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Resolving lingering type class constraints
author Adam Chlipala <adamc@hcoop.net>
date Thu, 21 Aug 2008 14:45:31 -0400
parents bbe5899a9585
children c466678af854
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@10 1036
adamc@10 1037 fun expError env err =
adamc@10 1038 case err of
adamc@10 1039 UnboundExp (loc, s) =>
adamc@10 1040 ErrorMsg.errorAt loc ("Unbound expression variable " ^ s)
adamc@34 1041 | UnboundStrInExp (loc, s) =>
adamc@34 1042 ErrorMsg.errorAt loc ("Unbound structure " ^ s)
adamc@10 1043 | Unify (e, c1, c2, uerr) =>
adamc@10 1044 (ErrorMsg.errorAt (#2 e) "Unification failure";
adamc@10 1045 eprefaces' [("Expression", p_exp env e),
adamc@10 1046 ("Have con", p_con env c1),
adamc@10 1047 ("Need con", p_con env c2)];
adamc@10 1048 cunifyError env uerr)
adamc@11 1049 | Unif (action, c) =>
adamc@11 1050 (ErrorMsg.errorAt (#2 c) ("Unification variable blocks " ^ action);
adamc@11 1051 eprefaces' [("Con", p_con env c)])
adamc@11 1052 | WrongForm (variety, e, t) =>
adamc@11 1053 (ErrorMsg.errorAt (#2 e) ("Expression is not a " ^ variety);
adamc@11 1054 eprefaces' [("Expression", p_exp env e),
adamc@11 1055 ("Type", p_con env t)])
adamc@92 1056 | IncompatibleCons (c1, c2) =>
adamc@92 1057 (ErrorMsg.errorAt (#2 c1) "Incompatible constructors";
adamc@92 1058 eprefaces' [("Con 1", p_con env c1),
adamc@92 1059 ("Con 2", p_con env c2)])
adamc@171 1060 | DuplicatePatternVariable (loc, s) =>
adamc@171 1061 ErrorMsg.errorAt loc ("Duplicate pattern variable " ^ s)
adamc@171 1062 | PatUnify (p, c1, c2, uerr) =>
adamc@171 1063 (ErrorMsg.errorAt (#2 p) "Unification failure for pattern";
adamc@171 1064 eprefaces' [("Pattern", p_pat env p),
adamc@171 1065 ("Have con", p_con env c1),
adamc@171 1066 ("Need con", p_con env c2)];
adamc@171 1067 cunifyError env uerr)
adamc@174 1068 | UnboundConstructor (loc, ms, s) =>
adamc@174 1069 ErrorMsg.errorAt loc ("Unbound constructor " ^ String.concatWith "." (ms @ [s]) ^ " in pattern")
adamc@171 1070 | PatHasArg loc =>
adamc@171 1071 ErrorMsg.errorAt loc "Constructor expects no argument but is used with argument"
adamc@171 1072 | PatHasNoArg loc =>
adamc@171 1073 ErrorMsg.errorAt loc "Constructor expects argument but is used with no argument"
adamc@172 1074 | Inexhaustive loc =>
adamc@172 1075 ErrorMsg.errorAt loc "Inexhaustive 'case'"
adamc@175 1076 | DuplicatePatField (loc, s) =>
adamc@175 1077 ErrorMsg.errorAt loc ("Duplicate record field " ^ s ^ " in pattern")
adamc@220 1078 | OutOfContext (loc, co) =>
adamc@220 1079 (ErrorMsg.errorAt loc "Type class wildcard occurs out of context";
adamc@220 1080 Option.app (fn (e, c) => eprefaces' [("Function", p_exp env e),
adamc@220 1081 ("Type", p_con env c)]) co)
adamc@211 1082 | Unresolvable (loc, c) =>
adamc@211 1083 (ErrorMsg.errorAt loc "Can't resolve type class instance";
adamc@211 1084 eprefaces' [("Class constraint", p_con env c)])
adamc@210 1085
adamc@86 1086 fun checkCon (env, denv) e c1 c2 =
adamc@86 1087 unifyCons (env, denv) c1 c2
adamc@10 1088 handle CUnify (c1, c2, err) =>
adamc@86 1089 (expError env (Unify (e, c1, c2, err));
adamc@86 1090 [])
adamc@10 1091
adamc@171 1092 fun checkPatCon (env, denv) p c1 c2 =
adamc@171 1093 unifyCons (env, denv) c1 c2
adamc@171 1094 handle CUnify (c1, c2, err) =>
adamc@171 1095 (expError env (PatUnify (p, c1, c2, err));
adamc@171 1096 [])
adamc@171 1097
adamc@14 1098 fun primType env p =
adamc@56 1099 case p of
adamc@56 1100 P.Int _ => !int
adamc@56 1101 | P.Float _ => !float
adamc@56 1102 | P.String _ => !string
adamc@14 1103
adamc@71 1104 fun recCons (k, nm, v, rest, loc) =
adamc@71 1105 (L'.CConcat ((L'.CRecord (k, [(nm, v)]), loc),
adamc@71 1106 rest), loc)
adamc@71 1107
adamc@71 1108 fun foldType (dom, loc) =
adamc@71 1109 (L'.TCFun (L'.Explicit, "ran", (L'.KArrow ((L'.KRecord dom, loc), (L'.KType, loc)), loc),
adamc@71 1110 (L'.TFun ((L'.TCFun (L'.Explicit, "nm", (L'.KName, loc),
adamc@71 1111 (L'.TCFun (L'.Explicit, "v", dom,
adamc@71 1112 (L'.TCFun (L'.Explicit, "rest", (L'.KRecord dom, loc),
adamc@71 1113 (L'.TFun ((L'.CApp ((L'.CRel 3, loc), (L'.CRel 0, loc)), loc),
adamc@71 1114 (L'.CApp ((L'.CRel 3, loc),
adamc@71 1115 recCons (dom,
adamc@71 1116 (L'.CRel 2, loc),
adamc@71 1117 (L'.CRel 1, loc),
adamc@71 1118 (L'.CRel 0, loc),
adamc@71 1119 loc)), loc)), loc)),
adamc@71 1120 loc)), loc)), loc),
adamc@71 1121 (L'.TFun ((L'.CApp ((L'.CRel 0, loc), (L'.CRecord (dom, []), loc)), loc),
adamc@71 1122 (L'.TCFun (L'.Explicit, "r", (L'.KRecord dom, loc),
adamc@71 1123 (L'.CApp ((L'.CRel 1, loc), (L'.CRel 0, loc)), loc)), loc)),
adamc@71 1124 loc)), loc)), loc)
adamc@71 1125
adamc@228 1126 datatype constraint =
adamc@228 1127 Disjoint of D.goal
adamc@228 1128 | TypeClass of E.env * L'.con * L'.exp option ref * ErrorMsg.span
adamc@228 1129
adamc@228 1130 val enD = map Disjoint
adamc@228 1131
adamc@86 1132 fun elabHead (env, denv) (e as (_, loc)) t =
adamc@15 1133 let
adamc@15 1134 fun unravel (t, e) =
adamc@86 1135 let
adamc@86 1136 val (t, gs) = hnormCon (env, denv) t
adamc@86 1137 in
adamc@86 1138 case t of
adamc@86 1139 (L'.TCFun (L'.Implicit, x, k, t'), _) =>
adamc@86 1140 let
adamc@86 1141 val u = cunif (loc, k)
adamc@86 1142
adamc@86 1143 val (e, t, gs') = unravel (subConInCon (0, u) t',
adamc@86 1144 (L'.ECApp (e, u), loc))
adamc@86 1145 in
adamc@228 1146 (e, t, enD gs @ gs')
adamc@86 1147 end
adamc@228 1148 | _ => (e, t, enD gs)
adamc@86 1149 end
adamc@15 1150 in
adamc@15 1151 unravel (t, e)
adamc@15 1152 end
adamc@15 1153
adamc@174 1154 fun elabPat (pAll as (p, loc), (env, denv, bound)) =
adamc@171 1155 let
adamc@171 1156 val perror = (L'.PWild, loc)
adamc@171 1157 val terror = (L'.CError, loc)
adamc@171 1158 val pterror = (perror, terror)
adamc@171 1159 val rerror = (pterror, (env, bound))
adamc@171 1160
adamc@191 1161 fun pcon (pc, po, xs, to, dn, dk) =
adamc@188 1162 case (po, to) of
adamc@188 1163 (NONE, SOME _) => (expError env (PatHasNoArg loc);
adamc@188 1164 rerror)
adamc@188 1165 | (SOME _, NONE) => (expError env (PatHasArg loc);
adamc@188 1166 rerror)
adamc@191 1167 | (NONE, NONE) =>
adamc@191 1168 let
adamc@191 1169 val k = (L'.KType, loc)
adamc@191 1170 val unifs = map (fn _ => cunif (loc, k)) xs
adamc@191 1171 val dn = foldl (fn (u, dn) => (L'.CApp (dn, u), loc)) dn unifs
adamc@191 1172 in
adamc@191 1173 (((L'.PCon (dk, pc, unifs, NONE), loc), dn),
adamc@191 1174 (env, bound))
adamc@191 1175 end
adamc@188 1176 | (SOME p, SOME t) =>
adamc@188 1177 let
adamc@188 1178 val ((p', pt), (env, bound)) = elabPat (p, (env, denv, bound))
adamc@191 1179
adamc@191 1180 val k = (L'.KType, loc)
adamc@191 1181 val unifs = map (fn _ => cunif (loc, k)) xs
adamc@194 1182 val nxs = length unifs - 1
adamc@194 1183 val t = ListUtil.foldli (fn (i, u, t) => subConInCon (nxs - i, u) t) t unifs
adamc@191 1184 val dn = foldl (fn (u, dn) => (L'.CApp (dn, u), loc)) dn unifs
adamc@188 1185 in
adamc@191 1186 ignore (checkPatCon (env, denv) p' pt t);
adamc@191 1187 (((L'.PCon (dk, pc, unifs, SOME p'), loc), dn),
adamc@188 1188 (env, bound))
adamc@188 1189 end
adamc@171 1190 in
adamc@171 1191 case p of
adamc@171 1192 L.PWild => (((L'.PWild, loc), cunif (loc, (L'.KType, loc))),
adamc@171 1193 (env, bound))
adamc@171 1194 | L.PVar x =>
adamc@171 1195 let
adamc@171 1196 val t = if SS.member (bound, x) then
adamc@171 1197 (expError env (DuplicatePatternVariable (loc, x));
adamc@171 1198 terror)
adamc@171 1199 else
adamc@171 1200 cunif (loc, (L'.KType, loc))
adamc@171 1201 in
adamc@182 1202 (((L'.PVar (x, t), loc), t),
adamc@171 1203 (E.pushERel env x t, SS.add (bound, x)))
adamc@171 1204 end
adamc@173 1205 | L.PPrim p => (((L'.PPrim p, loc), primType env p),
adamc@173 1206 (env, bound))
adamc@171 1207 | L.PCon ([], x, po) =>
adamc@171 1208 (case E.lookupConstructor env x of
adamc@174 1209 NONE => (expError env (UnboundConstructor (loc, [], x));
adamc@171 1210 rerror)
adamc@191 1211 | SOME (dk, n, xs, to, dn) => pcon (L'.PConVar n, po, xs, to, (L'.CNamed dn, loc), dk))
adamc@174 1212 | L.PCon (m1 :: ms, x, po) =>
adamc@174 1213 (case E.lookupStr env m1 of
adamc@174 1214 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@174 1215 rerror)
adamc@174 1216 | SOME (n, sgn) =>
adamc@174 1217 let
adamc@174 1218 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@174 1219 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@182 1220 NONE => raise Fail "elabPat: Unknown substructure"
adamc@174 1221 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@174 1222 ((L'.StrVar n, loc), sgn) ms
adamc@174 1223 in
adamc@174 1224 case E.projectConstructor env {str = str, sgn = sgn, field = x} of
adamc@174 1225 NONE => (expError env (UnboundConstructor (loc, m1 :: ms, x));
adamc@174 1226 rerror)
adamc@191 1227 | SOME (dk, _, xs, to, dn) => pcon (L'.PConProj (n, ms, x), po, xs, to, dn, dk)
adamc@174 1228 end)
adamc@174 1229
adamc@175 1230 | L.PRecord (xps, flex) =>
adamc@175 1231 let
adamc@175 1232 val (xpts, (env, bound, _)) =
adamc@175 1233 ListUtil.foldlMap (fn ((x, p), (env, bound, fbound)) =>
adamc@175 1234 let
adamc@175 1235 val ((p', t), (env, bound)) = elabPat (p, (env, denv, bound))
adamc@175 1236 in
adamc@175 1237 if SS.member (fbound, x) then
adamc@175 1238 expError env (DuplicatePatField (loc, x))
adamc@175 1239 else
adamc@175 1240 ();
adamc@175 1241 ((x, p', t), (env, bound, SS.add (fbound, x)))
adamc@175 1242 end)
adamc@175 1243 (env, bound, SS.empty) xps
adamc@175 1244
adamc@175 1245 val k = (L'.KType, loc)
adamc@175 1246 val c = (L'.CRecord (k, map (fn (x, _, t) => ((L'.CName x, loc), t)) xpts), loc)
adamc@176 1247 val c =
adamc@175 1248 if flex then
adamc@176 1249 (L'.CConcat (c, cunif (loc, (L'.KRecord k, loc))), loc)
adamc@175 1250 else
adamc@176 1251 c
adamc@175 1252 in
adamc@182 1253 (((L'.PRecord xpts, loc),
adamc@175 1254 (L'.TRecord c, loc)),
adamc@175 1255 (env, bound))
adamc@175 1256 end
adamc@175 1257
adamc@171 1258 end
adamc@171 1259
adamc@172 1260 datatype coverage =
adamc@172 1261 Wild
adamc@173 1262 | None
adamc@172 1263 | Datatype of coverage IM.map
adamc@175 1264 | Record of coverage SM.map list
adamc@172 1265
adamc@172 1266 fun exhaustive (env, denv, t, ps) =
adamc@172 1267 let
adamc@172 1268 fun pcCoverage pc =
adamc@172 1269 case pc of
adamc@172 1270 L'.PConVar n => n
adamc@174 1271 | L'.PConProj (m1, ms, x) =>
adamc@174 1272 let
adamc@174 1273 val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@174 1274 in
adamc@174 1275 case E.projectConstructor env {str = str, sgn = sgn, field = x} of
adamc@174 1276 NONE => raise Fail "exhaustive: Can't project constructor"
adamc@191 1277 | SOME (_, n, _, _, _) => n
adamc@174 1278 end
adamc@172 1279
adamc@172 1280 fun coverage (p, _) =
adamc@172 1281 case p of
adamc@172 1282 L'.PWild => Wild
adamc@172 1283 | L'.PVar _ => Wild
adamc@173 1284 | L'.PPrim _ => None
adamc@191 1285 | L'.PCon (_, pc, _, NONE) => Datatype (IM.insert (IM.empty, pcCoverage pc, Wild))
adamc@191 1286 | L'.PCon (_, pc, _, SOME p) => Datatype (IM.insert (IM.empty, pcCoverage pc, coverage p))
adamc@182 1287 | L'.PRecord xps => Record [foldl (fn ((x, p, _), fmap) =>
adamc@182 1288 SM.insert (fmap, x, coverage p)) SM.empty xps]
adamc@176 1289
adamc@172 1290 fun merge (c1, c2) =
