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annotate src/elaborate.sml @ 198:ab86aa858e6c

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'Option' datatype encoding
author Adam Chlipala <adamc@hcoop.net>
date Sat, 09 Aug 2008 19:23:31 -0400
parents df5fd8f6913a
children dd82457fda82
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@2 50 fun elabExplicitness e =
adamc@2 51 case e of
adamc@2 52 L.Explicit => L'.Explicit
adamc@2 53 | L.Implicit => L'.Implicit
adamc@2 54
adamc@2 55 fun occursKind r =
adamc@76 56 U.Kind.exists (fn L'.KUnif (_, _, r') => r = r'
adamc@2 57 | _ => false)
adamc@2 58
adamc@3 59 datatype kunify_error =
adamc@2 60 KOccursCheckFailed of L'.kind * L'.kind
adamc@2 61 | KIncompatible of L'.kind * L'.kind
adamc@2 62
adamc@3 63 exception KUnify' of kunify_error
adamc@3 64
adamc@3 65 fun kunifyError err =
adamc@2 66 case err of
adamc@2 67 KOccursCheckFailed (k1, k2) =>
adamc@3 68 eprefaces "Kind occurs check failed"
adamc@3 69 [("Kind 1", p_kind k1),
adamc@3 70 ("Kind 2", p_kind k2)]
adamc@2 71 | KIncompatible (k1, k2) =>
adamc@3 72 eprefaces "Incompatible kinds"
adamc@3 73 [("Kind 1", p_kind k1),
adamc@3 74 ("Kind 2", p_kind k2)]
adamc@2 75
adamc@3 76 fun unifyKinds' (k1All as (k1, _)) (k2All as (k2, _)) =
adamc@2 77 let
adamc@3 78 fun err f = raise KUnify' (f (k1All, k2All))
adamc@2 79 in
adamc@2 80 case (k1, k2) of
adamc@2 81 (L'.KType, L'.KType) => ()
adamc@82 82 | (L'.KUnit, L'.KUnit) => ()
adamc@82 83
adamc@2 84 | (L'.KArrow (d1, r1), L'.KArrow (d2, r2)) =>
adamc@3 85 (unifyKinds' d1 d2;
adamc@3 86 unifyKinds' r1 r2)
adamc@2 87 | (L'.KName, L'.KName) => ()
adamc@3 88 | (L'.KRecord k1, L'.KRecord k2) => unifyKinds' k1 k2
adamc@2 89
adamc@2 90 | (L'.KError, _) => ()
adamc@2 91 | (_, L'.KError) => ()
adamc@2 92
adamc@76 93 | (L'.KUnif (_, _, ref (SOME k1All)), _) => unifyKinds' k1All k2All
adamc@76 94 | (_, L'.KUnif (_, _, ref (SOME k2All))) => unifyKinds' k1All k2All
adamc@2 95
adamc@76 96 | (L'.KUnif (_, _, r1), L'.KUnif (_, _, r2)) =>
adamc@2 97 if r1 = r2 then
adamc@2 98 ()
adamc@2 99 else
adamc@2 100 r1 := SOME k2All
adamc@2 101
adamc@76 102 | (L'.KUnif (_, _, r), _) =>
adamc@2 103 if occursKind r k2All then
adamc@2 104 err KOccursCheckFailed
adamc@2 105 else
adamc@2 106 r := SOME k2All
adamc@76 107 | (_, L'.KUnif (_, _, r)) =>
adamc@2 108 if occursKind r k1All then
adamc@2 109 err KOccursCheckFailed
adamc@2 110 else
adamc@2 111 r := SOME k1All
adamc@2 112
adamc@2 113 | _ => err KIncompatible
adamc@2 114 end
adamc@2 115
adamc@3 116 exception KUnify of L'.kind * L'.kind * kunify_error
adamc@3 117
adamc@3 118 fun unifyKinds k1 k2 =
adamc@3 119 unifyKinds' k1 k2
adamc@3 120 handle KUnify' err => raise KUnify (k1, k2, err)
adamc@3 121
adamc@3 122 datatype con_error =
adamc@3 123 UnboundCon of ErrorMsg.span * string
adamc@157 124 | UnboundDatatype of ErrorMsg.span * string
adamc@34 125 | UnboundStrInCon of ErrorMsg.span * string
adamc@3 126 | WrongKind of L'.con * L'.kind * L'.kind * kunify_error
adamc@67 127 | DuplicateField of ErrorMsg.span * string
adamc@3 128
adamc@5 129 fun conError env err =
adamc@3 130 case err of
adamc@3 131 UnboundCon (loc, s) =>
adamc@3 132 ErrorMsg.errorAt loc ("Unbound constructor variable " ^ s)
adamc@157 133 | UnboundDatatype (loc, s) =>
adamc@157 134 ErrorMsg.errorAt loc ("Unbound datatype " ^ s)
adamc@34 135 | UnboundStrInCon (loc, s) =>
adamc@34 136 ErrorMsg.errorAt loc ("Unbound structure " ^ s)
adamc@3 137 | WrongKind (c, k1, k2, kerr) =>
adamc@3 138 (ErrorMsg.errorAt (#2 c) "Wrong kind";
adamc@5 139 eprefaces' [("Constructor", p_con env c),
adamc@5 140 ("Have kind", p_kind k1),
adamc@5 141 ("Need kind", p_kind k2)];
adamc@3 142 kunifyError kerr)
adamc@67 143 | DuplicateField (loc, s) =>
adamc@67 144 ErrorMsg.errorAt loc ("Duplicate record field " ^ s)
adamc@3 145
adamc@5 146 fun checkKind env c k1 k2 =
adamc@3 147 unifyKinds k1 k2
adamc@3 148 handle KUnify (k1, k2, err) =>
adamc@5 149 conError env (WrongKind (c, k1, k2, err))
adamc@3 150
adamc@3 151 val dummy = ErrorMsg.dummySpan
adamc@3 152
adamc@3 153 val ktype = (L'.KType, dummy)
adamc@3 154 val kname = (L'.KName, dummy)
adamc@12 155 val ktype_record = (L'.KRecord ktype, dummy)
adamc@3 156
adamc@3 157 val cerror = (L'.CError, dummy)
adamc@3 158 val kerror = (L'.KError, dummy)
adamc@10 159 val eerror = (L'.EError, dummy)
adamc@31 160 val sgnerror = (L'.SgnError, dummy)
adamc@31 161 val strerror = (L'.StrError, dummy)
adamc@3 162
adamc@56 163 val int = ref cerror
adamc@56 164 val float = ref cerror
adamc@56 165 val string = ref cerror
adamc@56 166
adamc@3 167 local
adamc@3 168 val count = ref 0
adamc@3 169 in
adamc@3 170
adamc@3 171 fun resetKunif () = count := 0
adamc@3 172
adamc@76 173 fun kunif loc =
adamc@3 174 let
adamc@3 175 val n = !count
adamc@3 176 val s = if n <= 26 then
adamc@3 177 str (chr (ord #"A" + n))
adamc@3 178 else
adamc@3 179 "U" ^ Int.toString (n - 26)
adamc@3 180 in
adamc@3 181 count := n + 1;
adamc@76 182 (L'.KUnif (loc, s, ref NONE), dummy)
adamc@3 183 end
adamc@3 184
adamc@3 185 end
adamc@3 186
adamc@10 187 local
adamc@10 188 val count = ref 0
adamc@10 189 in
adamc@10 190
adamc@10 191 fun resetCunif () = count := 0
adamc@10 192
adamc@76 193 fun cunif (loc, k) =
adamc@10 194 let
adamc@10 195 val n = !count
adamc@10 196 val s = if n <= 26 then
adamc@10 197 str (chr (ord #"A" + n))
adamc@10 198 else
adamc@10 199 "U" ^ Int.toString (n - 26)
adamc@10 200 in
adamc@10 201 count := n + 1;
adamc@76 202 (L'.CUnif (loc, k, s, ref NONE), dummy)
adamc@10 203 end
adamc@10 204
adamc@10 205 end
adamc@10 206
adamc@18 207 fun elabKind (k, loc) =
adamc@18 208 case k of
adamc@18 209 L.KType => (L'.KType, loc)
adamc@18 210 | L.KArrow (k1, k2) => (L'.KArrow (elabKind k1, elabKind k2), loc)
adamc@18 211 | L.KName => (L'.KName, loc)
adamc@18 212 | L.KRecord k => (L'.KRecord (elabKind k), loc)
adamc@82 213 | L.KUnit => (L'.KUnit, loc)
adamc@76 214 | L.KWild => kunif loc
adamc@18 215
adamc@67 216 fun foldKind (dom, ran, loc)=
adamc@67 217 (L'.KArrow ((L'.KArrow ((L'.KName, loc),
adamc@67 218 (L'.KArrow (dom,
adamc@67 219 (L'.KArrow (ran, ran), loc)), loc)), loc),
adamc@67 220 (L'.KArrow (ran,
adamc@67 221 (L'.KArrow ((L'.KRecord dom, loc),
adamc@67 222 ran), loc)), loc)), loc)
adamc@67 223
adamc@83 224 fun elabCon (env, denv) (c, loc) =
adamc@3 225 case c of
adamc@3 226 L.CAnnot (c, k) =>
adamc@3 227 let
adamc@3 228 val k' = elabKind k
adamc@83 229 val (c', ck, gs) = elabCon (env, denv) c
adamc@3 230 in
adamc@5 231 checkKind env c' ck k';
adamc@83 232 (c', k', gs)
adamc@3 233 end
adamc@3 234
adamc@3 235 | L.TFun (t1, t2) =>
adamc@3 236 let
adamc@83 237 val (t1', k1, gs1) = elabCon (env, denv) t1
adamc@83 238 val (t2', k2, gs2) = elabCon (env, denv) t2
adamc@3 239 in
adamc@5 240 checkKind env t1' k1 ktype;
adamc@5 241 checkKind env t2' k2 ktype;
adamc@83 242 ((L'.TFun (t1', t2'), loc), ktype, gs1 @ gs2)
adamc@3 243 end
adamc@3 244 | L.TCFun (e, x, k, t) =>
adamc@3 245 let
adamc@3 246 val e' = elabExplicitness e
adamc@3 247 val k' = elabKind k
adamc@3 248 val env' = E.pushCRel env x k'
adamc@83 249 val (t', tk, gs) = elabCon (env', D.enter denv) t
adamc@3 250 in
adamc@5 251 checkKind env t' tk ktype;
adamc@83 252 ((L'.TCFun (e', x, k', t'), loc), ktype, gs)
adamc@3 253 end
adamc@85 254 | L.TDisjoint (c1, c2, c) =>
adamc@85 255 let
adamc@85 256 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@85 257 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@85 258
adamc@85 259 val ku1 = kunif loc
adamc@85 260 val ku2 = kunif loc
adamc@85 261
adamc@90 262 val (denv', gs3) = D.assert env denv (c1', c2')
adamc@90 263 val (c', k, gs4) = elabCon (env, denv') c
adamc@85 264 in
adamc@85 265 checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@85 266 checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@85 267
adamc@90 268 ((L'.TDisjoint (c1', c2', c'), loc), k, gs1 @ gs2 @ gs3 @ gs4)
adamc@85 269 end
adamc@3 270 | L.TRecord c =>
adamc@3 271 let
adamc@83 272 val (c', ck, gs) = elabCon (env, denv) c
adamc@3 273 val k = (L'.KRecord ktype, loc)
adamc@3 274 in
adamc@5 275 checkKind env c' ck k;
adamc@83 276 ((L'.TRecord c', loc), ktype, gs)
adamc@3 277 end
adamc@3 278
adamc@34 279 | L.CVar ([], s) =>
adamc@3 280 (case E.lookupC env s of
adamc@9 281 E.NotBound =>
adamc@5 282 (conError env (UnboundCon (loc, s));
adamc@83 283 (cerror, kerror, []))
adamc@9 284 | E.Rel (n, k) =>
adamc@83 285 ((L'.CRel n, loc), k, [])
adamc@9 286 | E.Named (n, k) =>
adamc@83 287 ((L'.CNamed n, loc), k, []))
adamc@34 288 | L.CVar (m1 :: ms, s) =>
adamc@34 289 (case E.lookupStr env m1 of
adamc@42 290 NONE => (conError env (UnboundStrInCon (loc, m1));
adamc@83 291 (cerror, kerror, []))
adamc@34 292 | SOME (n, sgn) =>
adamc@34 293 let
adamc@34 294 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34 295 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34 296 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@34 297 (strerror, sgnerror))
adamc@34 298 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34 299 ((L'.StrVar n, loc), sgn) ms
adamc@34 300
adamc@34 301 val k = case E.projectCon env {sgn = sgn, str = str, field = s} of
adamc@34 302 NONE => (conError env (UnboundCon (loc, s));
adamc@34 303 kerror)
adamc@34 304 | SOME (k, _) => k
adamc@34 305 in
adamc@83 306 ((L'.CModProj (n, ms, s), loc), k, [])
adamc@34 307 end)
adamc@34 308
adamc@3 309 | L.CApp (c1, c2) =>
adamc@3 310 let
adamc@83 311 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@83 312 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@76 313 val dom = kunif loc
adamc@76 314 val ran = kunif loc
adamc@3 315 in
adamc@5 316 checkKind env c1' k1 (L'.KArrow (dom, ran), loc);
adamc@5 317 checkKind env c2' k2 dom;
adamc@83 318 ((L'.CApp (c1', c2'), loc), ran, gs1 @ gs2)
adamc@3 319 end
adamc@67 320 | L.CAbs (x, ko, t) =>
adamc@3 321 let
adamc@67 322 val k' = case ko of
adamc@76 323 NONE => kunif loc
adamc@67 324 | SOME k => elabKind k
adamc@3 325 val env' = E.pushCRel env x k'
adamc@83 326 val (t', tk, gs) = elabCon (env', D.enter denv) t
adamc@3 327 in
adamc@8 328 ((L'.CAbs (x, k', t'), loc),
adamc@83 329 (L'.KArrow (k', tk), loc),
adamc@83 330 gs)
adamc@3 331 end
adamc@3 332
adamc@84 333 | L.CDisjoint (c1, c2, c) =>
adamc@84 334 let
adamc@84 335 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@84 336 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@84 337
adamc@84 338 val ku1 = kunif loc
adamc@84 339 val ku2 = kunif loc
adamc@84 340
adamc@90 341 val (denv', gs3) = D.assert env denv (c1', c2')
adamc@90 342 val (c', k, gs4) = elabCon (env, denv') c
adamc@84 343 in
adamc@84 344 checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@84 345 checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@84 346
adamc@90 347 ((L'.CDisjoint (c1', c2', c'), loc), k, gs1 @ gs2 @ gs3 @ gs4)
adamc@84 348 end
adamc@84 349
adamc@3 350 | L.CName s =>
adamc@83 351 ((L'.CName s, loc), kname, [])
adamc@3 352
adamc@3 353 | L.CRecord xcs =>
adamc@3 354 let
adamc@76 355 val k = kunif loc
adamc@3 356
adamc@83 357 val (xcs', gs) = ListUtil.foldlMap (fn ((x, c), gs) =>
adamc@83 358 let
adamc@83 359 val (x', xk, gs1) = elabCon (env, denv) x
adamc@83 360 val (c', ck, gs2) = elabCon (env, denv) c
adamc@83 361 in
adamc@83 362 checkKind env x' xk kname;
adamc@83 363 checkKind env c' ck k;
adamc@83 364 ((x', c'), gs1 @ gs2 @ gs)
adamc@83 365 end) [] xcs
adamc@67 366
adamc@67 367 val rc = (L'.CRecord (k, xcs'), loc)
adamc@67 368 (* Add duplicate field checking later. *)
adamc@83 369
adamc@83 370 fun prove (xcs, ds) =
adamc@83 371 case xcs of
adamc@83 372 [] => ds
adamc@83 373 | xc :: rest =>
adamc@83 374 let
adamc@83 375 val r1 = (L'.CRecord (k, [xc]), loc)
adamc@83 376 val ds = foldl (fn (xc', ds) =>
adamc@83 377 let
adamc@83 378 val r2 = (L'.CRecord (k, [xc']), loc)
adamc@83 379 in
adamc@90 380 D.prove env denv (r1, r2, loc) @ ds
adamc@83 381 end)
adamc@83 382 ds rest
adamc@83 383 in
adamc@83 384 prove (rest, ds)
adamc@83 385 end
adamc@3 386 in
adamc@83 387 (rc, (L'.KRecord k, loc), prove (xcs', gs))
adamc@3 388 end
adamc@3 389 | L.CConcat (c1, c2) =>
adamc@3 390 let
adamc@83 391 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@83 392 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@76 393 val ku = kunif loc
adamc@3 394 val k = (L'.KRecord ku, loc)
adamc@3 395 in
adamc@5 396 checkKind env c1' k1 k;
adamc@5 397 checkKind env c2' k2 k;
adamc@83 398 ((L'.CConcat (c1', c2'), loc), k,
adamc@90 399 D.prove env denv (c1', c2', loc) @ gs1 @ gs2)
adamc@3 400 end
adamc@67 401 | L.CFold =>
adamc@67 402 let
adamc@76 403 val dom = kunif loc
adamc@76 404 val ran = kunif loc
adamc@67 405 in
adamc@67 406 ((L'.CFold (dom, ran), loc),
adamc@83 407 foldKind (dom, ran, loc),
adamc@83 408 [])
adamc@67 409 end
adamc@3 410
adamc@83 411 | L.CUnit => ((L'.CUnit, loc), (L'.KUnit, loc), [])
adamc@82 412
adamc@18 413 | L.CWild k =>
adamc@18 414 let
adamc@18 415 val k' = elabKind k
adamc@18 416 in
adamc@83 417 (cunif (loc, k'), k', [])
adamc@18 418 end
adamc@18 419
adamc@6 420 fun kunifsRemain k =
adamc@6 421 case k of
adamc@76 422 L'.KUnif (_, _, ref NONE) => true
adamc@6 423 | _ => false
adamc@10 424 fun cunifsRemain c =
adamc@10 425 case c of
