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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 FlatEnv :> FLAT_ENV = struct
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29
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30 open Flat
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31
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32 structure IM = IntBinaryMap
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33
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34
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35 exception UnboundRel of int
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36 exception UnboundNamed of int
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37 exception UnboundF of int
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38
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39 type env = {
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40 namedT : (string * typ option) IM.map,
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41
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42 relE : (string * typ) list,
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43 namedE : (string * typ) IM.map,
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44
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45 F : (string * typ * typ) IM.map
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46 }
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47
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48 val empty = {
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49 namedT = IM.empty,
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50
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51 relE = [],
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52 namedE = IM.empty,
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53
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54 F = IM.empty
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55 }
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56
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57 fun pushTNamed (env : env) x n co =
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58 {namedT = IM.insert (#namedT env, n, (x, co)),
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59
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60 relE = #relE env,
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61 namedE = #namedE env,
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62
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63 F = #F env}
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64
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65 fun lookupTNamed (env : env) n =
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66 case IM.find (#namedT env, n) of
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67 NONE => raise UnboundNamed n
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68 | SOME x => x
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69
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70 fun pushERel (env : env) x t =
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71 {namedT = #namedT env,
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72
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73 relE = (x, t) :: #relE env,
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74 namedE = #namedE env,
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75
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76 F = #F env}
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77
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78 fun lookupERel (env : env) n =
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79 (List.nth (#relE env, n))
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80 handle Subscript => raise UnboundRel n
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81
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82 fun listERels (env : env) = #relE env
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83
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84 fun pushENamed (env : env) x n t =
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85 {namedT = #namedT env,
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86
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87 relE = #relE env,
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88 namedE = IM.insert (#namedE env, n, (x, t)),
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89
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90 F = #F env}
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91
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92 fun lookupENamed (env : env) n =
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93 case IM.find (#namedE env, n) of
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94 NONE => raise UnboundNamed n
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95 | SOME x => x
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96
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97 fun pushF (env : env) n x dom ran =
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98 {namedT = #namedT env,
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99
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100 relE = #relE env,
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101 namedE = #namedE env,
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102
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103 F = IM.insert (#F env, n, (x, dom, ran))}
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104
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105 fun lookupF (env : env) n =
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106 case IM.find (#F env, n) of
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107 NONE => raise UnboundF n
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108 | SOME x => x
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109
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110 fun declBinds env (d, _) =
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111 case d of
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112 DVal (x, n, t, _) => pushENamed env x n t
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113 | DFun (n, x, dom, ran, _) => pushF env n x dom ran
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114 | DPage _ => env
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115
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116 end
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