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1 (* Copyright (c) 2008, Adam Chlipala
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2 * All rights reserved.
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3 *
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4 * Redistribution and use in source and binary forms, with or without
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5 * modification, are permitted provided that the following conditions are met:
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6 *
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7 * - Redistributions of source code must retain the above copyright notice,
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8 * this list of conditions and the following disclaimer.
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9 * - Redistributions in binary form must reproduce the above copyright notice,
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10 * this list of conditions and the following disclaimer in the documentation
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11 * and/or other materials provided with the distribution.
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12 * - The names of contributors may not be used to endorse or promote products
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13 * derived from this software without specific prior written permission.
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14 *
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15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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25 * POSSIBILITY OF SUCH DAMAGE.
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26 *)
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27
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28 structure Explify :> EXPLIFY = struct
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29
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30 structure EM = ErrorMsg
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31 structure L = Elab
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32 structure L' = Expl
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33
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34 fun explifyKind (k, loc) =
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35 case k of
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36 L.KType => (L'.KType, loc)
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37 | L.KArrow (k1, k2) => (L'.KArrow (explifyKind k1, explifyKind k2), loc)
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38 | L.KName => (L'.KName, loc)
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39 | L.KRecord k => (L'.KRecord (explifyKind k), loc)
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40
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41 | L.KUnit => (L'.KUnit, loc)
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42
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43 | L.KError => raise Fail ("explifyKind: KError at " ^ EM.spanToString loc)
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44 | L.KUnif (_, _, ref (SOME k)) => explifyKind k
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45 | L.KUnif _ => raise Fail ("explifyKind: KUnif at " ^ EM.spanToString loc)
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46
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47 fun explifyCon (c, loc) =
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48 case c of
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49 L.TFun (t1, t2) => (L'.TFun (explifyCon t1, explifyCon t2), loc)
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50 | L.TCFun (_, x, k, t) => (L'.TCFun (x, explifyKind k, explifyCon t), loc)
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51 | L.TDisjoint (_, _, c) => explifyCon c
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52 | L.TRecord c => (L'.TRecord (explifyCon c), loc)
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53
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54 | L.CRel n => (L'.CRel n, loc)
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55 | L.CNamed n => (L'.CNamed n, loc)
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56 | L.CModProj (m, ms, x) => (L'.CModProj (m, ms, x), loc)
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57
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58 | L.CApp (c1, c2) => (L'.CApp (explifyCon c1, explifyCon c2), loc)
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59 | L.CAbs (x, k, c) => (L'.CAbs (x, explifyKind k, explifyCon c), loc)
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60 | L.CDisjoint (_, _, c) => explifyCon c
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61
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62 | L.CName s => (L'.CName s, loc)
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63
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64 | L.CRecord (k, xcs) => (L'.CRecord (explifyKind k, map (fn (c1, c2) => (explifyCon c1, explifyCon c2)) xcs), loc)
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65 | L.CConcat (c1, c2) => (L'.CConcat (explifyCon c1, explifyCon c2), loc)
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66 | L.CFold (dom, ran) => (L'.CFold (explifyKind dom, explifyKind ran), loc)
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67
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68 | L.CUnit => (L'.CUnit, loc)
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69
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70 | L.CError => raise Fail ("explifyCon: CError at " ^ EM.spanToString loc)
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71 | L.CUnif (_, _, _, ref (SOME c)) => explifyCon c
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72 | L.CUnif _ => raise Fail ("explifyCon: CUnif at " ^ EM.spanToString loc)
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73
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74 fun explifyExp (e, loc) =
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75 case e of
