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annotate src/mono_env.sml @ 1514:3c0803c1acd7

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Backpedal on tutorial-motivated urweb-mode changes; add Basis.diffInSeconds and Basis.toSeconds
author Adam Chlipala <adam@chlipala.net>
date Fri, 22 Jul 2011 15:39:38 -0400
parents d328983dc5a6
children 6f2ea4ed573a
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@800 73 structure U = MonoUtil
adamc@800 74
adamc@800 75 val liftExpInExp =
adamc@800 76 U.Exp.mapB {typ = fn t => t,
adamc@800 77 exp = fn bound => fn e =>
adamc@800 78 case e of
adamc@800 79 ERel xn =>
adamc@800 80 if xn < bound then
adamc@800 81 e
adamc@800 82 else
adamc@800 83 ERel (xn + 1)
adamc@800 84 | _ => e,
adamc@800 85 bind = fn (bound, U.Exp.RelE _) => bound + 1
adamc@800 86 | (bound, _) => bound}
adamc@800 87
adam@1394 88 val subExpInExp =
adam@1394 89 U.Exp.mapB {typ = fn t => t,
adam@1394 90 exp = fn (xn, rep) => fn e =>
adam@1394 91 case e of
adam@1394 92 ERel xn' =>
adam@1394 93 (case Int.compare (xn', xn) of
adam@1394 94 EQUAL => #1 rep
adam@1394 95 | GREATER=> ERel (xn' - 1)
adam@1394 96 | LESS => e)
adam@1394 97 | _ => e,
adam@1394 98 bind = fn ((xn, rep), U.Exp.RelE _) => (xn+1, liftExpInExp 0 rep)
adam@1394 99 | (ctx, _) => ctx}
adam@1394 100
adamc@183 101 fun pushERel (env : env) x t eo =
adamc@168 102 {datatypes = #datatypes env,
adamc@178 103 constructors = #constructors env,
adamc@800 104 relE = (x, t, eo) :: map (fn (x, t, eo) => (x, t, Option.map (liftExpInExp 0) eo)) (#relE env),
adamc@25 105 namedE = #namedE env}
adamc@25 106
adamc@25 107 fun lookupERel (env : env) n =
adamc@25 108 (List.nth (#relE env, n))
adamc@25 109 handle Subscript => raise UnboundRel n
adamc@25 110
adamc@109 111 fun pushENamed (env : env) x n t eo s =
adamc@168 112 {datatypes = #datatypes env,
adamc@178 113 constructors = #constructors env,
adamc@25 114
adamc@25 115 relE = #relE env,
adamc@109 116 namedE = IM.insert (#namedE env, n, (x, t, eo, s))}
adamc@25 117
adamc@25 118 fun lookupENamed (env : env) n =
adamc@25 119 case IM.find (#namedE env, n) of
adamc@25 120 NONE => raise UnboundNamed n
adamc@25 121 | SOME x => x
adamc@25 122
adamc@164 123 fun declBinds env (d, loc) =
adamc@25 124 case d of
adamc@808 125 DDatatype dts =>
adamc@808 126 foldl (fn ((x, n, xncs), env) =>
adamc@808 127 let
adamc@808 128 val env = pushDatatype env x n xncs
adamc@808 129 val dt = (TDatatype (n, ref (ElabUtil.classifyDatatype xncs, xncs)), loc)
adamc@808 130 in
adamc@808 131 foldl (fn ((x', n', NONE), env) => pushENamed env x' n' dt NONE ""
adamc@808 132 | ((x', n', SOME t), env) => pushENamed env x' n' (TFun (t, dt), loc) NONE "")
adamc@808 133 env xncs
adamc@808 134 end) env dts
adamc@164 135 | DVal (x, n, t, e, s) => pushENamed env x n t (SOME e) s
adamc@126 136 | DValRec vis => foldl (fn ((x, n, t, e, s), env) => pushENamed env x n t NONE s) env vis
adamc@109 137 | DExport _ => env
adamc@273 138 | DTable _ => env
adamc@338 139 | DSequence _ => env
adamc@754 140 | DView _ => env
adamc@271 141 | DDatabase _ => env
adamc@569 142 | DJavaScript _ => env
adamc@725 143 | DCookie _ => env
adamc@718 144 | DStyle _ => env
adamc@1075 145 | DTask _ => env
adamc@1199 146 | DPolicy _ => env
adam@1294 147 | DOnError _ => env
adamc@25 148
adamc@179 149 fun patBinds env (p, loc) =
adamc@179 150 case p of
adamc@179 151 PWild => env
adamc@183 152 | PVar (x, t) => pushERel env x t NONE
adamc@179 153 | PPrim _ => env
adamc@188 154 | PCon (_, _, NONE) => env
adamc@188 155 | PCon (_, _, SOME p) => patBinds env p
adamc@182 156 | PRecord xps => foldl (fn ((_, p, _), env) => patBinds env p) env xps
adamc@288 157 | PNone _ => env
adamc@288 158 | PSome (_, p) => patBinds env p
adamc@179 159
adamc@567 160 fun patBindsN (p, loc) =
adamc@567 161 case p of
adamc@567 162 PWild => 0
adamc@567 163 | PVar _ => 1
adamc@567 164 | PPrim _ => 0
adamc@567 165 | PCon (_, _, NONE) => 0
adamc@567 166 | PCon (_, _, SOME p) => patBindsN p
adamc@567 167 | PRecord xps => foldl (fn ((_, p, _), count) => count + patBindsN p) 0 xps
adamc@567 168 | PNone _ => 0
adamc@567 169 | PSome (_, p) => patBindsN p
adamc@567 170
adamc@25 171 end