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annotate src/elaborate.sml @ 218:a3413288cce1

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Signature ascription for type classes
author Adam Chlipala <adamc@hcoop.net>
date Sat, 16 Aug 2008 16:57:21 -0400
parents 56db662ebcfd
children 2b665e822e9a
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@86 643 fun unifyRecordCons (env, denv) (c1, c2) =
adamc@12 644 let
adamc@92 645 fun rkindof c =
adamc@147 646 case hnormKind (kindof env c) of
adamc@92 647 (L'.KRecord k, _) => k
adamc@141 648 | (L'.KError, _) => kerror
adamc@141 649 | k => raise CUnify' (CKindof (k, c))
adamc@92 650
adamc@92 651 val k1 = rkindof c1
adamc@92 652 val k2 = rkindof c2
adamc@86 653
adamc@86 654 val (r1, gs1) = recordSummary (env, denv) c1
adamc@86 655 val (r2, gs2) = recordSummary (env, denv) c2
adamc@12 656 in
adamc@12 657 unifyKinds k1 k2;
adamc@86 658 unifySummaries (env, denv) (k1, r1, r2);
adamc@86 659 gs1 @ gs2
adamc@12 660 end
adamc@12 661
adamc@86 662 and recordSummary (env, denv) c =
adamc@86 663 let
adamc@86 664 val (c, gs) = hnormCon (env, denv) c
adamc@12 665
adamc@86 666 val (sum, gs') =
adamc@86 667 case c of
adamc@86 668 (L'.CRecord (_, xcs), _) => ({fields = xcs, unifs = [], others = []}, [])
adamc@86 669 | (L'.CConcat (c1, c2), _) =>
adamc@86 670 let
adamc@86 671 val (s1, gs1) = recordSummary (env, denv) c1
adamc@86 672 val (s2, gs2) = recordSummary (env, denv) c2
adamc@86 673 in
adamc@86 674 ({fields = #fields s1 @ #fields s2,
adamc@86 675 unifs = #unifs s1 @ #unifs s2,
adamc@86 676 others = #others s1 @ #others s2},
adamc@86 677 gs1 @ gs2)
adamc@86 678 end
adamc@86 679 | (L'.CUnif (_, _, _, ref (SOME c)), _) => recordSummary (env, denv) c
adamc@86 680 | c' as (L'.CUnif (_, _, _, r), _) => ({fields = [], unifs = [(c', r)], others = []}, [])
adamc@86 681 | c' => ({fields = [], unifs = [], others = [c']}, [])
adamc@86 682 in
adamc@86 683 (sum, gs @ gs')
adamc@86 684 end
adamc@86 685
adamc@86 686 and consEq (env, denv) (c1, c2) =
adamc@209 687 let
adamc@209 688 val gs = unifyCons (env, denv) c1 c2
adamc@209 689 in
adamc@209 690 List.all (fn (loc, env, denv, c1, c2) =>
adamc@209 691 case D.prove env denv (c1, c2, loc) of
adamc@209 692 [] => true
adamc@209 693 | _ => false) gs
adamc@209 694 end
adamc@12 695 handle CUnify _ => false
adamc@12 696
adamc@80 697 and consNeq env (c1, c2) =
adamc@86 698 case (#1 (ElabOps.hnormCon env c1), #1 (ElabOps.hnormCon env c2)) of
adamc@80 699 (L'.CName x1, L'.CName x2) => x1 <> x2
adamc@80 700 | _ => false
adamc@80 701
adamc@86 702 and unifySummaries (env, denv) (k, s1 : record_summary, s2 : record_summary) =
adamc@12 703 let
adamc@14 704 (*val () = eprefaces "Summaries" [("#1", p_summary env s1),
adamc@14 705 ("#2", p_summary env s2)]*)
adamc@12 706
adamc@12 707 fun eatMatching p (ls1, ls2) =
adamc@12 708 let
adamc@12 709 fun em (ls1, ls2, passed1) =
adamc@12 710 case ls1 of
adamc@12 711 [] => (rev passed1, ls2)
adamc@12 712 | h1 :: t1 =>
adamc@12 713 let
adamc@12 714 fun search (ls2', passed2) =
adamc@12 715 case ls2' of
adamc@12 716 [] => em (t1, ls2, h1 :: passed1)
adamc@12 717 | h2 :: t2 =>
adamc@12 718 if p (h1, h2) then
adamc@12 719 em (t1, List.revAppend (passed2, t2), passed1)
adamc@12 720 else
adamc@12 721 search (t2, h2 :: passed2)
adamc@12 722 in
adamc@12 723 search (ls2, [])
adamc@12 724 end
adamc@12 725 in
adamc@12 726 em (ls1, ls2, [])
adamc@12 727 end
adamc@12 728
adamc@12 729 val (fs1, fs2) = eatMatching (fn ((x1, c1), (x2, c2)) =>
adamc@80 730 not (consNeq env (x1, x2))
adamc@86 731 andalso consEq (env, denv) (c1, c2)
adamc@86 732 andalso consEq (env, denv) (x1, x2))
adamc@79 733 (#fields s1, #fields s2)
adamc@14 734 (*val () = eprefaces "Summaries2" [("#1", p_summary env {fields = fs1, unifs = #unifs s1, others = #others s1}),
adamc@14 735 ("#2", p_summary env {fields = fs2, unifs = #unifs s2, others = #others s2})]*)
adamc@12 736 val (unifs1, unifs2) = eatMatching (fn ((_, r1), (_, r2)) => r1 = r2) (#unifs s1, #unifs s2)
adamc@86 737 val (others1, others2) = eatMatching (consEq (env, denv)) (#others s1, #others s2)
adamc@12 738
adamc@12 739 fun unifFields (fs, others, unifs) =
adamc@12 740 case (fs, others, unifs) of
adamc@12 741 ([], [], _) => ([], [], unifs)
adamc@12 742 | (_, _, []) => (fs, others, [])
adamc@12 743 | (_, _, (_, r) :: rest) =>
adamc@12 744 let
adamc@12 745 val r' = ref NONE
adamc@141 746 val kr = (L'.KRecord k, dummy)
adamc@141 747 val cr' = (L'.CUnif (dummy, kr, "recd", r'), dummy)
adamc@12 748
adamc@12 749 val prefix = case (fs, others) of
adamc@12 750 ([], other :: others) =>
adamc@12 751 List.foldl (fn (other, c) =>
adamc@12 752 (L'.CConcat (c, other), dummy))
adamc@12 753 other others
adamc@12 754 | (fs, []) =>
adamc@12 755 (L'.CRecord (k, fs), dummy)
adamc@12 756 | (fs, others) =>
adamc@12 757 List.foldl (fn (other, c) =>
adamc@12 758 (L'.CConcat (c, other), dummy))
adamc@12 759 (L'.CRecord (k, fs), dummy) others
adamc@12 760 in
adamc@12 761 r := SOME (L'.CConcat (prefix, cr'), dummy);
adamc@12 762 ([], [], (cr', r') :: rest)
adamc@12 763 end
adamc@12 764
adamc@12 765 val (fs1, others1, unifs2) = unifFields (fs1, others1, unifs2)
adamc@12 766 val (fs2, others2, unifs1) = unifFields (fs2, others2, unifs1)
adamc@12 767
adamc@86 768 val clear = case (fs1, others1, fs2, others2) of
adamc@86 769 ([], [], [], []) => true
adamc@12 770 | _ => false
adamc@12 771 val empty = (L'.CRecord (k, []), dummy)
adamc@12 772 fun pairOffUnifs (unifs1, unifs2) =
adamc@12 773 case (unifs1, unifs2) of
adamc@12 774 ([], _) =>
adamc@86 775 if clear then
adamc@12 776 List.app (fn (_, r) => r := SOME empty) unifs2
adamc@12 777 else
adamc@153 778 raise CUnify' (CRecordFailure (p_summary env s1, p_summary env s2))
adamc@12 779 | (_, []) =>
adamc@86 780 if clear then
adamc@12 781 List.app (fn (_, r) => r := SOME empty) unifs1
adamc@12 782 else
adamc@153 783 raise CUnify' (CRecordFailure (p_summary env s1, p_summary env s2))
adamc@12 784 | ((c1, _) :: rest1, (_, r2) :: rest2) =>
adamc@12 785 (r2 := SOME c1;
adamc@12 786 pairOffUnifs (rest1, rest2))
adamc@12 787 in
adamc@12 788 pairOffUnifs (unifs1, unifs2)
adamc@12 789 end
adamc@12 790
adamc@86 791 and unifyCons' (env, denv) c1 c2 =
adamc@86 792 let
adamc@86 793 val (c1, gs1) = hnormCon (env, denv) c1
adamc@86 794 val (c2, gs2) = hnormCon (env, denv) c2
adamc@86 795 in
adamc@205 796 let
adamc@205 797 val gs3 = unifyCons'' (env, denv) c1 c2
adamc@205 798 in
adamc@205 799 gs1 @ gs2 @ gs3
adamc@205 800 end
adamc@205 801 handle ex =>
adamc@205 802 let
adamc@205 803 val loc = #2 c1
adamc@205 804
adamc@205 805 fun unfold (dom, f, i, r, c) =
adamc@205 806 let
adamc@205 807 val nm = cunif (loc, (L'.KName, loc))
adamc@205 808 val v = cunif (loc, dom)
adamc@205 809 val rest = cunif (loc, (L'.KRecord dom, loc))
adamc@205 810
adamc@205 811 val (iS, gs3) = summarizeCon (env, denv) i
adamc@205 812
adamc@205 813 val app = (L'.CApp (f, nm), loc)
adamc@205 814 val app = (L'.CApp (app, v), loc)
adamc@205 815 val app = (L'.CApp (app, rest), loc)
adamc@205 816 val (appS, gs4) = summarizeCon (env, denv) app
adamc@205 817
adamc@205 818 val (cS, gs5) = summarizeCon (env, denv) c
adamc@205 819 in
adamc@205 820 (*prefaces "Summaries" [("iS", p_con_summary iS),
adamc@205 821 ("appS", p_con_summary appS),
adamc@205 822 ("cS", p_con_summary cS)];*)
adamc@205 823
adamc@205 824 if compatible (iS, appS) then
adamc@205 825 raise ex
adamc@205 826 else if compatible (cS, iS) then
adamc@205 827 let
adamc@205 828 (*val () = prefaces "Same?" [("i", p_con env i),
adamc@205 829 ("c", p_con env c)]*)
adamc@205 830 val gs6 = unifyCons (env, denv) i c
adamc@205 831 (*val () = TextIO.print "Yes!\n"*)
adamc@205 832
adamc@205 833 val gs7 = unifyCons (env, denv) r (L'.CRecord (dom, []), loc)
adamc@205 834 in
adamc@205 835 gs1 @ gs2 @ gs3 @ gs4 @ gs5 @ gs6 @ gs7
adamc@205 836 end
adamc@205 837 else if compatible (cS, appS) then
adamc@205 838 let
adamc@205 839 (*val () = prefaces "Same?" [("app", p_con env app),
adamc@205 840 ("c", p_con env c),
adamc@205 841 ("app'", p_con env (#1 (hnormCon (env, denv) app)))]*)
adamc@205 842 val gs6 = unifyCons (env, denv) app c
adamc@205 843 (*val () = TextIO.print "Yes!\n"*)
adamc@205 844
adamc@205 845 val singleton = (L'.CRecord (dom, [(nm, v)]), loc)
adamc@205 846 val concat = (L'.CConcat (singleton, rest), loc)
adamc@205 847 val gs7 = unifyCons (env, denv) r concat
adamc@205 848 in
adamc@206 849 gs1 @ gs2 @ gs3 @ gs4 @ gs5 @ gs6 @ gs7
adamc@205 850 end
adamc@205 851 else
adamc@205 852 raise ex
adamc@205 853 end
adamc@205 854 handle _ => raise ex
adamc@205 855 in
adamc@205 856 case (#1 c1, #1 c2) of
adamc@205 857 (L'.CApp ((L'.CApp ((L'.CApp ((L'.CFold (dom, _), _), f), _), i), _), r), _) =>
adamc@205 858 unfold (dom, f, i, r, c2)
adamc@205 859 | (_, L'.CApp ((L'.CApp ((L'.CApp ((L'.CFold (dom, _), _), f), _), i), _), r)) =>
adamc@205 860 unfold (dom, f, i, r, c1)
adamc@205 861 | _ => raise ex
adamc@205 862 end
adamc@86 863 end
adamc@11 864
adamc@205 865 and unifyCons'' (env, denv) (c1All as (c1, loc)) (c2All as (c2, _)) =
adamc@10 866 let
adamc@210 867 fun err f = raise CUnify' (f (c1All, c2All))
adamc@12 868
adamc@86 869 fun isRecord () = unifyRecordCons (env, denv) (c1All, c2All)
adamc@10 870 in
adamc@92 871 (*eprefaces "unifyCons''" [("c1All", p_con env c1All),
adamc@92 872 ("c2All", p_con env c2All)];*)
adamc@92 873
adamc@10 874 case (c1, c2) of
adamc@88 875 (L'.CUnit, L'.CUnit) => []
adamc@88 876
adamc@88 877 | (L'.TFun (d1, r1), L'.TFun (d2, r2)) =>
adamc@86 878 unifyCons' (env, denv) d1 d2
adamc@86 879 @ unifyCons' (env, denv) r1 r2
adamc@10 880 | (L'.TCFun (expl1, x1, d1, r1), L'.TCFun (expl2, _, d2, r2)) =>
adamc@10 881 if expl1 <> expl2 then
adamc@10 882 err CExplicitness
adamc@10 883 else
adamc@10 884 (unifyKinds d1 d2;
adamc@86 885 unifyCons' (E.pushCRel env x1 d1, D.enter denv) r1 r2)
adamc@86 886 | (L'.TRecord r1, L'.TRecord r2) => unifyCons' (env, denv) r1 r2
adamc@10 887
adamc@10 888 | (L'.CRel n1, L'.CRel n2) =>
adamc@10 889 if n1 = n2 then
adamc@86 890 []
adamc@10 891 else
adamc@10 892 err CIncompatible
adamc@10 893 | (L'.CNamed n1, L'.CNamed n2) =>
adamc@10 894 if n1 = n2 then
adamc@86 895 []
adamc@10 896 else
adamc@10 897 err CIncompatible
adamc@10 898
adamc@10 899 | (L'.CApp (d1, r1), L'.CApp (d2, r2)) =>
adamc@86 900 (unifyCons' (env, denv) d1 d2;
adamc@86 901 unifyCons' (env, denv) r1 r2)
adamc@10 902 | (L'.CAbs (x1, k1, c1), L'.CAbs (_, k2, c2)) =>
adamc@10 903 (unifyKinds k1 k2;
adamc@86 904 unifyCons' (E.pushCRel env x1 k1, D.enter denv) c1 c2)
adamc@10 905
adamc@10 906 | (L'.CName n1, L'.CName n2) =>
adamc@10 907 if n1 = n2 then
adamc@86 908 []
adamc@10 909 else
adamc@10 910 err CIncompatible
adamc@10 911
adamc@34 912 | (L'.CModProj (n1, ms1, x1), L'.CModProj (n2, ms2, x2)) =>
adamc@34 913 if n1 = n2 andalso ms1 = ms2 andalso x1 = x2 then
adamc@86 914 []
adamc@34 915 else
adamc@34 916 err CIncompatible
adamc@34 917
adamc@207 918 | (L'.CTuple cs1, L'.CTuple cs2) =>
adamc@207 919 ((ListPair.foldlEq (fn (c1, c2, gs) =>
adamc@207 920 let
adamc@207 921 val gs' = unifyCons' (env, denv) c1 c2
adamc@207 922 in
adamc@207 923 gs' @ gs
adamc@207 924 end) [] (cs1, cs2))
adamc@207 925 handle ListPair.UnequalLengths => err CIncompatible)
adamc@207 926 | (L'.CProj (c1, n1), L'.CProj (c2, n2)) =>
adamc@207 927 if n1 = n2 then
adamc@207 928 unifyCons' (env, denv) c1 c2
adamc@207 929 else
adamc@207 930 err CIncompatible
adamc@207 931
adamc@86 932 | (L'.CError, _) => []
adamc@86 933 | (_, L'.CError) => []
adamc@10 934
adamc@92 935 | (L'.CRecord _, _) => isRecord ()
adamc@92 936 | (_, L'.CRecord _) => isRecord ()
adamc@92 937 | (L'.CConcat _, _) => isRecord ()
adamc@92 938 | (_, L'.CConcat _) => isRecord ()
adamc@10 939
adamc@76 940 | (L'.CUnif (_, k1, _, r1), L'.CUnif (_, k2, _, r2)) =>
adamc@10 941 if r1 = r2 then
adamc@86 942 []
adamc@10 943 else
adamc@10 944 (unifyKinds k1 k2;
adamc@86 945 r1 := SOME c2All;
adamc@86 946 [])
adamc@10 947
adamc@76 948 | (L'.CUnif (_, _, _, r), _) =>
adamc@10 949 if occursCon r c2All then
adamc@10 950 err COccursCheckFailed
adamc@10 951 else
adamc@86 952 (r := SOME c2All;
adamc@86 953 [])
adamc@76 954 | (_, L'.CUnif (_, _, _, r)) =>
adamc@10 955 if occursCon r c1All then
adamc@10 956 err COccursCheckFailed
adamc@10 957 else
adamc@86 958 (r := SOME c1All;
adamc@86 959 [])
adamc@10 960
adamc@71 961 | (L'.CFold (dom1, ran1), L'.CFold (dom2, ran2)) =>
adamc@71 962 (unifyKinds dom1 dom2;
adamc@86 963 unifyKinds ran1 ran2;
adamc@86 964 [])
adamc@71 965
adamc@10 966 | _ => err CIncompatible
adamc@10 967 end
adamc@10 968
adamc@86 969 and unifyCons (env, denv) c1 c2 =
adamc@86 970 unifyCons' (env, denv) c1 c2
adamc@10 971 handle CUnify' err => raise CUnify (c1, c2, err)