adamc@76 426 L'.CUnif (loc, _, _, ref NONE) => SOME loc
adamc@76 427 | _ => NONE
adamc@6 428
adamc@76 429 val kunifsInDecl = U.Decl.exists {kind = kunifsRemain,
adamc@76 430 con = fn _ => false,
adamc@76 431 exp = fn _ => false,
adamc@76 432 sgn_item = fn _ => false,
adamc@76 433 sgn = fn _ => false,
adamc@76 434 str = fn _ => false,
adamc@76 435 decl = fn _ => false}
adamc@10 436
adamc@76 437 val cunifsInDecl = U.Decl.search {kind = fn _ => NONE,
adamc@76 438 con = cunifsRemain,
adamc@76 439 exp = fn _ => NONE,
adamc@76 440 sgn_item = fn _ => NONE,
adamc@76 441 sgn = fn _ => NONE,
adamc@76 442 str = fn _ => NONE,
adamc@76 443 decl = fn _ => NONE}
adamc@10 444
adamc@10 445 fun occursCon r =
adamc@10 446 U.Con.exists {kind = fn _ => false,
adamc@76 447 con = fn L'.CUnif (_, _, _, r') => r = r'
adamc@10 448 | _ => false}
adamc@10 449
adamc@10 450 datatype cunify_error =
adamc@10 451 CKind of L'.kind * L'.kind * kunify_error
adamc@10 452 | COccursCheckFailed of L'.con * L'.con
adamc@10 453 | CIncompatible of L'.con * L'.con
adamc@10 454 | CExplicitness of L'.con * L'.con
adamc@141 455 | CKindof of L'.kind * L'.con
adamc@153 456 | CRecordFailure of PD.pp_desc * PD.pp_desc
adamc@10 457
adamc@10 458 exception CUnify' of cunify_error
adamc@10 459
adamc@10 460 fun cunifyError env err =
adamc@10 461 case err of
adamc@10 462 CKind (k1, k2, kerr) =>
adamc@10 463 (eprefaces "Kind unification failure"
adamc@10 464 [("Kind 1", p_kind k1),
adamc@10 465 ("Kind 2", p_kind k2)];
adamc@10 466 kunifyError kerr)
adamc@10 467 | COccursCheckFailed (c1, c2) =>
adamc@10 468 eprefaces "Constructor occurs check failed"
adamc@10 469 [("Con 1", p_con env c1),
adamc@10 470 ("Con 2", p_con env c2)]
adamc@10 471 | CIncompatible (c1, c2) =>
adamc@10 472 eprefaces "Incompatible constructors"
adamc@10 473 [("Con 1", p_con env c1),
adamc@10 474 ("Con 2", p_con env c2)]
adamc@10 475 | CExplicitness (c1, c2) =>
adamc@10 476 eprefaces "Differing constructor function explicitness"
adamc@10 477 [("Con 1", p_con env c1),
adamc@10 478 ("Con 2", p_con env c2)]
adamc@141 479 | CKindof (k, c) =>
adamc@147 480 eprefaces "Unexpected kind for kindof calculation"
adamc@141 481 [("Kind", p_kind k),
adamc@141 482 ("Con", p_con env c)]
adamc@153 483 | CRecordFailure (s1, s2) =>
adamc@153 484 eprefaces "Can't unify record constructors"
adamc@153 485 [("Summary 1", s1),
adamc@153 486 ("Summary 2", s2)]
adamc@10 487
adamc@13 488 exception SynUnif = E.SynUnif
adamc@12 489
adamc@81 490 open ElabOps
adamc@43 491
adamc@12 492 type record_summary = {
adamc@12 493 fields : (L'.con * L'.con) list,
adamc@12 494 unifs : (L'.con * L'.con option ref) list,
adamc@12 495 others : L'.con list
adamc@12 496 }
adamc@12 497
adamc@12 498 fun summaryToCon {fields, unifs, others} =
adamc@12 499 let
adamc@12 500 val c = (L'.CRecord (ktype, []), dummy)
adamc@12 501 val c = List.foldr (fn (c', c) => (L'.CConcat (c', c), dummy)) c others
adamc@12 502 val c = List.foldr (fn ((c', _), c) => (L'.CConcat (c', c), dummy)) c unifs
adamc@12 503 in
adamc@12 504 (L'.CConcat ((L'.CRecord (ktype, fields), dummy), c), dummy)
adamc@12 505 end
adamc@12 506
adamc@12 507 fun p_summary env s = p_con env (summaryToCon s)
adamc@12 508
adamc@12 509 exception CUnify of L'.con * L'.con * cunify_error
adamc@12 510
adamc@12 511 fun hnormKind (kAll as (k, _)) =
adamc@12 512 case k of
adamc@76 513 L'.KUnif (_, _, ref (SOME k)) => hnormKind k
adamc@12 514 | _ => kAll
adamc@12 515
adamc@12 516 fun kindof env (c, loc) =
adamc@12 517 case c of
adamc@12 518 L'.TFun _ => ktype
adamc@12 519 | L'.TCFun _ => ktype
adamc@85 520 | L'.TDisjoint _ => ktype
adamc@12 521 | L'.TRecord _ => ktype
adamc@12 522
adamc@12 523 | L'.CRel xn => #2 (E.lookupCRel env xn)
adamc@12 524 | L'.CNamed xn => #2 (E.lookupCNamed env xn)
adamc@34 525 | L'.CModProj (n, ms, x) =>
adamc@34 526 let
adamc@34 527 val (_, sgn) = E.lookupStrNamed env n
adamc@34 528 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34 529 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34 530 NONE => raise Fail "kindof: Unknown substructure"
adamc@34 531 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34 532 ((L'.StrVar n, loc), sgn) ms
adamc@34 533 in
adamc@34 534 case E.projectCon env {sgn = sgn, str = str, field = x} of
adamc@34 535 NONE => raise Fail "kindof: Unknown con in structure"
adamc@34 536 | SOME (k, _) => k
adamc@34 537 end
adamc@34 538
adamc@12 539 | L'.CApp (c, _) =>
adamc@141 540 (case hnormKind (kindof env c) of
adamc@141 541 (L'.KArrow (_, k), _) => k
adamc@141 542 | (L'.KError, _) => kerror
adamc@141 543 | k => raise CUnify' (CKindof (k, c)))
adamc@12 544 | L'.CAbs (x, k, c) => (L'.KArrow (k, kindof (E.pushCRel env x k) c), loc)
adamc@84 545 | L'.CDisjoint (_, _, c) => kindof env c
adamc@12 546
adamc@12 547 | L'.CName _ => kname
adamc@12 548
adamc@12 549 | L'.CRecord (k, _) => (L'.KRecord k, loc)
adamc@12 550 | L'.CConcat (c, _) => kindof env c
adamc@67 551 | L'.CFold (dom, ran) => foldKind (dom, ran, loc)
adamc@12 552
adamc@82 553 | L'.CUnit => (L'.KUnit, loc)
adamc@82 554
adamc@12 555 | L'.CError => kerror
adamc@76 556 | L'.CUnif (_, k, _, _) => k
adamc@12 557
adamc@90 558 val hnormCon = D.hnormCon
adamc@86 559
adamc@86 560 fun unifyRecordCons (env, denv) (c1, c2) =
adamc@12 561 let
adamc@92 562 fun rkindof c =
adamc@147 563 case hnormKind (kindof env c) of
adamc@92 564 (L'.KRecord k, _) => k
adamc@141 565 | (L'.KError, _) => kerror
adamc@141 566 | k => raise CUnify' (CKindof (k, c))
adamc@92 567
adamc@92 568 val k1 = rkindof c1
adamc@92 569 val k2 = rkindof c2
adamc@86 570
adamc@86 571 val (r1, gs1) = recordSummary (env, denv) c1
adamc@86 572 val (r2, gs2) = recordSummary (env, denv) c2
adamc@12 573 in
adamc@12 574 unifyKinds k1 k2;
adamc@86 575 unifySummaries (env, denv) (k1, r1, r2);
adamc@86 576 gs1 @ gs2
adamc@12 577 end
adamc@12 578
adamc@86 579 and recordSummary (env, denv) c =
adamc@86 580 let
adamc@86 581 val (c, gs) = hnormCon (env, denv) c
adamc@12 582
adamc@86 583 val (sum, gs') =
adamc@86 584 case c of
adamc@86 585 (L'.CRecord (_, xcs), _) => ({fields = xcs, unifs = [], others = []}, [])
adamc@86 586 | (L'.CConcat (c1, c2), _) =>
adamc@86 587 let
adamc@86 588 val (s1, gs1) = recordSummary (env, denv) c1
adamc@86 589 val (s2, gs2) = recordSummary (env, denv) c2
adamc@86 590 in
adamc@86 591 ({fields = #fields s1 @ #fields s2,
adamc@86 592 unifs = #unifs s1 @ #unifs s2,
adamc@86 593 others = #others s1 @ #others s2},
adamc@86 594 gs1 @ gs2)
adamc@86 595 end
adamc@86 596 | (L'.CUnif (_, _, _, ref (SOME c)), _) => recordSummary (env, denv) c
adamc@86 597 | c' as (L'.CUnif (_, _, _, r), _) => ({fields = [], unifs = [(c', r)], others = []}, [])
adamc@86 598 | c' => ({fields = [], unifs = [], others = [c']}, [])
adamc@86 599 in
adamc@86 600 (sum, gs @ gs')
adamc@86 601 end
adamc@86 602
adamc@86 603 and consEq (env, denv) (c1, c2) =
adamc@86 604 (case unifyCons (env, denv) c1 c2 of
adamc@86 605 [] => true
adamc@86 606 | _ => false)
adamc@12 607 handle CUnify _ => false
adamc@12 608
adamc@80 609 and consNeq env (c1, c2) =
adamc@86 610 case (#1 (ElabOps.hnormCon env c1), #1 (ElabOps.hnormCon env c2)) of
adamc@80 611 (L'.CName x1, L'.CName x2) => x1 <> x2
adamc@80 612 | _ => false
adamc@80 613
adamc@86 614 and unifySummaries (env, denv) (k, s1 : record_summary, s2 : record_summary) =
adamc@12 615 let
adamc@14 616 (*val () = eprefaces "Summaries" [("#1", p_summary env s1),
adamc@14 617 ("#2", p_summary env s2)]*)
adamc@12 618
adamc@12 619 fun eatMatching p (ls1, ls2) =
adamc@12 620 let
adamc@12 621 fun em (ls1, ls2, passed1) =
adamc@12 622 case ls1 of
adamc@12 623 [] => (rev passed1, ls2)
adamc@12 624 | h1 :: t1 =>
adamc@12 625 let
adamc@12 626 fun search (ls2', passed2) =
adamc@12 627 case ls2' of
adamc@12 628 [] => em (t1, ls2, h1 :: passed1)
adamc@12 629 | h2 :: t2 =>
adamc@12 630 if p (h1, h2) then
adamc@12 631 em (t1, List.revAppend (passed2, t2), passed1)
adamc@12 632 else
adamc@12 633 search (t2, h2 :: passed2)
adamc@12 634 in
adamc@12 635 search (ls2, [])
adamc@12 636 end
adamc@12 637 in
adamc@12 638 em (ls1, ls2, [])
adamc@12 639 end
adamc@12 640
adamc@12 641 val (fs1, fs2) = eatMatching (fn ((x1, c1), (x2, c2)) =>
adamc@80 642 not (consNeq env (x1, x2))
adamc@86 643 andalso consEq (env, denv) (c1, c2)
adamc@86 644 andalso consEq (env, denv) (x1, x2))
adamc@79 645 (#fields s1, #fields s2)
adamc@14 646 (*val () = eprefaces "Summaries2" [("#1", p_summary env {fields = fs1, unifs = #unifs s1, others = #others s1}),
adamc@14 647 ("#2", p_summary env {fields = fs2, unifs = #unifs s2, others = #others s2})]*)
adamc@12 648 val (unifs1, unifs2) = eatMatching (fn ((_, r1), (_, r2)) => r1 = r2) (#unifs s1, #unifs s2)
adamc@86 649 val (others1, others2) = eatMatching (consEq (env, denv)) (#others s1, #others s2)
adamc@12 650
adamc@12 651 fun unifFields (fs, others, unifs) =
adamc@12 652 case (fs, others, unifs) of
adamc@12 653 ([], [], _) => ([], [], unifs)
adamc@12 654 | (_, _, []) => (fs, others, [])
adamc@12 655 | (_, _, (_, r) :: rest) =>
adamc@12 656 let
adamc@12 657 val r' = ref NONE
adamc@141 658 val kr = (L'.KRecord k, dummy)
adamc@141 659 val cr' = (L'.CUnif (dummy, kr, "recd", r'), dummy)
adamc@12 660
adamc@12 661 val prefix = case (fs, others) of
adamc@12 662 ([], other :: others) =>
adamc@12 663 List.foldl (fn (other, c) =>
adamc@12 664 (L'.CConcat (c, other), dummy))
adamc@12 665 other others
adamc@12 666 | (fs, []) =>
adamc@12 667 (L'.CRecord (k, fs), dummy)
adamc@12 668 | (fs, others) =>
adamc@12 669 List.foldl (fn (other, c) =>
adamc@12 670 (L'.CConcat (c, other), dummy))
adamc@12 671 (L'.CRecord (k, fs), dummy) others
adamc@12 672 in
adamc@12 673 r := SOME (L'.CConcat (prefix, cr'), dummy);
adamc@12 674 ([], [], (cr', r') :: rest)
adamc@12 675 end
adamc@12 676
adamc@12 677 val (fs1, others1, unifs2) = unifFields (fs1, others1, unifs2)
adamc@12 678 val (fs2, others2, unifs1) = unifFields (fs2, others2, unifs1)
adamc@12 679
adamc@86 680 val clear = case (fs1, others1, fs2, others2) of
adamc@86 681 ([], [], [], []) => true
adamc@12 682 | _ => false
adamc@12 683 val empty = (L'.CRecord (k, []), dummy)
adamc@12 684 fun pairOffUnifs (unifs1, unifs2) =
adamc@12 685 case (unifs1, unifs2) of
adamc@12 686 ([], _) =>
adamc@86 687 if clear then
adamc@12 688 List.app (fn (_, r) => r := SOME empty) unifs2
adamc@12 689 else
adamc@153 690 raise CUnify' (CRecordFailure (p_summary env s1, p_summary env s2))
adamc@12 691 | (_, []) =>
adamc@86 692 if clear then
adamc@12 693 List.app (fn (_, r) => r := SOME empty) unifs1
adamc@12 694 else
adamc@153 695 raise CUnify' (CRecordFailure (p_summary env s1, p_summary env s2))
adamc@12 696 | ((c1, _) :: rest1, (_, r2) :: rest2) =>
adamc@12 697 (r2 := SOME c1;
adamc@12 698 pairOffUnifs (rest1, rest2))
adamc@12 699 in
adamc@12 700 pairOffUnifs (unifs1, unifs2)
adamc@12 701 end
adamc@12 702
adamc@86 703 and unifyCons' (env, denv) c1 c2 =
adamc@86 704 let
adamc@86 705 val (c1, gs1) = hnormCon (env, denv) c1
adamc@86 706 val (c2, gs2) = hnormCon (env, denv) c2
adamc@90 707 val gs3 = unifyCons'' (env, denv) c1 c2
adamc@86 708 in
adamc@90 709 gs1 @ gs2 @ gs3
adamc@86 710 end
adamc@11 711
adamc@86 712 and unifyCons'' (env, denv) (c1All as (c1, _)) (c2All as (c2, _)) =
adamc@10 713 let
adamc@10 714 fun err f = raise CUnify' (f (c1All, c2All))
adamc@12 715
adamc@86 716 fun isRecord () = unifyRecordCons (env, denv) (c1All, c2All)
adamc@10 717 in
adamc@92 718 (*eprefaces "unifyCons''" [("c1All", p_con env c1All),
adamc@92 719 ("c2All", p_con env c2All)];*)
adamc@92 720
adamc@10 721 case (c1, c2) of
adamc@88 722 (L'.CUnit, L'.CUnit) => []
adamc@88 723
adamc@88 724 | (L'.TFun (d1, r1), L'.TFun (d2, r2)) =>
adamc@86 725 unifyCons' (env, denv) d1 d2
adamc@86 726 @ unifyCons' (env, denv) r1 r2
adamc@10 727 | (L'.TCFun (expl1, x1, d1, r1), L'.TCFun (expl2, _, d2, r2)) =>
adamc@10 728 if expl1 <> expl2 then
adamc@10 729 err CExplicitness
adamc@10 730 else
adamc@10 731 (unifyKinds d1 d2;
adamc@86 732 unifyCons' (E.pushCRel env x1 d1, D.enter denv) r1 r2)
adamc@86 733 | (L'.TRecord r1, L'.TRecord r2) => unifyCons' (env, denv) r1 r2
adamc@10 734
adamc@10 735 | (L'.CRel n1, L'.CRel n2) =>
adamc@10 736 if n1 = n2 then
adamc@86 737 []
adamc@10 738 else
adamc@10 739 err CIncompatible
adamc@10 740 | (L'.CNamed n1, L'.CNamed n2) =>
adamc@10 741 if n1 = n2 then
adamc@86 742 []
adamc@10 743 else
adamc@10 744 err CIncompatible
adamc@10 745
adamc@10 746 | (L'.CApp (d1, r1), L'.CApp (d2, r2)) =>
adamc@86 747 (unifyCons' (env, denv) d1 d2;
adamc@86 748 unifyCons' (env, denv) r1 r2)
adamc@10 749 | (L'.CAbs (x1, k1, c1), L'.CAbs (_, k2, c2)) =>
adamc@10 750 (unifyKinds k1 k2;
adamc@86 751 unifyCons' (E.pushCRel env x1 k1, D.enter denv) c1 c2)
adamc@10 752
adamc@10 753 | (L'.CName n1, L'.CName n2) =>
adamc@10 754 if n1 = n2 then
adamc@86 755 []
adamc@10 756 else
adamc@10 757 err CIncompatible
adamc@10 758
adamc@34 759 | (L'.CModProj (n1, ms1, x1), L'.CModProj (n2, ms2, x2)) =>
adamc@34 760 if n1 = n2 andalso ms1 = ms2 andalso x1 = x2 then
adamc@86 761 []
adamc@34 762 else
adamc@34 763 err CIncompatible
adamc@34 764
adamc@86 765 | (L'.CError, _) => []
adamc@86 766 | (_, L'.CError) => []
adamc@10 767
adamc@92 768 | (L'.CRecord _, _) => isRecord ()
