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Fixed a mind-numbing De Bruijn bug
author Adam Chlipala <adamc@hcoop.net>
date Thu, 11 Sep 2008 19:59:31 -0400
parents 950320f33232
children eec65c11d3e2
rev   line source
adamc@81 1 (* Copyright (c) 2008, Adam Chlipala
adamc@81 2 * All rights reserved.
adamc@81 3 *
adamc@81 4 * Redistribution and use in source and binary forms, with or without
adamc@81 5 * modification, are permitted provided that the following conditions are met:
adamc@81 6 *
adamc@81 7 * - Redistributions of source code must retain the above copyright notice,
adamc@81 8 * this list of conditions and the following disclaimer.
adamc@81 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@81 10 * this list of conditions and the following disclaimer in the documentation
adamc@81 11 * and/or other materials provided with the distribution.
adamc@81 12 * - The names of contributors may not be used to endorse or promote products
adamc@81 13 * derived from this software without specific prior written permission.
adamc@81 14 *
adamc@81 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@81 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@81 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@81 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@81 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@81 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@81 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@81 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@81 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@81 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@81 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@81 26 *)
adamc@81 27
adamc@81 28 structure ElabOps :> ELAB_OPS = struct
adamc@81 29
adamc@81 30 open Elab
adamc@81 31
adamc@81 32 structure E = ElabEnv
adamc@81 33 structure U = ElabUtil
adamc@81 34
adamc@81 35 val liftConInCon = E.liftConInCon
adamc@81 36
adamc@81 37 val subConInCon =
adamc@81 38 U.Con.mapB {kind = fn k => k,
adamc@81 39 con = fn (xn, rep) => fn c =>
adamc@81 40 case c of
adamc@81 41 CRel xn' =>
adamc@81 42 (case Int.compare (xn', xn) of
adamc@81 43 EQUAL => #1 rep
adamc@81 44 | GREATER => CRel (xn' - 1)
adamc@81 45 | LESS => c)
adamc@81 46 (*| CUnif _ => raise SynUnif*)
adamc@81 47 | _ => c,
adamc@81 48 bind = fn ((xn, rep), U.Con.Rel _) => (xn+1, liftConInCon 0 rep)
adamc@81 49 | (ctx, _) => ctx}
adamc@81 50
adamc@81 51 fun subStrInSgn (m1, m2) =
adamc@81 52 U.Sgn.map {kind = fn k => k,
adamc@81 53 con = fn c as CModProj (m1', ms, x) =>
adamc@81 54 if m1 = m1' then
adamc@81 55 CModProj (m2, ms, x)
adamc@81 56 else
adamc@81 57 c
adamc@81 58 | c => c,
adamc@81 59 sgn_item = fn sgi => sgi,
adamc@81 60 sgn = fn sgn => sgn}
adamc@81 61
adamc@81 62
adamc@81 63 fun hnormCon env (cAll as (c, loc)) =
adamc@81 64 case c of
adamc@81 65 CUnif (_, _, _, ref (SOME c)) => hnormCon env c
adamc@81 66
adamc@81 67 | CNamed xn =>
adamc@81 68 (case E.lookupCNamed env xn of
adamc@81 69 (_, _, SOME c') => hnormCon env c'
adamc@81 70 | _ => cAll)
adamc@81 71
adamc@81 72 | CModProj (n, ms, x) =>
adamc@81 73 let
adamc@81 74 val (_, sgn) = E.lookupStrNamed env n