adamc@10 972 | KUnify args => raise CUnify (c1, c2, CKind args)
adamc@10 973
adamc@10 974 datatype exp_error =
adamc@10 975 UnboundExp of ErrorMsg.span * string
adamc@34 976 | UnboundStrInExp of ErrorMsg.span * string
adamc@10 977 | Unify of L'.exp * L'.con * L'.con * cunify_error
adamc@11 978 | Unif of string * L'.con
adamc@11 979 | WrongForm of string * L'.exp * L'.con
adamc@92 980 | IncompatibleCons of L'.con * L'.con
adamc@171 981 | DuplicatePatternVariable of ErrorMsg.span * string
adamc@171 982 | PatUnify of L'.pat * L'.con * L'.con * cunify_error
adamc@174 983 | UnboundConstructor of ErrorMsg.span * string list * string
adamc@171 984 | PatHasArg of ErrorMsg.span
adamc@171 985 | PatHasNoArg of ErrorMsg.span
adamc@172 986 | Inexhaustive of ErrorMsg.span
adamc@175 987 | DuplicatePatField of ErrorMsg.span * string
adamc@211 988 | Unresolvable of ErrorMsg.span * L'.con
adamc@211 989 | OutOfContext of ErrorMsg.span
adamc@10 990
adamc@10 991 fun expError env err =
adamc@10 992 case err of
adamc@10 993 UnboundExp (loc, s) =>
adamc@10 994 ErrorMsg.errorAt loc ("Unbound expression variable " ^ s)
adamc@34 995 | UnboundStrInExp (loc, s) =>
adamc@34 996 ErrorMsg.errorAt loc ("Unbound structure " ^ s)
adamc@10 997 | Unify (e, c1, c2, uerr) =>
adamc@10 998 (ErrorMsg.errorAt (#2 e) "Unification failure";
adamc@10 999 eprefaces' [("Expression", p_exp env e),
adamc@10 1000 ("Have con", p_con env c1),
adamc@10 1001 ("Need con", p_con env c2)];
adamc@10 1002 cunifyError env uerr)
adamc@11 1003 | Unif (action, c) =>
adamc@11 1004 (ErrorMsg.errorAt (#2 c) ("Unification variable blocks " ^ action);
adamc@11 1005 eprefaces' [("Con", p_con env c)])
adamc@11 1006 | WrongForm (variety, e, t) =>
adamc@11 1007 (ErrorMsg.errorAt (#2 e) ("Expression is not a " ^ variety);
adamc@11 1008 eprefaces' [("Expression", p_exp env e),
adamc@11 1009 ("Type", p_con env t)])
adamc@92 1010 | IncompatibleCons (c1, c2) =>
adamc@92 1011 (ErrorMsg.errorAt (#2 c1) "Incompatible constructors";
adamc@92 1012 eprefaces' [("Con 1", p_con env c1),
adamc@92 1013 ("Con 2", p_con env c2)])
adamc@171 1014 | DuplicatePatternVariable (loc, s) =>
adamc@171 1015 ErrorMsg.errorAt loc ("Duplicate pattern variable " ^ s)
adamc@171 1016 | PatUnify (p, c1, c2, uerr) =>
adamc@171 1017 (ErrorMsg.errorAt (#2 p) "Unification failure for pattern";
adamc@171 1018 eprefaces' [("Pattern", p_pat env p),
adamc@171 1019 ("Have con", p_con env c1),
adamc@171 1020 ("Need con", p_con env c2)];
adamc@171 1021 cunifyError env uerr)
adamc@174 1022 | UnboundConstructor (loc, ms, s) =>
adamc@174 1023 ErrorMsg.errorAt loc ("Unbound constructor " ^ String.concatWith "." (ms @ [s]) ^ " in pattern")
adamc@171 1024 | PatHasArg loc =>
adamc@171 1025 ErrorMsg.errorAt loc "Constructor expects no argument but is used with argument"
adamc@171 1026 | PatHasNoArg loc =>
adamc@171 1027 ErrorMsg.errorAt loc "Constructor expects argument but is used with no argument"
adamc@172 1028 | Inexhaustive loc =>
adamc@172 1029 ErrorMsg.errorAt loc "Inexhaustive 'case'"
adamc@175 1030 | DuplicatePatField (loc, s) =>
adamc@175 1031 ErrorMsg.errorAt loc ("Duplicate record field " ^ s ^ " in pattern")
adamc@211 1032 | OutOfContext loc =>
adamc@211 1033 ErrorMsg.errorAt loc "Type class wildcard occurs out of context"
adamc@211 1034 | Unresolvable (loc, c) =>
adamc@211 1035 (ErrorMsg.errorAt loc "Can't resolve type class instance";
adamc@211 1036 eprefaces' [("Class constraint", p_con env c)])
adamc@210 1037
adamc@86 1038 fun checkCon (env, denv) e c1 c2 =
adamc@86 1039 unifyCons (env, denv) c1 c2
adamc@10 1040 handle CUnify (c1, c2, err) =>
adamc@86 1041 (expError env (Unify (e, c1, c2, err));
adamc@86 1042 [])
adamc@10 1043
adamc@171 1044 fun checkPatCon (env, denv) p c1 c2 =
adamc@171 1045 unifyCons (env, denv) c1 c2
adamc@171 1046 handle CUnify (c1, c2, err) =>
adamc@171 1047 (expError env (PatUnify (p, c1, c2, err));
adamc@171 1048 [])
adamc@171 1049
adamc@14 1050 fun primType env p =
adamc@56 1051 case p of
adamc@56 1052 P.Int _ => !int
adamc@56 1053 | P.Float _ => !float
adamc@56 1054 | P.String _ => !string
adamc@14 1055
adamc@71 1056 fun recCons (k, nm, v, rest, loc) =
adamc@71 1057 (L'.CConcat ((L'.CRecord (k, [(nm, v)]), loc),
adamc@71 1058 rest), loc)
adamc@71 1059
adamc@71 1060 fun foldType (dom, loc) =
adamc@71 1061 (L'.TCFun (L'.Explicit, "ran", (L'.KArrow ((L'.KRecord dom, loc), (L'.KType, loc)), loc),
adamc@71 1062 (L'.TFun ((L'.TCFun (L'.Explicit, "nm", (L'.KName, loc),
adamc@71 1063 (L'.TCFun (L'.Explicit, "v", dom,
adamc@71 1064 (L'.TCFun (L'.Explicit, "rest", (L'.KRecord dom, loc),
adamc@71 1065 (L'.TFun ((L'.CApp ((L'.CRel 3, loc), (L'.CRel 0, loc)), loc),
adamc@71 1066 (L'.CApp ((L'.CRel 3, loc),
adamc@71 1067 recCons (dom,
adamc@71 1068 (L'.CRel 2, loc),
adamc@71 1069 (L'.CRel 1, loc),
adamc@71 1070 (L'.CRel 0, loc),
adamc@71 1071 loc)), loc)), loc)),
adamc@71 1072 loc)), loc)), loc),
adamc@71 1073 (L'.TFun ((L'.CApp ((L'.CRel 0, loc), (L'.CRecord (dom, []), loc)), loc),
adamc@71 1074 (L'.TCFun (L'.Explicit, "r", (L'.KRecord dom, loc),
adamc@71 1075 (L'.CApp ((L'.CRel 1, loc), (L'.CRel 0, loc)), loc)), loc)),
adamc@71 1076 loc)), loc)), loc)
adamc@71 1077
adamc@86 1078 fun elabHead (env, denv) (e as (_, loc)) t =
adamc@15 1079 let
adamc@15 1080 fun unravel (t, e) =
adamc@86 1081 let
adamc@86 1082 val (t, gs) = hnormCon (env, denv) t
adamc@86 1083 in
adamc@86 1084 case t of
adamc@86 1085 (L'.TCFun (L'.Implicit, x, k, t'), _) =>
adamc@86 1086 let
adamc@86 1087 val u = cunif (loc, k)
adamc@86 1088
adamc@86 1089 val (e, t, gs') = unravel (subConInCon (0, u) t',
adamc@86 1090 (L'.ECApp (e, u), loc))
adamc@86 1091 in
adamc@86 1092 (e, t, gs @ gs')
adamc@86 1093 end
adamc@86 1094 | _ => (e, t, gs)
adamc@86 1095 end
adamc@15 1096 in
adamc@15 1097 unravel (t, e)
adamc@15 1098 end
adamc@15 1099
adamc@174 1100 fun elabPat (pAll as (p, loc), (env, denv, bound)) =
adamc@171 1101 let
adamc@171 1102 val perror = (L'.PWild, loc)
adamc@171 1103 val terror = (L'.CError, loc)
adamc@171 1104 val pterror = (perror, terror)
adamc@171 1105 val rerror = (pterror, (env, bound))
adamc@171 1106
adamc@191 1107 fun pcon (pc, po, xs, to, dn, dk) =
adamc@188 1108 case (po, to) of
adamc@188 1109 (NONE, SOME _) => (expError env (PatHasNoArg loc);
adamc@188 1110 rerror)
adamc@188 1111 | (SOME _, NONE) => (expError env (PatHasArg loc);
adamc@188 1112 rerror)
adamc@191 1113 | (NONE, NONE) =>
adamc@191 1114 let
adamc@191 1115 val k = (L'.KType, loc)
adamc@191 1116 val unifs = map (fn _ => cunif (loc, k)) xs
adamc@191 1117 val dn = foldl (fn (u, dn) => (L'.CApp (dn, u), loc)) dn unifs
adamc@191 1118 in
adamc@191 1119 (((L'.PCon (dk, pc, unifs, NONE), loc), dn),
adamc@191 1120 (env, bound))
adamc@191 1121 end
adamc@188 1122 | (SOME p, SOME t) =>
adamc@188 1123 let
adamc@188 1124 val ((p', pt), (env, bound)) = elabPat (p, (env, denv, bound))
adamc@191 1125
adamc@191 1126 val k = (L'.KType, loc)
adamc@191 1127 val unifs = map (fn _ => cunif (loc, k)) xs
adamc@194 1128 val nxs = length unifs - 1
adamc@194 1129 val t = ListUtil.foldli (fn (i, u, t) => subConInCon (nxs - i, u) t) t unifs
adamc@191 1130 val dn = foldl (fn (u, dn) => (L'.CApp (dn, u), loc)) dn unifs
adamc@188 1131 in
adamc@191 1132 ignore (checkPatCon (env, denv) p' pt t);
adamc@191 1133 (((L'.PCon (dk, pc, unifs, SOME p'), loc), dn),
adamc@188 1134 (env, bound))
adamc@188 1135 end
adamc@171 1136 in
adamc@171 1137 case p of
adamc@171 1138 L.PWild => (((L'.PWild, loc), cunif (loc, (L'.KType, loc))),
adamc@171 1139 (env, bound))
adamc@171 1140 | L.PVar x =>
adamc@171 1141 let
adamc@171 1142 val t = if SS.member (bound, x) then
adamc@171 1143 (expError env (DuplicatePatternVariable (loc, x));
adamc@171 1144 terror)
adamc@171 1145 else
adamc@171 1146 cunif (loc, (L'.KType, loc))
adamc@171 1147 in
adamc@182 1148 (((L'.PVar (x, t), loc), t),
adamc@171 1149 (E.pushERel env x t, SS.add (bound, x)))
adamc@171 1150 end
adamc@173 1151 | L.PPrim p => (((L'.PPrim p, loc), primType env p),
adamc@173 1152 (env, bound))
adamc@171 1153 | L.PCon ([], x, po) =>
adamc@171 1154 (case E.lookupConstructor env x of
adamc@174 1155 NONE => (expError env (UnboundConstructor (loc, [], x));
adamc@171 1156 rerror)
adamc@191 1157 | SOME (dk, n, xs, to, dn) => pcon (L'.PConVar n, po, xs, to, (L'.CNamed dn, loc), dk))
adamc@174 1158 | L.PCon (m1 :: ms, x, po) =>
adamc@174 1159 (case E.lookupStr env m1 of
adamc@174 1160 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@174 1161 rerror)
adamc@174 1162 | SOME (n, sgn) =>
adamc@174 1163 let
adamc@174 1164 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@174 1165 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@182 1166 NONE => raise Fail "elabPat: Unknown substructure"
adamc@174 1167 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@174 1168 ((L'.StrVar n, loc), sgn) ms
adamc@174 1169 in
adamc@174 1170 case E.projectConstructor env {str = str, sgn = sgn, field = x} of
adamc@174 1171 NONE => (expError env (UnboundConstructor (loc, m1 :: ms, x));
adamc@174 1172 rerror)
adamc@191 1173 | SOME (dk, _, xs, to, dn) => pcon (L'.PConProj (n, ms, x), po, xs, to, dn, dk)
adamc@174 1174 end)
adamc@174 1175
adamc@175 1176 | L.PRecord (xps, flex) =>
adamc@175 1177 let
adamc@175 1178 val (xpts, (env, bound, _)) =
adamc@175 1179 ListUtil.foldlMap (fn ((x, p), (env, bound, fbound)) =>
adamc@175 1180 let
adamc@175 1181 val ((p', t), (env, bound)) = elabPat (p, (env, denv, bound))
adamc@175 1182 in
adamc@175 1183 if SS.member (fbound, x) then
adamc@175 1184 expError env (DuplicatePatField (loc, x))
adamc@175 1185 else
adamc@175 1186 ();
adamc@175 1187 ((x, p', t), (env, bound, SS.add (fbound, x)))
adamc@175 1188 end)
adamc@175 1189 (env, bound, SS.empty) xps
adamc@175 1190
adamc@175 1191 val k = (L'.KType, loc)
adamc@175 1192 val c = (L'.CRecord (k, map (fn (x, _, t) => ((L'.CName x, loc), t)) xpts), loc)
adamc@176 1193 val c =
adamc@175 1194 if flex then
adamc@176 1195 (L'.CConcat (c, cunif (loc, (L'.KRecord k, loc))), loc)
adamc@175 1196 else
adamc@176 1197 c
adamc@175 1198 in
adamc@182 1199 (((L'.PRecord xpts, loc),
adamc@175 1200 (L'.TRecord c, loc)),
adamc@175 1201 (env, bound))
adamc@175 1202 end
adamc@175 1203
adamc@171 1204 end
adamc@171 1205
adamc@172 1206 datatype coverage =
adamc@172 1207 Wild
adamc@173 1208 | None
adamc@172 1209 | Datatype of coverage IM.map
adamc@175 1210 | Record of coverage SM.map list
adamc@172 1211
adamc@172 1212 fun exhaustive (env, denv, t, ps) =
adamc@172 1213 let
adamc@172 1214 fun pcCoverage pc =
adamc@172 1215 case pc of
adamc@172 1216 L'.PConVar n => n
adamc@174 1217 | L'.PConProj (m1, ms, x) =>
adamc@174 1218 let
adamc@174 1219 val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@174 1220 in
adamc@174 1221 case E.projectConstructor env {str = str, sgn = sgn, field = x} of
adamc@174 1222 NONE => raise Fail "exhaustive: Can't project constructor"
adamc@191 1223 | SOME (_, n, _, _, _) => n
adamc@174 1224 end
adamc@172 1225
adamc@172 1226 fun coverage (p, _) =
adamc@172 1227 case p of
adamc@172 1228 L'.PWild => Wild
adamc@172 1229 | L'.PVar _ => Wild
adamc@173 1230 | L'.PPrim _ => None
adamc@191 1231 | L'.PCon (_, pc, _, NONE) => Datatype (IM.insert (IM.empty, pcCoverage pc, Wild))
adamc@191 1232 | L'.PCon (_, pc, _, SOME p) => Datatype (IM.insert (IM.empty, pcCoverage pc, coverage p))
adamc@182 1233 | L'.PRecord xps => Record [foldl (fn ((x, p, _), fmap) =>
adamc@182 1234 SM.insert (fmap, x, coverage p)) SM.empty xps]
adamc@176 1235
adamc@172 1236 fun merge (c1, c2) =
adamc@172 1237 case (c1, c2) of
adamc@173 1238 (None, _) => c2
adamc@173 1239 | (_, None) => c1
adamc@173 1240
adamc@173 1241 | (Wild, _) => Wild
adamc@172 1242 | (_, Wild) => Wild
adamc@172 1243
adamc@172 1244 | (Datatype cm1, Datatype cm2) => Datatype (IM.unionWith merge (cm1, cm2))
adamc@172 1245
adamc@175 1246 | (Record fm1, Record fm2) => Record (fm1 @ fm2)
adamc@175 1247
adamc@175 1248 | _ => None
adamc@175 1249
adamc@172 1250 fun combinedCoverage ps =
adamc@172 1251 case ps of
adamc@172 1252 [] => raise Fail "Empty pattern list for coverage checking"
adamc@172 1253 | [p] => coverage p
adamc@172 1254 | p :: ps => merge (coverage p, combinedCoverage ps)
adamc@172 1255
adamc@175 1256 fun enumerateCases t =
adamc@175 1257 let
adamc@175 1258 fun dtype cons =
adamc@175 1259 ListUtil.mapConcat (fn (_, n, to) =>
adamc@175 1260 case to of
adamc@175 1261 NONE => [Datatype (IM.insert (IM.empty, n, Wild))]
adamc@175 1262 | SOME t => map (fn c => Datatype (IM.insert (IM.empty, n, c)))
adamc@175 1263 (enumerateCases t)) cons
adamc@175 1264 in
adamc@175 1265 case #1 (#1 (hnormCon (env, denv) t)) of
adamc@175 1266 L'.CNamed n =>
adamc@175 1267 (let
adamc@175 1268 val dt = E.lookupDatatype env n
adamc@175 1269 val cons = E.constructors dt
adamc@175 1270 in
