@3 128 UnboundCon of ErrorMsg.span * string
adamc@157 129 | UnboundDatatype of ErrorMsg.span * string
adamc@34 130 | UnboundStrInCon of ErrorMsg.span * string
adamc@3 131 | WrongKind of L'.con * L'.kind * L'.kind * kunify_error
adamc@67 132 | DuplicateField of ErrorMsg.span * string
adamc@207 133 | ProjBounds of L'.con * int
adamc@207 134 | ProjMismatch of L'.con * L'.kind
adamc@3 135
adamc@5 136 fun conError env err =
adamc@3 137 case err of
adamc@3 138 UnboundCon (loc, s) =>
adamc@3 139 ErrorMsg.errorAt loc ("Unbound constructor variable " ^ s)
adamc@157 140 | UnboundDatatype (loc, s) =>
adamc@157 141 ErrorMsg.errorAt loc ("Unbound datatype " ^ s)
adamc@34 142 | UnboundStrInCon (loc, s) =>
adamc@34 143 ErrorMsg.errorAt loc ("Unbound structure " ^ s)
adamc@3 144 | WrongKind (c, k1, k2, kerr) =>
adamc@3 145 (ErrorMsg.errorAt (#2 c) "Wrong kind";
adamc@5 146 eprefaces' [("Constructor", p_con env c),
adamc@5 147 ("Have kind", p_kind k1),
adamc@5 148 ("Need kind", p_kind k2)];
adamc@3 149 kunifyError kerr)
adamc@67 150 | DuplicateField (loc, s) =>
adamc@67 151 ErrorMsg.errorAt loc ("Duplicate record field " ^ s)
adamc@207 152 | ProjBounds (c, n) =>
adamc@207 153 (ErrorMsg.errorAt (#2 c) "Out of bounds constructor projection";
adamc@207 154 eprefaces' [("Constructor", p_con env c),
adamc@207 155 ("Index", Print.PD.string (Int.toString n))])
adamc@207 156 | ProjMismatch (c, k) =>
adamc@207 157 (ErrorMsg.errorAt (#2 c) "Projection from non-tuple constructor";
adamc@207 158 eprefaces' [("Constructor", p_con env c),
adamc@207 159 ("Kind", p_kind k)])
adamc@3 160
adamc@5 161 fun checkKind env c k1 k2 =
adamc@3 162 unifyKinds k1 k2
adamc@3 163 handle KUnify (k1, k2, err) =>
adamc@5 164 conError env (WrongKind (c, k1, k2, err))
adamc@3 165
adamc@3 166 val dummy = ErrorMsg.dummySpan
adamc@3 167
adamc@3 168 val ktype = (L'.KType, dummy)
adamc@3 169 val kname = (L'.KName, dummy)
adamc@12 170 val ktype_record = (L'.KRecord ktype, dummy)
adamc@3 171
adamc@3 172 val cerror = (L'.CError, dummy)
adamc@3 173 val kerror = (L'.KError, dummy)
adamc@10 174 val eerror = (L'.EError, dummy)
adamc@31 175 val sgnerror = (L'.SgnError, dummy)
adamc@31 176 val strerror = (L'.StrError, dummy)
adamc@3 177
adamc@56 178 val int = ref cerror
adamc@56 179 val float = ref cerror
adamc@56 180 val string = ref cerror
adamc@203 181 val table = ref cerror
adamc@56 182
adamc@3 183 local
adamc@3 184 val count = ref 0
adamc@3 185 in
adamc@3 186
adamc@3 187 fun resetKunif () = count := 0
adamc@3 188
adamc@76 189 fun kunif loc =
adamc@3 190 let
adamc@3 191 val n = !count
adamc@3 192 val s = if n <= 26 then
adamc@3 193 str (chr (ord #"A" + n))
adamc@3 194 else
adamc@3 195 "U" ^ Int.toString (n - 26)
adamc@3 196 in
adamc@3 197 count := n + 1;
adamc@76 198 (L'.KUnif (loc, s, ref NONE), dummy)
adamc@3 199 end
adamc@3 200
adamc@3 201 end
adamc@3 202
adamc@10 203 local
adamc@10 204 val count = ref 0
adamc@10 205 in
adamc@10 206
adamc@10 207 fun resetCunif () = count := 0
adamc@10 208
adamc@76 209 fun cunif (loc, k) =
adamc@10 210 let
adamc@10 211 val n = !count
adamc@10 212 val s = if n <= 26 then
adamc@10 213 str (chr (ord #"A" + n))
adamc@10 214 else
adamc@10 215 "U" ^ Int.toString (n - 26)
adamc@10 216 in
adamc@10 217 count := n + 1;
adamc@76 218 (L'.CUnif (loc, k, s, ref NONE), dummy)
adamc@10 219 end
adamc@10 220
adamc@10 221 end
adamc@10 222
adamc@18 223 fun elabKind (k, loc) =
adamc@18 224 case k of
adamc@18 225 L.KType => (L'.KType, loc)
adamc@18 226 | L.KArrow (k1, k2) => (L'.KArrow (elabKind k1, elabKind k2), loc)
adamc@18 227 | L.KName => (L'.KName, loc)
adamc@18 228 | L.KRecord k => (L'.KRecord (elabKind k), loc)
adamc@82 229 | L.KUnit => (L'.KUnit, loc)
adamc@207 230 | L.KTuple ks => (L'.KTuple (map elabKind ks), loc)
adamc@76 231 | L.KWild => kunif loc
adamc@18 232
adamc@67 233 fun foldKind (dom, ran, loc)=
adamc@67 234 (L'.KArrow ((L'.KArrow ((L'.KName, loc),
adamc@67 235 (L'.KArrow (dom,
adamc@67 236 (L'.KArrow (ran, ran), loc)), loc)), loc),
adamc@67 237 (L'.KArrow (ran,
adamc@67 238 (L'.KArrow ((L'.KRecord dom, loc),
adamc@67 239 ran), loc)), loc)), loc)
adamc@67 240
adamc@207 241 fun hnormKind (kAll as (k, _)) =
adamc@207 242 case k of
adamc@207 243 L'.KUnif (_, _, ref (SOME k)) => hnormKind k
adamc@207 244 | _ => kAll
adamc@207 245
adamc@83 246 fun elabCon (env, denv) (c, loc) =
adamc@3 247 case c of
adamc@3 248 L.CAnnot (c, k) =>
adamc@3 249 let
adamc@3 250 val k' = elabKind k
adamc@83 251 val (c', ck, gs) = elabCon (env, denv) c
adamc@3 252 in
adamc@5 253 checkKind env c' ck k';
adamc@83 254 (c', k', gs)
adamc@3 255 end
adamc@3 256
adamc@3 257 | L.TFun (t1, t2) =>
adamc@3 258 let
adamc@83 259 val (t1', k1, gs1) = elabCon (env, denv) t1
adamc@83 260 val (t2', k2, gs2) = elabCon (env, denv) t2
adamc@3 261 in
adamc@5 262 checkKind env t1' k1 ktype;
adamc@5 263 checkKind env t2' k2 ktype;
adamc@83 264 ((L'.TFun (t1', t2'), loc), ktype, gs1 @ gs2)
adamc@3 265 end
adamc@3 266 | L.TCFun (e, x, k, t) =>
adamc@3 267 let
adamc@3 268 val e' = elabExplicitness e
adamc@3 269 val k' = elabKind k
adamc@3 270 val env' = E.pushCRel env x k'
adamc@83 271 val (t', tk, gs) = elabCon (env', D.enter denv) t
adamc@3 272 in
adamc@5 273 checkKind env t' tk ktype;
adamc@83 274 ((L'.TCFun (e', x, k', t'), loc), ktype, gs)
adamc@3 275 end
adamc@85 276 | L.TDisjoint (c1, c2, c) =>
adamc@85 277 let
adamc@85 278 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@85 279 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@85 280
adamc@85 281 val ku1 = kunif loc
adamc@85 282 val ku2 = kunif loc
adamc@85 283
adamc@90 284 val (denv', gs3) = D.assert env denv (c1', c2')
adamc@90 285 val (c', k, gs4) = elabCon (env, denv') c
adamc@85 286 in
adamc@85 287 checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@85 288 checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@85 289
adamc@90 290 ((L'.TDisjoint (c1', c2', c'), loc), k, gs1 @ gs2 @ gs3 @ gs4)
adamc@85 291 end
adamc@3 292 | L.TRecord c =>
adamc@3 293 let
adamc@83 294 val (c', ck, gs) = elabCon (env, denv) c
adamc@3 295 val k = (L'.KRecord ktype, loc)
adamc@3 296 in
adamc@5 297 checkKind env c' ck k;
adamc@83 298 ((L'.TRecord c', loc), ktype, gs)
adamc@3 299 end
adamc@3 300
adamc@34 301 | L.CVar ([], s) =>
adamc@3 302 (case E.lookupC env s of
adamc@9 303 E.NotBound =>
adamc@5 304 (conError env (UnboundCon (loc, s));
adamc@83 305 (cerror, kerror, []))
adamc@9 306 | E.Rel (n, k) =>
adamc@83 307 ((L'.CRel n, loc), k, [])
adamc@9 308 | E.Named (n, k) =>
adamc@83 309 ((L'.CNamed n, loc), k, []))
adamc@34 310 | L.CVar (m1 :: ms, s) =>
adamc@34 311 (case E.lookupStr env m1 of
adamc@42 312 NONE => (conError env (UnboundStrInCon (loc, m1));
adamc@83 313 (cerror, kerror, []))
adamc@34 314 | SOME (n, sgn) =>
adamc@34 315 let
adamc@34 316 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34 317 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34 318 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@34 319 (strerror, sgnerror))
adamc@34 320 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34 321 ((L'.StrVar n, loc), sgn) ms
adamc@34 322
adamc@34 323 val k = case E.projectCon env {sgn = sgn, str = str, field = s} of
adamc@34 324 NONE => (conError env (UnboundCon (loc, s));
adamc@34 325 kerror)
adamc@34 326 | SOME (k, _) => k
adamc@34 327 in
adamc@83 328 ((L'.CModProj (n, ms, s), loc), k, [])
adamc@34 329 end)
adamc@34 330
adamc@3 331 | L.CApp (c1, c2) =>
adamc@3 332 let
adamc@83 333 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@83 334 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@76 335 val dom = kunif loc
adamc@76 336 val ran = kunif loc
adamc@3 337 in
adamc@5 338 checkKind env c1' k1 (L'.KArrow (dom, ran), loc);
adamc@5 339 checkKind env c2' k2 dom;
adamc@83 340 ((L'.CApp (c1', c2'), loc), ran, gs1 @ gs2)
adamc@3 341 end
adamc@67 342 | L.CAbs (x, ko, t) =>
adamc@3 343 let
adamc@67 344 val k' = case ko of
adamc@76 345 NONE => kunif loc
adamc@67 346 | SOME k => elabKind k
adamc@3 347 val env' = E.pushCRel env x k'
adamc@83 348 val (t', tk, gs) = elabCon (env', D.enter denv) t
adamc@3 349 in
adamc@8 350 ((L'.CAbs (x, k', t'), loc),
adamc@83 351 (L'.KArrow (k', tk), loc),
adamc@83 352 gs)
adamc@3 353 end
adamc@3 354
adamc@84 355 | L.CDisjoint (c1, c2, c) =>
adamc@84 356 let
adamc@84 357 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@84 358 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@84 359
adamc@84 360 val ku1 = kunif loc
adamc@84 361 val ku2 = kunif loc
adamc@84 362
adamc@90 363 val (denv', gs3) = D.assert env denv (c1', c2')
adamc@90 364 val (c', k, gs4) = elabCon (env, denv') c
adamc@84 365 in
adamc@84 366 checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@84 367 checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@84 368
adamc@90 369 ((L'.CDisjoint (c1', c2', c'), loc), k, gs1 @ gs2 @ gs3 @ gs4)
adamc@84 370 end
adamc@84 371
adamc@3 372 | L.CName s =>
adamc@83 373 ((L'.CName s, loc), kname, [])
adamc@3 374
adamc@3 375 | L.CRecord xcs =>
adamc@3 376 let
adamc@76 377 val k = kunif loc
adamc@3 378
adamc@83 379 val (xcs', gs) = ListUtil.foldlMap (fn ((x, c), gs) =>
adamc@83 380 let
adamc@83 381 val (x', xk, gs1) = elabCon (env, denv) x
adamc@83 382 val (c', ck, gs2) = elabCon (env, denv) c
adamc@83 383 in
adamc@83 384 checkKind env x' xk kname;
adamc@83 385 checkKind env c' ck k;
adamc@83 386 ((x', c'), gs1 @ gs2 @ gs)
adamc@83 387 end) [] xcs
adamc@67 388
adamc@67 389 val rc = (L'.CRecord (k, xcs'), loc)
adamc@67 390 (* Add duplicate field checking later. *)
adamc@83 391
adamc@83 392 fun prove (xcs, ds) =
adamc@83 393 case xcs of
adamc@83 394 [] => ds
adamc@83 395 | xc :: rest =>
adamc@83 396 let
adamc@83 397 val r1 = (L'.CRecord (k, [xc]), loc)
adamc@83 398 val ds = foldl (fn (xc', ds) =>
adamc@83 399 let
adamc@83 400 val r2 = (L'.CRecord (k, [xc']), loc)
adamc@83 401 in
adamc@90 402 D.prove env denv (r1, r2, loc) @ ds
adamc@83 403 end)
adamc@83 404 ds rest
adamc@83 405 in
adamc@83 406 prove (rest, ds)
adamc@83 407 end
adamc@3 408 in
adamc@83 409 (rc, (L'.KRecord k, loc), prove (xcs', gs))
adamc@3 410 end
adamc@3 411 | L.CConcat (c1, c2) =>
adamc@3 412 let
adamc@83 413 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@83 414 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@76 415 val ku = kunif loc
adamc@3 416 val k = (L'.KRecord ku, loc)
adamc@3 417 in
adamc@5 418 checkKind env c1' k1 k;
adamc@5 419 checkKind env c2' k2 k;
adamc@83 420 ((L'.CConcat (c1', c2'), loc), k,
adamc@90 421 D.prove env denv (c1', c2', loc) @ gs1 @ gs2)
adamc@3 422 end
adamc@67 423 | L.CFold =>
adamc@67 424 let
adamc@76 425 val dom = kunif loc
adamc@76 426 val ran = kunif loc
adamc@67 427 in
adamc@67 428 ((L'.CFold (dom, ran), loc),
adamc@83 429 foldKind (dom, ran, loc),
adamc@83 430 [])
adamc@67 431 end
adamc@3 432
adamc@83 433 | L.CUnit => ((L'.CUnit, loc), (L'.KUnit, loc), [])
adamc@82 434
adamc@207 435 | L.CTuple cs =>
adamc@207 436 let
adamc@207 437 val (cs', ks, gs) = foldl (fn (c, (cs', ks, gs)) =>
adamc@207 438 let
adamc@207 439 val (c', k, gs') = elabCon (env, denv) c
adamc@207 440 in
adamc@207 441 (c' :: cs', k :: ks, gs' @ gs)
adamc@207 442 end) ([], [], []) cs
adamc@207 443 in
adamc@207 444 ((L'.CTuple (rev cs'), loc), (L'.KTuple (rev ks), loc), gs)
adamc@207 445 end
adamc@207 446 | L.CProj (c, n) =>
adamc@207 447 let
adamc@207 448 val (c', k, gs) = elabCon (env, denv) c
adamc@207 449 in
adamc@207 450 case hnormKind k of
adamc@207 451 (L'.KTuple ks, _) =>
adamc@207 452 if n <= 0 orelse n > length ks then
adamc@207 453 (conError env (ProjBounds (c', n));
adamc@207 454 (cerror, kerror, []))
adamc@207 455 else
adamc@207 456 ((L'.CProj (c', n), loc), List.nth (ks, n - 1), gs)
adamc@207 457 | k => (conError env (ProjMismatch (c', k));
adamc@207 458 (cerror, kerror, []))
adamc@207 459 end
adamc@207 460
adamc@18 461 | L.CWild k =>
adamc@18 462 let
adamc@18 463 val k' = elabKind k
adamc@18 464 in
adamc@83 465 (cunif (loc, k'), k', [])
adamc@18 466 end
adamc@18 467
adamc@6 468 fun kunifsRemain k =
adamc@6 469 case k of
adamc@76 470 L'.KUnif (_, _, ref NONE) => true
adamc@6 471 | _ => false
adamc@10 472 fun cunifsRemain c =
adamc@10 473 case c of
adamc@76 474 L'.CUnif (loc, _, _, ref NONE) => SOME loc
adamc@76 475 | _ => NONE
adamc@6 476
adamc@76 477 val kunifsInDecl = U.Decl.exists {kind = kunifsRemain,
adamc@76 478 con = fn _ => false,
adamc@76 479 exp = fn _ => false,
adamc@76 480 sgn_item = fn _ => false,
adamc@76 481 sgn = fn _ => false,
adamc@76 482 str = fn _ => false,
adamc@76 483 decl = fn _ => false}
adamc@10 484
adamc@76 485 val cunifsInDecl = U.Decl.search {kind = fn _ => NONE,
adamc@76 486 con = cunifsRemain,
adamc@76 487 exp = fn _ => NONE,
adamc@76 488 sgn_item = fn _ => NONE,
adamc@76 489 sgn = fn _ => NONE,
adamc@76 490 str = fn _ => NONE,
adamc@76 491 decl = fn _ => NONE}
adamc@10 492
adamc@10 493 fun occursCon r =
adamc@10 494 U.Con.exists {kind = fn _ => false,
adamc@76 495 con = fn L'.CUnif (_, _, _, r') => r = r'
adamc@10 496 | _ => false}
adamc@10 497
adamc@10 498 datatype cunify_error =
adamc@10 499 CKind of L'.kind * L'.kind * kunify_error
adamc@10 500 | COccursCheckFailed of L'.con * L'.con
adamc@10 501 | CIncompatible of L'.con * L'.con
adamc@10 502 | CExplicitness of L'.con * L'.con
adamc@141 503 | CKindof of L'.kind * L'.con
adamc@153 504 | CRecordFailure of PD.pp_desc * PD.pp_desc
adamc@10 505
adamc@10 506 exception CUnify' of cunify_error
adamc@10 507
adamc@10 508 fun cunifyError env err =
adamc@10 509 case err of
adamc@10 510 CKind (k1, k2, kerr) =>
adamc@10 511 (eprefaces "Kind unification failure"
adamc@10 512 [("Kind 1", p_kind k1),
adamc@10 513 ("Kind 2", p_kind k2)];
adamc@10 514 kunifyError kerr)
adamc@10 515 | COccursCheckFailed (c1, c2) =>
adamc@10 516 eprefaces "Constructor occurs check failed"
adamc@10 517 [("Con 1", p_con env c1),
adamc@10 518 ("Con 2", p_con env c2)]
adamc@10 519 | CIncompatible (c1, c2) =>
adamc@10 520 eprefaces "Incompatible constructors"
adamc@10 521 [("Con 1", p_con env c1),
adamc@10 522 ("Con 2", p_con env c2)]
adamc@10 523 | CExplicitness (c1, c2) =>
adamc@10 524 eprefaces "Differing constructor function explicitness"
adamc@10 525 [("Con 1", p_con env c1),
adamc@10 526 ("Con 2", p_con env c2)]
adamc@141 527 | CKindof (k, c) =>
adamc@147 528 eprefaces "Unexpected kind for kindof calculation"
adamc@141 529 [("Kind", p_kind k),
adamc@141 530 ("Con", p_con env c)]
adamc@153 531 | CRecordFailure (s1, s2) =>
adamc@153 532 eprefaces "Can't unify record constructors"
adamc@153 533 [("Summary 1", s1),
adamc@153 534 ("Summary 2", s2)]
adamc@10 535
adamc@13 536 exception SynUnif = E.SynUnif
adamc@12 537
adamc@81 538 open ElabOps
adamc@43 539
adamc@12 540 type record_summary = {
adamc@12 541 fields : (L'.con * L'.con) list,
adamc@12 542 unifs : (L'.con * L'.con option ref) list,
adamc@12 543 others : L'.con list
adamc@12 544 }
adamc@12 545
adamc@12 546 fun summaryToCon {fields, unifs, others} =
adamc@12 547 let
adamc@12 548 val c = (L'.CRecord (ktype, []), dummy)
adamc@12 549 val c = List.foldr (fn (c', c) => (L'.CConcat (c', c), dummy)) c others
adamc@12 550 val c = List.foldr (fn ((c', _), c) => (L'.CConcat (c', c), dummy)) c unifs
adamc@12 551 in
adamc@12 552 (L'.CConcat ((L'.CRecord (ktype, fields), dummy), c), dummy)
adamc@12 553 end
adamc@12 554
adamc@12 555 fun p_summary env s = p_con env (summaryToCon s)
adamc@12 556
adamc@12 557 exception CUnify of L'.con * L'.con * cunify_error
adamc@12 558
adamc@12 559 fun kindof env (c, loc) =
adamc@12 560 case c of
adamc@12 561 L'.TFun _ => ktype
adamc@12 562 | L'.TCFun _ => ktype
adamc@85 563 | L'.TDisjoint _ => ktype
adamc@12 564 | L'.TRecord _ => ktype