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76 L.EPrim p => (L'.EPrim p, loc)
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77 | L.ERel n => (L'.ERel n, loc)
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78 | L.ENamed n => (L'.ENamed n, loc)
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79 | L.EModProj (m, ms, x) => (L'.EModProj (m, ms, x), loc)
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80 | L.EApp (e1, e2) => (L'.EApp (explifyExp e1, explifyExp e2), loc)
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81 | L.EAbs (x, dom, ran, e1) => (L'.EAbs (x, explifyCon dom, explifyCon ran, explifyExp e1), loc)
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82 | L.ECApp (e1, c) => (L'.ECApp (explifyExp e1, explifyCon c), loc)
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83 | L.ECAbs (_, x, k, e1) => (L'.ECAbs (x, explifyKind k, explifyExp e1), loc)
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84
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85 | L.ERecord xes => (L'.ERecord (map (fn (c, e, t) => (explifyCon c, explifyExp e, explifyCon t)) xes), loc)
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86 | L.EField (e1, c, {field, rest}) => (L'.EField (explifyExp e1, explifyCon c,
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87 {field = explifyCon field, rest = explifyCon rest}), loc)
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88 | L.EFold k => (L'.EFold (explifyKind k), loc)
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89
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90 | L.EError => raise Fail ("explifyExp: EError at " ^ EM.spanToString loc)
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91
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92 fun explifySgi (sgi, loc) =
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93 case sgi of
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94 L.SgiConAbs (x, n, k) => SOME (L'.SgiConAbs (x, n, explifyKind k), loc)
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95 | L.SgiCon (x, n, k, c) => SOME (L'.SgiCon (x, n, explifyKind k, explifyCon c), loc)
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96 | L.SgiVal (x, n, c) => SOME (L'.SgiVal (x, n, explifyCon c), loc)
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97 | L.SgiStr (x, n, sgn) => SOME (L'.SgiStr (x, n, explifySgn sgn), loc)
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98 | L.SgiSgn (x, n, sgn) => SOME (L'.SgiSgn (x, n, explifySgn sgn), loc)
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99 | L.SgiConstraint _ => NONE
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100
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101 and explifySgn (sgn, loc) =
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102 case sgn of
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103 L.SgnConst sgis => (L'.SgnConst (List.mapPartial explifySgi sgis), loc)
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104 | L.SgnVar n => (L'.SgnVar n, loc)
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105 | L.SgnFun (m, n, dom, ran) => (L'.SgnFun (m, n, explifySgn dom, explifySgn ran), loc)
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106 | L.SgnWhere (sgn, x, c) => (L'.SgnWhere (explifySgn sgn, x, explifyCon c), loc)
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107 | L.SgnProj x => (L'.SgnProj x, loc)
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108 | L.SgnError => raise Fail ("explifySgn: SgnError at " ^ EM.spanToString loc)
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109
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110 fun explifyDecl (d, loc : EM.span) =
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111 case d of
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112 L.DCon (x, n, k, c) => SOME (L'.DCon (x, n, explifyKind k, explifyCon c), loc)
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113 | L.DVal (x, n, t, e) => SOME (L'.DVal (x, n, explifyCon t, explifyExp e), loc)
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114 | L.DValRec vis => SOME (L'.DValRec (map (fn (x, n, t, e) => (x, n, explifyCon t, explifyExp e)) vis), loc)
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115
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116 | L.DSgn (x, n, sgn) => SOME (L'.DSgn (x, n, explifySgn sgn), loc)
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117 | L.DStr (x, n, sgn, str) => SOME (L'.DStr (x, n, explifySgn sgn, explifyStr str), loc)
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118 | L.DFfiStr (x, n, sgn) => SOME (L'.DFfiStr (x, n, explifySgn sgn), loc)
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119 | L.DConstraint (c1, c2) => NONE
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120 | L.DExport (en, sgn, str) => SOME (L'.DExport (en, explifySgn sgn, explifyStr str), loc)
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121
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122 and explifyStr (str, loc) =
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123 case str of
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124 L.StrConst ds => (L'.StrConst (List.mapPartial explifyDecl ds), loc)
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125 | L.StrVar n => (L'.StrVar n, loc)
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126 | L.StrProj (str, s) => (L'.StrProj (explifyStr str, s), loc)
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127 | L.StrFun (m, n, dom, ran, str) => (L'.StrFun (m, n, explifySgn dom, explifySgn ran, explifyStr str), loc)
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128 | L.StrApp (str1, str2) => (L'.StrApp (explifyStr str1, explifyStr str2), loc)
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129 | L.StrError => raise Fail ("explifyStr: StrError at " ^ EM.spanToString loc)
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130
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131 val explify = List.mapPartial explifyDecl
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132
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133 end
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