adamc@172 1291 case (c1, c2) of
adamc@173 1292 (None, _) => c2
adamc@173 1293 | (_, None) => c1
adamc@173 1294
adamc@173 1295 | (Wild, _) => Wild
adamc@172 1296 | (_, Wild) => Wild
adamc@172 1297
adamc@172 1298 | (Datatype cm1, Datatype cm2) => Datatype (IM.unionWith merge (cm1, cm2))
adamc@172 1299
adamc@175 1300 | (Record fm1, Record fm2) => Record (fm1 @ fm2)
adamc@175 1301
adamc@175 1302 | _ => None
adamc@175 1303
adamc@172 1304 fun combinedCoverage ps =
adamc@172 1305 case ps of
adamc@172 1306 [] => raise Fail "Empty pattern list for coverage checking"
adamc@172 1307 | [p] => coverage p
adamc@172 1308 | p :: ps => merge (coverage p, combinedCoverage ps)
adamc@172 1309
adamc@175 1310 fun enumerateCases t =
adamc@175 1311 let
adamc@175 1312 fun dtype cons =
adamc@175 1313 ListUtil.mapConcat (fn (_, n, to) =>
adamc@175 1314 case to of
adamc@175 1315 NONE => [Datatype (IM.insert (IM.empty, n, Wild))]
adamc@175 1316 | SOME t => map (fn c => Datatype (IM.insert (IM.empty, n, c)))
adamc@175 1317 (enumerateCases t)) cons
adamc@175 1318 in
adamc@175 1319 case #1 (#1 (hnormCon (env, denv) t)) of
adamc@175 1320 L'.CNamed n =>
adamc@175 1321 (let
adamc@175 1322 val dt = E.lookupDatatype env n
adamc@175 1323 val cons = E.constructors dt
adamc@175 1324 in
adamc@175 1325 dtype cons
adamc@175 1326 end handle E.UnboundNamed _ => [Wild])
adamc@175 1327 | L'.TRecord c =>
adamc@175 1328 (case #1 (#1 (hnormCon (env, denv) c)) of
adamc@175 1329 L'.CRecord (_, xts) =>
adamc@175 1330 let
adamc@175 1331 val xts = map (fn (x, t) => (#1 (hnormCon (env, denv) x), t)) xts
adamc@175 1332
adamc@175 1333 fun exponentiate fs =
adamc@175 1334 case fs of
adamc@175 1335 [] => [SM.empty]
adamc@175 1336 | ((L'.CName x, _), t) :: rest =>
adamc@175 1337 let
adamc@175 1338 val this = enumerateCases t
adamc@175 1339 val rest = exponentiate rest
adamc@175 1340 in
adamc@175 1341 ListUtil.mapConcat (fn fmap =>
adamc@175 1342 map (fn c => SM.insert (fmap, x, c)) this) rest
adamc@175 1343 end
adamc@175 1344 | _ => raise Fail "exponentiate: Not CName"
adamc@175 1345 in
adamc@175 1346 if List.exists (fn ((L'.CName _, _), _) => false
adamc@175 1347 | (c, _) => true) xts then
adamc@175 1348 [Wild]
adamc@175 1349 else
adamc@175 1350 map (fn ls => Record [ls]) (exponentiate xts)
adamc@175 1351 end
adamc@175 1352 | _ => [Wild])
adamc@175 1353 | _ => [Wild]
adamc@175 1354 end
adamc@175 1355
adamc@175 1356 fun coverageImp (c1, c2) =
adamc@175 1357 case (c1, c2) of
adamc@175 1358 (Wild, _) => true
adamc@175 1359
adamc@175 1360 | (Datatype cmap1, Datatype cmap2) =>
adamc@175 1361 List.all (fn (n, c2) =>
adamc@175 1362 case IM.find (cmap1, n) of
adamc@175 1363 NONE => false
adamc@175 1364 | SOME c1 => coverageImp (c1, c2)) (IM.listItemsi cmap2)
adamc@175 1365
adamc@175 1366 | (Record fmaps1, Record fmaps2) =>
adamc@175 1367 List.all (fn fmap2 =>
adamc@175 1368 List.exists (fn fmap1 =>
adamc@175 1369 List.all (fn (x, c2) =>
adamc@175 1370 case SM.find (fmap1, x) of
adamc@175 1371 NONE => true
adamc@175 1372 | SOME c1 => coverageImp (c1, c2))
adamc@175 1373 (SM.listItemsi fmap2))
adamc@175 1374 fmaps1) fmaps2
adamc@175 1375
adamc@175 1376 | _ => false
adamc@175 1377
adamc@172 1378 fun isTotal (c, t) =
adamc@172 1379 case c of
adamc@173 1380 None => (false, [])
adamc@173 1381 | Wild => (true, [])
adamc@172 1382 | Datatype cm =>
adamc@172 1383 let
adamc@172 1384 val ((t, _), gs) = hnormCon (env, denv) t
adamc@174 1385
adamc@174 1386 fun dtype cons =
adamc@174 1387 foldl (fn ((_, n, to), (total, gs)) =>
adamc@174 1388 case IM.find (cm, n) of
adamc@174 1389 NONE => (false, gs)
adamc@174 1390 | SOME c' =>
adamc@174 1391 case to of
adamc@174 1392 NONE => (total, gs)
adamc@174 1393 | SOME t' =>
adamc@174 1394 let
adamc@174 1395 val (total, gs') = isTotal (c', t')
adamc@174 1396 in
adamc@174 1397 (total, gs' @ gs)
adamc@174 1398 end)
adamc@174 1399 (true, gs) cons
adamc@191 1400
adamc@191 1401 fun unapp t =
adamc@191 1402 case t of
adamc@191 1403 L'.CApp ((t, _), _) => unapp t
adamc@191 1404 | _ => t
adamc@172 1405 in
adamc@191 1406 case unapp t of
adamc@172 1407 L'.CNamed n =>
adamc@172 1408 let
adamc@172 1409 val dt = E.lookupDatatype env n
adamc@172 1410 val cons = E.constructors dt
adamc@172 1411 in
adamc@174 1412 dtype cons
adamc@174 1413 end
adamc@174 1414 | L'.CModProj (m1, ms, x) =>
adamc@174 1415 let
adamc@174 1416 val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@174 1417 in
adamc@174 1418 case E.projectDatatype env {str = str, sgn = sgn, field = x} of
adamc@174 1419 NONE => raise Fail "isTotal: Can't project datatype"
adamc@191 1420 | SOME (_, cons) => dtype cons
adamc@172 1421 end
adamc@172 1422 | L'.CError => (true, gs)
adamc@172 1423 | _ => raise Fail "isTotal: Not a datatype"
adamc@172 1424 end
adamc@175 1425 | Record _ => (List.all (fn c2 => coverageImp (c, c2)) (enumerateCases t), [])
adamc@172 1426 in
adamc@172 1427 isTotal (combinedCoverage ps, t)
adamc@172 1428 end
adamc@172 1429
adamc@217 1430 fun unmodCon env (c, loc) =
adamc@217 1431 case c of
adamc@217 1432 L'.CNamed n =>
adamc@217 1433 (case E.lookupCNamed env n of
adamc@217 1434 (_, _, SOME (c as (L'.CModProj _, _))) => unmodCon env c
adamc@217 1435 | _ => (c, loc))
adamc@217 1436 | L'.CModProj (m1, ms, x) =>
adamc@217 1437 let
adamc@217 1438 val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@217 1439 in
adamc@217 1440 case E.projectCon env {str = str, sgn = sgn, field = x} of
adamc@217 1441 NONE => raise Fail "unmodCon: Can't projectCon"
adamc@217 1442 | SOME (_, SOME (c as (L'.CModProj _, _))) => unmodCon env c
adamc@217 1443 | _ => (c, loc)
adamc@217 1444 end
adamc@217 1445 | _ => (c, loc)
adamc@217 1446
adamc@217 1447 fun normClassConstraint envs (c, loc) =
adamc@217 1448 case c of
adamc@217 1449 L'.CApp (f, x) =>
adamc@217 1450 let
adamc@217 1451 val f = unmodCon (#1 envs) f
adamc@217 1452 val (x, gs) = hnormCon envs x
adamc@217 1453 in
adamc@217 1454 ((L'.CApp (f, x), loc), gs)
adamc@217 1455 end
adamc@217 1456 | _ => ((c, loc), [])
adamc@216 1457
adamc@92 1458 fun elabExp (env, denv) (eAll as (e, loc)) =
adamc@91 1459 let
adamc@92 1460
adamc@92 1461 in
adamc@92 1462 (*eprefaces "elabExp" [("eAll", SourcePrint.p_exp eAll)];*)
adamc@10 1463
adamc@91 1464 case e of
adamc@91 1465 L.EAnnot (e, t) =>
adamc@91 1466 let
adamc@91 1467 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1468 val (t', _, gs2) = elabCon (env, denv) t
adamc@91 1469 val gs3 = checkCon (env, denv) e' et t'
adamc@91 1470 in
adamc@228 1471 (e', t', gs1 @ enD gs2 @ enD gs3)
adamc@91 1472 end
adamc@34 1473
adamc@91 1474 | L.EPrim p => ((L'.EPrim p, loc), primType env p, [])
adamc@91 1475 | L.EVar ([], s) =>
adamc@91 1476 (case E.lookupE env s of
adamc@91 1477 E.NotBound =>
adamc@91 1478 (expError env (UnboundExp (loc, s));
adamc@91 1479 (eerror, cerror, []))
adamc@91 1480 | E.Rel (n, t) => ((L'.ERel n, loc), t, [])
adamc@191 1481 | E.Named (n, t) =>
adamc@191 1482 if Char.isUpper (String.sub (s, 0)) then
adamc@191 1483 elabHead (env, denv) (L'.ENamed n, loc) t
adamc@191 1484 else
adamc@191 1485 ((L'.ENamed n, loc), t, []))
adamc@91 1486 | L.EVar (m1 :: ms, s) =>
adamc@91 1487 (case E.lookupStr env m1 of
adamc@91 1488 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@91 1489 (eerror, cerror, []))
adamc@91 1490 | SOME (n, sgn) =>
adamc@91 1491 let
adamc@91 1492 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@91 1493 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@91 1494 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@91 1495 (strerror, sgnerror))
adamc@91 1496 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@91 1497 ((L'.StrVar n, loc), sgn) ms
adamc@10 1498
adamc@91 1499 val t = case E.projectVal env {sgn = sgn, str = str, field = s} of
adamc@91 1500 NONE => (expError env (UnboundExp (loc, s));
adamc@91 1501 cerror)
adamc@91 1502 | SOME t => t
adamc@91 1503 in
adamc@91 1504 ((L'.EModProj (n, ms, s), loc), t, [])
adamc@91 1505 end)
adamc@86 1506
adamc@211 1507 | L.EApp (e1, (L.EWild, _)) =>
adamc@210 1508 let
adamc@210 1509 val (e1', t1, gs1) = elabExp (env, denv) e1
adamc@210 1510 val (e1', t1, gs2) = elabHead (env, denv) e1' t1
adamc@210 1511 val (t1, gs3) = hnormCon (env, denv) t1
adamc@210 1512 in
adamc@210 1513 case t1 of
adamc@211 1514 (L'.TFun (dom, ran), _) =>
adamc@216 1515 let
adamc@216 1516 val (dom, gs4) = normClassConstraint (env, denv) dom
adamc@216 1517 in
adamc@216 1518 case E.resolveClass env dom of
adamc@228 1519 NONE =>
adamc@228 1520 let
adamc@228 1521 val r = ref NONE
adamc@228 1522 in
adamc@228 1523 ((L'.EUnif r, loc), ran, [TypeClass (env, dom, r, loc)])
adamc@228 1524 end
adamc@228 1525 | SOME pf => ((L'.EApp (e1', pf), loc), ran, gs1 @ gs2 @ enD gs3 @ enD gs4)
adamc@216 1526 end
adamc@220 1527 | _ => (expError env (OutOfContext (loc, SOME (e1', t1)));
adamc@211 1528 (eerror, cerror, []))
adamc@210 1529 end
adamc@220 1530 | L.EWild => (expError env (OutOfContext (loc, NONE));
adamc@211 1531 (eerror, cerror, []))
adamc@210 1532
adamc@91 1533 | L.EApp (e1, e2) =>
adamc@91 1534 let
adamc@91 1535 val (e1', t1, gs1) = elabExp (env, denv) e1
adamc@91 1536 val (e1', t1, gs2) = elabHead (env, denv) e1' t1
adamc@91 1537 val (e2', t2, gs3) = elabExp (env, denv) e2
adamc@71 1538
adamc@91 1539 val dom = cunif (loc, ktype)
adamc@91 1540 val ran = cunif (loc, ktype)
adamc@91 1541 val t = (L'.TFun (dom, ran), dummy)
adamc@91 1542
adamc@91 1543 val gs4 = checkCon (env, denv) e1' t1 t
adamc@91 1544 val gs5 = checkCon (env, denv) e2' t2 dom
adamc@205 1545
adamc@228 1546 val gs = gs1 @ gs2 @ gs3 @ enD gs4 @ enD gs5
adamc@91 1547 in
adamc@205 1548 ((L'.EApp (e1', e2'), loc), ran, gs)
adamc@91 1549 end
adamc@91 1550 | L.EAbs (x, to, e) =>
adamc@91 1551 let
adamc@91 1552 val (t', gs1) = case to of
adamc@91 1553 NONE => (cunif (loc, ktype), [])
adamc@91 1554 | SOME t =>
adamc@91 1555 let
adamc@91 1556 val (t', tk, gs) = elabCon (env, denv) t
adamc@91 1557 in
adamc@91 1558 checkKind env t' tk ktype;
adamc@91 1559 (t', gs)
adamc@91 1560 end
adamc@91 1561 val (e', et, gs2) = elabExp (E.pushERel env x t', denv) e
adamc@91 1562 in
adamc@91 1563 ((L'.EAbs (x, t', et, e'), loc),
adamc@91 1564 (L'.TFun (t', et), loc),
adamc@228 1565 enD gs1 @ gs2)
adamc@91 1566 end
adamc@91 1567 | L.ECApp (e, c) =>
adamc@91 1568 let
adamc@91 1569 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1570 val (e', et, gs2) = elabHead (env, denv) e' et
adamc@91 1571 val (c', ck, gs3) = elabCon (env, denv) c
adamc@91 1572 val ((et', _), gs4) = hnormCon (env, denv) et
adamc@91 1573 in
adamc@91 1574 case et' of
adamc@91 1575 L'.CError => (eerror, cerror, [])
adamc@91 1576 | L'.TCFun (_, _, k, eb) =>
adamc@91 1577 let
adamc@91 1578 val () = checkKind env c' ck k
adamc@91 1579 val eb' = subConInCon (0, c') eb
adamc@91 1580 handle SynUnif => (expError env (Unif ("substitution", eb));
adamc@91 1581 cerror)
adamc@91 1582 in
adamc@228 1583 ((L'.ECApp (e', c'), loc), eb', gs1 @ gs2 @ enD gs3 @ enD gs4)
adamc@91 1584 end
adamc@91 1585
adamc@91 1586 | L'.CUnif _ =>
adamc@91 1587 (expError env (Unif ("application", et));
adamc@91 1588 (eerror, cerror, []))
adamc@91 1589
adamc@91 1590 | _ =>
adamc@91 1591 (expError env (WrongForm ("constructor function", e', et));