adamc@12 565
adamc@12 566 | L'.CRel xn => #2 (E.lookupCRel env xn)
adamc@12 567 | L'.CNamed xn => #2 (E.lookupCNamed env xn)
adamc@34 568 | L'.CModProj (n, ms, x) =>
adamc@34 569 let
adamc@34 570 val (_, sgn) = E.lookupStrNamed env n
adamc@34 571 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34 572 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34 573 NONE => raise Fail "kindof: Unknown substructure"
adamc@34 574 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34 575 ((L'.StrVar n, loc), sgn) ms
adamc@34 576 in
adamc@34 577 case E.projectCon env {sgn = sgn, str = str, field = x} of
adamc@34 578 NONE => raise Fail "kindof: Unknown con in structure"
adamc@34 579 | SOME (k, _) => k
adamc@34 580 end
adamc@34 581
adamc@12 582 | L'.CApp (c, _) =>
adamc@141 583 (case hnormKind (kindof env c) of
adamc@141 584 (L'.KArrow (_, k), _) => k
adamc@141 585 | (L'.KError, _) => kerror
adamc@141 586 | k => raise CUnify' (CKindof (k, c)))
adamc@12 587 | L'.CAbs (x, k, c) => (L'.KArrow (k, kindof (E.pushCRel env x k) c), loc)
adamc@84 588 | L'.CDisjoint (_, _, c) => kindof env c
adamc@12 589
adamc@12 590 | L'.CName _ => kname
adamc@12 591
adamc@12 592 | L'.CRecord (k, _) => (L'.KRecord k, loc)
adamc@12 593 | L'.CConcat (c, _) => kindof env c
adamc@67 594 | L'.CFold (dom, ran) => foldKind (dom, ran, loc)
adamc@12 595
adamc@82 596 | L'.CUnit => (L'.KUnit, loc)
adamc@82 597
adamc@207 598 | L'.CTuple cs => (L'.KTuple (map (kindof env) cs), loc)
adamc@207 599 | L'.CProj (c, n) =>
adamc@207 600 (case hnormKind (kindof env c) of
adamc@207 601 (L'.KTuple ks, _) => List.nth (ks, n - 1)
adamc@207 602 | k => raise CUnify' (CKindof (k, c)))
adamc@207 603
adamc@12 604 | L'.CError => kerror
adamc@76 605 | L'.CUnif (_, k, _, _) => k
adamc@12 606
adamc@90 607 val hnormCon = D.hnormCon
adamc@86 608
adamc@205 609 datatype con_summary =
adamc@205 610 Nil
adamc@205 611 | Cons
adamc@205 612 | Unknown
adamc@205 613
adamc@205 614 fun compatible cs =
adamc@205 615 case cs of
adamc@205 616 (Unknown, _) => false
adamc@205 617 | (_, Unknown) => false
adamc@205 618 | (s1, s2) => s1 = s2
adamc@205 619
adamc@205 620 fun summarizeCon (env, denv) c =
adamc@205 621 let
adamc@205 622 val (c, gs) = hnormCon (env, denv) c
adamc@205 623 in
adamc@205 624 case #1 c of
adamc@205 625 L'.CRecord (_, []) => (Nil, gs)
adamc@205 626 | L'.CRecord (_, _ :: _) => (Cons, gs)
adamc@205 627 | L'.CConcat ((L'.CRecord (_, _ :: _), _), _) => (Cons, gs)
adamc@205 628 | L'.CDisjoint (_, _, c) =>
adamc@205 629 let
adamc@205 630 val (s, gs') = summarizeCon (env, denv) c
adamc@205 631 in
adamc@205 632 (s, gs @ gs')
adamc@205 633 end
adamc@205 634 | _ => (Unknown, gs)
adamc@205 635 end
adamc@205 636
adamc@205 637 fun p_con_summary s =
adamc@205 638 Print.PD.string (case s of
adamc@205 639 Nil => "Nil"
adamc@205 640 | Cons => "Cons"
adamc@205 641 | Unknown => "Unknown")
adamc@205 642
adamc@223 643 exception SummaryFailure
adamc@223 644
adamc@86 645 fun unifyRecordCons (env, denv) (c1, c2) =
adamc@12 646 let
adamc@92 647 fun rkindof c =
adamc@147 648 case hnormKind (kindof env c) of
adamc@92 649 (L'.KRecord k, _) => k
adamc@141 650 | (L'.KError, _) => kerror
adamc@141 651 | k => raise CUnify' (CKindof (k, c))
adamc@92 652
adamc@92 653 val k1 = rkindof c1
adamc@92 654 val k2 = rkindof c2
adamc@86 655
adamc@86 656 val (r1, gs1) = recordSummary (env, denv) c1
adamc@86 657 val (r2, gs2) = recordSummary (env, denv) c2
adamc@12 658 in
adamc@12 659 unifyKinds k1 k2;
adamc@86 660 unifySummaries (env, denv) (k1, r1, r2);
adamc@86 661 gs1 @ gs2
adamc@12 662 end
adamc@12 663
adamc@86 664 and recordSummary (env, denv) c =
adamc@86 665 let
adamc@86 666 val (c, gs) = hnormCon (env, denv) c
adamc@12 667
adamc@86 668 val (sum, gs') =
adamc@86 669 case c of
adamc@86 670 (L'.CRecord (_, xcs), _) => ({fields = xcs, unifs = [], others = []}, [])
adamc@86 671 | (L'.CConcat (c1, c2), _) =>
adamc@86 672 let
adamc@86 673 val (s1, gs1) = recordSummary (env, denv) c1
adamc@86 674 val (s2, gs2) = recordSummary (env, denv) c2
adamc@86 675 in
adamc@86 676 ({fields = #fields s1 @ #fields s2,
adamc@86 677 unifs = #unifs s1 @ #unifs s2,
adamc@86 678 others = #others s1 @ #others s2},
adamc@86 679 gs1 @ gs2)
adamc@86 680 end
adamc@86 681 | (L'.CUnif (_, _, _, ref (SOME c)), _) => recordSummary (env, denv) c
adamc@86 682 | c' as (L'.CUnif (_, _, _, r), _) => ({fields = [], unifs = [(c', r)], others = []}, [])
adamc@86 683 | c' => ({fields = [], unifs = [], others = [c']}, [])
adamc@86 684 in
adamc@86 685 (sum, gs @ gs')
adamc@86 686 end
adamc@86 687
adamc@86 688 and consEq (env, denv) (c1, c2) =
adamc@209 689 let
adamc@209 690 val gs = unifyCons (env, denv) c1 c2
adamc@209 691 in
adamc@209 692 List.all (fn (loc, env, denv, c1, c2) =>
adamc@209 693 case D.prove env denv (c1, c2, loc) of
adamc@209 694 [] => true
adamc@209 695 | _ => false) gs
adamc@209 696 end
adamc@12 697 handle CUnify _ => false
adamc@12 698
adamc@80 699 and consNeq env (c1, c2) =
adamc@86 700 case (#1 (ElabOps.hnormCon env c1), #1 (ElabOps.hnormCon env c2)) of
adamc@80 701 (L'.CName x1, L'.CName x2) => x1 <> x2
adamc@80 702 | _ => false
adamc@80 703
adamc@86 704 and unifySummaries (env, denv) (k, s1 : record_summary, s2 : record_summary) =
adamc@12 705 let
adamc@223 706 val loc = #2 k
adamc@14 707 (*val () = eprefaces "Summaries" [("#1", p_summary env s1),
adamc@223 708 ("#2", p_summary env s2)]*)
adamc@12 709
adamc@12 710 fun eatMatching p (ls1, ls2) =
adamc@12 711 let
adamc@12 712 fun em (ls1, ls2, passed1) =
adamc@12 713 case ls1 of
adamc@12 714 [] => (rev passed1, ls2)
adamc@12 715 | h1 :: t1 =>
adamc@12 716 let
adamc@12 717 fun search (ls2', passed2) =
adamc@12 718 case ls2' of
adamc@12 719 [] => em (t1, ls2, h1 :: passed1)
adamc@12 720 | h2 :: t2 =>
adamc@12 721 if p (h1, h2) then
adamc@12 722 em (t1, List.revAppend (passed2, t2), passed1)
adamc@12 723 else
adamc@12 724 search (t2, h2 :: passed2)
adamc@12 725 in
adamc@12 726 search (ls2, [])
adamc@12 727 end
adamc@12 728 in
adamc@12 729 em (ls1, ls2, [])
adamc@12 730 end
adamc@12 731
adamc@12 732 val (fs1, fs2) = eatMatching (fn ((x1, c1), (x2, c2)) =>
adamc@80 733 not (consNeq env (x1, x2))
adamc@86 734 andalso consEq (env, denv) (c1, c2)
adamc@86 735 andalso consEq (env, denv) (x1, x2))
adamc@79 736 (#fields s1, #fields s2)
adamc@14 737 (*val () = eprefaces "Summaries2" [("#1", p_summary env {fields = fs1, unifs = #unifs s1, others = #others s1}),
adamc@223 738 ("#2", p_summary env {fields = fs2, unifs = #unifs s2, others = #others s2})]*)
adamc@12 739 val (unifs1, unifs2) = eatMatching (fn ((_, r1), (_, r2)) => r1 = r2) (#unifs s1, #unifs s2)
adamc@86 740 val (others1, others2) = eatMatching (consEq (env, denv)) (#others s1, #others s2)
adamc@223 741 (*val () = eprefaces "Summaries3" [("#1", p_summary env {fields = fs1, unifs = unifs1, others = others1}),
adamc@223 742 ("#2", p_summary env {fields = fs2, unifs = unifs2, others = others2})]*)
adamc@12 743
adamc@12 744 fun unifFields (fs, others, unifs) =
adamc@12 745 case (fs, others, unifs) of
adamc@12 746 ([], [], _) => ([], [], unifs)
adamc@12 747 | (_, _, []) => (fs, others, [])
adamc@12 748 | (_, _, (_, r) :: rest) =>
adamc@12 749 let
adamc@12 750 val r' = ref NONE
adamc@141 751 val kr = (L'.KRecord k, dummy)
adamc@141 752 val cr' = (L'.CUnif (dummy, kr, "recd", r'), dummy)
adamc@12 753
adamc@12 754 val prefix = case (fs, others) of
adamc@12 755 ([], other :: others) =>
adamc@12 756 List.foldl (fn (other, c) =>
adamc@12 757 (L'.CConcat (c, other), dummy))
adamc@12 758 other others
adamc@12 759 | (fs, []) =>
adamc@12 760 (L'.CRecord (k, fs), dummy)
adamc@12 761 | (fs, others) =>
adamc@12 762 List.foldl (fn (other, c) =>
adamc@12 763 (L'.CConcat (c, other), dummy))
adamc@12 764 (L'.CRecord (k, fs), dummy) others
adamc@12 765 in
adamc@12 766 r := SOME (L'.CConcat (prefix, cr'), dummy);
adamc@12 767 ([], [], (cr', r') :: rest)
adamc@12 768 end
adamc@12 769
adamc@12 770 val (fs1, others1, unifs2) = unifFields (fs1, others1, unifs2)
adamc@12 771 val (fs2, others2, unifs1) = unifFields (fs2, others2, unifs1)
adamc@12 772
adamc@223 773 (*val () = eprefaces "Summaries4" [("#1", p_summary env {fields = fs1, unifs = unifs1, others = others1}),
adamc@223 774 ("#2", p_summary env {fields = fs2, unifs = unifs2, others = others2})]*)
adamc@223 775
adamc@223 776 fun isGuessable (other, fs) =
adamc@223 777 let
adamc@223 778 val gs = guessFold (env, denv) (other, (L'.CRecord (k, fs), loc), [], SummaryFailure)
adamc@223 779 in
adamc@223 780 List.all (fn (loc, env, denv, c1, c2) =>
adamc@223 781 case D.prove env denv (c1, c2, loc) of
adamc@223 782 [] => true
adamc@223 783 | _ => false) gs
adamc@223 784 end
adamc@223 785 handle SummaryFailure => false
adamc@223 786
adamc@223 787 val (fs1, fs2, others1, others2) =
adamc@223 788 case (fs1, fs2, others1, others2) of
adamc@223 789 ([], _, [other1], []) =>
adamc@223 790 if isGuessable (other1, fs2) then
adamc@223 791 ([], [], [], [])
adamc@223 792 else
adamc@223 793 (fs1, fs2, others1, others2)
adamc@223 794 | _ => (fs1, fs2, others1, others2)
adamc@223 795
adamc@223 796 (*val () = eprefaces "Summaries5" [("#1", p_summary env {fields = fs1, unifs = unifs1, others = others1}),
adamc@223 797 ("#2", p_summary env {fields = fs2, unifs = unifs2, others = others2})]*)
adamc@223 798
adamc@86 799 val clear = case (fs1, others1, fs2, others2) of
adamc@86 800 ([], [], [], []) => true
adamc@12 801 | _ => false
adamc@12 802 val empty = (L'.CRecord (k, []), dummy)
adamc@223 803
adamc@12 804 fun pairOffUnifs (unifs1, unifs2) =
adamc@12 805 case (unifs1, unifs2) of
adamc@12 806 ([], _) =>
adamc@86 807 if clear then
adamc@12 808 List.app (fn (_, r) => r := SOME empty) unifs2
adamc@12 809 else
adamc@153 810 raise CUnify' (CRecordFailure (p_summary env s1, p_summary env s2))
adamc@12 811 | (_, []) =>
adamc@86 812 if clear then
adamc@12 813 List.app (fn (_, r) => r := SOME empty) unifs1
adamc@12 814 else
adamc@153 815 raise CUnify' (CRecordFailure (p_summary env s1, p_summary env s2))
adamc@12 816 | ((c1, _) :: rest1, (_, r2) :: rest2) =>
adamc@12 817 (r2 := SOME c1;
adamc@12 818 pairOffUnifs (rest1, rest2))
adamc@12 819 in
adamc@12 820 pairOffUnifs (unifs1, unifs2)
adamc@223 821 (*before eprefaces "Summaries'" [("#1", p_summary env s1),
adamc@223 822 ("#2", p_summary env s2)]*)
adamc@223 823 end
adamc@223 824
adamc@223 825 and guessFold (env, denv) (c1, c2, gs, ex) =
adamc@223 826 let
adamc@223 827 val loc = #2 c1
adamc@223 828
adamc@223 829 fun unfold (dom, ran, f, i, r, c) =
adamc@223 830 let
adamc@223 831 val nm = cunif (loc, (L'.KName, loc))
adamc@223 832 val v = cunif (loc, dom)
adamc@223 833 val rest = cunif (loc, (L'.KRecord dom, loc))
adamc@223 834 val acc = (L'.CFold (dom, ran), loc)
adamc@223 835 val acc = (L'.CApp (acc, f), loc)
adamc@223 836 val acc = (L'.CApp (acc, i), loc)
adamc@223 837 val acc = (L'.CApp (acc, rest), loc)
adamc@223 838
adamc@223 839 val (iS, gs3) = summarizeCon (env, denv) i
adamc@223 840
adamc@223 841 val app = (L'.CApp (f, nm), loc)
adamc@223 842 val app = (L'.CApp (app, v), loc)
adamc@223 843 val app = (L'.CApp (app, acc), loc)
adamc@223 844 val (appS, gs4) = summarizeCon (env, denv) app
adamc@223 845
adamc@223 846 val (cS, gs5) = summarizeCon (env, denv) c
adamc@223 847 in
adamc@223 848 (*prefaces "Summaries" [("iS", p_con_summary iS),
adamc@223 849 ("appS", p_con_summary appS),
adamc@223 850 ("cS", p_con_summary cS)];*)
adamc@223 851
adamc@223 852 if compatible (iS, appS) then
adamc@223 853 raise ex
adamc@223 854 else if compatible (cS, iS) then
adamc@223 855 let
adamc@223 856 (*val () = prefaces "Same?" [("i", p_con env i),
adamc@223 857 ("c", p_con env c)]*)
adamc@223 858 val gs6 = unifyCons (env, denv) i c
adamc@223 859 (*val () = TextIO.print "Yes!\n"*)
adamc@223 860
adamc@223 861 val gs7 = unifyCons (env, denv) r (L'.CRecord (dom, []), loc)
adamc@223 862 in
adamc@223 863 gs @ gs3 @ gs5 @ gs6 @ gs7
adamc@223 864 end
adamc@223 865 else if compatible (cS, appS) then
adamc@223 866 let
adamc@223 867 (*val () = prefaces "Same?" [("app", p_con env app),
adamc@223 868 ("c", p_con env c),
adamc@223 869 ("app'", p_con env (#1 (hnormCon (env, denv) app)))]*)
adamc@223 870 val gs6 = unifyCons (env, denv) app c
adamc@223 871 (*val () = TextIO.print "Yes!\n"*)
adamc@223 872
adamc@223 873 val singleton = (L'.CRecord (dom, [(nm, v)]), loc)
adamc@223 874 val concat = (L'.CConcat (singleton, rest), loc)
adamc@223 875 (*val () = prefaces "Pre-crew" [("r", p_con env r),
adamc@223 876 ("concat", p_con env concat)]*)
adamc@223 877 val gs7 = unifyCons (env, denv) r concat
adamc@223 878 in
adamc@223 879 (*prefaces "The crew" [("nm", p_con env nm),
adamc@223 880 ("v", p_con env v),
adamc@223 881 ("rest", p_con env rest)];*)
adamc@223 882
adamc@223 883 gs @ gs3 @ gs4 @ gs5 @ gs6 @ gs7
adamc@223 884 end
adamc@223 885 else
adamc@223 886 raise ex
adamc@223 887 end
adamc@223 888 handle _ => raise ex
adamc@223 889 in
adamc@223 890 case (#1 c1, #1 c2) of
adamc@223 891 (L'.CApp ((L'.CApp ((L'.CApp ((L'.CFold (dom, ran), _), f), _), i), _), r), _) =>
adamc@223 892 unfold (dom, ran, f, i, r, c2)
adamc@223 893 | (_, L'.CApp ((L'.CApp ((L'.CApp ((L'.CFold (dom, ran), _), f), _), i), _), r)) =>
adamc@223 894 unfold (dom, ran, f, i, r, c1)
adamc@223 895 | _ => raise ex
adamc@12 896 end
adamc@12 897
adamc@86 898 and unifyCons' (env, denv) c1 c2 =
adamc@86 899 let
adamc@86 900 val (c1, gs1) = hnormCon (env, denv) c1
adamc@86 901 val (c2, gs2) = hnormCon (env, denv) c2
adamc@86 902 in
adamc@205 903 let
adamc@205 904 val gs3 = unifyCons'' (env, denv) c1 c2
adamc@205 905 in
adamc@205 906 gs1 @ gs2 @ gs3
adamc@205 907 end
adamc@223 908 handle ex => guessFold (env, denv) (c1, c2, gs1 @ gs2, ex)
adamc@86 909 end
adamc@11 910
adamc@205 911 and unifyCons'' (env, denv) (c1All as (c1, loc)) (c2All as (c2, _)) =
adamc@10 912 let
adamc@210 913 fun err f = raise CUnify' (f (c1All, c2All))
adamc@12 914
adamc@86 915 fun isRecord () = unifyRecordCons (env, denv) (c1All, c2All)
adamc@10 916 in
adamc@92 917 (*eprefaces "unifyCons''" [("c1All", p_con env c1All),
adamc@92 918 ("c2All", p_con env c2All)];*)
adamc@92 919
adamc@10 920 case (c1, c2) of
adamc@88 921 (L'.CUnit, L'.CUnit) => []
adamc@88 922
adamc@88 923 | (L'.TFun (d1, r1), L'.TFun (d2, r2)) =>
adamc@86 924 unifyCons' (env, denv) d1 d2
adamc@86 925 @ unifyCons' (env, denv) r1 r2
adamc@10 926 | (L'.TCFun (expl1, x1, d1, r1), L'.TCFun (expl2, _, d2, r2)) =>
adamc@10 927 if expl1 <> expl2 then
adamc@10 928 err CExplicitness
adamc@10 929 else
adamc@10 930 (unifyKinds d1 d2;
adamc@86 931 unifyCons' (E.pushCRel env x1 d1, D.enter denv) r1 r2)
adamc@86 932 | (L'.TRecord r1, L'.TRecord r2) => unifyCons' (env, denv) r1 r2
adamc@10 933
adamc@10 934 | (L'.CRel n1, L'.CRel n2) =>
adamc@10 935 if n1 = n2 then
adamc@86 936 []
adamc@10 937 else
adamc@10 938 err CIncompatible
adamc@10 939 | (L'.CNamed n1, L'.CNamed n2) =>
adamc@10 940 if n1 = n2 then
adamc@86 941 []
adamc@10 942 else
adamc@10 943 err CIncompatible
adamc@10 944
adamc@10 945 | (L'.CApp (d1, r1), L'.CApp (d2, r2)) =>
adamc@86 946 (unifyCons' (env, denv) d1 d2;
adamc@86 947 unifyCons' (env, denv) r1 r2)
adamc@10 948 | (L'.CAbs (x1, k1, c1), L'.CAbs (_, k2, c2)) =>
adamc@10 949 (unifyKinds k1 k2;
adamc@86 950 unifyCons' (E.pushCRel env x1 k1, D.enter denv) c1 c2)
adamc@10 951
adamc@10 952 | (L'.CName n1, L'.CName n2) =>
adamc@10 953 if n1 = n2 then
adamc@86 954 []
adamc@10 955 else
adamc@10 956 err CIncompatible
adamc@10 957
adamc@34 958 | (L'.CModProj (n1, ms1, x1), L'.CModProj (n2, ms2, x2)) =>
adamc@34 959 if n1 = n2 andalso ms1 = ms2 andalso x1 = x2 then
adamc@86 960 []
adamc@34 961 else