adamc@92 769 | (_, L'.CRecord _) => isRecord ()
adamc@92 770 | (L'.CConcat _, _) => isRecord ()
adamc@92 771 | (_, L'.CConcat _) => isRecord ()
adamc@92 772 (*| (L'.CUnif (_, (L'.KRecord _, _), _, _), _) => isRecord ()
adamc@92 773 | (_, L'.CUnif (_, (L'.KRecord _, _), _, _)) => isRecord ()*)
adamc@10 774
adamc@76 775 | (L'.CUnif (_, k1, _, r1), L'.CUnif (_, k2, _, r2)) =>
adamc@10 776 if r1 = r2 then
adamc@86 777 []
adamc@10 778 else
adamc@10 779 (unifyKinds k1 k2;
adamc@86 780 r1 := SOME c2All;
adamc@86 781 [])
adamc@10 782
adamc@76 783 | (L'.CUnif (_, _, _, r), _) =>
adamc@10 784 if occursCon r c2All then
adamc@10 785 err COccursCheckFailed
adamc@10 786 else
adamc@86 787 (r := SOME c2All;
adamc@86 788 [])
adamc@76 789 | (_, L'.CUnif (_, _, _, r)) =>
adamc@10 790 if occursCon r c1All then
adamc@10 791 err COccursCheckFailed
adamc@10 792 else
adamc@86 793 (r := SOME c1All;
adamc@86 794 [])
adamc@10 795
adamc@12 796
adamc@71 797 | (L'.CFold (dom1, ran1), L'.CFold (dom2, ran2)) =>
adamc@71 798 (unifyKinds dom1 dom2;
adamc@86 799 unifyKinds ran1 ran2;
adamc@86 800 [])
adamc@71 801
adamc@10 802 | _ => err CIncompatible
adamc@10 803 end
adamc@10 804
adamc@86 805 and unifyCons (env, denv) c1 c2 =
adamc@86 806 unifyCons' (env, denv) c1 c2
adamc@10 807 handle CUnify' err => raise CUnify (c1, c2, err)
adamc@10 808 | KUnify args => raise CUnify (c1, c2, CKind args)
adamc@10 809
adamc@10 810 datatype exp_error =
adamc@10 811 UnboundExp of ErrorMsg.span * string
adamc@34 812 | UnboundStrInExp of ErrorMsg.span * string
adamc@10 813 | Unify of L'.exp * L'.con * L'.con * cunify_error
adamc@11 814 | Unif of string * L'.con
adamc@11 815 | WrongForm of string * L'.exp * L'.con
adamc@92 816 | IncompatibleCons of L'.con * L'.con
adamc@171 817 | DuplicatePatternVariable of ErrorMsg.span * string
adamc@171 818 | PatUnify of L'.pat * L'.con * L'.con * cunify_error
adamc@174 819 | UnboundConstructor of ErrorMsg.span * string list * string
adamc@171 820 | PatHasArg of ErrorMsg.span
adamc@171 821 | PatHasNoArg of ErrorMsg.span
adamc@172 822 | Inexhaustive of ErrorMsg.span
adamc@175 823 | DuplicatePatField of ErrorMsg.span * string
adamc@10 824
adamc@10 825 fun expError env err =
adamc@10 826 case err of
adamc@10 827 UnboundExp (loc, s) =>
adamc@10 828 ErrorMsg.errorAt loc ("Unbound expression variable " ^ s)
adamc@34 829 | UnboundStrInExp (loc, s) =>
adamc@34 830 ErrorMsg.errorAt loc ("Unbound structure " ^ s)
adamc@10 831 | Unify (e, c1, c2, uerr) =>
adamc@10 832 (ErrorMsg.errorAt (#2 e) "Unification failure";
adamc@10 833 eprefaces' [("Expression", p_exp env e),
adamc@10 834 ("Have con", p_con env c1),
adamc@10 835 ("Need con", p_con env c2)];
adamc@10 836 cunifyError env uerr)
adamc@11 837 | Unif (action, c) =>
adamc@11 838 (ErrorMsg.errorAt (#2 c) ("Unification variable blocks " ^ action);
adamc@11 839 eprefaces' [("Con", p_con env c)])
adamc@11 840 | WrongForm (variety, e, t) =>
adamc@11 841 (ErrorMsg.errorAt (#2 e) ("Expression is not a " ^ variety);
adamc@11 842 eprefaces' [("Expression", p_exp env e),
adamc@11 843 ("Type", p_con env t)])
adamc@92 844 | IncompatibleCons (c1, c2) =>
adamc@92 845 (ErrorMsg.errorAt (#2 c1) "Incompatible constructors";
adamc@92 846 eprefaces' [("Con 1", p_con env c1),
adamc@92 847 ("Con 2", p_con env c2)])
adamc@171 848 | DuplicatePatternVariable (loc, s) =>
adamc@171 849 ErrorMsg.errorAt loc ("Duplicate pattern variable " ^ s)
adamc@171 850 | PatUnify (p, c1, c2, uerr) =>
adamc@171 851 (ErrorMsg.errorAt (#2 p) "Unification failure for pattern";
adamc@171 852 eprefaces' [("Pattern", p_pat env p),
adamc@171 853 ("Have con", p_con env c1),
adamc@171 854 ("Need con", p_con env c2)];
adamc@171 855 cunifyError env uerr)
adamc@174 856 | UnboundConstructor (loc, ms, s) =>
adamc@174 857 ErrorMsg.errorAt loc ("Unbound constructor " ^ String.concatWith "." (ms @ [s]) ^ " in pattern")
adamc@171 858 | PatHasArg loc =>
adamc@171 859 ErrorMsg.errorAt loc "Constructor expects no argument but is used with argument"
adamc@171 860 | PatHasNoArg loc =>
adamc@171 861 ErrorMsg.errorAt loc "Constructor expects argument but is used with no argument"
adamc@172 862 | Inexhaustive loc =>
adamc@172 863 ErrorMsg.errorAt loc "Inexhaustive 'case'"
adamc@175 864 | DuplicatePatField (loc, s) =>
adamc@175 865 ErrorMsg.errorAt loc ("Duplicate record field " ^ s ^ " in pattern")
adamc@10 866
adamc@86 867 fun checkCon (env, denv) e c1 c2 =
adamc@86 868 unifyCons (env, denv) c1 c2
adamc@10 869 handle CUnify (c1, c2, err) =>
adamc@86 870 (expError env (Unify (e, c1, c2, err));
adamc@86 871 [])
adamc@10 872
adamc@171 873 fun checkPatCon (env, denv) p c1 c2 =
adamc@171 874 unifyCons (env, denv) c1 c2
adamc@171 875 handle CUnify (c1, c2, err) =>
adamc@171 876 (expError env (PatUnify (p, c1, c2, err));
adamc@171 877 [])
adamc@171 878
adamc@14 879 fun primType env p =
adamc@56 880 case p of
adamc@56 881 P.Int _ => !int
adamc@56 882 | P.Float _ => !float
adamc@56 883 | P.String _ => !string
adamc@14 884
adamc@71 885 fun recCons (k, nm, v, rest, loc) =
adamc@71 886 (L'.CConcat ((L'.CRecord (k, [(nm, v)]), loc),
adamc@71 887 rest), loc)
adamc@71 888
adamc@71 889 fun foldType (dom, loc) =
adamc@71 890 (L'.TCFun (L'.Explicit, "ran", (L'.KArrow ((L'.KRecord dom, loc), (L'.KType, loc)), loc),
adamc@71 891 (L'.TFun ((L'.TCFun (L'.Explicit, "nm", (L'.KName, loc),
adamc@71 892 (L'.TCFun (L'.Explicit, "v", dom,
adamc@71 893 (L'.TCFun (L'.Explicit, "rest", (L'.KRecord dom, loc),
adamc@71 894 (L'.TFun ((L'.CApp ((L'.CRel 3, loc), (L'.CRel 0, loc)), loc),
adamc@71 895 (L'.CApp ((L'.CRel 3, loc),
adamc@71 896 recCons (dom,
adamc@71 897 (L'.CRel 2, loc),
adamc@71 898 (L'.CRel 1, loc),
adamc@71 899 (L'.CRel 0, loc),
adamc@71 900 loc)), loc)), loc)),
adamc@71 901 loc)), loc)), loc),
adamc@71 902 (L'.TFun ((L'.CApp ((L'.CRel 0, loc), (L'.CRecord (dom, []), loc)), loc),
adamc@71 903 (L'.TCFun (L'.Explicit, "r", (L'.KRecord dom, loc),
adamc@71 904 (L'.CApp ((L'.CRel 1, loc), (L'.CRel 0, loc)), loc)), loc)),
adamc@71 905 loc)), loc)), loc)
adamc@71 906
adamc@86 907 fun elabHead (env, denv) (e as (_, loc)) t =
adamc@15 908 let
adamc@15 909 fun unravel (t, e) =
adamc@86 910 let
adamc@86 911 val (t, gs) = hnormCon (env, denv) t
adamc@86 912 in
adamc@86 913 case t of
adamc@86 914 (L'.TCFun (L'.Implicit, x, k, t'), _) =>
adamc@86 915 let
adamc@86 916 val u = cunif (loc, k)
adamc@86 917
adamc@86 918 val (e, t, gs') = unravel (subConInCon (0, u) t',
adamc@86 919 (L'.ECApp (e, u), loc))
adamc@86 920 in
adamc@86 921 (e, t, gs @ gs')
adamc@86 922 end
adamc@86 923 | _ => (e, t, gs)
adamc@86 924 end
adamc@15 925 in
adamc@15 926 unravel (t, e)
adamc@15 927 end
adamc@15 928
adamc@174 929 fun elabPat (pAll as (p, loc), (env, denv, bound)) =
adamc@171 930 let
adamc@171 931 val perror = (L'.PWild, loc)
adamc@171 932 val terror = (L'.CError, loc)
adamc@171 933 val pterror = (perror, terror)
adamc@171 934 val rerror = (pterror, (env, bound))
adamc@171 935
adamc@191 936 fun pcon (pc, po, xs, to, dn, dk) =
adamc@188 937 case (po, to) of
adamc@188 938 (NONE, SOME _) => (expError env (PatHasNoArg loc);
adamc@188 939 rerror)
adamc@188 940 | (SOME _, NONE) => (expError env (PatHasArg loc);
adamc@188 941 rerror)
adamc@191 942 | (NONE, NONE) =>
adamc@191 943 let
adamc@191 944 val k = (L'.KType, loc)
adamc@191 945 val unifs = map (fn _ => cunif (loc, k)) xs
adamc@191 946 val dn = foldl (fn (u, dn) => (L'.CApp (dn, u), loc)) dn unifs
adamc@191 947 in
adamc@191 948 (((L'.PCon (dk, pc, unifs, NONE), loc), dn),
adamc@191 949 (env, bound))
adamc@191 950 end
adamc@188 951 | (SOME p, SOME t) =>
adamc@188 952 let
adamc@188 953 val ((p', pt), (env, bound)) = elabPat (p, (env, denv, bound))
adamc@191 954
adamc@191 955 val k = (L'.KType, loc)
adamc@191 956 val unifs = map (fn _ => cunif (loc, k)) xs
adamc@194 957 val nxs = length unifs - 1
adamc@194 958 val t = ListUtil.foldli (fn (i, u, t) => subConInCon (nxs - i, u) t) t unifs
adamc@191 959 val dn = foldl (fn (u, dn) => (L'.CApp (dn, u), loc)) dn unifs
adamc@188 960 in
adamc@191 961 ignore (checkPatCon (env, denv) p' pt t);
adamc@191 962 (((L'.PCon (dk, pc, unifs, SOME p'), loc), dn),
adamc@188 963 (env, bound))
adamc@188 964 end
adamc@171 965 in
adamc@171 966 case p of
adamc@171 967 L.PWild => (((L'.PWild, loc), cunif (loc, (L'.KType, loc))),
adamc@171 968 (env, bound))
adamc@171 969 | L.PVar x =>
adamc@171 970 let
adamc@171 971 val t = if SS.member (bound, x) then
adamc@171 972 (expError env (DuplicatePatternVariable (loc, x));
adamc@171 973 terror)
adamc@171 974 else
adamc@171 975 cunif (loc, (L'.KType, loc))
adamc@171 976 in
adamc@182 977 (((L'.PVar (x, t), loc), t),
adamc@171 978 (E.pushERel env x t, SS.add (bound, x)))
adamc@171 979 end
adamc@173 980 | L.PPrim p => (((L'.PPrim p, loc), primType env p),
adamc@173 981 (env, bound))
adamc@171 982 | L.PCon ([], x, po) =>
adamc@171 983 (case E.lookupConstructor env x of
adamc@174 984 NONE => (expError env (UnboundConstructor (loc, [], x));
adamc@171 985 rerror)
adamc@191 986 | SOME (dk, n, xs, to, dn) => pcon (L'.PConVar n, po, xs, to, (L'.CNamed dn, loc), dk))
adamc@174 987 | L.PCon (m1 :: ms, x, po) =>
adamc@174 988 (case E.lookupStr env m1 of
adamc@174 989 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@174 990 rerror)
adamc@174 991 | SOME (n, sgn) =>
adamc@174 992 let
adamc@174 993 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@174 994 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@182 995 NONE => raise Fail "elabPat: Unknown substructure"
adamc@174 996 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@174 997 ((L'.StrVar n, loc), sgn) ms
adamc@174 998 in
adamc@174 999 case E.projectConstructor env {str = str, sgn = sgn, field = x} of
adamc@174 1000 NONE => (expError env (UnboundConstructor (loc, m1 :: ms, x));
adamc@174 1001 rerror)
adamc@191 1002 | SOME (dk, _, xs, to, dn) => pcon (L'.PConProj (n, ms, x), po, xs, to, dn, dk)
adamc@174 1003 end)
adamc@174 1004
adamc@175 1005 | L.PRecord (xps, flex) =>
adamc@175 1006 let
adamc@175 1007 val (xpts, (env, bound, _)) =
adamc@175 1008 ListUtil.foldlMap (fn ((x, p), (env, bound, fbound)) =>
adamc@175 1009 let
adamc@175 1010 val ((p', t), (env, bound)) = elabPat (p, (env, denv, bound))
adamc@175 1011 in
adamc@175 1012 if SS.member (fbound, x) then
adamc@175 1013 expError env (DuplicatePatField (loc, x))
adamc@175 1014 else
adamc@175 1015 ();
adamc@175 1016 ((x, p', t), (env, bound, SS.add (fbound, x)))
adamc@175 1017 end)
adamc@175 1018 (env, bound, SS.empty) xps
adamc@175 1019
adamc@175 1020 val k = (L'.KType, loc)
adamc@175 1021 val c = (L'.CRecord (k, map (fn (x, _, t) => ((L'.CName x, loc), t)) xpts), loc)
adamc@176 1022 val c =
adamc@175 1023 if flex then
adamc@176 1024 (L'.CConcat (c, cunif (loc, (L'.KRecord k, loc))), loc)
adamc@175 1025 else
adamc@176 1026 c
adamc@175 1027 in
adamc@182 1028 (((L'.PRecord xpts, loc),
adamc@175 1029 (L'.TRecord c, loc)),
adamc@175 1030 (env, bound))
adamc@175 1031 end
adamc@175 1032
adamc@171 1033 end
adamc@171 1034
adamc@172 1035 datatype coverage =
adamc@172 1036 Wild
adamc@173 1037 | None
adamc@172 1038 | Datatype of coverage IM.map
adamc@175 1039 | Record of coverage SM.map list
adamc@172 1040
adamc@172 1041 fun exhaustive (env, denv, t, ps) =
adamc@172 1042 let
adamc@172 1043 fun pcCoverage pc =
adamc@172 1044 case pc of
adamc@172 1045 L'.PConVar n => n
adamc@174 1046 | L'.PConProj (m1, ms, x) =>
adamc@174 1047 let
adamc@174 1048 val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@174 1049 in
adamc@174 1050 case E.projectConstructor env {str = str, sgn = sgn, field = x} of
adamc@174 1051 NONE => raise Fail "exhaustive: Can't project constructor"
adamc@191 1052 | SOME (_, n, _, _, _) => n
adamc@174 1053 end
adamc@172 1054
adamc@172 1055 fun coverage (p, _) =
adamc@172 1056 case p of
adamc@172 1057 L'.PWild => Wild
adamc@172 1058 | L'.PVar _ => Wild
adamc@173 1059 | L'.PPrim _ => None
adamc@191 1060 | L'.PCon (_, pc, _, NONE) => Datatype (IM.insert (IM.empty, pcCoverage pc, Wild))
adamc@191 1061 | L'.PCon (_, pc, _, SOME p) => Datatype (IM.insert (IM.empty, pcCoverage pc, coverage p))
adamc@182 1062 | L'.PRecord xps => Record [foldl (fn ((x, p, _), fmap) =>
adamc@182 1063 SM.insert (fmap, x, coverage p)) SM.empty xps]
adamc@176 1064
adamc@172 1065 fun merge (c1, c2) =
adamc@172 1066 case (c1, c2) of
adamc@173 1067 (None, _) => c2
adamc@173 1068 | (_, None) => c1
adamc@173 1069
adamc@173 1070 | (Wild, _) => Wild
adamc@172 1071 | (_, Wild) => Wild
adamc@172 1072
adamc@172 1073 | (Datatype cm1, Datatype cm2) => Datatype (IM.unionWith merge (cm1, cm2))
adamc@172 1074
adamc@175 1075 | (Record fm1, Record fm2) => Record (fm1 @ fm2)
adamc@175 1076
adamc@175 1077 | _ => None
adamc@175 1078
adamc@172 1079 fun combinedCoverage ps =
adamc@172 1080 case ps of
adamc@172 1081 [] => raise Fail "Empty pattern list for coverage checking"
adamc@172 1082 | [p] => coverage p
adamc@172 1083 | p :: ps => merge (coverage p, combinedCoverage ps)
adamc@172 1084
adamc@175 1085 fun enumerateCases t =
adamc@175 1086 let
adamc@175 1087 fun dtype cons =
adamc@175 1088 ListUtil.mapConcat (fn (_, n, to) =>
adamc@175 1089 case to of
adamc@175 1090 NONE => [Datatype (IM.insert (IM.empty, n, Wild))]