adamc@91 1592 (eerror, cerror, []))
adamc@91 1593 end
adamc@91 1594 | L.ECAbs (expl, x, k, e) =>
adamc@91 1595 let
adamc@91 1596 val expl' = elabExplicitness expl
adamc@91 1597 val k' = elabKind k
adamc@91 1598 val (e', et, gs) = elabExp (E.pushCRel env x k', D.enter denv) e
adamc@91 1599 in
adamc@91 1600 ((L'.ECAbs (expl', x, k', e'), loc),
adamc@91 1601 (L'.TCFun (expl', x, k', et), loc),
adamc@91 1602 gs)
adamc@91 1603 end
adamc@91 1604
adamc@91 1605 | L.EDisjoint (c1, c2, e) =>
adamc@91 1606 let
adamc@91 1607 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@91 1608 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@91 1609
adamc@91 1610 val ku1 = kunif loc
adamc@91 1611 val ku2 = kunif loc
adamc@91 1612
adamc@91 1613 val (denv', gs3) = D.assert env denv (c1', c2')
adamc@91 1614 val (e', t, gs4) = elabExp (env, denv') e
adamc@91 1615 in
adamc@91 1616 checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@91 1617 checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@91 1618
adamc@228 1619 (e', (L'.TDisjoint (c1', c2', t), loc), enD gs1 @ enD gs2 @ enD gs3 @ gs4)
adamc@91 1620 end
adamc@91 1621
adamc@91 1622 | L.ERecord xes =>
adamc@91 1623 let
adamc@91 1624 val (xes', gs) = ListUtil.foldlMap (fn ((x, e), gs) =>
adamc@91 1625 let
adamc@91 1626 val (x', xk, gs1) = elabCon (env, denv) x
adamc@91 1627 val (e', et, gs2) = elabExp (env, denv) e
adamc@91 1628 in
adamc@91 1629 checkKind env x' xk kname;
adamc@228 1630 ((x', e', et), enD gs1 @ gs2 @ gs)
adamc@91 1631 end)
adamc@91 1632 [] xes
adamc@91 1633
adamc@91 1634 val k = (L'.KType, loc)
adamc@91 1635
adamc@91 1636 fun prove (xets, gs) =
adamc@91 1637 case xets of
adamc@91 1638 [] => gs
adamc@91 1639 | (x, _, t) :: rest =>
adamc@91 1640 let
adamc@91 1641 val xc = (x, t)
adamc@91 1642 val r1 = (L'.CRecord (k, [xc]), loc)
adamc@91 1643 val gs = foldl (fn ((x', _, t'), gs) =>
adamc@91 1644 let
adamc@91 1645 val xc' = (x', t')
adamc@91 1646 val r2 = (L'.CRecord (k, [xc']), loc)
adamc@91 1647 in
adamc@91 1648 D.prove env denv (r1, r2, loc) @ gs
adamc@91 1649 end)
adamc@91 1650 gs rest
adamc@91 1651 in
adamc@91 1652 prove (rest, gs)
adamc@91 1653 end
adamc@228 1654
adamc@228 1655 val gsD = List.mapPartial (fn Disjoint d => SOME d | _ => NONE) gs
adamc@228 1656 val gsO = List.filter (fn Disjoint _ => false | _ => true) gs
adamc@91 1657 in
adamc@91 1658 ((L'.ERecord xes', loc),
adamc@91 1659 (L'.TRecord (L'.CRecord (ktype, map (fn (x', _, et) => (x', et)) xes'), loc), loc),
adamc@228 1660 enD (prove (xes', gsD)) @ gsO)
adamc@91 1661 end
adamc@91 1662
adamc@91 1663 | L.EField (e, c) =>
adamc@91 1664 let
adamc@91 1665 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1666 val (c', ck, gs2) = elabCon (env, denv) c
adamc@91 1667
adamc@91 1668 val ft = cunif (loc, ktype)
adamc@91 1669 val rest = cunif (loc, ktype_record)
adamc@91 1670 val first = (L'.CRecord (ktype, [(c', ft)]), loc)
adamc@91 1671
adamc@91 1672 val gs3 =
adamc@91 1673 checkCon (env, denv) e' et
adamc@91 1674 (L'.TRecord (L'.CConcat (first, rest), loc), loc)
adamc@91 1675 val gs4 = D.prove env denv (first, rest, loc)
adamc@91 1676 in
adamc@228 1677 ((L'.EField (e', c', {field = ft, rest = rest}), loc), ft, gs1 @ enD gs2 @ enD gs3 @ enD gs4)
adamc@91 1678 end
adamc@91 1679
adamc@149 1680 | L.ECut (e, c) =>
adamc@149 1681 let
adamc@149 1682 val (e', et, gs1) = elabExp (env, denv) e
adamc@149 1683 val (c', ck, gs2) = elabCon (env, denv) c
adamc@149 1684
adamc@149 1685 val ft = cunif (loc, ktype)
adamc@149 1686 val rest = cunif (loc, ktype_record)
adamc@149 1687 val first = (L'.CRecord (ktype, [(c', ft)]), loc)
adamc@149 1688
adamc@149 1689 val gs3 =
adamc@149 1690 checkCon (env, denv) e' et
adamc@149 1691 (L'.TRecord (L'.CConcat (first, rest), loc), loc)
adamc@149 1692 val gs4 = D.prove env denv (first, rest, loc)
adamc@149 1693 in
adamc@228 1694 ((L'.ECut (e', c', {field = ft, rest = rest}), loc), (L'.TRecord rest, loc),
adamc@228 1695 gs1 @ enD gs2 @ enD gs3 @ enD gs4)
adamc@149 1696 end
adamc@149 1697
adamc@91 1698 | L.EFold =>
adamc@91 1699 let
adamc@91 1700 val dom = kunif loc
adamc@91 1701 in
adamc@91 1702 ((L'.EFold dom, loc), foldType (dom, loc), [])
adamc@91 1703 end
adamc@170 1704
adamc@171 1705 | L.ECase (e, pes) =>
adamc@171 1706 let
adamc@171 1707 val (e', et, gs1) = elabExp (env, denv) e
adamc@171 1708 val result = cunif (loc, (L'.KType, loc))
adamc@171 1709 val (pes', gs) = ListUtil.foldlMap
adamc@171 1710 (fn ((p, e), gs) =>
adamc@171 1711 let
adamc@174 1712 val ((p', pt), (env, _)) = elabPat (p, (env, denv, SS.empty))
adamc@171 1713
adamc@171 1714 val gs1 = checkPatCon (env, denv) p' pt et
adamc@171 1715 val (e', et, gs2) = elabExp (env, denv) e
adamc@171 1716 val gs3 = checkCon (env, denv) e' et result
adamc@171 1717 in
adamc@228 1718 ((p', e'), enD gs1 @ gs2 @ enD gs3 @ gs)
adamc@171 1719 end)
adamc@171 1720 gs1 pes
adamc@172 1721
adamc@172 1722 val (total, gs') = exhaustive (env, denv, et, map #1 pes')
adamc@171 1723 in
adamc@172 1724 if total then
adamc@172 1725 ()
adamc@172 1726 else
adamc@172 1727 expError env (Inexhaustive loc);
adamc@172 1728
adamc@228 1729 ((L'.ECase (e', pes', {disc = et, result = result}), loc), result, enD gs' @ gs)
adamc@171 1730 end
adamc@91 1731 end
adamc@12 1732
adamc@12 1733
adamc@6 1734 datatype decl_error =
adamc@91 1735 KunifsRemain of L'.decl list
adamc@91 1736 | CunifsRemain of L'.decl list
adamc@91 1737
adamc@91 1738 fun lspan [] = ErrorMsg.dummySpan
adamc@91 1739 | lspan ((_, loc) :: _) = loc
adamc@6 1740
adamc@6 1741 fun declError env err =
adamc@6 1742 case err of
adamc@91 1743 KunifsRemain ds =>
adamc@91 1744 (ErrorMsg.errorAt (lspan ds) "Some kind unification variables are undetermined in declaration";
adamc@91 1745 eprefaces' [("Decl", p_list_sep PD.newline (p_decl env) ds)])
adamc@91 1746 | CunifsRemain ds =>
adamc@91 1747 (ErrorMsg.errorAt (lspan ds) "Some constructor unification variables are undetermined in declaration";
adamc@91 1748 eprefaces' [("Decl", p_list_sep PD.newline (p_decl env) ds)])
adamc@6 1749
adamc@31 1750 datatype sgn_error =
adamc@31 1751 UnboundSgn of ErrorMsg.span * string
adamc@31 1752 | UnmatchedSgi of L'.sgn_item
adamc@31 1753 | SgiWrongKind of L'.sgn_item * L'.kind * L'.sgn_item * L'.kind * kunify_error
adamc@31 1754 | SgiWrongCon of L'.sgn_item * L'.con * L'.sgn_item * L'.con * cunify_error
adamc@156 1755 | SgiMismatchedDatatypes of L'.sgn_item * L'.sgn_item * (L'.con * L'.con * cunify_error) option
adamc@41 1756 | SgnWrongForm of L'.sgn * L'.sgn
adamc@42 1757 | UnWhereable of L'.sgn * string
adamc@75 1758 | WhereWrongKind of L'.kind * L'.kind * kunify_error
adamc@58 1759 | NotIncludable of L'.sgn
adamc@62 1760 | DuplicateCon of ErrorMsg.span * string
adamc@62 1761 | DuplicateVal of ErrorMsg.span * string
adamc@62 1762 | DuplicateSgn of ErrorMsg.span * string
adamc@62 1763 | DuplicateStr of ErrorMsg.span * string
adamc@88 1764 | NotConstraintsable of L'.sgn
adamc@31 1765
adamc@31 1766 fun sgnError env err =
adamc@31 1767 case err of
adamc@31 1768 UnboundSgn (loc, s) =>
adamc@31 1769 ErrorMsg.errorAt loc ("Unbound signature variable " ^ s)
adamc@31 1770 | UnmatchedSgi (sgi as (_, loc)) =>
adamc@31 1771 (ErrorMsg.errorAt loc "Unmatched signature item";
adamc@31 1772 eprefaces' [("Item", p_sgn_item env sgi)])
adamc@31 1773 | SgiWrongKind (sgi1, k1, sgi2, k2, kerr) =>
adamc@31 1774 (ErrorMsg.errorAt (#2 sgi1) "Kind unification failure in signature matching:";
adamc@59 1775 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59 1776 ("Need", p_sgn_item env sgi2),
adamc@31 1777 ("Kind 1", p_kind k1),
adamc@31 1778 ("Kind 2", p_kind k2)];
adamc@31 1779 kunifyError kerr)
adamc@31 1780 | SgiWrongCon (sgi1, c1, sgi2, c2, cerr) =>
adamc@31 1781 (ErrorMsg.errorAt (#2 sgi1) "Constructor unification failure in signature matching:";
adamc@59 1782 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59 1783 ("Need", p_sgn_item env sgi2),
adamc@31 1784 ("Con 1", p_con env c1),
adamc@31 1785 ("Con 2", p_con env c2)];
adamc@31 1786 cunifyError env cerr)
adamc@156 1787 | SgiMismatchedDatatypes (sgi1, sgi2, cerro) =>
adamc@156 1788 (ErrorMsg.errorAt (#2 sgi1) "Mismatched 'datatype' specifications:";
adamc@156 1789 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@156 1790 ("Need", p_sgn_item env sgi2)];
adamc@156 1791 Option.app (fn (c1, c2, ue) =>
adamc@156 1792 (eprefaces "Unification error"
adamc@156 1793 [("Con 1", p_con env c1),
adamc@156 1794 ("Con 2", p_con env c2)];
adamc@156 1795 cunifyError env ue)) cerro)
adamc@41 1796 | SgnWrongForm (sgn1, sgn2) =>
adamc@41 1797 (ErrorMsg.errorAt (#2 sgn1) "Incompatible signatures:";
adamc@41 1798 eprefaces' [("Sig 1", p_sgn env sgn1),
adamc@41 1799 ("Sig 2", p_sgn env sgn2)])
adamc@42 1800 | UnWhereable (sgn, x) =>
adamc@42 1801 (ErrorMsg.errorAt (#2 sgn) "Unavailable field for 'where'";
adamc@42 1802 eprefaces' [("Signature", p_sgn env sgn),
adamc@42 1803 ("Field", PD.string x)])
adamc@75 1804 | WhereWrongKind (k1, k2, kerr) =>
adamc@75 1805 (ErrorMsg.errorAt (#2 k1) "Wrong kind for 'where'";
adamc@75 1806 eprefaces' [("Have", p_kind k1),
adamc@75 1807 ("Need", p_kind k2)];
adamc@75 1808 kunifyError kerr)
adamc@58 1809 | NotIncludable sgn =>
adamc@58 1810 (ErrorMsg.errorAt (#2 sgn) "Invalid signature to 'include'";
adamc@58 1811 eprefaces' [("Signature", p_sgn env sgn)])
adamc@62 1812 | DuplicateCon (loc, s) =>
adamc@62 1813 ErrorMsg.errorAt loc ("Duplicate constructor " ^ s ^ " in signature")
adamc@62 1814 | DuplicateVal (loc, s) =>
adamc@62 1815 ErrorMsg.errorAt loc ("Duplicate value " ^ s ^ " in signature")
adamc@62 1816 | DuplicateSgn (loc, s) =>
adamc@62 1817 ErrorMsg.errorAt loc ("Duplicate signature " ^ s ^ " in signature")
adamc@62 1818 | DuplicateStr (loc, s) =>
adamc@62 1819 ErrorMsg.errorAt loc ("Duplicate structure " ^ s ^ " in signature")
adamc@88 1820 | NotConstraintsable sgn =>
adamc@88 1821 (ErrorMsg.errorAt (#2 sgn) "Invalid signature for 'open constraints'";
adamc@88 1822 eprefaces' [("Signature", p_sgn env sgn)])
adamc@31 1823
adamc@31 1824 datatype str_error =
adamc@31 1825 UnboundStr of ErrorMsg.span * string
adamc@44 1826 | NotFunctor of L'.sgn
adamc@46 1827 | FunctorRebind of ErrorMsg.span
adamc@61 1828 | UnOpenable of L'.sgn
adamc@75 1829 | NotType of L'.kind * (L'.kind * L'.kind * kunify_error)
adamc@156 1830 | DuplicateConstructor of string * ErrorMsg.span
adamc@158 1831 | NotDatatype of ErrorMsg.span
adamc@31 1832
adamc@31 1833 fun strError env err =
adamc@31 1834 case err of
adamc@31 1835 UnboundStr (loc, s) =>
adamc@31 1836 ErrorMsg.errorAt loc ("Unbound structure variable " ^ s)
adamc@44 1837 | NotFunctor sgn =>
adamc@44 1838 (ErrorMsg.errorAt (#2 sgn) "Application of non-functor";
adamc@44 1839 eprefaces' [("Signature", p_sgn env sgn)])
adamc@46 1840 | FunctorRebind loc =>
adamc@46 1841 ErrorMsg.errorAt loc "Attempt to rebind functor"
adamc@61 1842 | UnOpenable sgn =>
adamc@61 1843 (ErrorMsg.errorAt (#2 sgn) "Un-openable structure";
adamc@61 1844 eprefaces' [("Signature", p_sgn env sgn)])
adamc@75 1845 | NotType (k, (k1, k2, ue)) =>
adamc@75 1846 (ErrorMsg.errorAt (#2 k) "'val' type kind is not 'Type'";
adamc@75 1847 eprefaces' [("Kind", p_kind k),
adamc@75 1848 ("Subkind 1", p_kind k1),
adamc@75 1849 ("Subkind 2", p_kind k2)];