adamc@175 1271 dtype cons
adamc@175 1272 end handle E.UnboundNamed _ => [Wild])
adamc@175 1273 | L'.TRecord c =>
adamc@175 1274 (case #1 (#1 (hnormCon (env, denv) c)) of
adamc@175 1275 L'.CRecord (_, xts) =>
adamc@175 1276 let
adamc@175 1277 val xts = map (fn (x, t) => (#1 (hnormCon (env, denv) x), t)) xts
adamc@175 1278
adamc@175 1279 fun exponentiate fs =
adamc@175 1280 case fs of
adamc@175 1281 [] => [SM.empty]
adamc@175 1282 | ((L'.CName x, _), t) :: rest =>
adamc@175 1283 let
adamc@175 1284 val this = enumerateCases t
adamc@175 1285 val rest = exponentiate rest
adamc@175 1286 in
adamc@175 1287 ListUtil.mapConcat (fn fmap =>
adamc@175 1288 map (fn c => SM.insert (fmap, x, c)) this) rest
adamc@175 1289 end
adamc@175 1290 | _ => raise Fail "exponentiate: Not CName"
adamc@175 1291 in
adamc@175 1292 if List.exists (fn ((L'.CName _, _), _) => false
adamc@175 1293 | (c, _) => true) xts then
adamc@175 1294 [Wild]
adamc@175 1295 else
adamc@175 1296 map (fn ls => Record [ls]) (exponentiate xts)
adamc@175 1297 end
adamc@175 1298 | _ => [Wild])
adamc@175 1299 | _ => [Wild]
adamc@175 1300 end
adamc@175 1301
adamc@175 1302 fun coverageImp (c1, c2) =
adamc@175 1303 case (c1, c2) of
adamc@175 1304 (Wild, _) => true
adamc@175 1305
adamc@175 1306 | (Datatype cmap1, Datatype cmap2) =>
adamc@175 1307 List.all (fn (n, c2) =>
adamc@175 1308 case IM.find (cmap1, n) of
adamc@175 1309 NONE => false
adamc@175 1310 | SOME c1 => coverageImp (c1, c2)) (IM.listItemsi cmap2)
adamc@175 1311
adamc@175 1312 | (Record fmaps1, Record fmaps2) =>
adamc@175 1313 List.all (fn fmap2 =>
adamc@175 1314 List.exists (fn fmap1 =>
adamc@175 1315 List.all (fn (x, c2) =>
adamc@175 1316 case SM.find (fmap1, x) of
adamc@175 1317 NONE => true
adamc@175 1318 | SOME c1 => coverageImp (c1, c2))
adamc@175 1319 (SM.listItemsi fmap2))
adamc@175 1320 fmaps1) fmaps2
adamc@175 1321
adamc@175 1322 | _ => false
adamc@175 1323
adamc@172 1324 fun isTotal (c, t) =
adamc@172 1325 case c of
adamc@173 1326 None => (false, [])
adamc@173 1327 | Wild => (true, [])
adamc@172 1328 | Datatype cm =>
adamc@172 1329 let
adamc@172 1330 val ((t, _), gs) = hnormCon (env, denv) t
adamc@174 1331
adamc@174 1332 fun dtype cons =
adamc@174 1333 foldl (fn ((_, n, to), (total, gs)) =>
adamc@174 1334 case IM.find (cm, n) of
adamc@174 1335 NONE => (false, gs)
adamc@174 1336 | SOME c' =>
adamc@174 1337 case to of
adamc@174 1338 NONE => (total, gs)
adamc@174 1339 | SOME t' =>
adamc@174 1340 let
adamc@174 1341 val (total, gs') = isTotal (c', t')
adamc@174 1342 in
adamc@174 1343 (total, gs' @ gs)
adamc@174 1344 end)
adamc@174 1345 (true, gs) cons
adamc@191 1346
adamc@191 1347 fun unapp t =
adamc@191 1348 case t of
adamc@191 1349 L'.CApp ((t, _), _) => unapp t
adamc@191 1350 | _ => t
adamc@172 1351 in
adamc@191 1352 case unapp t of
adamc@172 1353 L'.CNamed n =>
adamc@172 1354 let
adamc@172 1355 val dt = E.lookupDatatype env n
adamc@172 1356 val cons = E.constructors dt
adamc@172 1357 in
adamc@174 1358 dtype cons
adamc@174 1359 end
adamc@174 1360 | L'.CModProj (m1, ms, x) =>
adamc@174 1361 let
adamc@174 1362 val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@174 1363 in
adamc@174 1364 case E.projectDatatype env {str = str, sgn = sgn, field = x} of
adamc@174 1365 NONE => raise Fail "isTotal: Can't project datatype"
adamc@191 1366 | SOME (_, cons) => dtype cons
adamc@172 1367 end
adamc@172 1368 | L'.CError => (true, gs)
adamc@172 1369 | _ => raise Fail "isTotal: Not a datatype"
adamc@172 1370 end
adamc@175 1371 | Record _ => (List.all (fn c2 => coverageImp (c, c2)) (enumerateCases t), [])
adamc@172 1372 in
adamc@172 1373 isTotal (combinedCoverage ps, t)
adamc@172 1374 end
adamc@172 1375
adamc@217 1376 fun unmodCon env (c, loc) =
adamc@217 1377 case c of
adamc@217 1378 L'.CNamed n =>
adamc@217 1379 (case E.lookupCNamed env n of
adamc@217 1380 (_, _, SOME (c as (L'.CModProj _, _))) => unmodCon env c
adamc@217 1381 | _ => (c, loc))
adamc@217 1382 | L'.CModProj (m1, ms, x) =>
adamc@217 1383 let
adamc@217 1384 val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@217 1385 in
adamc@217 1386 case E.projectCon env {str = str, sgn = sgn, field = x} of
adamc@217 1387 NONE => raise Fail "unmodCon: Can't projectCon"
adamc@217 1388 | SOME (_, SOME (c as (L'.CModProj _, _))) => unmodCon env c
adamc@217 1389 | _ => (c, loc)
adamc@217 1390 end
adamc@217 1391 | _ => (c, loc)
adamc@217 1392
adamc@217 1393 fun normClassConstraint envs (c, loc) =
adamc@217 1394 case c of
adamc@217 1395 L'.CApp (f, x) =>
adamc@217 1396 let
adamc@217 1397 val f = unmodCon (#1 envs) f
adamc@217 1398 val (x, gs) = hnormCon envs x
adamc@217 1399 in
adamc@217 1400 ((L'.CApp (f, x), loc), gs)
adamc@217 1401 end
adamc@217 1402 | _ => ((c, loc), [])
adamc@216 1403
adamc@92 1404 fun elabExp (env, denv) (eAll as (e, loc)) =
adamc@91 1405 let
adamc@92 1406
adamc@92 1407 in
adamc@92 1408 (*eprefaces "elabExp" [("eAll", SourcePrint.p_exp eAll)];*)
adamc@10 1409
adamc@91 1410 case e of
adamc@91 1411 L.EAnnot (e, t) =>
adamc@91 1412 let
adamc@91 1413 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1414 val (t', _, gs2) = elabCon (env, denv) t
adamc@91 1415 val gs3 = checkCon (env, denv) e' et t'
adamc@91 1416 in
adamc@91 1417 (e', t', gs1 @ gs2 @ gs3)
adamc@91 1418 end
adamc@34 1419
adamc@91 1420 | L.EPrim p => ((L'.EPrim p, loc), primType env p, [])
adamc@91 1421 | L.EVar ([], s) =>
adamc@91 1422 (case E.lookupE env s of
adamc@91 1423 E.NotBound =>
adamc@91 1424 (expError env (UnboundExp (loc, s));
adamc@91 1425 (eerror, cerror, []))
adamc@91 1426 | E.Rel (n, t) => ((L'.ERel n, loc), t, [])
adamc@191 1427 | E.Named (n, t) =>
adamc@191 1428 if Char.isUpper (String.sub (s, 0)) then
adamc@191 1429 elabHead (env, denv) (L'.ENamed n, loc) t
adamc@191 1430 else
adamc@191 1431 ((L'.ENamed n, loc), t, []))
adamc@91 1432 | L.EVar (m1 :: ms, s) =>
adamc@91 1433 (case E.lookupStr env m1 of
adamc@91 1434 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@91 1435 (eerror, cerror, []))
adamc@91 1436 | SOME (n, sgn) =>
adamc@91 1437 let
adamc@91 1438 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@91 1439 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@91 1440 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@91 1441 (strerror, sgnerror))
adamc@91 1442 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@91 1443 ((L'.StrVar n, loc), sgn) ms
adamc@10 1444
adamc@91 1445 val t = case E.projectVal env {sgn = sgn, str = str, field = s} of
adamc@91 1446 NONE => (expError env (UnboundExp (loc, s));
adamc@91 1447 cerror)
adamc@91 1448 | SOME t => t
adamc@91 1449 in
adamc@91 1450 ((L'.EModProj (n, ms, s), loc), t, [])
adamc@91 1451 end)
adamc@86 1452
adamc@211 1453 | L.EApp (e1, (L.EWild, _)) =>
adamc@210 1454 let
adamc@210 1455 val (e1', t1, gs1) = elabExp (env, denv) e1
adamc@210 1456 val (e1', t1, gs2) = elabHead (env, denv) e1' t1
adamc@210 1457 val (t1, gs3) = hnormCon (env, denv) t1
adamc@210 1458 in
adamc@210 1459 case t1 of
adamc@211 1460 (L'.TFun (dom, ran), _) =>
adamc@216 1461 let
adamc@216 1462 val (dom, gs4) = normClassConstraint (env, denv) dom
adamc@216 1463 in
adamc@216 1464 case E.resolveClass env dom of
adamc@216 1465 NONE => (expError env (Unresolvable (loc, dom));
adamc@216 1466 (eerror, cerror, []))
adamc@216 1467 | SOME pf => ((L'.EApp (e1', pf), loc), ran, gs1 @ gs2 @ gs3 @ gs4)
adamc@216 1468 end
adamc@211 1469 | _ => (expError env (OutOfContext loc);
adamc@211 1470 (eerror, cerror, []))
adamc@210 1471 end
adamc@211 1472 | L.EWild => (expError env (OutOfContext loc);
adamc@211 1473 (eerror, cerror, []))
adamc@210 1474
adamc@91 1475 | L.EApp (e1, e2) =>
adamc@91 1476 let
adamc@91 1477 val (e1', t1, gs1) = elabExp (env, denv) e1
adamc@91 1478 val (e1', t1, gs2) = elabHead (env, denv) e1' t1
adamc@91 1479 val (e2', t2, gs3) = elabExp (env, denv) e2
adamc@71 1480
adamc@91 1481 val dom = cunif (loc, ktype)
adamc@91 1482 val ran = cunif (loc, ktype)
adamc@91 1483 val t = (L'.TFun (dom, ran), dummy)
adamc@91 1484
adamc@91 1485 val gs4 = checkCon (env, denv) e1' t1 t
adamc@91 1486 val gs5 = checkCon (env, denv) e2' t2 dom
adamc@205 1487
adamc@205 1488 val gs = gs1 @ gs2 @ gs3 @ gs4 @ gs5
adamc@91 1489 in
adamc@205 1490 ((L'.EApp (e1', e2'), loc), ran, gs)
adamc@91 1491 end
adamc@91 1492 | L.EAbs (x, to, e) =>
adamc@91 1493 let
adamc@91 1494 val (t', gs1) = case to of
adamc@91 1495 NONE => (cunif (loc, ktype), [])
adamc@91 1496 | SOME t =>
adamc@91 1497 let
adamc@91 1498 val (t', tk, gs) = elabCon (env, denv) t
adamc@91 1499 in
adamc@91 1500 checkKind env t' tk ktype;
adamc@91 1501 (t', gs)
adamc@91 1502 end
adamc@91 1503 val (e', et, gs2) = elabExp (E.pushERel env x t', denv) e
adamc@91 1504 in
adamc@91 1505 ((L'.EAbs (x, t', et, e'), loc),
adamc@91 1506 (L'.TFun (t', et), loc),
adamc@91 1507 gs1 @ gs2)
adamc@91 1508 end
adamc@91 1509 | L.ECApp (e, c) =>
adamc@91 1510 let
adamc@91 1511 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1512 val (e', et, gs2) = elabHead (env, denv) e' et
adamc@91 1513 val (c', ck, gs3) = elabCon (env, denv) c
adamc@91 1514 val ((et', _), gs4) = hnormCon (env, denv) et
adamc@91 1515 in
adamc@91 1516 case et' of
adamc@91 1517 L'.CError => (eerror, cerror, [])
adamc@91 1518 | L'.TCFun (_, _, k, eb) =>
adamc@91 1519 let
adamc@91 1520 val () = checkKind env c' ck k
adamc@91 1521 val eb' = subConInCon (0, c') eb
adamc@91 1522 handle SynUnif => (expError env (Unif ("substitution", eb));
adamc@91 1523 cerror)
adamc@91 1524 in
adamc@91 1525 ((L'.ECApp (e', c'), loc), eb', gs1 @ gs2 @ gs3 @ gs4)
adamc@91 1526 end
adamc@91 1527
adamc@91 1528 | L'.CUnif _ =>
adamc@91 1529 (expError env (Unif ("application", et));
adamc@91 1530 (eerror, cerror, []))
adamc@91 1531
adamc@91 1532 | _ =>
adamc@91 1533 (expError env (WrongForm ("constructor function", e', et));
adamc@91 1534 (eerror, cerror, []))
adamc@91 1535 end
adamc@91 1536 | L.ECAbs (expl, x, k, e) =>
adamc@91 1537 let
adamc@91 1538 val expl' = elabExplicitness expl
adamc@91 1539 val k' = elabKind k
adamc@91 1540 val (e', et, gs) = elabExp (E.pushCRel env x k', D.enter denv) e
adamc@91 1541 in
adamc@91 1542 ((L'.ECAbs (expl', x, k', e'), loc),
adamc@91 1543 (L'.TCFun (expl', x, k', et), loc),
adamc@91 1544 gs)
adamc@91 1545 end
adamc@91 1546
adamc@91 1547 | L.EDisjoint (c1, c2, e) =>
adamc@91 1548 let
adamc@91 1549 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@91 1550 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@91 1551
adamc@91 1552 val ku1 = kunif loc
adamc@91 1553 val ku2 = kunif loc
adamc@91 1554
adamc@91 1555 val (denv', gs3) = D.assert env denv (c1', c2')
adamc@91 1556 val (e', t, gs4) = elabExp (env, denv') e
adamc@91 1557 in
adamc@91 1558 checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@91 1559 checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@91 1560
adamc@91 1561 (e', (L'.TDisjoint (c1', c2', t), loc), gs1 @ gs2 @ gs3 @ gs4)
adamc@91 1562 end
adamc@91 1563
adamc@91 1564 | L.ERecord xes =>
adamc@91 1565 let
adamc@91 1566 val (xes', gs) = ListUtil.foldlMap (fn ((x, e), gs) =>
adamc@91 1567 let
adamc@91 1568 val (x', xk, gs1) = elabCon (env, denv) x
adamc@91 1569 val (e', et, gs2) = elabExp (env, denv) e
adamc@91 1570 in
adamc@91 1571 checkKind env x' xk kname;
adamc@91 1572 ((x', e', et), gs1 @ gs2 @ gs)
adamc@91 1573 end)
adamc@91 1574 [] xes
adamc@91 1575
adamc@91 1576 val k = (L'.KType, loc)
adamc@91 1577
adamc@91 1578 fun prove (xets, gs) =
adamc@91 1579 case xets of
adamc@91 1580 [] => gs
adamc@91 1581 | (x, _, t) :: rest =>
adamc@91 1582 let
adamc@91 1583 val xc = (x, t)
adamc@91 1584 val r1 = (L'.CRecord (k, [xc]), loc)
adamc@91 1585 val gs = foldl (fn ((x', _, t'), gs) =>
adamc@91 1586 let
adamc@91 1587 val xc' = (x', t')
adamc@91 1588 val r2 = (L'.CRecord (k, [xc']), loc)
adamc@91 1589 in
adamc@91 1590 D.prove env denv (r1, r2, loc) @ gs
adamc@91 1591 end)
adamc@91 1592 gs rest
adamc@91 1593 in
adamc@91 1594 prove (rest, gs)
adamc@91 1595 end
adamc@91 1596 in
adamc@91 1597 ((L'.ERecord xes', loc),
adamc@91 1598 (L'.TRecord (L'.CRecord (ktype, map (fn (x', _, et) => (x', et)) xes'), loc), loc),
adamc@91 1599 prove (xes', gs))
adamc@91 1600 end
adamc@91 1601
adamc@91 1602 | L.EField (e, c) =>
adamc@91 1603 let
adamc@91 1604 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1605 val (c', ck, gs2) = elabCon (env, denv) c
adamc@91 1606
adamc@91 1607 val ft = cunif (loc, ktype)
adamc@91 1608 val rest = cunif (loc, ktype_record)
adamc@91 1609 val first = (L'.CRecord (ktype, [(c', ft)]), loc)
adamc@91 1610
adamc@91 1611 val gs3 =
adamc@91 1612 checkCon (env, denv) e' et
adamc@91 1613 (L'.TRecord (L'.CConcat (first, rest), loc), loc)
adamc@91 1614 val gs4 = D.prove env denv (first, rest, loc)
adamc@91 1615 in
adamc@91 1616 ((L'.EField (e', c', {field = ft, rest = rest}), loc), ft, gs1 @ gs2 @ gs3 @ gs4)