adamc@175 1091 | SOME t => map (fn c => Datatype (IM.insert (IM.empty, n, c)))
adamc@175 1092 (enumerateCases t)) cons
adamc@175 1093 in
adamc@175 1094 case #1 (#1 (hnormCon (env, denv) t)) of
adamc@175 1095 L'.CNamed n =>
adamc@175 1096 (let
adamc@175 1097 val dt = E.lookupDatatype env n
adamc@175 1098 val cons = E.constructors dt
adamc@175 1099 in
adamc@175 1100 dtype cons
adamc@175 1101 end handle E.UnboundNamed _ => [Wild])
adamc@175 1102 | L'.TRecord c =>
adamc@175 1103 (case #1 (#1 (hnormCon (env, denv) c)) of
adamc@175 1104 L'.CRecord (_, xts) =>
adamc@175 1105 let
adamc@175 1106 val xts = map (fn (x, t) => (#1 (hnormCon (env, denv) x), t)) xts
adamc@175 1107
adamc@175 1108 fun exponentiate fs =
adamc@175 1109 case fs of
adamc@175 1110 [] => [SM.empty]
adamc@175 1111 | ((L'.CName x, _), t) :: rest =>
adamc@175 1112 let
adamc@175 1113 val this = enumerateCases t
adamc@175 1114 val rest = exponentiate rest
adamc@175 1115 in
adamc@175 1116 ListUtil.mapConcat (fn fmap =>
adamc@175 1117 map (fn c => SM.insert (fmap, x, c)) this) rest
adamc@175 1118 end
adamc@175 1119 | _ => raise Fail "exponentiate: Not CName"
adamc@175 1120 in
adamc@175 1121 if List.exists (fn ((L'.CName _, _), _) => false
adamc@175 1122 | (c, _) => true) xts then
adamc@175 1123 [Wild]
adamc@175 1124 else
adamc@175 1125 map (fn ls => Record [ls]) (exponentiate xts)
adamc@175 1126 end
adamc@175 1127 | _ => [Wild])
adamc@175 1128 | _ => [Wild]
adamc@175 1129 end
adamc@175 1130
adamc@175 1131 fun coverageImp (c1, c2) =
adamc@175 1132 case (c1, c2) of
adamc@175 1133 (Wild, _) => true
adamc@175 1134
adamc@175 1135 | (Datatype cmap1, Datatype cmap2) =>
adamc@175 1136 List.all (fn (n, c2) =>
adamc@175 1137 case IM.find (cmap1, n) of
adamc@175 1138 NONE => false
adamc@175 1139 | SOME c1 => coverageImp (c1, c2)) (IM.listItemsi cmap2)
adamc@175 1140
adamc@175 1141 | (Record fmaps1, Record fmaps2) =>
adamc@175 1142 List.all (fn fmap2 =>
adamc@175 1143 List.exists (fn fmap1 =>
adamc@175 1144 List.all (fn (x, c2) =>
adamc@175 1145 case SM.find (fmap1, x) of
adamc@175 1146 NONE => true
adamc@175 1147 | SOME c1 => coverageImp (c1, c2))
adamc@175 1148 (SM.listItemsi fmap2))
adamc@175 1149 fmaps1) fmaps2
adamc@175 1150
adamc@175 1151 | _ => false
adamc@175 1152
adamc@172 1153 fun isTotal (c, t) =
adamc@172 1154 case c of
adamc@173 1155 None => (false, [])
adamc@173 1156 | Wild => (true, [])
adamc@172 1157 | Datatype cm =>
adamc@172 1158 let
adamc@172 1159 val ((t, _), gs) = hnormCon (env, denv) t
adamc@174 1160
adamc@174 1161 fun dtype cons =
adamc@174 1162 foldl (fn ((_, n, to), (total, gs)) =>
adamc@174 1163 case IM.find (cm, n) of
adamc@174 1164 NONE => (false, gs)
adamc@174 1165 | SOME c' =>
adamc@174 1166 case to of
adamc@174 1167 NONE => (total, gs)
adamc@174 1168 | SOME t' =>
adamc@174 1169 let
adamc@174 1170 val (total, gs') = isTotal (c', t')
adamc@174 1171 in
adamc@174 1172 (total, gs' @ gs)
adamc@174 1173 end)
adamc@174 1174 (true, gs) cons
adamc@191 1175
adamc@191 1176 fun unapp t =
adamc@191 1177 case t of
adamc@191 1178 L'.CApp ((t, _), _) => unapp t
adamc@191 1179 | _ => t
adamc@172 1180 in
adamc@191 1181 case unapp t of
adamc@172 1182 L'.CNamed n =>
adamc@172 1183 let
adamc@172 1184 val dt = E.lookupDatatype env n
adamc@172 1185 val cons = E.constructors dt
adamc@172 1186 in
adamc@174 1187 dtype cons
adamc@174 1188 end
adamc@174 1189 | L'.CModProj (m1, ms, x) =>
adamc@174 1190 let
adamc@174 1191 val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@174 1192 in
adamc@174 1193 case E.projectDatatype env {str = str, sgn = sgn, field = x} of
adamc@174 1194 NONE => raise Fail "isTotal: Can't project datatype"
adamc@191 1195 | SOME (_, cons) => dtype cons
adamc@172 1196 end
adamc@172 1197 | L'.CError => (true, gs)
adamc@172 1198 | _ => raise Fail "isTotal: Not a datatype"
adamc@172 1199 end
adamc@175 1200 | Record _ => (List.all (fn c2 => coverageImp (c, c2)) (enumerateCases t), [])
adamc@172 1201 in
adamc@172 1202 isTotal (combinedCoverage ps, t)
adamc@172 1203 end
adamc@172 1204
adamc@92 1205 fun elabExp (env, denv) (eAll as (e, loc)) =
adamc@91 1206 let
adamc@92 1207
adamc@92 1208 in
adamc@92 1209 (*eprefaces "elabExp" [("eAll", SourcePrint.p_exp eAll)];*)
adamc@10 1210
adamc@91 1211 case e of
adamc@91 1212 L.EAnnot (e, t) =>
adamc@91 1213 let
adamc@91 1214 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1215 val (t', _, gs2) = elabCon (env, denv) t
adamc@91 1216 val gs3 = checkCon (env, denv) e' et t'
adamc@91 1217 in
adamc@91 1218 (e', t', gs1 @ gs2 @ gs3)
adamc@91 1219 end
adamc@34 1220
adamc@91 1221 | L.EPrim p => ((L'.EPrim p, loc), primType env p, [])
adamc@91 1222 | L.EVar ([], s) =>
adamc@91 1223 (case E.lookupE env s of
adamc@91 1224 E.NotBound =>
adamc@91 1225 (expError env (UnboundExp (loc, s));
adamc@91 1226 (eerror, cerror, []))
adamc@91 1227 | E.Rel (n, t) => ((L'.ERel n, loc), t, [])
adamc@191 1228 | E.Named (n, t) =>
adamc@191 1229 if Char.isUpper (String.sub (s, 0)) then
adamc@191 1230 elabHead (env, denv) (L'.ENamed n, loc) t
adamc@191 1231 else
adamc@191 1232 ((L'.ENamed n, loc), t, []))
adamc@91 1233 | L.EVar (m1 :: ms, s) =>
adamc@91 1234 (case E.lookupStr env m1 of
adamc@91 1235 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@91 1236 (eerror, cerror, []))
adamc@91 1237 | SOME (n, sgn) =>
adamc@91 1238 let
adamc@91 1239 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@91 1240 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@91 1241 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@91 1242 (strerror, sgnerror))
adamc@91 1243 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@91 1244 ((L'.StrVar n, loc), sgn) ms
adamc@10 1245
adamc@91 1246 val t = case E.projectVal env {sgn = sgn, str = str, field = s} of
adamc@91 1247 NONE => (expError env (UnboundExp (loc, s));
adamc@91 1248 cerror)
adamc@91 1249 | SOME t => t
adamc@91 1250 in
adamc@91 1251 ((L'.EModProj (n, ms, s), loc), t, [])
adamc@91 1252 end)
adamc@86 1253
adamc@91 1254 | L.EApp (e1, e2) =>
adamc@91 1255 let
adamc@91 1256 val (e1', t1, gs1) = elabExp (env, denv) e1
adamc@91 1257 val (e1', t1, gs2) = elabHead (env, denv) e1' t1
adamc@91 1258 val (e2', t2, gs3) = elabExp (env, denv) e2
adamc@71 1259
adamc@91 1260 val dom = cunif (loc, ktype)
adamc@91 1261 val ran = cunif (loc, ktype)
adamc@91 1262 val t = (L'.TFun (dom, ran), dummy)
adamc@91 1263
adamc@91 1264 val gs4 = checkCon (env, denv) e1' t1 t
adamc@91 1265 val gs5 = checkCon (env, denv) e2' t2 dom
adamc@91 1266 in
adamc@91 1267 ((L'.EApp (e1', e2'), loc), ran, gs1 @ gs2 @ gs3 @ gs4 @ gs5)
adamc@91 1268 end
adamc@91 1269 | L.EAbs (x, to, e) =>
adamc@91 1270 let
adamc@91 1271 val (t', gs1) = case to of
adamc@91 1272 NONE => (cunif (loc, ktype), [])
adamc@91 1273 | SOME t =>
adamc@91 1274 let
adamc@91 1275 val (t', tk, gs) = elabCon (env, denv) t
adamc@91 1276 in
adamc@91 1277 checkKind env t' tk ktype;
adamc@91 1278 (t', gs)
adamc@91 1279 end
adamc@91 1280 val (e', et, gs2) = elabExp (E.pushERel env x t', denv) e
adamc@91 1281 in
adamc@91 1282 ((L'.EAbs (x, t', et, e'), loc),
adamc@91 1283 (L'.TFun (t', et), loc),
adamc@91 1284 gs1 @ gs2)
adamc@91 1285 end
adamc@91 1286 | L.ECApp (e, c) =>
adamc@91 1287 let
adamc@91 1288 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1289 val (e', et, gs2) = elabHead (env, denv) e' et
adamc@91 1290 val (c', ck, gs3) = elabCon (env, denv) c
adamc@91 1291 val ((et', _), gs4) = hnormCon (env, denv) et
adamc@91 1292 in
adamc@91 1293 case et' of
adamc@91 1294 L'.CError => (eerror, cerror, [])
adamc@91 1295 | L'.TCFun (_, _, k, eb) =>
adamc@91 1296 let
adamc@91 1297 val () = checkKind env c' ck k
adamc@91 1298 val eb' = subConInCon (0, c') eb
adamc@91 1299 handle SynUnif => (expError env (Unif ("substitution", eb));
adamc@91 1300 cerror)
adamc@91 1301 in
adamc@91 1302 ((L'.ECApp (e', c'), loc), eb', gs1 @ gs2 @ gs3 @ gs4)
adamc@91 1303 end
adamc@91 1304
adamc@91 1305 | L'.CUnif _ =>
adamc@91 1306 (expError env (Unif ("application", et));
adamc@91 1307 (eerror, cerror, []))
adamc@91 1308
adamc@91 1309 | _ =>
adamc@91 1310 (expError env (WrongForm ("constructor function", e', et));
adamc@91 1311 (eerror, cerror, []))
adamc@91 1312 end
adamc@91 1313 | L.ECAbs (expl, x, k, e) =>
adamc@91 1314 let
adamc@91 1315 val expl' = elabExplicitness expl
adamc@91 1316 val k' = elabKind k
adamc@91 1317 val (e', et, gs) = elabExp (E.pushCRel env x k', D.enter denv) e
adamc@91 1318 in
adamc@91 1319 ((L'.ECAbs (expl', x, k', e'), loc),
adamc@91 1320 (L'.TCFun (expl', x, k', et), loc),
adamc@91 1321 gs)
adamc@91 1322 end
adamc@91 1323
adamc@91 1324 | L.EDisjoint (c1, c2, e) =>
adamc@91 1325 let
adamc@91 1326 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@91 1327 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@91 1328
adamc@91 1329 val ku1 = kunif loc
adamc@91 1330 val ku2 = kunif loc
adamc@91 1331
adamc@91 1332 val (denv', gs3) = D.assert env denv (c1', c2')
adamc@91 1333 val (e', t, gs4) = elabExp (env, denv') e
adamc@91 1334 in
adamc@91 1335 checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@91 1336 checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@91 1337
adamc@91 1338 (e', (L'.TDisjoint (c1', c2', t), loc), gs1 @ gs2 @ gs3 @ gs4)
adamc@91 1339 end
adamc@91 1340
adamc@91 1341 | L.ERecord xes =>
adamc@91 1342 let
adamc@91 1343 val (xes', gs) = ListUtil.foldlMap (fn ((x, e), gs) =>
adamc@91 1344 let
adamc@91 1345 val (x', xk, gs1) = elabCon (env, denv) x
adamc@91 1346 val (e', et, gs2) = elabExp (env, denv) e
adamc@91 1347 in
adamc@91 1348 checkKind env x' xk kname;
adamc@91 1349 ((x', e', et), gs1 @ gs2 @ gs)
adamc@91 1350 end)
adamc@91 1351 [] xes
adamc@91 1352
adamc@91 1353 val k = (L'.KType, loc)
adamc@91 1354
adamc@91 1355 fun prove (xets, gs) =
adamc@91 1356 case xets of
adamc@91 1357 [] => gs
adamc@91 1358 | (x, _, t) :: rest =>
adamc@91 1359 let
adamc@91 1360 val xc = (x, t)
adamc@91 1361 val r1 = (L'.CRecord (k, [xc]), loc)
adamc@91 1362 val gs = foldl (fn ((x', _, t'), gs) =>
adamc@91 1363 let
adamc@91 1364 val xc' = (x', t')
adamc@91 1365 val r2 = (L'.CRecord (k, [xc']), loc)
adamc@91 1366 in
adamc@91 1367 D.prove env denv (r1, r2, loc) @ gs
adamc@91 1368 end)
adamc@91 1369 gs rest
adamc@91 1370 in
adamc@91 1371 prove (rest, gs)
adamc@91 1372 end
adamc@91 1373 in
adamc@91 1374 ((L'.ERecord xes', loc),
adamc@91 1375 (L'.TRecord (L'.CRecord (ktype, map (fn (x', _, et) => (x', et)) xes'), loc), loc),
adamc@91 1376 prove (xes', gs))
adamc@91 1377 end
adamc@91 1378
adamc@91 1379 | L.EField (e, c) =>
adamc@91 1380 let
adamc@91 1381 val (e', et, gs1) = elabExp (env, denv) e
adamc@91 1382 val (c', ck, gs2) = elabCon (env, denv) c
adamc@91 1383
adamc@91 1384 val ft = cunif (loc, ktype)
adamc@91 1385 val rest = cunif (loc, ktype_record)
adamc@91 1386 val first = (L'.CRecord (ktype, [(c', ft)]), loc)
adamc@91 1387
adamc@91 1388 val gs3 =
adamc@91 1389 checkCon (env, denv) e' et
adamc@91 1390 (L'.TRecord (L'.CConcat (first, rest), loc), loc)
adamc@91 1391 val gs4 = D.prove env denv (first, rest, loc)
adamc@91 1392 in
adamc@91 1393 ((L'.EField (e', c', {field = ft, rest = rest}), loc), ft, gs1 @ gs2 @ gs3 @ gs4)
adamc@91 1394 end
adamc@91 1395
adamc@149 1396 | L.ECut (e, c) =>
adamc@149 1397 let
adamc@149 1398 val (e', et, gs1) = elabExp (env, denv) e
adamc@149 1399 val (c', ck, gs2) = elabCon (env, denv) c
adamc@149 1400
adamc@149 1401 val ft = cunif (loc, ktype)
adamc@149 1402 val rest = cunif (loc, ktype_record)
adamc@149 1403 val first = (L'.CRecord (ktype, [(c', ft)]), loc)
adamc@149 1404
adamc@149 1405 val gs3 =
adamc@149 1406 checkCon (env, denv) e' et
adamc@149 1407 (L'.TRecord (L'.CConcat (first, rest), loc), loc)
adamc@149 1408 val gs4 = D.prove env denv (first, rest, loc)
adamc@149 1409 in
adamc@149 1410 ((L'.ECut (e', c', {field = ft, rest = rest}), loc), (L'.TRecord rest, loc), gs1 @ gs2 @ gs3 @ gs4)
adamc@149 1411 end
adamc@149 1412
adamc@91 1413 | L.EFold =>
adamc@91 1414 let
adamc@91 1415 val dom = kunif loc
adamc@91 1416 in
adamc@91 1417 ((L'.EFold dom, loc), foldType (dom, loc), [])
adamc@91 1418 end
adamc@170 1419
adamc@171 1420 | L.ECase (e, pes) =>
adamc@171 1421 let
adamc@171 1422 val (e', et, gs1) = elabExp (env, denv) e
adamc@171 1423 val result = cunif (loc, (L'.KType, loc))
adamc@171 1424 val (pes', gs) = ListUtil.foldlMap
adamc@171 1425 (fn ((p, e), gs) =>
adamc@171 1426 let
adamc@174 1427 val ((p', pt), (env, _)) = elabPat (p, (env, denv, SS.empty))
adamc@171 1428
adamc@171 1429 val gs1 = checkPatCon (env, denv) p' pt et
adamc@171 1430 val (e', et, gs2) = elabExp (env, denv) e
adamc@171 1431 val gs3 = checkCon (env, denv) e' et result
adamc@171 1432 in
adamc@171 1433 ((p', e'), gs1 @ gs2 @ gs3 @ gs)
adamc@171 1434 end)
adamc@171 1435 gs1 pes
adamc@172 1436
adamc@172 1437 val (total, gs') = exhaustive (env, denv, et, map #1 pes')
adamc@171 1438 in
adamc@172 1439 if total then
adamc@172 1440 ()
adamc@172 1441 else
adamc@172 1442 expError env (Inexhaustive loc);
adamc@172 1443
adamc@182 1444 ((L'.ECase (e', pes', {disc = et, result = result}), loc), result, gs' @ gs)
adamc@171 1445 end
adamc@91 1446 end
adamc@12 1447
adamc@12 1448
adamc@6 1449 datatype decl_error =
adamc@91 1450 KunifsRemain of L'.decl list