adamc@75 1850 kunifyError ue)
adamc@156 1851 | DuplicateConstructor (x, loc) =>
adamc@156 1852 ErrorMsg.errorAt loc ("Duplicate datatype constructor " ^ x)
adamc@158 1853 | NotDatatype loc =>
adamc@158 1854 ErrorMsg.errorAt loc "Trying to import non-datatype as a datatype"
adamc@31 1855
adamc@42 1856 val hnormSgn = E.hnormSgn
adamc@31 1857
adamc@210 1858 fun tableOf () = (L'.CModProj (!basis_r, [], "sql_table"), ErrorMsg.dummySpan)
adamc@205 1859
adamc@88 1860 fun elabSgn_item ((sgi, loc), (env, denv, gs)) =
adamc@76 1861 case sgi of
adamc@76 1862 L.SgiConAbs (x, k) =>
adamc@76 1863 let
adamc@76 1864 val k' = elabKind k
adamc@31 1865
adamc@76 1866 val (env', n) = E.pushCNamed env x k' NONE
adamc@76 1867 in
adamc@88 1868 ([(L'.SgiConAbs (x, n, k'), loc)], (env', denv, gs))
adamc@76 1869 end
adamc@31 1870
adamc@76 1871 | L.SgiCon (x, ko, c) =>
adamc@76 1872 let
adamc@76 1873 val k' = case ko of
adamc@76 1874 NONE => kunif loc
adamc@76 1875 | SOME k => elabKind k
adamc@31 1876
adamc@83 1877 val (c', ck, gs') = elabCon (env, denv) c
adamc@76 1878 val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@76 1879 in
adamc@76 1880 checkKind env c' ck k';
adamc@31 1881
adamc@88 1882 ([(L'.SgiCon (x, n, k', c'), loc)], (env', denv, gs' @ gs))
adamc@76 1883 end
adamc@31 1884
adamc@191 1885 | L.SgiDatatype (x, xs, xcs) =>
adamc@157 1886 let
adamc@157 1887 val k = (L'.KType, loc)
adamc@191 1888 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 1889 val (env, n) = E.pushCNamed env x k' NONE
adamc@157 1890 val t = (L'.CNamed n, loc)
adamc@194 1891 val nxs = length xs - 1
adamc@194 1892 val t = ListUtil.foldli (fn (i, _, t) => (L'.CApp (t, (L'.CRel (nxs - i), loc)), loc)) t xs
adamc@157 1893
adamc@157 1894 val (xcs, (used, env, gs)) =
adamc@157 1895 ListUtil.foldlMap
adamc@157 1896 (fn ((x, to), (used, env, gs)) =>
adamc@157 1897 let
adamc@157 1898 val (to, t, gs') = case to of
adamc@157 1899 NONE => (NONE, t, gs)
adamc@157 1900 | SOME t' =>
adamc@157 1901 let
adamc@157 1902 val (t', tk, gs') = elabCon (env, denv) t'
adamc@157 1903 in
adamc@157 1904 checkKind env t' tk k;
adamc@157 1905 (SOME t', (L'.TFun (t', t), loc), gs' @ gs)
adamc@157 1906 end
adamc@191 1907 val t = foldl (fn (x, t) => (L'.TCFun (L'.Implicit, x, k, t), loc)) t xs
adamc@157 1908
adamc@157 1909 val (env, n') = E.pushENamed env x t
adamc@157 1910 in
adamc@157 1911 if SS.member (used, x) then
adamc@157 1912 strError env (DuplicateConstructor (x, loc))
adamc@157 1913 else
adamc@157 1914 ();
adamc@157 1915 ((x, n', to), (SS.add (used, x), env, gs'))
adamc@157 1916 end)
adamc@157 1917 (SS.empty, env, []) xcs
adamc@191 1918
adamc@191 1919 val env = E.pushDatatype env n xs xcs
adamc@157 1920 in
adamc@191 1921 ([(L'.SgiDatatype (x, n, xs, xcs), loc)], (env, denv, gs))
adamc@157 1922 end
adamc@156 1923
adamc@158 1924 | L.SgiDatatypeImp (_, [], _) => raise Fail "Empty SgiDatatypeImp"
adamc@158 1925
adamc@158 1926 | L.SgiDatatypeImp (x, m1 :: ms, s) =>
adamc@158 1927 (case E.lookupStr env m1 of
adamc@158 1928 NONE => (strError env (UnboundStr (loc, m1));
adamc@158 1929 ([], (env, denv, gs)))
adamc@158 1930 | SOME (n, sgn) =>
adamc@158 1931 let
adamc@158 1932 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@158 1933 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@158 1934 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@158 1935 (strerror, sgnerror))
adamc@158 1936 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@158 1937 ((L'.StrVar n, loc), sgn) ms
adamc@158 1938 in
adamc@161 1939 case hnormCon (env, denv) (L'.CModProj (n, ms, s), loc) of
adamc@161 1940 ((L'.CModProj (n, ms, s), _), gs) =>
adamc@161 1941 (case E.projectDatatype env {sgn = sgn, str = str, field = s} of
adamc@161 1942 NONE => (conError env (UnboundDatatype (loc, s));
adamc@161 1943 ([], (env, denv, gs)))
adamc@191 1944 | SOME (xs, xncs) =>
adamc@161 1945 let
adamc@161 1946 val k = (L'.KType, loc)
adamc@191 1947 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 1948
adamc@161 1949 val t = (L'.CModProj (n, ms, s), loc)
adamc@191 1950 val (env, n') = E.pushCNamed env x k' (SOME t)
adamc@191 1951 val env = E.pushDatatype env n' xs xncs
adamc@158 1952
adamc@161 1953 val t = (L'.CNamed n', loc)
adamc@161 1954 val env = foldl (fn ((x, n, to), env) =>
adamc@161 1955 let
adamc@161 1956 val t = case to of
adamc@161 1957 NONE => t
adamc@161 1958 | SOME t' => (L'.TFun (t', t), loc)
adamc@191 1959
adamc@191 1960 val t = foldr (fn (x, t) =>
adamc@191 1961 (L'.TCFun (L'.Implicit, x, k, t), loc))
adamc@191 1962 t xs
adamc@161 1963 in
adamc@161 1964 E.pushENamedAs env x n t
adamc@161 1965 end) env xncs
adamc@161 1966 in
adamc@191 1967 ([(L'.SgiDatatypeImp (x, n', n, ms, s, xs, xncs), loc)], (env, denv, gs))
adamc@161 1968 end)
adamc@161 1969 | _ => (strError env (NotDatatype loc);
adamc@161 1970 ([], (env, denv, [])))
adamc@158 1971 end)
adamc@156 1972
adamc@76 1973 | L.SgiVal (x, c) =>
adamc@76 1974 let
adamc@83 1975 val (c', ck, gs') = elabCon (env, denv) c
adamc@31 1976
adamc@76 1977 val (env', n) = E.pushENamed env x c'
adamc@218 1978 val (c', gs'') = normClassConstraint (env, denv) c'
adamc@76 1979 in
adamc@76 1980 (unifyKinds ck ktype
adamc@76 1981 handle KUnify ue => strError env (NotType (ck, ue)));
adamc@31 1982
adamc@218 1983 ([(L'.SgiVal (x, n, c'), loc)], (env', denv, gs' @ gs'' @ gs))
adamc@76 1984 end
adamc@31 1985
adamc@76 1986 | L.SgiStr (x, sgn) =>
adamc@76 1987 let
adamc@83 1988 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 1989 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 1990 in
adamc@88 1991 ([(L'.SgiStr (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 1992 end
adamc@31 1993
adamc@76 1994 | L.SgiSgn (x, sgn) =>
adamc@76 1995 let
adamc@83 1996 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 1997 val (env', n) = E.pushSgnNamed env x sgn'
adamc@76 1998 in
adamc@88 1999 ([(L'.SgiSgn (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 2000 end
adamc@31 2001
adamc@76 2002 | L.SgiInclude sgn =>
adamc@76 2003 let
adamc@83 2004 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2005 in
adamc@76 2006 case #1 (hnormSgn env sgn') of
adamc@76 2007 L'.SgnConst sgis =>
adamc@88 2008 (sgis, (foldl (fn (sgi, env) => E.sgiBinds env sgi) env sgis, denv, gs' @ gs))
adamc@76 2009 | _ => (sgnError env (NotIncludable sgn');
adamc@88 2010 ([], (env, denv, [])))
adamc@88 2011 end
adamc@88 2012
adamc@88 2013 | L.SgiConstraint (c1, c2) =>
adamc@88 2014 let
adamc@88 2015 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@88 2016 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@88 2017
adamc@90 2018 val (denv, gs3) = D.assert env denv (c1', c2')
adamc@88 2019 in
adamc@88 2020 checkKind env c1' k1 (L'.KRecord (kunif loc), loc);
adamc@88 2021 checkKind env c2' k2 (L'.KRecord (kunif loc), loc);
adamc@88 2022
adamc@90 2023 ([(L'.SgiConstraint (c1', c2'), loc)], (env, denv, gs1 @ gs2 @ gs3))
adamc@76 2024 end
adamc@31 2025
adamc@203 2026 | L.SgiTable (x, c) =>
adamc@203 2027 let
adamc@203 2028 val (c', k, gs) = elabCon (env, denv) c
adamc@210 2029 val (env, n) = E.pushENamed env x (L'.CApp (tableOf (), c'), loc)
adamc@203 2030 in
adamc@203 2031 checkKind env c' k (L'.KRecord (L'.KType, loc), loc);
adamc@210 2032 ([(L'.SgiTable (!basis_r, x, n, c'), loc)], (env, denv, gs))
adamc@203 2033 end
adamc@203 2034
adamc@211 2035 | L.SgiClassAbs x =>
adamc@211 2036 let
adamc@211 2037 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2038 val (env, n) = E.pushCNamed env x k NONE
adamc@211 2039 val env = E.pushClass env n
adamc@211 2040 in
adamc@211 2041 ([(L'.SgiClassAbs (x, n), loc)], (env, denv, []))
adamc@211 2042 end
adamc@211 2043
adamc@211 2044 | L.SgiClass (x, c) =>
adamc@211 2045 let
adamc@211 2046 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2047 val (c', ck, gs) = elabCon (env, denv) c
adamc@211 2048 val (env, n) = E.pushCNamed env x k (SOME c')
adamc@211 2049 val env = E.pushClass env n
adamc@211 2050 in
adamc@211 2051 checkKind env c' ck k;
adamc@211 2052 ([(L'.SgiClass (x, n, c'), loc)], (env, denv, []))
adamc@211 2053 end
adamc@211 2054
adamc@83 2055 and elabSgn (env, denv) (sgn, loc) =
adamc@31 2056 case sgn of
adamc@31 2057 L.SgnConst sgis =>
adamc@31 2058 let
adamc@88 2059 val (sgis', (_, _, gs)) = ListUtil.foldlMapConcat elabSgn_item (env, denv, []) sgis
adamc@62 2060
adamc@62 2061 val _ = foldl (fn ((sgi, loc), (cons, vals, sgns, strs)) =>
adamc@62 2062 case sgi of
adamc@62 2063 L'.SgiConAbs (x, _, _) =>
adamc@62 2064 (if SS.member (cons, x) then
adamc@62 2065 sgnError env (DuplicateCon (loc, x))
adamc@62 2066 else
adamc@62 2067 ();
adamc@62 2068 (SS.add (cons, x), vals, sgns, strs))
adamc@62 2069 | L'.SgiCon (x, _, _, _) =>
adamc@62 2070 (if SS.member (cons, x) then
adamc@62 2071 sgnError env (DuplicateCon (loc, x))
adamc@62 2072 else
adamc@62 2073 ();
adamc@62 2074 (SS.add (cons, x), vals, sgns, strs))
adamc@191 2075 | L'.SgiDatatype (x, _, _, xncs) =>
adamc@156 2076 let
adamc@156 2077 val vals = foldl (fn ((x, _, _), vals) =>
adamc@156 2078 (if SS.member (vals, x) then
adamc@156 2079 sgnError env (DuplicateVal (loc, x))
adamc@156 2080 else
adamc@156 2081 ();
adamc@156 2082 SS.add (vals, x)))
adamc@156 2083 vals xncs
adamc@156 2084 in
adamc@156 2085 if SS.member (cons, x) then
adamc@156 2086 sgnError env (DuplicateCon (loc, x))
adamc@156 2087 else
adamc@156 2088 ();
adamc@156 2089 (SS.add (cons, x), vals, sgns, strs)
adamc@156 2090 end
adamc@191 2091 | L'.SgiDatatypeImp (x, _, _, _, _, _, _) =>
adamc@156 2092 (if SS.member (cons, x) then
adamc@156 2093 sgnError env (DuplicateCon (loc, x))
adamc@156 2094 else
adamc@156 2095 ();
adamc@156 2096 (SS.add (cons, x), vals, sgns, strs))
adamc@62 2097 | L'.SgiVal (x, _, _) =>
adamc@62 2098 (if SS.member (vals, x) then
adamc@62 2099 sgnError env (DuplicateVal (loc, x))
adamc@62 2100 else
adamc@62 2101 ();
adamc@62 2102 (cons, SS.add (vals, x), sgns, strs))
adamc@62 2103 | L'.SgiSgn (x, _, _) =>
adamc@62 2104 (if SS.member (sgns, x) then
adamc@62 2105 sgnError env (DuplicateSgn (loc, x))
adamc@62 2106 else
adamc@62 2107 ();
adamc@62 2108 (cons, vals, SS.add (sgns, x), strs))
adamc@62 2109 | L'.SgiStr (x, _, _) =>
adamc@62 2110 (if SS.member (strs, x) then
adamc@62 2111 sgnError env (DuplicateStr (loc, x))
adamc@62 2112 else
adamc@62 2113 ();
adamc@88 2114 (cons, vals, sgns, SS.add (strs, x)))
adamc@203 2115 | L'.SgiConstraint _ => (cons, vals, sgns, strs)
adamc@205 2116 | L'.SgiTable (_, x, _, _) =>
adamc@203 2117 (if SS.member (vals, x) then
adamc@203 2118 sgnError env (DuplicateVal (loc, x))
adamc@203 2119 else
adamc@203 2120 ();
adamc@211 2121 (cons, SS.add (vals, x), sgns, strs))
adamc@211 2122 | L'.SgiClassAbs (x, _) =>
adamc@211 2123 (if SS.member (cons, x) then
adamc@211 2124 sgnError env (DuplicateCon (loc, x))
adamc@211 2125 else
adamc@211 2126 ();
adamc@211 2127 (SS.add (cons, x), vals, sgns, strs))
adamc@211 2128 | L'.SgiClass (x, _, _) =>
adamc@211 2129 (if SS.member (cons, x) then
adamc@211 2130 sgnError env (DuplicateCon (loc, x))
adamc@211 2131 else
adamc@211 2132 ();
adamc@211 2133 (SS.add (cons, x), vals, sgns, strs)))
adamc@62 2134 (SS.empty, SS.empty, SS.empty, SS.empty) sgis'
adamc@31 2135 in
adamc@83 2136 ((L'.SgnConst sgis', loc), gs)