adamc@91 1617 end
adamc@91 1618
adamc@149 1619 | L.ECut (e, c) =>
adamc@149 1620 let
adamc@149 1621 val (e', et, gs1) = elabExp (env, denv) e
adamc@149 1622 val (c', ck, gs2) = elabCon (env, denv) c
adamc@149 1623
adamc@149 1624 val ft = cunif (loc, ktype)
adamc@149 1625 val rest = cunif (loc, ktype_record)
adamc@149 1626 val first = (L'.CRecord (ktype, [(c', ft)]), loc)
adamc@149 1627
adamc@149 1628 val gs3 =
adamc@149 1629 checkCon (env, denv) e' et
adamc@149 1630 (L'.TRecord (L'.CConcat (first, rest), loc), loc)
adamc@149 1631 val gs4 = D.prove env denv (first, rest, loc)
adamc@149 1632 in
adamc@149 1633 ((L'.ECut (e', c', {field = ft, rest = rest}), loc), (L'.TRecord rest, loc), gs1 @ gs2 @ gs3 @ gs4)
adamc@149 1634 end
adamc@149 1635
adamc@91 1636 | L.EFold =>
adamc@91 1637 let
adamc@91 1638 val dom = kunif loc
adamc@91 1639 in
adamc@91 1640 ((L'.EFold dom, loc), foldType (dom, loc), [])
adamc@91 1641 end
adamc@170 1642
adamc@171 1643 | L.ECase (e, pes) =>
adamc@171 1644 let
adamc@171 1645 val (e', et, gs1) = elabExp (env, denv) e
adamc@171 1646 val result = cunif (loc, (L'.KType, loc))
adamc@171 1647 val (pes', gs) = ListUtil.foldlMap
adamc@171 1648 (fn ((p, e), gs) =>
adamc@171 1649 let
adamc@174 1650 val ((p', pt), (env, _)) = elabPat (p, (env, denv, SS.empty))
adamc@171 1651
adamc@171 1652 val gs1 = checkPatCon (env, denv) p' pt et
adamc@171 1653 val (e', et, gs2) = elabExp (env, denv) e
adamc@171 1654 val gs3 = checkCon (env, denv) e' et result
adamc@171 1655 in
adamc@171 1656 ((p', e'), gs1 @ gs2 @ gs3 @ gs)
adamc@171 1657 end)
adamc@171 1658 gs1 pes
adamc@172 1659
adamc@172 1660 val (total, gs') = exhaustive (env, denv, et, map #1 pes')
adamc@171 1661 in
adamc@172 1662 if total then
adamc@172 1663 ()
adamc@172 1664 else
adamc@172 1665 expError env (Inexhaustive loc);
adamc@172 1666
adamc@182 1667 ((L'.ECase (e', pes', {disc = et, result = result}), loc), result, gs' @ gs)
adamc@171 1668 end
adamc@91 1669 end
adamc@12 1670
adamc@12 1671
adamc@6 1672 datatype decl_error =
adamc@91 1673 KunifsRemain of L'.decl list
adamc@91 1674 | CunifsRemain of L'.decl list
adamc@91 1675
adamc@91 1676 fun lspan [] = ErrorMsg.dummySpan
adamc@91 1677 | lspan ((_, loc) :: _) = loc
adamc@6 1678
adamc@6 1679 fun declError env err =
adamc@6 1680 case err of
adamc@91 1681 KunifsRemain ds =>
adamc@91 1682 (ErrorMsg.errorAt (lspan ds) "Some kind unification variables are undetermined in declaration";
adamc@91 1683 eprefaces' [("Decl", p_list_sep PD.newline (p_decl env) ds)])
adamc@91 1684 | CunifsRemain ds =>
adamc@91 1685 (ErrorMsg.errorAt (lspan ds) "Some constructor unification variables are undetermined in declaration";
adamc@91 1686 eprefaces' [("Decl", p_list_sep PD.newline (p_decl env) ds)])
adamc@6 1687
adamc@31 1688 datatype sgn_error =
adamc@31 1689 UnboundSgn of ErrorMsg.span * string
adamc@31 1690 | UnmatchedSgi of L'.sgn_item
adamc@31 1691 | SgiWrongKind of L'.sgn_item * L'.kind * L'.sgn_item * L'.kind * kunify_error
adamc@31 1692 | SgiWrongCon of L'.sgn_item * L'.con * L'.sgn_item * L'.con * cunify_error
adamc@156 1693 | SgiMismatchedDatatypes of L'.sgn_item * L'.sgn_item * (L'.con * L'.con * cunify_error) option
adamc@41 1694 | SgnWrongForm of L'.sgn * L'.sgn
adamc@42 1695 | UnWhereable of L'.sgn * string
adamc@75 1696 | WhereWrongKind of L'.kind * L'.kind * kunify_error
adamc@58 1697 | NotIncludable of L'.sgn
adamc@62 1698 | DuplicateCon of ErrorMsg.span * string
adamc@62 1699 | DuplicateVal of ErrorMsg.span * string
adamc@62 1700 | DuplicateSgn of ErrorMsg.span * string
adamc@62 1701 | DuplicateStr of ErrorMsg.span * string
adamc@88 1702 | NotConstraintsable of L'.sgn
adamc@31 1703
adamc@31 1704 fun sgnError env err =
adamc@31 1705 case err of
adamc@31 1706 UnboundSgn (loc, s) =>
adamc@31 1707 ErrorMsg.errorAt loc ("Unbound signature variable " ^ s)
adamc@31 1708 | UnmatchedSgi (sgi as (_, loc)) =>
adamc@31 1709 (ErrorMsg.errorAt loc "Unmatched signature item";
adamc@31 1710 eprefaces' [("Item", p_sgn_item env sgi)])
adamc@31 1711 | SgiWrongKind (sgi1, k1, sgi2, k2, kerr) =>
adamc@31 1712 (ErrorMsg.errorAt (#2 sgi1) "Kind unification failure in signature matching:";
adamc@59 1713 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59 1714 ("Need", p_sgn_item env sgi2),
adamc@31 1715 ("Kind 1", p_kind k1),
adamc@31 1716 ("Kind 2", p_kind k2)];
adamc@31 1717 kunifyError kerr)
adamc@31 1718 | SgiWrongCon (sgi1, c1, sgi2, c2, cerr) =>
adamc@31 1719 (ErrorMsg.errorAt (#2 sgi1) "Constructor unification failure in signature matching:";
adamc@59 1720 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59 1721 ("Need", p_sgn_item env sgi2),
adamc@31 1722 ("Con 1", p_con env c1),
adamc@31 1723 ("Con 2", p_con env c2)];
adamc@31 1724 cunifyError env cerr)
adamc@156 1725 | SgiMismatchedDatatypes (sgi1, sgi2, cerro) =>
adamc@156 1726 (ErrorMsg.errorAt (#2 sgi1) "Mismatched 'datatype' specifications:";
adamc@156 1727 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@156 1728 ("Need", p_sgn_item env sgi2)];
adamc@156 1729 Option.app (fn (c1, c2, ue) =>
adamc@156 1730 (eprefaces "Unification error"
adamc@156 1731 [("Con 1", p_con env c1),
adamc@156 1732 ("Con 2", p_con env c2)];
adamc@156 1733 cunifyError env ue)) cerro)
adamc@41 1734 | SgnWrongForm (sgn1, sgn2) =>
adamc@41 1735 (ErrorMsg.errorAt (#2 sgn1) "Incompatible signatures:";
adamc@41 1736 eprefaces' [("Sig 1", p_sgn env sgn1),
adamc@41 1737 ("Sig 2", p_sgn env sgn2)])
adamc@42 1738 | UnWhereable (sgn, x) =>
adamc@42 1739 (ErrorMsg.errorAt (#2 sgn) "Unavailable field for 'where'";
adamc@42 1740 eprefaces' [("Signature", p_sgn env sgn),
adamc@42 1741 ("Field", PD.string x)])
adamc@75 1742 | WhereWrongKind (k1, k2, kerr) =>
adamc@75 1743 (ErrorMsg.errorAt (#2 k1) "Wrong kind for 'where'";
adamc@75 1744 eprefaces' [("Have", p_kind k1),
adamc@75 1745 ("Need", p_kind k2)];
adamc@75 1746 kunifyError kerr)
adamc@58 1747 | NotIncludable sgn =>
adamc@58 1748 (ErrorMsg.errorAt (#2 sgn) "Invalid signature to 'include'";
adamc@58 1749 eprefaces' [("Signature", p_sgn env sgn)])
adamc@62 1750 | DuplicateCon (loc, s) =>
adamc@62 1751 ErrorMsg.errorAt loc ("Duplicate constructor " ^ s ^ " in signature")
adamc@62 1752 | DuplicateVal (loc, s) =>
adamc@62 1753 ErrorMsg.errorAt loc ("Duplicate value " ^ s ^ " in signature")
adamc@62 1754 | DuplicateSgn (loc, s) =>
adamc@62 1755 ErrorMsg.errorAt loc ("Duplicate signature " ^ s ^ " in signature")
adamc@62 1756 | DuplicateStr (loc, s) =>
adamc@62 1757 ErrorMsg.errorAt loc ("Duplicate structure " ^ s ^ " in signature")
adamc@88 1758 | NotConstraintsable sgn =>
adamc@88 1759 (ErrorMsg.errorAt (#2 sgn) "Invalid signature for 'open constraints'";
adamc@88 1760 eprefaces' [("Signature", p_sgn env sgn)])
adamc@31 1761
adamc@31 1762 datatype str_error =
adamc@31 1763 UnboundStr of ErrorMsg.span * string
adamc@44 1764 | NotFunctor of L'.sgn
adamc@46 1765 | FunctorRebind of ErrorMsg.span
adamc@61 1766 | UnOpenable of L'.sgn
adamc@75 1767 | NotType of L'.kind * (L'.kind * L'.kind * kunify_error)
adamc@156 1768 | DuplicateConstructor of string * ErrorMsg.span
adamc@158 1769 | NotDatatype of ErrorMsg.span
adamc@31 1770
adamc@31 1771 fun strError env err =
adamc@31 1772 case err of
adamc@31 1773 UnboundStr (loc, s) =>
adamc@31 1774 ErrorMsg.errorAt loc ("Unbound structure variable " ^ s)
adamc@44 1775 | NotFunctor sgn =>
adamc@44 1776 (ErrorMsg.errorAt (#2 sgn) "Application of non-functor";
adamc@44 1777 eprefaces' [("Signature", p_sgn env sgn)])
adamc@46 1778 | FunctorRebind loc =>
adamc@46 1779 ErrorMsg.errorAt loc "Attempt to rebind functor"
adamc@61 1780 | UnOpenable sgn =>
adamc@61 1781 (ErrorMsg.errorAt (#2 sgn) "Un-openable structure";
adamc@61 1782 eprefaces' [("Signature", p_sgn env sgn)])
adamc@75 1783 | NotType (k, (k1, k2, ue)) =>
adamc@75 1784 (ErrorMsg.errorAt (#2 k) "'val' type kind is not 'Type'";
adamc@75 1785 eprefaces' [("Kind", p_kind k),
adamc@75 1786 ("Subkind 1", p_kind k1),
adamc@75 1787 ("Subkind 2", p_kind k2)];
adamc@75 1788 kunifyError ue)
adamc@156 1789 | DuplicateConstructor (x, loc) =>
adamc@156 1790 ErrorMsg.errorAt loc ("Duplicate datatype constructor " ^ x)
adamc@158 1791 | NotDatatype loc =>
adamc@158 1792 ErrorMsg.errorAt loc "Trying to import non-datatype as a datatype"
adamc@31 1793
adamc@42 1794 val hnormSgn = E.hnormSgn
adamc@31 1795
adamc@210 1796 fun tableOf () = (L'.CModProj (!basis_r, [], "sql_table"), ErrorMsg.dummySpan)
adamc@205 1797
adamc@88 1798 fun elabSgn_item ((sgi, loc), (env, denv, gs)) =
adamc@76 1799 case sgi of
adamc@76 1800 L.SgiConAbs (x, k) =>
adamc@76 1801 let
adamc@76 1802 val k' = elabKind k
adamc@31 1803
adamc@76 1804 val (env', n) = E.pushCNamed env x k' NONE
adamc@76 1805 in
adamc@88 1806 ([(L'.SgiConAbs (x, n, k'), loc)], (env', denv, gs))
adamc@76 1807 end
adamc@31 1808
adamc@76 1809 | L.SgiCon (x, ko, c) =>
adamc@76 1810 let
adamc@76 1811 val k' = case ko of
adamc@76 1812 NONE => kunif loc
adamc@76 1813 | SOME k => elabKind k
adamc@31 1814
adamc@83 1815 val (c', ck, gs') = elabCon (env, denv) c
adamc@76 1816 val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@76 1817 in
adamc@76 1818 checkKind env c' ck k';
adamc@31 1819
adamc@88 1820 ([(L'.SgiCon (x, n, k', c'), loc)], (env', denv, gs' @ gs))
adamc@76 1821 end
adamc@31 1822
adamc@191 1823 | L.SgiDatatype (x, xs, xcs) =>
adamc@157 1824 let
adamc@157 1825 val k = (L'.KType, loc)
adamc@191 1826 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 1827 val (env, n) = E.pushCNamed env x k' NONE
adamc@157 1828 val t = (L'.CNamed n, loc)
adamc@194 1829 val nxs = length xs - 1
adamc@194 1830 val t = ListUtil.foldli (fn (i, _, t) => (L'.CApp (t, (L'.CRel (nxs - i), loc)), loc)) t xs
adamc@157 1831
adamc@157 1832 val (xcs, (used, env, gs)) =
adamc@157 1833 ListUtil.foldlMap
adamc@157 1834 (fn ((x, to), (used, env, gs)) =>
adamc@157 1835 let
adamc@157 1836 val (to, t, gs') = case to of
adamc@157 1837 NONE => (NONE, t, gs)
adamc@157 1838 | SOME t' =>
adamc@157 1839 let
adamc@157 1840 val (t', tk, gs') = elabCon (env, denv) t'
adamc@157 1841 in
adamc@157 1842 checkKind env t' tk k;
adamc@157 1843 (SOME t', (L'.TFun (t', t), loc), gs' @ gs)
adamc@157 1844 end
adamc@191 1845 val t = foldl (fn (x, t) => (L'.TCFun (L'.Implicit, x, k, t), loc)) t xs
adamc@157 1846
adamc@157 1847 val (env, n') = E.pushENamed env x t
adamc@157 1848 in
adamc@157 1849 if SS.member (used, x) then
adamc@157 1850 strError env (DuplicateConstructor (x, loc))
adamc@157 1851 else
adamc@157 1852 ();
adamc@157 1853 ((x, n', to), (SS.add (used, x), env, gs'))
adamc@157 1854 end)
adamc@157 1855 (SS.empty, env, []) xcs
adamc@191 1856
adamc@191 1857 val env = E.pushDatatype env n xs xcs
adamc@157 1858 in
adamc@191 1859 ([(L'.SgiDatatype (x, n, xs, xcs), loc)], (env, denv, gs))
adamc@157 1860 end
adamc@156 1861
adamc@158 1862 | L.SgiDatatypeImp (_, [], _) => raise Fail "Empty SgiDatatypeImp"
adamc@158 1863
adamc@158 1864 | L.SgiDatatypeImp (x, m1 :: ms, s) =>
adamc@158 1865 (case E.lookupStr env m1 of
adamc@158 1866 NONE => (strError env (UnboundStr (loc, m1));
adamc@158 1867 ([], (env, denv, gs)))
adamc@158 1868 | SOME (n, sgn) =>
adamc@158 1869 let
adamc@158 1870 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@158 1871 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@158 1872 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@158 1873 (strerror, sgnerror))
adamc@158 1874 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@158 1875 ((L'.StrVar n, loc), sgn) ms
adamc@158 1876 in
adamc@161 1877 case hnormCon (env, denv) (L'.CModProj (n, ms, s), loc) of
adamc@161 1878 ((L'.CModProj (n, ms, s), _), gs) =>
adamc@161 1879 (case E.projectDatatype env {sgn = sgn, str = str, field = s} of
adamc@161 1880 NONE => (conError env (UnboundDatatype (loc, s));
adamc@161 1881 ([], (env, denv, gs)))
adamc@191 1882 | SOME (xs, xncs) =>
adamc@161 1883 let
adamc@161 1884 val k = (L'.KType, loc)
adamc@191 1885 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 1886
adamc@161 1887 val t = (L'.CModProj (n, ms, s), loc)
adamc@191 1888 val (env, n') = E.pushCNamed env x k' (SOME t)
adamc@191 1889 val env = E.pushDatatype env n' xs xncs
adamc@158 1890
adamc@161 1891 val t = (L'.CNamed n', loc)
adamc@161 1892 val env = foldl (fn ((x, n, to), env) =>
adamc@161 1893 let
adamc@161 1894 val t = case to of
adamc@161 1895 NONE => t
adamc@161 1896 | SOME t' => (L'.TFun (t', t), loc)
adamc@191 1897
adamc@191 1898 val t = foldr (fn (x, t) =>
adamc@191 1899 (L'.TCFun (L'.Implicit, x, k, t), loc))
adamc@191 1900 t xs
adamc@161 1901 in
adamc@161 1902 E.pushENamedAs env x n t
adamc@161 1903 end) env xncs
adamc@161 1904 in
adamc@191 1905 ([(L'.SgiDatatypeImp (x, n', n, ms, s, xs, xncs), loc)], (env, denv, gs))
