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annotate src/elaborate.sml @ 71:6431b315a1e3

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Elaborate efold
author Adam Chlipala <adamc@hcoop.net>
date Thu, 26 Jun 2008 11:09:30 -0400
parents 9f89f0b00b84
children 144d082b47ae
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@2 35
adamc@3 36 open Print
adamc@3 37 open ElabPrint
adamc@3 38
adamc@62 39 structure SS = BinarySetFn(struct
adamc@62 40 type ord_key = string
adamc@62 41 val compare = String.compare
adamc@62 42 end)
adamc@62 43
adamc@2 44 fun elabExplicitness e =
adamc@2 45 case e of
adamc@2 46 L.Explicit => L'.Explicit
adamc@2 47 | L.Implicit => L'.Implicit
adamc@2 48
adamc@2 49 fun occursKind r =
adamc@2 50 U.Kind.exists (fn L'.KUnif (_, r') => r = r'
adamc@2 51 | _ => false)
adamc@2 52
adamc@3 53 datatype kunify_error =
adamc@2 54 KOccursCheckFailed of L'.kind * L'.kind
adamc@2 55 | KIncompatible of L'.kind * L'.kind
adamc@2 56
adamc@3 57 exception KUnify' of kunify_error
adamc@3 58
adamc@3 59 fun kunifyError err =
adamc@2 60 case err of
adamc@2 61 KOccursCheckFailed (k1, k2) =>
adamc@3 62 eprefaces "Kind occurs check failed"
adamc@3 63 [("Kind 1", p_kind k1),
adamc@3 64 ("Kind 2", p_kind k2)]
adamc@2 65 | KIncompatible (k1, k2) =>
adamc@3 66 eprefaces "Incompatible kinds"
adamc@3 67 [("Kind 1", p_kind k1),
adamc@3 68 ("Kind 2", p_kind k2)]
adamc@2 69
adamc@3 70 fun unifyKinds' (k1All as (k1, _)) (k2All as (k2, _)) =
adamc@2 71 let
adamc@3 72 fun err f = raise KUnify' (f (k1All, k2All))
adamc@2 73 in
adamc@2 74 case (k1, k2) of
adamc@2 75 (L'.KType, L'.KType) => ()
adamc@2 76 | (L'.KArrow (d1, r1), L'.KArrow (d2, r2)) =>
adamc@3 77 (unifyKinds' d1 d2;
adamc@3 78 unifyKinds' r1 r2)
adamc@2 79 | (L'.KName, L'.KName) => ()
adamc@3 80 | (L'.KRecord k1, L'.KRecord k2) => unifyKinds' k1 k2
adamc@2 81
adamc@2 82 | (L'.KError, _) => ()
adamc@2 83 | (_, L'.KError) => ()
adamc@2 84
adamc@3 85 | (L'.KUnif (_, ref (SOME k1All)), _) => unifyKinds' k1All k2All
adamc@3 86 | (_, L'.KUnif (_, ref (SOME k2All))) => unifyKinds' k1All k2All
adamc@2 87
adamc@2 88 | (L'.KUnif (_, r1), L'.KUnif (_, r2)) =>
adamc@2 89 if r1 = r2 then
adamc@2 90 ()
adamc@2 91 else
adamc@2 92 r1 := SOME k2All
adamc@2 93
adamc@2 94 | (L'.KUnif (_, r), _) =>
adamc@2 95 if occursKind r k2All then
adamc@2 96 err KOccursCheckFailed
adamc@2 97 else
adamc@2 98 r := SOME k2All
adamc@2 99 | (_, L'.KUnif (_, r)) =>
adamc@2 100 if occursKind r k1All then
adamc@2 101 err KOccursCheckFailed
adamc@2 102 else
adamc@2 103 r := SOME k1All
adamc@2 104
adamc@2 105 | _ => err KIncompatible
adamc@2 106 end
adamc@2 107
adamc@3 108 exception KUnify of L'.kind * L'.kind * kunify_error
adamc@3 109
adamc@3 110 fun unifyKinds k1 k2 =
adamc@3 111 unifyKinds' k1 k2
adamc@3 112 handle KUnify' err => raise KUnify (k1, k2, err)
adamc@3 113
adamc@3 114 datatype con_error =
adamc@3 115 UnboundCon of ErrorMsg.span * string
adamc@34 116 | UnboundStrInCon of ErrorMsg.span * string
adamc@3 117 | WrongKind of L'.con * L'.kind * L'.kind * kunify_error
adamc@67 118 | DuplicateField of ErrorMsg.span * string
adamc@3 119
adamc@5 120 fun conError env err =
adamc@3 121 case err of
adamc@3 122 UnboundCon (loc, s) =>
adamc@3 123 ErrorMsg.errorAt loc ("Unbound constructor variable " ^ s)
adamc@34 124 | UnboundStrInCon (loc, s) =>
adamc@34 125 ErrorMsg.errorAt loc ("Unbound structure " ^ s)
adamc@3 126 | WrongKind (c, k1, k2, kerr) =>
adamc@3 127 (ErrorMsg.errorAt (#2 c) "Wrong kind";
adamc@5 128 eprefaces' [("Constructor", p_con env c),
adamc@5 129 ("Have kind", p_kind k1),
adamc@5 130 ("Need kind", p_kind k2)];
adamc@3 131 kunifyError kerr)
adamc@67 132 | DuplicateField (loc, s) =>
adamc@67 133 ErrorMsg.errorAt loc ("Duplicate record field " ^ s)
adamc@3 134
adamc@5 135 fun checkKind env c k1 k2 =
adamc@3 136 unifyKinds k1 k2
adamc@3 137 handle KUnify (k1, k2, err) =>
adamc@5 138 conError env (WrongKind (c, k1, k2, err))
adamc@3 139
adamc@3 140 val dummy = ErrorMsg.dummySpan
adamc@3 141
adamc@3 142 val ktype = (L'.KType, dummy)
adamc@3 143 val kname = (L'.KName, dummy)
adamc@12 144 val ktype_record = (L'.KRecord ktype, dummy)
adamc@3 145
adamc@3 146 val cerror = (L'.CError, dummy)
adamc@3 147 val kerror = (L'.KError, dummy)
adamc@10 148 val eerror = (L'.EError, dummy)
adamc@31 149 val sgnerror = (L'.SgnError, dummy)
adamc@31 150 val strerror = (L'.StrError, dummy)
adamc@3 151
adamc@56 152 val int = ref cerror
adamc@56 153 val float = ref cerror
adamc@56 154 val string = ref cerror
adamc@56 155
adamc@3 156 local
adamc@3 157 val count = ref 0
adamc@3 158 in
adamc@3 159
adamc@3 160 fun resetKunif () = count := 0
adamc@3 161
adamc@3 162 fun kunif () =
adamc@3 163 let
adamc@3 164 val n = !count
adamc@3 165 val s = if n <= 26 then
adamc@3 166 str (chr (ord #"A" + n))
adamc@3 167 else
adamc@3 168 "U" ^ Int.toString (n - 26)
adamc@3 169 in
adamc@3 170 count := n + 1;
adamc@3 171 (L'.KUnif (s, ref NONE), dummy)
adamc@3 172 end
adamc@3 173
adamc@3 174 end
adamc@3 175
adamc@10 176 local
adamc@10 177 val count = ref 0
adamc@10 178 in
adamc@10 179
adamc@10 180 fun resetCunif () = count := 0
adamc@10 181
adamc@10 182 fun cunif k =
adamc@10 183 let
adamc@10 184 val n = !count
adamc@10 185 val s = if n <= 26 then
adamc@10 186 str (chr (ord #"A" + n))
adamc@10 187 else
adamc@10 188 "U" ^ Int.toString (n - 26)
adamc@10 189 in
adamc@10 190 count := n + 1;
adamc@10 191 (L'.CUnif (k, s, ref NONE), dummy)
adamc@10 192 end
adamc@10 193
adamc@10 194 end
adamc@10 195
adamc@18 196 fun elabKind (k, loc) =
adamc@18 197 case k of
adamc@18 198 L.KType => (L'.KType, loc)
adamc@18 199 | L.KArrow (k1, k2) => (L'.KArrow (elabKind k1, elabKind k2), loc)
adamc@18 200 | L.KName => (L'.KName, loc)
adamc@18 201 | L.KRecord k => (L'.KRecord (elabKind k), loc)
adamc@18 202 | L.KWild => kunif ()
adamc@18 203
adamc@67 204 fun foldKind (dom, ran, loc)=
adamc@67 205 (L'.KArrow ((L'.KArrow ((L'.KName, loc),
adamc@67 206 (L'.KArrow (dom,
adamc@67 207 (L'.KArrow (ran, ran), loc)), loc)), loc),
adamc@67 208 (L'.KArrow (ran,
adamc@67 209 (L'.KArrow ((L'.KRecord dom, loc),
adamc@67 210 ran), loc)), loc)), loc)
adamc@67 211
adamc@3 212 fun elabCon env (c, loc) =
adamc@3 213 case c of
adamc@3 214 L.CAnnot (c, k) =>
adamc@3 215 let
adamc@3 216 val k' = elabKind k
adamc@3 217 val (c', ck) = elabCon env c
adamc@3 218 in
adamc@5 219 checkKind env c' ck k';
adamc@3 220 (c', k')
adamc@3 221 end
adamc@3 222
adamc@3 223 | L.TFun (t1, t2) =>
adamc@3 224 let
adamc@3 225 val (t1', k1) = elabCon env t1
adamc@3 226 val (t2', k2) = elabCon env t2
adamc@3 227 in
adamc@5 228 checkKind env t1' k1 ktype;
adamc@5 229 checkKind env t2' k2 ktype;
adamc@3 230 ((L'.TFun (t1', t2'), loc), ktype)
adamc@3 231 end
adamc@3 232 | L.TCFun (e, x, k, t) =>
adamc@3 233 let
adamc@3 234 val e' = elabExplicitness e
adamc@3 235 val k' = elabKind k
adamc@3 236 val env' = E.pushCRel env x k'
adamc@3 237 val (t', tk) = elabCon env' t
adamc@3 238 in
adamc@5 239 checkKind env t' tk ktype;
adamc@3 240 ((L'.TCFun (e', x, k', t'), loc), ktype)
adamc@3 241 end
adamc@3 242 | L.TRecord c =>
adamc@3 243 let
adamc@3 244 val (c', ck) = elabCon env c
adamc@3 245 val k = (L'.KRecord ktype, loc)
adamc@3 246 in
adamc@5 247 checkKind env c' ck k;
adamc@3 248 ((L'.TRecord c', loc), ktype)
adamc@3 249 end
adamc@3 250
adamc@34 251 | L.CVar ([], s) =>
adamc@3 252 (case E.lookupC env s of
adamc@9 253 E.NotBound =>
adamc@5 254 (conError env (UnboundCon (loc, s));
adamc@3 255 (cerror, kerror))
adamc@9 256 | E.Rel (n, k) =>
adamc@3 257 ((L'.CRel n, loc), k)
adamc@9 258 | E.Named (n, k) =>
adamc@3 259 ((L'.CNamed n, loc), k))
adamc@34 260 | L.CVar (m1 :: ms, s) =>
adamc@34 261 (case E.lookupStr env m1 of
adamc@42 262 NONE => (conError env (UnboundStrInCon (loc, m1));
adamc@34 263 (cerror, kerror))
adamc@34 264 | SOME (n, sgn) =>
adamc@34 265 let
adamc@34 266 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34 267 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34 268 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@34 269 (strerror, sgnerror))
adamc@34 270 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34 271 ((L'.StrVar n, loc), sgn) ms
adamc@34 272