adamc@34 962 err CIncompatible
adamc@34 963
adamc@207 964 | (L'.CTuple cs1, L'.CTuple cs2) =>
adamc@207 965 ((ListPair.foldlEq (fn (c1, c2, gs) =>
adamc@207 966 let
adamc@207 967 val gs' = unifyCons' (env, denv) c1 c2
adamc@207 968 in
adamc@207 969 gs' @ gs
adamc@207 970 end) [] (cs1, cs2))
adamc@207 971 handle ListPair.UnequalLengths => err CIncompatible)
adamc@207 972 | (L'.CProj (c1, n1), L'.CProj (c2, n2)) =>
adamc@207 973 if n1 = n2 then
adamc@207 974 unifyCons' (env, denv) c1 c2
adamc@207 975 else
adamc@207 976 err CIncompatible
adamc@207 977
adamc@86 978 | (L'.CError, _) => []
adamc@86 979 | (_, L'.CError) => []
adamc@10 980
adamc@92 981 | (L'.CRecord _, _) => isRecord ()
adamc@92 982 | (_, L'.CRecord _) => isRecord ()
adamc@92 983 | (L'.CConcat _, _) => isRecord ()
adamc@92 984 | (_, L'.CConcat _) => isRecord ()
adamc@10 985
adamc@76 986 | (L'.CUnif (_, k1, _, r1), L'.CUnif (_, k2, _, r2)) =>
adamc@10 987 if r1 = r2 then
adamc@86 988 []
adamc@10 989 else
adamc@10 990 (unifyKinds k1 k2;
adamc@86 991 r1 := SOME c2All;
adamc@86 992 [])
adamc@10 993
adamc@76 994 | (L'.CUnif (_, _, _, r), _) =>
adamc@10 995 if occursCon r c2All then
adamc@10 996 err COccursCheckFailed
adamc@10 997 else
adamc@86 998 (r := SOME c2All;
adamc@86 999 [])
adamc@76 1000 | (_, L'.CUnif (_, _, _, r)) =>
adamc@10 1001 if occursCon r c1All then
adamc@10 1002 err COccursCheckFailed
adamc@10 1003 else
adamc@86 1004 (r := SOME c1All;
adamc@86 1005 [])
adamc@10 1006
adamc@71 1007 | (L'.CFold (dom1, ran1), L'.CFold (dom2, ran2)) =>
adamc@71 1008 (unifyKinds dom1 dom2;
adamc@86 1009 unifyKinds ran1 ran2;
adamc@86 1010 [])
adamc@71 1011
adamc@10 1012 | _ => err CIncompatible
adamc@10 1013 end
adamc@10 1014
adamc@86 1015 and unifyCons (env, denv) c1 c2 =
adamc@86 1016 unifyCons' (env, denv) c1 c2
adamc@10 1017 handle CUnify' err => raise CUnify (c1, c2, err)
adamc@10 1018 | KUnify args => raise CUnify (c1, c2, CKind args)
adamc@10 1019
adamc@10 1020 datatype exp_error =
adamc@10 1021 UnboundExp of ErrorMsg.span * string
adamc@34 1022 | UnboundStrInExp of ErrorMsg.span * string
adamc@10 1023 | Unify of L'.exp * L'.con * L'.con * cunify_error
adamc@11 1024 | Unif of string * L'.con
adamc@11 1025 | WrongForm of string * L'.exp * L'.con
adamc@92 1026 | IncompatibleCons of L'.con * L'.con
adamc@171 1027 | DuplicatePatternVariable of ErrorMsg.span * string
adamc@171 1028 | PatUnify of L'.pat * L'.con * L'.con * cunify_error
adamc@174 1029 | UnboundConstructor of ErrorMsg.span * string list * string
adamc@171 1030 | PatHasArg of ErrorMsg.span
adamc@171 1031 | PatHasNoArg of ErrorMsg.span
adamc@172 1032 | Inexhaustive of ErrorMsg.span
adamc@175 1033 | DuplicatePatField of ErrorMsg.span * string
adamc@211 1034 | Unresolvable of ErrorMsg.span * L'.con
adamc@220 1035 | OutOfContext of ErrorMsg.span * (L'.exp * L'.con) option
adamc@238 1036 | IllegalRec of string * L'.exp
adamc@10 1037
adamc@10 1038 fun expError env err =
adamc@10 1039 case err of
adamc@10 1040 UnboundExp (loc, s) =>
adamc@10 1041 ErrorMsg.errorAt loc ("Unbound expression variable " ^ s)
adamc@34 1042 | UnboundStrInExp (loc, s) =>
adamc@34 1043 ErrorMsg.errorAt loc ("Unbound structure " ^ s)
adamc@10 1044 | Unify (e, c1, c2, uerr) =>
adamc@10 1045 (ErrorMsg.errorAt (#2 e) "Unification failure";
adamc@10 1046 eprefaces' [("Expression", p_exp env e),
adamc@10 1047 ("Have con", p_con env c1),
adamc@10 1048 ("Need con", p_con env c2)];
adamc@10 1049 cunifyError env uerr)
adamc@11 1050 | Unif (action, c) =>
adamc@11 1051 (ErrorMsg.errorAt (#2 c) ("Unification variable blocks " ^ action);
adamc@11 1052 eprefaces' [("Con", p_con env c)])
adamc@11 1053 | WrongForm (variety, e, t) =>
adamc@11 1054 (ErrorMsg.errorAt (#2 e) ("Expression is not a " ^ variety);
adamc@11 1055 eprefaces' [("Expression", p_exp env e),
adamc@11 1056 ("Type", p_con env t)])
adamc@92 1057 | IncompatibleCons (c1, c2) =>
adamc@92 1058 (ErrorMsg.errorAt (#2 c1) "Incompatible constructors";
adamc@92 1059 eprefaces' [("Con 1", p_con env c1),
adamc@92 1060 ("Con 2", p_con env c2)])
adamc@171 1061 | DuplicatePatternVariable (loc, s) =>
adamc@171 1062 ErrorMsg.errorAt loc ("Duplicate pattern variable " ^ s)
adamc@171 1063 | PatUnify (p, c1, c2, uerr) =>
adamc@171 1064 (ErrorMsg.errorAt (#2 p) "Unification failure for pattern";
adamc@171 1065 eprefaces' [("Pattern", p_pat env p),
adamc@171 1066 ("Have con", p_con env c1),
adamc@171 1067 ("Need con", p_con env c2)];
adamc@171 1068 cunifyError env uerr)
adamc@174 1069 | UnboundConstructor (loc, ms, s) =>
adamc@174 1070 ErrorMsg.errorAt loc ("Unbound constructor " ^ String.concatWith "." (ms @ [s]) ^ " in pattern")
adamc@171 1071 | PatHasArg loc =>
adamc@171 1072 ErrorMsg.errorAt loc "Constructor expects no argument but is used with argument"
adamc@171 1073 | PatHasNoArg loc =>
adamc@171 1074 ErrorMsg.errorAt loc "Constructor expects argument but is used with no argument"
adamc@172 1075 | Inexhaustive loc =>
adamc@172 1076 ErrorMsg.errorAt loc "Inexhaustive 'case'"
adamc@175 1077 | DuplicatePatField (loc, s) =>
adamc@175 1078 ErrorMsg.errorAt loc ("Duplicate record field " ^ s ^ " in pattern")
adamc@220 1079 | OutOfContext (loc, co) =>
adamc@220 1080 (ErrorMsg.errorAt loc "Type class wildcard occurs out of context";
adamc@220 1081 Option.app (fn (e, c) => eprefaces' [("Function", p_exp env e),
adamc@220 1082 ("Type", p_con env c)]) co)
adamc@211 1083 | Unresolvable (loc, c) =>
adamc@211 1084 (ErrorMsg.errorAt loc "Can't resolve type class instance";
adamc@211 1085 eprefaces' [("Class constraint", p_con env c)])
adamc@238 1086 | IllegalRec (x, e) =>
adamc@238 1087 (ErrorMsg.errorAt (#2 e) "Illegal 'val rec' righthand side (must be a function abstraction)";
adamc@238 1088 eprefaces' [("Variable", PD.string x),
adamc@238 1089 ("Expression", p_exp env e)])
adamc@210 1090
adamc@86 1091 fun checkCon (env, denv) e c1 c2 =
adamc@86 1092 unifyCons (env, denv) c1 c2
adamc@10 1093 handle CUnify (c1, c2, err) =>
adamc@86 1094 (expError env (Unify (e, c1, c2, err));
adamc@86 1095 [])
adamc@10 1096
adamc@171 1097 fun checkPatCon (env, denv) p c1 c2 =
adamc@171 1098 unifyCons (env, denv) c1 c2
adamc@171 1099 handle CUnify (c1, c2, err) =>
adamc@171 1100 (expError env (PatUnify (p, c1, c2, err));
adamc@171 1101 [])
adamc@171 1102
adamc@14 1103 fun primType env p =
adamc@56 1104 case p of
adamc@56 1105 P.Int _ => !int
adamc@56 1106 | P.Float _ => !float
adamc@56 1107 | P.String _ => !string
adamc@14 1108
adamc@71 1109 fun recCons (k, nm, v, rest, loc) =
adamc@71 1110 (L'.CConcat ((L'.CRecord (k, [(nm, v)]), loc),
adamc@71 1111 rest), loc)
adamc@71 1112
adamc@71 1113 fun foldType (dom, loc) =
adamc@71 1114 (L'.TCFun (L'.Explicit, "ran", (L'.KArrow ((L'.KRecord dom, loc), (L'.KType, loc)), loc),
adamc@71 1115 (L'.TFun ((L'.TCFun (L'.Explicit, "nm", (L'.KName, loc),
adamc@71 1116 (L'.TCFun (L'.Explicit, "v", dom,
adamc@71 1117 (L'.TCFun (L'.Explicit, "rest", (L'.KRecord dom, loc),
adamc@71 1118 (L'.TFun ((L'.CApp ((L'.CRel 3, loc), (L'.CRel 0, loc)), loc),
adamc@71 1119 (L'.CApp ((L'.CRel 3, loc),
adamc@71 1120 recCons (dom,
adamc@71 1121 (L'.CRel 2, loc),
adamc@71 1122 (L'.CRel 1, loc),
adamc@71 1123 (L'.CRel 0, loc),
adamc@71 1124 loc)), loc)), loc)),
adamc@71 1125 loc)), loc)), loc),
adamc@71 1126 (L'.TFun ((L'.CApp ((L'.CRel 0, loc), (L'.CRecord (dom, []), loc)), loc),
adamc@71 1127 (L'.TCFun (L'.Explicit, "r", (L'.KRecord dom, loc),
adamc@71 1128 (L'.CApp ((L'.CRel 1, loc), (L'.CRel 0, loc)), loc)), loc)),
adamc@71 1129 loc)), loc)), loc)
adamc@71 1130
adamc@228 1131 datatype constraint =
adamc@228 1132 Disjoint of D.goal
adamc@228 1133 | TypeClass of E.env * L'.con * L'.exp option ref * ErrorMsg.span
adamc@228 1134
adamc@228 1135 val enD = map Disjoint
adamc@228 1136
adamc@86 1137 fun elabHead (env, denv) (e as (_, loc)) t =
adamc@15 1138 let
adamc@15 1139 fun unravel (t, e) =
adamc@86 1140 let
adamc@86 1141 val (t, gs) = hnormCon (env, denv) t
adamc@86 1142 in
adamc@86 1143 case t of
adamc@86 1144 (L'.TCFun (L'.Implicit, x, k, t'), _) =>
adamc@86 1145 let
adamc@86 1146 val u = cunif (loc, k)
adamc@86 1147
adamc@86 1148 val (e, t, gs') = unravel (subConInCon (0, u) t',
adamc@86 1149 (L'.ECApp (e, u), loc))
adamc@86 1150 in
adamc@228 1151 (e, t, enD gs @ gs')
adamc@86 1152 end
adamc@228 1153 | _ => (e, t, enD gs)
adamc@86 1154 end
adamc@15 1155 in
adamc@15 1156 unravel (t, e)
adamc@15 1157 end
adamc@15 1158
adamc@174 1159 fun elabPat (pAll as (p, loc), (env, denv, bound)) =
adamc@171 1160 let
adamc@171 1161 val perror = (L'.PWild, loc)
adamc@171 1162 val terror = (L'.CError, loc)
adamc@171 1163 val pterror = (perror, terror)
adamc@171 1164 val rerror = (pterror, (env, bound))
adamc@171 1165
adamc@191 1166 fun pcon (pc, po, xs, to, dn, dk) =
adamc@188 1167 case (po, to) of
adamc@188 1168 (NONE, SOME _) => (expError env (PatHasNoArg loc);
adamc@188 1169 rerror)
adamc@188 1170 | (SOME _, NONE) => (expError env (PatHasArg loc);
adamc@188 1171 rerror)
adamc@191 1172 | (NONE, NONE) =>
adamc@191 1173 let
adamc@191 1174 val k = (L'.KType, loc)
adamc@191 1175 val unifs = map (fn _ => cunif (loc, k)) xs
adamc@191 1176 val dn = foldl (fn (u, dn) => (L'.CApp (dn, u), loc)) dn unifs
adamc@191 1177 in
adamc@191 1178 (((L'.PCon (dk, pc, unifs, NONE), loc), dn),
adamc@191 1179 (env, bound))
adamc@191 1180 end
adamc@188 1181 | (SOME p, SOME t) =>
adamc@188 1182 let
adamc@188 1183 val ((p', pt), (env, bound)) = elabPat (p, (env, denv, bound))
adamc@191 1184
adamc@191 1185 val k = (L'.KType, loc)
adamc@191 1186 val unifs = map (fn _ => cunif (loc, k)) xs
adamc@194 1187 val nxs = length unifs - 1
adamc@194 1188 val t = ListUtil.foldli (fn (i, u, t) => subConInCon (nxs - i, u) t) t unifs
adamc@191 1189 val dn = foldl (fn (u, dn) => (L'.CApp (dn, u), loc)) dn unifs
adamc@188 1190 in
adamc@191 1191 ignore (checkPatCon (env, denv) p' pt t);
adamc@191 1192 (((L'.PCon (dk, pc, unifs, SOME p'), loc), dn),
adamc@188 1193 (env, bound))
adamc@188 1194 end
adamc@171 1195 in
adamc@171 1196 case p of
adamc@171 1197 L.PWild => (((L'.PWild, loc), cunif (loc, (L'.KType, loc))),
adamc@171 1198 (env, bound))
adamc@171 1199 | L.PVar x =>
adamc@171 1200 let
adamc@171 1201 val t = if SS.member (bound, x) then
adamc@171 1202 (expError env (DuplicatePatternVariable (loc, x));
adamc@171 1203 terror)
adamc@171 1204 else
adamc@171 1205 cunif (loc, (L'.KType, loc))
adamc@171 1206 in
adamc@182 1207 (((L'.PVar (x, t), loc), t),
adamc@171 1208 (E.pushERel env x t, SS.add (bound, x)))
adamc@171 1209 end
adamc@173 1210 | L.PPrim p => (((L'.PPrim p, loc), primType env p),
adamc@173 1211 (env, bound))
adamc@171 1212 | L.PCon ([], x, po) =>
adamc@171 1213 (case E.lookupConstructor env x of
adamc@174 1214 NONE => (expError env (UnboundConstructor (loc, [], x));
adamc@171 1215 rerror)
adamc@191 1216 | SOME (dk, n, xs, to, dn) => pcon (L'.PConVar n, po, xs, to, (L'.CNamed dn, loc), dk))
adamc@174 1217 | L.PCon (m1 :: ms, x, po) =>
adamc@174 1218 (case E.lookupStr env m1 of
adamc@174 1219 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@174 1220 rerror)
adamc@174 1221 | SOME (n, sgn) =>
adamc@174 1222 let
adamc@174 1223 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@174 1224 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@182 1225 NONE => raise Fail "elabPat: Unknown substructure"
adamc@174 1226 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@174 1227 ((L'.StrVar n, loc), sgn) ms
adamc@174 1228 in
adamc@174 1229 case E.projectConstructor env {str = str, sgn = sgn, field = x} of
adamc@174 1230 NONE => (expError env (UnboundConstructor (loc, m1 :: ms, x));
adamc@174 1231 rerror)
adamc@191 1232 | SOME (dk, _, xs, to, dn) => pcon (L'.PConProj (n, ms, x), po, xs, to, dn, dk)
adamc@174 1233 end)
adamc@174 1234
adamc@175 1235 | L.PRecord (xps, flex) =>
adamc@175 1236 let
adamc@175 1237 val (xpts, (env, bound, _)) =
adamc@175 1238 ListUtil.foldlMap (fn ((x, p), (env, bound, fbound)) =>
adamc@175 1239 let
adamc@175 1240 val ((p', t), (env, bound)) = elabPat (p, (env, denv, bound))
adamc@175 1241 in
adamc@175 1242 if SS.member (fbound, x) then
adamc@175 1243 expError env (DuplicatePatField (loc, x))
adamc@175 1244 else
adamc@175 1245 ();
adamc@175 1246 ((x, p', t), (env, bound, SS.add (fbound, x)))
adamc@175 1247 end)
adamc@175 1248 (env, bound, SS.empty) xps
adamc@175 1249
adamc@175 1250 val k = (L'.KType, loc)
adamc@175 1251 val c = (L'.CRecord (k, map (fn (x, _, t) => ((L'.CName x, loc), t)) xpts), loc)
adamc@176 1252 val c =
adamc@175 1253 if flex then
adamc@176 1254 (L'.CConcat (c, cunif (loc, (L'.KRecord k, loc))), loc)
adamc@175 1255 else
adamc@176 1256 c
adamc@175 1257 in
adamc@182 1258 (((L'.PRecord xpts, loc),
adamc@175 1259 (L'.TRecord c, loc)),
adamc@175 1260 (env, bound))
adamc@175 1261 end
adamc@175 1262
adamc@171 1263 end
adamc@171 1264
adamc@172 1265 datatype coverage =
adamc@172 1266 Wild
adamc@173 1267 | None
adamc@172 1268 | Datatype of coverage IM.map
adamc@175 1269 | Record of coverage SM.map list
adamc@172 1270
adamc@243 1271 fun c2s c =
adamc@243 1272 case c of
adamc@243 1273 Wild => "Wild"
adamc@243 1274 | None => "None"
adamc@243 1275 | Datatype _ => "Datatype"
adamc@243 1276 | Record _ => "Record"
adamc@243 1277
adamc@172 1278 fun exhaustive (env, denv, t, ps) =
adamc@172 1279 let
adamc@172 1280 fun pcCoverage pc =
adamc@172 1281 case pc of
adamc@172 1282 L'.PConVar n => n
adamc@174 1283 | L'.PConProj (m1, ms, x) =>
adamc@174 1284 let
adamc@174 1285 val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@174 1286 in
adamc@174 1287 case E.projectConstructor env {str = str, sgn = sgn, field = x} of
adamc@174 1288 NONE => raise Fail "exhaustive: Can't project constructor"
adamc@191 1289 | SOME (_, n, _, _, _) => n
adamc@174 1290 end
adamc@172 1291
adamc@172 1292 fun coverage (p, _) =
adamc@172 1293 case p of
adamc@172 1294 L'.PWild => Wild
adamc@172 1295 | L'.PVar _ => Wild
adamc@173 1296 | L'.PPrim _ => None
adamc@191 1297 | L'.PCon (_, pc, _, NONE) => Datatype (IM.insert (IM.empty, pcCoverage pc, Wild))
adamc@191 1298 | L'.PCon (_, pc, _, SOME p) => Datatype (IM.insert (IM.empty, pcCoverage pc, coverage p))
adamc@182 1299 | L'.PRecord xps => Record [foldl (fn ((x, p, _), fmap) =>
adamc@182 1300 SM.insert (fmap, x, coverage p)) SM.empty xps]
adamc@176 1301
adamc@172 1302 fun merge (c1, c2) =
adamc@172 1303 case (c1, c2) of
adamc@173 1304 (None, _) => c2
adamc@173 1305 | (_, None) => c1
adamc@173 1306
adamc@173 1307 | (Wild, _) => Wild
adamc@172 1308 | (_, Wild) => Wild
adamc@172 1309
adamc@172 1310 | (Datatype cm1, Datatype cm2) => Datatype (IM.unionWith merge (cm1, cm2))
adamc@172 1311
adamc@175 1312 | (Record fm1, Record fm2) => Record (fm1 @ fm2)
adamc@175 1313
adamc@175 1314 | _ => None
adamc@175 1315
adamc@172 1316 fun combinedCoverage ps =
adamc@172 1317 case ps of
adamc@172 1318 [] => raise Fail "Empty pattern list for coverage checking"
adamc@172 1319 | [p] => coverage p
adamc@172 1320 | p :: ps => merge (coverage p, combinedCoverage ps)
adamc@172 1321
adamc@175 1322 fun enumerateCases t =
adamc@175 1323 let
adamc@175 1324 fun dtype cons =
adamc@175 1325 ListUtil.mapConcat (fn (_, n, to) =>
adamc@175 1326 case to of
adamc@175 1327 NONE => [Datatype (IM.insert (IM.empty, n, Wild))]
adamc@175 1328 | SOME t => map (fn c => Datatype (IM.insert (IM.empty, n, c)))
adamc@175 1329 (enumerateCases t)) cons
adamc@175 1330 in
adamc@175 1331 case #1 (#1 (hnormCon (env, denv) t)) of
adamc@175 1332 L'.CNamed n =>
adamc@175 1333 (let
adamc@175 1334 val dt = E.lookupDatatype env n
adamc@175 1335 val cons = E.constructors dt
adamc@175 1336 in
adamc@175 1337 dtype cons