adamc@31 2137 end
adamc@31 2138 | L.SgnVar x =>
adamc@31 2139 (case E.lookupSgn env x of
adamc@31 2140 NONE =>
adamc@31 2141 (sgnError env (UnboundSgn (loc, x));
adamc@83 2142 ((L'.SgnError, loc), []))
adamc@83 2143 | SOME (n, sgis) => ((L'.SgnVar n, loc), []))
adamc@41 2144 | L.SgnFun (m, dom, ran) =>
adamc@41 2145 let
adamc@83 2146 val (dom', gs1) = elabSgn (env, denv) dom
adamc@41 2147 val (env', n) = E.pushStrNamed env m dom'
adamc@83 2148 val (ran', gs2) = elabSgn (env', denv) ran
adamc@41 2149 in
adamc@83 2150 ((L'.SgnFun (m, n, dom', ran'), loc), gs1 @ gs2)
adamc@41 2151 end
adamc@42 2152 | L.SgnWhere (sgn, x, c) =>
adamc@42 2153 let
adamc@83 2154 val (sgn', ds1) = elabSgn (env, denv) sgn
adamc@83 2155 val (c', ck, ds2) = elabCon (env, denv) c
adamc@42 2156 in
adamc@42 2157 case #1 (hnormSgn env sgn') of
adamc@83 2158 L'.SgnError => (sgnerror, [])
adamc@42 2159 | L'.SgnConst sgis =>
adamc@75 2160 if List.exists (fn (L'.SgiConAbs (x', _, k), _) =>
adamc@75 2161 x' = x andalso
adamc@75 2162 (unifyKinds k ck
adamc@75 2163 handle KUnify x => sgnError env (WhereWrongKind x);
adamc@42 2164 true)
adamc@42 2165 | _ => false) sgis then
adamc@83 2166 ((L'.SgnWhere (sgn', x, c'), loc), ds1 @ ds2)
adamc@42 2167 else
adamc@42 2168 (sgnError env (UnWhereable (sgn', x));
adamc@83 2169 (sgnerror, []))
adamc@42 2170 | _ => (sgnError env (UnWhereable (sgn', x));
adamc@83 2171 (sgnerror, []))
adamc@42 2172 end
adamc@59 2173 | L.SgnProj (m, ms, x) =>
adamc@59 2174 (case E.lookupStr env m of
adamc@59 2175 NONE => (strError env (UnboundStr (loc, m));
adamc@83 2176 (sgnerror, []))
adamc@59 2177 | SOME (n, sgn) =>
adamc@59 2178 let
adamc@59 2179 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@59 2180 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@59 2181 NONE => (strError env (UnboundStr (loc, m));
adamc@59 2182 (strerror, sgnerror))
adamc@59 2183 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@59 2184 ((L'.StrVar n, loc), sgn) ms
adamc@59 2185 in
adamc@59 2186 case E.projectSgn env {sgn = sgn, str = str, field = x} of
adamc@59 2187 NONE => (sgnError env (UnboundSgn (loc, x));
adamc@83 2188 (sgnerror, []))
adamc@83 2189 | SOME _ => ((L'.SgnProj (n, ms, x), loc), [])
adamc@59 2190 end)
adamc@59 2191
adamc@31 2192
adamc@66 2193 fun selfify env {str, strs, sgn} =
adamc@66 2194 case #1 (hnormSgn env sgn) of
adamc@66 2195 L'.SgnError => sgn
adamc@66 2196 | L'.SgnVar _ => sgn
adamc@66 2197
adamc@66 2198 | L'.SgnConst sgis =>
adamc@66 2199 (L'.SgnConst (map (fn (L'.SgiConAbs (x, n, k), loc) =>
adamc@66 2200 (L'.SgiCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc)
adamc@191 2201 | (L'.SgiDatatype (x, n, xs, xncs), loc) =>
adamc@191 2202 (L'.SgiDatatypeImp (x, n, str, strs, x, xs, xncs), loc)
adamc@218 2203 | (L'.SgiClassAbs (x, n), loc) =>
adamc@218 2204 (L'.SgiClass (x, n, (L'.CModProj (str, strs, x), loc)), loc)
adamc@66 2205 | (L'.SgiStr (x, n, sgn), loc) =>
adamc@66 2206 (L'.SgiStr (x, n, selfify env {str = str, strs = strs @ [x], sgn = sgn}), loc)
adamc@66 2207 | x => x) sgis), #2 sgn)
adamc@66 2208 | L'.SgnFun _ => sgn
adamc@66 2209 | L'.SgnWhere _ => sgn
adamc@66 2210 | L'.SgnProj (m, ms, x) =>
adamc@66 2211 case E.projectSgn env {str = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66 2212 (L'.StrVar m, #2 sgn) ms,
adamc@66 2213 sgn = #2 (E.lookupStrNamed env m),
adamc@66 2214 field = x} of
adamc@66 2215 NONE => raise Fail "Elaborate.selfify: projectSgn returns NONE"
adamc@66 2216 | SOME sgn => selfify env {str = str, strs = strs, sgn = sgn}
adamc@66 2217
adamc@66 2218 fun selfifyAt env {str, sgn} =
adamc@66 2219 let
adamc@66 2220 fun self (str, _) =
adamc@66 2221 case str of
adamc@66 2222 L'.StrVar x => SOME (x, [])
adamc@66 2223 | L'.StrProj (str, x) =>
adamc@66 2224 (case self str of
adamc@66 2225 NONE => NONE
adamc@66 2226 | SOME (m, ms) => SOME (m, ms @ [x]))
adamc@66 2227 | _ => NONE
adamc@66 2228 in
adamc@66 2229 case self str of
adamc@66 2230 NONE => sgn
adamc@66 2231 | SOME (str, strs) => selfify env {sgn = sgn, str = str, strs = strs}
adamc@66 2232 end
adamc@66 2233
adamc@88 2234 fun dopen (env, denv) {str, strs, sgn} =
adamc@66 2235 let
adamc@66 2236 val m = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66 2237 (L'.StrVar str, #2 sgn) strs
adamc@66 2238 in
adamc@66 2239 case #1 (hnormSgn env sgn) of
adamc@66 2240 L'.SgnConst sgis =>
adamc@88 2241 ListUtil.foldlMap (fn ((sgi, loc), (env', denv')) =>
adamc@162 2242 let
adamc@162 2243 val d =
adamc@162 2244 case sgi of
adamc@162 2245 L'.SgiConAbs (x, n, k) =>
adamc@162 2246 let
adamc@162 2247 val c = (L'.CModProj (str, strs, x), loc)
adamc@162 2248 in
adamc@162 2249 (L'.DCon (x, n, k, c), loc)
adamc@162 2250 end
adamc@162 2251 | L'.SgiCon (x, n, k, c) =>
adamc@162 2252 (L'.DCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc)
adamc@191 2253 | L'.SgiDatatype (x, n, xs, xncs) =>
adamc@191 2254 (L'.DDatatypeImp (x, n, str, strs, x, xs, xncs), loc)
adamc@191 2255 | L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs) =>
adamc@191 2256 (L'.DDatatypeImp (x, n, m1, ms, x', xs, xncs), loc)
adamc@162 2257 | L'.SgiVal (x, n, t) =>
adamc@162 2258 (L'.DVal (x, n, t, (L'.EModProj (str, strs, x), loc)), loc)
adamc@162 2259 | L'.SgiStr (x, n, sgn) =>
adamc@162 2260 (L'.DStr (x, n, sgn, (L'.StrProj (m, x), loc)), loc)
adamc@162 2261 | L'.SgiSgn (x, n, sgn) =>
adamc@162 2262 (L'.DSgn (x, n, (L'.SgnProj (str, strs, x), loc)), loc)
adamc@162 2263 | L'.SgiConstraint (c1, c2) =>
adamc@162 2264 (L'.DConstraint (c1, c2), loc)
adamc@205 2265 | L'.SgiTable (_, x, n, c) =>
adamc@210 2266 (L'.DVal (x, n, (L'.CApp (tableOf (), c), loc),
adamc@203 2267 (L'.EModProj (str, strs, x), loc)), loc)
adamc@211 2268 | L'.SgiClassAbs (x, n) =>
adamc@211 2269 let
adamc@211 2270 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2271 val c = (L'.CModProj (str, strs, x), loc)
adamc@211 2272 in
adamc@211 2273 (L'.DCon (x, n, k, c), loc)
adamc@211 2274 end
adamc@211 2275 | L'.SgiClass (x, n, _) =>
adamc@211 2276 let
adamc@211 2277 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2278 val c = (L'.CModProj (str, strs, x), loc)
adamc@211 2279 in
adamc@211 2280 (L'.DCon (x, n, k, c), loc)
adamc@211 2281 end
adamc@162 2282 in
adamc@162 2283 (d, (E.declBinds env' d, denv'))
adamc@162 2284 end)
adamc@88 2285 (env, denv) sgis
adamc@66 2286 | _ => (strError env (UnOpenable sgn);
adamc@88 2287 ([], (env, denv)))
adamc@66 2288 end
adamc@66 2289
adamc@88 2290 fun dopenConstraints (loc, env, denv) {str, strs} =
adamc@88 2291 case E.lookupStr env str of
adamc@88 2292 NONE => (strError env (UnboundStr (loc, str));
adamc@88 2293 denv)
adamc@88 2294 | SOME (n, sgn) =>
adamc@88 2295 let
adamc@88 2296 val (st, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@88 2297 case E.projectStr env {str = str, sgn = sgn, field = m} of
adamc@88 2298 NONE => (strError env (UnboundStr (loc, m));
adamc@88 2299 (strerror, sgnerror))
adamc@88 2300 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@88 2301 ((L'.StrVar n, loc), sgn) strs
adamc@88 2302
adamc@88 2303 val cso = E.projectConstraints env {sgn = sgn, str = st}
adamc@88 2304
adamc@88 2305 val denv = case cso of
adamc@88 2306 NONE => (strError env (UnboundStr (loc, str));
adamc@88 2307 denv)
adamc@90 2308 | SOME cs => foldl (fn ((c1, c2), denv) =>
adamc@90 2309 let
adamc@90 2310 val (denv, gs) = D.assert env denv (c1, c2)
adamc@90 2311 in
adamc@90 2312 case gs of
adamc@90 2313 [] => ()
adamc@90 2314 | _ => raise Fail "dopenConstraints: Sub-constraints remain";
adamc@90 2315
adamc@90 2316 denv
adamc@90 2317 end) denv cs
adamc@88 2318 in
adamc@88 2319 denv
adamc@88 2320 end
adamc@88 2321
adamc@31 2322 fun sgiOfDecl (d, loc) =
adamc@31 2323 case d of
adamc@123 2324 L'.DCon (x, n, k, c) => [(L'.SgiCon (x, n, k, c), loc)]
adamc@156 2325 | L'.DDatatype x => [(L'.SgiDatatype x, loc)]
adamc@156 2326 | L'.DDatatypeImp x => [(L'.SgiDatatypeImp x, loc)]
adamc@123 2327 | L'.DVal (x, n, t, _) => [(L'.SgiVal (x, n, t), loc)]
adamc@123 2328 | L'.DValRec vis => map (fn (x, n, t, _) => (L'.SgiVal (x, n, t), loc)) vis
adamc@123 2329 | L'.DSgn (x, n, sgn) => [(L'.SgiSgn (x, n, sgn), loc)]
adamc@123 2330 | L'.DStr (x, n, sgn, _) => [(L'.SgiStr (x, n, sgn), loc)]
adamc@123 2331 | L'.DFfiStr (x, n, sgn) => [(L'.SgiStr (x, n, sgn), loc)]
adamc@123 2332 | L'.DConstraint cs => [(L'.SgiConstraint cs, loc)]
adamc@123 2333 | L'.DExport _ => []
adamc@205 2334 | L'.DTable (tn, x, n, c) => [(L'.SgiTable (tn, x, n, c), loc)]
adamc@213 2335 | L'.DClass (x, n, c) => [(L'.SgiClass (x, n, c), loc)]
adamc@88 2336
adamc@88 2337 fun sgiBindsD (env, denv) (sgi, _) =
adamc@88 2338 case sgi of
adamc@90 2339 L'.SgiConstraint (c1, c2) =>
adamc@90 2340 (case D.assert env denv (c1, c2) of
adamc@90 2341 (denv, []) => denv
adamc@90 2342 | _ => raise Fail "sgiBindsD: Sub-constraints remain")
adamc@88 2343 | _ => denv
adamc@31 2344
adamc@86 2345 fun subSgn (env, denv) sgn1 (sgn2 as (_, loc2)) =
adamc@35 2346 case (#1 (hnormSgn env sgn1), #1 (hnormSgn env sgn2)) of
adamc@31 2347 (L'.SgnError, _) => ()
adamc@31 2348 | (_, L'.SgnError) => ()
adamc@31 2349
adamc@31 2350 | (L'.SgnConst sgis1, L'.SgnConst sgis2) =>
adamc@31 2351 let
adamc@156 2352 fun folder (sgi2All as (sgi, loc), (env, denv)) =
adamc@31 2353 let
adamc@31 2354 fun seek p =
adamc@31 2355 let
adamc@88 2356 fun seek (env, denv) ls =
adamc@31 2357 case ls of
adamc@31 2358 [] => (sgnError env (UnmatchedSgi sgi2All);
adamc@88 2359 (env, denv))
adamc@31 2360 | h :: t =>
adamc@31 2361 case p h of
adamc@88 2362 NONE => seek (E.sgiBinds env h, sgiBindsD (env, denv) h) t
adamc@88 2363 | SOME envs => envs
adamc@31 2364 in
adamc@88 2365 seek (env, denv) sgis1
adamc@31 2366 end
adamc@31 2367 in
adamc@31 2368 case sgi of
adamc@31 2369 L'.SgiConAbs (x, n2, k2) =>
adamc@31 2370 seek (fn sgi1All as (sgi1, _) =>
adamc@31 2371 let
adamc@41 2372 fun found (x', n1, k1, co1) =
adamc@41 2373 if x = x' then
adamc@41 2374 let
adamc@41 2375 val () = unifyKinds k1 k2
adamc@41 2376 handle KUnify (k1, k2, err) =>
adamc@41 2377 sgnError env (SgiWrongKind (sgi1All, k1, sgi2All, k2, err))
adamc@41 2378 val env = E.pushCNamedAs env x n1 k1 co1
adamc@41 2379 in
adamc@41 2380 SOME (if n1 = n2 then
adamc@41 2381 env
adamc@41 2382 else
adamc@88 2383 E.pushCNamedAs env x n2 k2 (SOME (L'.CNamed n1, loc2)),
adamc@88 2384 denv)
adamc@41 2385 end
adamc@41 2386 else
adamc@41 2387 NONE
adamc@31 2388 in
adamc@31 2389 case sgi1 of
adamc@41 2390 L'.SgiConAbs (x', n1, k1) => found (x', n1, k1, NONE)
adamc@41 2391 | L'.SgiCon (x', n1, k1, c1) => found (x', n1, k1, SOME c1)
adamc@191 2392 | L'.SgiDatatype (x', n1, xs, _) =>
adamc@191 2393 let
adamc@191 2394 val k = (L'.KType, loc)
adamc@191 2395 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 2396 in
adamc@191 2397 found (x', n1, k', NONE)
adamc@191 2398 end
adamc@191 2399 | L'.SgiDatatypeImp (x', n1, m1, ms, s, xs, _) =>
adamc@191 2400 let
adamc@191 2401 val k = (L'.KType, loc)
adamc@191 2402 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 2403 in
adamc@191 2404 found (x', n1, k', SOME (L'.CModProj (m1, ms, s), loc))
adamc@191 2405 end
adamc@211 2406 | L'.SgiClassAbs (x', n1) => found (x', n1,
adamc@218 2407 (L'.KArrow ((L'.KType, loc),