adamc@34 273 val k = case E.projectCon env {sgn = sgn, str = str, field = s} of
adamc@34 274 NONE => (conError env (UnboundCon (loc, s));
adamc@34 275 kerror)
adamc@34 276 | SOME (k, _) => k
adamc@34 277 in
adamc@34 278 ((L'.CModProj (n, ms, s), loc), k)
adamc@34 279 end)
adamc@34 280
adamc@3 281 | L.CApp (c1, c2) =>
adamc@3 282 let
adamc@3 283 val (c1', k1) = elabCon env c1
adamc@3 284 val (c2', k2) = elabCon env c2
adamc@3 285 val dom = kunif ()
adamc@3 286 val ran = kunif ()
adamc@3 287 in
adamc@5 288 checkKind env c1' k1 (L'.KArrow (dom, ran), loc);
adamc@5 289 checkKind env c2' k2 dom;
adamc@3 290 ((L'.CApp (c1', c2'), loc), ran)
adamc@3 291 end
adamc@67 292 | L.CAbs (x, ko, t) =>
adamc@3 293 let
adamc@67 294 val k' = case ko of
adamc@67 295 NONE => kunif ()
adamc@67 296 | SOME k => elabKind k
adamc@3 297 val env' = E.pushCRel env x k'
adamc@3 298 val (t', tk) = elabCon env' t
adamc@3 299 in
adamc@8 300 ((L'.CAbs (x, k', t'), loc),
adamc@3 301 (L'.KArrow (k', tk), loc))
adamc@3 302 end
adamc@3 303
adamc@3 304 | L.CName s =>
adamc@3 305 ((L'.CName s, loc), kname)
adamc@3 306
adamc@3 307 | L.CRecord xcs =>
adamc@3 308 let
adamc@3 309 val k = kunif ()
adamc@3 310
adamc@3 311 val xcs' = map (fn (x, c) =>
adamc@3 312 let
adamc@3 313 val (x', xk) = elabCon env x
adamc@3 314 val (c', ck) = elabCon env c
adamc@3 315 in
adamc@5 316 checkKind env x' xk kname;
adamc@5 317 checkKind env c' ck k;
adamc@3 318 (x', c')
adamc@3 319 end) xcs
adamc@67 320
adamc@67 321 val rc = (L'.CRecord (k, xcs'), loc)
adamc@67 322 (* Add duplicate field checking later. *)
adamc@3 323 in
adamc@67 324 (rc, (L'.KRecord k, loc))
adamc@3 325 end
adamc@3 326 | L.CConcat (c1, c2) =>
adamc@3 327 let
adamc@3 328 val (c1', k1) = elabCon env c1
adamc@3 329 val (c2', k2) = elabCon env c2
adamc@3 330 val ku = kunif ()
adamc@3 331 val k = (L'.KRecord ku, loc)
adamc@3 332 in
adamc@5 333 checkKind env c1' k1 k;
adamc@5 334 checkKind env c2' k2 k;
adamc@3 335 ((L'.CConcat (c1', c2'), loc), k)
adamc@3 336 end
adamc@67 337 | L.CFold =>
adamc@67 338 let
adamc@67 339 val dom = kunif ()
adamc@67 340 val ran = kunif ()
adamc@67 341 in
adamc@67 342 ((L'.CFold (dom, ran), loc),
adamc@67 343 foldKind (dom, ran, loc))
adamc@67 344 end
adamc@3 345
adamc@18 346 | L.CWild k =>
adamc@18 347 let
adamc@18 348 val k' = elabKind k
adamc@18 349 in
adamc@18 350 (cunif k', k')
adamc@18 351 end
adamc@18 352
adamc@6 353 fun kunifsRemain k =
adamc@6 354 case k of
adamc@6 355 L'.KUnif (_, ref NONE) => true
adamc@6 356 | _ => false
adamc@10 357 fun cunifsRemain c =
adamc@10 358 case c of
adamc@10 359 L'.CUnif (_, _, ref NONE) => true
adamc@10 360 | _ => false
adamc@6 361
adamc@6 362 val kunifsInKind = U.Kind.exists kunifsRemain
adamc@6 363 val kunifsInCon = U.Con.exists {kind = kunifsRemain,
adamc@6 364 con = fn _ => false}
adamc@10 365 val kunifsInExp = U.Exp.exists {kind = kunifsRemain,
adamc@10 366 con = fn _ => false,
adamc@10 367 exp = fn _ => false}
adamc@10 368
adamc@10 369 val cunifsInCon = U.Con.exists {kind = fn _ => false,
adamc@10 370 con = cunifsRemain}
adamc@10 371 val cunifsInExp = U.Exp.exists {kind = fn _ => false,
adamc@10 372 con = cunifsRemain,
adamc@10 373 exp = fn _ => false}
adamc@10 374
adamc@10 375 fun occursCon r =
adamc@10 376 U.Con.exists {kind = fn _ => false,
adamc@10 377 con = fn L'.CUnif (_, _, r') => r = r'
adamc@10 378 | _ => false}
adamc@10 379
adamc@10 380 datatype cunify_error =
adamc@10 381 CKind of L'.kind * L'.kind * kunify_error
adamc@10 382 | COccursCheckFailed of L'.con * L'.con
adamc@10 383 | CIncompatible of L'.con * L'.con
adamc@10 384 | CExplicitness of L'.con * L'.con
adamc@12 385 | CKindof of L'.con
adamc@12 386 | CRecordFailure
adamc@10 387
adamc@10 388 exception CUnify' of cunify_error
adamc@10 389
adamc@10 390 fun cunifyError env err =
adamc@10 391 case err of
adamc@10 392 CKind (k1, k2, kerr) =>
adamc@10 393 (eprefaces "Kind unification failure"
adamc@10 394 [("Kind 1", p_kind k1),
adamc@10 395 ("Kind 2", p_kind k2)];
adamc@10 396 kunifyError kerr)
adamc@10 397 | COccursCheckFailed (c1, c2) =>
adamc@10 398 eprefaces "Constructor occurs check failed"
adamc@10 399 [("Con 1", p_con env c1),
adamc@10 400 ("Con 2", p_con env c2)]
adamc@10 401 | CIncompatible (c1, c2) =>
adamc@10 402 eprefaces "Incompatible constructors"
adamc@10 403 [("Con 1", p_con env c1),
adamc@10 404 ("Con 2", p_con env c2)]
adamc@10 405 | CExplicitness (c1, c2) =>
adamc@10 406 eprefaces "Differing constructor function explicitness"
adamc@10 407 [("Con 1", p_con env c1),
adamc@10 408 ("Con 2", p_con env c2)]
adamc@12 409 | CKindof c =>
adamc@12 410 eprefaces "Kind unification variable blocks kindof calculation"
adamc@12 411 [("Con", p_con env c)]
adamc@12 412 | CRecordFailure =>
adamc@12 413 eprefaces "Can't unify record constructors" []
adamc@10 414
adamc@13 415 exception SynUnif = E.SynUnif
adamc@13 416 val liftConInCon = E.liftConInCon
adamc@12 417
adamc@12 418 val subConInCon =
adamc@12 419 U.Con.mapB {kind = fn k => k,
adamc@12 420 con = fn (xn, rep) => fn c =>
adamc@12 421 case c of
adamc@12 422 L'.CRel xn' =>
adamc@12 423 if xn = xn' then
adamc@12 424 #1 rep
adamc@12 425 else
adamc@12 426 c
adamc@17 427 (*| L'.CUnif _ => raise SynUnif*)
adamc@12 428 | _ => c,
adamc@12 429 bind = fn ((xn, rep), U.Con.Rel _) => (xn+1, liftConInCon 0 rep)
adamc@12 430 | (ctx, _) => ctx}
adamc@12 431
adamc@43 432 fun subStrInSgn (m1, m2) =
adamc@43 433 U.Sgn.map {kind = fn k => k,
adamc@43 434 con = fn c as L'.CModProj (m1', ms, x) =>
adamc@43 435 if m1 = m1' then
adamc@43 436 L'.CModProj (m2, ms, x)
adamc@43 437 else
adamc@43 438 c
adamc@43 439 | c => c,
adamc@43 440 sgn_item = fn sgi => sgi,
adamc@43 441 sgn = fn sgn => sgn}
adamc@43 442
adamc@12 443 type record_summary = {
adamc@12 444 fields : (L'.con * L'.con) list,
adamc@12 445 unifs : (L'.con * L'.con option ref) list,
adamc@12 446 others : L'.con list
adamc@12 447 }
adamc@12 448
adamc@12 449 fun summaryToCon {fields, unifs, others} =
adamc@12 450 let
adamc@12 451 val c = (L'.CRecord (ktype, []), dummy)
adamc@12 452 val c = List.foldr (fn (c', c) => (L'.CConcat (c', c), dummy)) c others
adamc@12 453 val c = List.foldr (fn ((c', _), c) => (L'.CConcat (c', c), dummy)) c unifs
adamc@12 454 in
adamc@12 455 (L'.CConcat ((L'.CRecord (ktype, fields), dummy), c), dummy)
adamc@12 456 end
adamc@12 457
adamc@12 458 fun p_summary env s = p_con env (summaryToCon s)
adamc@12 459
adamc@12 460 exception CUnify of L'.con * L'.con * cunify_error
adamc@12 461
adamc@12 462 fun hnormKind (kAll as (k, _)) =
adamc@12 463 case k of
adamc@12 464 L'.KUnif (_, ref (SOME k)) => hnormKind k
adamc@12 465 | _ => kAll
adamc@12 466
adamc@12 467 fun kindof env (c, loc) =
adamc@12 468 case c of
adamc@12 469 L'.TFun _ => ktype
adamc@12 470 | L'.TCFun _ => ktype
adamc@12 471 | L'.TRecord _ => ktype
adamc@12 472
adamc@12 473 | L'.CRel xn => #2 (E.lookupCRel env xn)
adamc@12 474 | L'.CNamed xn => #2 (E.lookupCNamed env xn)
adamc@34 475 | L'.CModProj (n, ms, x) =>
adamc@34 476 let
adamc@34 477 val (_, sgn) = E.lookupStrNamed env n
adamc@34 478 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34 479 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34 480 NONE => raise Fail "kindof: Unknown substructure"
adamc@34 481 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34 482 ((L'.StrVar n, loc), sgn) ms
adamc@34 483 in
adamc@34 484 case E.projectCon env {sgn = sgn, str = str, field = x} of
adamc@34 485 NONE => raise Fail "kindof: Unknown con in structure"
adamc@34 486 | SOME (k, _) => k
adamc@34 487 end
adamc@34 488
adamc@12 489 | L'.CApp (c, _) =>
adamc@12 490 (case #1 (hnormKind (kindof env c)) of
adamc@12 491 L'.KArrow (_, k) => k
adamc@12 492 | L'.KError => kerror
adamc@12 493 | _ => raise CUnify' (CKindof c))
adamc@12 494 | L'.CAbs (x, k, c) => (L'.KArrow (k, kindof (E.pushCRel env x k) c), loc)
adamc@12 495
adamc@12 496 | L'.CName _ => kname
adamc@12 497
adamc@12 498 | L'.CRecord (k, _) => (L'.KRecord k, loc)
adamc@12 499 | L'.CConcat (c, _) => kindof env c
adamc@67 500 | L'.CFold (dom, ran) => foldKind (dom, ran, loc)
adamc@12 501
adamc@12 502 | L'.CError => kerror
adamc@12 503 | L'.CUnif (k, _, _) => k
adamc@12 504
adamc@12 505 fun unifyRecordCons env (c1, c2) =
adamc@12 506 let