adamc@175 1338 end handle E.UnboundNamed _ => [Wild])
adamc@175 1339 | L'.TRecord c =>
adamc@175 1340 (case #1 (#1 (hnormCon (env, denv) c)) of
adamc@175 1341 L'.CRecord (_, xts) =>
adamc@175 1342 let
adamc@175 1343 val xts = map (fn (x, t) => (#1 (hnormCon (env, denv) x), t)) xts
adamc@175 1344
adamc@175 1345 fun exponentiate fs =
adamc@175 1346 case fs of
adamc@175 1347 [] => [SM.empty]
adamc@175 1348 | ((L'.CName x, _), t) :: rest =>
adamc@175 1349 let
adamc@175 1350 val this = enumerateCases t
adamc@175 1351 val rest = exponentiate rest
adamc@175 1352 in
adamc@175 1353 ListUtil.mapConcat (fn fmap =>
adamc@175 1354 map (fn c => SM.insert (fmap, x, c)) this) rest
adamc@175 1355 end
adamc@175 1356 | _ => raise Fail "exponentiate: Not CName"
adamc@175 1357 in
adamc@175 1358 if List.exists (fn ((L'.CName _, _), _) => false
adamc@175 1359 | (c, _) => true) xts then
adamc@175 1360 [Wild]
adamc@175 1361 else
adamc@175 1362 map (fn ls => Record [ls]) (exponentiate xts)
adamc@175 1363 end
adamc@175 1364 | _ => [Wild])
adamc@175 1365 | _ => [Wild]
adamc@175 1366 end
adamc@175 1367
adamc@175 1368 fun coverageImp (c1, c2) =
adamc@243 1369 let
adamc@243 1370 val r =
adamc@243 1371 case (c1, c2) of
adamc@243 1372 (Wild, _) => true
adamc@243 1373
adamc@243 1374 | (Datatype cmap1, Datatype cmap2) =>
adamc@243 1375 List.all (fn (n, c2) =>
adamc@243 1376 case IM.find (cmap1, n) of
adamc@243 1377 NONE => false
adamc@243 1378 | SOME c1 => coverageImp (c1, c2)) (IM.listItemsi cmap2)
adamc@243 1379 | (Datatype cmap1, Wild) =>
adamc@243 1380 List.all (fn (n, c1) => coverageImp (c1, Wild)) (IM.listItemsi cmap1)
adamc@243 1381
adamc@243 1382 | (Record fmaps1, Record fmaps2) =>
adamc@243 1383 List.all (fn fmap2 =>
adamc@243 1384 List.exists (fn fmap1 =>
adamc@243 1385 List.all (fn (x, c2) =>
adamc@243 1386 case SM.find (fmap1, x) of
adamc@243 1387 NONE => true
adamc@243 1388 | SOME c1 => coverageImp (c1, c2))
adamc@243 1389 (SM.listItemsi fmap2))
adamc@243 1390 fmaps1) fmaps2
adamc@243 1391
adamc@243 1392 | (Record fmaps1, Wild) =>
adamc@243 1393 List.exists (fn fmap1 =>
adamc@243 1394 List.all (fn (x, c1) => coverageImp (c1, Wild))
adamc@243 1395 (SM.listItemsi fmap1)) fmaps1
adamc@243 1396
adamc@243 1397 | _ => false
adamc@243 1398 in
adamc@243 1399 (*TextIO.print ("coverageImp(" ^ c2s c1 ^ ", " ^ c2s c2 ^ ") = " ^ Bool.toString r ^ "\n");*)
adamc@243 1400 r
adamc@243 1401 end
adamc@175 1402
adamc@172 1403 fun isTotal (c, t) =
adamc@172 1404 case c of
adamc@173 1405 None => (false, [])
adamc@173 1406 | Wild => (true, [])
adamc@172 1407 | Datatype cm =>
adamc@172 1408 let
adamc@172 1409 val ((t, _), gs) = hnormCon (env, denv) t
adamc@174 1410
adamc@174 1411 fun dtype cons =
adamc@174 1412 foldl (fn ((_, n, to), (total, gs)) =>
adamc@174 1413 case IM.find (cm, n) of
adamc@174 1414 NONE => (false, gs)
adamc@174 1415 | SOME c' =>
adamc@174 1416 case to of
adamc@174 1417 NONE => (total, gs)
adamc@174 1418 | SOME t' =>
adamc@174 1419 let
adamc@174 1420 val (total, gs') = isTotal (c', t')
adamc@174 1421 in
adamc@174 1422 (total, gs' @ gs)
adamc@174 1423 end)
adamc@174 1424 (true, gs) cons
adamc@191 1425
adamc@191 1426 fun unapp t =
adamc@191 1427 case t of
adamc@191 1428 L'.CApp ((t, _), _) => unapp t
adamc@191 1429 | _ => t
adamc@172 1430 in
adamc@191 1431 case unapp t of
adamc@172 1432 L'.CNamed n =>
adamc@172 1433 let
adamc@172 1434 val dt = E.lookupDatatype env n
adamc@172 1435 val cons = E.constructors dt
adamc@172 1436 in
adamc@174 1437 dtype cons
adamc@174 1438 end
adamc@174 1439 | L'.CModProj (m1, ms, x) =>
adamc@174 1440 let
adamc@174 1441 val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@174 1442 in
adamc@174 1443 case E.projectDatatype env {str = str, sgn = sgn, field = x} of
adamc@174 1444 NONE => raise Fail "isTotal: Can't project datatype"
adamc@191 1445 | SOME (_, cons) => dtype cons
adamc@172 1446 end
adamc@172 1447 | L'.CError => (true, gs)
adamc@172 1448 | _ => raise Fail "isTotal: Not a datatype"
adamc@172 1449 end
adamc@175 1450 | Record _ => (List.all (fn c2 => coverageImp (c, c2)) (enumerateCases t), [])
adamc@172 1451 in
adamc@172 1452 isTotal (combinedCoverage ps, t)
adamc@172 1453 end
adamc@172 1454
adamc@217 1455 fun unmodCon env (c, loc) =
adamc@217 1456 case c of
adamc@217 1457 L'.CNamed n =>
adamc@217 1458 (case E.lookupCNamed env n of
adamc@217 1459 (_, _, SOME (c as (L'.CModProj _, _))) => unmodCon env c
adamc@217 1460 | _ => (c, loc))
adamc@217 1461 | L'.CModProj (m1, ms, x) =>
adamc@217 1462 let
adamc@217 1463 val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@217 1464 in
adamc@217 1465 case E.projectCon env {str = str, sgn = sgn, field = x} of
adamc@217 1466 NONE => raise Fail "unmodCon: Can't projectCon"
adamc@217 1467 | SOME (_, SOME (c as (L'.CModProj _, _))) => unmodCon env c
adamc@217 1468 | _ => (c, loc)
adamc@217 1469 end
adamc@217 1470 | _ => (c, loc)
adamc@217 1471
adamc@217 1472 fun normClassConstraint envs (c, loc) =
adamc@217 1473 case c of
adamc@217 1474 L'.CApp (f, x) =>
adamc@217 1475 let
adamc@217 1476 val f = unmodCon (#1 envs) f
adamc@217 1477 val (x, gs) = hnormCon envs x
adamc@217 1478 in
adamc@217 1479 ((L'.CApp (f, x), loc), gs)
adamc@217 1480 end
adamc@217 1481 | _ => ((c, loc), [])
adamc@216 1482
adamc@92 1483 fun elabExp (env, denv) (eAll as (e, loc)) =
adamc@91 1484 let
adamc@92 1485
adamc@92 1486 in
adamc@92 1487 (*eprefaces "elabExp" [("eAll", SourcePrint.p_exp eAll)];*)
adamc@10 1488
adamc@91 1489 case e of
adamc@91 1490 L.EAnnot (e, t) =>
adamc@91 1491 let
adamc@91 1492 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1493 val (t', _, gs2) = elabCon (env, denv) t
adamc@91 1494 val gs3 = checkCon (env, denv) e' et t'
adamc@91 1495 in
adamc@228 1496 (e', t', gs1 @ enD gs2 @ enD gs3)
adamc@91 1497 end
adamc@34 1498
adamc@91 1499 | L.EPrim p => ((L'.EPrim p, loc), primType env p, [])
adamc@91 1500 | L.EVar ([], s) =>
adamc@91 1501 (case E.lookupE env s of
adamc@91 1502 E.NotBound =>
adamc@91 1503 (expError env (UnboundExp (loc, s));
adamc@91 1504 (eerror, cerror, []))
adamc@91 1505 | E.Rel (n, t) => ((L'.ERel n, loc), t, [])
adamc@191 1506 | E.Named (n, t) =>
adamc@191 1507 if Char.isUpper (String.sub (s, 0)) then
adamc@191 1508 elabHead (env, denv) (L'.ENamed n, loc) t
adamc@191 1509 else
adamc@191 1510 ((L'.ENamed n, loc), t, []))
adamc@91 1511 | L.EVar (m1 :: ms, s) =>
adamc@91 1512 (case E.lookupStr env m1 of
adamc@91 1513 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@91 1514 (eerror, cerror, []))
adamc@91 1515 | SOME (n, sgn) =>
adamc@91 1516 let
adamc@91 1517 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@91 1518 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@91 1519 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@91 1520 (strerror, sgnerror))
adamc@91 1521 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@91 1522 ((L'.StrVar n, loc), sgn) ms
adamc@10 1523
adamc@91 1524 val t = case E.projectVal env {sgn = sgn, str = str, field = s} of
adamc@91 1525 NONE => (expError env (UnboundExp (loc, s));
adamc@91 1526 cerror)
adamc@91 1527 | SOME t => t
adamc@91 1528 in
adamc@91 1529 ((L'.EModProj (n, ms, s), loc), t, [])
adamc@91 1530 end)
adamc@86 1531
adamc@211 1532 | L.EApp (e1, (L.EWild, _)) =>
adamc@210 1533 let
adamc@210 1534 val (e1', t1, gs1) = elabExp (env, denv) e1
adamc@210 1535 val (e1', t1, gs2) = elabHead (env, denv) e1' t1
adamc@210 1536 val (t1, gs3) = hnormCon (env, denv) t1
adamc@210 1537 in
adamc@210 1538 case t1 of
adamc@211 1539 (L'.TFun (dom, ran), _) =>
adamc@216 1540 let
adamc@216 1541 val (dom, gs4) = normClassConstraint (env, denv) dom
adamc@216 1542 in
adamc@216 1543 case E.resolveClass env dom of
adamc@228 1544 NONE =>
adamc@228 1545 let
adamc@228 1546 val r = ref NONE
adamc@228 1547 in
adamc@233 1548 ((L'.EApp (e1', (L'.EUnif r, loc)), loc),
adamc@233 1549 ran, [TypeClass (env, dom, r, loc)])
adamc@228 1550 end
adamc@228 1551 | SOME pf => ((L'.EApp (e1', pf), loc), ran, gs1 @ gs2 @ enD gs3 @ enD gs4)
adamc@216 1552 end
adamc@220 1553 | _ => (expError env (OutOfContext (loc, SOME (e1', t1)));
adamc@211 1554 (eerror, cerror, []))
adamc@210 1555 end
adamc@220 1556 | L.EWild => (expError env (OutOfContext (loc, NONE));
adamc@211 1557 (eerror, cerror, []))
adamc@210 1558
adamc@91 1559 | L.EApp (e1, e2) =>
adamc@91 1560 let
adamc@91 1561 val (e1', t1, gs1) = elabExp (env, denv) e1
adamc@91 1562 val (e1', t1, gs2) = elabHead (env, denv) e1' t1
adamc@91 1563 val (e2', t2, gs3) = elabExp (env, denv) e2
adamc@71 1564
adamc@91 1565 val dom = cunif (loc, ktype)
adamc@91 1566 val ran = cunif (loc, ktype)
adamc@91 1567 val t = (L'.TFun (dom, ran), dummy)
adamc@91 1568
adamc@91 1569 val gs4 = checkCon (env, denv) e1' t1 t
adamc@91 1570 val gs5 = checkCon (env, denv) e2' t2 dom
adamc@205 1571
adamc@228 1572 val gs = gs1 @ gs2 @ gs3 @ enD gs4 @ enD gs5
adamc@91 1573 in
adamc@205 1574 ((L'.EApp (e1', e2'), loc), ran, gs)
adamc@91 1575 end
adamc@91 1576 | L.EAbs (x, to, e) =>
adamc@91 1577 let
adamc@91 1578 val (t', gs1) = case to of
adamc@91 1579 NONE => (cunif (loc, ktype), [])
adamc@91 1580 | SOME t =>
adamc@91 1581 let
adamc@91 1582 val (t', tk, gs) = elabCon (env, denv) t
adamc@91 1583 in
adamc@91 1584 checkKind env t' tk ktype;
adamc@91 1585 (t', gs)
adamc@91 1586 end
adamc@91 1587 val (e', et, gs2) = elabExp (E.pushERel env x t', denv) e
adamc@91 1588 in
adamc@91 1589 ((L'.EAbs (x, t', et, e'), loc),
adamc@91 1590 (L'.TFun (t', et), loc),
adamc@228 1591 enD gs1 @ gs2)
adamc@91 1592 end
adamc@91 1593 | L.ECApp (e, c) =>
adamc@91 1594 let
adamc@91 1595 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1596 val (e', et, gs2) = elabHead (env, denv) e' et
adamc@91 1597 val (c', ck, gs3) = elabCon (env, denv) c
adamc@91 1598 val ((et', _), gs4) = hnormCon (env, denv) et
adamc@91 1599 in
adamc@91 1600 case et' of
adamc@91 1601 L'.CError => (eerror, cerror, [])
adamc@91 1602 | L'.TCFun (_, _, k, eb) =>
adamc@91 1603 let
adamc@91 1604 val () = checkKind env c' ck k
adamc@91 1605 val eb' = subConInCon (0, c') eb
adamc@91 1606 handle SynUnif => (expError env (Unif ("substitution", eb));
adamc@91 1607 cerror)
adamc@91 1608 in
adamc@228 1609 ((L'.ECApp (e', c'), loc), eb', gs1 @ gs2 @ enD gs3 @ enD gs4)
adamc@91 1610 end
adamc@91 1611
adamc@91 1612 | L'.CUnif _ =>
adamc@91 1613 (expError env (Unif ("application", et));
adamc@91 1614 (eerror, cerror, []))
adamc@91 1615
adamc@91 1616 | _ =>
adamc@91 1617 (expError env (WrongForm ("constructor function", e', et));
adamc@91 1618 (eerror, cerror, []))
adamc@91 1619 end
adamc@91 1620 | L.ECAbs (expl, x, k, e) =>
adamc@91 1621 let
adamc@91 1622 val expl' = elabExplicitness expl
adamc@91 1623 val k' = elabKind k
adamc@91 1624 val (e', et, gs) = elabExp (E.pushCRel env x k', D.enter denv) e
adamc@91 1625 in
adamc@91 1626 ((L'.ECAbs (expl', x, k', e'), loc),
adamc@91 1627 (L'.TCFun (expl', x, k', et), loc),
adamc@91 1628 gs)
adamc@91 1629 end
adamc@91 1630
adamc@91 1631 | L.EDisjoint (c1, c2, e) =>
adamc@91 1632 let
adamc@91 1633 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@91 1634 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@91 1635
adamc@91 1636 val ku1 = kunif loc
adamc@91 1637 val ku2 = kunif loc
adamc@91 1638
adamc@91 1639 val (denv', gs3) = D.assert env denv (c1', c2')
adamc@91 1640 val (e', t, gs4) = elabExp (env, denv') e
adamc@91 1641 in
adamc@91 1642 checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@91 1643 checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@91 1644
adamc@228 1645 (e', (L'.TDisjoint (c1', c2', t), loc), enD gs1 @ enD gs2 @ enD gs3 @ gs4)
adamc@91 1646 end
adamc@91 1647
adamc@91 1648 | L.ERecord xes =>
adamc@91 1649 let
adamc@91 1650 val (xes', gs) = ListUtil.foldlMap (fn ((x, e), gs) =>
adamc@91 1651 let
adamc@91 1652 val (x', xk, gs1) = elabCon (env, denv) x
adamc@91 1653 val (e', et, gs2) = elabExp (env, denv) e
adamc@91 1654 in
adamc@91 1655 checkKind env x' xk kname;
adamc@228 1656 ((x', e', et), enD gs1 @ gs2 @ gs)
adamc@91 1657 end)
adamc@91 1658 [] xes
adamc@91 1659
adamc@91 1660 val k = (L'.KType, loc)
adamc@91 1661
adamc@91 1662 fun prove (xets, gs) =
adamc@91 1663 case xets of
adamc@91 1664 [] => gs
adamc@91 1665 | (x, _, t) :: rest =>
adamc@91 1666 let
adamc@91 1667 val xc = (x, t)
adamc@91 1668 val r1 = (L'.CRecord (k, [xc]), loc)
adamc@91 1669 val gs = foldl (fn ((x', _, t'), gs) =>
adamc@91 1670 let
adamc@91 1671 val xc' = (x', t')
adamc@91 1672 val r2 = (L'.CRecord (k, [xc']), loc)
adamc@91 1673 in
adamc@91 1674 D.prove env denv (r1, r2, loc) @ gs
adamc@91 1675 end)
adamc@91 1676 gs rest
adamc@91 1677 in
adamc@91 1678 prove (rest, gs)
adamc@91 1679 end
adamc@228 1680
adamc@228 1681 val gsD = List.mapPartial (fn Disjoint d => SOME d | _ => NONE) gs
adamc@228 1682 val gsO = List.filter (fn Disjoint _ => false | _ => true) gs
adamc@91 1683 in
adamc@91 1684 ((L'.ERecord xes', loc),
adamc@91 1685 (L'.TRecord (L'.CRecord (ktype, map (fn (x', _, et) => (x', et)) xes'), loc), loc),
adamc@228 1686 enD (prove (xes', gsD)) @ gsO)
adamc@91 1687 end
adamc@91 1688
adamc@91 1689 | L.EField (e, c) =>
adamc@91 1690 let
adamc@91 1691 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1692 val (c', ck, gs2) = elabCon (env, denv) c
adamc@91 1693
adamc@91 1694 val ft = cunif (loc, ktype)
adamc@91 1695 val rest = cunif (loc, ktype_record)
adamc@91 1696 val first = (L'.CRecord (ktype, [(c', ft)]), loc)
adamc@91 1697
adamc@91 1698 val gs3 =
adamc@91 1699 checkCon (env, denv) e' et
adamc@91 1700 (L'.TRecord (L'.CConcat (first, rest), loc), loc)
adamc@91 1701 val gs4 = D.prove env denv (first, rest, loc)
adamc@91 1702 in
adamc@228 1703 ((L'.EField (e', c', {field = ft, rest = rest}), loc), ft, gs1 @ enD gs2 @ enD gs3 @ enD gs4)
adamc@91 1704 end
adamc@91 1705
adamc@149 1706 | L.ECut (e, c) =>
adamc@149 1707 let
adamc@149 1708 val (e', et, gs1) = elabExp (env, denv) e
adamc@149 1709 val (c', ck, gs2) = elabCon (env, denv) c
adamc@149 1710
adamc@149 1711 val ft = cunif (loc, ktype)
adamc@149 1712 val rest = cunif (loc, ktype_record)
adamc@149 1713 val first = (L'.CRecord (ktype, [(c', ft)]), loc)
adamc@149 1714
adamc@149 1715 val gs3 =
adamc@149 1716 checkCon (env, denv) e' et
adamc@149 1717 (L'.TRecord (L'.CConcat (first, rest), loc), loc)
adamc@149 1718 val gs4 = D.prove env denv (first, rest, loc)
adamc@149 1719 in
adamc@228 1720 ((L'.ECut (e', c', {field = ft, rest = rest}), loc), (L'.TRecord rest, loc),
adamc@228 1721 gs1 @ enD gs2 @ enD gs3 @ enD gs4)
adamc@149 1722 end
adamc@149 1723
adamc@91 1724 | L.EFold =>
adamc@91 1725 let
adamc@91 1726 val dom = kunif loc
adamc@91 1727 in
adamc@91 1728 ((L'.EFold dom, loc), foldType (dom, loc), [])
adamc@91 1729 end
adamc@170 1730
adamc@171 1731 | L.ECase (e, pes) =>
adamc@171 1732 let
adamc@171 1733 val (e', et, gs1) = elabExp (env, denv) e
adamc@171 1734 val result = cunif (loc, (L'.KType, loc))
adamc@171 1735 val (pes', gs) = ListUtil.foldlMap
adamc@171 1736 (fn ((p, e), gs) =>
adamc@171 1737 let
adamc@174 1738 val ((p', pt), (env, _)) = elabPat (p, (env, denv, SS.empty))
adamc@171 1739
adamc@171 1740 val gs1 = checkPatCon (env, denv) p' pt et
adamc@171 1741 val (e', et, gs2) = elabExp (env, denv) e
adamc@171 1742 val gs3 = checkCon (env, denv) e' et result
adamc@171 1743 in
adamc@228 1744 ((p', e'), enD gs1 @ gs2 @ enD gs3 @ gs)
adamc@171 1745 end)
adamc@171 1746 gs1 pes
adamc@172 1747
adamc@172 1748 val (total, gs') = exhaustive (env, denv, et, map #1 pes')
adamc@171 1749 in
adamc@172 1750 if total then
adamc@172 1751 ()
adamc@172 1752 else
adamc@172 1753 expError env (Inexhaustive loc);
adamc@172 1754
adamc@228 1755 ((L'.ECase (e', pes', {disc = et, result = result}), loc), result, enD gs' @ gs)