adamc@91 1451 | CunifsRemain of L'.decl list
adamc@91 1452
adamc@91 1453 fun lspan [] = ErrorMsg.dummySpan
adamc@91 1454 | lspan ((_, loc) :: _) = loc
adamc@6 1455
adamc@6 1456 fun declError env err =
adamc@6 1457 case err of
adamc@91 1458 KunifsRemain ds =>
adamc@91 1459 (ErrorMsg.errorAt (lspan ds) "Some kind unification variables are undetermined in declaration";
adamc@91 1460 eprefaces' [("Decl", p_list_sep PD.newline (p_decl env) ds)])
adamc@91 1461 | CunifsRemain ds =>
adamc@91 1462 (ErrorMsg.errorAt (lspan ds) "Some constructor unification variables are undetermined in declaration";
adamc@91 1463 eprefaces' [("Decl", p_list_sep PD.newline (p_decl env) ds)])
adamc@6 1464
adamc@31 1465 datatype sgn_error =
adamc@31 1466 UnboundSgn of ErrorMsg.span * string
adamc@31 1467 | UnmatchedSgi of L'.sgn_item
adamc@31 1468 | SgiWrongKind of L'.sgn_item * L'.kind * L'.sgn_item * L'.kind * kunify_error
adamc@31 1469 | SgiWrongCon of L'.sgn_item * L'.con * L'.sgn_item * L'.con * cunify_error
adamc@156 1470 | SgiMismatchedDatatypes of L'.sgn_item * L'.sgn_item * (L'.con * L'.con * cunify_error) option
adamc@41 1471 | SgnWrongForm of L'.sgn * L'.sgn
adamc@42 1472 | UnWhereable of L'.sgn * string
adamc@75 1473 | WhereWrongKind of L'.kind * L'.kind * kunify_error
adamc@58 1474 | NotIncludable of L'.sgn
adamc@62 1475 | DuplicateCon of ErrorMsg.span * string
adamc@62 1476 | DuplicateVal of ErrorMsg.span * string
adamc@62 1477 | DuplicateSgn of ErrorMsg.span * string
adamc@62 1478 | DuplicateStr of ErrorMsg.span * string
adamc@88 1479 | NotConstraintsable of L'.sgn
adamc@31 1480
adamc@31 1481 fun sgnError env err =
adamc@31 1482 case err of
adamc@31 1483 UnboundSgn (loc, s) =>
adamc@31 1484 ErrorMsg.errorAt loc ("Unbound signature variable " ^ s)
adamc@31 1485 | UnmatchedSgi (sgi as (_, loc)) =>
adamc@31 1486 (ErrorMsg.errorAt loc "Unmatched signature item";
adamc@31 1487 eprefaces' [("Item", p_sgn_item env sgi)])
adamc@31 1488 | SgiWrongKind (sgi1, k1, sgi2, k2, kerr) =>
adamc@31 1489 (ErrorMsg.errorAt (#2 sgi1) "Kind unification failure in signature matching:";
adamc@59 1490 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59 1491 ("Need", p_sgn_item env sgi2),
adamc@31 1492 ("Kind 1", p_kind k1),
adamc@31 1493 ("Kind 2", p_kind k2)];
adamc@31 1494 kunifyError kerr)
adamc@31 1495 | SgiWrongCon (sgi1, c1, sgi2, c2, cerr) =>
adamc@31 1496 (ErrorMsg.errorAt (#2 sgi1) "Constructor unification failure in signature matching:";
adamc@59 1497 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59 1498 ("Need", p_sgn_item env sgi2),
adamc@31 1499 ("Con 1", p_con env c1),
adamc@31 1500 ("Con 2", p_con env c2)];
adamc@31 1501 cunifyError env cerr)
adamc@156 1502 | SgiMismatchedDatatypes (sgi1, sgi2, cerro) =>
adamc@156 1503 (ErrorMsg.errorAt (#2 sgi1) "Mismatched 'datatype' specifications:";
adamc@156 1504 eprefaces' [("Have", p_sgn_item env sgi1),
adamc@156 1505 ("Need", p_sgn_item env sgi2)];
adamc@156 1506 Option.app (fn (c1, c2, ue) =>
adamc@156 1507 (eprefaces "Unification error"
adamc@156 1508 [("Con 1", p_con env c1),
adamc@156 1509 ("Con 2", p_con env c2)];
adamc@156 1510 cunifyError env ue)) cerro)
adamc@41 1511 | SgnWrongForm (sgn1, sgn2) =>
adamc@41 1512 (ErrorMsg.errorAt (#2 sgn1) "Incompatible signatures:";
adamc@41 1513 eprefaces' [("Sig 1", p_sgn env sgn1),
adamc@41 1514 ("Sig 2", p_sgn env sgn2)])
adamc@42 1515 | UnWhereable (sgn, x) =>
adamc@42 1516 (ErrorMsg.errorAt (#2 sgn) "Unavailable field for 'where'";
adamc@42 1517 eprefaces' [("Signature", p_sgn env sgn),
adamc@42 1518 ("Field", PD.string x)])
adamc@75 1519 | WhereWrongKind (k1, k2, kerr) =>
adamc@75 1520 (ErrorMsg.errorAt (#2 k1) "Wrong kind for 'where'";
adamc@75 1521 eprefaces' [("Have", p_kind k1),
adamc@75 1522 ("Need", p_kind k2)];
adamc@75 1523 kunifyError kerr)
adamc@58 1524 | NotIncludable sgn =>
adamc@58 1525 (ErrorMsg.errorAt (#2 sgn) "Invalid signature to 'include'";
adamc@58 1526 eprefaces' [("Signature", p_sgn env sgn)])
adamc@62 1527 | DuplicateCon (loc, s) =>
adamc@62 1528 ErrorMsg.errorAt loc ("Duplicate constructor " ^ s ^ " in signature")
adamc@62 1529 | DuplicateVal (loc, s) =>
adamc@62 1530 ErrorMsg.errorAt loc ("Duplicate value " ^ s ^ " in signature")
adamc@62 1531 | DuplicateSgn (loc, s) =>
adamc@62 1532 ErrorMsg.errorAt loc ("Duplicate signature " ^ s ^ " in signature")
adamc@62 1533 | DuplicateStr (loc, s) =>
adamc@62 1534 ErrorMsg.errorAt loc ("Duplicate structure " ^ s ^ " in signature")
adamc@88 1535 | NotConstraintsable sgn =>
adamc@88 1536 (ErrorMsg.errorAt (#2 sgn) "Invalid signature for 'open constraints'";
adamc@88 1537 eprefaces' [("Signature", p_sgn env sgn)])
adamc@31 1538
adamc@31 1539 datatype str_error =
adamc@31 1540 UnboundStr of ErrorMsg.span * string
adamc@44 1541 | NotFunctor of L'.sgn
adamc@46 1542 | FunctorRebind of ErrorMsg.span
adamc@61 1543 | UnOpenable of L'.sgn
adamc@75 1544 | NotType of L'.kind * (L'.kind * L'.kind * kunify_error)
adamc@156 1545 | DuplicateConstructor of string * ErrorMsg.span
adamc@158 1546 | NotDatatype of ErrorMsg.span
adamc@31 1547
adamc@31 1548 fun strError env err =
adamc@31 1549 case err of
adamc@31 1550 UnboundStr (loc, s) =>
adamc@31 1551 ErrorMsg.errorAt loc ("Unbound structure variable " ^ s)
adamc@44 1552 | NotFunctor sgn =>
adamc@44 1553 (ErrorMsg.errorAt (#2 sgn) "Application of non-functor";
adamc@44 1554 eprefaces' [("Signature", p_sgn env sgn)])
adamc@46 1555 | FunctorRebind loc =>
adamc@46 1556 ErrorMsg.errorAt loc "Attempt to rebind functor"
adamc@61 1557 | UnOpenable sgn =>
adamc@61 1558 (ErrorMsg.errorAt (#2 sgn) "Un-openable structure";
adamc@61 1559 eprefaces' [("Signature", p_sgn env sgn)])
adamc@75 1560 | NotType (k, (k1, k2, ue)) =>
adamc@75 1561 (ErrorMsg.errorAt (#2 k) "'val' type kind is not 'Type'";
adamc@75 1562 eprefaces' [("Kind", p_kind k),
adamc@75 1563 ("Subkind 1", p_kind k1),
adamc@75 1564 ("Subkind 2", p_kind k2)];
adamc@75 1565 kunifyError ue)
adamc@156 1566 | DuplicateConstructor (x, loc) =>
adamc@156 1567 ErrorMsg.errorAt loc ("Duplicate datatype constructor " ^ x)
adamc@158 1568 | NotDatatype loc =>
adamc@158 1569 ErrorMsg.errorAt loc "Trying to import non-datatype as a datatype"
adamc@31 1570
adamc@42 1571 val hnormSgn = E.hnormSgn
adamc@31 1572
adamc@88 1573 fun elabSgn_item ((sgi, loc), (env, denv, gs)) =
adamc@76 1574 case sgi of
adamc@76 1575 L.SgiConAbs (x, k) =>
adamc@76 1576 let
adamc@76 1577 val k' = elabKind k
adamc@31 1578
adamc@76 1579 val (env', n) = E.pushCNamed env x k' NONE
adamc@76 1580 in
adamc@88 1581 ([(L'.SgiConAbs (x, n, k'), loc)], (env', denv, gs))
adamc@76 1582 end
adamc@31 1583
adamc@76 1584 | L.SgiCon (x, ko, c) =>
adamc@76 1585 let
adamc@76 1586 val k' = case ko of
adamc@76 1587 NONE => kunif loc
adamc@76 1588 | SOME k => elabKind k
adamc@31 1589
adamc@83 1590 val (c', ck, gs') = elabCon (env, denv) c
adamc@76 1591 val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@76 1592 in
adamc@76 1593 checkKind env c' ck k';
adamc@31 1594
adamc@88 1595 ([(L'.SgiCon (x, n, k', c'), loc)], (env', denv, gs' @ gs))
adamc@76 1596 end
adamc@31 1597
adamc@191 1598 | L.SgiDatatype (x, xs, xcs) =>
adamc@157 1599 let
adamc@157 1600 val k = (L'.KType, loc)
adamc@191 1601 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 1602 val (env, n) = E.pushCNamed env x k' NONE
adamc@157 1603 val t = (L'.CNamed n, loc)
adamc@194 1604 val nxs = length xs - 1
adamc@194 1605 val t = ListUtil.foldli (fn (i, _, t) => (L'.CApp (t, (L'.CRel (nxs - i), loc)), loc)) t xs
adamc@157 1606
adamc@157 1607 val (xcs, (used, env, gs)) =
adamc@157 1608 ListUtil.foldlMap
adamc@157 1609 (fn ((x, to), (used, env, gs)) =>
adamc@157 1610 let
adamc@157 1611 val (to, t, gs') = case to of
adamc@157 1612 NONE => (NONE, t, gs)
adamc@157 1613 | SOME t' =>
adamc@157 1614 let
adamc@157 1615 val (t', tk, gs') = elabCon (env, denv) t'
adamc@157 1616 in
adamc@157 1617 checkKind env t' tk k;
adamc@157 1618 (SOME t', (L'.TFun (t', t), loc), gs' @ gs)
adamc@157 1619 end
adamc@191 1620 val t = foldl (fn (x, t) => (L'.TCFun (L'.Implicit, x, k, t), loc)) t xs
adamc@157 1621
adamc@157 1622 val (env, n') = E.pushENamed env x t
adamc@157 1623 in
adamc@157 1624 if SS.member (used, x) then
adamc@157 1625 strError env (DuplicateConstructor (x, loc))
adamc@157 1626 else
adamc@157 1627 ();
adamc@157 1628 ((x, n', to), (SS.add (used, x), env, gs'))
adamc@157 1629 end)
adamc@157 1630 (SS.empty, env, []) xcs
adamc@191 1631
adamc@191 1632 val env = E.pushDatatype env n xs xcs
adamc@157 1633 in
adamc@191 1634 ([(L'.SgiDatatype (x, n, xs, xcs), loc)], (env, denv, gs))
adamc@157 1635 end
adamc@156 1636
adamc@158 1637 | L.SgiDatatypeImp (_, [], _) => raise Fail "Empty SgiDatatypeImp"
adamc@158 1638
adamc@158 1639 | L.SgiDatatypeImp (x, m1 :: ms, s) =>
adamc@158 1640 (case E.lookupStr env m1 of
adamc@158 1641 NONE => (strError env (UnboundStr (loc, m1));
adamc@158 1642 ([], (env, denv, gs)))
adamc@158 1643 | SOME (n, sgn) =>
adamc@158 1644 let
adamc@158 1645 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@158 1646 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@158 1647 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@158 1648 (strerror, sgnerror))
adamc@158 1649 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@158 1650 ((L'.StrVar n, loc), sgn) ms
adamc@158 1651 in
adamc@161 1652 case hnormCon (env, denv) (L'.CModProj (n, ms, s), loc) of
adamc@161 1653 ((L'.CModProj (n, ms, s), _), gs) =>
adamc@161 1654 (case E.projectDatatype env {sgn = sgn, str = str, field = s} of
adamc@161 1655 NONE => (conError env (UnboundDatatype (loc, s));
adamc@161 1656 ([], (env, denv, gs)))
adamc@191 1657 | SOME (xs, xncs) =>
adamc@161 1658 let
adamc@161 1659 val k = (L'.KType, loc)
adamc@191 1660 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 1661
adamc@161 1662 val t = (L'.CModProj (n, ms, s), loc)
adamc@191 1663 val (env, n') = E.pushCNamed env x k' (SOME t)
adamc@191 1664 val env = E.pushDatatype env n' xs xncs
adamc@158 1665
adamc@161 1666 val t = (L'.CNamed n', loc)
adamc@161 1667 val env = foldl (fn ((x, n, to), env) =>
adamc@161 1668 let
adamc@161 1669 val t = case to of
adamc@161 1670 NONE => t
adamc@161 1671 | SOME t' => (L'.TFun (t', t), loc)
adamc@191 1672
adamc@191 1673 val t = foldr (fn (x, t) =>
adamc@191 1674 (L'.TCFun (L'.Implicit, x, k, t), loc))
adamc@191 1675 t xs
adamc@161 1676 in
adamc@161 1677 E.pushENamedAs env x n t
adamc@161 1678 end) env xncs
adamc@161 1679 in
adamc@191 1680 ([(L'.SgiDatatypeImp (x, n', n, ms, s, xs, xncs), loc)], (env, denv, gs))
adamc@161 1681 end)
adamc@161 1682 | _ => (strError env (NotDatatype loc);
adamc@161 1683 ([], (env, denv, [])))
adamc@158 1684 end)
adamc@156 1685
adamc@76 1686 | L.SgiVal (x, c) =>
adamc@76 1687 let
adamc@83 1688 val (c', ck, gs') = elabCon (env, denv) c
adamc@31 1689
adamc@76 1690 val (env', n) = E.pushENamed env x c'
adamc@76 1691 in
adamc@76 1692 (unifyKinds ck ktype
adamc@76 1693 handle KUnify ue => strError env (NotType (ck, ue)));
adamc@31 1694
adamc@88 1695 ([(L'.SgiVal (x, n, c'), loc)], (env', denv, gs' @ gs))
adamc@76 1696 end
adamc@31 1697
adamc@76 1698 | L.SgiStr (x, sgn) =>
adamc@76 1699 let
adamc@83 1700 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 1701 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 1702 in
adamc@88 1703 ([(L'.SgiStr (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 1704 end
adamc@31 1705
adamc@76 1706 | L.SgiSgn (x, sgn) =>
adamc@76 1707 let
adamc@83 1708 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 1709 val (env', n) = E.pushSgnNamed env x sgn'
adamc@76 1710 in
adamc@88 1711 ([(L'.SgiSgn (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 1712 end
adamc@31 1713
adamc@76 1714 | L.SgiInclude sgn =>
adamc@76 1715 let
adamc@83 1716 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 1717 in
adamc@76 1718 case #1 (hnormSgn env sgn') of
adamc@76 1719 L'.SgnConst sgis =>
adamc@88 1720 (sgis, (foldl (fn (sgi, env) => E.sgiBinds env sgi) env sgis, denv, gs' @ gs))
adamc@76 1721 | _ => (sgnError env (NotIncludable sgn');
adamc@88 1722 ([], (env, denv, [])))
adamc@88 1723 end
adamc@88 1724
adamc@88 1725 | L.SgiConstraint (c1, c2) =>
adamc@88 1726 let
adamc@88 1727 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@88 1728 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@88 1729
adamc@90 1730 val (denv, gs3) = D.assert env denv (c1', c2')
adamc@88 1731 in
adamc@88 1732 checkKind env c1' k1 (L'.KRecord (kunif loc), loc);
adamc@88 1733 checkKind env c2' k2 (L'.KRecord (kunif loc), loc);
adamc@88 1734
adamc@90 1735 ([(L'.SgiConstraint (c1', c2'), loc)], (env, denv, gs1 @ gs2 @ gs3))
adamc@76 1736 end
adamc@31 1737
adamc@83 1738 and elabSgn (env, denv) (sgn, loc) =
adamc@31 1739 case sgn of
adamc@31 1740 L.SgnConst sgis =>
adamc@31 1741 let
adamc@88 1742 val (sgis', (_, _, gs)) = ListUtil.foldlMapConcat elabSgn_item (env, denv, []) sgis
adamc@62 1743
adamc@62 1744 val _ = foldl (fn ((sgi, loc), (cons, vals, sgns, strs)) =>
adamc@62 1745 case sgi of
adamc@62 1746 L'.SgiConAbs (x, _, _) =>
adamc@62 1747 (if SS.member (cons, x) then
adamc@62 1748 sgnError env (DuplicateCon (loc, x))
adamc@62 1749 else
adamc@62 1750 ();