adamc@12 507 val k1 = kindof env c1
adamc@12 508 val k2 = kindof env c2
adamc@12 509 in
adamc@12 510 unifyKinds k1 k2;
adamc@12 511 unifySummaries env (k1, recordSummary env c1, recordSummary env c2)
adamc@12 512 end
adamc@12 513
adamc@12 514 and recordSummary env c : record_summary =
adamc@12 515 case hnormCon env c of
adamc@12 516 (L'.CRecord (_, xcs), _) => {fields = xcs, unifs = [], others = []}
adamc@12 517 | (L'.CConcat (c1, c2), _) =>
adamc@12 518 let
adamc@12 519 val s1 = recordSummary env c1
adamc@12 520 val s2 = recordSummary env c2
adamc@12 521 in
adamc@12 522 {fields = #fields s1 @ #fields s2,
adamc@12 523 unifs = #unifs s1 @ #unifs s2,
adamc@12 524 others = #others s1 @ #others s2}
adamc@12 525 end
adamc@12 526 | (L'.CUnif (_, _, ref (SOME c)), _) => recordSummary env c
adamc@12 527 | c' as (L'.CUnif (_, _, r), _) => {fields = [], unifs = [(c', r)], others = []}
adamc@12 528 | c' => {fields = [], unifs = [], others = [c']}
adamc@12 529
adamc@12 530 and consEq env (c1, c2) =
adamc@12 531 (unifyCons env c1 c2;
adamc@12 532 true)
adamc@12 533 handle CUnify _ => false
adamc@12 534
adamc@12 535 and unifySummaries env (k, s1 : record_summary, s2 : record_summary) =
adamc@12 536 let
adamc@14 537 (*val () = eprefaces "Summaries" [("#1", p_summary env s1),
adamc@14 538 ("#2", p_summary env s2)]*)
adamc@12 539
adamc@12 540 fun eatMatching p (ls1, ls2) =
adamc@12 541 let
adamc@12 542 fun em (ls1, ls2, passed1) =
adamc@12 543 case ls1 of
adamc@12 544 [] => (rev passed1, ls2)
adamc@12 545 | h1 :: t1 =>
adamc@12 546 let
adamc@12 547 fun search (ls2', passed2) =
adamc@12 548 case ls2' of
adamc@12 549 [] => em (t1, ls2, h1 :: passed1)
adamc@12 550 | h2 :: t2 =>
adamc@12 551 if p (h1, h2) then
adamc@12 552 em (t1, List.revAppend (passed2, t2), passed1)
adamc@12 553 else
adamc@12 554 search (t2, h2 :: passed2)
adamc@12 555 in
adamc@12 556 search (ls2, [])
adamc@12 557 end
adamc@12 558 in
adamc@12 559 em (ls1, ls2, [])
adamc@12 560 end
adamc@12 561
adamc@12 562 val (fs1, fs2) = eatMatching (fn ((x1, c1), (x2, c2)) =>
adamc@12 563 if consEq env (x1, x2) then
adamc@12 564 (unifyCons env c1 c2;
adamc@12 565 true)
adamc@12 566 else
adamc@12 567 false) (#fields s1, #fields s2)
adamc@14 568 (*val () = eprefaces "Summaries2" [("#1", p_summary env {fields = fs1, unifs = #unifs s1, others = #others s1}),
adamc@14 569 ("#2", p_summary env {fields = fs2, unifs = #unifs s2, others = #others s2})]*)
adamc@12 570 val (unifs1, unifs2) = eatMatching (fn ((_, r1), (_, r2)) => r1 = r2) (#unifs s1, #unifs s2)
adamc@12 571 val (others1, others2) = eatMatching (consEq env) (#others s1, #others s2)
adamc@12 572
adamc@12 573 fun unifFields (fs, others, unifs) =
adamc@12 574 case (fs, others, unifs) of
adamc@12 575 ([], [], _) => ([], [], unifs)
adamc@12 576 | (_, _, []) => (fs, others, [])
adamc@12 577 | (_, _, (_, r) :: rest) =>
adamc@12 578 let
adamc@12 579 val r' = ref NONE
adamc@12 580 val cr' = (L'.CUnif (k, "recd", r'), dummy)
adamc@12 581
adamc@12 582 val prefix = case (fs, others) of
adamc@12 583 ([], other :: others) =>
adamc@12 584 List.foldl (fn (other, c) =>
adamc@12 585 (L'.CConcat (c, other), dummy))
adamc@12 586 other others
adamc@12 587 | (fs, []) =>
adamc@12 588 (L'.CRecord (k, fs), dummy)
adamc@12 589 | (fs, others) =>
adamc@12 590 List.foldl (fn (other, c) =>
adamc@12 591 (L'.CConcat (c, other), dummy))
adamc@12 592 (L'.CRecord (k, fs), dummy) others
adamc@12 593 in
adamc@12 594 r := SOME (L'.CConcat (prefix, cr'), dummy);
adamc@12 595 ([], [], (cr', r') :: rest)
adamc@12 596 end
adamc@12 597
adamc@12 598 val (fs1, others1, unifs2) = unifFields (fs1, others1, unifs2)
adamc@12 599 val (fs2, others2, unifs1) = unifFields (fs2, others2, unifs1)
adamc@12 600
adamc@12 601 val clear1 = case (fs1, others1) of
adamc@12 602 ([], []) => true
adamc@12 603 | _ => false
adamc@12 604 val clear2 = case (fs2, others2) of
adamc@12 605 ([], []) => true
adamc@12 606 | _ => false
adamc@12 607 val empty = (L'.CRecord (k, []), dummy)
adamc@12 608 fun pairOffUnifs (unifs1, unifs2) =
adamc@12 609 case (unifs1, unifs2) of
adamc@12 610 ([], _) =>
adamc@12 611 if clear1 then
adamc@12 612 List.app (fn (_, r) => r := SOME empty) unifs2
adamc@12 613 else
adamc@12 614 raise CUnify' CRecordFailure
adamc@12 615 | (_, []) =>
adamc@12 616 if clear2 then
adamc@12 617 List.app (fn (_, r) => r := SOME empty) unifs1
adamc@12 618 else
adamc@12 619 raise CUnify' CRecordFailure
adamc@12 620 | ((c1, _) :: rest1, (_, r2) :: rest2) =>
adamc@12 621 (r2 := SOME c1;
adamc@12 622 pairOffUnifs (rest1, rest2))
adamc@12 623 in
adamc@12 624 pairOffUnifs (unifs1, unifs2)
adamc@12 625 end
adamc@12 626
adamc@34 627 and hnormCon env (cAll as (c, loc)) =
adamc@11 628 case c of
adamc@11 629 L'.CUnif (_, _, ref (SOME c)) => hnormCon env c
adamc@11 630
adamc@11 631 | L'.CNamed xn =>
adamc@11 632 (case E.lookupCNamed env xn of
adamc@11 633 (_, _, SOME c') => hnormCon env c'
adamc@11 634 | _ => cAll)
adamc@11 635
adamc@34 636 | L'.CModProj (n, ms, x) =>
adamc@34 637 let
adamc@34 638 val (_, sgn) = E.lookupStrNamed env n
adamc@34 639 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34 640 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34 641 NONE => raise Fail "hnormCon: Unknown substructure"
adamc@34 642 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34 643 ((L'.StrVar n, loc), sgn) ms
adamc@34 644 in
adamc@34 645 case E.projectCon env {sgn = sgn, str = str, field = x} of
adamc@34 646 NONE => raise Fail "kindof: Unknown con in structure"
adamc@34 647 | SOME (_, NONE) => cAll
adamc@34 648 | SOME (_, SOME c) => hnormCon env c
adamc@34 649 end
adamc@34 650
adamc@12 651 | L'.CApp (c1, c2) =>
adamc@67 652 (case #1 (hnormCon env c1) of
adamc@67 653 L'.CAbs (_, _, cb) =>
adamc@12 654 ((hnormCon env (subConInCon (0, c2) cb))
adamc@12 655 handle SynUnif => cAll)
adamc@67 656 | L'.CApp (c', i) =>
adamc@67 657 (case #1 (hnormCon env c') of
adamc@67 658 L'.CApp (c', f) =>
adamc@67 659 (case #1 (hnormCon env c') of
adamc@67 660 L'.CFold ks =>
adamc@67 661 (case #1 (hnormCon env c2) of
adamc@67 662 L'.CRecord (_, []) => hnormCon env i
adamc@67 663 | L'.CRecord (k, (x, c) :: rest) =>
adamc@67 664 hnormCon env
adamc@67 665 (L'.CApp ((L'.CApp ((L'.CApp (f, x), loc), c), loc),
adamc@67 666 (L'.CApp ((L'.CApp ((L'.CApp ((L'.CFold ks, loc), f), loc), i), loc),
adamc@67 667 (L'.CRecord (k, rest), loc)), loc)), loc)
adamc@71 668 | L'.CConcat ((L'.CRecord (k, (x, c) :: rest), _), rest') =>
adamc@71 669 let
adamc@71 670 val rest'' = (L'.CConcat ((L'.CRecord (k, rest), loc), rest'), loc)
adamc@71 671 in
adamc@71 672 hnormCon env
adamc@71 673 (L'.CApp ((L'.CApp ((L'.CApp (f, x), loc), c), loc),
adamc@71 674 (L'.CApp ((L'.CApp ((L'.CApp ((L'.CFold ks, loc), f), loc), i), loc),
adamc@71 675 rest''), loc)), loc)
adamc@71 676 end
adamc@67 677 | _ => cAll)
adamc@67 678 | _ => cAll)
adamc@67 679 | _ => cAll)
adamc@12 680 | _ => cAll)
adamc@12 681
adamc@12 682 | L'.CConcat (c1, c2) =>
adamc@12 683 (case (hnormCon env c1, hnormCon env c2) of
adamc@12 684 ((L'.CRecord (k, xcs1), loc), (L'.CRecord (_, xcs2), _)) =>
adamc@12 685 (L'.CRecord (k, xcs1 @ xcs2), loc)
adamc@71 686 | ((L'.CRecord (_, []), _), c2') => c2'
adamc@71 687 | ((L'.CConcat (c11, c12), loc), c2') =>
adamc@71 688 hnormCon env (L'.CConcat (c11, (L'.CConcat (c12, c2'), loc)), loc)
adamc@12 689 | _ => cAll)
adamc@12 690
adamc@11 691 | _ => cAll
adamc@11 692
adamc@12 693 and unifyCons' env c1 c2 =
adamc@11 694 unifyCons'' env (hnormCon env c1) (hnormCon env c2)
adamc@11 695
adamc@11 696 and unifyCons'' env (c1All as (c1, _)) (c2All as (c2, _)) =
adamc@10 697 let
adamc@10 698 fun err f = raise CUnify' (f (c1All, c2All))
adamc@12 699
adamc@12 700 fun isRecord () = unifyRecordCons env (c1All, c2All)
adamc@10 701 in
adamc@10 702 case (c1, c2) of
adamc@10 703 (L'.TFun (d1, r1), L'.TFun (d2, r2)) =>
adamc@10 704 (unifyCons' env d1 d2;
adamc@10 705 unifyCons' env r1 r2)
adamc@10 706 | (L'.TCFun (expl1, x1, d1, r1), L'.TCFun (expl2, _, d2, r2)) =>
adamc@10 707 if expl1 <> expl2 then
adamc@10 708 err CExplicitness
adamc@10 709 else
adamc@10 710 (unifyKinds d1 d2;
adamc@10 711 unifyCons' (E.pushCRel env x1 d1) r1 r2)
adamc@10 712 | (L'.TRecord r1, L'.TRecord r2) => unifyCons' env r1 r2
