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Parametrized datatypes through explify
author Adam Chlipala <adamc@hcoop.net>
date Fri, 08 Aug 2008 10:28:32 -0400
parents 8e9f97508f0d
children 890a61991263
rev   line source
adamc@29 1 (* Copyright (c) 2008, Adam Chlipala
adamc@29 2 * All rights reserved.
adamc@29 3 *
adamc@29 4 * Redistribution and use in source and binary forms, with or without
adamc@29 5 * modification, are permitted provided that the following conditions are met:
adamc@29 6 *
adamc@29 7 * - Redistributions of source code must retain the above copyright notice,
adamc@29 8 * this list of conditions and the following disclaimer.
adamc@29 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@29 10 * this list of conditions and the following disclaimer in the documentation
adamc@29 11 * and/or other materials provided with the distribution.
adamc@29 12 * - The names of contributors may not be used to endorse or promote products
adamc@29 13 * derived from this software without specific prior written permission.
adamc@29 14 *
adamc@29 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@29 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@29 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@29 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@29 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@29 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@29 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@29 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@29 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@29 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@29 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@29 26 *)
adamc@29 27
adamc@29 28 structure CjrEnv :> CJR_ENV = struct
adamc@29 29
adamc@29 30 open Cjr
adamc@29 31
adamc@29 32 structure IM = IntBinaryMap
adamc@29 33
adamc@29 34
adamc@29 35 exception UnboundRel of int
adamc@29 36 exception UnboundNamed of int
adamc@29 37 exception UnboundF of int
adamc@101 38 exception UnboundStruct of int
adamc@29 39
adamc@29 40 type env = {
adamc@166 41 datatypes : (string * (string * int * typ option) list) IM.map,
adamc@181 42 constructors : (string * typ option * int) IM.map,
adamc@29 43
adamc@29 44 numRelE : int,
adamc@29 45 relE : (string * typ) list,
adamc@29 46 namedE : (string * typ) IM.map,
adamc@29 47
adamc@101 48 structs : (string * typ) list IM.map
adamc@29 49 }
adamc@29 50
adamc@29 51 val empty = {
adamc@166 52 datatypes = IM.empty,
adamc@181 53 constructors = IM.empty,
adamc@29 54
adamc@29 55 numRelE = 0,
adamc@29 56 relE = [],
adamc@29 57 namedE = IM.empty,
adamc@29 58
adamc@101 59 structs = IM.empty
adamc@29 60 }
adamc@29 61
adamc@166 62 fun pushDatatype (env : env) x n xncs =
adamc@166 63 {datatypes = IM.insert (#datatypes env, n, (x, xncs)),
adamc@182 64 constructors = foldl (fn ((x, n', to), constructors) =>
adamc@182 65 IM.insert (constructors, n', (x, to, n)))
adamc@181 66 (#constructors env) xncs,
adamc@29 67
adamc@29 68 numRelE = #numRelE env,
adamc@29 69 relE = #relE env,
adamc@29 70 namedE = #namedE env,
adamc@29 71
adamc@101 72 structs = #structs env}
adamc@29 73
adamc@166 74 fun lookupDatatype (env : env) n =
adamc@166 75 case IM.find (#datatypes env, n) of
adamc@29 76 NONE => raise UnboundNamed n
adamc@29 77 | SOME x => x
adamc@29 78
adamc@181 79 fun lookupConstructor (env : env) n =
adamc@181 80 case IM.find (#constructors env, n) of
adamc@181 81 NONE => raise UnboundNamed n
adamc@181 82 | SOME x => x
adamc@181 83
adamc@29 84 fun pushERel (env : env) x t =
adamc@166 85 {datatypes = #datatypes env,
adamc@181 86 constructors = #constructors env,
adamc@29 87
adamc@29 88 numRelE = #numRelE env + 1,
adamc@29 89 relE = (x, t) :: #relE env,
adamc@29 90 namedE = #namedE env,
adamc@29 91
adamc@101 92 structs = #structs env}
adamc@29 93
adamc@29 94 fun lookupERel (env : env) n =
adamc@29 95 (List.nth (#relE env, n))
adamc@29 96 handle Subscript => raise UnboundRel n
adamc@29 97
adamc@29 98 fun countERels (env : env) = #numRelE env
adamc@29 99
adamc@29 100 fun listERels (env : env) = #relE env
adamc@29 101
adamc@29 102 fun pushENamed (env : env) x n t =
adamc@166 103 {datatypes = #datatypes env,
adamc@181 104 constructors = #constructors env,
adamc@29 105
adamc@29 106 numRelE = #numRelE env,
adamc@29 107 relE = #relE env,
adamc@29 108 namedE = IM.insert (#namedE env, n, (x, t)),
adamc@29 109
adamc@101 110 structs = #structs env}
adamc@29 111
adamc@29 112 fun lookupENamed (env : env) n =
adamc@29 113 case IM.find (#namedE env, n) of
adamc@29 114 NONE => raise UnboundNamed n
adamc@29 115 | SOME x => x
adamc@29 116
adamc@101 117 fun pushStruct (env : env) n xts =
adamc@166 118 {datatypes = #datatypes env,
adamc@181 119 constructors = #constructors env,
adamc@101 120
adamc@101 121 numRelE = #numRelE env,
adamc@101 122 relE = #relE env,
adamc@101 123 namedE = #namedE env,
adamc@101 124
adamc@101 125 structs = IM.insert (#structs env, n, xts)}
adamc@101 126
adamc@101 127 fun lookupStruct (env : env) n =
adamc@101 128 case IM.find (#structs env, n) of
adamc@101 129 NONE => raise UnboundStruct n
adamc@101 130 | SOME x => x
adamc@101 131
adamc@188 132 fun classifyDatatype xncs =
adamc@188 133 if List.all (fn (_, _, NONE) => true | _ => false) xncs then
adamc@188 134 Enum
adamc@188 135 else
adamc@188 136 Default
adamc@188 137
adamc@109 138 fun declBinds env (d, loc) =
adamc@29 139 case d of
adamc@188 140 DDatatype (_, x, n, xncs) =>
adamc@165 141 let
adamc@166 142 val env = pushDatatype env x n xncs
adamc@188 143 val dt = (TDatatype (classifyDatatype xncs, n, xncs), loc)
adamc@165 144 in
adamc@188 145 foldl (fn ((x', n', NONE), env) => pushENamed env x' n' dt
adamc@188 146 | ((x', n', SOME t), env) => pushENamed env x' n' (TFun (t, dt), loc))
adamc@165 147 env xncs
adamc@165 148 end
adamc@165 149 | DStruct (n, xts) => pushStruct env n xts
adamc@165 150 | DVal (x, n, t, _) => pushENamed env x n t
adamc@121 151 | DFun (fx, n, args, ran, _) =>
adamc@121 152 let
adamc@121 153 val t = foldl (fn ((_, arg), t) => (TFun (arg, t), loc)) ran args
adamc@121 154 in
adamc@121 155 pushENamed env fx n t
adamc@121 156 end
adamc@129 157 | DFunRec vis =>
adamc@129 158 foldl (fn ((fx, n, args, ran, _), env) =>
adamc@129 159 let
adamc@129 160 val t = foldl (fn ((_, arg), t) => (TFun (arg, t), loc)) ran args
adamc@129 161 in
adamc@129 162 pushENamed env fx n t
adamc@129 163 end) env vis
adamc@165 164
adamc@29 165
adamc@29 166 end