adamc@161 1906 end)
adamc@161 1907 | _ => (strError env (NotDatatype loc);
adamc@161 1908 ([], (env, denv, [])))
adamc@158 1909 end)
adamc@156 1910
adamc@76 1911 | L.SgiVal (x, c) =>
adamc@76 1912 let
adamc@83 1913 val (c', ck, gs') = elabCon (env, denv) c
adamc@31 1914
adamc@76 1915 val (env', n) = E.pushENamed env x c'
adamc@218 1916 val (c', gs'') = normClassConstraint (env, denv) c'
adamc@76 1917 in
adamc@76 1918 (unifyKinds ck ktype
adamc@76 1919 handle KUnify ue => strError env (NotType (ck, ue)));
adamc@31 1920
adamc@218 1921 ([(L'.SgiVal (x, n, c'), loc)], (env', denv, gs' @ gs'' @ gs))
adamc@76 1922 end
adamc@31 1923
adamc@76 1924 | L.SgiStr (x, sgn) =>
adamc@76 1925 let
adamc@83 1926 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 1927 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 1928 in
adamc@88 1929 ([(L'.SgiStr (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 1930 end
adamc@31 1931
adamc@76 1932 | L.SgiSgn (x, sgn) =>
adamc@76 1933 let
adamc@83 1934 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 1935 val (env', n) = E.pushSgnNamed env x sgn'
adamc@76 1936 in
adamc@88 1937 ([(L'.SgiSgn (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 1938 end
adamc@31 1939
adamc@76 1940 | L.SgiInclude sgn =>
adamc@76 1941 let
adamc@83 1942 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 1943 in
adamc@76 1944 case #1 (hnormSgn env sgn') of
adamc@76 1945 L'.SgnConst sgis =>
adamc@88 1946 (sgis, (foldl (fn (sgi, env) => E.sgiBinds env sgi) env sgis, denv, gs' @ gs))
adamc@76 1947 | _ => (sgnError env (NotIncludable sgn');
adamc@88 1948 ([], (env, denv, [])))
adamc@88 1949 end
adamc@88 1950
adamc@88 1951 | L.SgiConstraint (c1, c2) =>
adamc@88 1952 let
adamc@88 1953 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@88 1954 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@88 1955
adamc@90 1956 val (denv, gs3) = D.assert env denv (c1', c2')
adamc@88 1957 in
adamc@88 1958 checkKind env c1' k1 (L'.KRecord (kunif loc), loc);
adamc@88 1959 checkKind env c2' k2 (L'.KRecord (kunif loc), loc);
adamc@88 1960
adamc@90 1961 ([(L'.SgiConstraint (c1', c2'), loc)], (env, denv, gs1 @ gs2 @ gs3))
adamc@76 1962 end
adamc@31 1963
adamc@203 1964 | L.SgiTable (x, c) =>
adamc@203 1965 let
adamc@203 1966 val (c', k, gs) = elabCon (env, denv) c
adamc@210 1967 val (env, n) = E.pushENamed env x (L'.CApp (tableOf (), c'), loc)
adamc@203 1968 in
adamc@203 1969 checkKind env c' k (L'.KRecord (L'.KType, loc), loc);
adamc@210 1970 ([(L'.SgiTable (!basis_r, x, n, c'), loc)], (env, denv, gs))
adamc@203 1971 end
adamc@203 1972
adamc@211 1973 | L.SgiClassAbs x =>
adamc@211 1974 let
adamc@211 1975 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 1976 val (env, n) = E.pushCNamed env x k NONE
adamc@211 1977 val env = E.pushClass env n
adamc@211 1978 in
adamc@211 1979 ([(L'.SgiClassAbs (x, n), loc)], (env, denv, []))
adamc@211 1980 end
adamc@211 1981
adamc@211 1982 | L.SgiClass (x, c) =>
adamc@211 1983 let
adamc@211 1984 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 1985 val (c', ck, gs) = elabCon (env, denv) c
adamc@211 1986 val (env, n) = E.pushCNamed env x k (SOME c')
adamc@211 1987 val env = E.pushClass env n
adamc@211 1988 in
adamc@211 1989 checkKind env c' ck k;
adamc@211 1990 ([(L'.SgiClass (x, n, c'), loc)], (env, denv, []))
adamc@211 1991 end
adamc@211 1992
adamc@83 1993 and elabSgn (env, denv) (sgn, loc) =
adamc@31 1994 case sgn of
adamc@31 1995 L.SgnConst sgis =>
adamc@31 1996 let
adamc@88 1997 val (sgis', (_, _, gs)) = ListUtil.foldlMapConcat elabSgn_item (env, denv, []) sgis
adamc@62 1998
adamc@62 1999 val _ = foldl (fn ((sgi, loc), (cons, vals, sgns, strs)) =>
adamc@62 2000 case sgi of
adamc@62 2001 L'.SgiConAbs (x, _, _) =>
adamc@62 2002 (if SS.member (cons, x) then
adamc@62 2003 sgnError env (DuplicateCon (loc, x))
adamc@62 2004 else
adamc@62 2005 ();
adamc@62 2006 (SS.add (cons, x), vals, sgns, strs))
adamc@62 2007 | L'.SgiCon (x, _, _, _) =>
adamc@62 2008 (if SS.member (cons, x) then
adamc@62 2009 sgnError env (DuplicateCon (loc, x))
adamc@62 2010 else
adamc@62 2011 ();
adamc@62 2012 (SS.add (cons, x), vals, sgns, strs))
adamc@191 2013 | L'.SgiDatatype (x, _, _, xncs) =>
adamc@156 2014 let
adamc@156 2015 val vals = foldl (fn ((x, _, _), vals) =>
adamc@156 2016 (if SS.member (vals, x) then
adamc@156 2017 sgnError env (DuplicateVal (loc, x))
adamc@156 2018 else
adamc@156 2019 ();
adamc@156 2020 SS.add (vals, x)))
adamc@156 2021 vals xncs
adamc@156 2022 in
adamc@156 2023 if SS.member (cons, x) then
adamc@156 2024 sgnError env (DuplicateCon (loc, x))
adamc@156 2025 else
adamc@156 2026 ();
adamc@156 2027 (SS.add (cons, x), vals, sgns, strs)
adamc@156 2028 end
adamc@191 2029 | L'.SgiDatatypeImp (x, _, _, _, _, _, _) =>
adamc@156 2030 (if SS.member (cons, x) then
adamc@156 2031 sgnError env (DuplicateCon (loc, x))
adamc@156 2032 else
adamc@156 2033 ();
adamc@156 2034 (SS.add (cons, x), vals, sgns, strs))
adamc@62 2035 | L'.SgiVal (x, _, _) =>
adamc@62 2036 (if SS.member (vals, x) then
adamc@62 2037 sgnError env (DuplicateVal (loc, x))
adamc@62 2038 else
adamc@62 2039 ();
adamc@62 2040 (cons, SS.add (vals, x), sgns, strs))
adamc@62 2041 | L'.SgiSgn (x, _, _) =>
adamc@62 2042 (if SS.member (sgns, x) then
adamc@62 2043 sgnError env (DuplicateSgn (loc, x))
adamc@62 2044 else
adamc@62 2045 ();
adamc@62 2046 (cons, vals, SS.add (sgns, x), strs))
adamc@62 2047 | L'.SgiStr (x, _, _) =>
adamc@62 2048 (if SS.member (strs, x) then
adamc@62 2049 sgnError env (DuplicateStr (loc, x))
adamc@62 2050 else
adamc@62 2051 ();
adamc@88 2052 (cons, vals, sgns, SS.add (strs, x)))
adamc@203 2053 | L'.SgiConstraint _ => (cons, vals, sgns, strs)
adamc@205 2054 | L'.SgiTable (_, x, _, _) =>
adamc@203 2055 (if SS.member (vals, x) then
adamc@203 2056 sgnError env (DuplicateVal (loc, x))
adamc@203 2057 else
adamc@203 2058 ();
adamc@211 2059 (cons, SS.add (vals, x), sgns, strs))
adamc@211 2060 | L'.SgiClassAbs (x, _) =>
adamc@211 2061 (if SS.member (cons, x) then
adamc@211 2062 sgnError env (DuplicateCon (loc, x))
adamc@211 2063 else
adamc@211 2064 ();
adamc@211 2065 (SS.add (cons, x), vals, sgns, strs))
adamc@211 2066 | L'.SgiClass (x, _, _) =>
adamc@211 2067 (if SS.member (cons, x) then
adamc@211 2068 sgnError env (DuplicateCon (loc, x))
adamc@211 2069 else
adamc@211 2070 ();
adamc@211 2071 (SS.add (cons, x), vals, sgns, strs)))
adamc@62 2072 (SS.empty, SS.empty, SS.empty, SS.empty) sgis'
adamc@31 2073 in
adamc@83 2074 ((L'.SgnConst sgis', loc), gs)
adamc@31 2075 end
adamc@31 2076 | L.SgnVar x =>
adamc@31 2077 (case E.lookupSgn env x of
adamc@31 2078 NONE =>
adamc@31 2079 (sgnError env (UnboundSgn (loc, x));
adamc@83 2080 ((L'.SgnError, loc), []))
adamc@83 2081 | SOME (n, sgis) => ((L'.SgnVar n, loc), []))
adamc@41 2082 | L.SgnFun (m, dom, ran) =>
adamc@41 2083 let
adamc@83 2084 val (dom', gs1) = elabSgn (env, denv) dom
adamc@41 2085 val (env', n) = E.pushStrNamed env m dom'
adamc@83 2086 val (ran', gs2) = elabSgn (env', denv) ran
adamc@41 2087 in
adamc@83 2088 ((L'.SgnFun (m, n, dom', ran'), loc), gs1 @ gs2)
adamc@41 2089 end
adamc@42 2090 | L.SgnWhere (sgn, x, c) =>
adamc@42 2091 let
adamc@83 2092 val (sgn', ds1) = elabSgn (env, denv) sgn
adamc@83 2093 val (c', ck, ds2) = elabCon (env, denv) c
adamc@42 2094 in
adamc@42 2095 case #1 (hnormSgn env sgn') of
adamc@83 2096 L'.SgnError => (sgnerror, [])
adamc@42 2097 | L'.SgnConst sgis =>
adamc@75 2098 if List.exists (fn (L'.SgiConAbs (x', _, k), _) =>
adamc@75 2099 x' = x andalso
adamc@75 2100 (unifyKinds k ck
adamc@75 2101 handle KUnify x => sgnError env (WhereWrongKind x);
adamc@42 2102 true)
adamc@42 2103 | _ => false) sgis then
adamc@83 2104 ((L'.SgnWhere (sgn', x, c'), loc), ds1 @ ds2)
adamc@42 2105 else
adamc@42 2106 (sgnError env (UnWhereable (sgn', x));
adamc@83 2107 (sgnerror, []))
adamc@42 2108 | _ => (sgnError env (UnWhereable (sgn', x));
adamc@83 2109 (sgnerror, []))
adamc@42 2110 end
adamc@59 2111 | L.SgnProj (m, ms, x) =>
adamc@59 2112 (case E.lookupStr env m of
adamc@59 2113 NONE => (strError env (UnboundStr (loc, m));
adamc@83 2114 (sgnerror, []))
adamc@59 2115 | SOME (n, sgn) =>
adamc@59 2116 let
adamc@59 2117 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@59 2118 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@59 2119 NONE => (strError env (UnboundStr (loc, m));
adamc@59 2120 (strerror, sgnerror))
adamc@59 2121 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@59 2122 ((L'.StrVar n, loc), sgn) ms
adamc@59 2123 in
adamc@59 2124 case E.projectSgn env {sgn = sgn, str = str, field = x} of
adamc@59 2125 NONE => (sgnError env (UnboundSgn (loc, x));
adamc@83 2126 (sgnerror, []))
adamc@83 2127 | SOME _ => ((L'.SgnProj (n, ms, x), loc), [])
adamc@59 2128 end)
adamc@59 2129
adamc@31 2130
adamc@66 2131 fun selfify env {str, strs, sgn} =
adamc@66 2132 case #1 (hnormSgn env sgn) of
adamc@66 2133 L'.SgnError => sgn
adamc@66 2134 | L'.SgnVar _ => sgn
adamc@66 2135
adamc@66 2136 | L'.SgnConst sgis =>
adamc@66 2137 (L'.SgnConst (map (fn (L'.SgiConAbs (x, n, k), loc) =>
adamc@66 2138 (L'.SgiCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc)
adamc@191 2139 | (L'.SgiDatatype (x, n, xs, xncs), loc) =>
adamc@191 2140 (L'.SgiDatatypeImp (x, n, str, strs, x, xs, xncs), loc)
adamc@218 2141 | (L'.SgiClassAbs (x, n), loc) =>
adamc@218 2142 (L'.SgiClass (x, n, (L'.CModProj (str, strs, x), loc)), loc)
adamc@66 2143 | (L'.SgiStr (x, n, sgn), loc) =>
adamc@66 2144 (L'.SgiStr (x, n, selfify env {str = str, strs = strs @ [x], sgn = sgn}), loc)
adamc@66 2145 | x => x) sgis), #2 sgn)
adamc@66 2146 | L'.SgnFun _ => sgn
adamc@66 2147 | L'.SgnWhere _ => sgn
adamc@66 2148 | L'.SgnProj (m, ms, x) =>
adamc@66 2149 case E.projectSgn env {str = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66 2150 (L'.StrVar m, #2 sgn) ms,
adamc@66 2151 sgn = #2 (E.lookupStrNamed env m),
adamc@66 2152 field = x} of
adamc@66 2153 NONE => raise Fail "Elaborate.selfify: projectSgn returns NONE"
adamc@66 2154 | SOME sgn => selfify env {str = str, strs = strs, sgn = sgn}
adamc@66 2155
adamc@66 2156 fun selfifyAt env {str, sgn} =
adamc@66 2157 let
adamc@66 2158 fun self (str, _) =
adamc@66 2159 case str of
adamc@66 2160 L'.StrVar x => SOME (x, [])
adamc@66 2161 | L'.StrProj (str, x) =>
adamc@66 2162 (case self str of
adamc@66 2163 NONE => NONE
adamc@66 2164 | SOME (m, ms) => SOME (m, ms @ [x]))
adamc@66 2165 | _ => NONE
adamc@66 2166 in
adamc@66 2167 case self str of
adamc@66 2168 NONE => sgn
adamc@66 2169 | SOME (str, strs) => selfify env {sgn = sgn, str = str, strs = strs}
adamc@66 2170 end
adamc@66 2171
adamc@88 2172 fun dopen (env, denv) {str, strs, sgn} =
adamc@66 2173 let
adamc@66 2174 val m = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66 2175 (L'.StrVar str, #2 sgn) strs
adamc@66 2176 in
adamc@66 2177 case #1 (hnormSgn env sgn) of
adamc@66 2178 L'.SgnConst sgis =>
adamc@88 2179 ListUtil.foldlMap (fn ((sgi, loc), (env', denv')) =>
adamc@162 2180 let
adamc@162 2181 val d =
adamc@162 2182 case sgi of
adamc@162 2183 L'.SgiConAbs (x, n, k) =>
adamc@162 2184 let
adamc@162 2185 val c = (L'.CModProj (str, strs, x), loc)
adamc@162 2186 in
adamc@162 2187 (L'.DCon (x, n, k, c), loc)
adamc@162 2188 end
adamc@162 2189 | L'.SgiCon (x, n, k, c) =>
adamc@162 2190 (L'.DCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc)
adamc@191 2191 | L'.SgiDatatype (x, n, xs, xncs) =>
adamc@191 2192 (L'.DDatatypeImp (x, n, str, strs, x, xs, xncs), loc)
adamc@191 2193 | L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs) =>
adamc@191 2194 (L'.DDatatypeImp (x, n, m1, ms, x', xs, xncs), loc)
adamc@162 2195 | L'.SgiVal (x, n, t) =>
adamc@162 2196 (L'.DVal (x, n, t, (L'.EModProj (str, strs, x), loc)), loc)
adamc@162 2197 | L'.SgiStr (x, n, sgn) =>
adamc@162 2198 (L'.DStr (x, n, sgn, (L'.StrProj (m, x), loc)), loc)
adamc@162 2199 | L'.SgiSgn (x, n, sgn) =>
adamc@162 2200 (L'.DSgn (x, n, (L'.SgnProj (str, strs, x), loc)), loc)
adamc@162 2201 | L'.SgiConstraint (c1, c2) =>
adamc@162 2202 (L'.DConstraint (c1, c2), loc)
adamc@205 2203 | L'.SgiTable (_, x, n, c) =>
adamc@210 2204 (L'.DVal (x, n, (L'.CApp (tableOf (), c), loc),
adamc@203 2205 (L'.EModProj (str, strs, x), loc)), loc)
adamc@211 2206 | L'.SgiClassAbs (x, n) =>
adamc@211 2207 let
adamc@211 2208 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2209 val c = (L'.CModProj (str, strs, x), loc)
adamc@211 2210 in
adamc@211 2211 (L'.DCon (x, n, k, c), loc)
adamc@211 2212 end
adamc@211 2213 | L'.SgiClass (x, n, _) =>
adamc@211 2214 let
adamc@211 2215 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2216 val c = (L'.CModProj (str, strs, x), loc)
adamc@211 2217 in
adamc@211 2218 (L'.DCon (x, n, k, c), loc)
adamc@211 2219 end
adamc@162 2220 in
adamc@162 2221 (d, (E.declBinds env' d, denv'))
adamc@162 2222 end)