adamc@10 713
adamc@10 714 | (L'.CRel n1, L'.CRel n2) =>
adamc@10 715 if n1 = n2 then
adamc@10 716 ()
adamc@10 717 else
adamc@10 718 err CIncompatible
adamc@10 719 | (L'.CNamed n1, L'.CNamed n2) =>
adamc@10 720 if n1 = n2 then
adamc@10 721 ()
adamc@10 722 else
adamc@10 723 err CIncompatible
adamc@10 724
adamc@10 725 | (L'.CApp (d1, r1), L'.CApp (d2, r2)) =>
adamc@10 726 (unifyCons' env d1 d2;
adamc@10 727 unifyCons' env r1 r2)
adamc@10 728 | (L'.CAbs (x1, k1, c1), L'.CAbs (_, k2, c2)) =>
adamc@10 729 (unifyKinds k1 k2;
adamc@10 730 unifyCons' (E.pushCRel env x1 k1) c1 c2)
adamc@10 731
adamc@10 732 | (L'.CName n1, L'.CName n2) =>
adamc@10 733 if n1 = n2 then
adamc@10 734 ()
adamc@10 735 else
adamc@10 736 err CIncompatible
adamc@10 737
adamc@34 738 | (L'.CModProj (n1, ms1, x1), L'.CModProj (n2, ms2, x2)) =>
adamc@34 739 if n1 = n2 andalso ms1 = ms2 andalso x1 = x2 then
adamc@34 740 ()
adamc@34 741 else
adamc@34 742 err CIncompatible
adamc@34 743
adamc@10 744 | (L'.CError, _) => ()
adamc@10 745 | (_, L'.CError) => ()
adamc@10 746
adamc@10 747 | (L'.CUnif (_, _, ref (SOME c1All)), _) => unifyCons' env c1All c2All
adamc@10 748 | (_, L'.CUnif (_, _, ref (SOME c2All))) => unifyCons' env c1All c2All
adamc@10 749
adamc@10 750 | (L'.CUnif (k1, _, r1), L'.CUnif (k2, _, r2)) =>
adamc@10 751 if r1 = r2 then
adamc@10 752 ()
adamc@10 753 else
adamc@10 754 (unifyKinds k1 k2;
adamc@10 755 r1 := SOME c2All)
adamc@10 756
adamc@10 757 | (L'.CUnif (_, _, r), _) =>
adamc@10 758 if occursCon r c2All then
adamc@10 759 err COccursCheckFailed
adamc@10 760 else
adamc@10 761 r := SOME c2All
adamc@10 762 | (_, L'.CUnif (_, _, r)) =>
adamc@10 763 if occursCon r c1All then
adamc@10 764 err COccursCheckFailed
adamc@10 765 else
adamc@10 766 r := SOME c1All
adamc@10 767
adamc@12 768 | (L'.CRecord _, _) => isRecord ()
adamc@12 769 | (_, L'.CRecord _) => isRecord ()
adamc@12 770 | (L'.CConcat _, _) => isRecord ()
adamc@12 771 | (_, L'.CConcat _) => isRecord ()
adamc@12 772
adamc@71 773 | (L'.CFold (dom1, ran1), L'.CFold (dom2, ran2)) =>
adamc@71 774 (unifyKinds dom1 dom2;
adamc@71 775 unifyKinds ran1 ran2)
adamc@71 776
adamc@10 777 | _ => err CIncompatible
adamc@10 778 end
adamc@10 779
adamc@12 780 and unifyCons env c1 c2 =
adamc@10 781 unifyCons' env c1 c2
adamc@10 782 handle CUnify' err => raise CUnify (c1, c2, err)
adamc@10 783 | KUnify args => raise CUnify (c1, c2, CKind args)
adamc@10 784
adamc@10 785 datatype exp_error =
adamc@10 786 UnboundExp of ErrorMsg.span * string
adamc@34 787 | UnboundStrInExp of ErrorMsg.span * string
adamc@10 788 | Unify of L'.exp * L'.con * L'.con * cunify_error
adamc@11 789 | Unif of string * L'.con
adamc@11 790 | WrongForm of string * L'.exp * L'.con
adamc@10 791
adamc@10 792 fun expError env err =
adamc@10 793 case err of
adamc@10 794 UnboundExp (loc, s) =>
adamc@10 795 ErrorMsg.errorAt loc ("Unbound expression variable " ^ s)
adamc@34 796 | UnboundStrInExp (loc, s) =>
adamc@34 797 ErrorMsg.errorAt loc ("Unbound structure " ^ s)
adamc@10 798 | Unify (e, c1, c2, uerr) =>
adamc@10 799 (ErrorMsg.errorAt (#2 e) "Unification failure";
adamc@10 800 eprefaces' [("Expression", p_exp env e),
adamc@10 801 ("Have con", p_con env c1),
adamc@10 802 ("Need con", p_con env c2)];
adamc@10 803 cunifyError env uerr)
adamc@11 804 | Unif (action, c) =>
adamc@11 805 (ErrorMsg.errorAt (#2 c) ("Unification variable blocks " ^ action);
adamc@11 806 eprefaces' [("Con", p_con env c)])
adamc@11 807 | WrongForm (variety, e, t) =>
adamc@11 808 (ErrorMsg.errorAt (#2 e) ("Expression is not a " ^ variety);
adamc@11 809 eprefaces' [("Expression", p_exp env e),
adamc@11 810 ("Type", p_con env t)])
adamc@10 811
adamc@10 812 fun checkCon env e c1 c2 =
adamc@10 813 unifyCons env c1 c2
adamc@10 814 handle CUnify (c1, c2, err) =>
adamc@10 815 expError env (Unify (e, c1, c2, err))
adamc@10 816
adamc@14 817 fun primType env p =
adamc@56 818 case p of
adamc@56 819 P.Int _ => !int
adamc@56 820 | P.Float _ => !float
adamc@56 821 | P.String _ => !string
adamc@14 822
adamc@71 823 fun recCons (k, nm, v, rest, loc) =
adamc@71 824 (L'.CConcat ((L'.CRecord (k, [(nm, v)]), loc),
adamc@71 825 rest), loc)
adamc@71 826
adamc@71 827 fun foldType (dom, loc) =
adamc@71 828 (L'.TCFun (L'.Explicit, "ran", (L'.KArrow ((L'.KRecord dom, loc), (L'.KType, loc)), loc),
adamc@71 829 (L'.TFun ((L'.TCFun (L'.Explicit, "nm", (L'.KName, loc),
adamc@71 830 (L'.TCFun (L'.Explicit, "v", dom,
adamc@71 831 (L'.TCFun (L'.Explicit, "rest", (L'.KRecord dom, loc),
adamc@71 832 (L'.TFun ((L'.CApp ((L'.CRel 3, loc), (L'.CRel 0, loc)), loc),
adamc@71 833 (L'.CApp ((L'.CRel 3, loc),
adamc@71 834 recCons (dom,
adamc@71 835 (L'.CRel 2, loc),
adamc@71 836 (L'.CRel 1, loc),
adamc@71 837 (L'.CRel 0, loc),
adamc@71 838 loc)), loc)), loc)),
adamc@71 839 loc)), loc)), loc),
adamc@71 840 (L'.TFun ((L'.CApp ((L'.CRel 0, loc), (L'.CRecord (dom, []), loc)), loc),
adamc@71 841 (L'.TCFun (L'.Explicit, "r", (L'.KRecord dom, loc),
adamc@71 842 (L'.CApp ((L'.CRel 1, loc), (L'.CRel 0, loc)), loc)), loc)),
adamc@71 843 loc)), loc)), loc)
adamc@71 844
adamc@15 845 fun typeof env (e, loc) =
adamc@15 846 case e of
adamc@56 847 L'.EPrim p => primType env p
adamc@15 848 | L'.ERel n => #2 (E.lookupERel env n)
adamc@15 849 | L'.ENamed n => #2 (E.lookupENamed env n)
adamc@34 850 | L'.EModProj (n, ms, x) =>
adamc@34 851 let
adamc@34 852 val (_, sgn) = E.lookupStrNamed env n
adamc@34 853 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34 854 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34 855 NONE => raise Fail "kindof: Unknown substructure"
adamc@34 856 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34 857 ((L'.StrVar n, loc), sgn) ms
adamc@34 858 in
adamc@34 859 case E.projectVal env {sgn = sgn, str = str, field = x} of
adamc@34 860 NONE => raise Fail "typeof: Unknown val in structure"
adamc@34 861 | SOME t => t
adamc@34 862 end
adamc@34 863
adamc@15 864 | L'.EApp (e1, _) =>
adamc@15 865 (case #1 (typeof env e1) of
adamc@15 866 L'.TFun (_, c) => c
adamc@15 867 | _ => raise Fail "typeof: Bad EApp")
adamc@26 868 | L'.EAbs (_, _, ran, _) => ran
adamc@15 869 | L'.ECApp (e1, c) =>
adamc@15 870 (case #1 (typeof env e1) of
adamc@15 871 L'.TCFun (_, _, _, c1) => subConInCon (0, c) c1
adamc@15 872 | _ => raise Fail "typeof: Bad ECApp")
adamc@15 873 | L'.ECAbs (expl, x, k, e1) => (L'.TCFun (expl, x, k, typeof (E.pushCRel env x k) e1), loc)
adamc@15 874
adamc@29 875 | L'.ERecord xes => (L'.TRecord (L'.CRecord (ktype, map (fn (x, _, t) => (x, t)) xes), loc), loc)
adamc@15 876 | L'.EField (_, _, {field, ...}) => field
adamc@71 877 | L'.EFold dom => foldType (dom, loc)
adamc@15 878
adamc@15 879 | L'.EError => cerror
adamc@15 880
adamc@15 881 fun elabHead env (e as (_, loc)) t =
adamc@15 882 let
adamc@15 883 fun unravel (t, e) =
adamc@15 884 case hnormCon env t of
adamc@15 885 (L'.TCFun (L'.Implicit, x, k, t'), _) =>
adamc@15 886 let
adamc@15 887 val u = cunif k
adamc@15 888 in
adamc@15 889 unravel (subConInCon (0, u) t',
adamc@15 890 (L'.ECApp (e, u), loc))
adamc@15 891 end
adamc@15 892 | _ => (e, t)
adamc@15 893 in
adamc@15 894 unravel (t, e)
adamc@15 895 end
adamc@15 896
adamc@10 897 fun elabExp env (e, loc) =
adamc@10 898 case e of
adamc@10 899 L.EAnnot (e, t) =>
adamc@10 900 let
adamc@10 901 val (e', et) = elabExp env e
adamc@10 902 val (t', _) = elabCon env t
adamc@10 903 in
adamc@10 904 checkCon env e' et t';
adamc@10 905 (e', t')
adamc@10 906 end
adamc@10 907
adamc@56 908 | L.EPrim p => ((L'.EPrim p, loc), primType env p)
adamc@34 909 | L.EVar ([], s) =>
adamc@10 910 (case E.lookupE env s of
adamc@10 911 E.NotBound =>
adamc@10 912 (expError env (UnboundExp (loc, s));
adamc@10 913 (eerror, cerror))
adamc@10 914 | E.Rel (n, t) => ((L'.ERel n, loc), t)
adamc@10 915 | E.Named (n, t) => ((L'.ENamed n, loc), t))
adamc@34 916 | L.EVar (m1 :: ms, s) =>
adamc@34 917 (case E.lookupStr env m1 of
adamc@42 918 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@34 919 (eerror, cerror))
adamc@34 920 | SOME (n, sgn) =>
adamc@34 921 let
adamc@34 922 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34 923 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34 924 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@34 925 (strerror, sgnerror))