adamc@218 2408 (L'.KType, loc)), loc),
adamc@218 2409 NONE)
adamc@211 2410 | L'.SgiClass (x', n1, c) => found (x', n1,
adamc@211 2411 (L'.KArrow ((L'.KType, loc),
adamc@211 2412 (L'.KType, loc)), loc),
adamc@211 2413 SOME c)
adamc@31 2414 | _ => NONE
adamc@31 2415 end)
adamc@31 2416
adamc@31 2417 | L'.SgiCon (x, n2, k2, c2) =>
adamc@31 2418 seek (fn sgi1All as (sgi1, _) =>
adamc@211 2419 let
adamc@211 2420 fun found (x', n1, k1, c1) =
adamc@211 2421 if x = x' then
adamc@211 2422 let
adamc@211 2423 fun good () = SOME (E.pushCNamedAs env x n2 k2 (SOME c2), denv)
adamc@211 2424 in
adamc@211 2425 (case unifyCons (env, denv) c1 c2 of
adamc@211 2426 [] => good ()
adamc@211 2427 | _ => NONE)
adamc@211 2428 handle CUnify (c1, c2, err) =>
adamc@211 2429 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@211 2430 good ())
adamc@211 2431 end
adamc@211 2432 else
adamc@211 2433 NONE
adamc@211 2434 in
adamc@211 2435 case sgi1 of
adamc@211 2436 L'.SgiCon (x', n1, k1, c1) => found (x', n1, k1, c1)
adamc@211 2437 | L'.SgiClass (x', n1, c1) =>
adamc@211 2438 found (x', n1, (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc), c1)
adamc@211 2439 | _ => NONE
adamc@211 2440 end)
adamc@31 2441
adamc@191 2442 | L'.SgiDatatype (x, n2, xs2, xncs2) =>
adamc@156 2443 seek (fn sgi1All as (sgi1, _) =>
adamc@160 2444 let
adamc@191 2445 fun found (n1, xs1, xncs1) =
adamc@160 2446 let
adamc@160 2447 fun mismatched ue =
adamc@160 2448 (sgnError env (SgiMismatchedDatatypes (sgi1All, sgi2All, ue));
adamc@160 2449 SOME (env, denv))
adamc@156 2450
adamc@191 2451 val k = (L'.KType, loc)
adamc@191 2452 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs1
adamc@191 2453
adamc@160 2454 fun good () =
adamc@160 2455 let
adamc@160 2456 val env = E.sgiBinds env sgi2All
adamc@160 2457 val env = if n1 = n2 then
adamc@160 2458 env
adamc@160 2459 else
adamc@160 2460 E.pushCNamedAs env x n1 (L'.KType, loc)
adamc@160 2461 (SOME (L'.CNamed n1, loc))
adamc@160 2462 in
adamc@160 2463 SOME (env, denv)
adamc@160 2464 end
adamc@156 2465
adamc@191 2466 val env = foldl (fn (x, env) => E.pushCRel env x k) env xs1
adamc@160 2467 fun xncBad ((x1, _, t1), (x2, _, t2)) =
adamc@160 2468 String.compare (x1, x2) <> EQUAL
adamc@160 2469 orelse case (t1, t2) of
adamc@160 2470 (NONE, NONE) => false
adamc@160 2471 | (SOME t1, SOME t2) =>
adamc@160 2472 not (List.null (unifyCons (env, denv) t1 t2))
adamc@160 2473 | _ => true
adamc@160 2474 in
adamc@191 2475 (if xs1 <> xs2
adamc@191 2476 orelse length xncs1 <> length xncs2
adamc@160 2477 orelse ListPair.exists xncBad (xncs1, xncs2) then
adamc@160 2478 mismatched NONE
adamc@160 2479 else
adamc@160 2480 good ())
adamc@160 2481 handle CUnify ue => mismatched (SOME ue)
adamc@160 2482 end
adamc@160 2483 in
adamc@160 2484 case sgi1 of
adamc@191 2485 L'.SgiDatatype (x', n1, xs, xncs1) =>
adamc@160 2486 if x' = x then
adamc@191 2487 found (n1, xs, xncs1)
adamc@160 2488 else
adamc@160 2489 NONE
adamc@191 2490 | L'.SgiDatatypeImp (x', n1, _, _, _, xs, xncs1) =>
adamc@162 2491 if x' = x then
adamc@191 2492 found (n1, xs, xncs1)
adamc@162 2493 else
adamc@162 2494 NONE
adamc@160 2495 | _ => NONE
adamc@160 2496 end)
adamc@156 2497
adamc@191 2498 | L'.SgiDatatypeImp (x, n2, m12, ms2, s2, xs, _) =>
adamc@158 2499 seek (fn sgi1All as (sgi1, _) =>
adamc@158 2500 case sgi1 of
adamc@191 2501 L'.SgiDatatypeImp (x', n1, m11, ms1, s1, _, _) =>
adamc@158 2502 if x = x' then
adamc@158 2503 let
adamc@158 2504 val k = (L'.KType, loc)
adamc@191 2505 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@158 2506 val t1 = (L'.CModProj (m11, ms1, s1), loc)
adamc@158 2507 val t2 = (L'.CModProj (m12, ms2, s2), loc)
adamc@158 2508
adamc@158 2509 fun good () =
adamc@158 2510 let
adamc@191 2511 val env = E.pushCNamedAs env x n1 k' (SOME t1)
adamc@191 2512 val env = E.pushCNamedAs env x n2 k' (SOME t2)
adamc@158 2513 in
adamc@158 2514 SOME (env, denv)
adamc@158 2515 end
adamc@158 2516 in
adamc@158 2517 (case unifyCons (env, denv) t1 t2 of
adamc@158 2518 [] => good ()
adamc@158 2519 | _ => NONE)
adamc@158 2520 handle CUnify (c1, c2, err) =>
adamc@158 2521 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@158 2522 good ())
adamc@158 2523 end
adamc@158 2524 else
adamc@158 2525 NONE
adamc@158 2526
adamc@158 2527 | _ => NONE)
adamc@156 2528
adamc@32 2529 | L'.SgiVal (x, n2, c2) =>
adamc@32 2530 seek (fn sgi1All as (sgi1, _) =>
adamc@32 2531 case sgi1 of
adamc@41 2532 L'.SgiVal (x', n1, c1) =>
adamc@41 2533 if x = x' then
adamc@86 2534 (case unifyCons (env, denv) c1 c2 of
adamc@88 2535 [] => SOME (env, denv)
adamc@86 2536 | _ => NONE)
adamc@86 2537 handle CUnify (c1, c2, err) =>
adamc@86 2538 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@88 2539 SOME (env, denv))
adamc@41 2540 else
adamc@41 2541 NONE
adamc@205 2542 | L'.SgiTable (_, x', n1, c1) =>
adamc@203 2543 if x = x' then
adamc@210 2544 (case unifyCons (env, denv) (L'.CApp (tableOf (), c1), loc) c2 of
adamc@203 2545 [] => SOME (env, denv)
adamc@203 2546 | _ => NONE)
adamc@203 2547 handle CUnify (c1, c2, err) =>
adamc@203 2548 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@203 2549 SOME (env, denv))
adamc@203 2550 else
adamc@203 2551 NONE
adamc@32 2552 | _ => NONE)
adamc@32 2553
adamc@33 2554 | L'.SgiStr (x, n2, sgn2) =>
adamc@33 2555 seek (fn sgi1All as (sgi1, _) =>
adamc@33 2556 case sgi1 of
adamc@41 2557 L'.SgiStr (x', n1, sgn1) =>
adamc@41 2558 if x = x' then
adamc@66 2559 let
adamc@86 2560 val () = subSgn (env, denv) sgn1 sgn2
adamc@66 2561 val env = E.pushStrNamedAs env x n1 sgn1
adamc@66 2562 val env = if n1 = n2 then
adamc@66 2563 env
adamc@66 2564 else
adamc@66 2565 E.pushStrNamedAs env x n2
adamc@66 2566 (selfifyAt env {str = (L'.StrVar n1, #2 sgn2),
adamc@66 2567 sgn = sgn2})
adamc@66 2568 in
adamc@88 2569 SOME (env, denv)
adamc@66 2570 end
adamc@41 2571 else
adamc@41 2572 NONE
adamc@33 2573 | _ => NONE)
adamc@59 2574
adamc@59 2575 | L'.SgiSgn (x, n2, sgn2) =>
adamc@59 2576 seek (fn sgi1All as (sgi1, _) =>
adamc@59 2577 case sgi1 of
adamc@59 2578 L'.SgiSgn (x', n1, sgn1) =>
adamc@59 2579 if x = x' then
adamc@65 2580 let
adamc@86 2581 val () = subSgn (env, denv) sgn1 sgn2
adamc@86 2582 val () = subSgn (env, denv) sgn2 sgn1
adamc@65 2583
adamc@65 2584 val env = E.pushSgnNamedAs env x n2 sgn2
adamc@65 2585 val env = if n1 = n2 then
adamc@65 2586 env
adamc@65 2587 else
adamc@65 2588 E.pushSgnNamedAs env x n1 sgn2
adamc@65 2589 in
adamc@88 2590 SOME (env, denv)
adamc@65 2591 end
adamc@59 2592 else
adamc@59 2593 NONE
adamc@59 2594 | _ => NONE)
adamc@88 2595
adamc@88 2596 | L'.SgiConstraint (c2, d2) =>
adamc@88 2597 seek (fn sgi1All as (sgi1, _) =>
adamc@88 2598 case sgi1 of
adamc@88 2599 L'.SgiConstraint (c1, d1) =>
adamc@88 2600 if consEq (env, denv) (c1, c2) andalso consEq (env, denv) (d1, d2) then
adamc@90 2601 let
adamc@90 2602 val (denv, gs) = D.assert env denv (c2, d2)
adamc@90 2603 in
adamc@90 2604 case gs of
adamc@90 2605 [] => ()
adamc@90 2606 | _ => raise Fail "subSgn: Sub-constraints remain";
adamc@90 2607
adamc@90 2608 SOME (env, denv)
adamc@90 2609 end
adamc@88 2610 else
adamc@88 2611 NONE
adamc@88 2612 | _ => NONE)
adamc@203 2613
adamc@205 2614 | L'.SgiTable (_, x, n2, c2) =>
adamc@203 2615 seek (fn sgi1All as (sgi1, _) =>
adamc@203 2616 case sgi1 of
adamc@205 2617 L'.SgiTable (_, x', n1, c1) =>
adamc@203 2618 if x = x' then
adamc@203 2619 (case unifyCons (env, denv) c1 c2 of
adamc@203 2620 [] => SOME (env, denv)
adamc@203 2621 | _ => NONE)
adamc@203 2622 handle CUnify (c1, c2, err) =>
adamc@203 2623 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@203 2624 SOME (env, denv))
adamc@203 2625 else
adamc@203 2626 NONE
adamc@203 2627 | _ => NONE)
adamc@211 2628
adamc@211 2629 | L'.SgiClassAbs (x, n2) =>
adamc@211 2630 seek (fn sgi1All as (sgi1, _) =>
adamc@211 2631 let
adamc@211 2632 fun found (x', n1, co) =
adamc@211 2633 if x = x' then
adamc@211 2634 let
adamc@211 2635 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2636 val env = E.pushCNamedAs env x n1 k co
adamc@211 2637 in
adamc@211 2638 SOME (if n1 = n2 then
adamc@211 2639 env
adamc@211 2640 else
adamc@211 2641 E.pushCNamedAs env x n2 k (SOME (L'.CNamed n1, loc2)),
adamc@211 2642 denv)
adamc@211 2643 end
adamc@211 2644 else
adamc@211 2645 NONE
adamc@211 2646 in
adamc@211 2647 case sgi1 of
adamc@211 2648 L'.SgiClassAbs (x', n1) => found (x', n1, NONE)
adamc@211 2649 | L'.SgiClass (x', n1, c) => found (x', n1, SOME c)
adamc@211 2650 | _ => NONE
adamc@211 2651 end)
adamc@211 2652 | L'.SgiClass (x, n2, c2) =>
adamc@211 2653 seek (fn sgi1All as (sgi1, _) =>
adamc@211 2654 let
adamc@211 2655 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2656
adamc@211 2657 fun found (x', n1, c1) =
adamc@211 2658 if x = x' then
adamc@211 2659 let
adamc@218 2660 fun good () =
adamc@218 2661 let
adamc@218 2662 val env = E.pushCNamedAs env x n2 k (SOME c2)
adamc@218 2663 val env = if n1 = n2 then
adamc@218 2664 env
adamc@218 2665 else
adamc@218 2666 E.pushCNamedAs env x n1 k (SOME c1)
adamc@218 2667 in
adamc@218 2668 SOME (env, denv)
adamc@218 2669 end
adamc@211 2670 in
adamc@211 2671 (case unifyCons (env, denv) c1 c2 of
adamc@211 2672 [] => good ()
adamc@211 2673 | _ => NONE)
adamc@211 2674 handle CUnify (c1, c2, err) =>
adamc@211 2675 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@211 2676 good ())
adamc@211 2677 end
adamc@211 2678 else
adamc@211 2679 NONE
adamc@211 2680 in
adamc@211 2681 case sgi1 of
adamc@211 2682 L'.SgiClass (x', n1, c1) => found (x', n1, c1)
adamc@211 2683 | _ => NONE
adamc@211 2684 end)
adamc@31 2685 end
adamc@31 2686 in
adamc@88 2687 ignore (foldl folder (env, denv) sgis2)
adamc@31 2688 end
adamc@31 2689
adamc@41 2690 | (L'.SgnFun (m1, n1, dom1, ran1), L'.SgnFun (m2, n2, dom2, ran2)) =>
adamc@43 2691 let
adamc@43 2692 val ran1 =
adamc@43 2693 if n1 = n2 then
adamc@43 2694 ran1
adamc@43 2695 else
adamc@43 2696 subStrInSgn (n1, n2) ran1
adamc@43 2697 in
adamc@86 2698 subSgn (env, denv) dom2 dom1;
adamc@86 2699 subSgn (E.pushStrNamedAs env m2 n2 dom2, denv) ran1 ran2
adamc@43 2700 end
adamc@41 2701
adamc@41 2702 | _ => sgnError env (SgnWrongForm (sgn1, sgn2))
adamc@41 2703
adamc@61 2704
adamc@228 2705 fun elabDecl ((d, loc), (env, denv, gs : constraint list)) =
adamc@76 2706 case d of
adamc@76 2707 L.DCon (x, ko, c) =>
adamc@76 2708 let
adamc@76 2709 val k' = case ko of
adamc@76 2710 NONE => kunif loc
adamc@76 2711 | SOME k => elabKind k
adamc@76 2712
adamc@83 2713 val (c', ck, gs') = elabCon (env, denv) c
adamc@76 2714 val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@76 2715 in
adamc@76 2716 checkKind env c' ck k';
adamc@76 2717
adamc@228 2718 ([(L'.DCon (x, n, k', c'), loc)], (env', denv, enD gs' @ gs))
adamc@76 2719 end
adamc@191 2720 | L.DDatatype (x, xs, xcs) =>
adamc@156 2721 let
adamc@156 2722 val k = (L'.KType, loc)
adamc@191 2723 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 2724 val (env, n) = E.pushCNamed env x k' NONE
adamc@156 2725 val t = (L'.CNamed n, loc)
adamc@194 2726 val nxs = length xs - 1
adamc@194 2727 val t = ListUtil.foldli (fn (i, _, t) => (L'.CApp (t, (L'.CRel (nxs - i), loc)), loc)) t xs
adamc@191 2728
adamc@191 2729 val (env', denv') = foldl (fn (x, (env', denv')) =>
adamc@191 2730 (E.pushCRel env' x k,
adamc@191 2731 D.enter denv')) (env, denv) xs