adamc@81 75 val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@81 76 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@81 77 NONE => raise Fail "hnormCon: Unknown substructure"
adamc@81 78 | SOME sgn => ((StrProj (str, m), loc), sgn))
adamc@81 79 ((StrVar n, loc), sgn) ms
adamc@81 80 in
adamc@81 81 case E.projectCon env {sgn = sgn, str = str, field = x} of
adamc@81 82 NONE => raise Fail "kindof: Unknown con in structure"
adamc@81 83 | SOME (_, NONE) => cAll
adamc@81 84 | SOME (_, SOME c) => hnormCon env c
adamc@81 85 end
adamc@81 86
adamc@81 87 | CApp (c1, c2) =>
adamc@81 88 (case #1 (hnormCon env c1) of
adamc@81 89 CAbs (x, k, cb) =>
adamc@81 90 let
adamc@81 91 val sc = (hnormCon env (subConInCon (0, c2) cb))
adamc@81 92 handle SynUnif => cAll
adamc@81 93 (*val env' = E.pushCRel env x k*)
adamc@81 94 in
adamc@328 95 (*Print.eprefaces "Subst" [("x", Print.PD.string x),
adamc@328 96 ("cb", ElabPrint.p_con env' cb),
adamc@328 97 ("c2", ElabPrint.p_con env c2),
adamc@328 98 ("sc", ElabPrint.p_con env sc)];*)
adamc@81 99 sc
adamc@81 100 end
adamc@326 101 | c1' as CApp (c', i) =>
adamc@326 102 let
adamc@326 103 fun default () = (CApp ((c1', loc), hnormCon env c2), loc)
adamc@326 104 in
adamc@326 105 case #1 (hnormCon env c') of
adamc@326 106 CApp (c', f) =>
adamc@326 107 (case #1 (hnormCon env c') of
adamc@326 108 CFold ks =>
adamc@326 109 (case #1 (hnormCon env c2) of
adamc@326 110 CRecord (_, []) => hnormCon env i
adamc@326 111 | CRecord (k, (x, c) :: rest) =>
adamc@326 112 hnormCon env
adamc@326 113 (CApp ((CApp ((CApp (f, x), loc), c), loc),
adamc@81 114 (CApp ((CApp ((CApp ((CFold ks, loc), f), loc), i), loc),
adamc@326 115 (CRecord (k, rest), loc)), loc)), loc)
adamc@326 116 | CConcat ((CRecord (k, (x, c) :: rest), _), rest') =>
adamc@326 117 let
adamc@326 118 val rest'' = (CConcat ((CRecord (k, rest), loc), rest'), loc)
adamc@81 119
adamc@326 120 (*val ccc = (CApp ((CApp ((CApp (f, x), loc), c), loc),
adamc@326 121 (CApp ((CApp ((CApp ((CFold ks, loc), f), loc), i), loc),
adamc@326 122 rest''), loc)), loc)*)
adamc@326 123 in
adamc@326 124 (*eprefaces "Red to" [("ccc", p_con env ccc), ("ccc'", p_con env (hnormCon env ccc))];*)
adamc@326 125 hnormCon env
adamc@326 126 (CApp ((CApp ((CApp (f, x), loc), c), loc),
adamc@81 127 (CApp ((CApp ((CApp ((CFold ks, loc), f), loc), i), loc),
adamc@326 128 rest''), loc)), loc)
adamc@326 129 end
adamc@326 130 | _ => default ())
adamc@326 131 | _ => default ())
adamc@326 132 | _ => default ()
adamc@326 133 end
adamc@326 134 | c1' => (CApp ((c1', loc), hnormCon env c2), loc))
adamc@81 135
adamc@81 136 | CConcat (c1, c2) =>
adamc@81 137 (case (hnormCon env c1, hnormCon env c2) of
adamc@81 138 ((CRecord (k, xcs1), loc), (CRecord (_, xcs2), _)) =>
adamc@81 139 (CRecord (k, xcs1 @ xcs2), loc)
adamc@81 140 | ((CRecord (_, []), _), c2') => c2'
adamc@81 141 | ((CConcat (c11, c12), loc), c2') =>
adamc@81 142 hnormCon env (CConcat (c11, (CConcat (c12, c2'), loc)), loc)
adamc@209 143 | (c1', (CRecord (_, []), _)) => c1'
adamc@81 144 | _ => cAll)
adamc@81 145
adamc@207 146 | CProj (c, n) =>
adamc@207 147 (case hnormCon env c of
adamc@207 148 (CTuple cs, _) => hnormCon env (List.nth (cs, n - 1))
adamc@207 149 | _ => cAll)
adamc@207 150
adamc@81 151 | _ => cAll
adamc@81 152
adamc@81 153 end