adamc@34 926 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34 927 ((L'.StrVar n, loc), sgn) ms
adamc@34 928
adamc@34 929 val t = case E.projectVal env {sgn = sgn, str = str, field = s} of
adamc@34 930 NONE => (expError env (UnboundExp (loc, s));
adamc@34 931 cerror)
adamc@34 932 | SOME t => t
adamc@34 933 in
adamc@34 934 ((L'.EModProj (n, ms, s), loc), t)
adamc@34 935 end)
adamc@34 936
adamc@10 937 | L.EApp (e1, e2) =>
adamc@10 938 let
adamc@10 939 val (e1', t1) = elabExp env e1
adamc@15 940 val (e1', t1) = elabHead env e1' t1
adamc@10 941 val (e2', t2) = elabExp env e2
adamc@10 942
adamc@10 943 val dom = cunif ktype
adamc@10 944 val ran = cunif ktype
adamc@10 945 val t = (L'.TFun (dom, ran), dummy)
adamc@10 946 in
adamc@10 947 checkCon env e1' t1 t;
adamc@10 948 checkCon env e2' t2 dom;
adamc@10 949 ((L'.EApp (e1', e2'), loc), ran)
adamc@10 950 end
adamc@10 951 | L.EAbs (x, to, e) =>
adamc@10 952 let
adamc@10 953 val t' = case to of
adamc@10 954 NONE => cunif ktype
adamc@10 955 | SOME t =>
adamc@10 956 let
adamc@10 957 val (t', tk) = elabCon env t
adamc@10 958 in
adamc@10 959 checkKind env t' tk ktype;
adamc@10 960 t'
adamc@10 961 end
adamc@10 962 val (e', et) = elabExp (E.pushERel env x t') e
adamc@10 963 in
adamc@26 964 ((L'.EAbs (x, t', et, e'), loc),
adamc@10 965 (L'.TFun (t', et), loc))
adamc@10 966 end
adamc@10 967 | L.ECApp (e, c) =>
adamc@10 968 let
adamc@10 969 val (e', et) = elabExp env e
adamc@15 970 val (e', et) = elabHead env e' et
adamc@10 971 val (c', ck) = elabCon env c
adamc@10 972 in
adamc@11 973 case #1 (hnormCon env et) of
adamc@11 974 L'.CError => (eerror, cerror)
adamc@11 975 | L'.TCFun (_, _, k, eb) =>
adamc@11 976 let
adamc@11 977 val () = checkKind env c' ck k
adamc@11 978 val eb' = subConInCon (0, c') eb
adamc@11 979 handle SynUnif => (expError env (Unif ("substitution", eb));
adamc@11 980 cerror)
adamc@11 981 in
adamc@11 982 ((L'.ECApp (e', c'), loc), eb')
adamc@11 983 end
adamc@11 984
adamc@11 985 | L'.CUnif _ =>
adamc@11 986 (expError env (Unif ("application", et));
adamc@11 987 (eerror, cerror))
adamc@11 988
adamc@11 989 | _ =>
adamc@11 990 (expError env (WrongForm ("constructor function", e', et));
adamc@11 991 (eerror, cerror))
adamc@10 992 end
adamc@11 993 | L.ECAbs (expl, x, k, e) =>
adamc@11 994 let
adamc@11 995 val expl' = elabExplicitness expl
adamc@11 996 val k' = elabKind k
adamc@11 997 val (e', et) = elabExp (E.pushCRel env x k') e
adamc@11 998 in
adamc@11 999 ((L'.ECAbs (expl', x, k', e'), loc),
adamc@11 1000 (L'.TCFun (expl', x, k', et), loc))
adamc@11 1001 end
adamc@6 1002
adamc@12 1003 | L.ERecord xes =>
adamc@12 1004 let
adamc@12 1005 val xes' = map (fn (x, e) =>
adamc@12 1006 let
adamc@12 1007 val (x', xk) = elabCon env x
adamc@12 1008 val (e', et) = elabExp env e
adamc@12 1009 in
adamc@12 1010 checkKind env x' xk kname;
adamc@12 1011 (x', e', et)
adamc@12 1012 end) xes
adamc@12 1013 in
adamc@29 1014 ((L'.ERecord xes', loc),
adamc@12 1015 (L'.TRecord (L'.CRecord (ktype, map (fn (x', _, et) => (x', et)) xes'), loc), loc))
adamc@12 1016 end
adamc@12 1017
adamc@12 1018 | L.EField (e, c) =>
adamc@12 1019 let
adamc@12 1020 val (e', et) = elabExp env e
adamc@12 1021 val (c', ck) = elabCon env c
adamc@12 1022
adamc@12 1023 val ft = cunif ktype
adamc@12 1024 val rest = cunif ktype_record
adamc@12 1025 in
adamc@12 1026 checkKind env c' ck kname;
adamc@12 1027 checkCon env e' et (L'.TRecord (L'.CConcat ((L'.CRecord (ktype, [(c', ft)]), loc), rest), loc), loc);
adamc@12 1028 ((L'.EField (e', c', {field = ft, rest = rest}), loc), ft)
adamc@12 1029 end
adamc@71 1030
adamc@71 1031 | L.EFold =>
adamc@71 1032 let
adamc@71 1033 val dom = kunif ()
adamc@71 1034 in
adamc@71 1035 ((L'.EFold dom, loc), foldType (dom, loc))
adamc@71 1036 end
adamc@12 1037
adamc@12 1038
adamc@6 1039 datatype decl_error =
adamc@6 1040 KunifsRemainKind of ErrorMsg.span * L'.kind
adamc@6 1041 | KunifsRemainCon of ErrorMsg.span * L'.con
adamc@10 1042 | KunifsRemainExp of ErrorMsg.span * L'.exp
adamc@10 1043 | CunifsRemainCon of ErrorMsg.span * L'.con
adamc@10 1044 | CunifsRemainExp of ErrorMsg.span * L'.exp
adamc@6 1045
adamc@6 1046 fun declError env err =
adamc@6 1047 case err of
adamc@6 1048 KunifsRemainKind (loc, k) =>
adamc@6 1049 (ErrorMsg.errorAt loc "Some kind unification variables are undetermined in kind";
adamc@6 1050 eprefaces' [("Kind", p_kind k)])
adamc@6 1051 | KunifsRemainCon (loc, c) =>
adamc@6 1052 (ErrorMsg.errorAt loc "Some kind unification variables are undetermined in constructor";
adamc@6 1053 eprefaces' [("Constructor", p_con env c)])
adamc@10 1054 | KunifsRemainExp (loc, e) =>
adamc@10 1055 (ErrorMsg.errorAt loc "Some kind unification variables are undetermined in expression";
adamc@10 1056 eprefaces' [("Expression", p_exp env e)])
adamc@10 1057 | CunifsRemainCon (loc, c) =>
adamc@10 1058 (ErrorMsg.errorAt loc "Some constructor unification variables are undetermined in constructor";
adamc@10 1059 eprefaces' [("Constructor", p_con env c)])
adamc@10 1060 | CunifsRemainExp (loc, e) =>
adamc@10 1061 (ErrorMsg.errorAt loc "Some constructor unification variables are undetermined in expression";
adamc@10 1062 eprefaces' [("Expression", p_exp env e)])
adamc@6 1063
adamc@31 1064 datatype sgn_error =
adamc@31 1065 UnboundSgn of ErrorMsg.span * string
adamc@31 1066 | UnmatchedSgi of L'.sgn_item
adamc@31 1067 | SgiWrongKind of L'.sgn_item * L'.kind * L'.sgn_item * L'.kind * kunify_error
adamc@31 1068 | SgiWrongCon of L'.sgn_item * L'.con * L'.sgn_item * L'.con * cunify_error
adamc@41 1069 | SgnWrongForm of L'.sgn * L'.sgn
adamc@42 1070 | UnWhereable of L'.sgn * string
adamc@58 1071 | NotIncludable of L'.sgn
adamc@62 1072 | DuplicateCon of ErrorMsg.span * string
adamc@62 1073 | DuplicateVal of ErrorMsg.span * string
adamc@62 1074 | DuplicateSgn of ErrorMsg.span * string
adamc@62 1075 | DuplicateStr of ErrorMsg.span * string
adamc@31 1076
adamc@31 1077 fun sgnError env err =
adamc@31 1078 case err of
adamc@31 1079 UnboundSgn (loc, s) =>
adamc@31 1080 ErrorMsg.errorAt loc ("Unbound signature variable " ^ s)
adamc@31 1081 | UnmatchedSgi (sgi as (_, loc)) =>
adamc@31 1082 (ErrorMsg.errorAt loc "Unmatched signature item";
adamc@31 1083 eprefaces' [("Item", p_sgn_item env sgi)])
adamc@31 1084 | SgiWrongKind (sgi1, k1, sgi2, k2, kerr) =>
adamc@31 1085 (ErrorMsg.errorAt (#2 sgi1) "Kind unification failure in signature matching:";
adamc@59 1086 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59 1087 ("Need", p_sgn_item env sgi2),
adamc@31 1088 ("Kind 1", p_kind k1),
adamc@31 1089 ("Kind 2", p_kind k2)];
adamc@31 1090 kunifyError kerr)
adamc@31 1091 | SgiWrongCon (sgi1, c1, sgi2, c2, cerr) =>
adamc@31 1092 (ErrorMsg.errorAt (#2 sgi1) "Constructor unification failure in signature matching:";
adamc@59 1093 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59 1094 ("Need", p_sgn_item env sgi2),
adamc@31 1095 ("Con 1", p_con env c1),
adamc@31 1096 ("Con 2", p_con env c2)];
adamc@31 1097 cunifyError env cerr)
adamc@41 1098 | SgnWrongForm (sgn1, sgn2) =>
adamc@41 1099 (ErrorMsg.errorAt (#2 sgn1) "Incompatible signatures:";
adamc@41 1100 eprefaces' [("Sig 1", p_sgn env sgn1),
adamc@41 1101 ("Sig 2", p_sgn env sgn2)])
adamc@42 1102 | UnWhereable (sgn, x) =>
adamc@42 1103 (ErrorMsg.errorAt (#2 sgn) "Unavailable field for 'where'";
adamc@42 1104 eprefaces' [("Signature", p_sgn env sgn),
adamc@42 1105 ("Field", PD.string x)])
adamc@58 1106 | NotIncludable sgn =>
adamc@58 1107 (ErrorMsg.errorAt (#2 sgn) "Invalid signature to 'include'";
adamc@58 1108 eprefaces' [("Signature", p_sgn env sgn)])
adamc@62 1109 | DuplicateCon (loc, s) =>
adamc@62 1110 ErrorMsg.errorAt loc ("Duplicate constructor " ^ s ^ " in signature")
adamc@62 1111 | DuplicateVal (loc, s) =>
adamc@62 1112 ErrorMsg.errorAt loc ("Duplicate value " ^ s ^ " in signature")
adamc@62 1113 | DuplicateSgn (loc, s) =>
adamc@62 1114 ErrorMsg.errorAt loc ("Duplicate signature " ^ s ^ " in signature")
adamc@62 1115 | DuplicateStr (loc, s) =>
adamc@62 1116 ErrorMsg.errorAt loc ("Duplicate structure " ^ s ^ " in signature")
adamc@31 1117
adamc@31 1118 datatype str_error =
adamc@31 1119 UnboundStr of ErrorMsg.span * string