adamc@171 1756 end
adamc@91 1757 end
adamc@12 1758
adamc@12 1759
adamc@6 1760 datatype decl_error =
adamc@91 1761 KunifsRemain of L'.decl list
adamc@91 1762 | CunifsRemain of L'.decl list
adamc@91 1763
adamc@91 1764 fun lspan [] = ErrorMsg.dummySpan
adamc@91 1765 | lspan ((_, loc) :: _) = loc
adamc@6 1766
adamc@6 1767 fun declError env err =
adamc@6 1768 case err of
adamc@91 1769 KunifsRemain ds =>
adamc@91 1770 (ErrorMsg.errorAt (lspan ds) "Some kind unification variables are undetermined in declaration";
adamc@91 1771 eprefaces' [("Decl", p_list_sep PD.newline (p_decl env) ds)])
adamc@91 1772 | CunifsRemain ds =>
adamc@91 1773 (ErrorMsg.errorAt (lspan ds) "Some constructor unification variables are undetermined in declaration";
adamc@91 1774 eprefaces' [("Decl", p_list_sep PD.newline (p_decl env) ds)])
adamc@6 1775
adamc@31 1776 datatype sgn_error =
adamc@31 1777 UnboundSgn of ErrorMsg.span * string
adamc@31 1778 | UnmatchedSgi of L'.sgn_item
adamc@31 1779 | SgiWrongKind of L'.sgn_item * L'.kind * L'.sgn_item * L'.kind * kunify_error
adamc@31 1780 | SgiWrongCon of L'.sgn_item * L'.con * L'.sgn_item * L'.con * cunify_error
adamc@156 1781 | SgiMismatchedDatatypes of L'.sgn_item * L'.sgn_item * (L'.con * L'.con * cunify_error) option
adamc@41 1782 | SgnWrongForm of L'.sgn * L'.sgn
adamc@42 1783 | UnWhereable of L'.sgn * string
adamc@75 1784 | WhereWrongKind of L'.kind * L'.kind * kunify_error
adamc@58 1785 | NotIncludable of L'.sgn
adamc@62 1786 | DuplicateCon of ErrorMsg.span * string
adamc@62 1787 | DuplicateVal of ErrorMsg.span * string
adamc@62 1788 | DuplicateSgn of ErrorMsg.span * string
adamc@62 1789 | DuplicateStr of ErrorMsg.span * string
adamc@88 1790 | NotConstraintsable of L'.sgn
adamc@31 1791
adamc@31 1792 fun sgnError env err =
adamc@31 1793 case err of
adamc@31 1794 UnboundSgn (loc, s) =>
adamc@31 1795 ErrorMsg.errorAt loc ("Unbound signature variable " ^ s)
adamc@31 1796 | UnmatchedSgi (sgi as (_, loc)) =>
adamc@31 1797 (ErrorMsg.errorAt loc "Unmatched signature item";
adamc@31 1798 eprefaces' [("Item", p_sgn_item env sgi)])
adamc@31 1799 | SgiWrongKind (sgi1, k1, sgi2, k2, kerr) =>
adamc@31 1800 (ErrorMsg.errorAt (#2 sgi1) "Kind unification failure in signature matching:";
adamc@59 1801 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59 1802 ("Need", p_sgn_item env sgi2),
adamc@31 1803 ("Kind 1", p_kind k1),
adamc@31 1804 ("Kind 2", p_kind k2)];
adamc@31 1805 kunifyError kerr)
adamc@31 1806 | SgiWrongCon (sgi1, c1, sgi2, c2, cerr) =>
adamc@31 1807 (ErrorMsg.errorAt (#2 sgi1) "Constructor unification failure in signature matching:";
adamc@59 1808 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59 1809 ("Need", p_sgn_item env sgi2),
adamc@31 1810 ("Con 1", p_con env c1),
adamc@31 1811 ("Con 2", p_con env c2)];
adamc@31 1812 cunifyError env cerr)
adamc@156 1813 | SgiMismatchedDatatypes (sgi1, sgi2, cerro) =>
adamc@156 1814 (ErrorMsg.errorAt (#2 sgi1) "Mismatched 'datatype' specifications:";
adamc@156 1815 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@156 1816 ("Need", p_sgn_item env sgi2)];
adamc@156 1817 Option.app (fn (c1, c2, ue) =>
adamc@156 1818 (eprefaces "Unification error"
adamc@156 1819 [("Con 1", p_con env c1),
adamc@156 1820 ("Con 2", p_con env c2)];
adamc@156 1821 cunifyError env ue)) cerro)
adamc@41 1822 | SgnWrongForm (sgn1, sgn2) =>
adamc@41 1823 (ErrorMsg.errorAt (#2 sgn1) "Incompatible signatures:";
adamc@41 1824 eprefaces' [("Sig 1", p_sgn env sgn1),
adamc@41 1825 ("Sig 2", p_sgn env sgn2)])
adamc@42 1826 | UnWhereable (sgn, x) =>
adamc@42 1827 (ErrorMsg.errorAt (#2 sgn) "Unavailable field for 'where'";
adamc@42 1828 eprefaces' [("Signature", p_sgn env sgn),
adamc@42 1829 ("Field", PD.string x)])
adamc@75 1830 | WhereWrongKind (k1, k2, kerr) =>
adamc@75 1831 (ErrorMsg.errorAt (#2 k1) "Wrong kind for 'where'";
adamc@75 1832 eprefaces' [("Have", p_kind k1),
adamc@75 1833 ("Need", p_kind k2)];
adamc@75 1834 kunifyError kerr)
adamc@58 1835 | NotIncludable sgn =>
adamc@58 1836 (ErrorMsg.errorAt (#2 sgn) "Invalid signature to 'include'";
adamc@58 1837 eprefaces' [("Signature", p_sgn env sgn)])
adamc@62 1838 | DuplicateCon (loc, s) =>
adamc@62 1839 ErrorMsg.errorAt loc ("Duplicate constructor " ^ s ^ " in signature")
adamc@62 1840 | DuplicateVal (loc, s) =>
adamc@62 1841 ErrorMsg.errorAt loc ("Duplicate value " ^ s ^ " in signature")
adamc@62 1842 | DuplicateSgn (loc, s) =>
adamc@62 1843 ErrorMsg.errorAt loc ("Duplicate signature " ^ s ^ " in signature")
adamc@62 1844 | DuplicateStr (loc, s) =>
adamc@62 1845 ErrorMsg.errorAt loc ("Duplicate structure " ^ s ^ " in signature")
adamc@88 1846 | NotConstraintsable sgn =>
adamc@88 1847 (ErrorMsg.errorAt (#2 sgn) "Invalid signature for 'open constraints'";
adamc@88 1848 eprefaces' [("Signature", p_sgn env sgn)])
adamc@31 1849
adamc@31 1850 datatype str_error =
adamc@31 1851 UnboundStr of ErrorMsg.span * string
adamc@44 1852 | NotFunctor of L'.sgn
adamc@46 1853 | FunctorRebind of ErrorMsg.span
adamc@61 1854 | UnOpenable of L'.sgn
adamc@75 1855 | NotType of L'.kind * (L'.kind * L'.kind * kunify_error)
adamc@156 1856 | DuplicateConstructor of string * ErrorMsg.span
adamc@158 1857 | NotDatatype of ErrorMsg.span
adamc@31 1858
adamc@31 1859 fun strError env err =
adamc@31 1860 case err of
adamc@31 1861 UnboundStr (loc, s) =>
adamc@31 1862 ErrorMsg.errorAt loc ("Unbound structure variable " ^ s)
adamc@44 1863 | NotFunctor sgn =>
adamc@44 1864 (ErrorMsg.errorAt (#2 sgn) "Application of non-functor";
adamc@44 1865 eprefaces' [("Signature", p_sgn env sgn)])
adamc@46 1866 | FunctorRebind loc =>
adamc@46 1867 ErrorMsg.errorAt loc "Attempt to rebind functor"
adamc@61 1868 | UnOpenable sgn =>
adamc@61 1869 (ErrorMsg.errorAt (#2 sgn) "Un-openable structure";
adamc@61 1870 eprefaces' [("Signature", p_sgn env sgn)])
adamc@75 1871 | NotType (k, (k1, k2, ue)) =>
adamc@75 1872 (ErrorMsg.errorAt (#2 k) "'val' type kind is not 'Type'";
adamc@75 1873 eprefaces' [("Kind", p_kind k),
adamc@75 1874 ("Subkind 1", p_kind k1),
adamc@75 1875 ("Subkind 2", p_kind k2)];
adamc@75 1876 kunifyError ue)
adamc@156 1877 | DuplicateConstructor (x, loc) =>
adamc@156 1878 ErrorMsg.errorAt loc ("Duplicate datatype constructor " ^ x)
adamc@158 1879 | NotDatatype loc =>
adamc@158 1880 ErrorMsg.errorAt loc "Trying to import non-datatype as a datatype"
adamc@31 1881
adamc@42 1882 val hnormSgn = E.hnormSgn
adamc@31 1883
adamc@210 1884 fun tableOf () = (L'.CModProj (!basis_r, [], "sql_table"), ErrorMsg.dummySpan)
adamc@205 1885
adamc@88 1886 fun elabSgn_item ((sgi, loc), (env, denv, gs)) =
adamc@76 1887 case sgi of
adamc@76 1888 L.SgiConAbs (x, k) =>
adamc@76 1889 let
adamc@76 1890 val k' = elabKind k
adamc@31 1891
adamc@76 1892 val (env', n) = E.pushCNamed env x k' NONE
adamc@76 1893 in
adamc@88 1894 ([(L'.SgiConAbs (x, n, k'), loc)], (env', denv, gs))
adamc@76 1895 end
adamc@31 1896
adamc@76 1897 | L.SgiCon (x, ko, c) =>
adamc@76 1898 let
adamc@76 1899 val k' = case ko of
adamc@76 1900 NONE => kunif loc
adamc@76 1901 | SOME k => elabKind k
adamc@31 1902
adamc@83 1903 val (c', ck, gs') = elabCon (env, denv) c
adamc@76 1904 val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@76 1905 in
adamc@76 1906 checkKind env c' ck k';
adamc@31 1907
adamc@88 1908 ([(L'.SgiCon (x, n, k', c'), loc)], (env', denv, gs' @ gs))
adamc@76 1909 end
adamc@31 1910
adamc@191 1911 | L.SgiDatatype (x, xs, xcs) =>
adamc@157 1912 let
adamc@157 1913 val k = (L'.KType, loc)
adamc@191 1914 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 1915 val (env, n) = E.pushCNamed env x k' NONE
adamc@157 1916 val t = (L'.CNamed n, loc)
adamc@194 1917 val nxs = length xs - 1
adamc@194 1918 val t = ListUtil.foldli (fn (i, _, t) => (L'.CApp (t, (L'.CRel (nxs - i), loc)), loc)) t xs
adamc@157 1919
adamc@157 1920 val (xcs, (used, env, gs)) =
adamc@157 1921 ListUtil.foldlMap
adamc@157 1922 (fn ((x, to), (used, env, gs)) =>
adamc@157 1923 let
adamc@157 1924 val (to, t, gs') = case to of
adamc@157 1925 NONE => (NONE, t, gs)
adamc@157 1926 | SOME t' =>
adamc@157 1927 let
adamc@157 1928 val (t', tk, gs') = elabCon (env, denv) t'
adamc@157 1929 in
adamc@157 1930 checkKind env t' tk k;
adamc@157 1931 (SOME t', (L'.TFun (t', t), loc), gs' @ gs)
adamc@157 1932 end
adamc@191 1933 val t = foldl (fn (x, t) => (L'.TCFun (L'.Implicit, x, k, t), loc)) t xs
adamc@157 1934
adamc@157 1935 val (env, n') = E.pushENamed env x t
adamc@157 1936 in
adamc@157 1937 if SS.member (used, x) then
adamc@157 1938 strError env (DuplicateConstructor (x, loc))
adamc@157 1939 else
adamc@157 1940 ();
adamc@157 1941 ((x, n', to), (SS.add (used, x), env, gs'))
adamc@157 1942 end)
adamc@157 1943 (SS.empty, env, []) xcs
adamc@191 1944
adamc@191 1945 val env = E.pushDatatype env n xs xcs
adamc@157 1946 in
adamc@191 1947 ([(L'.SgiDatatype (x, n, xs, xcs), loc)], (env, denv, gs))
adamc@157 1948 end
adamc@156 1949
adamc@158 1950 | L.SgiDatatypeImp (_, [], _) => raise Fail "Empty SgiDatatypeImp"
adamc@158 1951
adamc@158 1952 | L.SgiDatatypeImp (x, m1 :: ms, s) =>
adamc@158 1953 (case E.lookupStr env m1 of
adamc@158 1954 NONE => (strError env (UnboundStr (loc, m1));
adamc@158 1955 ([], (env, denv, gs)))
adamc@158 1956 | SOME (n, sgn) =>
adamc@158 1957 let
adamc@158 1958 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@158 1959 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@158 1960 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@158 1961 (strerror, sgnerror))
adamc@158 1962 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@158 1963 ((L'.StrVar n, loc), sgn) ms
adamc@158 1964 in
adamc@161 1965 case hnormCon (env, denv) (L'.CModProj (n, ms, s), loc) of
adamc@161 1966 ((L'.CModProj (n, ms, s), _), gs) =>
adamc@161 1967 (case E.projectDatatype env {sgn = sgn, str = str, field = s} of
adamc@161 1968 NONE => (conError env (UnboundDatatype (loc, s));
adamc@161 1969 ([], (env, denv, gs)))
adamc@191 1970 | SOME (xs, xncs) =>
adamc@161 1971 let
adamc@161 1972 val k = (L'.KType, loc)
adamc@191 1973 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 1974
adamc@161 1975 val t = (L'.CModProj (n, ms, s), loc)
adamc@191 1976 val (env, n') = E.pushCNamed env x k' (SOME t)
adamc@191 1977 val env = E.pushDatatype env n' xs xncs
adamc@158 1978
adamc@161 1979 val t = (L'.CNamed n', loc)
adamc@161 1980 val env = foldl (fn ((x, n, to), env) =>
adamc@161 1981 let
adamc@161 1982 val t = case to of
adamc@161 1983 NONE => t
adamc@161 1984 | SOME t' => (L'.TFun (t', t), loc)
adamc@191 1985
adamc@191 1986 val t = foldr (fn (x, t) =>
adamc@191 1987 (L'.TCFun (L'.Implicit, x, k, t), loc))
adamc@191 1988 t xs
adamc@161 1989 in
adamc@161 1990 E.pushENamedAs env x n t
adamc@161 1991 end) env xncs
adamc@161 1992 in
adamc@191 1993 ([(L'.SgiDatatypeImp (x, n', n, ms, s, xs, xncs), loc)], (env, denv, gs))
adamc@161 1994 end)
adamc@161 1995 | _ => (strError env (NotDatatype loc);
adamc@161 1996 ([], (env, denv, [])))
adamc@158 1997 end)
adamc@156 1998
adamc@76 1999 | L.SgiVal (x, c) =>
adamc@76 2000 let
adamc@83 2001 val (c', ck, gs') = elabCon (env, denv) c
adamc@31 2002
adamc@76 2003 val (env', n) = E.pushENamed env x c'
adamc@218 2004 val (c', gs'') = normClassConstraint (env, denv) c'
adamc@76 2005 in
adamc@76 2006 (unifyKinds ck ktype
adamc@76 2007 handle KUnify ue => strError env (NotType (ck, ue)));
adamc@31 2008
adamc@218 2009 ([(L'.SgiVal (x, n, c'), loc)], (env', denv, gs' @ gs'' @ gs))
adamc@76 2010 end
adamc@31 2011
adamc@76 2012 | L.SgiStr (x, sgn) =>
adamc@76 2013 let
adamc@83 2014 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2015 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 2016 in
adamc@88 2017 ([(L'.SgiStr (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 2018 end
adamc@31 2019
adamc@76 2020 | L.SgiSgn (x, sgn) =>
adamc@76 2021 let
adamc@83 2022 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2023 val (env', n) = E.pushSgnNamed env x sgn'
adamc@76 2024 in
adamc@88 2025 ([(L'.SgiSgn (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 2026 end
adamc@31 2027
adamc@76 2028 | L.SgiInclude sgn =>
adamc@76 2029 let
adamc@83 2030 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2031 in
adamc@76 2032 case #1 (hnormSgn env sgn') of
adamc@76 2033 L'.SgnConst sgis =>
adamc@88 2034 (sgis, (foldl (fn (sgi, env) => E.sgiBinds env sgi) env sgis, denv, gs' @ gs))
adamc@76 2035 | _ => (sgnError env (NotIncludable sgn');
adamc@88 2036 ([], (env, denv, [])))
adamc@88 2037 end
adamc@88 2038
adamc@88 2039 | L.SgiConstraint (c1, c2) =>
adamc@88 2040 let
adamc@88 2041 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@88 2042 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@88 2043
adamc@90 2044 val (denv, gs3) = D.assert env denv (c1', c2')
adamc@88 2045 in
adamc@88 2046 checkKind env c1' k1 (L'.KRecord (kunif loc), loc);
adamc@88 2047 checkKind env c2' k2 (L'.KRecord (kunif loc), loc);
adamc@88 2048
adamc@90 2049 ([(L'.SgiConstraint (c1', c2'), loc)], (env, denv, gs1 @ gs2 @ gs3))
adamc@76 2050 end
adamc@31 2051
adamc@203 2052 | L.SgiTable (x, c) =>
adamc@203 2053 let
adamc@203 2054 val (c', k, gs) = elabCon (env, denv) c
adamc@210 2055 val (env, n) = E.pushENamed env x (L'.CApp (tableOf (), c'), loc)
adamc@203 2056 in
adamc@203 2057 checkKind env c' k (L'.KRecord (L'.KType, loc), loc);
adamc@210 2058 ([(L'.SgiTable (!basis_r, x, n, c'), loc)], (env, denv, gs))
adamc@203 2059 end
adamc@203 2060
adamc@211 2061 | L.SgiClassAbs x =>
adamc@211 2062 let
adamc@211 2063 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2064 val (env, n) = E.pushCNamed env x k NONE
adamc@211 2065 val env = E.pushClass env n
adamc@211 2066 in
adamc@211 2067 ([(L'.SgiClassAbs (x, n), loc)], (env, denv, []))
adamc@211 2068 end
adamc@211 2069
adamc@211 2070 | L.SgiClass (x, c) =>
adamc@211 2071 let
adamc@211 2072 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2073 val (c', ck, gs) = elabCon (env, denv) c
adamc@211 2074 val (env, n) = E.pushCNamed env x k (SOME c')
adamc@211 2075 val env = E.pushClass env n
adamc@211 2076 in
adamc@211 2077 checkKind env c' ck k;
adamc@211 2078 ([(L'.SgiClass (x, n, c'), loc)], (env, denv, []))
adamc@211 2079 end
adamc@211 2080
adamc@83 2081 and elabSgn (env, denv) (sgn, loc) =
adamc@31 2082 case sgn of
adamc@31 2083 L.SgnConst sgis =>
adamc@31 2084 let
adamc@88 2085 val (sgis', (_, _, gs)) = ListUtil.foldlMapConcat elabSgn_item (env, denv, []) sgis
adamc@62 2086
adamc@62 2087 val _ = foldl (fn ((sgi, loc), (cons, vals, sgns, strs)) =>
adamc@62 2088 case sgi of
adamc@62 2089 L'.SgiConAbs (x, _, _) =>
adamc@62 2090 (if SS.member (cons, x) then
adamc@62 2091 sgnError env (DuplicateCon (loc, x))
adamc@62 2092 else
adamc@62 2093 ();
adamc@62 2094 (SS.add (cons, x), vals, sgns, strs))
adamc@62 2095 | L'.SgiCon (x, _, _, _) =>
adamc@62 2096 (if SS.member (cons, x) then
adamc@62 2097 sgnError env (DuplicateCon (loc, x))
adamc@62 2098 else
adamc@62 2099 ();
adamc@62 2100 (SS.add (cons, x), vals, sgns, strs))
adamc@191 2101 | L'.SgiDatatype (x, _, _, xncs) =>
adamc@156 2102 let
adamc@156 2103 val vals = foldl (fn ((x, _, _), vals) =>
adamc@156 2104 (if SS.member (vals, x) then
adamc@156 2105 sgnError env (DuplicateVal (loc, x))
adamc@156 2106 else
adamc@156 2107 ();
adamc@156 2108 SS.add (vals, x)))
adamc@156 2109 vals xncs
adamc@156 2110 in
adamc@156 2111 if SS.member (cons, x) then
adamc@156 2112 sgnError env (DuplicateCon (loc, x))
adamc@156 2113 else
adamc@156 2114 ();
adamc@156 2115 (SS.add (cons, x), vals, sgns, strs)
adamc@156 2116 end
adamc@191 2117 | L'.SgiDatatypeImp (x, _, _, _, _, _, _) =>
adamc@156 2118 (if SS.member (cons, x) then
adamc@156 2119 sgnError env (DuplicateCon (loc, x))
