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annotate src/mono_env.sml @ 213:0343557355fc

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Explifying type classes
author Adam Chlipala <adamc@hcoop.net>
date Sat, 16 Aug 2008 14:45:23 -0400
parents ab86aa858e6c
children 42dfb0d61cf0
rev   line source
adamc@25 1 (* Copyright (c) 2008, Adam Chlipala
adamc@25 2 * All rights reserved.
adamc@25 3 *
adamc@25 4 * Redistribution and use in source and binary forms, with or without
adamc@25 5 * modification, are permitted provided that the following conditions are met:
adamc@25 6 *
adamc@25 7 * - Redistributions of source code must retain the above copyright notice,
adamc@25 8 * this list of conditions and the following disclaimer.
adamc@25 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@25 10 * this list of conditions and the following disclaimer in the documentation
adamc@25 11 * and/or other materials provided with the distribution.
adamc@25 12 * - The names of contributors may not be used to endorse or promote products
adamc@25 13 * derived from this software without specific prior written permission.
adamc@25 14 *
adamc@25 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@25 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@25 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@25 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@25 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@25 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@25 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@25 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@25 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@25 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@25 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@25 26 *)
adamc@25 27
adamc@25 28 structure MonoEnv :> MONO_ENV = struct
adamc@25 29
adamc@25 30 open Mono
adamc@25 31
adamc@25 32 structure IM = IntBinaryMap
adamc@25 33
adamc@25 34
adamc@25 35 exception UnboundRel of int
adamc@25 36 exception UnboundNamed of int
adamc@25 37
adamc@25 38 type env = {
adamc@168 39 datatypes : (string * (string * int * typ option) list) IM.map,
adamc@178 40 constructors : (string * typ option * int) IM.map,
adamc@25 41
adamc@183 42 relE : (string * typ * exp option) list,
adamc@109 43 namedE : (string * typ * exp option * string) IM.map
adamc@25 44 }
adamc@25 45
adamc@25 46 val empty = {
adamc@168 47 datatypes = IM.empty,
adamc@178 48 constructors = IM.empty,
adamc@25 49
adamc@25 50 relE = [],
adamc@25 51 namedE = IM.empty
adamc@25 52 }
adamc@25 53
adamc@168 54 fun pushDatatype (env : env) x n xncs =
adamc@168 55 {datatypes = IM.insert (#datatypes env, n, (x, xncs)),
adamc@182 56 constructors = foldl (fn ((x, n', to), constructors) =>
adamc@182 57 IM.insert (constructors, n', (x, to, n)))
adamc@178 58 (#constructors env) xncs,
adamc@25 59
adamc@25 60 relE = #relE env,
adamc@25 61 namedE = #namedE env}
adamc@25 62
adamc@168 63 fun lookupDatatype (env : env) n =
adamc@168 64 case IM.find (#datatypes env, n) of
adamc@25 65 NONE => raise UnboundNamed n
adamc@25 66 | SOME x => x
adamc@25 67
adamc@178 68 fun lookupConstructor (env : env) n =
adamc@178 69 case IM.find (#constructors env, n) of
adamc@178 70 NONE => raise UnboundNamed n
adamc@178 71 | SOME x => x
adamc@178 72
adamc@183 73 fun pushERel (env : env) x t eo =
adamc@168 74 {datatypes = #datatypes env,
adamc@178 75 constructors = #constructors env,
adamc@25 76
adamc@183 77 relE = (x, t, eo) :: #relE env,
adamc@25 78 namedE = #namedE env}
adamc@25 79
adamc@25 80 fun lookupERel (env : env) n =
adamc@25 81 (List.nth (#relE env, n))
adamc@25 82 handle Subscript => raise UnboundRel n
adamc@25 83
adamc@109 84 fun pushENamed (env : env) x n t eo s =
adamc@168 85 {datatypes = #datatypes env,
adamc@178 86 constructors = #constructors env,
adamc@25 87
adamc@25 88 relE = #relE env,
adamc@109 89 namedE = IM.insert (#namedE env, n, (x, t, eo, s))}
adamc@25 90
adamc@25 91 fun lookupENamed (env : env) n =
adamc@25 92 case IM.find (#namedE env, n) of
adamc@25 93 NONE => raise UnboundNamed n
adamc@25 94 | SOME x => x
adamc@25 95
adamc@164 96 fun declBinds env (d, loc) =
adamc@25 97 case d of
adamc@164 98 DDatatype (x, n, xncs) =>
adamc@164 99 let
adamc@168 100 val env = pushDatatype env x n xncs
adamc@198 101 val dt = (TDatatype (n, ref (ElabUtil.classifyDatatype xncs, xncs)), loc)
adamc@164 102 in
adamc@188 103 foldl (fn ((x', n', NONE), env) => pushENamed env x' n' dt NONE ""
adamc@188 104 | ((x', n', SOME t), env) => pushENamed env x' n' (TFun (t, dt), loc) NONE "")
adamc@164 105 env xncs
adamc@164 106 end
adamc@164 107 | DVal (x, n, t, e, s) => pushENamed env x n t (SOME e) s
adamc@126 108 | DValRec vis => foldl (fn ((x, n, t, e, s), env) => pushENamed env x n t NONE s) env vis
adamc@109 109 | DExport _ => env
adamc@25 110
adamc@179 111 fun patBinds env (p, loc) =
adamc@179 112 case p of
adamc@179 113 PWild => env
adamc@183 114 | PVar (x, t) => pushERel env x t NONE
adamc@179 115 | PPrim _ => env
adamc@188 116 | PCon (_, _, NONE) => env
adamc@188 117 | PCon (_, _, SOME p) => patBinds env p
adamc@182 118 | PRecord xps => foldl (fn ((_, p, _), env) => patBinds env p) env xps
adamc@179 119
adamc@25 120 end