adamc@44 1120 | NotFunctor of L'.sgn
adamc@46 1121 | FunctorRebind of ErrorMsg.span
adamc@61 1122 | UnOpenable of L'.sgn
adamc@31 1123
adamc@31 1124 fun strError env err =
adamc@31 1125 case err of
adamc@31 1126 UnboundStr (loc, s) =>
adamc@31 1127 ErrorMsg.errorAt loc ("Unbound structure variable " ^ s)
adamc@44 1128 | NotFunctor sgn =>
adamc@44 1129 (ErrorMsg.errorAt (#2 sgn) "Application of non-functor";
adamc@44 1130 eprefaces' [("Signature", p_sgn env sgn)])
adamc@46 1131 | FunctorRebind loc =>
adamc@46 1132 ErrorMsg.errorAt loc "Attempt to rebind functor"
adamc@61 1133 | UnOpenable sgn =>
adamc@61 1134 (ErrorMsg.errorAt (#2 sgn) "Un-openable structure";
adamc@61 1135 eprefaces' [("Signature", p_sgn env sgn)])
adamc@31 1136
adamc@42 1137 val hnormSgn = E.hnormSgn
adamc@31 1138
adamc@31 1139 fun elabSgn_item ((sgi, loc), env) =
adamc@31 1140 let
adamc@31 1141
adamc@31 1142 in
adamc@31 1143 resetKunif ();
adamc@31 1144 resetCunif ();
adamc@31 1145 case sgi of
adamc@31 1146 L.SgiConAbs (x, k) =>
adamc@31 1147 let
adamc@31 1148 val k' = elabKind k
adamc@31 1149
adamc@31 1150 val (env', n) = E.pushCNamed env x k' NONE
adamc@31 1151 in
adamc@31 1152 if ErrorMsg.anyErrors () then
adamc@31 1153 ()
adamc@31 1154 else (
adamc@31 1155 if kunifsInKind k' then
adamc@31 1156 declError env (KunifsRemainKind (loc, k'))
adamc@31 1157 else
adamc@31 1158 ()
adamc@31 1159 );
adamc@31 1160
adamc@58 1161 ([(L'.SgiConAbs (x, n, k'), loc)], env')
adamc@31 1162 end
adamc@31 1163
adamc@31 1164 | L.SgiCon (x, ko, c) =>
adamc@31 1165 let
adamc@31 1166 val k' = case ko of
adamc@31 1167 NONE => kunif ()
adamc@31 1168 | SOME k => elabKind k
adamc@31 1169
adamc@31 1170 val (c', ck) = elabCon env c
adamc@31 1171 val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@31 1172 in
adamc@31 1173 checkKind env c' ck k';
adamc@31 1174
adamc@31 1175 if ErrorMsg.anyErrors () then
adamc@31 1176 ()
adamc@31 1177 else (
adamc@31 1178 if kunifsInKind k' then
adamc@31 1179 declError env (KunifsRemainKind (loc, k'))
adamc@31 1180 else
adamc@31 1181 ();
adamc@31 1182
adamc@31 1183 if kunifsInCon c' then
adamc@31 1184 declError env (KunifsRemainCon (loc, c'))
adamc@31 1185 else
adamc@31 1186 ()
adamc@31 1187 );
adamc@31 1188
adamc@58 1189 ([(L'.SgiCon (x, n, k', c'), loc)], env')
adamc@31 1190 end
adamc@31 1191
adamc@31 1192 | L.SgiVal (x, c) =>
adamc@31 1193 let
adamc@31 1194 val (c', ck) = elabCon env c
adamc@31 1195
adamc@31 1196 val (env', n) = E.pushENamed env x c'
adamc@31 1197 in
adamc@31 1198 unifyKinds ck ktype;
adamc@31 1199
adamc@31 1200 if ErrorMsg.anyErrors () then
adamc@31 1201 ()
adamc@31 1202 else (
adamc@31 1203 if kunifsInCon c' then
adamc@31 1204 declError env (KunifsRemainCon (loc, c'))
adamc@31 1205 else
adamc@31 1206 ()
adamc@31 1207 );
adamc@31 1208
adamc@58 1209 ([(L'.SgiVal (x, n, c'), loc)], env')
adamc@31 1210 end
adamc@31 1211
adamc@31 1212 | L.SgiStr (x, sgn) =>
adamc@31 1213 let
adamc@31 1214 val sgn' = elabSgn env sgn
adamc@31 1215 val (env', n) = E.pushStrNamed env x sgn'
adamc@31 1216 in
adamc@58 1217 ([(L'.SgiStr (x, n, sgn'), loc)], env')
adamc@31 1218 end
adamc@58 1219
adamc@59 1220 | L.SgiSgn (x, sgn) =>
adamc@59 1221 let
adamc@59 1222 val sgn' = elabSgn env sgn
adamc@59 1223 val (env', n) = E.pushSgnNamed env x sgn'
adamc@59 1224 in
adamc@59 1225 ([(L'.SgiSgn (x, n, sgn'), loc)], env')
adamc@59 1226 end
adamc@59 1227
adamc@58 1228 | L.SgiInclude sgn =>
adamc@58 1229 let
adamc@58 1230 val sgn' = elabSgn env sgn
adamc@58 1231 in
adamc@58 1232 case #1 (hnormSgn env sgn') of
adamc@58 1233 L'.SgnConst sgis =>
adamc@58 1234 (sgis, foldl (fn (sgi, env) => E.sgiBinds env sgi) env sgis)
adamc@58 1235 | _ => (sgnError env (NotIncludable sgn');
adamc@58 1236 ([], env))
adamc@58 1237 end
adamc@59 1238
adamc@31 1239 end
adamc@31 1240
adamc@31 1241 and elabSgn env (sgn, loc) =
adamc@31 1242 case sgn of
adamc@31 1243 L.SgnConst sgis =>
adamc@31 1244 let
adamc@58 1245 val (sgis', _) = ListUtil.foldlMapConcat elabSgn_item env sgis
adamc@62 1246
adamc@62 1247 val _ = foldl (fn ((sgi, loc), (cons, vals, sgns, strs)) =>
adamc@62 1248 case sgi of
adamc@62 1249 L'.SgiConAbs (x, _, _) =>
adamc@62 1250 (if SS.member (cons, x) then
adamc@62 1251 sgnError env (DuplicateCon (loc, x))
adamc@62 1252 else
adamc@62 1253 ();
adamc@62 1254 (SS.add (cons, x), vals, sgns, strs))
adamc@62 1255 | L'.SgiCon (x, _, _, _) =>
adamc@62 1256 (if SS.member (cons, x) then
adamc@62 1257 sgnError env (DuplicateCon (loc, x))
adamc@62 1258 else
adamc@62 1259 ();
adamc@62 1260 (SS.add (cons, x), vals, sgns, strs))
adamc@62 1261 | L'.SgiVal (x, _, _) =>
adamc@62 1262 (if SS.member (vals, x) then
adamc@62 1263 sgnError env (DuplicateVal (loc, x))
adamc@62 1264 else
adamc@62 1265 ();
adamc@62 1266 (cons, SS.add (vals, x), sgns, strs))
adamc@62 1267 | L'.SgiSgn (x, _, _) =>
adamc@62 1268 (if SS.member (sgns, x) then
adamc@62 1269 sgnError env (DuplicateSgn (loc, x))
adamc@62 1270 else
adamc@62 1271 ();
adamc@62 1272 (cons, vals, SS.add (sgns, x), strs))
adamc@62 1273 | L'.SgiStr (x, _, _) =>
adamc@62 1274 (if SS.member (strs, x) then
adamc@62 1275 sgnError env (DuplicateStr (loc, x))
adamc@62 1276 else
adamc@62 1277 ();
adamc@62 1278 (cons, vals, sgns, SS.add (strs, x))))
adamc@62 1279 (SS.empty, SS.empty, SS.empty, SS.empty) sgis'
adamc@31 1280 in
adamc@31 1281 (L'.SgnConst sgis', loc)
adamc@31 1282 end
adamc@31 1283 | L.SgnVar x =>
adamc@31 1284 (case E.lookupSgn env x of
adamc@31 1285 NONE =>
adamc@31 1286 (sgnError env (UnboundSgn (loc, x));
adamc@31 1287 (L'.SgnError, loc))
adamc@31 1288 | SOME (n, sgis) => (L'.SgnVar n, loc))
adamc@41 1289 | L.SgnFun (m, dom, ran) =>
adamc@41 1290 let
adamc@41 1291 val dom' = elabSgn env dom
adamc@41 1292 val (env', n) = E.pushStrNamed env m dom'
adamc@41 1293 val ran' = elabSgn env' ran
adamc@41 1294 in
adamc@41 1295 (L'.SgnFun (m, n, dom', ran'), loc)
adamc@41 1296 end
adamc@42 1297 | L.SgnWhere (sgn, x, c) =>
adamc@42 1298 let
adamc@42 1299 val sgn' = elabSgn env sgn
adamc@42 1300 val (c', ck) = elabCon env c
adamc@42 1301 in
adamc@42 1302 case #1 (hnormSgn env sgn') of
adamc@42 1303 L'.SgnError => sgnerror
adamc@42 1304 | L'.SgnConst sgis =>
adamc@42 1305 if List.exists (fn (L'.SgiConAbs (x, _, k), _) =>
adamc@42 1306 (unifyKinds k ck;
adamc@42 1307 true)
adamc@42 1308 | _ => false) sgis then
adamc@42 1309 (L'.SgnWhere (sgn', x, c'), loc)
adamc@42 1310 else
adamc@42 1311 (sgnError env (UnWhereable (sgn', x));
adamc@42 1312 sgnerror)
adamc@42 1313 | _ => (sgnError env (UnWhereable (sgn', x));
adamc@42 1314 sgnerror)
adamc@42 1315 end
adamc@59 1316 | L.SgnProj (m, ms, x) =>
adamc@59 1317 (case E.lookupStr env m of
adamc@59 1318 NONE => (strError env (UnboundStr (loc, m));
adamc@59 1319 sgnerror)
adamc@59 1320 | SOME (n, sgn) =>
adamc@59 1321 let
adamc@59 1322 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@59 1323 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@59 1324 NONE => (strError env (UnboundStr (loc, m));
adamc@59 1325 (strerror, sgnerror))
adamc@59 1326 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@59 1327 ((L'.StrVar n, loc), sgn) ms
adamc@59 1328 in
adamc@59 1329 case E.projectSgn env {sgn = sgn, str = str, field = x} of
adamc@59 1330 NONE => (sgnError env (UnboundSgn (loc, x));
adamc@59 1331 sgnerror)
adamc@59 1332 | SOME _ => (L'.SgnProj (n, ms, x), loc)
adamc@59 1333 end)
adamc@59 1334
adamc@31 1335
adamc@66 1336 fun selfify env {str, strs, sgn} =
adamc@66 1337 case #1 (hnormSgn env sgn) of
adamc@66 1338 L'.SgnError => sgn
adamc@66 1339 | L'.SgnVar _ => sgn
adamc@66 1340
adamc@66 1341 | L'.SgnConst sgis =>
adamc@66 1342 (L'.SgnConst (map (fn (L'.SgiConAbs (x, n, k), loc) =>
adamc@66 1343 (L'.SgiCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc)
adamc@66 1344 | (L'.SgiStr (x, n, sgn), loc) =>
adamc@66 1345 (L'.SgiStr (x, n, selfify env {str = str, strs = strs @ [x], sgn = sgn}), loc)
adamc@66 1346 | x => x) sgis), #2 sgn)
adamc@66 1347 | L'.SgnFun _ => sgn
adamc@66 1348 | L'.SgnWhere _ => sgn
adamc@66 1349 | L'.SgnProj (m, ms, x) =>
adamc@66 1350 case E.projectSgn env {str = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66 1351 (L'.StrVar m, #2 sgn) ms,
adamc@66 1352 sgn = #2 (E.lookupStrNamed env m),