adamc@156 2120 else
adamc@156 2121 ();
adamc@156 2122 (SS.add (cons, x), vals, sgns, strs))
adamc@62 2123 | L'.SgiVal (x, _, _) =>
adamc@62 2124 (if SS.member (vals, x) then
adamc@62 2125 sgnError env (DuplicateVal (loc, x))
adamc@62 2126 else
adamc@62 2127 ();
adamc@62 2128 (cons, SS.add (vals, x), sgns, strs))
adamc@62 2129 | L'.SgiSgn (x, _, _) =>
adamc@62 2130 (if SS.member (sgns, x) then
adamc@62 2131 sgnError env (DuplicateSgn (loc, x))
adamc@62 2132 else
adamc@62 2133 ();
adamc@62 2134 (cons, vals, SS.add (sgns, x), strs))
adamc@62 2135 | L'.SgiStr (x, _, _) =>
adamc@62 2136 (if SS.member (strs, x) then
adamc@62 2137 sgnError env (DuplicateStr (loc, x))
adamc@62 2138 else
adamc@62 2139 ();
adamc@88 2140 (cons, vals, sgns, SS.add (strs, x)))
adamc@203 2141 | L'.SgiConstraint _ => (cons, vals, sgns, strs)
adamc@205 2142 | L'.SgiTable (_, x, _, _) =>
adamc@203 2143 (if SS.member (vals, x) then
adamc@203 2144 sgnError env (DuplicateVal (loc, x))
adamc@203 2145 else
adamc@203 2146 ();
adamc@211 2147 (cons, SS.add (vals, x), sgns, strs))
adamc@211 2148 | L'.SgiClassAbs (x, _) =>
adamc@211 2149 (if SS.member (cons, x) then
adamc@211 2150 sgnError env (DuplicateCon (loc, x))
adamc@211 2151 else
adamc@211 2152 ();
adamc@211 2153 (SS.add (cons, x), vals, sgns, strs))
adamc@211 2154 | L'.SgiClass (x, _, _) =>
adamc@211 2155 (if SS.member (cons, x) then
adamc@211 2156 sgnError env (DuplicateCon (loc, x))
adamc@211 2157 else
adamc@211 2158 ();
adamc@211 2159 (SS.add (cons, x), vals, sgns, strs)))
adamc@62 2160 (SS.empty, SS.empty, SS.empty, SS.empty) sgis'
adamc@31 2161 in
adamc@83 2162 ((L'.SgnConst sgis', loc), gs)
adamc@31 2163 end
adamc@31 2164 | L.SgnVar x =>
adamc@31 2165 (case E.lookupSgn env x of
adamc@31 2166 NONE =>
adamc@31 2167 (sgnError env (UnboundSgn (loc, x));
adamc@83 2168 ((L'.SgnError, loc), []))
adamc@83 2169 | SOME (n, sgis) => ((L'.SgnVar n, loc), []))
adamc@41 2170 | L.SgnFun (m, dom, ran) =>
adamc@41 2171 let
adamc@83 2172 val (dom', gs1) = elabSgn (env, denv) dom
adamc@41 2173 val (env', n) = E.pushStrNamed env m dom'
adamc@83 2174 val (ran', gs2) = elabSgn (env', denv) ran
adamc@41 2175 in
adamc@83 2176 ((L'.SgnFun (m, n, dom', ran'), loc), gs1 @ gs2)
adamc@41 2177 end
adamc@42 2178 | L.SgnWhere (sgn, x, c) =>
adamc@42 2179 let
adamc@83 2180 val (sgn', ds1) = elabSgn (env, denv) sgn
adamc@83 2181 val (c', ck, ds2) = elabCon (env, denv) c
adamc@42 2182 in
adamc@42 2183 case #1 (hnormSgn env sgn') of
adamc@83 2184 L'.SgnError => (sgnerror, [])
adamc@42 2185 | L'.SgnConst sgis =>
adamc@75 2186 if List.exists (fn (L'.SgiConAbs (x', _, k), _) =>
adamc@75 2187 x' = x andalso
adamc@75 2188 (unifyKinds k ck
adamc@75 2189 handle KUnify x => sgnError env (WhereWrongKind x);
adamc@42 2190 true)
adamc@42 2191 | _ => false) sgis then
adamc@83 2192 ((L'.SgnWhere (sgn', x, c'), loc), ds1 @ ds2)
adamc@42 2193 else
adamc@42 2194 (sgnError env (UnWhereable (sgn', x));
adamc@83 2195 (sgnerror, []))
adamc@42 2196 | _ => (sgnError env (UnWhereable (sgn', x));
adamc@83 2197 (sgnerror, []))
adamc@42 2198 end
adamc@59 2199 | L.SgnProj (m, ms, x) =>
adamc@59 2200 (case E.lookupStr env m of
adamc@59 2201 NONE => (strError env (UnboundStr (loc, m));
adamc@83 2202 (sgnerror, []))
adamc@59 2203 | SOME (n, sgn) =>
adamc@59 2204 let
adamc@59 2205 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@59 2206 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@59 2207 NONE => (strError env (UnboundStr (loc, m));
adamc@59 2208 (strerror, sgnerror))
adamc@59 2209 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@59 2210 ((L'.StrVar n, loc), sgn) ms
adamc@59 2211 in
adamc@59 2212 case E.projectSgn env {sgn = sgn, str = str, field = x} of
adamc@59 2213 NONE => (sgnError env (UnboundSgn (loc, x));
adamc@83 2214 (sgnerror, []))
adamc@83 2215 | SOME _ => ((L'.SgnProj (n, ms, x), loc), [])
adamc@59 2216 end)
adamc@59 2217
adamc@31 2218
adamc@66 2219 fun selfify env {str, strs, sgn} =
adamc@66 2220 case #1 (hnormSgn env sgn) of
adamc@66 2221 L'.SgnError => sgn
adamc@66 2222 | L'.SgnVar _ => sgn
adamc@66 2223
adamc@66 2224 | L'.SgnConst sgis =>
adamc@66 2225 (L'.SgnConst (map (fn (L'.SgiConAbs (x, n, k), loc) =>
adamc@66 2226 (L'.SgiCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc)
adamc@191 2227 | (L'.SgiDatatype (x, n, xs, xncs), loc) =>
adamc@191 2228 (L'.SgiDatatypeImp (x, n, str, strs, x, xs, xncs), loc)
adamc@218 2229 | (L'.SgiClassAbs (x, n), loc) =>
adamc@218 2230 (L'.SgiClass (x, n, (L'.CModProj (str, strs, x), loc)), loc)
adamc@66 2231 | (L'.SgiStr (x, n, sgn), loc) =>
adamc@66 2232 (L'.SgiStr (x, n, selfify env {str = str, strs = strs @ [x], sgn = sgn}), loc)
adamc@66 2233 | x => x) sgis), #2 sgn)
adamc@66 2234 | L'.SgnFun _ => sgn
adamc@66 2235 | L'.SgnWhere _ => sgn
adamc@66 2236 | L'.SgnProj (m, ms, x) =>
adamc@66 2237 case E.projectSgn env {str = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66 2238 (L'.StrVar m, #2 sgn) ms,
adamc@66 2239 sgn = #2 (E.lookupStrNamed env m),
adamc@66 2240 field = x} of
adamc@66 2241 NONE => raise Fail "Elaborate.selfify: projectSgn returns NONE"
adamc@66 2242 | SOME sgn => selfify env {str = str, strs = strs, sgn = sgn}
adamc@66 2243
adamc@66 2244 fun selfifyAt env {str, sgn} =
adamc@66 2245 let
adamc@66 2246 fun self (str, _) =
adamc@66 2247 case str of
adamc@66 2248 L'.StrVar x => SOME (x, [])
adamc@66 2249 | L'.StrProj (str, x) =>
adamc@66 2250 (case self str of
adamc@66 2251 NONE => NONE
adamc@66 2252 | SOME (m, ms) => SOME (m, ms @ [x]))
adamc@66 2253 | _ => NONE
adamc@66 2254 in
adamc@66 2255 case self str of
adamc@66 2256 NONE => sgn
adamc@66 2257 | SOME (str, strs) => selfify env {sgn = sgn, str = str, strs = strs}
adamc@66 2258 end
adamc@66 2259
adamc@88 2260 fun dopen (env, denv) {str, strs, sgn} =
adamc@66 2261 let
adamc@66 2262 val m = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66 2263 (L'.StrVar str, #2 sgn) strs
adamc@66 2264 in
adamc@66 2265 case #1 (hnormSgn env sgn) of
adamc@66 2266 L'.SgnConst sgis =>
adamc@88 2267 ListUtil.foldlMap (fn ((sgi, loc), (env', denv')) =>
adamc@162 2268 let
adamc@162 2269 val d =
adamc@162 2270 case sgi of
adamc@162 2271 L'.SgiConAbs (x, n, k) =>
adamc@162 2272 let
adamc@162 2273 val c = (L'.CModProj (str, strs, x), loc)
adamc@162 2274 in
adamc@162 2275 (L'.DCon (x, n, k, c), loc)
adamc@162 2276 end
adamc@162 2277 | L'.SgiCon (x, n, k, c) =>
adamc@162 2278 (L'.DCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc)
adamc@191 2279 | L'.SgiDatatype (x, n, xs, xncs) =>
adamc@191 2280 (L'.DDatatypeImp (x, n, str, strs, x, xs, xncs), loc)
adamc@191 2281 | L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs) =>
adamc@191 2282 (L'.DDatatypeImp (x, n, m1, ms, x', xs, xncs), loc)
adamc@162 2283 | L'.SgiVal (x, n, t) =>
adamc@162 2284 (L'.DVal (x, n, t, (L'.EModProj (str, strs, x), loc)), loc)
adamc@162 2285 | L'.SgiStr (x, n, sgn) =>
adamc@162 2286 (L'.DStr (x, n, sgn, (L'.StrProj (m, x), loc)), loc)
adamc@162 2287 | L'.SgiSgn (x, n, sgn) =>
adamc@162 2288 (L'.DSgn (x, n, (L'.SgnProj (str, strs, x), loc)), loc)
adamc@162 2289 | L'.SgiConstraint (c1, c2) =>
adamc@162 2290 (L'.DConstraint (c1, c2), loc)
adamc@205 2291 | L'.SgiTable (_, x, n, c) =>
adamc@210 2292 (L'.DVal (x, n, (L'.CApp (tableOf (), c), loc),
adamc@203 2293 (L'.EModProj (str, strs, x), loc)), loc)
adamc@211 2294 | L'.SgiClassAbs (x, n) =>
adamc@211 2295 let
adamc@211 2296 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2297 val c = (L'.CModProj (str, strs, x), loc)
adamc@211 2298 in
adamc@211 2299 (L'.DCon (x, n, k, c), loc)
adamc@211 2300 end
adamc@211 2301 | L'.SgiClass (x, n, _) =>
adamc@211 2302 let
adamc@211 2303 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2304 val c = (L'.CModProj (str, strs, x), loc)
adamc@211 2305 in
adamc@211 2306 (L'.DCon (x, n, k, c), loc)
adamc@211 2307 end
adamc@162 2308 in
adamc@162 2309 (d, (E.declBinds env' d, denv'))
adamc@162 2310 end)
adamc@88 2311 (env, denv) sgis
adamc@66 2312 | _ => (strError env (UnOpenable sgn);
adamc@88 2313 ([], (env, denv)))
adamc@66 2314 end
adamc@66 2315
adamc@88 2316 fun dopenConstraints (loc, env, denv) {str, strs} =
adamc@88 2317 case E.lookupStr env str of
adamc@88 2318 NONE => (strError env (UnboundStr (loc, str));
adamc@88 2319 denv)
adamc@88 2320 | SOME (n, sgn) =>
adamc@88 2321 let
adamc@88 2322 val (st, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@88 2323 case E.projectStr env {str = str, sgn = sgn, field = m} of
adamc@88 2324 NONE => (strError env (UnboundStr (loc, m));
adamc@88 2325 (strerror, sgnerror))
adamc@88 2326 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@88 2327 ((L'.StrVar n, loc), sgn) strs
adamc@88 2328
adamc@88 2329 val cso = E.projectConstraints env {sgn = sgn, str = st}
adamc@88 2330
adamc@88 2331 val denv = case cso of
adamc@88 2332 NONE => (strError env (UnboundStr (loc, str));
adamc@88 2333 denv)
adamc@90 2334 | SOME cs => foldl (fn ((c1, c2), denv) =>
adamc@90 2335 let
adamc@90 2336 val (denv, gs) = D.assert env denv (c1, c2)
adamc@90 2337 in
adamc@90 2338 case gs of
adamc@90 2339 [] => ()
adamc@90 2340 | _ => raise Fail "dopenConstraints: Sub-constraints remain";
adamc@90 2341
adamc@90 2342 denv
adamc@90 2343 end) denv cs
adamc@88 2344 in
adamc@88 2345 denv
adamc@88 2346 end
adamc@88 2347
adamc@31 2348 fun sgiOfDecl (d, loc) =
adamc@31 2349 case d of
adamc@123 2350 L'.DCon (x, n, k, c) => [(L'.SgiCon (x, n, k, c), loc)]
adamc@156 2351 | L'.DDatatype x => [(L'.SgiDatatype x, loc)]
adamc@156 2352 | L'.DDatatypeImp x => [(L'.SgiDatatypeImp x, loc)]
adamc@123 2353 | L'.DVal (x, n, t, _) => [(L'.SgiVal (x, n, t), loc)]
adamc@123 2354 | L'.DValRec vis => map (fn (x, n, t, _) => (L'.SgiVal (x, n, t), loc)) vis
adamc@123 2355 | L'.DSgn (x, n, sgn) => [(L'.SgiSgn (x, n, sgn), loc)]
adamc@123 2356 | L'.DStr (x, n, sgn, _) => [(L'.SgiStr (x, n, sgn), loc)]
adamc@123 2357 | L'.DFfiStr (x, n, sgn) => [(L'.SgiStr (x, n, sgn), loc)]
adamc@123 2358 | L'.DConstraint cs => [(L'.SgiConstraint cs, loc)]
adamc@123 2359 | L'.DExport _ => []
adamc@205 2360 | L'.DTable (tn, x, n, c) => [(L'.SgiTable (tn, x, n, c), loc)]
adamc@213 2361 | L'.DClass (x, n, c) => [(L'.SgiClass (x, n, c), loc)]
adamc@88 2362
adamc@88 2363 fun sgiBindsD (env, denv) (sgi, _) =
adamc@88 2364 case sgi of
adamc@90 2365 L'.SgiConstraint (c1, c2) =>
adamc@90 2366 (case D.assert env denv (c1, c2) of
adamc@90 2367 (denv, []) => denv
adamc@90 2368 | _ => raise Fail "sgiBindsD: Sub-constraints remain")
adamc@88 2369 | _ => denv
adamc@31 2370
adamc@86 2371 fun subSgn (env, denv) sgn1 (sgn2 as (_, loc2)) =
adamc@35 2372 case (#1 (hnormSgn env sgn1), #1 (hnormSgn env sgn2)) of
adamc@31 2373 (L'.SgnError, _) => ()
adamc@31 2374 | (_, L'.SgnError) => ()
adamc@31 2375
adamc@31 2376 | (L'.SgnConst sgis1, L'.SgnConst sgis2) =>
adamc@31 2377 let
adamc@156 2378 fun folder (sgi2All as (sgi, loc), (env, denv)) =
adamc@31 2379 let
adamc@31 2380 fun seek p =
adamc@31 2381 let
adamc@88 2382 fun seek (env, denv) ls =
adamc@31 2383 case ls of
adamc@31 2384 [] => (sgnError env (UnmatchedSgi sgi2All);
adamc@88 2385 (env, denv))
adamc@31 2386 | h :: t =>
adamc@31 2387 case p h of
adamc@88 2388 NONE => seek (E.sgiBinds env h, sgiBindsD (env, denv) h) t
adamc@88 2389 | SOME envs => envs
adamc@31 2390 in
adamc@88 2391 seek (env, denv) sgis1
adamc@31 2392 end
adamc@31 2393 in
adamc@31 2394 case sgi of
adamc@31 2395 L'.SgiConAbs (x, n2, k2) =>
adamc@31 2396 seek (fn sgi1All as (sgi1, _) =>
adamc@31 2397 let
adamc@41 2398 fun found (x', n1, k1, co1) =
adamc@41 2399 if x = x' then
adamc@41 2400 let
adamc@41 2401 val () = unifyKinds k1 k2
adamc@41 2402 handle KUnify (k1, k2, err) =>
adamc@41 2403 sgnError env (SgiWrongKind (sgi1All, k1, sgi2All, k2, err))
adamc@41 2404 val env = E.pushCNamedAs env x n1 k1 co1
adamc@41 2405 in
adamc@41 2406 SOME (if n1 = n2 then
adamc@41 2407 env
adamc@41 2408 else
adamc@88 2409 E.pushCNamedAs env x n2 k2 (SOME (L'.CNamed n1, loc2)),
adamc@88 2410 denv)
adamc@41 2411 end
adamc@41 2412 else
adamc@41 2413 NONE
adamc@31 2414 in
adamc@31 2415 case sgi1 of
adamc@41 2416 L'.SgiConAbs (x', n1, k1) => found (x', n1, k1, NONE)
adamc@41 2417 | L'.SgiCon (x', n1, k1, c1) => found (x', n1, k1, SOME c1)
adamc@191 2418 | L'.SgiDatatype (x', n1, xs, _) =>
adamc@191 2419 let
adamc@191 2420 val k = (L'.KType, loc)
adamc@191 2421 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 2422 in
adamc@191 2423 found (x', n1, k', NONE)
adamc@191 2424 end
adamc@191 2425 | L'.SgiDatatypeImp (x', n1, m1, ms, s, xs, _) =>
adamc@191 2426 let
adamc@191 2427 val k = (L'.KType, loc)
adamc@191 2428 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 2429 in
adamc@191 2430 found (x', n1, k', SOME (L'.CModProj (m1, ms, s), loc))
adamc@191 2431 end
adamc@211 2432 | L'.SgiClassAbs (x', n1) => found (x', n1,
adamc@218 2433 (L'.KArrow ((L'.KType, loc),
adamc@218 2434 (L'.KType, loc)), loc),
adamc@218 2435 NONE)
adamc@211 2436 | L'.SgiClass (x', n1, c) => found (x', n1,
adamc@211 2437 (L'.KArrow ((L'.KType, loc),
adamc@211 2438 (L'.KType, loc)), loc),
adamc@211 2439 SOME c)
adamc@31 2440 | _ => NONE
adamc@31 2441 end)
adamc@31 2442
adamc@31 2443 | L'.SgiCon (x, n2, k2, c2) =>
adamc@31 2444 seek (fn sgi1All as (sgi1, _) =>
adamc@211 2445 let
adamc@211 2446 fun found (x', n1, k1, c1) =
adamc@211 2447 if x = x' then
adamc@211 2448 let
adamc@211 2449 fun good () = SOME (E.pushCNamedAs env x n2 k2 (SOME c2), denv)
adamc@211 2450 in
adamc@211 2451 (case unifyCons (env, denv) c1 c2 of
adamc@211 2452 [] => good ()
adamc@211 2453 | _ => NONE)
adamc@211 2454 handle CUnify (c1, c2, err) =>
adamc@211 2455 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@211 2456 good ())
adamc@211 2457 end
adamc@211 2458 else
adamc@211 2459 NONE
adamc@211 2460 in
adamc@211 2461 case sgi1 of
adamc@211 2462 L'.SgiCon (x', n1, k1, c1) => found (x', n1, k1, c1)
adamc@211 2463 | L'.SgiClass (x', n1, c1) =>
adamc@211 2464 found (x', n1, (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc), c1)
adamc@211 2465 | _ => NONE
adamc@211 2466 end)
adamc@31 2467
adamc@191 2468 | L'.SgiDatatype (x, n2, xs2, xncs2) =>
adamc@156 2469 seek (fn sgi1All as (sgi1, _) =>
adamc@160 2470 let
adamc@191 2471 fun found (n1, xs1, xncs1) =
adamc@160 2472 let
adamc@160 2473 fun mismatched ue =
adamc@160 2474 (sgnError env (SgiMismatchedDatatypes (sgi1All, sgi2All, ue));
adamc@160 2475 SOME (env, denv))
adamc@156 2476
adamc@191 2477 val k = (L'.KType, loc)
adamc@191 2478 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs1
adamc@191 2479
adamc@160 2480 fun good () =
adamc@160 2481 let
adamc@160 2482 val env = E.sgiBinds env sgi2All
adamc@160 2483 val env = if n1 = n2 then
adamc@160 2484 env
adamc@160 2485 else
adamc@160 2486 E.pushCNamedAs env x n1 (L'.KType, loc)
adamc@160 2487 (SOME (L'.CNamed n1, loc))
adamc@160 2488 in
adamc@160 2489 SOME (env, denv)
adamc@160 2490 end
adamc@156 2491
adamc@191 2492 val env = foldl (fn (x, env) => E.pushCRel env x k) env xs1
adamc@160 2493 fun xncBad ((x1, _, t1), (x2, _, t2)) =
adamc@160 2494 String.compare (x1, x2) <> EQUAL
adamc@160 2495 orelse case (t1, t2) of
adamc@160 2496 (NONE, NONE) => false
adamc@160 2497 | (SOME t1, SOME t2) =>
adamc@160 2498 not (List.null (unifyCons (env, denv) t1 t2))
adamc@160 2499 | _ => true
adamc@160 2500 in
adamc@191 2501 (if xs1 <> xs2
adamc@191 2502 orelse length xncs1 <> length xncs2
adamc@160 2503 orelse ListPair.exists xncBad (xncs1, xncs2) then
adamc@160 2504 mismatched NONE
adamc@160 2505 else
adamc@160 2506 good ())
adamc@160 2507 handle CUnify ue => mismatched (SOME ue)
adamc@160 2508 end
adamc@160 2509 in
adamc@160 2510 case sgi1 of