adamc@62 1751 (SS.add (cons, x), vals, sgns, strs))
adamc@62 1752 | L'.SgiCon (x, _, _, _) =>
adamc@62 1753 (if SS.member (cons, x) then
adamc@62 1754 sgnError env (DuplicateCon (loc, x))
adamc@62 1755 else
adamc@62 1756 ();
adamc@62 1757 (SS.add (cons, x), vals, sgns, strs))
adamc@191 1758 | L'.SgiDatatype (x, _, _, xncs) =>
adamc@156 1759 let
adamc@156 1760 val vals = foldl (fn ((x, _, _), vals) =>
adamc@156 1761 (if SS.member (vals, x) then
adamc@156 1762 sgnError env (DuplicateVal (loc, x))
adamc@156 1763 else
adamc@156 1764 ();
adamc@156 1765 SS.add (vals, x)))
adamc@156 1766 vals xncs
adamc@156 1767 in
adamc@156 1768 if SS.member (cons, x) then
adamc@156 1769 sgnError env (DuplicateCon (loc, x))
adamc@156 1770 else
adamc@156 1771 ();
adamc@156 1772 (SS.add (cons, x), vals, sgns, strs)
adamc@156 1773 end
adamc@191 1774 | L'.SgiDatatypeImp (x, _, _, _, _, _, _) =>
adamc@156 1775 (if SS.member (cons, x) then
adamc@156 1776 sgnError env (DuplicateCon (loc, x))
adamc@156 1777 else
adamc@156 1778 ();
adamc@156 1779 (SS.add (cons, x), vals, sgns, strs))
adamc@62 1780 | L'.SgiVal (x, _, _) =>
adamc@62 1781 (if SS.member (vals, x) then
adamc@62 1782 sgnError env (DuplicateVal (loc, x))
adamc@62 1783 else
adamc@62 1784 ();
adamc@62 1785 (cons, SS.add (vals, x), sgns, strs))
adamc@62 1786 | L'.SgiSgn (x, _, _) =>
adamc@62 1787 (if SS.member (sgns, x) then
adamc@62 1788 sgnError env (DuplicateSgn (loc, x))
adamc@62 1789 else
adamc@62 1790 ();
adamc@62 1791 (cons, vals, SS.add (sgns, x), strs))
adamc@62 1792 | L'.SgiStr (x, _, _) =>
adamc@62 1793 (if SS.member (strs, x) then
adamc@62 1794 sgnError env (DuplicateStr (loc, x))
adamc@62 1795 else
adamc@62 1796 ();
adamc@88 1797 (cons, vals, sgns, SS.add (strs, x)))
adamc@88 1798 | L'.SgiConstraint _ => (cons, vals, sgns, strs))
adamc@62 1799 (SS.empty, SS.empty, SS.empty, SS.empty) sgis'
adamc@31 1800 in
adamc@83 1801 ((L'.SgnConst sgis', loc), gs)
adamc@31 1802 end
adamc@31 1803 | L.SgnVar x =>
adamc@31 1804 (case E.lookupSgn env x of
adamc@31 1805 NONE =>
adamc@31 1806 (sgnError env (UnboundSgn (loc, x));
adamc@83 1807 ((L'.SgnError, loc), []))
adamc@83 1808 | SOME (n, sgis) => ((L'.SgnVar n, loc), []))
adamc@41 1809 | L.SgnFun (m, dom, ran) =>
adamc@41 1810 let
adamc@83 1811 val (dom', gs1) = elabSgn (env, denv) dom
adamc@41 1812 val (env', n) = E.pushStrNamed env m dom'
adamc@83 1813 val (ran', gs2) = elabSgn (env', denv) ran
adamc@41 1814 in
adamc@83 1815 ((L'.SgnFun (m, n, dom', ran'), loc), gs1 @ gs2)
adamc@41 1816 end
adamc@42 1817 | L.SgnWhere (sgn, x, c) =>
adamc@42 1818 let
adamc@83 1819 val (sgn', ds1) = elabSgn (env, denv) sgn
adamc@83 1820 val (c', ck, ds2) = elabCon (env, denv) c
adamc@42 1821 in
adamc@42 1822 case #1 (hnormSgn env sgn') of
adamc@83 1823 L'.SgnError => (sgnerror, [])
adamc@42 1824 | L'.SgnConst sgis =>
adamc@75 1825 if List.exists (fn (L'.SgiConAbs (x', _, k), _) =>
adamc@75 1826 x' = x andalso
adamc@75 1827 (unifyKinds k ck
adamc@75 1828 handle KUnify x => sgnError env (WhereWrongKind x);
adamc@42 1829 true)
adamc@42 1830 | _ => false) sgis then
adamc@83 1831 ((L'.SgnWhere (sgn', x, c'), loc), ds1 @ ds2)
adamc@42 1832 else
adamc@42 1833 (sgnError env (UnWhereable (sgn', x));
adamc@83 1834 (sgnerror, []))
adamc@42 1835 | _ => (sgnError env (UnWhereable (sgn', x));
adamc@83 1836 (sgnerror, []))
adamc@42 1837 end
adamc@59 1838 | L.SgnProj (m, ms, x) =>
adamc@59 1839 (case E.lookupStr env m of
adamc@59 1840 NONE => (strError env (UnboundStr (loc, m));
adamc@83 1841 (sgnerror, []))
adamc@59 1842 | SOME (n, sgn) =>
adamc@59 1843 let
adamc@59 1844 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@59 1845 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@59 1846 NONE => (strError env (UnboundStr (loc, m));
adamc@59 1847 (strerror, sgnerror))
adamc@59 1848 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@59 1849 ((L'.StrVar n, loc), sgn) ms
adamc@59 1850 in
adamc@59 1851 case E.projectSgn env {sgn = sgn, str = str, field = x} of
adamc@59 1852 NONE => (sgnError env (UnboundSgn (loc, x));
adamc@83 1853 (sgnerror, []))
adamc@83 1854 | SOME _ => ((L'.SgnProj (n, ms, x), loc), [])
adamc@59 1855 end)
adamc@59 1856
adamc@31 1857
adamc@66 1858 fun selfify env {str, strs, sgn} =
adamc@66 1859 case #1 (hnormSgn env sgn) of
adamc@66 1860 L'.SgnError => sgn
adamc@66 1861 | L'.SgnVar _ => sgn
adamc@66 1862
adamc@66 1863 | L'.SgnConst sgis =>
adamc@66 1864 (L'.SgnConst (map (fn (L'.SgiConAbs (x, n, k), loc) =>
adamc@66 1865 (L'.SgiCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc)
adamc@191 1866 | (L'.SgiDatatype (x, n, xs, xncs), loc) =>
adamc@191 1867 (L'.SgiDatatypeImp (x, n, str, strs, x, xs, xncs), loc)
adamc@66 1868 | (L'.SgiStr (x, n, sgn), loc) =>
adamc@66 1869 (L'.SgiStr (x, n, selfify env {str = str, strs = strs @ [x], sgn = sgn}), loc)
adamc@66 1870 | x => x) sgis), #2 sgn)
adamc@66 1871 | L'.SgnFun _ => sgn
adamc@66 1872 | L'.SgnWhere _ => sgn
adamc@66 1873 | L'.SgnProj (m, ms, x) =>
adamc@66 1874 case E.projectSgn env {str = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66 1875 (L'.StrVar m, #2 sgn) ms,
adamc@66 1876 sgn = #2 (E.lookupStrNamed env m),
adamc@66 1877 field = x} of
adamc@66 1878 NONE => raise Fail "Elaborate.selfify: projectSgn returns NONE"
adamc@66 1879 | SOME sgn => selfify env {str = str, strs = strs, sgn = sgn}
adamc@66 1880
adamc@66 1881 fun selfifyAt env {str, sgn} =
adamc@66 1882 let
adamc@66 1883 fun self (str, _) =
adamc@66 1884 case str of
adamc@66 1885 L'.StrVar x => SOME (x, [])
adamc@66 1886 | L'.StrProj (str, x) =>
adamc@66 1887 (case self str of
adamc@66 1888 NONE => NONE
adamc@66 1889 | SOME (m, ms) => SOME (m, ms @ [x]))
adamc@66 1890 | _ => NONE
adamc@66 1891 in
adamc@66 1892 case self str of
adamc@66 1893 NONE => sgn
adamc@66 1894 | SOME (str, strs) => selfify env {sgn = sgn, str = str, strs = strs}
adamc@66 1895 end
adamc@66 1896
adamc@88 1897 fun dopen (env, denv) {str, strs, sgn} =
adamc@66 1898 let
adamc@66 1899 val m = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66 1900 (L'.StrVar str, #2 sgn) strs
adamc@66 1901 in
adamc@66 1902 case #1 (hnormSgn env sgn) of
adamc@66 1903 L'.SgnConst sgis =>
adamc@88 1904 ListUtil.foldlMap (fn ((sgi, loc), (env', denv')) =>
adamc@162 1905 let
adamc@162 1906 val d =
adamc@162 1907 case sgi of
adamc@162 1908 L'.SgiConAbs (x, n, k) =>
adamc@162 1909 let
adamc@162 1910 val c = (L'.CModProj (str, strs, x), loc)
adamc@162 1911 in
adamc@162 1912 (L'.DCon (x, n, k, c), loc)
adamc@162 1913 end
adamc@162 1914 | L'.SgiCon (x, n, k, c) =>
adamc@162 1915 (L'.DCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc)
adamc@191 1916 | L'.SgiDatatype (x, n, xs, xncs) =>
adamc@191 1917 (L'.DDatatypeImp (x, n, str, strs, x, xs, xncs), loc)
adamc@191 1918 | L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs) =>
adamc@191 1919 (L'.DDatatypeImp (x, n, m1, ms, x', xs, xncs), loc)
adamc@162 1920 | L'.SgiVal (x, n, t) =>
adamc@162 1921 (L'.DVal (x, n, t, (L'.EModProj (str, strs, x), loc)), loc)
adamc@162 1922 | L'.SgiStr (x, n, sgn) =>
adamc@162 1923 (L'.DStr (x, n, sgn, (L'.StrProj (m, x), loc)), loc)
adamc@162 1924 | L'.SgiSgn (x, n, sgn) =>
adamc@162 1925 (L'.DSgn (x, n, (L'.SgnProj (str, strs, x), loc)), loc)
adamc@162 1926 | L'.SgiConstraint (c1, c2) =>
adamc@162 1927 (L'.DConstraint (c1, c2), loc)
adamc@162 1928 in
adamc@162 1929 (d, (E.declBinds env' d, denv'))
adamc@162 1930 end)
adamc@88 1931 (env, denv) sgis
adamc@66 1932 | _ => (strError env (UnOpenable sgn);
adamc@88 1933 ([], (env, denv)))
adamc@66 1934 end
adamc@66 1935
adamc@88 1936 fun dopenConstraints (loc, env, denv) {str, strs} =
adamc@88 1937 case E.lookupStr env str of
adamc@88 1938 NONE => (strError env (UnboundStr (loc, str));
adamc@88 1939 denv)
adamc@88 1940 | SOME (n, sgn) =>
adamc@88 1941 let
adamc@88 1942 val (st, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@88 1943 case E.projectStr env {str = str, sgn = sgn, field = m} of
adamc@88 1944 NONE => (strError env (UnboundStr (loc, m));
adamc@88 1945 (strerror, sgnerror))
adamc@88 1946 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@88 1947 ((L'.StrVar n, loc), sgn) strs
adamc@88 1948
adamc@88 1949 val cso = E.projectConstraints env {sgn = sgn, str = st}
adamc@88 1950
adamc@88 1951 val denv = case cso of
adamc@88 1952 NONE => (strError env (UnboundStr (loc, str));
adamc@88 1953 denv)
adamc@90 1954 | SOME cs => foldl (fn ((c1, c2), denv) =>
adamc@90 1955 let
adamc@90 1956 val (denv, gs) = D.assert env denv (c1, c2)
adamc@90 1957 in
adamc@90 1958 case gs of
adamc@90 1959 [] => ()
adamc@90 1960 | _ => raise Fail "dopenConstraints: Sub-constraints remain";
adamc@90 1961
adamc@90 1962 denv
adamc@90 1963 end) denv cs
adamc@88 1964 in
adamc@88 1965 denv
adamc@88 1966 end
adamc@88 1967
adamc@31 1968 fun sgiOfDecl (d, loc) =
adamc@31 1969 case d of
adamc@123 1970 L'.DCon (x, n, k, c) => [(L'.SgiCon (x, n, k, c), loc)]
adamc@156 1971 | L'.DDatatype x => [(L'.SgiDatatype x, loc)]
adamc@156 1972 | L'.DDatatypeImp x => [(L'.SgiDatatypeImp x, loc)]
adamc@123 1973 | L'.DVal (x, n, t, _) => [(L'.SgiVal (x, n, t), loc)]
adamc@123 1974 | L'.DValRec vis => map (fn (x, n, t, _) => (L'.SgiVal (x, n, t), loc)) vis
adamc@123 1975 | L'.DSgn (x, n, sgn) => [(L'.SgiSgn (x, n, sgn), loc)]
adamc@123 1976 | L'.DStr (x, n, sgn, _) => [(L'.SgiStr (x, n, sgn), loc)]
adamc@123 1977 | L'.DFfiStr (x, n, sgn) => [(L'.SgiStr (x, n, sgn), loc)]
adamc@123 1978 | L'.DConstraint cs => [(L'.SgiConstraint cs, loc)]
adamc@123 1979 | L'.DExport _ => []
adamc@88 1980
adamc@88 1981 fun sgiBindsD (env, denv) (sgi, _) =
adamc@88 1982 case sgi of
adamc@90 1983 L'.SgiConstraint (c1, c2) =>
adamc@90 1984 (case D.assert env denv (c1, c2) of
adamc@90 1985 (denv, []) => denv
adamc@90 1986 | _ => raise Fail "sgiBindsD: Sub-constraints remain")
adamc@88 1987 | _ => denv
adamc@31 1988
adamc@86 1989 fun subSgn (env, denv) sgn1 (sgn2 as (_, loc2)) =
adamc@35 1990 case (#1 (hnormSgn env sgn1), #1 (hnormSgn env sgn2)) of
adamc@31 1991 (L'.SgnError, _) => ()
adamc@31 1992 | (_, L'.SgnError) => ()
adamc@31 1993
adamc@31 1994 | (L'.SgnConst sgis1, L'.SgnConst sgis2) =>
adamc@31 1995 let
adamc@156 1996 fun folder (sgi2All as (sgi, loc), (env, denv)) =
adamc@31 1997 let
adamc@31 1998 fun seek p =
adamc@31 1999 let
adamc@88 2000 fun seek (env, denv) ls =
adamc@31 2001 case ls of
adamc@31 2002 [] => (sgnError env (UnmatchedSgi sgi2All);
adamc@88 2003 (env, denv))
adamc@31 2004 | h :: t =>
adamc@31 2005 case p h of
adamc@88 2006 NONE => seek (E.sgiBinds env h, sgiBindsD (env, denv) h) t
adamc@88 2007 | SOME envs => envs
adamc@31 2008 in
adamc@88 2009 seek (env, denv) sgis1
adamc@31 2010 end
adamc@31 2011 in
adamc@31 2012 case sgi of
adamc@31 2013 L'.SgiConAbs (x, n2, k2) =>
adamc@31 2014 seek (fn sgi1All as (sgi1, _) =>
adamc@31 2015 let
adamc@41 2016 fun found (x', n1, k1, co1) =
adamc@41 2017 if x = x' then
adamc@41 2018 let
adamc@41 2019 val () = unifyKinds k1 k2
adamc@41 2020 handle KUnify (k1, k2, err) =>
adamc@41 2021 sgnError env (SgiWrongKind (sgi1All, k1, sgi2All, k2, err))
adamc@41 2022 val env = E.pushCNamedAs env x n1 k1 co1
adamc@41 2023 in
adamc@41 2024 SOME (if n1 = n2 then
adamc@41 2025 env
adamc@41 2026 else
adamc@88 2027 E.pushCNamedAs env x n2 k2 (SOME (L'.CNamed n1, loc2)),
adamc@88 2028 denv)
adamc@41 2029 end
adamc@41 2030 else
adamc@41 2031 NONE
adamc@31 2032 in
adamc@31 2033 case sgi1 of
adamc@41 2034 L'.SgiConAbs (x', n1, k1) => found (x', n1, k1, NONE)
adamc@41 2035 | L'.SgiCon (x', n1, k1, c1) => found (x', n1, k1, SOME c1)
adamc@191 2036 | L'.SgiDatatype (x', n1, xs, _) =>
adamc@191 2037 let
adamc@191 2038 val k = (L'.KType, loc)
adamc@191 2039 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 2040 in
adamc@191 2041 found (x', n1, k', NONE)
adamc@191 2042 end
adamc@191 2043 | L'.SgiDatatypeImp (x', n1, m1, ms, s, xs, _) =>
adamc@191 2044 let
adamc@191 2045 val k = (L'.KType, loc)
adamc@191 2046 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 2047 in
adamc@191 2048 found (x', n1, k', SOME (L'.CModProj (m1, ms, s), loc))
adamc@191 2049 end
adamc@31 2050 | _ => NONE
adamc@31 2051 end)
adamc@31 2052
adamc@31 2053 | L'.SgiCon (x, n2, k2, c2) =>
adamc@31 2054 seek (fn sgi1All as (sgi1, _) =>
adamc@31 2055 case sgi1 of
adamc@41 2056 L'.SgiCon (x', n1, k1, c1) =>
adamc@41 2057 if x = x' then
adamc@41 2058 let
adamc@88 2059 fun good () = SOME (E.pushCNamedAs env x n2 k2 (SOME c2), denv)
adamc@41 2060 in
adamc@86 2061 (case unifyCons (env, denv) c1 c2 of
adamc@86 2062 [] => good ()
adamc@86 2063 | _ => NONE)
adamc@86 2064 handle CUnify (c1, c2, err) =>
adamc@86 2065 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@86 2066 good ())
adamc@41 2067 end
adamc@41 2068 else
adamc@41 2069 NONE
adamc@31 2070 | _ => NONE)
adamc@31 2071
adamc@191 2072 | L'.SgiDatatype (x, n2, xs2, xncs2) =>
adamc@156 2073 seek (fn sgi1All as (sgi1, _) =>
adamc@160 2074 let
adamc@191 2075 fun found (n1, xs1, xncs1) =
adamc@160 2076 let
adamc@160 2077 fun mismatched ue =
adamc@160 2078 (sgnError env (SgiMismatchedDatatypes (sgi1All, sgi2All, ue));
adamc@160 2079 SOME (env, denv))
adamc@156 2080
adamc@191 2081 val k = (L'.KType, loc)
adamc@191 2082 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs1