adamc@156 2732
adamc@156 2733 val (xcs, (used, env, gs)) =
adamc@156 2734 ListUtil.foldlMap
adamc@156 2735 (fn ((x, to), (used, env, gs)) =>
adamc@156 2736 let
adamc@156 2737 val (to, t, gs') = case to of
adamc@156 2738 NONE => (NONE, t, gs)
adamc@156 2739 | SOME t' =>
adamc@156 2740 let
adamc@191 2741 val (t', tk, gs') = elabCon (env', denv') t'
adamc@156 2742 in
adamc@191 2743 checkKind env' t' tk k;
adamc@228 2744 (SOME t', (L'.TFun (t', t), loc), enD gs' @ gs)
adamc@156 2745 end
adamc@191 2746 val t = foldr (fn (x, t) => (L'.TCFun (L'.Implicit, x, k, t), loc)) t xs
adamc@156 2747
adamc@156 2748 val (env, n') = E.pushENamed env x t
adamc@156 2749 in
adamc@156 2750 if SS.member (used, x) then
adamc@156 2751 strError env (DuplicateConstructor (x, loc))
adamc@156 2752 else
adamc@156 2753 ();
adamc@156 2754 ((x, n', to), (SS.add (used, x), env, gs'))
adamc@156 2755 end)
adamc@156 2756 (SS.empty, env, []) xcs
adamc@171 2757
adamc@191 2758 val env = E.pushDatatype env n xs xcs
adamc@156 2759 in
adamc@191 2760 ([(L'.DDatatype (x, n, xs, xcs), loc)], (env, denv, gs))
adamc@156 2761 end
adamc@156 2762
adamc@157 2763 | L.DDatatypeImp (_, [], _) => raise Fail "Empty DDatatypeImp"
adamc@157 2764
adamc@157 2765 | L.DDatatypeImp (x, m1 :: ms, s) =>
adamc@157 2766 (case E.lookupStr env m1 of
adamc@157 2767 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@157 2768 ([], (env, denv, gs)))
adamc@157 2769 | SOME (n, sgn) =>
adamc@157 2770 let
adamc@157 2771 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@157 2772 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@157 2773 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@157 2774 (strerror, sgnerror))
adamc@157 2775 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@157 2776 ((L'.StrVar n, loc), sgn) ms
adamc@157 2777 in
adamc@158 2778 case hnormCon (env, denv) (L'.CModProj (n, ms, s), loc) of
adamc@228 2779 ((L'.CModProj (n, ms, s), _), gs') =>
adamc@158 2780 (case E.projectDatatype env {sgn = sgn, str = str, field = s} of
adamc@158 2781 NONE => (conError env (UnboundDatatype (loc, s));
adamc@158 2782 ([], (env, denv, gs)))
adamc@191 2783 | SOME (xs, xncs) =>
adamc@158 2784 let
adamc@158 2785 val k = (L'.KType, loc)
adamc@191 2786 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@158 2787 val t = (L'.CModProj (n, ms, s), loc)
adamc@191 2788 val (env, n') = E.pushCNamed env x k' (SOME t)
adamc@191 2789 val env = E.pushDatatype env n' xs xncs
adamc@157 2790
adamc@158 2791 val t = (L'.CNamed n', loc)
adamc@158 2792 val env = foldl (fn ((x, n, to), env) =>
adamc@158 2793 let
adamc@158 2794 val t = case to of
adamc@158 2795 NONE => t
adamc@158 2796 | SOME t' => (L'.TFun (t', t), loc)
adamc@191 2797
adamc@191 2798 val t = foldr (fn (x, t) =>
adamc@191 2799 (L'.TCFun (L'.Implicit, x, k, t), loc))
adamc@191 2800 t xs
adamc@158 2801 in
adamc@158 2802 E.pushENamedAs env x n t
adamc@158 2803 end) env xncs
adamc@158 2804 in
adamc@228 2805 ([(L'.DDatatypeImp (x, n', n, ms, s, xs, xncs), loc)], (env, denv, enD gs' @ gs))
adamc@158 2806 end)
adamc@158 2807 | _ => (strError env (NotDatatype loc);
adamc@158 2808 ([], (env, denv, [])))
adamc@157 2809 end)
adamc@157 2810
adamc@76 2811 | L.DVal (x, co, e) =>
adamc@76 2812 let
adamc@123 2813 val (c', _, gs1) = case co of
adamc@83 2814 NONE => (cunif (loc, ktype), ktype, [])
adamc@83 2815 | SOME c => elabCon (env, denv) c
adamc@76 2816
adamc@83 2817 val (e', et, gs2) = elabExp (env, denv) e
adamc@217 2818 val gs3 = checkCon (env, denv) e' et c'
adamc@217 2819 val (c', gs4) = normClassConstraint (env, denv) c'
adamc@76 2820 val (env', n) = E.pushENamed env x c'
adamc@76 2821 in
adamc@217 2822 (*prefaces "DVal" [("x", Print.PD.string x),
adamc@217 2823 ("c'", p_con env c')];*)
adamc@228 2824 ([(L'.DVal (x, n, c', e'), loc)], (env', denv, enD gs1 @ gs2 @ enD gs3 @ enD gs4 @ gs))
adamc@76 2825 end
adamc@123 2826 | L.DValRec vis =>
adamc@123 2827 let
adamc@123 2828 val (vis, gs) = ListUtil.foldlMap
adamc@123 2829 (fn ((x, co, e), gs) =>
adamc@123 2830 let
adamc@123 2831 val (c', _, gs1) = case co of
adamc@123 2832 NONE => (cunif (loc, ktype), ktype, [])
adamc@123 2833 | SOME c => elabCon (env, denv) c
adamc@123 2834 in
adamc@228 2835 ((x, c', e), enD gs1 @ gs)
adamc@123 2836 end) [] vis
adamc@123 2837
adamc@123 2838 val (vis, env) = ListUtil.foldlMap (fn ((x, c', e), env) =>
adamc@123 2839 let
adamc@123 2840 val (env, n) = E.pushENamed env x c'
adamc@123 2841 in
adamc@123 2842 ((x, n, c', e), env)
adamc@123 2843 end) env vis
adamc@123 2844
adamc@123 2845 val (vis, gs) = ListUtil.foldlMap (fn ((x, n, c', e), gs) =>
adamc@123 2846 let
adamc@123 2847 val (e', et, gs1) = elabExp (env, denv) e
adamc@123 2848
adamc@123 2849 val gs2 = checkCon (env, denv) e' et c'
adamc@123 2850 in
adamc@228 2851 ((x, n, c', e'), gs1 @ enD gs2 @ gs)
adamc@123 2852 end) gs vis
adamc@123 2853 in
adamc@123 2854 ([(L'.DValRec vis, loc)], (env, denv, gs))
adamc@123 2855 end
adamc@76 2856
adamc@76 2857 | L.DSgn (x, sgn) =>
adamc@76 2858 let
adamc@83 2859 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2860 val (env', n) = E.pushSgnNamed env x sgn'
adamc@76 2861 in
adamc@228 2862 ([(L'.DSgn (x, n, sgn'), loc)], (env', denv, enD gs' @ gs))
adamc@76 2863 end
adamc@76 2864
adamc@76 2865 | L.DStr (x, sgno, str) =>
adamc@76 2866 let
adamc@93 2867 val () = if x = "Basis" then
adamc@93 2868 raise Fail "Not allowed to redefine structure 'Basis'"
adamc@93 2869 else
adamc@93 2870 ()
adamc@93 2871
adamc@83 2872 val formal = Option.map (elabSgn (env, denv)) sgno
adamc@76 2873
adamc@83 2874 val (str', sgn', gs') =
adamc@78 2875 case formal of
adamc@78 2876 NONE =>
adamc@78 2877 let
adamc@83 2878 val (str', actual, ds) = elabStr (env, denv) str
adamc@78 2879 in
adamc@83 2880 (str', selfifyAt env {str = str', sgn = actual}, ds)
adamc@78 2881 end
adamc@83 2882 | SOME (formal, gs1) =>
adamc@78 2883 let
adamc@78 2884 val str =
adamc@78 2885 case #1 (hnormSgn env formal) of
adamc@78 2886 L'.SgnConst sgis =>
adamc@78 2887 (case #1 str of
adamc@78 2888 L.StrConst ds =>
adamc@78 2889 let
adamc@78 2890 val needed = foldl (fn ((sgi, _), needed) =>
adamc@78 2891 case sgi of
adamc@78 2892 L'.SgiConAbs (x, _, _) => SS.add (needed, x)
adamc@78 2893 | _ => needed)
adamc@78 2894 SS.empty sgis
adamc@78 2895
adamc@78 2896 val needed = foldl (fn ((d, _), needed) =>
adamc@78 2897 case d of
adamc@78 2898 L.DCon (x, _, _) => (SS.delete (needed, x)
adamc@78 2899 handle NotFound => needed)
adamc@218 2900 | L.DClass (x, _) => (SS.delete (needed, x)
adamc@218 2901 handle NotFound => needed)
adamc@78 2902 | L.DOpen _ => SS.empty
adamc@78 2903 | _ => needed)
adamc@78 2904 needed ds
adamc@78 2905 in
adamc@78 2906 case SS.listItems needed of
adamc@78 2907 [] => str
adamc@78 2908 | xs =>
adamc@78 2909 let
adamc@78 2910 val kwild = (L.KWild, #2 str)
adamc@78 2911 val cwild = (L.CWild kwild, #2 str)
adamc@78 2912 val ds' = map (fn x => (L.DCon (x, NONE, cwild), #2 str)) xs
adamc@78 2913 in
adamc@78 2914 (L.StrConst (ds @ ds'), #2 str)
adamc@78 2915 end
adamc@78 2916 end
adamc@78 2917 | _ => str)
adamc@78 2918 | _ => str
adamc@78 2919
adamc@83 2920 val (str', actual, gs2) = elabStr (env, denv) str
adamc@78 2921 in
adamc@158 2922 subSgn (env, denv) (selfifyAt env {str = str', sgn = actual}) formal;
adamc@228 2923 (str', formal, enD gs1 @ gs2)
adamc@78 2924 end
adamc@76 2925
adamc@76 2926 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 2927 in
adamc@76 2928 case #1 (hnormSgn env sgn') of
adamc@76 2929 L'.SgnFun _ =>
adamc@76 2930 (case #1 str' of
adamc@76 2931 L'.StrFun _ => ()
adamc@76 2932 | _ => strError env (FunctorRebind loc))
adamc@76 2933 | _ => ();
adamc@76 2934
adamc@88 2935 ([(L'.DStr (x, n, sgn', str'), loc)], (env', denv, gs' @ gs))
adamc@76 2936 end
adamc@76 2937
adamc@76 2938 | L.DFfiStr (x, sgn) =>
adamc@76 2939 let
adamc@83 2940 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2941
adamc@76 2942 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 2943 in
adamc@228 2944 ([(L'.DFfiStr (x, n, sgn'), loc)], (env', denv, enD gs' @ gs))
adamc@76 2945 end
adamc@76 2946
adamc@76 2947 | L.DOpen (m, ms) =>
adamc@88 2948 (case E.lookupStr env m of
adamc@88 2949 NONE => (strError env (UnboundStr (loc, m));
adamc@205 2950 ([], (env, denv, gs)))
adamc@88 2951 | SOME (n, sgn) =>
adamc@88 2952 let
adamc@88 2953 val (_, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@88 2954 case E.projectStr env {str = str, sgn = sgn, field = m} of
adamc@88 2955 NONE => (strError env (UnboundStr (loc, m));
adamc@88 2956 (strerror, sgnerror))
adamc@88 2957 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@88 2958 ((L'.StrVar n, loc), sgn) ms
adamc@83 2959
adamc@88 2960 val (ds, (env', denv')) = dopen (env, denv) {str = n, strs = ms, sgn = sgn}
adamc@88 2961 val denv' = dopenConstraints (loc, env', denv') {str = m, strs = ms}
adamc@88 2962 in
adamc@205 2963 (ds, (env', denv', gs))
adamc@88 2964 end)
adamc@88 2965
adamc@88 2966 | L.DConstraint (c1, c2) =>
adamc@88 2967 let
adamc@88 2968 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@88 2969 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@90 2970 val gs3 = D.prove env denv (c1', c2', loc)
adamc@88 2971
adamc@90 2972 val (denv', gs4) = D.assert env denv (c1', c2')
adamc@88 2973 in
adamc@88 2974 checkKind env c1' k1 (L'.KRecord (kunif loc), loc);
adamc@88 2975 checkKind env c2' k2 (L'.KRecord (kunif loc), loc);
adamc@88 2976
adamc@228 2977 ([(L'.DConstraint (c1', c2'), loc)], (env, denv', enD gs1 @ enD gs2 @ enD gs3 @ enD gs4 @ gs))
adamc@88 2978 end
adamc@88 2979
adamc@88 2980 | L.DOpenConstraints (m, ms) =>
adamc@88 2981 let
adamc@88 2982 val denv = dopenConstraints (loc, env, denv) {str = m, strs = ms}
adamc@88 2983 in
adamc@205 2984 ([], (env, denv, gs))
adamc@88 2985 end
adamc@3 2986
adamc@109 2987 | L.DExport str =>
adamc@100 2988 let
adamc@205 2989 val (str', sgn, gs') = elabStr (env, denv) str
adamc@100 2990
adamc@109 2991 val sgn =
adamc@109 2992 case #1 (hnormSgn env sgn) of
adamc@109 2993 L'.SgnConst sgis =>
adamc@109 2994 let
adamc@146 2995 fun doOne (all as (sgi, _), env) =
adamc@146 2996 (case sgi of
adamc@146 2997 L'.SgiVal (x, n, t) =>
adamc@146 2998 (case hnormCon (env, denv) t of
adamc@146 2999 ((L'.TFun (dom, ran), _), []) =>
adamc@146 3000 (case (hnormCon (env, denv) dom, hnormCon (env, denv) ran) of
adamc@146 3001 (((L'.TRecord domR, _), []),
adamc@146 3002 ((L'.CApp (tf, arg3), _), [])) =>
adamc@146 3003 (case (hnormCon (env, denv) tf, hnormCon (env, denv) arg3) of
adamc@146 3004 (((L'.CApp (tf, arg2), _), []),
adamc@146 3005 (((L'.CRecord (_, []), _), []))) =>
adamc@146 3006 (case (hnormCon (env, denv) tf) of
adamc@146 3007 ((L'.CApp (tf, arg1), _), []) =>
adamc@146 3008 (case (hnormCon (env, denv) tf,
adamc@146 3009 hnormCon (env, denv) domR,
adamc@152 3010 hnormCon (env, denv) arg1,
adamc@146 3011 hnormCon (env, denv) arg2) of
adamc@152 3012 ((tf, []), (domR, []), (arg1, []),
adamc@146 3013 ((L'.CRecord (_, []), _), [])) =>
adamc@146 3014 let
adamc@146 3015 val t = (L'.CApp (tf, arg1), loc)
adamc@146 3016 val t = (L'.CApp (t, arg2), loc)
adamc@146 3017 val t = (L'.CApp (t, arg3), loc)
adamc@146 3018 in
adamc@146 3019 (L'.SgiVal (x, n, (L'.TFun ((L'.TRecord domR, loc),