adamc@191 2511 L'.SgiDatatype (x', n1, xs, xncs1) =>
adamc@160 2512 if x' = x then
adamc@191 2513 found (n1, xs, xncs1)
adamc@160 2514 else
adamc@160 2515 NONE
adamc@191 2516 | L'.SgiDatatypeImp (x', n1, _, _, _, xs, xncs1) =>
adamc@162 2517 if x' = x then
adamc@191 2518 found (n1, xs, xncs1)
adamc@162 2519 else
adamc@162 2520 NONE
adamc@160 2521 | _ => NONE
adamc@160 2522 end)
adamc@156 2523
adamc@191 2524 | L'.SgiDatatypeImp (x, n2, m12, ms2, s2, xs, _) =>
adamc@158 2525 seek (fn sgi1All as (sgi1, _) =>
adamc@158 2526 case sgi1 of
adamc@191 2527 L'.SgiDatatypeImp (x', n1, m11, ms1, s1, _, _) =>
adamc@158 2528 if x = x' then
adamc@158 2529 let
adamc@158 2530 val k = (L'.KType, loc)
adamc@191 2531 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@158 2532 val t1 = (L'.CModProj (m11, ms1, s1), loc)
adamc@158 2533 val t2 = (L'.CModProj (m12, ms2, s2), loc)
adamc@158 2534
adamc@158 2535 fun good () =
adamc@158 2536 let
adamc@191 2537 val env = E.pushCNamedAs env x n1 k' (SOME t1)
adamc@191 2538 val env = E.pushCNamedAs env x n2 k' (SOME t2)
adamc@158 2539 in
adamc@158 2540 SOME (env, denv)
adamc@158 2541 end
adamc@158 2542 in
adamc@158 2543 (case unifyCons (env, denv) t1 t2 of
adamc@158 2544 [] => good ()
adamc@158 2545 | _ => NONE)
adamc@158 2546 handle CUnify (c1, c2, err) =>
adamc@158 2547 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@158 2548 good ())
adamc@158 2549 end
adamc@158 2550 else
adamc@158 2551 NONE
adamc@158 2552
adamc@158 2553 | _ => NONE)
adamc@156 2554
adamc@32 2555 | L'.SgiVal (x, n2, c2) =>
adamc@32 2556 seek (fn sgi1All as (sgi1, _) =>
adamc@32 2557 case sgi1 of
adamc@41 2558 L'.SgiVal (x', n1, c1) =>
adamc@41 2559 if x = x' then
adamc@86 2560 (case unifyCons (env, denv) c1 c2 of
adamc@88 2561 [] => SOME (env, denv)
adamc@86 2562 | _ => NONE)
adamc@86 2563 handle CUnify (c1, c2, err) =>
adamc@86 2564 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@88 2565 SOME (env, denv))
adamc@41 2566 else
adamc@41 2567 NONE
adamc@205 2568 | L'.SgiTable (_, x', n1, c1) =>
adamc@203 2569 if x = x' then
adamc@210 2570 (case unifyCons (env, denv) (L'.CApp (tableOf (), c1), loc) c2 of
adamc@203 2571 [] => SOME (env, denv)
adamc@203 2572 | _ => NONE)
adamc@203 2573 handle CUnify (c1, c2, err) =>
adamc@203 2574 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@203 2575 SOME (env, denv))
adamc@203 2576 else
adamc@203 2577 NONE
adamc@32 2578 | _ => NONE)
adamc@32 2579
adamc@33 2580 | L'.SgiStr (x, n2, sgn2) =>
adamc@33 2581 seek (fn sgi1All as (sgi1, _) =>
adamc@33 2582 case sgi1 of
adamc@41 2583 L'.SgiStr (x', n1, sgn1) =>
adamc@41 2584 if x = x' then
adamc@66 2585 let
adamc@86 2586 val () = subSgn (env, denv) sgn1 sgn2
adamc@66 2587 val env = E.pushStrNamedAs env x n1 sgn1
adamc@66 2588 val env = if n1 = n2 then
adamc@66 2589 env
adamc@66 2590 else
adamc@66 2591 E.pushStrNamedAs env x n2
adamc@66 2592 (selfifyAt env {str = (L'.StrVar n1, #2 sgn2),
adamc@66 2593 sgn = sgn2})
adamc@66 2594 in
adamc@88 2595 SOME (env, denv)
adamc@66 2596 end
adamc@41 2597 else
adamc@41 2598 NONE
adamc@33 2599 | _ => NONE)
adamc@59 2600
adamc@59 2601 | L'.SgiSgn (x, n2, sgn2) =>
adamc@59 2602 seek (fn sgi1All as (sgi1, _) =>
adamc@59 2603 case sgi1 of
adamc@59 2604 L'.SgiSgn (x', n1, sgn1) =>
adamc@59 2605 if x = x' then
adamc@65 2606 let
adamc@86 2607 val () = subSgn (env, denv) sgn1 sgn2
adamc@86 2608 val () = subSgn (env, denv) sgn2 sgn1
adamc@65 2609
adamc@65 2610 val env = E.pushSgnNamedAs env x n2 sgn2
adamc@65 2611 val env = if n1 = n2 then
adamc@65 2612 env
adamc@65 2613 else
adamc@65 2614 E.pushSgnNamedAs env x n1 sgn2
adamc@65 2615 in
adamc@88 2616 SOME (env, denv)
adamc@65 2617 end
adamc@59 2618 else
adamc@59 2619 NONE
adamc@59 2620 | _ => NONE)
adamc@88 2621
adamc@88 2622 | L'.SgiConstraint (c2, d2) =>
adamc@88 2623 seek (fn sgi1All as (sgi1, _) =>
adamc@88 2624 case sgi1 of
adamc@88 2625 L'.SgiConstraint (c1, d1) =>
adamc@88 2626 if consEq (env, denv) (c1, c2) andalso consEq (env, denv) (d1, d2) then
adamc@90 2627 let
adamc@90 2628 val (denv, gs) = D.assert env denv (c2, d2)
adamc@90 2629 in
adamc@90 2630 case gs of
adamc@90 2631 [] => ()
adamc@90 2632 | _ => raise Fail "subSgn: Sub-constraints remain";
adamc@90 2633
adamc@90 2634 SOME (env, denv)
adamc@90 2635 end
adamc@88 2636 else
adamc@88 2637 NONE
adamc@88 2638 | _ => NONE)
adamc@203 2639
adamc@205 2640 | L'.SgiTable (_, x, n2, c2) =>
adamc@203 2641 seek (fn sgi1All as (sgi1, _) =>
adamc@203 2642 case sgi1 of
adamc@205 2643 L'.SgiTable (_, x', n1, c1) =>
adamc@203 2644 if x = x' then
adamc@203 2645 (case unifyCons (env, denv) c1 c2 of
adamc@203 2646 [] => SOME (env, denv)
adamc@203 2647 | _ => NONE)
adamc@203 2648 handle CUnify (c1, c2, err) =>
adamc@203 2649 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@203 2650 SOME (env, denv))
adamc@203 2651 else
adamc@203 2652 NONE
adamc@203 2653 | _ => NONE)
adamc@211 2654
adamc@211 2655 | L'.SgiClassAbs (x, n2) =>
adamc@211 2656 seek (fn sgi1All as (sgi1, _) =>
adamc@211 2657 let
adamc@211 2658 fun found (x', n1, co) =
adamc@211 2659 if x = x' then
adamc@211 2660 let
adamc@211 2661 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2662 val env = E.pushCNamedAs env x n1 k co
adamc@211 2663 in
adamc@211 2664 SOME (if n1 = n2 then
adamc@211 2665 env
adamc@211 2666 else
adamc@211 2667 E.pushCNamedAs env x n2 k (SOME (L'.CNamed n1, loc2)),
adamc@211 2668 denv)
adamc@211 2669 end
adamc@211 2670 else
adamc@211 2671 NONE
adamc@211 2672 in
adamc@211 2673 case sgi1 of
adamc@211 2674 L'.SgiClassAbs (x', n1) => found (x', n1, NONE)
adamc@211 2675 | L'.SgiClass (x', n1, c) => found (x', n1, SOME c)
adamc@211 2676 | _ => NONE
adamc@211 2677 end)
adamc@211 2678 | L'.SgiClass (x, n2, c2) =>
adamc@211 2679 seek (fn sgi1All as (sgi1, _) =>
adamc@211 2680 let
adamc@211 2681 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2682
adamc@211 2683 fun found (x', n1, c1) =
adamc@211 2684 if x = x' then
adamc@211 2685 let
adamc@218 2686 fun good () =
adamc@218 2687 let
adamc@218 2688 val env = E.pushCNamedAs env x n2 k (SOME c2)
adamc@218 2689 val env = if n1 = n2 then
adamc@218 2690 env
adamc@218 2691 else
adamc@218 2692 E.pushCNamedAs env x n1 k (SOME c1)
adamc@218 2693 in
adamc@218 2694 SOME (env, denv)
adamc@218 2695 end
adamc@211 2696 in
adamc@211 2697 (case unifyCons (env, denv) c1 c2 of
adamc@211 2698 [] => good ()
adamc@211 2699 | _ => NONE)
adamc@211 2700 handle CUnify (c1, c2, err) =>
adamc@211 2701 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@211 2702 good ())
adamc@211 2703 end
adamc@211 2704 else
adamc@211 2705 NONE
adamc@211 2706 in
adamc@211 2707 case sgi1 of
adamc@211 2708 L'.SgiClass (x', n1, c1) => found (x', n1, c1)
adamc@211 2709 | _ => NONE
adamc@211 2710 end)
adamc@31 2711 end
adamc@31 2712 in
adamc@88 2713 ignore (foldl folder (env, denv) sgis2)
adamc@31 2714 end
adamc@31 2715
adamc@41 2716 | (L'.SgnFun (m1, n1, dom1, ran1), L'.SgnFun (m2, n2, dom2, ran2)) =>
adamc@43 2717 let
adamc@43 2718 val ran1 =
adamc@43 2719 if n1 = n2 then
adamc@43 2720 ran1
adamc@43 2721 else
adamc@43 2722 subStrInSgn (n1, n2) ran1
adamc@43 2723 in
adamc@86 2724 subSgn (env, denv) dom2 dom1;
adamc@86 2725 subSgn (E.pushStrNamedAs env m2 n2 dom2, denv) ran1 ran2
adamc@43 2726 end
adamc@41 2727
adamc@41 2728 | _ => sgnError env (SgnWrongForm (sgn1, sgn2))
adamc@41 2729
adamc@61 2730
adamc@228 2731 fun elabDecl ((d, loc), (env, denv, gs : constraint list)) =
adamc@76 2732 case d of
adamc@76 2733 L.DCon (x, ko, c) =>
adamc@76 2734 let
adamc@76 2735 val k' = case ko of
adamc@76 2736 NONE => kunif loc
adamc@76 2737 | SOME k => elabKind k
adamc@76 2738
adamc@83 2739 val (c', ck, gs') = elabCon (env, denv) c
adamc@76 2740 val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@76 2741 in
adamc@76 2742 checkKind env c' ck k';
adamc@76 2743
adamc@228 2744 ([(L'.DCon (x, n, k', c'), loc)], (env', denv, enD gs' @ gs))
adamc@76 2745 end
adamc@191 2746 | L.DDatatype (x, xs, xcs) =>
adamc@156 2747 let
adamc@156 2748 val k = (L'.KType, loc)
adamc@191 2749 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 2750 val (env, n) = E.pushCNamed env x k' NONE
adamc@156 2751 val t = (L'.CNamed n, loc)
adamc@194 2752 val nxs = length xs - 1
adamc@194 2753 val t = ListUtil.foldli (fn (i, _, t) => (L'.CApp (t, (L'.CRel (nxs - i), loc)), loc)) t xs
adamc@191 2754
adamc@191 2755 val (env', denv') = foldl (fn (x, (env', denv')) =>
adamc@191 2756 (E.pushCRel env' x k,
adamc@191 2757 D.enter denv')) (env, denv) xs
adamc@156 2758
adamc@156 2759 val (xcs, (used, env, gs)) =
adamc@156 2760 ListUtil.foldlMap
adamc@156 2761 (fn ((x, to), (used, env, gs)) =>
adamc@156 2762 let
adamc@156 2763 val (to, t, gs') = case to of
adamc@156 2764 NONE => (NONE, t, gs)
adamc@156 2765 | SOME t' =>
adamc@156 2766 let
adamc@191 2767 val (t', tk, gs') = elabCon (env', denv') t'
adamc@156 2768 in
adamc@191 2769 checkKind env' t' tk k;
adamc@228 2770 (SOME t', (L'.TFun (t', t), loc), enD gs' @ gs)
adamc@156 2771 end
adamc@191 2772 val t = foldr (fn (x, t) => (L'.TCFun (L'.Implicit, x, k, t), loc)) t xs
adamc@156 2773
adamc@156 2774 val (env, n') = E.pushENamed env x t
adamc@156 2775 in
adamc@156 2776 if SS.member (used, x) then
adamc@156 2777 strError env (DuplicateConstructor (x, loc))
adamc@156 2778 else
adamc@156 2779 ();
adamc@156 2780 ((x, n', to), (SS.add (used, x), env, gs'))
adamc@156 2781 end)
adamc@156 2782 (SS.empty, env, []) xcs
adamc@171 2783
adamc@191 2784 val env = E.pushDatatype env n xs xcs
adamc@156 2785 in
adamc@191 2786 ([(L'.DDatatype (x, n, xs, xcs), loc)], (env, denv, gs))
adamc@156 2787 end
adamc@156 2788
adamc@157 2789 | L.DDatatypeImp (_, [], _) => raise Fail "Empty DDatatypeImp"
adamc@157 2790
adamc@157 2791 | L.DDatatypeImp (x, m1 :: ms, s) =>
adamc@157 2792 (case E.lookupStr env m1 of
adamc@157 2793 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@157 2794 ([], (env, denv, gs)))
adamc@157 2795 | SOME (n, sgn) =>
adamc@157 2796 let
adamc@157 2797 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@157 2798 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@157 2799 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@157 2800 (strerror, sgnerror))
adamc@157 2801 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@157 2802 ((L'.StrVar n, loc), sgn) ms
adamc@157 2803 in
adamc@158 2804 case hnormCon (env, denv) (L'.CModProj (n, ms, s), loc) of
adamc@228 2805 ((L'.CModProj (n, ms, s), _), gs') =>
adamc@158 2806 (case E.projectDatatype env {sgn = sgn, str = str, field = s} of
adamc@158 2807 NONE => (conError env (UnboundDatatype (loc, s));
adamc@158 2808 ([], (env, denv, gs)))
adamc@191 2809 | SOME (xs, xncs) =>
adamc@158 2810 let
adamc@158 2811 val k = (L'.KType, loc)
adamc@191 2812 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@158 2813 val t = (L'.CModProj (n, ms, s), loc)
adamc@191 2814 val (env, n') = E.pushCNamed env x k' (SOME t)
adamc@191 2815 val env = E.pushDatatype env n' xs xncs
adamc@157 2816
adamc@158 2817 val t = (L'.CNamed n', loc)
adamc@158 2818 val env = foldl (fn ((x, n, to), env) =>
adamc@158 2819 let
adamc@158 2820 val t = case to of
adamc@158 2821 NONE => t
adamc@158 2822 | SOME t' => (L'.TFun (t', t), loc)
adamc@191 2823
adamc@191 2824 val t = foldr (fn (x, t) =>
adamc@191 2825 (L'.TCFun (L'.Implicit, x, k, t), loc))
adamc@191 2826 t xs
adamc@158 2827 in
adamc@158 2828 E.pushENamedAs env x n t
adamc@158 2829 end) env xncs
adamc@158 2830 in
adamc@228 2831 ([(L'.DDatatypeImp (x, n', n, ms, s, xs, xncs), loc)], (env, denv, enD gs' @ gs))
adamc@158 2832 end)
adamc@158 2833 | _ => (strError env (NotDatatype loc);
adamc@158 2834 ([], (env, denv, [])))
adamc@157 2835 end)
adamc@157 2836
adamc@76 2837 | L.DVal (x, co, e) =>
adamc@76 2838 let
adamc@123 2839 val (c', _, gs1) = case co of
adamc@83 2840 NONE => (cunif (loc, ktype), ktype, [])
adamc@83 2841 | SOME c => elabCon (env, denv) c
adamc@76 2842
adamc@83 2843 val (e', et, gs2) = elabExp (env, denv) e
adamc@217 2844 val gs3 = checkCon (env, denv) e' et c'
adamc@217 2845 val (c', gs4) = normClassConstraint (env, denv) c'
adamc@76 2846 val (env', n) = E.pushENamed env x c'
adamc@76 2847 in
adamc@217 2848 (*prefaces "DVal" [("x", Print.PD.string x),
adamc@217 2849 ("c'", p_con env c')];*)
adamc@228 2850 ([(L'.DVal (x, n, c', e'), loc)], (env', denv, enD gs1 @ gs2 @ enD gs3 @ enD gs4 @ gs))
adamc@76 2851 end
adamc@123 2852 | L.DValRec vis =>
adamc@123 2853 let
adamc@238 2854 fun allowable (e, _) =
adamc@238 2855 case e of
adamc@238 2856 L.EAbs _ => true
adamc@238 2857 | L.ECAbs (_, _, _, e) => allowable e
adamc@238 2858 | L.EDisjoint (_, _, e) => allowable e
adamc@238 2859 | _ => false
adamc@238 2860
adamc@123 2861 val (vis, gs) = ListUtil.foldlMap
adamc@123 2862 (fn ((x, co, e), gs) =>
adamc@123 2863 let
adamc@123 2864 val (c', _, gs1) = case co of
adamc@123 2865 NONE => (cunif (loc, ktype), ktype, [])
adamc@123 2866 | SOME c => elabCon (env, denv) c
adamc@123 2867 in
adamc@228 2868 ((x, c', e), enD gs1 @ gs)
adamc@123 2869 end) [] vis
adamc@123 2870
adamc@123 2871 val (vis, env) = ListUtil.foldlMap (fn ((x, c', e), env) =>
adamc@123 2872 let
adamc@123 2873 val (env, n) = E.pushENamed env x c'
adamc@123 2874 in
adamc@123 2875 ((x, n, c', e), env)
adamc@123 2876 end) env vis
adamc@123 2877
adamc@123 2878 val (vis, gs) = ListUtil.foldlMap (fn ((x, n, c', e), gs) =>
adamc@123 2879 let
adamc@123 2880 val (e', et, gs1) = elabExp (env, denv) e
adamc@123 2881
adamc@123 2882 val gs2 = checkCon (env, denv) e' et c'
adamc@123 2883 in
adamc@238 2884 if allowable e then
adamc@238 2885 ()
adamc@238 2886 else
adamc@238 2887 expError env (IllegalRec (x, e'));
adamc@228 2888 ((x, n, c', e'), gs1 @ enD gs2 @ gs)
adamc@123 2889 end) gs vis
adamc@123 2890 in
adamc@123 2891 ([(L'.DValRec vis, loc)], (env, denv, gs))
adamc@123 2892 end
adamc@76 2893
adamc@76 2894 | L.DSgn (x, sgn) =>
adamc@76 2895 let
adamc@83 2896 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2897 val (env', n) = E.pushSgnNamed env x sgn'
adamc@76 2898 in
adamc@228 2899 ([(L'.DSgn (x, n, sgn'), loc)], (env', denv, enD gs' @ gs))
adamc@76 2900 end
adamc@76 2901
adamc@76 2902 | L.DStr (x, sgno, str) =>
adamc@76 2903 let
adamc@93 2904 val () = if x = "Basis" then
adamc@93 2905 raise Fail "Not allowed to redefine structure 'Basis'"
adamc@93 2906 else
adamc@93 2907 ()
adamc@93 2908
adamc@83 2909 val formal = Option.map (elabSgn (env, denv)) sgno
adamc@76 2910
adamc@83 2911 val (str', sgn', gs') =
adamc@78 2912 case formal of
adamc@78 2913 NONE =>
adamc@78 2914 let
adamc@83 2915 val (str', actual, ds) = elabStr (env, denv) str
adamc@78 2916 in
adamc@83 2917 (str', selfifyAt env {str = str', sgn = actual}, ds)
adamc@78 2918 end
adamc@83 2919 | SOME (formal, gs1) =>
adamc@78 2920 let
adamc@78 2921 val str =
adamc@78 2922 case #1 (hnormSgn env formal) of
adamc@78 2923 L'.SgnConst sgis =>
adamc@78 2924 (case #1 str of
adamc@78 2925 L.StrConst ds =>
adamc@78 2926 let
adamc@78 2927 val needed = foldl (fn ((sgi, _), needed) =>
adamc@78 2928 case sgi of
adamc@78 2929 L'.SgiConAbs (x, _, _) => SS.add (needed, x)
adamc@78 2930 | _ => needed)
adamc@78 2931 SS.empty sgis
adamc@78 2932
adamc@78 2933 val needed = foldl (fn ((d, _), needed) =>
adamc@78 2934 case d of
adamc@78 2935 L.DCon (x, _, _) => (SS.delete (needed, x)
adamc@78 2936 handle NotFound => needed)
adamc@218 2937 | L.DClass (x, _) => (SS.delete (needed, x)
adamc@218 2938 handle NotFound => needed)
adamc@78 2939 | L.DOpen _ => SS.empty
adamc@78 2940 | _ => needed)
adamc@78 2941 needed ds
adamc@78 2942 in
adamc@78 2943 case SS.listItems needed of
adamc@78 2944 [] => str
adamc@78 2945 | xs =>
adamc@78 2946 let