adamc@66 1353 field = x} of
adamc@66 1354 NONE => raise Fail "Elaborate.selfify: projectSgn returns NONE"
adamc@66 1355 | SOME sgn => selfify env {str = str, strs = strs, sgn = sgn}
adamc@66 1356
adamc@66 1357 fun selfifyAt env {str, sgn} =
adamc@66 1358 let
adamc@66 1359 fun self (str, _) =
adamc@66 1360 case str of
adamc@66 1361 L'.StrVar x => SOME (x, [])
adamc@66 1362 | L'.StrProj (str, x) =>
adamc@66 1363 (case self str of
adamc@66 1364 NONE => NONE
adamc@66 1365 | SOME (m, ms) => SOME (m, ms @ [x]))
adamc@66 1366 | _ => NONE
adamc@66 1367 in
adamc@66 1368 case self str of
adamc@66 1369 NONE => sgn
adamc@66 1370 | SOME (str, strs) => selfify env {sgn = sgn, str = str, strs = strs}
adamc@66 1371 end
adamc@66 1372
adamc@66 1373 fun dopen env {str, strs, sgn} =
adamc@66 1374 let
adamc@66 1375 val m = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66 1376 (L'.StrVar str, #2 sgn) strs
adamc@66 1377 in
adamc@66 1378 case #1 (hnormSgn env sgn) of
adamc@66 1379 L'.SgnConst sgis =>
adamc@66 1380 ListUtil.foldlMap (fn ((sgi, loc), env') =>
adamc@66 1381 case sgi of
adamc@66 1382 L'.SgiConAbs (x, n, k) =>
adamc@66 1383 ((L'.DCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc),
adamc@66 1384 E.pushCNamedAs env' x n k NONE)
adamc@66 1385 | L'.SgiCon (x, n, k, c) =>
adamc@66 1386 ((L'.DCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc),
adamc@66 1387 E.pushCNamedAs env' x n k (SOME c))
adamc@66 1388 | L'.SgiVal (x, n, t) =>
adamc@66 1389 ((L'.DVal (x, n, t, (L'.EModProj (str, strs, x), loc)), loc),
adamc@66 1390 E.pushENamedAs env' x n t)
adamc@66 1391 | L'.SgiStr (x, n, sgn) =>
adamc@66 1392 ((L'.DStr (x, n, sgn, (L'.StrProj (m, x), loc)), loc),
adamc@66 1393 E.pushStrNamedAs env' x n sgn)
adamc@66 1394 | L'.SgiSgn (x, n, sgn) =>
adamc@66 1395 ((L'.DSgn (x, n, (L'.SgnProj (str, strs, x), loc)), loc),
adamc@66 1396 E.pushSgnNamedAs env' x n sgn))
adamc@66 1397 env sgis
adamc@66 1398 | _ => (strError env (UnOpenable sgn);
adamc@66 1399 ([], env))
adamc@66 1400 end
adamc@66 1401
adamc@31 1402 fun sgiOfDecl (d, loc) =
adamc@31 1403 case d of
adamc@59 1404 L'.DCon (x, n, k, c) => (L'.SgiCon (x, n, k, c), loc)
adamc@59 1405 | L'.DVal (x, n, t, _) => (L'.SgiVal (x, n, t), loc)
adamc@59 1406 | L'.DSgn (x, n, sgn) => (L'.SgiSgn (x, n, sgn), loc)
adamc@59 1407 | L'.DStr (x, n, sgn, _) => (L'.SgiStr (x, n, sgn), loc)
adamc@59 1408 | L'.DFfiStr (x, n, sgn) => (L'.SgiStr (x, n, sgn), loc)
adamc@31 1409
adamc@35 1410 fun subSgn env sgn1 (sgn2 as (_, loc2)) =
adamc@35 1411 case (#1 (hnormSgn env sgn1), #1 (hnormSgn env sgn2)) of
adamc@31 1412 (L'.SgnError, _) => ()
adamc@31 1413 | (_, L'.SgnError) => ()
adamc@31 1414
adamc@31 1415 | (L'.SgnConst sgis1, L'.SgnConst sgis2) =>
adamc@31 1416 let
adamc@31 1417 fun folder (sgi2All as (sgi, _), env) =
adamc@31 1418 let
adamc@31 1419 fun seek p =
adamc@31 1420 let
adamc@31 1421 fun seek env ls =
adamc@31 1422 case ls of
adamc@31 1423 [] => (sgnError env (UnmatchedSgi sgi2All);
adamc@31 1424 env)
adamc@31 1425 | h :: t =>
adamc@31 1426 case p h of
adamc@31 1427 NONE => seek (E.sgiBinds env h) t
adamc@31 1428 | SOME env => env
adamc@31 1429 in
adamc@31 1430 seek env sgis1
adamc@31 1431 end
adamc@31 1432 in
adamc@31 1433 case sgi of
adamc@31 1434 L'.SgiConAbs (x, n2, k2) =>
adamc@31 1435 seek (fn sgi1All as (sgi1, _) =>
adamc@31 1436 let
adamc@41 1437 fun found (x', n1, k1, co1) =
adamc@41 1438 if x = x' then
adamc@41 1439 let
adamc@41 1440 val () = unifyKinds k1 k2
adamc@41 1441 handle KUnify (k1, k2, err) =>
adamc@41 1442 sgnError env (SgiWrongKind (sgi1All, k1, sgi2All, k2, err))
adamc@41 1443 val env = E.pushCNamedAs env x n1 k1 co1
adamc@41 1444 in
adamc@41 1445 SOME (if n1 = n2 then
adamc@41 1446 env
adamc@41 1447 else
adamc@41 1448 E.pushCNamedAs env x n2 k2 (SOME (L'.CNamed n1, loc2)))
adamc@41 1449 end
adamc@41 1450 else
adamc@41 1451 NONE
adamc@31 1452 in
adamc@31 1453 case sgi1 of
adamc@41 1454 L'.SgiConAbs (x', n1, k1) => found (x', n1, k1, NONE)
adamc@41 1455 | L'.SgiCon (x', n1, k1, c1) => found (x', n1, k1, SOME c1)
adamc@31 1456 | _ => NONE
adamc@31 1457 end)
adamc@31 1458
adamc@31 1459 | L'.SgiCon (x, n2, k2, c2) =>
adamc@31 1460 seek (fn sgi1All as (sgi1, _) =>
adamc@31 1461 case sgi1 of
adamc@41 1462 L'.SgiCon (x', n1, k1, c1) =>
adamc@41 1463 if x = x' then
adamc@41 1464 let
adamc@41 1465 val () = unifyCons env c1 c2
adamc@41 1466 handle CUnify (c1, c2, err) =>
adamc@41 1467 sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err))
adamc@41 1468 in
adamc@41 1469 SOME (E.pushCNamedAs env x n2 k2 (SOME c2))
adamc@41 1470 end
adamc@41 1471 else
adamc@41 1472 NONE
adamc@31 1473 | _ => NONE)
adamc@31 1474
adamc@32 1475 | L'.SgiVal (x, n2, c2) =>
adamc@32 1476 seek (fn sgi1All as (sgi1, _) =>
adamc@32 1477 case sgi1 of
adamc@41 1478 L'.SgiVal (x', n1, c1) =>
adamc@41 1479 if x = x' then
adamc@41 1480 let
adamc@41 1481 val () = unifyCons env c1 c2
adamc@41 1482 handle CUnify (c1, c2, err) =>
adamc@41 1483 sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err))
adamc@41 1484 in
adamc@41 1485 SOME env
adamc@41 1486 end
adamc@41 1487 else
adamc@41 1488 NONE
adamc@32 1489 | _ => NONE)
adamc@32 1490
adamc@33 1491 | L'.SgiStr (x, n2, sgn2) =>
adamc@33 1492 seek (fn sgi1All as (sgi1, _) =>
adamc@33 1493 case sgi1 of
adamc@41 1494 L'.SgiStr (x', n1, sgn1) =>
adamc@41 1495 if x = x' then
adamc@66 1496 let
adamc@66 1497 val () = subSgn env sgn1 sgn2
adamc@66 1498 val env = E.pushStrNamedAs env x n1 sgn1
adamc@66 1499 val env = if n1 = n2 then
adamc@66 1500 env
adamc@66 1501 else
adamc@66 1502 E.pushStrNamedAs env x n2
adamc@66 1503 (selfifyAt env {str = (L'.StrVar n1, #2 sgn2),
adamc@66 1504 sgn = sgn2})
adamc@66 1505 in
adamc@66 1506 SOME env
adamc@66 1507 end
adamc@41 1508 else
adamc@41 1509 NONE
adamc@33 1510 | _ => NONE)
adamc@59 1511
adamc@59 1512 | L'.SgiSgn (x, n2, sgn2) =>
adamc@59 1513 seek (fn sgi1All as (sgi1, _) =>
adamc@59 1514 case sgi1 of
adamc@59 1515 L'.SgiSgn (x', n1, sgn1) =>
adamc@59 1516 if x = x' then
adamc@65 1517 let
adamc@65 1518 val () = subSgn env sgn1 sgn2
adamc@65 1519 val () = subSgn env sgn2 sgn1
adamc@65 1520
adamc@65 1521 val env = E.pushSgnNamedAs env x n2 sgn2
adamc@65 1522 val env = if n1 = n2 then
adamc@65 1523 env
adamc@65 1524 else
adamc@65 1525 E.pushSgnNamedAs env x n1 sgn2
adamc@65 1526 in
adamc@65 1527 SOME env
adamc@65 1528 end
adamc@59 1529 else
adamc@59 1530 NONE
adamc@59 1531 | _ => NONE)
adamc@31 1532 end
adamc@31 1533 in
adamc@31 1534 ignore (foldl folder env sgis2)
adamc@31 1535 end
adamc@31 1536
adamc@41 1537 | (L'.SgnFun (m1, n1, dom1, ran1), L'.SgnFun (m2, n2, dom2, ran2)) =>
adamc@43 1538 let
adamc@43 1539 val ran1 =
adamc@43 1540 if n1 = n2 then
adamc@43 1541 ran1
adamc@43 1542 else
adamc@43 1543 subStrInSgn (n1, n2) ran1
adamc@43 1544 in
adamc@43 1545 subSgn env dom2 dom1;
adamc@43 1546 subSgn (E.pushStrNamedAs env m2 n2 dom2) ran1 ran2
adamc@43 1547 end
adamc@41 1548
adamc@41 1549 | _ => sgnError env (SgnWrongForm (sgn1, sgn2))
adamc@41 1550
adamc@61 1551
adamc@31 1552 fun elabDecl ((d, loc), env) =
adamc@30 1553 let
adamc@30 1554
adamc@30 1555 in
adamc@30 1556 resetKunif ();
adamc@30 1557 resetCunif ();
adamc@30 1558 case d of
adamc@30 1559 L.DCon (x, ko, c) =>
adamc@30 1560 let
adamc@30 1561 val k' = case ko of
adamc@30 1562 NONE => kunif ()
adamc@30 1563 | SOME k => elabKind k
adamc@3 1564
adamc@30 1565 val (c', ck) = elabCon env c
adamc@30 1566 val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@30 1567 in
adamc@30 1568 checkKind env c' ck k';
adamc@6 1569
adamc@30 1570 if ErrorMsg.anyErrors () then
adamc@30 1571 ()
adamc@30 1572 else (
adamc@30 1573 if kunifsInKind k' then
adamc@30 1574 declError env (KunifsRemainKind (loc, k'))
adamc@30 1575 else
adamc@30 1576 ();
adamc@6 1577
adamc@30 1578 if kunifsInCon c' then
adamc@30 1579 declError env (KunifsRemainCon (loc, c'))
adamc@30 1580 else
adamc@30 1581 ()
adamc@30 1582 );
adamc@6 1583
adamc@61 1584 ([(L'.DCon (x, n, k', c'), loc)], env')
adamc@30 1585 end
adamc@30 1586 | L.DVal (x, co, e) =>
adamc@30 1587 let
adamc@30 1588 val (c', ck) = case co of
adamc@30 1589 NONE => (cunif ktype, ktype)
adamc@30 1590 | SOME c => elabCon env c
adamc@10 1591
adamc@30 1592 val (e', et) = elabExp env e