adamc@88 2223 (env, denv) sgis
adamc@66 2224 | _ => (strError env (UnOpenable sgn);
adamc@88 2225 ([], (env, denv)))
adamc@66 2226 end
adamc@66 2227
adamc@88 2228 fun dopenConstraints (loc, env, denv) {str, strs} =
adamc@88 2229 case E.lookupStr env str of
adamc@88 2230 NONE => (strError env (UnboundStr (loc, str));
adamc@88 2231 denv)
adamc@88 2232 | SOME (n, sgn) =>
adamc@88 2233 let
adamc@88 2234 val (st, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@88 2235 case E.projectStr env {str = str, sgn = sgn, field = m} of
adamc@88 2236 NONE => (strError env (UnboundStr (loc, m));
adamc@88 2237 (strerror, sgnerror))
adamc@88 2238 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@88 2239 ((L'.StrVar n, loc), sgn) strs
adamc@88 2240
adamc@88 2241 val cso = E.projectConstraints env {sgn = sgn, str = st}
adamc@88 2242
adamc@88 2243 val denv = case cso of
adamc@88 2244 NONE => (strError env (UnboundStr (loc, str));
adamc@88 2245 denv)
adamc@90 2246 | SOME cs => foldl (fn ((c1, c2), denv) =>
adamc@90 2247 let
adamc@90 2248 val (denv, gs) = D.assert env denv (c1, c2)
adamc@90 2249 in
adamc@90 2250 case gs of
adamc@90 2251 [] => ()
adamc@90 2252 | _ => raise Fail "dopenConstraints: Sub-constraints remain";
adamc@90 2253
adamc@90 2254 denv
adamc@90 2255 end) denv cs
adamc@88 2256 in
adamc@88 2257 denv
adamc@88 2258 end
adamc@88 2259
adamc@31 2260 fun sgiOfDecl (d, loc) =
adamc@31 2261 case d of
adamc@123 2262 L'.DCon (x, n, k, c) => [(L'.SgiCon (x, n, k, c), loc)]
adamc@156 2263 | L'.DDatatype x => [(L'.SgiDatatype x, loc)]
adamc@156 2264 | L'.DDatatypeImp x => [(L'.SgiDatatypeImp x, loc)]
adamc@123 2265 | L'.DVal (x, n, t, _) => [(L'.SgiVal (x, n, t), loc)]
adamc@123 2266 | L'.DValRec vis => map (fn (x, n, t, _) => (L'.SgiVal (x, n, t), loc)) vis
adamc@123 2267 | L'.DSgn (x, n, sgn) => [(L'.SgiSgn (x, n, sgn), loc)]
adamc@123 2268 | L'.DStr (x, n, sgn, _) => [(L'.SgiStr (x, n, sgn), loc)]
adamc@123 2269 | L'.DFfiStr (x, n, sgn) => [(L'.SgiStr (x, n, sgn), loc)]
adamc@123 2270 | L'.DConstraint cs => [(L'.SgiConstraint cs, loc)]
adamc@123 2271 | L'.DExport _ => []
adamc@205 2272 | L'.DTable (tn, x, n, c) => [(L'.SgiTable (tn, x, n, c), loc)]
adamc@213 2273 | L'.DClass (x, n, c) => [(L'.SgiClass (x, n, c), loc)]
adamc@88 2274
adamc@88 2275 fun sgiBindsD (env, denv) (sgi, _) =
adamc@88 2276 case sgi of
adamc@90 2277 L'.SgiConstraint (c1, c2) =>
adamc@90 2278 (case D.assert env denv (c1, c2) of
adamc@90 2279 (denv, []) => denv
adamc@90 2280 | _ => raise Fail "sgiBindsD: Sub-constraints remain")
adamc@88 2281 | _ => denv
adamc@31 2282
adamc@86 2283 fun subSgn (env, denv) sgn1 (sgn2 as (_, loc2)) =
adamc@35 2284 case (#1 (hnormSgn env sgn1), #1 (hnormSgn env sgn2)) of
adamc@31 2285 (L'.SgnError, _) => ()
adamc@31 2286 | (_, L'.SgnError) => ()
adamc@31 2287
adamc@31 2288 | (L'.SgnConst sgis1, L'.SgnConst sgis2) =>
adamc@31 2289 let
adamc@156 2290 fun folder (sgi2All as (sgi, loc), (env, denv)) =
adamc@31 2291 let
adamc@31 2292 fun seek p =
adamc@31 2293 let
adamc@88 2294 fun seek (env, denv) ls =
adamc@31 2295 case ls of
adamc@31 2296 [] => (sgnError env (UnmatchedSgi sgi2All);
adamc@88 2297 (env, denv))
adamc@31 2298 | h :: t =>
adamc@31 2299 case p h of
adamc@88 2300 NONE => seek (E.sgiBinds env h, sgiBindsD (env, denv) h) t
adamc@88 2301 | SOME envs => envs
adamc@31 2302 in
adamc@88 2303 seek (env, denv) sgis1
adamc@31 2304 end
adamc@31 2305 in
adamc@31 2306 case sgi of
adamc@31 2307 L'.SgiConAbs (x, n2, k2) =>
adamc@31 2308 seek (fn sgi1All as (sgi1, _) =>
adamc@31 2309 let
adamc@41 2310 fun found (x', n1, k1, co1) =
adamc@41 2311 if x = x' then
adamc@41 2312 let
adamc@41 2313 val () = unifyKinds k1 k2
adamc@41 2314 handle KUnify (k1, k2, err) =>
adamc@41 2315 sgnError env (SgiWrongKind (sgi1All, k1, sgi2All, k2, err))
adamc@41 2316 val env = E.pushCNamedAs env x n1 k1 co1
adamc@41 2317 in
adamc@41 2318 SOME (if n1 = n2 then
adamc@41 2319 env
adamc@41 2320 else
adamc@88 2321 E.pushCNamedAs env x n2 k2 (SOME (L'.CNamed n1, loc2)),
adamc@88 2322 denv)
adamc@41 2323 end
adamc@41 2324 else
adamc@41 2325 NONE
adamc@31 2326 in
adamc@31 2327 case sgi1 of
adamc@41 2328 L'.SgiConAbs (x', n1, k1) => found (x', n1, k1, NONE)
adamc@41 2329 | L'.SgiCon (x', n1, k1, c1) => found (x', n1, k1, SOME c1)
adamc@191 2330 | L'.SgiDatatype (x', n1, xs, _) =>
adamc@191 2331 let
adamc@191 2332 val k = (L'.KType, loc)
adamc@191 2333 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 2334 in
adamc@191 2335 found (x', n1, k', NONE)
adamc@191 2336 end
adamc@191 2337 | L'.SgiDatatypeImp (x', n1, m1, ms, s, xs, _) =>
adamc@191 2338 let
adamc@191 2339 val k = (L'.KType, loc)
adamc@191 2340 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 2341 in
adamc@191 2342 found (x', n1, k', SOME (L'.CModProj (m1, ms, s), loc))
adamc@191 2343 end
adamc@211 2344 | L'.SgiClassAbs (x', n1) => found (x', n1,
adamc@218 2345 (L'.KArrow ((L'.KType, loc),
adamc@218 2346 (L'.KType, loc)), loc),
adamc@218 2347 NONE)
adamc@211 2348 | L'.SgiClass (x', n1, c) => found (x', n1,
adamc@211 2349 (L'.KArrow ((L'.KType, loc),
adamc@211 2350 (L'.KType, loc)), loc),
adamc@211 2351 SOME c)
adamc@31 2352 | _ => NONE
adamc@31 2353 end)
adamc@31 2354
adamc@31 2355 | L'.SgiCon (x, n2, k2, c2) =>
adamc@31 2356 seek (fn sgi1All as (sgi1, _) =>
adamc@211 2357 let
adamc@211 2358 fun found (x', n1, k1, c1) =
adamc@211 2359 if x = x' then
adamc@211 2360 let
adamc@211 2361 fun good () = SOME (E.pushCNamedAs env x n2 k2 (SOME c2), denv)
adamc@211 2362 in
adamc@211 2363 (case unifyCons (env, denv) c1 c2 of
adamc@211 2364 [] => good ()
adamc@211 2365 | _ => NONE)
adamc@211 2366 handle CUnify (c1, c2, err) =>
adamc@211 2367 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@211 2368 good ())
adamc@211 2369 end
adamc@211 2370 else
adamc@211 2371 NONE
adamc@211 2372 in
adamc@211 2373 case sgi1 of
adamc@211 2374 L'.SgiCon (x', n1, k1, c1) => found (x', n1, k1, c1)
adamc@211 2375 | L'.SgiClass (x', n1, c1) =>
adamc@211 2376 found (x', n1, (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc), c1)
adamc@211 2377 | _ => NONE
adamc@211 2378 end)
adamc@31 2379
adamc@191 2380 | L'.SgiDatatype (x, n2, xs2, xncs2) =>
adamc@156 2381 seek (fn sgi1All as (sgi1, _) =>
adamc@160 2382 let
adamc@191 2383 fun found (n1, xs1, xncs1) =
adamc@160 2384 let
adamc@160 2385 fun mismatched ue =
adamc@160 2386 (sgnError env (SgiMismatchedDatatypes (sgi1All, sgi2All, ue));
adamc@160 2387 SOME (env, denv))
adamc@156 2388
adamc@191 2389 val k = (L'.KType, loc)
adamc@191 2390 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs1
adamc@191 2391
adamc@160 2392 fun good () =
adamc@160 2393 let
adamc@160 2394 val env = E.sgiBinds env sgi2All
adamc@160 2395 val env = if n1 = n2 then
adamc@160 2396 env
adamc@160 2397 else
adamc@160 2398 E.pushCNamedAs env x n1 (L'.KType, loc)
adamc@160 2399 (SOME (L'.CNamed n1, loc))
adamc@160 2400 in
adamc@160 2401 SOME (env, denv)
adamc@160 2402 end
adamc@156 2403
adamc@191 2404 val env = foldl (fn (x, env) => E.pushCRel env x k) env xs1
adamc@160 2405 fun xncBad ((x1, _, t1), (x2, _, t2)) =
adamc@160 2406 String.compare (x1, x2) <> EQUAL
adamc@160 2407 orelse case (t1, t2) of
adamc@160 2408 (NONE, NONE) => false
adamc@160 2409 | (SOME t1, SOME t2) =>
adamc@160 2410 not (List.null (unifyCons (env, denv) t1 t2))
adamc@160 2411 | _ => true
adamc@160 2412 in
adamc@191 2413 (if xs1 <> xs2
adamc@191 2414 orelse length xncs1 <> length xncs2
adamc@160 2415 orelse ListPair.exists xncBad (xncs1, xncs2) then
adamc@160 2416 mismatched NONE
adamc@160 2417 else
adamc@160 2418 good ())
adamc@160 2419 handle CUnify ue => mismatched (SOME ue)
adamc@160 2420 end
adamc@160 2421 in
adamc@160 2422 case sgi1 of
adamc@191 2423 L'.SgiDatatype (x', n1, xs, xncs1) =>
adamc@160 2424 if x' = x then
adamc@191 2425 found (n1, xs, xncs1)
adamc@160 2426 else
adamc@160 2427 NONE
adamc@191 2428 | L'.SgiDatatypeImp (x', n1, _, _, _, xs, xncs1) =>
adamc@162 2429 if x' = x then
adamc@191 2430 found (n1, xs, xncs1)
adamc@162 2431 else
adamc@162 2432 NONE
adamc@160 2433 | _ => NONE
adamc@160 2434 end)
adamc@156 2435
adamc@191 2436 | L'.SgiDatatypeImp (x, n2, m12, ms2, s2, xs, _) =>
adamc@158 2437 seek (fn sgi1All as (sgi1, _) =>
adamc@158 2438 case sgi1 of
adamc@191 2439 L'.SgiDatatypeImp (x', n1, m11, ms1, s1, _, _) =>
adamc@158 2440 if x = x' then
adamc@158 2441 let
adamc@158 2442 val k = (L'.KType, loc)
adamc@191 2443 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@158 2444 val t1 = (L'.CModProj (m11, ms1, s1), loc)
adamc@158 2445 val t2 = (L'.CModProj (m12, ms2, s2), loc)
adamc@158 2446
adamc@158 2447 fun good () =
adamc@158 2448 let
adamc@191 2449 val env = E.pushCNamedAs env x n1 k' (SOME t1)
adamc@191 2450 val env = E.pushCNamedAs env x n2 k' (SOME t2)
adamc@158 2451 in
adamc@158 2452 SOME (env, denv)
adamc@158 2453 end
adamc@158 2454 in
adamc@158 2455 (case unifyCons (env, denv) t1 t2 of
adamc@158 2456 [] => good ()
adamc@158 2457 | _ => NONE)
adamc@158 2458 handle CUnify (c1, c2, err) =>
adamc@158 2459 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@158 2460 good ())
adamc@158 2461 end
adamc@158 2462 else
adamc@158 2463 NONE
adamc@158 2464
adamc@158 2465 | _ => NONE)
adamc@156 2466
adamc@32 2467 | L'.SgiVal (x, n2, c2) =>
adamc@32 2468 seek (fn sgi1All as (sgi1, _) =>
adamc@32 2469 case sgi1 of
adamc@41 2470 L'.SgiVal (x', n1, c1) =>
adamc@41 2471 if x = x' then
adamc@86 2472 (case unifyCons (env, denv) c1 c2 of
adamc@88 2473 [] => SOME (env, denv)
adamc@86 2474 | _ => NONE)
adamc@86 2475 handle CUnify (c1, c2, err) =>
adamc@86 2476 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@88 2477 SOME (env, denv))
adamc@41 2478 else
adamc@41 2479 NONE
adamc@205 2480 | L'.SgiTable (_, x', n1, c1) =>
adamc@203 2481 if x = x' then
adamc@210 2482 (case unifyCons (env, denv) (L'.CApp (tableOf (), c1), loc) c2 of
adamc@203 2483 [] => SOME (env, denv)
adamc@203 2484 | _ => NONE)
adamc@203 2485 handle CUnify (c1, c2, err) =>
adamc@203 2486 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@203 2487 SOME (env, denv))
adamc@203 2488 else
adamc@203 2489 NONE
adamc@32 2490 | _ => NONE)
adamc@32 2491
adamc@33 2492 | L'.SgiStr (x, n2, sgn2) =>
adamc@33 2493 seek (fn sgi1All as (sgi1, _) =>
adamc@33 2494 case sgi1 of
adamc@41 2495 L'.SgiStr (x', n1, sgn1) =>
adamc@41 2496 if x = x' then
adamc@66 2497 let
adamc@86 2498 val () = subSgn (env, denv) sgn1 sgn2
adamc@66 2499 val env = E.pushStrNamedAs env x n1 sgn1
adamc@66 2500 val env = if n1 = n2 then
adamc@66 2501 env
adamc@66 2502 else
adamc@66 2503 E.pushStrNamedAs env x n2
adamc@66 2504 (selfifyAt env {str = (L'.StrVar n1, #2 sgn2),
adamc@66 2505 sgn = sgn2})
adamc@66 2506 in
adamc@88 2507 SOME (env, denv)
adamc@66 2508 end
adamc@41 2509 else
adamc@41 2510 NONE
adamc@33 2511 | _ => NONE)
adamc@59 2512
adamc@59 2513 | L'.SgiSgn (x, n2, sgn2) =>
adamc@59 2514 seek (fn sgi1All as (sgi1, _) =>
adamc@59 2515 case sgi1 of
adamc@59 2516 L'.SgiSgn (x', n1, sgn1) =>
adamc@59 2517 if x = x' then
adamc@65 2518 let
adamc@86 2519 val () = subSgn (env, denv) sgn1 sgn2
adamc@86 2520 val () = subSgn (env, denv) sgn2 sgn1
adamc@65 2521
adamc@65 2522 val env = E.pushSgnNamedAs env x n2 sgn2
adamc@65 2523 val env = if n1 = n2 then
adamc@65 2524 env
adamc@65 2525 else
adamc@65 2526 E.pushSgnNamedAs env x n1 sgn2
adamc@65 2527 in
adamc@88 2528 SOME (env, denv)
adamc@65 2529 end
adamc@59 2530 else
adamc@59 2531 NONE
adamc@59 2532 | _ => NONE)
adamc@88 2533
adamc@88 2534 | L'.SgiConstraint (c2, d2) =>
adamc@88 2535 seek (fn sgi1All as (sgi1, _) =>
adamc@88 2536 case sgi1 of
adamc@88 2537 L'.SgiConstraint (c1, d1) =>
adamc@88 2538 if consEq (env, denv) (c1, c2) andalso consEq (env, denv) (d1, d2) then
adamc@90 2539 let
adamc@90 2540 val (denv, gs) = D.assert env denv (c2, d2)
adamc@90 2541 in
adamc@90 2542 case gs of
adamc@90 2543 [] => ()
adamc@90 2544 | _ => raise Fail "subSgn: Sub-constraints remain";
adamc@90 2545
adamc@90 2546 SOME (env, denv)
adamc@90 2547 end
adamc@88 2548 else
adamc@88 2549 NONE
adamc@88 2550 | _ => NONE)
adamc@203 2551
adamc@205 2552 | L'.SgiTable (_, x, n2, c2) =>
adamc@203 2553 seek (fn sgi1All as (sgi1, _) =>
adamc@203 2554 case sgi1 of
adamc@205 2555 L'.SgiTable (_, x', n1, c1) =>
adamc@203 2556 if x = x' then
adamc@203 2557 (case unifyCons (env, denv) c1 c2 of
adamc@203 2558 [] => SOME (env, denv)
adamc@203 2559 | _ => NONE)
adamc@203 2560 handle CUnify (c1, c2, err) =>
adamc@203 2561 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@203 2562 SOME (env, denv))
adamc@203 2563 else
adamc@203 2564 NONE
adamc@203 2565 | _ => NONE)
adamc@211 2566
adamc@211 2567 | L'.SgiClassAbs (x, n2) =>
adamc@211 2568 seek (fn sgi1All as (sgi1, _) =>
adamc@211 2569 let
adamc@211 2570 fun found (x', n1, co) =
adamc@211 2571 if x = x' then