adamc@78 2947 val kwild = (L.KWild, #2 str)
adamc@78 2948 val cwild = (L.CWild kwild, #2 str)
adamc@78 2949 val ds' = map (fn x => (L.DCon (x, NONE, cwild), #2 str)) xs
adamc@78 2950 in
adamc@78 2951 (L.StrConst (ds @ ds'), #2 str)
adamc@78 2952 end
adamc@78 2953 end
adamc@78 2954 | _ => str)
adamc@78 2955 | _ => str
adamc@78 2956
adamc@83 2957 val (str', actual, gs2) = elabStr (env, denv) str
adamc@78 2958 in
adamc@158 2959 subSgn (env, denv) (selfifyAt env {str = str', sgn = actual}) formal;
adamc@228 2960 (str', formal, enD gs1 @ gs2)
adamc@78 2961 end
adamc@76 2962
adamc@76 2963 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 2964 in
adamc@76 2965 case #1 (hnormSgn env sgn') of
adamc@76 2966 L'.SgnFun _ =>
adamc@76 2967 (case #1 str' of
adamc@76 2968 L'.StrFun _ => ()
adamc@76 2969 | _ => strError env (FunctorRebind loc))
adamc@76 2970 | _ => ();
adamc@76 2971
adamc@88 2972 ([(L'.DStr (x, n, sgn', str'), loc)], (env', denv, gs' @ gs))
adamc@76 2973 end
adamc@76 2974
adamc@76 2975 | L.DFfiStr (x, sgn) =>
adamc@76 2976 let
adamc@83 2977 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2978
adamc@76 2979 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 2980 in
adamc@228 2981 ([(L'.DFfiStr (x, n, sgn'), loc)], (env', denv, enD gs' @ gs))
adamc@76 2982 end
adamc@76 2983
adamc@76 2984 | L.DOpen (m, ms) =>
adamc@88 2985 (case E.lookupStr env m of
adamc@88 2986 NONE => (strError env (UnboundStr (loc, m));
adamc@205 2987 ([], (env, denv, gs)))
adamc@88 2988 | SOME (n, sgn) =>
adamc@88 2989 let
adamc@88 2990 val (_, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@88 2991 case E.projectStr env {str = str, sgn = sgn, field = m} of
adamc@88 2992 NONE => (strError env (UnboundStr (loc, m));
adamc@88 2993 (strerror, sgnerror))
adamc@88 2994 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@88 2995 ((L'.StrVar n, loc), sgn) ms
adamc@83 2996
adamc@88 2997 val (ds, (env', denv')) = dopen (env, denv) {str = n, strs = ms, sgn = sgn}
adamc@88 2998 val denv' = dopenConstraints (loc, env', denv') {str = m, strs = ms}
adamc@88 2999 in
adamc@205 3000 (ds, (env', denv', gs))
adamc@88 3001 end)
adamc@88 3002
adamc@88 3003 | L.DConstraint (c1, c2) =>
adamc@88 3004 let
adamc@88 3005 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@88 3006 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@90 3007 val gs3 = D.prove env denv (c1', c2', loc)
adamc@88 3008
adamc@90 3009 val (denv', gs4) = D.assert env denv (c1', c2')
adamc@88 3010 in
adamc@88 3011 checkKind env c1' k1 (L'.KRecord (kunif loc), loc);
adamc@88 3012 checkKind env c2' k2 (L'.KRecord (kunif loc), loc);
adamc@88 3013
adamc@228 3014 ([(L'.DConstraint (c1', c2'), loc)], (env, denv', enD gs1 @ enD gs2 @ enD gs3 @ enD gs4 @ gs))
adamc@88 3015 end
adamc@88 3016
adamc@88 3017 | L.DOpenConstraints (m, ms) =>
adamc@88 3018 let
adamc@88 3019 val denv = dopenConstraints (loc, env, denv) {str = m, strs = ms}
adamc@88 3020 in
adamc@205 3021 ([], (env, denv, gs))
adamc@88 3022 end
adamc@3 3023
adamc@109 3024 | L.DExport str =>
adamc@100 3025 let
adamc@205 3026 val (str', sgn, gs') = elabStr (env, denv) str
adamc@100 3027
adamc@109 3028 val sgn =
adamc@109 3029 case #1 (hnormSgn env sgn) of
adamc@109 3030 L'.SgnConst sgis =>
adamc@109 3031 let
adamc@146 3032 fun doOne (all as (sgi, _), env) =
adamc@146 3033 (case sgi of
adamc@146 3034 L'.SgiVal (x, n, t) =>
adamc@146 3035 (case hnormCon (env, denv) t of
adamc@146 3036 ((L'.TFun (dom, ran), _), []) =>
adamc@146 3037 (case (hnormCon (env, denv) dom, hnormCon (env, denv) ran) of
adamc@146 3038 (((L'.TRecord domR, _), []),
adamc@146 3039 ((L'.CApp (tf, arg3), _), [])) =>
adamc@146 3040 (case (hnormCon (env, denv) tf, hnormCon (env, denv) arg3) of
adamc@146 3041 (((L'.CApp (tf, arg2), _), []),
adamc@146 3042 (((L'.CRecord (_, []), _), []))) =>
adamc@146 3043 (case (hnormCon (env, denv) tf) of
adamc@146 3044 ((L'.CApp (tf, arg1), _), []) =>
adamc@146 3045 (case (hnormCon (env, denv) tf,
adamc@146 3046 hnormCon (env, denv) domR,
adamc@152 3047 hnormCon (env, denv) arg1,
adamc@146 3048 hnormCon (env, denv) arg2) of
adamc@152 3049 ((tf, []), (domR, []), (arg1, []),
adamc@146 3050 ((L'.CRecord (_, []), _), [])) =>
adamc@146 3051 let
adamc@146 3052 val t = (L'.CApp (tf, arg1), loc)
adamc@146 3053 val t = (L'.CApp (t, arg2), loc)
adamc@146 3054 val t = (L'.CApp (t, arg3), loc)
adamc@146 3055 in
adamc@146 3056 (L'.SgiVal (x, n, (L'.TFun ((L'.TRecord domR, loc),
adamc@146 3057 t),
adamc@146 3058 loc)), loc)
adamc@146 3059 end
adamc@146 3060 | _ => all)
adamc@146 3061 | _ => all)
adamc@146 3062 | _ => all)
adamc@146 3063 | _ => all)
adamc@146 3064 | _ => all)
adamc@146 3065 | _ => all,
adamc@146 3066 E.sgiBinds env all)
adamc@109 3067 in
adamc@146 3068 (L'.SgnConst (#1 (ListUtil.foldlMap doOne env sgis)), loc)
adamc@109 3069 end
adamc@109 3070 | _ => sgn
adamc@100 3071 in
adamc@205 3072 ([(L'.DExport (E.newNamed (), sgn, str'), loc)], (env, denv, gs' @ gs))
adamc@100 3073 end
adamc@100 3074
adamc@203 3075 | L.DTable (x, c) =>
adamc@203 3076 let
adamc@205 3077 val (c', k, gs') = elabCon (env, denv) c
adamc@210 3078 val (env, n) = E.pushENamed env x (L'.CApp (tableOf (), c'), loc)
adamc@203 3079 in
adamc@203 3080 checkKind env c' k (L'.KRecord (L'.KType, loc), loc);
adamc@228 3081 ([(L'.DTable (!basis_r, x, n, c'), loc)], (env, denv, enD gs' @ gs))
adamc@203 3082 end
adamc@203 3083
adamc@211 3084 | L.DClass (x, c) =>
adamc@211 3085 let
adamc@211 3086 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 3087 val (c', ck, gs) = elabCon (env, denv) c
adamc@211 3088 val (env, n) = E.pushCNamed env x k (SOME c')
adamc@211 3089 val env = E.pushClass env n
adamc@211 3090 in
adamc@211 3091 checkKind env c' ck k;
adamc@213 3092 ([(L'.DClass (x, n, c'), loc)], (env, denv, []))
adamc@211 3093 end
adamc@211 3094
adamc@83 3095 and elabStr (env, denv) (str, loc) =
adamc@31 3096 case str of
adamc@31 3097 L.StrConst ds =>
adamc@31 3098 let
adamc@88 3099 val (ds', (_, _, gs)) = ListUtil.foldlMapConcat elabDecl (env, denv, []) ds
adamc@123 3100 val sgis = ListUtil.mapConcat sgiOfDecl ds'
adamc@63 3101
adamc@63 3102 val (sgis, _, _, _, _) =
adamc@64 3103 foldr (fn ((sgi, loc), (sgis, cons, vals, sgns, strs)) =>
adamc@63 3104 case sgi of
adamc@64 3105 L'.SgiConAbs (x, n, k) =>
adamc@64 3106 let
adamc@64 3107 val (cons, x) =
adamc@64 3108 if SS.member (cons, x) then
adamc@64 3109 (cons, "?" ^ x)
adamc@64 3110 else
adamc@64 3111 (SS.add (cons, x), x)
adamc@64 3112 in
adamc@64 3113 ((L'.SgiConAbs (x, n, k), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 3114 end
adamc@64 3115 | L'.SgiCon (x, n, k, c) =>
adamc@64 3116 let
adamc@64 3117 val (cons, x) =
adamc@64 3118 if SS.member (cons, x) then
adamc@64 3119 (cons, "?" ^ x)
adamc@64 3120 else
adamc@64 3121 (SS.add (cons, x), x)
adamc@64 3122 in
adamc@64 3123 ((L'.SgiCon (x, n, k, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 3124 end
adamc@191 3125 | L'.SgiDatatype (x, n, xs, xncs) =>
adamc@156 3126 let
adamc@156 3127 val (cons, x) =
adamc@156 3128 if SS.member (cons, x) then
adamc@156 3129 (cons, "?" ^ x)
adamc@156 3130 else
adamc@156 3131 (SS.add (cons, x), x)
adamc@156 3132
adamc@156 3133 val (xncs, vals) =
adamc@156 3134 ListUtil.foldlMap
adamc@156 3135 (fn ((x, n, t), vals) =>
adamc@156 3136 if SS.member (vals, x) then
adamc@156 3137 (("?" ^ x, n, t), vals)
adamc@156 3138 else
adamc@156 3139 ((x, n, t), SS.add (vals, x)))
adamc@156 3140 vals xncs
adamc@156 3141 in
adamc@191 3142 ((L'.SgiDatatype (x, n, xs, xncs), loc) :: sgis, cons, vals, sgns, strs)
adamc@156 3143 end
adamc@191 3144 | L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs) =>
adamc@156 3145 let
adamc@156 3146 val (cons, x) =
adamc@156 3147 if SS.member (cons, x) then
adamc@156 3148 (cons, "?" ^ x)
adamc@156 3149 else
adamc@156 3150 (SS.add (cons, x), x)
adamc@156 3151 in
adamc@191 3152 ((L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs), loc) :: sgis, cons, vals, sgns, strs)
adamc@156 3153 end
adamc@64 3154 | L'.SgiVal (x, n, c) =>
adamc@64 3155 let
adamc@64 3156 val (vals, x) =
adamc@64 3157 if SS.member (vals, x) then
adamc@64 3158 (vals, "?" ^ x)
adamc@64 3159 else
adamc@64 3160 (SS.add (vals, x), x)
adamc@64 3161 in
adamc@64 3162 ((L'.SgiVal (x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 3163 end
adamc@64 3164 | L'.SgiSgn (x, n, sgn) =>
adamc@64 3165 let
adamc@64 3166 val (sgns, x) =
adamc@64 3167 if SS.member (sgns, x) then
adamc@64 3168 (sgns, "?" ^ x)
adamc@64 3169 else
adamc@64 3170 (SS.add (sgns, x), x)
adamc@64 3171 in
adamc@64 3172 ((L'.SgiSgn (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 3173 end
adamc@64 3174
adamc@64 3175 | L'.SgiStr (x, n, sgn) =>
adamc@64 3176 let
adamc@64 3177 val (strs, x) =
adamc@64 3178 if SS.member (strs, x) then
adamc@64 3179 (strs, "?" ^ x)
adamc@64 3180 else
adamc@64 3181 (SS.add (strs, x), x)
adamc@64 3182 in
adamc@64 3183 ((L'.SgiStr (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@88 3184 end
adamc@203 3185 | L'.SgiConstraint _ => ((sgi, loc) :: sgis, cons, vals, sgns, strs)
adamc@205 3186 | L'.SgiTable (tn, x, n, c) =>
adamc@203 3187 let
adamc@203 3188 val (vals, x) =
adamc@203 3189 if SS.member (vals, x) then
adamc@203 3190 (vals, "?" ^ x)
adamc@203 3191 else
adamc@203 3192 (SS.add (vals, x), x)
adamc@203 3193 in
adamc@205 3194 ((L'.SgiTable (tn, x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@211 3195 end
adamc@211 3196 | L'.SgiClassAbs (x, n) =>
adamc@211 3197 let
adamc@211 3198 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 3199
adamc@211 3200 val (cons, x) =
adamc@211 3201 if SS.member (cons, x) then
adamc@211 3202 (cons, "?" ^ x)
adamc@211 3203 else
adamc@211 3204 (SS.add (cons, x), x)
adamc@211 3205 in
adamc@211 3206 ((L'.SgiClassAbs (x, n), loc) :: sgis, cons, vals, sgns, strs)
adamc@211 3207 end
adamc@211 3208 | L'.SgiClass (x, n, c) =>
adamc@211 3209 let
adamc@211 3210 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 3211
adamc@211 3212 val (cons, x) =
adamc@211 3213 if SS.member (cons, x) then
adamc@211 3214 (cons, "?" ^ x)
adamc@211 3215 else
adamc@211 3216 (SS.add (cons, x), x)
adamc@211 3217 in
adamc@211 3218 ((L'.SgiClass (x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@203 3219 end)
adamc@64 3220
adamc@63 3221 ([], SS.empty, SS.empty, SS.empty, SS.empty) sgis
adamc@31 3222 in
adamc@83 3223 ((L'.StrConst ds', loc), (L'.SgnConst sgis, loc), gs)
adamc@31 3224 end
adamc@31 3225 | L.StrVar x =>
adamc@31 3226 (case E.lookupStr env x of
adamc@31 3227 NONE =>
adamc@31 3228 (strError env (UnboundStr (loc, x));
adamc@83 3229 (strerror, sgnerror, []))
adamc@83 3230 | SOME (n, sgn) => ((L'.StrVar n, loc), sgn, []))
adamc@34 3231 | L.StrProj (str, x) =>
adamc@34 3232 let
adamc@83 3233 val (str', sgn, gs) = elabStr (env, denv) str
adamc@34 3234 in
adamc@34 3235 case E.projectStr env {str = str', sgn = sgn, field = x} of
adamc@34 3236 NONE => (strError env (UnboundStr (loc, x));
adamc@83 3237 (strerror, sgnerror, []))
adamc@83 3238 | SOME sgn => ((L'.StrProj (str', x), loc), sgn, gs)
adamc@34 3239 end
adamc@41 3240 | L.StrFun (m, dom, ranO, str) =>
adamc@41 3241 let
adamc@83 3242 val (dom', gs1) = elabSgn (env, denv) dom
adamc@41 3243 val (env', n) = E.pushStrNamed env m dom'
adamc@83 3244 val (str', actual, gs2) = elabStr (env', denv) str
adamc@41 3245
adamc@83 3246 val (formal, gs3) =
adamc@41 3247 case ranO of
adamc@83 3248 NONE => (actual, [])
adamc@41 3249 | SOME ran =>
adamc@41 3250 let
adamc@83 3251 val (ran', gs) = elabSgn (env', denv) ran
adamc@41 3252 in
adamc@86 3253 subSgn (env', denv) actual ran';
adamc@83 3254 (ran', gs)
adamc@41 3255 end
adamc@41 3256 in
adamc@41 3257 ((L'.StrFun (m, n, dom', formal, str'), loc),
adamc@83 3258 (L'.SgnFun (m, n, dom', formal), loc),
adamc@228 3259 enD gs1 @ gs2 @ enD gs3)
adamc@41 3260 end
adamc@44 3261 | L.StrApp (str1, str2) =>
adamc@44 3262 let
adamc@83 3263 val (str1', sgn1, gs1) = elabStr (env, denv) str1
adamc@83 3264 val (str2', sgn2, gs2) = elabStr (env, denv) str2
adamc@44 3265 in
adamc@44 3266 case #1 (hnormSgn env sgn1) of
adamc@83 3267 L'.SgnError => (strerror, sgnerror, [])
adamc@44 3268 | L'.SgnFun (m, n, dom, ran) =>
adamc@86 3269 (subSgn (env, denv) sgn2 dom;
adamc@44 3270 case #1 (hnormSgn env ran) of
adamc@83 3271 L'.SgnError => (strerror, sgnerror, [])
adamc@44 3272 | L'.SgnConst sgis =>
adamc@44 3273 ((L'.StrApp (str1', str2'), loc),
adamc@83 3274 (L'.SgnConst ((L'.SgiStr (m, n, selfifyAt env {str = str2', sgn = sgn2}), loc) :: sgis), loc),
adamc@83 3275 gs1 @ gs2)
adamc@44 3276 | _ => raise Fail "Unable to hnormSgn in functor application")
adamc@44 3277 | _ => (strError env (NotFunctor sgn1);
adamc@83 3278 (strerror, sgnerror, []))
adamc@44 3279 end
adamc@31 3280
adamc@56 3281 fun elabFile basis env file =
adamc@56 3282 let
adamc@83 3283 val (sgn, gs) = elabSgn (env, D.empty) (L.SgnConst basis, ErrorMsg.dummySpan)
adamc@83 3284 val () = case gs of
adamc@83 3285 [] => ()
adamc@207 3286 | _ => (app (fn (_, env, _, c1, c2) =>
adamc@207 3287 prefaces "Unresolved"
adamc@207 3288 [("c1", p_con env c1),
adamc@207 3289 ("c2", p_con env c2)]) gs;
adamc@207 3290 raise Fail "Unresolved disjointness constraints in Basis")
adamc@83 3291
adamc@56 3292 val (env', basis_n) = E.pushStrNamed env "Basis" sgn
adamc@210 3293 val () = basis_r := basis_n
adamc@56 3294
adamc@88 3295 val (ds, (env', _)) = dopen (env', D.empty) {str = basis_n, strs = [], sgn = sgn}
adamc@56 3296
adamc@56 3297 fun discoverC r x =
adamc@56 3298 case E.lookupC env' x of
adamc@56 3299 E.NotBound => raise Fail ("Constructor " ^ x ^ " unbound in Basis")
adamc@56 3300 | E.Rel _ => raise Fail ("Constructor " ^ x ^ " bound relatively in Basis")
adamc@56 3301 | E.Named (n, (_, loc)) => r := (L'.CNamed n, loc)
adamc@56 3302
adamc@56 3303 val () = discoverC int "int"
adamc@56 3304 val () = discoverC float "float"
adamc@56 3305 val () = discoverC string "string"
adamc@203 3306 val () = discoverC table "sql_table"
adamc@56 3307
adamc@83 3308 fun elabDecl' (d, (env, gs)) =
adamc@76 3309 let
adamc@76 3310 val () = resetKunif ()
adamc@76 3311 val () = resetCunif ()
adamc@88 3312 val (ds, (env, _, gs)) = elabDecl (d, (env, D.empty, gs))
adamc@76 3313 in
adamc@76 3314 if ErrorMsg.anyErrors () then
adamc@76 3315 ()
adamc@76 3316 else (
adamc@76 3317 if List.exists kunifsInDecl ds then
adamc@91 3318 declError env (KunifsRemain ds)
adamc@76 3319 else
adamc@76 3320 ();
adamc@76 3321
adamc@76 3322 case ListUtil.search cunifsInDecl ds of
adamc@76 3323 NONE => ()
adamc@76 3324 | SOME loc =>
adamc@91 3325 declError env (CunifsRemain ds)
adamc@76 3326 );
adamc@76 3327
adamc@83 3328 (ds, (env, gs))
adamc@76 3329 end
adamc@76 3330
adamc@83 3331 val (file, (_, gs)) = ListUtil.foldlMapConcat elabDecl' (env', []) file
adamc@56 3332 in
adamc@84 3333 if ErrorMsg.anyErrors () then
adamc@84 3334 ()
adamc@84 3335 else
adamc@228 3336 app (fn Disjoint (loc, env, denv, c1, c2) =>
adamc@228 3337 (case D.prove env denv (c1, c2, loc) of
adamc@228 3338 [] => ()
adamc@228 3339 | _ =>
adamc@228 3340 (ErrorMsg.errorAt loc "Couldn't prove field name disjointness";
adamc@228 3341 eprefaces' [("Con 1", p_con env c1),
adamc@228 3342 ("Con 2", p_con env c2),
adamc@228 3343 ("Hnormed 1", p_con env (ElabOps.hnormCon env c1)),
adamc@228 3344 ("Hnormed 2", p_con env (ElabOps.hnormCon env c2))]))
adamc@228 3345 | TypeClass (env, c, r, loc) =>
adamc@228 3346 case E.resolveClass env c of
adamc@228 3347 SOME e => r := SOME e
adamc@228 3348 | NONE => expError env (Unresolvable (loc, c))) gs;
adamc@83 3349
adamc@56 3350 (L'.DFfiStr ("Basis", basis_n, sgn), ErrorMsg.dummySpan) :: ds @ file
adamc@56 3351 end
adamc@2 3352
adamc@2 3353 end