adamc@191 2083
adamc@160 2084 fun good () =
adamc@160 2085 let
adamc@160 2086 val env = E.sgiBinds env sgi2All
adamc@160 2087 val env = if n1 = n2 then
adamc@160 2088 env
adamc@160 2089 else
adamc@160 2090 E.pushCNamedAs env x n1 (L'.KType, loc)
adamc@160 2091 (SOME (L'.CNamed n1, loc))
adamc@160 2092 in
adamc@160 2093 SOME (env, denv)
adamc@160 2094 end
adamc@156 2095
adamc@191 2096 val env = foldl (fn (x, env) => E.pushCRel env x k) env xs1
adamc@160 2097 fun xncBad ((x1, _, t1), (x2, _, t2)) =
adamc@160 2098 String.compare (x1, x2) <> EQUAL
adamc@160 2099 orelse case (t1, t2) of
adamc@160 2100 (NONE, NONE) => false
adamc@160 2101 | (SOME t1, SOME t2) =>
adamc@160 2102 not (List.null (unifyCons (env, denv) t1 t2))
adamc@160 2103 | _ => true
adamc@160 2104 in
adamc@191 2105 (if xs1 <> xs2
adamc@191 2106 orelse length xncs1 <> length xncs2
adamc@160 2107 orelse ListPair.exists xncBad (xncs1, xncs2) then
adamc@160 2108 mismatched NONE
adamc@160 2109 else
adamc@160 2110 good ())
adamc@160 2111 handle CUnify ue => mismatched (SOME ue)
adamc@160 2112 end
adamc@160 2113 in
adamc@160 2114 case sgi1 of
adamc@191 2115 L'.SgiDatatype (x', n1, xs, xncs1) =>
adamc@160 2116 if x' = x then
adamc@191 2117 found (n1, xs, xncs1)
adamc@160 2118 else
adamc@160 2119 NONE
adamc@191 2120 | L'.SgiDatatypeImp (x', n1, _, _, _, xs, xncs1) =>
adamc@162 2121 if x' = x then
adamc@191 2122 found (n1, xs, xncs1)
adamc@162 2123 else
adamc@162 2124 NONE
adamc@160 2125 | _ => NONE
adamc@160 2126 end)
adamc@156 2127
adamc@191 2128 | L'.SgiDatatypeImp (x, n2, m12, ms2, s2, xs, _) =>
adamc@158 2129 seek (fn sgi1All as (sgi1, _) =>
adamc@158 2130 case sgi1 of
adamc@191 2131 L'.SgiDatatypeImp (x', n1, m11, ms1, s1, _, _) =>
adamc@158 2132 if x = x' then
adamc@158 2133 let
adamc@158 2134 val k = (L'.KType, loc)
adamc@191 2135 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@158 2136 val t1 = (L'.CModProj (m11, ms1, s1), loc)
adamc@158 2137 val t2 = (L'.CModProj (m12, ms2, s2), loc)
adamc@158 2138
adamc@158 2139 fun good () =
adamc@158 2140 let
adamc@191 2141 val env = E.pushCNamedAs env x n1 k' (SOME t1)
adamc@191 2142 val env = E.pushCNamedAs env x n2 k' (SOME t2)
adamc@158 2143 in
adamc@158 2144 SOME (env, denv)
adamc@158 2145 end
adamc@158 2146 in
adamc@158 2147 (case unifyCons (env, denv) t1 t2 of
adamc@158 2148 [] => good ()
adamc@158 2149 | _ => NONE)
adamc@158 2150 handle CUnify (c1, c2, err) =>
adamc@158 2151 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@158 2152 good ())
adamc@158 2153 end
adamc@158 2154 else
adamc@158 2155 NONE
adamc@158 2156
adamc@158 2157 | _ => NONE)
adamc@156 2158
adamc@32 2159 | L'.SgiVal (x, n2, c2) =>
adamc@32 2160 seek (fn sgi1All as (sgi1, _) =>
adamc@32 2161 case sgi1 of
adamc@41 2162 L'.SgiVal (x', n1, c1) =>
adamc@41 2163 if x = x' then
adamc@86 2164 (case unifyCons (env, denv) c1 c2 of
adamc@88 2165 [] => SOME (env, denv)
adamc@86 2166 | _ => NONE)
adamc@86 2167 handle CUnify (c1, c2, err) =>
adamc@86 2168 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@88 2169 SOME (env, denv))
adamc@41 2170 else
adamc@41 2171 NONE
adamc@32 2172 | _ => NONE)
adamc@32 2173
adamc@33 2174 | L'.SgiStr (x, n2, sgn2) =>
adamc@33 2175 seek (fn sgi1All as (sgi1, _) =>
adamc@33 2176 case sgi1 of
adamc@41 2177 L'.SgiStr (x', n1, sgn1) =>
adamc@41 2178 if x = x' then
adamc@66 2179 let
adamc@86 2180 val () = subSgn (env, denv) sgn1 sgn2
adamc@66 2181 val env = E.pushStrNamedAs env x n1 sgn1
adamc@66 2182 val env = if n1 = n2 then
adamc@66 2183 env
adamc@66 2184 else
adamc@66 2185 E.pushStrNamedAs env x n2
adamc@66 2186 (selfifyAt env {str = (L'.StrVar n1, #2 sgn2),
adamc@66 2187 sgn = sgn2})
adamc@66 2188 in
adamc@88 2189 SOME (env, denv)
adamc@66 2190 end
adamc@41 2191 else
adamc@41 2192 NONE
adamc@33 2193 | _ => NONE)
adamc@59 2194
adamc@59 2195 | L'.SgiSgn (x, n2, sgn2) =>
adamc@59 2196 seek (fn sgi1All as (sgi1, _) =>
adamc@59 2197 case sgi1 of
adamc@59 2198 L'.SgiSgn (x', n1, sgn1) =>
adamc@59 2199 if x = x' then
adamc@65 2200 let
adamc@86 2201 val () = subSgn (env, denv) sgn1 sgn2
adamc@86 2202 val () = subSgn (env, denv) sgn2 sgn1
adamc@65 2203
adamc@65 2204 val env = E.pushSgnNamedAs env x n2 sgn2
adamc@65 2205 val env = if n1 = n2 then
adamc@65 2206 env
adamc@65 2207 else
adamc@65 2208 E.pushSgnNamedAs env x n1 sgn2
adamc@65 2209 in
adamc@88 2210 SOME (env, denv)
adamc@65 2211 end
adamc@59 2212 else
adamc@59 2213 NONE
adamc@59 2214 | _ => NONE)
adamc@88 2215
adamc@88 2216 | L'.SgiConstraint (c2, d2) =>
adamc@88 2217 seek (fn sgi1All as (sgi1, _) =>
adamc@88 2218 case sgi1 of
adamc@88 2219 L'.SgiConstraint (c1, d1) =>
adamc@88 2220 if consEq (env, denv) (c1, c2) andalso consEq (env, denv) (d1, d2) then
adamc@90 2221 let
adamc@90 2222 val (denv, gs) = D.assert env denv (c2, d2)
adamc@90 2223 in
adamc@90 2224 case gs of
adamc@90 2225 [] => ()
adamc@90 2226 | _ => raise Fail "subSgn: Sub-constraints remain";
adamc@90 2227
adamc@90 2228 SOME (env, denv)
adamc@90 2229 end
adamc@88 2230 else
adamc@88 2231 NONE
adamc@88 2232 | _ => NONE)
adamc@31 2233 end
adamc@31 2234 in
adamc@88 2235 ignore (foldl folder (env, denv) sgis2)
adamc@31 2236 end
adamc@31 2237
adamc@41 2238 | (L'.SgnFun (m1, n1, dom1, ran1), L'.SgnFun (m2, n2, dom2, ran2)) =>
adamc@43 2239 let
adamc@43 2240 val ran1 =
adamc@43 2241 if n1 = n2 then
adamc@43 2242 ran1
adamc@43 2243 else
adamc@43 2244 subStrInSgn (n1, n2) ran1
adamc@43 2245 in
adamc@86 2246 subSgn (env, denv) dom2 dom1;
adamc@86 2247 subSgn (E.pushStrNamedAs env m2 n2 dom2, denv) ran1 ran2
adamc@43 2248 end
adamc@41 2249
adamc@41 2250 | _ => sgnError env (SgnWrongForm (sgn1, sgn2))
adamc@41 2251
adamc@61 2252
adamc@88 2253 fun elabDecl ((d, loc), (env, denv, gs)) =
adamc@76 2254 case d of
adamc@76 2255 L.DCon (x, ko, c) =>
adamc@76 2256 let
adamc@76 2257 val k' = case ko of
adamc@76 2258 NONE => kunif loc
adamc@76 2259 | SOME k => elabKind k
adamc@76 2260
adamc@83 2261 val (c', ck, gs') = elabCon (env, denv) c
adamc@76 2262 val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@76 2263 in
adamc@76 2264 checkKind env c' ck k';
adamc@76 2265
adamc@88 2266 ([(L'.DCon (x, n, k', c'), loc)], (env', denv, gs' @ gs))
adamc@76 2267 end
adamc@191 2268 | L.DDatatype (x, xs, xcs) =>
adamc@156 2269 let
adamc@156 2270 val k = (L'.KType, loc)
adamc@191 2271 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191 2272 val (env, n) = E.pushCNamed env x k' NONE
adamc@156 2273 val t = (L'.CNamed n, loc)
adamc@194 2274 val nxs = length xs - 1
adamc@194 2275 val t = ListUtil.foldli (fn (i, _, t) => (L'.CApp (t, (L'.CRel (nxs - i), loc)), loc)) t xs
adamc@191 2276
adamc@191 2277 val (env', denv') = foldl (fn (x, (env', denv')) =>
adamc@191 2278 (E.pushCRel env' x k,
adamc@191 2279 D.enter denv')) (env, denv) xs
adamc@156 2280
adamc@156 2281 val (xcs, (used, env, gs)) =
adamc@156 2282 ListUtil.foldlMap
adamc@156 2283 (fn ((x, to), (used, env, gs)) =>
adamc@156 2284 let
adamc@156 2285 val (to, t, gs') = case to of
adamc@156 2286 NONE => (NONE, t, gs)
adamc@156 2287 | SOME t' =>
adamc@156 2288 let
adamc@191 2289 val (t', tk, gs') = elabCon (env', denv') t'
adamc@156 2290 in
adamc@191 2291 checkKind env' t' tk k;
adamc@156 2292 (SOME t', (L'.TFun (t', t), loc), gs' @ gs)
adamc@156 2293 end
adamc@191 2294 val t = foldr (fn (x, t) => (L'.TCFun (L'.Implicit, x, k, t), loc)) t xs
adamc@156 2295
adamc@156 2296 val (env, n') = E.pushENamed env x t
adamc@156 2297 in
adamc@156 2298 if SS.member (used, x) then
adamc@156 2299 strError env (DuplicateConstructor (x, loc))
adamc@156 2300 else
adamc@156 2301 ();
adamc@156 2302 ((x, n', to), (SS.add (used, x), env, gs'))
adamc@156 2303 end)
adamc@156 2304 (SS.empty, env, []) xcs
adamc@171 2305
adamc@191 2306 val env = E.pushDatatype env n xs xcs
adamc@156 2307 in
adamc@191 2308 ([(L'.DDatatype (x, n, xs, xcs), loc)], (env, denv, gs))
adamc@156 2309 end
adamc@156 2310
adamc@157 2311 | L.DDatatypeImp (_, [], _) => raise Fail "Empty DDatatypeImp"
adamc@157 2312
adamc@157 2313 | L.DDatatypeImp (x, m1 :: ms, s) =>
adamc@157 2314 (case E.lookupStr env m1 of
adamc@157 2315 NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@157 2316 ([], (env, denv, gs)))
adamc@157 2317 | SOME (n, sgn) =>
adamc@157 2318 let
adamc@157 2319 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@157 2320 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@157 2321 NONE => (conError env (UnboundStrInCon (loc, m));
adamc@157 2322 (strerror, sgnerror))
adamc@157 2323 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@157 2324 ((L'.StrVar n, loc), sgn) ms
adamc@157 2325 in
adamc@158 2326 case hnormCon (env, denv) (L'.CModProj (n, ms, s), loc) of
adamc@158 2327 ((L'.CModProj (n, ms, s), _), gs) =>
adamc@158 2328 (case E.projectDatatype env {sgn = sgn, str = str, field = s} of
adamc@158 2329 NONE => (conError env (UnboundDatatype (loc, s));
adamc@158 2330 ([], (env, denv, gs)))
adamc@191 2331 | SOME (xs, xncs) =>
adamc@158 2332 let
adamc@158 2333 val k = (L'.KType, loc)
adamc@191 2334 val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@158 2335 val t = (L'.CModProj (n, ms, s), loc)
adamc@191 2336 val (env, n') = E.pushCNamed env x k' (SOME t)
adamc@191 2337 val env = E.pushDatatype env n' xs xncs
adamc@157 2338
adamc@158 2339 val t = (L'.CNamed n', loc)
adamc@158 2340 val env = foldl (fn ((x, n, to), env) =>
adamc@158 2341 let
adamc@158 2342 val t = case to of
adamc@158 2343 NONE => t
adamc@158 2344 | SOME t' => (L'.TFun (t', t), loc)
adamc@191 2345
adamc@191 2346 val t = foldr (fn (x, t) =>
adamc@191 2347 (L'.TCFun (L'.Implicit, x, k, t), loc))
adamc@191 2348 t xs
adamc@158 2349 in
adamc@158 2350 E.pushENamedAs env x n t
adamc@158 2351 end) env xncs
adamc@158 2352 in
adamc@191 2353 ([(L'.DDatatypeImp (x, n', n, ms, s, xs, xncs), loc)], (env, denv, gs))
adamc@158 2354 end)
adamc@158 2355 | _ => (strError env (NotDatatype loc);
adamc@158 2356 ([], (env, denv, [])))
adamc@157 2357 end)
adamc@157 2358
adamc@76 2359 | L.DVal (x, co, e) =>
adamc@76 2360 let
adamc@123 2361 val (c', _, gs1) = case co of
adamc@83 2362 NONE => (cunif (loc, ktype), ktype, [])
adamc@83 2363 | SOME c => elabCon (env, denv) c
adamc@76 2364
adamc@83 2365 val (e', et, gs2) = elabExp (env, denv) e
adamc@76 2366 val (env', n) = E.pushENamed env x c'
adamc@86 2367
adamc@86 2368 val gs3 = checkCon (env, denv) e' et c'
adamc@76 2369 in
adamc@88 2370 ([(L'.DVal (x, n, c', e'), loc)], (env', denv, gs1 @ gs2 @ gs3 @ gs))
adamc@76 2371 end
adamc@123 2372 | L.DValRec vis =>
adamc@123 2373 let
adamc@123 2374 val (vis, gs) = ListUtil.foldlMap
adamc@123 2375 (fn ((x, co, e), gs) =>
adamc@123 2376 let
adamc@123 2377 val (c', _, gs1) = case co of
adamc@123 2378 NONE => (cunif (loc, ktype), ktype, [])
adamc@123 2379 | SOME c => elabCon (env, denv) c
adamc@123 2380 in
adamc@123 2381 ((x, c', e), gs1 @ gs)
adamc@123 2382 end) [] vis
adamc@123 2383
adamc@123 2384 val (vis, env) = ListUtil.foldlMap (fn ((x, c', e), env) =>
adamc@123 2385 let
adamc@123 2386 val (env, n) = E.pushENamed env x c'
adamc@123 2387 in
adamc@123 2388 ((x, n, c', e), env)
adamc@123 2389 end) env vis
adamc@123 2390
adamc@123 2391 val (vis, gs) = ListUtil.foldlMap (fn ((x, n, c', e), gs) =>
adamc@123 2392 let
adamc@123 2393 val (e', et, gs1) = elabExp (env, denv) e
adamc@123 2394
adamc@123 2395 val gs2 = checkCon (env, denv) e' et c'
adamc@123 2396 in
adamc@123 2397 ((x, n, c', e'), gs1 @ gs2 @ gs)
adamc@123 2398 end) gs vis
adamc@123 2399 in
adamc@123 2400 ([(L'.DValRec vis, loc)], (env, denv, gs))
adamc@123 2401 end
adamc@76 2402
adamc@76 2403 | L.DSgn (x, sgn) =>
adamc@76 2404 let
adamc@83 2405 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2406 val (env', n) = E.pushSgnNamed env x sgn'
adamc@76 2407 in
adamc@88 2408 ([(L'.DSgn (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 2409 end
adamc@76 2410
adamc@76 2411 | L.DStr (x, sgno, str) =>
adamc@76 2412 let
adamc@93 2413 val () = if x = "Basis" then
adamc@93 2414 raise Fail "Not allowed to redefine structure 'Basis'"
adamc@93 2415 else
adamc@93 2416 ()
adamc@93 2417
adamc@83 2418 val formal = Option.map (elabSgn (env, denv)) sgno
adamc@76 2419
adamc@83 2420 val (str', sgn', gs') =
adamc@78 2421 case formal of
adamc@78 2422 NONE =>
adamc@78 2423 let
adamc@83 2424 val (str', actual, ds) = elabStr (env, denv) str
adamc@78 2425 in
adamc@83 2426 (str', selfifyAt env {str = str', sgn = actual}, ds)
adamc@78 2427 end
adamc@83 2428 | SOME (formal, gs1) =>
adamc@78 2429 let
adamc@78 2430 val str =
adamc@78 2431 case #1 (hnormSgn env formal) of
adamc@78 2432 L'.SgnConst sgis =>
adamc@78 2433 (case #1 str of
adamc@78 2434 L.StrConst ds =>
adamc@78 2435 let
adamc@78 2436 val needed = foldl (fn ((sgi, _), needed) =>
adamc@78 2437 case sgi of
adamc@78 2438 L'.SgiConAbs (x, _, _) => SS.add (needed, x)
adamc@78 2439 | _ => needed)
adamc@78 2440 SS.empty sgis
adamc@78 2441
adamc@78 2442 val needed = foldl (fn ((d, _), needed) =>
adamc@78 2443 case d of
adamc@78 2444 L.DCon (x, _, _) => (SS.delete (needed, x)
adamc@78 2445 handle NotFound => needed)
adamc@78 2446 | L.DOpen _ => SS.empty
adamc@78 2447 | _ => needed)
adamc@78 2448 needed ds
adamc@78 2449 in
adamc@78 2450 case SS.listItems needed of