adamc@211 2572 let
adamc@211 2573 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2574 val env = E.pushCNamedAs env x n1 k co
adamc@211 2575 in
adamc@211 2576 SOME (if n1 = n2 then
adamc@211 2577 env
adamc@211 2578 else
adamc@211 2579 E.pushCNamedAs env x n2 k (SOME (L'.CNamed n1, loc2)),
adamc@211 2580 denv)
adamc@211 2581 end
adamc@211 2582 else
adamc@211 2583 NONE
adamc@211 2584 in
adamc@211 2585 case sgi1 of
adamc@211 2586 L'.SgiClassAbs (x', n1) => found (x', n1, NONE)
adamc@211 2587 | L'.SgiClass (x', n1, c) => found (x', n1, SOME c)
adamc@211 2588 | _ => NONE
adamc@211 2589 end)
adamc@211 2590 | L'.SgiClass (x, n2, c2) =>
adamc@211 2591 seek (fn sgi1All as (sgi1, _) =>
adamc@211 2592 let
adamc@211 2593 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2594
adamc@211 2595 fun found (x', n1, c1) =
adamc@211 2596 if x = x' then
adamc@211 2597 let
adamc@218 2598 fun good () =
adamc@218 2599 let
adamc@218 2600 val env = E.pushCNamedAs env x n2 k (SOME c2)
adamc@218 2601 val env = if n1 = n2 then
adamc@218 2602 env
adamc@218 2603 else
adamc@218 2604 E.pushCNamedAs env x n1 k (SOME c1)
adamc@218 2605 in
adamc@218 2606 SOME (env, denv)
adamc@218 2607 end
adamc@211 2608 in
adamc@211 2609 (case unifyCons (env, denv) c1 c2 of
adamc@211 2610 [] => good ()
adamc@211 2611 | _ => NONE)
adamc@211 2612 handle CUnify (c1, c2, err) =>
adamc@211 2613 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@211 2614 good ())
adamc@211 2615 end
adamc@211 2616 else
adamc@211 2617 NONE
adamc@211 2618 in
adamc@211 2619 case sgi1 of
adamc@211 2620 L'.SgiClass (x', n1, c1) => found (x', n1, c1)
adamc@211 2621 | _ => NONE
adamc@211 2622 end)
adamc@31 2623 end
adamc@31 2624 in
adamc@88 2625 ignore (foldl folder (env, denv) sgis2)
adamc@31 2626 end
adamc@31 2627
adamc@41 2628 | (L'.SgnFun (m1, n1, dom1, ran1), L'.SgnFun (m2, n2, dom2, ran2)) =>
adamc@43 2629 let
adamc@43 2630 val ran1 =
adamc@43 2631 if n1 = n2 then
adamc@43 2632 ran1
adamc@43 2633 else
adamc@43 2634 subStrInSgn (n1, n2) ran1
adamc@43 2635 in
adamc@86 2636 subSgn (env, denv) dom2 dom1;
adamc@86 2637 subSgn (E.pushStrNamedAs env m2 n2 dom2, denv) ran1 ran2
adamc@43 2638 end
adamc@41 2639
adamc@41 2640 | _ => sgnError env (SgnWrongForm (sgn1, sgn2))
adamc@41 2641
adamc@61 2642
adamc@88 2643 fun elabDecl ((d, loc), (env, denv, gs)) =
adamc@76 2644 case d of
adamc@76 2645 L.DCon (x, ko, c) =>
adamc@76 2646 let
adamc@76 2647 val k' = case ko of
adamc@76 2648 NONE => kunif loc
adamc@76 2649 | SOME k => elabKind k
adamc@76 2650
adamc@83 2651 val (c', ck, gs') = elabCon (env, denv) c
adamc@76 2652 val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@76 2653 in
adamc@76 2654 checkKind env c' ck k';
adamc@76 2655
adamc@88 2656 ([(L'.DCon (x, n, k', c'), loc)], (env', denv, gs' @ gs))
adamc@76 2657 end
adamc@191 2658 | L.DDatatype (x, xs, xcs) =>
adamc@156 2659 let
adamc@156 2660 val k = (L'.KType, loc)
adamc@191 2661 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 2662 val (env, n) = E.pushCNamed env x k' NONE
adamc@156 2663 val t = (L'.CNamed n, loc)
adamc@194 2664 val nxs = length xs - 1
adamc@194 2665 val t = ListUtil.foldli (fn (i, _, t) => (L'.CApp (t, (L'.CRel (nxs - i), loc)), loc)) t xs
adamc@191 2666
adamc@191 2667 val (env', denv') = foldl (fn (x, (env', denv')) =>
adamc@191 2668 (E.pushCRel env' x k,
adamc@191 2669 D.enter denv')) (env, denv) xs
adamc@156 2670
adamc@156 2671 val (xcs, (used, env, gs)) =
adamc@156 2672 ListUtil.foldlMap
adamc@156 2673 (fn ((x, to), (used, env, gs)) =>
adamc@156 2674 let
adamc@156 2675 val (to, t, gs') = case to of
adamc@156 2676 NONE => (NONE, t, gs)
adamc@156 2677 | SOME t' =>
adamc@156 2678 let
adamc@191 2679 val (t', tk, gs') = elabCon (env', denv') t'
adamc@156 2680 in
adamc@191 2681 checkKind env' t' tk k;
adamc@156 2682 (SOME t', (L'.TFun (t', t), loc), gs' @ gs)
adamc@156 2683 end
adamc@191 2684 val t = foldr (fn (x, t) => (L'.TCFun (L'.Implicit, x, k, t), loc)) t xs
adamc@156 2685
adamc@156 2686 val (env, n') = E.pushENamed env x t
adamc@156 2687 in
adamc@156 2688 if SS.member (used, x) then
adamc@156 2689 strError env (DuplicateConstructor (x, loc))
adamc@156 2690 else
adamc@156 2691 ();
adamc@156 2692 ((x, n', to), (SS.add (used, x), env, gs'))
adamc@156 2693 end)
adamc@156 2694 (SS.empty, env, []) xcs
adamc@171 2695
adamc@191 2696 val env = E.pushDatatype env n xs xcs
adamc@156 2697 in
adamc@191 2698 ([(L'.DDatatype (x, n, xs, xcs), loc)], (env, denv, gs))
adamc@156 2699 end
adamc@156 2700
adamc@157 2701 | L.DDatatypeImp (_, [], _) => raise Fail "Empty DDatatypeImp"
adamc@157 2702
adamc@157 2703 | L.DDatatypeImp (x, m1 :: ms, s) =>
adamc@157 2704 (case E.lookupStr env m1 of
adamc@157 2705 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@157 2706 ([], (env, denv, gs)))
adamc@157 2707 | SOME (n, sgn) =>
adamc@157 2708 let
adamc@157 2709 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@157 2710 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@157 2711 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@157 2712 (strerror, sgnerror))
adamc@157 2713 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@157 2714 ((L'.StrVar n, loc), sgn) ms
adamc@157 2715 in
adamc@158 2716 case hnormCon (env, denv) (L'.CModProj (n, ms, s), loc) of
adamc@158 2717 ((L'.CModProj (n, ms, s), _), gs) =>
adamc@158 2718 (case E.projectDatatype env {sgn = sgn, str = str, field = s} of
adamc@158 2719 NONE => (conError env (UnboundDatatype (loc, s));
adamc@158 2720 ([], (env, denv, gs)))
adamc@191 2721 | SOME (xs, xncs) =>
adamc@158 2722 let
adamc@158 2723 val k = (L'.KType, loc)
adamc@191 2724 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@158 2725 val t = (L'.CModProj (n, ms, s), loc)
adamc@191 2726 val (env, n') = E.pushCNamed env x k' (SOME t)
adamc@191 2727 val env = E.pushDatatype env n' xs xncs
adamc@157 2728
adamc@158 2729 val t = (L'.CNamed n', loc)
adamc@158 2730 val env = foldl (fn ((x, n, to), env) =>
adamc@158 2731 let
adamc@158 2732 val t = case to of
adamc@158 2733 NONE => t
adamc@158 2734 | SOME t' => (L'.TFun (t', t), loc)
adamc@191 2735
adamc@191 2736 val t = foldr (fn (x, t) =>
adamc@191 2737 (L'.TCFun (L'.Implicit, x, k, t), loc))
adamc@191 2738 t xs
adamc@158 2739 in
adamc@158 2740 E.pushENamedAs env x n t
adamc@158 2741 end) env xncs
adamc@158 2742 in
adamc@191 2743 ([(L'.DDatatypeImp (x, n', n, ms, s, xs, xncs), loc)], (env, denv, gs))
adamc@158 2744 end)
adamc@158 2745 | _ => (strError env (NotDatatype loc);
adamc@158 2746 ([], (env, denv, [])))
adamc@157 2747 end)
adamc@157 2748
adamc@76 2749 | L.DVal (x, co, e) =>
adamc@76 2750 let
adamc@123 2751 val (c', _, gs1) = case co of
adamc@83 2752 NONE => (cunif (loc, ktype), ktype, [])
adamc@83 2753 | SOME c => elabCon (env, denv) c
adamc@76 2754
adamc@83 2755 val (e', et, gs2) = elabExp (env, denv) e
adamc@217 2756 val gs3 = checkCon (env, denv) e' et c'
adamc@217 2757 val (c', gs4) = normClassConstraint (env, denv) c'
adamc@76 2758 val (env', n) = E.pushENamed env x c'
adamc@76 2759 in
adamc@217 2760 (*prefaces "DVal" [("x", Print.PD.string x),
adamc@217 2761 ("c'", p_con env c')];*)
adamc@217 2762 ([(L'.DVal (x, n, c', e'), loc)], (env', denv, gs1 @ gs2 @ gs3 @ gs4 @ gs))
adamc@76 2763 end
adamc@123 2764 | L.DValRec vis =>
adamc@123 2765 let
adamc@123 2766 val (vis, gs) = ListUtil.foldlMap
adamc@123 2767 (fn ((x, co, e), gs) =>
adamc@123 2768 let
adamc@123 2769 val (c', _, gs1) = case co of
adamc@123 2770 NONE => (cunif (loc, ktype), ktype, [])
adamc@123 2771 | SOME c => elabCon (env, denv) c
adamc@123 2772 in
adamc@123 2773 ((x, c', e), gs1 @ gs)
adamc@123 2774 end) [] vis
adamc@123 2775
adamc@123 2776 val (vis, env) = ListUtil.foldlMap (fn ((x, c', e), env) =>
adamc@123 2777 let
adamc@123 2778 val (env, n) = E.pushENamed env x c'
adamc@123 2779 in
adamc@123 2780 ((x, n, c', e), env)
adamc@123 2781 end) env vis
adamc@123 2782
adamc@123 2783 val (vis, gs) = ListUtil.foldlMap (fn ((x, n, c', e), gs) =>
adamc@123 2784 let
adamc@123 2785 val (e', et, gs1) = elabExp (env, denv) e
adamc@123 2786
adamc@123 2787 val gs2 = checkCon (env, denv) e' et c'
adamc@123 2788 in
adamc@123 2789 ((x, n, c', e'), gs1 @ gs2 @ gs)
adamc@123 2790 end) gs vis
adamc@123 2791 in
adamc@123 2792 ([(L'.DValRec vis, loc)], (env, denv, gs))
adamc@123 2793 end
adamc@76 2794
adamc@76 2795 | L.DSgn (x, sgn) =>
adamc@76 2796 let
adamc@83 2797 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2798 val (env', n) = E.pushSgnNamed env x sgn'
adamc@76 2799 in
adamc@88 2800 ([(L'.DSgn (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 2801 end
adamc@76 2802
adamc@76 2803 | L.DStr (x, sgno, str) =>
adamc@76 2804 let
adamc@93 2805 val () = if x = "Basis" then
adamc@93 2806 raise Fail "Not allowed to redefine structure 'Basis'"
adamc@93 2807 else
adamc@93 2808 ()
adamc@93 2809
adamc@83 2810 val formal = Option.map (elabSgn (env, denv)) sgno
adamc@76 2811
adamc@83 2812 val (str', sgn', gs') =
adamc@78 2813 case formal of
adamc@78 2814 NONE =>
adamc@78 2815 let
adamc@83 2816 val (str', actual, ds) = elabStr (env, denv) str
adamc@78 2817 in
adamc@83 2818 (str', selfifyAt env {str = str', sgn = actual}, ds)
adamc@78 2819 end
adamc@83 2820 | SOME (formal, gs1) =>
adamc@78 2821 let
adamc@78 2822 val str =
adamc@78 2823 case #1 (hnormSgn env formal) of
adamc@78 2824 L'.SgnConst sgis =>
adamc@78 2825 (case #1 str of
adamc@78 2826 L.StrConst ds =>
adamc@78 2827 let
adamc@78 2828 val needed = foldl (fn ((sgi, _), needed) =>
adamc@78 2829 case sgi of
adamc@78 2830 L'.SgiConAbs (x, _, _) => SS.add (needed, x)
adamc@78 2831 | _ => needed)
adamc@78 2832 SS.empty sgis
adamc@78 2833
adamc@78 2834 val needed = foldl (fn ((d, _), needed) =>
adamc@78 2835 case d of
adamc@78 2836 L.DCon (x, _, _) => (SS.delete (needed, x)
adamc@78 2837 handle NotFound => needed)
adamc@218 2838 | L.DClass (x, _) => (SS.delete (needed, x)
adamc@218 2839 handle NotFound => needed)
adamc@78 2840 | L.DOpen _ => SS.empty
adamc@78 2841 | _ => needed)
adamc@78 2842 needed ds
adamc@78 2843 in
adamc@78 2844 case SS.listItems needed of
adamc@78 2845 [] => str
adamc@78 2846 | xs =>
adamc@78 2847 let
adamc@78 2848 val kwild = (L.KWild, #2 str)
adamc@78 2849 val cwild = (L.CWild kwild, #2 str)
adamc@78 2850 val ds' = map (fn x => (L.DCon (x, NONE, cwild), #2 str)) xs
adamc@78 2851 in
adamc@78 2852 (L.StrConst (ds @ ds'), #2 str)
adamc@78 2853 end
adamc@78 2854 end
adamc@78 2855 | _ => str)
adamc@78 2856 | _ => str
adamc@78 2857
adamc@83 2858 val (str', actual, gs2) = elabStr (env, denv) str
adamc@78 2859 in
adamc@158 2860 subSgn (env, denv) (selfifyAt env {str = str', sgn = actual}) formal;
adamc@83 2861 (str', formal, gs1 @ gs2)
adamc@78 2862 end
adamc@76 2863
adamc@76 2864 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 2865 in
adamc@76 2866 case #1 (hnormSgn env sgn') of
adamc@76 2867 L'.SgnFun _ =>
adamc@76 2868 (case #1 str' of
adamc@76 2869 L'.StrFun _ => ()
adamc@76 2870 | _ => strError env (FunctorRebind loc))
adamc@76 2871 | _ => ();
adamc@76 2872
adamc@88 2873 ([(L'.DStr (x, n, sgn', str'), loc)], (env', denv, gs' @ gs))
adamc@76 2874 end
adamc@76 2875
adamc@76 2876 | L.DFfiStr (x, sgn) =>
adamc@76 2877 let
adamc@83 2878 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2879
adamc@76 2880 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 2881 in
adamc@88 2882 ([(L'.DFfiStr (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 2883 end
adamc@76 2884
adamc@76 2885 | L.DOpen (m, ms) =>
adamc@88 2886 (case E.lookupStr env m of
adamc@88 2887 NONE => (strError env (UnboundStr (loc, m));
adamc@205 2888 ([], (env, denv, gs)))
adamc@88 2889 | SOME (n, sgn) =>
adamc@88 2890 let
adamc@88 2891 val (_, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@88 2892 case E.projectStr env {str = str, sgn = sgn, field = m} of
adamc@88 2893 NONE => (strError env (UnboundStr (loc, m));
adamc@88 2894 (strerror, sgnerror))
adamc@88 2895 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@88 2896 ((L'.StrVar n, loc), sgn) ms
adamc@83 2897
adamc@88 2898 val (ds, (env', denv')) = dopen (env, denv) {str = n, strs = ms, sgn = sgn}
adamc@88 2899 val denv' = dopenConstraints (loc, env', denv') {str = m, strs = ms}
adamc@88 2900 in
adamc@205 2901 (ds, (env', denv', gs))
adamc@88 2902 end)
adamc@88 2903
adamc@88 2904 | L.DConstraint (c1, c2) =>
adamc@88 2905 let
adamc@88 2906 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@88 2907 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@90 2908 val gs3 = D.prove env denv (c1', c2', loc)
adamc@88 2909
adamc@90 2910 val (denv', gs4) = D.assert env denv (c1', c2')
adamc@88 2911 in
adamc@88 2912 checkKind env c1' k1 (L'.KRecord (kunif loc), loc);
adamc@88 2913 checkKind env c2' k2 (L'.KRecord (kunif loc), loc);
adamc@88 2914