adamc@146 3020 t),
adamc@146 3021 loc)), loc)
adamc@146 3022 end
adamc@146 3023 | _ => all)
adamc@146 3024 | _ => all)
adamc@146 3025 | _ => all)
adamc@146 3026 | _ => all)
adamc@146 3027 | _ => all)
adamc@146 3028 | _ => all,
adamc@146 3029 E.sgiBinds env all)
adamc@109 3030 in
adamc@146 3031 (L'.SgnConst (#1 (ListUtil.foldlMap doOne env sgis)), loc)
adamc@109 3032 end
adamc@109 3033 | _ => sgn
adamc@100 3034 in
adamc@205 3035 ([(L'.DExport (E.newNamed (), sgn, str'), loc)], (env, denv, gs' @ gs))
adamc@100 3036 end
adamc@100 3037
adamc@203 3038 | L.DTable (x, c) =>
adamc@203 3039 let
adamc@205 3040 val (c', k, gs') = elabCon (env, denv) c
adamc@210 3041 val (env, n) = E.pushENamed env x (L'.CApp (tableOf (), c'), loc)
adamc@203 3042 in
adamc@203 3043 checkKind env c' k (L'.KRecord (L'.KType, loc), loc);
adamc@228 3044 ([(L'.DTable (!basis_r, x, n, c'), loc)], (env, denv, enD gs' @ gs))
adamc@203 3045 end
adamc@203 3046
adamc@211 3047 | L.DClass (x, c) =>
adamc@211 3048 let
adamc@211 3049 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 3050 val (c', ck, gs) = elabCon (env, denv) c
adamc@211 3051 val (env, n) = E.pushCNamed env x k (SOME c')
adamc@211 3052 val env = E.pushClass env n
adamc@211 3053 in
adamc@211 3054 checkKind env c' ck k;
adamc@213 3055 ([(L'.DClass (x, n, c'), loc)], (env, denv, []))
adamc@211 3056 end
adamc@211 3057
adamc@83 3058 and elabStr (env, denv) (str, loc) =
adamc@31 3059 case str of
adamc@31 3060 L.StrConst ds =>
adamc@31 3061 let
adamc@88 3062 val (ds', (_, _, gs)) = ListUtil.foldlMapConcat elabDecl (env, denv, []) ds
adamc@123 3063 val sgis = ListUtil.mapConcat sgiOfDecl ds'
adamc@63 3064
adamc@63 3065 val (sgis, _, _, _, _) =
adamc@64 3066 foldr (fn ((sgi, loc), (sgis, cons, vals, sgns, strs)) =>
adamc@63 3067 case sgi of
adamc@64 3068 L'.SgiConAbs (x, n, k) =>
adamc@64 3069 let
adamc@64 3070 val (cons, x) =
adamc@64 3071 if SS.member (cons, x) then
adamc@64 3072 (cons, "?" ^ x)
adamc@64 3073 else
adamc@64 3074 (SS.add (cons, x), x)
adamc@64 3075 in
adamc@64 3076 ((L'.SgiConAbs (x, n, k), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 3077 end
adamc@64 3078 | L'.SgiCon (x, n, k, c) =>
adamc@64 3079 let
adamc@64 3080 val (cons, x) =
adamc@64 3081 if SS.member (cons, x) then
adamc@64 3082 (cons, "?" ^ x)
adamc@64 3083 else
adamc@64 3084 (SS.add (cons, x), x)
adamc@64 3085 in
adamc@64 3086 ((L'.SgiCon (x, n, k, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 3087 end
adamc@191 3088 | L'.SgiDatatype (x, n, xs, xncs) =>
adamc@156 3089 let
adamc@156 3090 val (cons, x) =
adamc@156 3091 if SS.member (cons, x) then
adamc@156 3092 (cons, "?" ^ x)
adamc@156 3093 else
adamc@156 3094 (SS.add (cons, x), x)
adamc@156 3095
adamc@156 3096 val (xncs, vals) =
adamc@156 3097 ListUtil.foldlMap
adamc@156 3098 (fn ((x, n, t), vals) =>
adamc@156 3099 if SS.member (vals, x) then
adamc@156 3100 (("?" ^ x, n, t), vals)
adamc@156 3101 else
adamc@156 3102 ((x, n, t), SS.add (vals, x)))
adamc@156 3103 vals xncs
adamc@156 3104 in
adamc@191 3105 ((L'.SgiDatatype (x, n, xs, xncs), loc) :: sgis, cons, vals, sgns, strs)
adamc@156 3106 end
adamc@191 3107 | L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs) =>
adamc@156 3108 let
adamc@156 3109 val (cons, x) =
adamc@156 3110 if SS.member (cons, x) then
adamc@156 3111 (cons, "?" ^ x)
adamc@156 3112 else
adamc@156 3113 (SS.add (cons, x), x)
adamc@156 3114 in
adamc@191 3115 ((L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs), loc) :: sgis, cons, vals, sgns, strs)
adamc@156 3116 end
adamc@64 3117 | L'.SgiVal (x, n, c) =>
adamc@64 3118 let
adamc@64 3119 val (vals, x) =
adamc@64 3120 if SS.member (vals, x) then
adamc@64 3121 (vals, "?" ^ x)
adamc@64 3122 else
adamc@64 3123 (SS.add (vals, x), x)
adamc@64 3124 in
adamc@64 3125 ((L'.SgiVal (x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 3126 end
adamc@64 3127 | L'.SgiSgn (x, n, sgn) =>
adamc@64 3128 let
adamc@64 3129 val (sgns, x) =
adamc@64 3130 if SS.member (sgns, x) then
adamc@64 3131 (sgns, "?" ^ x)
adamc@64 3132 else
adamc@64 3133 (SS.add (sgns, x), x)
adamc@64 3134 in
adamc@64 3135 ((L'.SgiSgn (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 3136 end
adamc@64 3137
adamc@64 3138 | L'.SgiStr (x, n, sgn) =>
adamc@64 3139 let
adamc@64 3140 val (strs, x) =
adamc@64 3141 if SS.member (strs, x) then
adamc@64 3142 (strs, "?" ^ x)
adamc@64 3143 else
adamc@64 3144 (SS.add (strs, x), x)
adamc@64 3145 in
adamc@64 3146 ((L'.SgiStr (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@88 3147 end
adamc@203 3148 | L'.SgiConstraint _ => ((sgi, loc) :: sgis, cons, vals, sgns, strs)
adamc@205 3149 | L'.SgiTable (tn, x, n, c) =>
adamc@203 3150 let
adamc@203 3151 val (vals, x) =
adamc@203 3152 if SS.member (vals, x) then
adamc@203 3153 (vals, "?" ^ x)
adamc@203 3154 else
adamc@203 3155 (SS.add (vals, x), x)
adamc@203 3156 in
adamc@205 3157 ((L'.SgiTable (tn, x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@211 3158 end
adamc@211 3159 | L'.SgiClassAbs (x, n) =>
adamc@211 3160 let
adamc@211 3161 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 3162
adamc@211 3163 val (cons, x) =
adamc@211 3164 if SS.member (cons, x) then
adamc@211 3165 (cons, "?" ^ x)
adamc@211 3166 else
adamc@211 3167 (SS.add (cons, x), x)
adamc@211 3168 in
adamc@211 3169 ((L'.SgiClassAbs (x, n), loc) :: sgis, cons, vals, sgns, strs)
adamc@211 3170 end
adamc@211 3171 | L'.SgiClass (x, n, c) =>
adamc@211 3172 let
adamc@211 3173 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 3174
adamc@211 3175 val (cons, x) =
adamc@211 3176 if SS.member (cons, x) then
adamc@211 3177 (cons, "?" ^ x)
adamc@211 3178 else
adamc@211 3179 (SS.add (cons, x), x)
adamc@211 3180 in
adamc@211 3181 ((L'.SgiClass (x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@203 3182 end)
adamc@64 3183
adamc@63 3184 ([], SS.empty, SS.empty, SS.empty, SS.empty) sgis
adamc@31 3185 in
adamc@83 3186 ((L'.StrConst ds', loc), (L'.SgnConst sgis, loc), gs)
adamc@31 3187 end
adamc@31 3188 | L.StrVar x =>
adamc@31 3189 (case E.lookupStr env x of
adamc@31 3190 NONE =>
adamc@31 3191 (strError env (UnboundStr (loc, x));
adamc@83 3192 (strerror, sgnerror, []))
adamc@83 3193 | SOME (n, sgn) => ((L'.StrVar n, loc), sgn, []))
adamc@34 3194 | L.StrProj (str, x) =>
adamc@34 3195 let
adamc@83 3196 val (str', sgn, gs) = elabStr (env, denv) str
adamc@34 3197 in
adamc@34 3198 case E.projectStr env {str = str', sgn = sgn, field = x} of
adamc@34 3199 NONE => (strError env (UnboundStr (loc, x));
adamc@83 3200 (strerror, sgnerror, []))
adamc@83 3201 | SOME sgn => ((L'.StrProj (str', x), loc), sgn, gs)
adamc@34 3202 end
adamc@41 3203 | L.StrFun (m, dom, ranO, str) =>
adamc@41 3204 let
adamc@83 3205 val (dom', gs1) = elabSgn (env, denv) dom
adamc@41 3206 val (env', n) = E.pushStrNamed env m dom'
adamc@83 3207 val (str', actual, gs2) = elabStr (env', denv) str
adamc@41 3208
adamc@83 3209 val (formal, gs3) =
adamc@41 3210 case ranO of
adamc@83 3211 NONE => (actual, [])
adamc@41 3212 | SOME ran =>
adamc@41 3213 let
adamc@83 3214 val (ran', gs) = elabSgn (env', denv) ran
adamc@41 3215 in
adamc@86 3216 subSgn (env', denv) actual ran';
adamc@83 3217 (ran', gs)
adamc@41 3218 end
adamc@41 3219 in
adamc@41 3220 ((L'.StrFun (m, n, dom', formal, str'), loc),
adamc@83 3221 (L'.SgnFun (m, n, dom', formal), loc),
adamc@228 3222 enD gs1 @ gs2 @ enD gs3)
adamc@41 3223 end
adamc@44 3224 | L.StrApp (str1, str2) =>
adamc@44 3225 let
adamc@83 3226 val (str1', sgn1, gs1) = elabStr (env, denv) str1
adamc@83 3227 val (str2', sgn2, gs2) = elabStr (env, denv) str2
adamc@44 3228 in
adamc@44 3229 case #1 (hnormSgn env sgn1) of
adamc@83 3230 L'.SgnError => (strerror, sgnerror, [])
adamc@44 3231 | L'.SgnFun (m, n, dom, ran) =>
adamc@86 3232 (subSgn (env, denv) sgn2 dom;
adamc@44 3233 case #1 (hnormSgn env ran) of
adamc@83 3234 L'.SgnError => (strerror, sgnerror, [])
adamc@44 3235 | L'.SgnConst sgis =>
adamc@44 3236 ((L'.StrApp (str1', str2'), loc),
adamc@83 3237 (L'.SgnConst ((L'.SgiStr (m, n, selfifyAt env {str = str2', sgn = sgn2}), loc) :: sgis), loc),
adamc@83 3238 gs1 @ gs2)
adamc@44 3239 | _ => raise Fail "Unable to hnormSgn in functor application")
adamc@44 3240 | _ => (strError env (NotFunctor sgn1);
adamc@83 3241 (strerror, sgnerror, []))
adamc@44 3242 end
adamc@31 3243
adamc@56 3244 fun elabFile basis env file =
adamc@56 3245 let
adamc@83 3246 val (sgn, gs) = elabSgn (env, D.empty) (L.SgnConst basis, ErrorMsg.dummySpan)
adamc@83 3247 val () = case gs of
adamc@83 3248 [] => ()
adamc@207 3249 | _ => (app (fn (_, env, _, c1, c2) =>
adamc@207 3250 prefaces "Unresolved"
adamc@207 3251 [("c1", p_con env c1),
adamc@207 3252 ("c2", p_con env c2)]) gs;
adamc@207 3253 raise Fail "Unresolved disjointness constraints in Basis")
adamc@83 3254
adamc@56 3255 val (env', basis_n) = E.pushStrNamed env "Basis" sgn
adamc@210 3256 val () = basis_r := basis_n
adamc@56 3257
adamc@88 3258 val (ds, (env', _)) = dopen (env', D.empty) {str = basis_n, strs = [], sgn = sgn}
adamc@56 3259
adamc@56 3260 fun discoverC r x =
adamc@56 3261 case E.lookupC env' x of
adamc@56 3262 E.NotBound => raise Fail ("Constructor " ^ x ^ " unbound in Basis")
adamc@56 3263 | E.Rel _ => raise Fail ("Constructor " ^ x ^ " bound relatively in Basis")
adamc@56 3264 | E.Named (n, (_, loc)) => r := (L'.CNamed n, loc)
adamc@56 3265
adamc@56 3266 val () = discoverC int "int"
adamc@56 3267 val () = discoverC float "float"
adamc@56 3268 val () = discoverC string "string"
adamc@203 3269 val () = discoverC table "sql_table"
adamc@56 3270
adamc@83 3271 fun elabDecl' (d, (env, gs)) =
adamc@76 3272 let
adamc@76 3273 val () = resetKunif ()
adamc@76 3274 val () = resetCunif ()
adamc@88 3275 val (ds, (env, _, gs)) = elabDecl (d, (env, D.empty, gs))
adamc@76 3276 in
adamc@76 3277 if ErrorMsg.anyErrors () then
adamc@76 3278 ()
adamc@76 3279 else (
adamc@76 3280 if List.exists kunifsInDecl ds then
adamc@91 3281 declError env (KunifsRemain ds)
adamc@76 3282 else
adamc@76 3283 ();
adamc@76 3284
adamc@76 3285 case ListUtil.search cunifsInDecl ds of
adamc@76 3286 NONE => ()
adamc@76 3287 | SOME loc =>
adamc@91 3288 declError env (CunifsRemain ds)
adamc@76 3289 );
adamc@76 3290
adamc@83 3291 (ds, (env, gs))
adamc@76 3292 end
adamc@76 3293
adamc@83 3294 val (file, (_, gs)) = ListUtil.foldlMapConcat elabDecl' (env', []) file
adamc@56 3295 in
adamc@84 3296 if ErrorMsg.anyErrors () then
adamc@84 3297 ()
adamc@84 3298 else
adamc@228 3299 app (fn Disjoint (loc, env, denv, c1, c2) =>
adamc@228 3300 (case D.prove env denv (c1, c2, loc) of
adamc@228 3301 [] => ()
adamc@228 3302 | _ =>
adamc@228 3303 (ErrorMsg.errorAt loc "Couldn't prove field name disjointness";
adamc@228 3304 eprefaces' [("Con 1", p_con env c1),
adamc@228 3305 ("Con 2", p_con env c2),
adamc@228 3306 ("Hnormed 1", p_con env (ElabOps.hnormCon env c1)),
adamc@228 3307 ("Hnormed 2", p_con env (ElabOps.hnormCon env c2))]))
adamc@228 3308 | TypeClass (env, c, r, loc) =>
adamc@228 3309 case E.resolveClass env c of
adamc@228 3310 SOME e => r := SOME e
adamc@228 3311 | NONE => expError env (Unresolvable (loc, c))) gs;
adamc@83 3312
adamc@56 3313 (L'.DFfiStr ("Basis", basis_n, sgn), ErrorMsg.dummySpan) :: ds @ file
adamc@56 3314 end
adamc@2 3315
adamc@2 3316 end