adamc@78 2451 [] => str
adamc@78 2452 | xs =>
adamc@78 2453 let
adamc@78 2454 val kwild = (L.KWild, #2 str)
adamc@78 2455 val cwild = (L.CWild kwild, #2 str)
adamc@78 2456 val ds' = map (fn x => (L.DCon (x, NONE, cwild), #2 str)) xs
adamc@78 2457 in
adamc@78 2458 (L.StrConst (ds @ ds'), #2 str)
adamc@78 2459 end
adamc@78 2460 end
adamc@78 2461 | _ => str)
adamc@78 2462 | _ => str
adamc@78 2463
adamc@83 2464 val (str', actual, gs2) = elabStr (env, denv) str
adamc@78 2465 in
adamc@158 2466 subSgn (env, denv) (selfifyAt env {str = str', sgn = actual}) formal;
adamc@83 2467 (str', formal, gs1 @ gs2)
adamc@78 2468 end
adamc@76 2469
adamc@76 2470 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 2471 in
adamc@76 2472 case #1 (hnormSgn env sgn') of
adamc@76 2473 L'.SgnFun _ =>
adamc@76 2474 (case #1 str' of
adamc@76 2475 L'.StrFun _ => ()
adamc@76 2476 | _ => strError env (FunctorRebind loc))
adamc@76 2477 | _ => ();
adamc@76 2478
adamc@88 2479 ([(L'.DStr (x, n, sgn', str'), loc)], (env', denv, gs' @ gs))
adamc@76 2480 end
adamc@76 2481
adamc@76 2482 | L.DFfiStr (x, sgn) =>
adamc@76 2483 let
adamc@83 2484 val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76 2485
adamc@76 2486 val (env', n) = E.pushStrNamed env x sgn'
adamc@76 2487 in
adamc@88 2488 ([(L'.DFfiStr (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76 2489 end
adamc@76 2490
adamc@76 2491 | L.DOpen (m, ms) =>
adamc@88 2492 (case E.lookupStr env m of
adamc@88 2493 NONE => (strError env (UnboundStr (loc, m));
adamc@88 2494 ([], (env, denv, [])))
adamc@88 2495 | SOME (n, sgn) =>
adamc@88 2496 let
adamc@88 2497 val (_, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@88 2498 case E.projectStr env {str = str, sgn = sgn, field = m} of
adamc@88 2499 NONE => (strError env (UnboundStr (loc, m));
adamc@88 2500 (strerror, sgnerror))
adamc@88 2501 | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@88 2502 ((L'.StrVar n, loc), sgn) ms
adamc@83 2503
adamc@88 2504 val (ds, (env', denv')) = dopen (env, denv) {str = n, strs = ms, sgn = sgn}
adamc@88 2505 val denv' = dopenConstraints (loc, env', denv') {str = m, strs = ms}
adamc@88 2506 in
adamc@88 2507 (ds, (env', denv', []))
adamc@88 2508 end)
adamc@88 2509
adamc@88 2510 | L.DConstraint (c1, c2) =>
adamc@88 2511 let
adamc@88 2512 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@88 2513 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@90 2514 val gs3 = D.prove env denv (c1', c2', loc)
adamc@88 2515
adamc@90 2516 val (denv', gs4) = D.assert env denv (c1', c2')
adamc@88 2517 in
adamc@88 2518 checkKind env c1' k1 (L'.KRecord (kunif loc), loc);
adamc@88 2519 checkKind env c2' k2 (L'.KRecord (kunif loc), loc);
adamc@88 2520
adamc@90 2521 ([(L'.DConstraint (c1', c2'), loc)], (env, denv', gs1 @ gs2 @ gs3 @ gs4))
adamc@88 2522 end
adamc@88 2523
adamc@88 2524 | L.DOpenConstraints (m, ms) =>
adamc@88 2525 let
adamc@88 2526 val denv = dopenConstraints (loc, env, denv) {str = m, strs = ms}
adamc@88 2527 in
adamc@88 2528 ([], (env, denv, []))
adamc@88 2529 end
adamc@3 2530
adamc@109 2531 | L.DExport str =>
adamc@100 2532 let
adamc@109 2533 val (str', sgn, gs) = elabStr (env, denv) str
adamc@100 2534
adamc@109 2535 val sgn =
adamc@109 2536 case #1 (hnormSgn env sgn) of
adamc@109 2537 L'.SgnConst sgis =>
adamc@109 2538 let
adamc@146 2539 fun doOne (all as (sgi, _), env) =
adamc@146 2540 (case sgi of
adamc@146 2541 L'.SgiVal (x, n, t) =>
adamc@146 2542 (case hnormCon (env, denv) t of
adamc@146 2543 ((L'.TFun (dom, ran), _), []) =>
adamc@146 2544 (case (hnormCon (env, denv) dom, hnormCon (env, denv) ran) of
adamc@146 2545 (((L'.TRecord domR, _), []),
adamc@146 2546 ((L'.CApp (tf, arg3), _), [])) =>
adamc@146 2547 (case (hnormCon (env, denv) tf, hnormCon (env, denv) arg3) of
adamc@146 2548 (((L'.CApp (tf, arg2), _), []),
adamc@146 2549 (((L'.CRecord (_, []), _), []))) =>
adamc@146 2550 (case (hnormCon (env, denv) tf) of
adamc@146 2551 ((L'.CApp (tf, arg1), _), []) =>
adamc@146 2552 (case (hnormCon (env, denv) tf,
adamc@146 2553 hnormCon (env, denv) domR,
adamc@152 2554 hnormCon (env, denv) arg1,
adamc@146 2555 hnormCon (env, denv) arg2) of
adamc@152 2556 ((tf, []), (domR, []), (arg1, []),
adamc@146 2557 ((L'.CRecord (_, []), _), [])) =>
adamc@146 2558 let
adamc@146 2559 val t = (L'.CApp (tf, arg1), loc)
adamc@146 2560 val t = (L'.CApp (t, arg2), loc)
adamc@146 2561 val t = (L'.CApp (t, arg3), loc)
adamc@146 2562 in
adamc@146 2563 (L'.SgiVal (x, n, (L'.TFun ((L'.TRecord domR, loc),
adamc@146 2564 t),
adamc@146 2565 loc)), loc)
adamc@146 2566 end
adamc@146 2567 | _ => all)
adamc@146 2568 | _ => all)
adamc@146 2569 | _ => all)
adamc@146 2570 | _ => all)
adamc@146 2571 | _ => all)
adamc@146 2572 | _ => all,
adamc@146 2573 E.sgiBinds env all)
adamc@109 2574 in
adamc@146 2575 (L'.SgnConst (#1 (ListUtil.foldlMap doOne env sgis)), loc)
adamc@109 2576 end
adamc@109 2577 | _ => sgn
adamc@100 2578 in
adamc@109 2579 ([(L'.DExport (E.newNamed (), sgn, str'), loc)], (env, denv, gs))
adamc@100 2580 end
adamc@100 2581
adamc@83 2582 and elabStr (env, denv) (str, loc) =
adamc@31 2583 case str of
adamc@31 2584 L.StrConst ds =>
adamc@31 2585 let
adamc@88 2586 val (ds', (_, _, gs)) = ListUtil.foldlMapConcat elabDecl (env, denv, []) ds
adamc@123 2587 val sgis = ListUtil.mapConcat sgiOfDecl ds'
adamc@63 2588
adamc@63 2589 val (sgis, _, _, _, _) =
adamc@64 2590 foldr (fn ((sgi, loc), (sgis, cons, vals, sgns, strs)) =>
adamc@63 2591 case sgi of
adamc@64 2592 L'.SgiConAbs (x, n, k) =>
adamc@64 2593 let
adamc@64 2594 val (cons, x) =
adamc@64 2595 if SS.member (cons, x) then
adamc@64 2596 (cons, "?" ^ x)
adamc@64 2597 else
adamc@64 2598 (SS.add (cons, x), x)
adamc@64 2599 in
adamc@64 2600 ((L'.SgiConAbs (x, n, k), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 2601 end
adamc@64 2602 | L'.SgiCon (x, n, k, c) =>
adamc@64 2603 let
adamc@64 2604 val (cons, x) =
adamc@64 2605 if SS.member (cons, x) then
adamc@64 2606 (cons, "?" ^ x)
adamc@64 2607 else
adamc@64 2608 (SS.add (cons, x), x)
adamc@64 2609 in
adamc@64 2610 ((L'.SgiCon (x, n, k, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 2611 end
adamc@191 2612 | L'.SgiDatatype (x, n, xs, xncs) =>
adamc@156 2613 let
adamc@156 2614 val (cons, x) =
adamc@156 2615 if SS.member (cons, x) then
adamc@156 2616 (cons, "?" ^ x)
adamc@156 2617 else
adamc@156 2618 (SS.add (cons, x), x)
adamc@156 2619
adamc@156 2620 val (xncs, vals) =
adamc@156 2621 ListUtil.foldlMap
adamc@156 2622 (fn ((x, n, t), vals) =>
adamc@156 2623 if SS.member (vals, x) then
adamc@156 2624 (("?" ^ x, n, t), vals)
adamc@156 2625 else
adamc@156 2626 ((x, n, t), SS.add (vals, x)))
adamc@156 2627 vals xncs
adamc@156 2628 in
adamc@191 2629 ((L'.SgiDatatype (x, n, xs, xncs), loc) :: sgis, cons, vals, sgns, strs)
adamc@156 2630 end
adamc@191 2631 | L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs) =>
adamc@156 2632 let
adamc@156 2633 val (cons, x) =
adamc@156 2634 if SS.member (cons, x) then
adamc@156 2635 (cons, "?" ^ x)
adamc@156 2636 else
adamc@156 2637 (SS.add (cons, x), x)
adamc@156 2638 in
adamc@191 2639 ((L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs), loc) :: sgis, cons, vals, sgns, strs)
adamc@156 2640 end
adamc@64 2641 | L'.SgiVal (x, n, c) =>
adamc@64 2642 let
adamc@64 2643 val (vals, x) =
adamc@64 2644 if SS.member (vals, x) then
adamc@64 2645 (vals, "?" ^ x)
adamc@64 2646 else
adamc@64 2647 (SS.add (vals, x), x)
adamc@64 2648 in
adamc@64 2649 ((L'.SgiVal (x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 2650 end
adamc@64 2651 | L'.SgiSgn (x, n, sgn) =>
adamc@64 2652 let
adamc@64 2653 val (sgns, x) =
adamc@64 2654 if SS.member (sgns, x) then
adamc@64 2655 (sgns, "?" ^ x)
adamc@64 2656 else
adamc@64 2657 (SS.add (sgns, x), x)
adamc@64 2658 in
adamc@64 2659 ((L'.SgiSgn (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@64 2660 end
adamc@64 2661
adamc@64 2662 | L'.SgiStr (x, n, sgn) =>
adamc@64 2663 let
adamc@64 2664 val (strs, x) =
adamc@64 2665 if SS.member (strs, x) then
adamc@64 2666 (strs, "?" ^ x)
adamc@64 2667 else
adamc@64 2668 (SS.add (strs, x), x)
adamc@64 2669 in
adamc@64 2670 ((L'.SgiStr (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@88 2671 end
adamc@88 2672 | L'.SgiConstraint _ => ((sgi, loc) :: sgis, cons, vals, sgns, strs))
adamc@64 2673
adamc@63 2674 ([], SS.empty, SS.empty, SS.empty, SS.empty) sgis
adamc@31 2675 in
adamc@83 2676 ((L'.StrConst ds', loc), (L'.SgnConst sgis, loc), gs)
adamc@31 2677 end
adamc@31 2678 | L.StrVar x =>
adamc@31 2679 (case E.lookupStr env x of
adamc@31 2680 NONE =>
adamc@31 2681 (strError env (UnboundStr (loc, x));
adamc@83 2682 (strerror, sgnerror, []))
adamc@83 2683 | SOME (n, sgn) => ((L'.StrVar n, loc), sgn, []))
adamc@34 2684 | L.StrProj (str, x) =>
adamc@34 2685 let
adamc@83 2686 val (str', sgn, gs) = elabStr (env, denv) str
adamc@34 2687 in
adamc@34 2688 case E.projectStr env {str = str', sgn = sgn, field = x} of
adamc@34 2689 NONE => (strError env (UnboundStr (loc, x));
adamc@83 2690 (strerror, sgnerror, []))
adamc@83 2691 | SOME sgn => ((L'.StrProj (str', x), loc), sgn, gs)
adamc@34 2692 end
adamc@41 2693 | L.StrFun (m, dom, ranO, str) =>
adamc@41 2694 let
adamc@83 2695 val (dom', gs1) = elabSgn (env, denv) dom
adamc@41 2696 val (env', n) = E.pushStrNamed env m dom'
adamc@83 2697 val (str', actual, gs2) = elabStr (env', denv) str
adamc@41 2698
adamc@83 2699 val (formal, gs3) =
adamc@41 2700 case ranO of
adamc@83 2701 NONE => (actual, [])
adamc@41 2702 | SOME ran =>
adamc@41 2703 let
adamc@83 2704 val (ran', gs) = elabSgn (env', denv) ran
adamc@41 2705 in
adamc@86 2706 subSgn (env', denv) actual ran';
adamc@83 2707 (ran', gs)
adamc@41 2708 end
adamc@41 2709 in
adamc@41 2710 ((L'.StrFun (m, n, dom', formal, str'), loc),
adamc@83 2711 (L'.SgnFun (m, n, dom', formal), loc),
adamc@83 2712 gs1 @ gs2 @ gs3)
adamc@41 2713 end
adamc@44 2714 | L.StrApp (str1, str2) =>
adamc@44 2715 let
adamc@83 2716 val (str1', sgn1, gs1) = elabStr (env, denv) str1
adamc@83 2717 val (str2', sgn2, gs2) = elabStr (env, denv) str2
adamc@44 2718 in
adamc@44 2719 case #1 (hnormSgn env sgn1) of
adamc@83 2720 L'.SgnError => (strerror, sgnerror, [])
adamc@44 2721 | L'.SgnFun (m, n, dom, ran) =>
adamc@86 2722 (subSgn (env, denv) sgn2 dom;
adamc@44 2723 case #1 (hnormSgn env ran) of
adamc@83 2724 L'.SgnError => (strerror, sgnerror, [])
adamc@44 2725 | L'.SgnConst sgis =>
adamc@44 2726 ((L'.StrApp (str1', str2'), loc),
adamc@83 2727 (L'.SgnConst ((L'.SgiStr (m, n, selfifyAt env {str = str2', sgn = sgn2}), loc) :: sgis), loc),
adamc@83 2728 gs1 @ gs2)
adamc@44 2729 | _ => raise Fail "Unable to hnormSgn in functor application")
adamc@44 2730 | _ => (strError env (NotFunctor sgn1);
adamc@83 2731 (strerror, sgnerror, []))
adamc@44 2732 end
adamc@31 2733
adamc@56 2734 fun elabFile basis env file =
adamc@56 2735 let
adamc@83 2736 val (sgn, gs) = elabSgn (env, D.empty) (L.SgnConst basis, ErrorMsg.dummySpan)
adamc@83 2737 val () = case gs of
adamc@83 2738 [] => ()
adamc@83 2739 | _ => raise Fail "Unresolved disjointness constraints in Basis"
adamc@83 2740
adamc@56 2741 val (env', basis_n) = E.pushStrNamed env "Basis" sgn
adamc@56 2742
adamc@88 2743 val (ds, (env', _)) = dopen (env', D.empty) {str = basis_n, strs = [], sgn = sgn}
adamc@56 2744
adamc@56 2745 fun discoverC r x =
adamc@56 2746 case E.lookupC env' x of
adamc@56 2747 E.NotBound => raise Fail ("Constructor " ^ x ^ " unbound in Basis")
adamc@56 2748 | E.Rel _ => raise Fail ("Constructor " ^ x ^ " bound relatively in Basis")
adamc@56 2749 | E.Named (n, (_, loc)) => r := (L'.CNamed n, loc)
adamc@56 2750
adamc@56 2751 val () = discoverC int "int"
adamc@56 2752 val () = discoverC float "float"
adamc@56 2753 val () = discoverC string "string"
adamc@56 2754
adamc@83 2755 fun elabDecl' (d, (env, gs)) =
adamc@76 2756 let
adamc@76 2757 val () = resetKunif ()
adamc@76 2758 val () = resetCunif ()
adamc@88 2759 val (ds, (env, _, gs)) = elabDecl (d, (env, D.empty, gs))
adamc@76 2760 in
adamc@76 2761 if ErrorMsg.anyErrors () then
adamc@76 2762 ()
adamc@76 2763 else (
adamc@76 2764 if List.exists kunifsInDecl ds then
adamc@91 2765 declError env (KunifsRemain ds)
adamc@76 2766 else
adamc@76 2767 ();
adamc@76 2768
adamc@76 2769 case ListUtil.search cunifsInDecl ds of
adamc@76 2770 NONE => ()
adamc@76 2771 | SOME loc =>
adamc@91 2772 declError env (CunifsRemain ds)
adamc@76 2773 );
adamc@76 2774
adamc@83 2775 (ds, (env, gs))
adamc@76 2776 end
adamc@76 2777
adamc@83 2778 val (file, (_, gs)) = ListUtil.foldlMapConcat elabDecl' (env', []) file
adamc@56 2779 in
adamc@84 2780 if ErrorMsg.anyErrors () then
adamc@84 2781 ()
adamc@84 2782 else
adamc@90 2783 app (fn (loc, env, denv, c1, c2) =>
adamc@84 2784 case D.prove env denv (c1, c2, loc) of
adamc@84 2785 [] => ()
adamc@84 2786 | _ =>
adamc@86 2787 (ErrorMsg.errorAt loc "Couldn't prove field name disjointness";
adamc@84 2788 eprefaces' [("Con 1", p_con env c1),
adamc@90 2789 ("Con 2", p_con env c2),
adamc@90 2790 ("Hnormed 1", p_con env (ElabOps.hnormCon env c1)),
adamc@90 2791 ("Hnormed 2", p_con env (ElabOps.hnormCon env c2))])) gs;
adamc@83 2792
adamc@56 2793 (L'.DFfiStr ("Basis", basis_n, sgn), ErrorMsg.dummySpan) :: ds @ file
adamc@56 2794 end
adamc@2 2795
adamc@2 2796 end