adamc@205 2915 ([(L'.DConstraint (c1', c2'), loc)], (env, denv', gs1 @ gs2 @ gs3 @ gs4 @ gs))
adamc@88 2916 end
adamc@88 2917
adamc@88 2918 | L.DOpenConstraints (m, ms) =>
adamc@88 2919 let
adamc@88 2920 val denv = dopenConstraints (loc, env, denv) {str = m, strs = ms}
adamc@88 2921 in
adamc@205 2922 ([], (env, denv, gs))
adamc@88 2923 end
adamc@3 2924
adamc@109 2925 | L.DExport str =>
adamc@100 2926 let
adamc@205 2927 val (str', sgn, gs') = elabStr (env, denv) str
adamc@100 2928
adamc@109 2929 val sgn =
adamc@109 2930 case #1 (hnormSgn env sgn) of
adamc@109 2931 L'.SgnConst sgis =>
adamc@109 2932 let
adamc@146 2933 fun doOne (all as (sgi, _), env) =
adamc@146 2934 (case sgi of
adamc@146 2935 L'.SgiVal (x, n, t) =>
adamc@146 2936 (case hnormCon (env, denv) t of
adamc@146 2937 ((L'.TFun (dom, ran), _), []) =>
adamc@146 2938 (case (hnormCon (env, denv) dom, hnormCon (env, denv) ran) of
adamc@146 2939 (((L'.TRecord domR, _), []),
adamc@146 2940 ((L'.CApp (tf, arg3), _), [])) =>
adamc@146 2941 (case (hnormCon (env, denv) tf, hnormCon (env, denv) arg3) of
adamc@146 2942 (((L'.CApp (tf, arg2), _), []),
adamc@146 2943 (((L'.CRecord (_, []), _), []))) =>
adamc@146 2944 (case (hnormCon (env, denv) tf) of
adamc@146 2945 ((L'.CApp (tf, arg1), _), []) =>
adamc@146 2946 (case (hnormCon (env, denv) tf,
adamc@146 2947 hnormCon (env, denv) domR,
adamc@152 2948 hnormCon (env, denv) arg1,
adamc@146 2949 hnormCon (env, denv) arg2) of
adamc@152 2950 ((tf, []), (domR, []), (arg1, []),
adamc@146 2951 ((L'.CRecord (_, []), _), [])) =>
adamc@146 2952 let
adamc@146 2953 val t = (L'.CApp (tf, arg1), loc)
adamc@146 2954 val t = (L'.CApp (t, arg2), loc)
adamc@146 2955 val t = (L'.CApp (t, arg3), loc)
adamc@146 2956 in
adamc@146 2957 (L'.SgiVal (x, n, (L'.TFun ((L'.TRecord domR, loc),
adamc@146 2958 t),
adamc@146 2959 loc)), loc)
adamc@146 2960 end
adamc@146 2961 | _ => all)
adamc@146 2962 | _ => all)
adamc@146 2963 | _ => all)
adamc@146 2964 | _ => all)
adamc@146 2965 | _ => all)
adamc@146 2966 | _ => all,
adamc@146 2967 E.sgiBinds env all)
adamc@109 2968 in
adamc@146 2969 (L'.SgnConst (#1 (ListUtil.foldlMap doOne env sgis)), loc)
adamc@109 2970 end
adamc@109 2971 | _ => sgn
adamc@100 2972 in
adamc@205 2973 ([(L'.DExport (E.newNamed (), sgn, str'), loc)], (env, denv, gs' @ gs))
adamc@100 2974 end
adamc@100 2975
adamc@203 2976 | L.DTable (x, c) =>
adamc@203 2977 let
adamc@205 2978 val (c', k, gs') = elabCon (env, denv) c
adamc@210 2979 val (env, n) = E.pushENamed env x (L'.CApp (tableOf (), c'), loc)
adamc@203 2980 in
adamc@203 2981 checkKind env c' k (L'.KRecord (L'.KType, loc), loc);
adamc@210 2982 ([(L'.DTable (!basis_r, x, n, c'), loc)], (env, denv, gs' @ gs))
adamc@203 2983 end
adamc@203 2984
adamc@211 2985 | L.DClass (x, c) =>
adamc@211 2986 let
adamc@211 2987 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 2988 val (c', ck, gs) = elabCon (env, denv) c
adamc@211 2989 val (env, n) = E.pushCNamed env x k (SOME c')
adamc@211 2990 val env = E.pushClass env n
adamc@211 2991 in
adamc@211 2992 checkKind env c' ck k;
adamc@213 2993 ([(L'.DClass (x, n, c'), loc)], (env, denv, []))
adamc@211 2994 end
adamc@211 2995
adamc@83 2996 and elabStr (env, denv) (str, loc) =
adamc@31 2997 case str of
adamc@31 2998 L.StrConst ds =>
adamc@31 2999 let
adamc@88 3000 val (ds', (_, _, gs)) = ListUtil.foldlMapConcat elabDecl (env, denv, []) ds
adamc@123 3001 val sgis = ListUtil.mapConcat sgiOfDecl ds'
adamc@63 3002
adamc@63 3003 val (sgis, _, _, _, _) =
adamc@64 3004 foldr (fn ((sgi, loc), (sgis, cons, vals, sgns, strs)) =>
adamc@63 3005 case sgi of
adamc@64 3006 L'.SgiConAbs (x, n, k) =>
adamc@64 3007 let
adamc@64 3008 val (cons, x) =
adamc@64 3009 if SS.member (cons, x) then
adamc@64 3010 (cons, "?" ^ x)
adamc@64 3011 else
adamc@64 3012 (SS.add (cons, x), x)
adamc@64 3013 in
adamc@64 3014 ((L'.SgiConAbs (x, n, k), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 3015 end
adamc@64 3016 | L'.SgiCon (x, n, k, c) =>
adamc@64 3017 let
adamc@64 3018 val (cons, x) =
adamc@64 3019 if SS.member (cons, x) then
adamc@64 3020 (cons, "?" ^ x)
adamc@64 3021 else
adamc@64 3022 (SS.add (cons, x), x)
adamc@64 3023 in
adamc@64 3024 ((L'.SgiCon (x, n, k, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 3025 end
adamc@191 3026 | L'.SgiDatatype (x, n, xs, xncs) =>
adamc@156 3027 let
adamc@156 3028 val (cons, x) =
adamc@156 3029 if SS.member (cons, x) then
adamc@156 3030 (cons, "?" ^ x)
adamc@156 3031 else
adamc@156 3032 (SS.add (cons, x), x)
adamc@156 3033
adamc@156 3034 val (xncs, vals) =
adamc@156 3035 ListUtil.foldlMap
adamc@156 3036 (fn ((x, n, t), vals) =>
adamc@156 3037 if SS.member (vals, x) then
adamc@156 3038 (("?" ^ x, n, t), vals)
adamc@156 3039 else
adamc@156 3040 ((x, n, t), SS.add (vals, x)))
adamc@156 3041 vals xncs
adamc@156 3042 in
adamc@191 3043 ((L'.SgiDatatype (x, n, xs, xncs), loc) :: sgis, cons, vals, sgns, strs)
adamc@156 3044 end
adamc@191 3045 | L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs) =>
adamc@156 3046 let
adamc@156 3047 val (cons, x) =
adamc@156 3048 if SS.member (cons, x) then
adamc@156 3049 (cons, "?" ^ x)
adamc@156 3050 else
adamc@156 3051 (SS.add (cons, x), x)
adamc@156 3052 in
adamc@191 3053 ((L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs), loc) :: sgis, cons, vals, sgns, strs)
adamc@156 3054 end
adamc@64 3055 | L'.SgiVal (x, n, c) =>
adamc@64 3056 let
adamc@64 3057 val (vals, x) =
adamc@64 3058 if SS.member (vals, x) then
adamc@64 3059 (vals, "?" ^ x)
adamc@64 3060 else
adamc@64 3061 (SS.add (vals, x), x)
adamc@64 3062 in
adamc@64 3063 ((L'.SgiVal (x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 3064 end
adamc@64 3065 | L'.SgiSgn (x, n, sgn) =>
adamc@64 3066 let
adamc@64 3067 val (sgns, x) =
adamc@64 3068 if SS.member (sgns, x) then
adamc@64 3069 (sgns, "?" ^ x)
adamc@64 3070 else
adamc@64 3071 (SS.add (sgns, x), x)
adamc@64 3072 in
adamc@64 3073 ((L'.SgiSgn (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 3074 end
adamc@64 3075
adamc@64 3076 | L'.SgiStr (x, n, sgn) =>
adamc@64 3077 let
adamc@64 3078 val (strs, x) =
adamc@64 3079 if SS.member (strs, x) then
adamc@64 3080 (strs, "?" ^ x)
adamc@64 3081 else
adamc@64 3082 (SS.add (strs, x), x)
adamc@64 3083 in
adamc@64 3084 ((L'.SgiStr (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@88 3085 end
adamc@203 3086 | L'.SgiConstraint _ => ((sgi, loc) :: sgis, cons, vals, sgns, strs)
adamc@205 3087 | L'.SgiTable (tn, x, n, c) =>
adamc@203 3088 let
adamc@203 3089 val (vals, x) =
adamc@203 3090 if SS.member (vals, x) then
adamc@203 3091 (vals, "?" ^ x)
adamc@203 3092 else
adamc@203 3093 (SS.add (vals, x), x)
adamc@203 3094 in
adamc@205 3095 ((L'.SgiTable (tn, x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@211 3096 end
adamc@211 3097 | L'.SgiClassAbs (x, n) =>
adamc@211 3098 let
adamc@211 3099 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 3100
adamc@211 3101 val (cons, x) =
adamc@211 3102 if SS.member (cons, x) then
adamc@211 3103 (cons, "?" ^ x)
adamc@211 3104 else
adamc@211 3105 (SS.add (cons, x), x)
adamc@211 3106 in
adamc@211 3107 ((L'.SgiClassAbs (x, n), loc) :: sgis, cons, vals, sgns, strs)
adamc@211 3108 end
adamc@211 3109 | L'.SgiClass (x, n, c) =>
adamc@211 3110 let
adamc@211 3111 val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211 3112
adamc@211 3113 val (cons, x) =
adamc@211 3114 if SS.member (cons, x) then
adamc@211 3115 (cons, "?" ^ x)
adamc@211 3116 else
adamc@211 3117 (SS.add (cons, x), x)
adamc@211 3118 in
adamc@211 3119 ((L'.SgiClass (x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@203 3120 end)
adamc@64 3121
adamc@63 3122 ([], SS.empty, SS.empty, SS.empty, SS.empty) sgis
adamc@31 3123 in
adamc@83 3124 ((L'.StrConst ds', loc), (L'.SgnConst sgis, loc), gs)
adamc@31 3125 end
adamc@31 3126 | L.StrVar x =>
adamc@31 3127 (case E.lookupStr env x of
adamc@31 3128 NONE =>
adamc@31 3129 (strError env (UnboundStr (loc, x));
adamc@83 3130 (strerror, sgnerror, []))
adamc@83 3131 | SOME (n, sgn) => ((L'.StrVar n, loc), sgn, []))
adamc@34 3132 | L.StrProj (str, x) =>
adamc@34 3133 let
adamc@83 3134 val (str', sgn, gs) = elabStr (env, denv) str
adamc@34 3135 in
adamc@34 3136 case E.projectStr env {str = str', sgn = sgn, field = x} of
adamc@34 3137 NONE => (strError env (UnboundStr (loc, x));
adamc@83 3138 (strerror, sgnerror, []))
adamc@83 3139 | SOME sgn => ((L'.StrProj (str', x), loc), sgn, gs)
adamc@34 3140 end
adamc@41 3141 | L.StrFun (m, dom, ranO, str) =>
adamc@41 3142 let
adamc@83 3143 val (dom', gs1) = elabSgn (env, denv) dom
adamc@41 3144 val (env', n) = E.pushStrNamed env m dom'
adamc@83 3145 val (str', actual, gs2) = elabStr (env', denv) str
adamc@41 3146
adamc@83 3147 val (formal, gs3) =
adamc@41 3148 case ranO of
adamc@83 3149 NONE => (actual, [])
adamc@41 3150 | SOME ran =>
adamc@41 3151 let
adamc@83 3152 val (ran', gs) = elabSgn (env', denv) ran
adamc@41 3153 in
adamc@86 3154 subSgn (env', denv) actual ran';
adamc@83 3155 (ran', gs)
adamc@41 3156 end
adamc@41 3157 in
adamc@41 3158 ((L'.StrFun (m, n, dom', formal, str'), loc),
adamc@83 3159 (L'.SgnFun (m, n, dom', formal), loc),
adamc@83 3160 gs1 @ gs2 @ gs3)
adamc@41 3161 end
adamc@44 3162 | L.StrApp (str1, str2) =>
adamc@44 3163 let
adamc@83 3164 val (str1', sgn1, gs1) = elabStr (env, denv) str1
adamc@83 3165 val (str2', sgn2, gs2) = elabStr (env, denv) str2
adamc@44 3166 in
adamc@44 3167 case #1 (hnormSgn env sgn1) of
adamc@83 3168 L'.SgnError => (strerror, sgnerror, [])
adamc@44 3169 | L'.SgnFun (m, n, dom, ran) =>
adamc@86 3170 (subSgn (env, denv) sgn2 dom;
adamc@44 3171 case #1 (hnormSgn env ran) of
adamc@83 3172 L'.SgnError => (strerror, sgnerror, [])
adamc@44 3173 | L'.SgnConst sgis =>
adamc@44 3174 ((L'.StrApp (str1', str2'), loc),
adamc@83 3175 (L'.SgnConst ((L'.SgiStr (m, n, selfifyAt env {str = str2', sgn = sgn2}), loc) :: sgis), loc),
adamc@83 3176 gs1 @ gs2)
adamc@44 3177 | _ => raise Fail "Unable to hnormSgn in functor application")
adamc@44 3178 | _ => (strError env (NotFunctor sgn1);
adamc@83 3179 (strerror, sgnerror, []))
adamc@44 3180 end
adamc@31 3181
adamc@56 3182 fun elabFile basis env file =
adamc@56 3183 let
adamc@83 3184 val (sgn, gs) = elabSgn (env, D.empty) (L.SgnConst basis, ErrorMsg.dummySpan)
adamc@83 3185 val () = case gs of
adamc@83 3186 [] => ()
adamc@207 3187 | _ => (app (fn (_, env, _, c1, c2) =>
adamc@207 3188 prefaces "Unresolved"
adamc@207 3189 [("c1", p_con env c1),
adamc@207 3190 ("c2", p_con env c2)]) gs;
adamc@207 3191 raise Fail "Unresolved disjointness constraints in Basis")
adamc@83 3192
adamc@56 3193 val (env', basis_n) = E.pushStrNamed env "Basis" sgn
adamc@210 3194 val () = basis_r := basis_n
adamc@56 3195
adamc@88 3196 val (ds, (env', _)) = dopen (env', D.empty) {str = basis_n, strs = [], sgn = sgn}
adamc@56 3197
adamc@56 3198 fun discoverC r x =
adamc@56 3199 case E.lookupC env' x of
adamc@56 3200 E.NotBound => raise Fail ("Constructor " ^ x ^ " unbound in Basis")
adamc@56 3201 | E.Rel _ => raise Fail ("Constructor " ^ x ^ " bound relatively in Basis")
adamc@56 3202 | E.Named (n, (_, loc)) => r := (L'.CNamed n, loc)
adamc@56 3203
adamc@56 3204 val () = discoverC int "int"
adamc@56 3205 val () = discoverC float "float"
adamc@56 3206 val () = discoverC string "string"
adamc@203 3207 val () = discoverC table "sql_table"
adamc@56 3208
adamc@83 3209 fun elabDecl' (d, (env, gs)) =
adamc@76 3210 let
adamc@76 3211 val () = resetKunif ()
adamc@76 3212 val () = resetCunif ()
adamc@88 3213 val (ds, (env, _, gs)) = elabDecl (d, (env, D.empty, gs))
adamc@76 3214 in
adamc@76 3215 if ErrorMsg.anyErrors () then
adamc@76 3216 ()
adamc@76 3217 else (
adamc@76 3218 if List.exists kunifsInDecl ds then
adamc@91 3219 declError env (KunifsRemain ds)
adamc@76 3220 else
adamc@76 3221 ();
adamc@76 3222
adamc@76 3223 case ListUtil.search cunifsInDecl ds of
adamc@76 3224 NONE => ()
adamc@76 3225 | SOME loc =>
adamc@91 3226 declError env (CunifsRemain ds)
adamc@76 3227 );
adamc@76 3228
adamc@83 3229 (ds, (env, gs))
adamc@76 3230 end
adamc@76 3231
adamc@83 3232 val (file, (_, gs)) = ListUtil.foldlMapConcat elabDecl' (env', []) file
adamc@56 3233 in
adamc@84 3234 if ErrorMsg.anyErrors () then
adamc@84 3235 ()
adamc@84 3236 else
adamc@90 3237 app (fn (loc, env, denv, c1, c2) =>
adamc@84 3238 case D.prove env denv (c1, c2, loc) of
adamc@84 3239 [] => ()
adamc@84 3240 | _ =>
adamc@86 3241 (ErrorMsg.errorAt loc "Couldn't prove field name disjointness";
adamc@84 3242 eprefaces' [("Con 1", p_con env c1),
adamc@90 3243 ("Con 2", p_con env c2),
adamc@90 3244 ("Hnormed 1", p_con env (ElabOps.hnormCon env c1)),
adamc@90 3245 ("Hnormed 2", p_con env (ElabOps.hnormCon env c2))])) gs;
adamc@83 3246
adamc@56 3247 (L'.DFfiStr ("Basis", basis_n, sgn), ErrorMsg.dummySpan) :: ds @ file
adamc@56 3248 end
adamc@2 3249
adamc@2 3250 end