adamc@30 1593 val (env', n) = E.pushENamed env x c'
adamc@30 1594 in
adamc@30 1595 checkCon env e' et c';
adamc@10 1596
adamc@30 1597 if ErrorMsg.anyErrors () then
adamc@30 1598 ()
adamc@30 1599 else (
adamc@30 1600 if kunifsInCon c' then
adamc@30 1601 declError env (KunifsRemainCon (loc, c'))
adamc@30 1602 else
adamc@30 1603 ();
adamc@10 1604
adamc@30 1605 if cunifsInCon c' then
adamc@30 1606 declError env (CunifsRemainCon (loc, c'))
adamc@30 1607 else
adamc@30 1608 ();
adamc@10 1609
adamc@30 1610 if kunifsInExp e' then
adamc@30 1611 declError env (KunifsRemainExp (loc, e'))
adamc@30 1612 else
adamc@30 1613 ();
adamc@10 1614
adamc@30 1615 if cunifsInExp e' then
adamc@30 1616 declError env (CunifsRemainExp (loc, e'))
adamc@30 1617 else
adamc@30 1618 ());
adamc@10 1619
adamc@61 1620 ([(L'.DVal (x, n, c', e'), loc)], env')
adamc@30 1621 end
adamc@30 1622
adamc@31 1623 | L.DSgn (x, sgn) =>
adamc@31 1624 let
adamc@31 1625 val sgn' = elabSgn env sgn
adamc@31 1626 val (env', n) = E.pushSgnNamed env x sgn'
adamc@31 1627 in
adamc@61 1628 ([(L'.DSgn (x, n, sgn'), loc)], env')
adamc@31 1629 end
adamc@31 1630
adamc@31 1631 | L.DStr (x, sgno, str) =>
adamc@31 1632 let
adamc@31 1633 val formal = Option.map (elabSgn env) sgno
adamc@31 1634 val (str', actual) = elabStr env str
adamc@31 1635
adamc@31 1636 val sgn' = case formal of
adamc@44 1637 NONE => selfifyAt env {str = str', sgn = actual}
adamc@31 1638 | SOME formal =>
adamc@31 1639 (subSgn env actual formal;
adamc@31 1640 formal)
adamc@31 1641
adamc@31 1642 val (env', n) = E.pushStrNamed env x sgn'
adamc@31 1643 in
adamc@46 1644 case #1 (hnormSgn env sgn') of
adamc@46 1645 L'.SgnFun _ =>
adamc@46 1646 (case #1 str' of
adamc@46 1647 L'.StrFun _ => ()
adamc@46 1648 | _ => strError env (FunctorRebind loc))
adamc@46 1649 | _ => ();
adamc@46 1650
adamc@61 1651 ([(L'.DStr (x, n, sgn', str'), loc)], env')
adamc@31 1652 end
adamc@48 1653
adamc@48 1654 | L.DFfiStr (x, sgn) =>
adamc@48 1655 let
adamc@48 1656 val sgn' = elabSgn env sgn
adamc@48 1657
adamc@48 1658 val (env', n) = E.pushStrNamed env x sgn'
adamc@48 1659 in
adamc@61 1660 ([(L'.DFfiStr (x, n, sgn'), loc)], env')
adamc@48 1661 end
adamc@61 1662
adamc@61 1663 | L.DOpen (m, ms) =>
adamc@61 1664 (case E.lookupStr env m of
adamc@61 1665 NONE => (strError env (UnboundStr (loc, m));
adamc@61 1666 ([], env))
adamc@61 1667 | SOME (n, sgn) =>
adamc@61 1668 let
adamc@61 1669 val (_, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@61 1670 case E.projectStr env {str = str, sgn = sgn, field = m} of
adamc@61 1671 NONE => (strError env (UnboundStr (loc, m));
adamc@61 1672 (strerror, sgnerror))
adamc@61 1673 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@61 1674 ((L'.StrVar n, loc), sgn) ms
adamc@61 1675 in
adamc@61 1676 dopen env {str = n, strs = ms, sgn = sgn}
adamc@61 1677 end)
adamc@30 1678 end
adamc@3 1679
adamc@31 1680 and elabStr env (str, loc) =
adamc@31 1681 case str of
adamc@31 1682 L.StrConst ds =>
adamc@31 1683 let
adamc@61 1684 val (ds', env') = ListUtil.foldlMapConcat elabDecl env ds
adamc@59 1685 val sgis = map sgiOfDecl ds'
adamc@63 1686
adamc@63 1687 val (sgis, _, _, _, _) =
adamc@64 1688 foldr (fn ((sgi, loc), (sgis, cons, vals, sgns, strs)) =>
adamc@63 1689 case sgi of
adamc@64 1690 L'.SgiConAbs (x, n, k) =>
adamc@64 1691 let
adamc@64 1692 val (cons, x) =
adamc@64 1693 if SS.member (cons, x) then
adamc@64 1694 (cons, "?" ^ x)
adamc@64 1695 else
adamc@64 1696 (SS.add (cons, x), x)
adamc@64 1697 in
adamc@64 1698 ((L'.SgiConAbs (x, n, k), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 1699 end
adamc@64 1700 | L'.SgiCon (x, n, k, c) =>
adamc@64 1701 let
adamc@64 1702 val (cons, x) =
adamc@64 1703 if SS.member (cons, x) then
adamc@64 1704 (cons, "?" ^ x)
adamc@64 1705 else
adamc@64 1706 (SS.add (cons, x), x)
adamc@64 1707 in
adamc@64 1708 ((L'.SgiCon (x, n, k, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 1709 end
adamc@64 1710 | L'.SgiVal (x, n, c) =>
adamc@64 1711 let
adamc@64 1712 val (vals, x) =
adamc@64 1713 if SS.member (vals, x) then
adamc@64 1714 (vals, "?" ^ x)
adamc@64 1715 else
adamc@64 1716 (SS.add (vals, x), x)
adamc@64 1717 in
adamc@64 1718 ((L'.SgiVal (x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 1719 end
adamc@64 1720 | L'.SgiSgn (x, n, sgn) =>
adamc@64 1721 let
adamc@64 1722 val (sgns, x) =
adamc@64 1723 if SS.member (sgns, x) then
adamc@64 1724 (sgns, "?" ^ x)
adamc@64 1725 else
adamc@64 1726 (SS.add (sgns, x), x)
adamc@64 1727 in
adamc@64 1728 ((L'.SgiSgn (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 1729 end
adamc@64 1730
adamc@64 1731 | L'.SgiStr (x, n, sgn) =>
adamc@64 1732 let
adamc@64 1733 val (strs, x) =
adamc@64 1734 if SS.member (strs, x) then
adamc@64 1735 (strs, "?" ^ x)
adamc@64 1736 else
adamc@64 1737 (SS.add (strs, x), x)
adamc@64 1738 in
adamc@64 1739 ((L'.SgiStr (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 1740 end)
adamc@64 1741
adamc@63 1742 ([], SS.empty, SS.empty, SS.empty, SS.empty) sgis
adamc@31 1743 in
adamc@31 1744 ((L'.StrConst ds', loc), (L'.SgnConst sgis, loc))
adamc@31 1745 end
adamc@31 1746 | L.StrVar x =>
adamc@31 1747 (case E.lookupStr env x of
adamc@31 1748 NONE =>
adamc@31 1749 (strError env (UnboundStr (loc, x));
adamc@31 1750 (strerror, sgnerror))
adamc@31 1751 | SOME (n, sgn) => ((L'.StrVar n, loc), sgn))
adamc@34 1752 | L.StrProj (str, x) =>
adamc@34 1753 let
adamc@34 1754 val (str', sgn) = elabStr env str
adamc@34 1755 in
adamc@34 1756 case E.projectStr env {str = str', sgn = sgn, field = x} of
adamc@34 1757 NONE => (strError env (UnboundStr (loc, x));
adamc@34 1758 (strerror, sgnerror))
adamc@34 1759 | SOME sgn => ((L'.StrProj (str', x), loc), sgn)
adamc@34 1760 end
adamc@41 1761 | L.StrFun (m, dom, ranO, str) =>
adamc@41 1762 let
adamc@41 1763 val dom' = elabSgn env dom
adamc@41 1764 val (env', n) = E.pushStrNamed env m dom'
adamc@41 1765 val (str', actual) = elabStr env' str
adamc@41 1766
adamc@41 1767 val formal =
adamc@41 1768 case ranO of
adamc@41 1769 NONE => actual
adamc@41 1770 | SOME ran =>
adamc@41 1771 let
adamc@42 1772 val ran' = elabSgn env' ran
adamc@41 1773 in
adamc@41 1774 subSgn env' actual ran';
adamc@41 1775 ran'
adamc@41 1776 end
adamc@41 1777 in
adamc@41 1778 ((L'.StrFun (m, n, dom', formal, str'), loc),
adamc@41 1779 (L'.SgnFun (m, n, dom', formal), loc))
adamc@41 1780 end
adamc@44 1781 | L.StrApp (str1, str2) =>
adamc@44 1782 let
adamc@44 1783 val (str1', sgn1) = elabStr env str1
adamc@44 1784 val (str2', sgn2) = elabStr env str2
adamc@44 1785 in
adamc@44 1786 case #1 (hnormSgn env sgn1) of
adamc@44 1787 L'.SgnError => (strerror, sgnerror)
adamc@44 1788 | L'.SgnFun (m, n, dom, ran) =>
adamc@44 1789 (subSgn env sgn2 dom;
adamc@44 1790 case #1 (hnormSgn env ran) of
adamc@44 1791 L'.SgnError => (strerror, sgnerror)
adamc@44 1792 | L'.SgnConst sgis =>
adamc@44 1793 ((L'.StrApp (str1', str2'), loc),
adamc@44 1794 (L'.SgnConst ((L'.SgiStr (m, n, selfifyAt env {str = str2', sgn = sgn2}), loc) :: sgis), loc))
adamc@44 1795 | _ => raise Fail "Unable to hnormSgn in functor application")
adamc@44 1796 | _ => (strError env (NotFunctor sgn1);
adamc@44 1797 (strerror, sgnerror))
adamc@44 1798 end
adamc@31 1799
adamc@56 1800 fun elabFile basis env file =
adamc@56 1801 let
adamc@56 1802 val sgn = elabSgn env (L.SgnConst basis, ErrorMsg.dummySpan)
adamc@56 1803 val (env', basis_n) = E.pushStrNamed env "Basis" sgn
adamc@56 1804
adamc@61 1805 val (ds, env') = dopen env' {str = basis_n, strs = [], sgn = sgn}
adamc@56 1806
adamc@56 1807 fun discoverC r x =
adamc@56 1808 case E.lookupC env' x of
adamc@56 1809 E.NotBound => raise Fail ("Constructor " ^ x ^ " unbound in Basis")
adamc@56 1810 | E.Rel _ => raise Fail ("Constructor " ^ x ^ " bound relatively in Basis")
adamc@56 1811 | E.Named (n, (_, loc)) => r := (L'.CNamed n, loc)
adamc@56 1812
adamc@56 1813 val () = discoverC int "int"
adamc@56 1814 val () = discoverC float "float"
adamc@56 1815 val () = discoverC string "string"
adamc@56 1816
adamc@61 1817 val (file, _) = ListUtil.foldlMapConcat elabDecl env' file
adamc@56 1818 in
adamc@56 1819 (L'.DFfiStr ("Basis", basis_n, sgn), ErrorMsg.dummySpan) :: ds @ file
adamc@56 1820 end
adamc@2 1821
adamc@2 1822 end