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Explify 'let'
author Adam Chlipala <adamc@hcoop.net>
date Sat, 01 Nov 2008 16:08:39 -0400
parents fdd7a698be01
children 9117a7bf229c
rev   line source
adamc@110 1 (* Copyright (c) 2008, Adam Chlipala
adamc@110 2 * All rights reserved.
adamc@110 3 *
adamc@110 4 * Redistribution and use in source and binary forms, with or without
adamc@110 5 * modification, are permitted provided that the following conditions are met:
adamc@110 6 *
adamc@110 7 * - Redistributions of source code must retain the above copyright notice,
adamc@110 8 * this list of conditions and the following disclaimer.
adamc@110 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@110 10 * this list of conditions and the following disclaimer in the documentation
adamc@110 11 * and/or other materials provided with the distribution.
adamc@110 12 * - The names of contributors may not be used to endorse or promote products
adamc@110 13 * derived from this software without specific prior written permission.
adamc@110 14 *
adamc@110 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@110 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@110 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@110 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@110 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@110 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@110 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@110 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@110 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@110 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@110 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@110 26 *)
adamc@110 27
adamc@110 28 structure Tag :> TAG = struct
adamc@110 29
adamc@110 30 open Core
adamc@110 31
adamc@110 32 structure U = CoreUtil
adamc@110 33 structure E = CoreEnv
adamc@110 34
adamc@110 35 structure IM = IntBinaryMap
adamc@112 36 structure SM = BinaryMapFn(struct
adamc@112 37 type ord_key = string
adamc@112 38 val compare = String.compare
adamc@112 39 end)
adamc@110 40
adamc@110 41 fun kind (k, s) = (k, s)
adamc@110 42 fun con (c, s) = (c, s)
adamc@110 43
adamc@112 44 fun exp env (e, s) =
adamc@110 45 case e of
adamc@110 46 EApp (
adamc@110 47 (EApp (
adamc@110 48 (EApp (
adamc@110 49 (ECApp (
adamc@110 50 (ECApp (
adamc@110 51 (ECApp (
adamc@110 52 (ECApp (
adamc@140 53 (ECApp (
adamc@140 54 (ECApp (
adamc@140 55 (ECApp (
adamc@140 56 (ECApp (
adamc@140 57 (EFfi ("Basis", "tag"),
adamc@140 58 loc), given), _), absent), _), outer), _), inner), _),
adamc@140 59 useOuter), _), useInner), _), bindOuter), _), bindInner), _),
adamc@110 60 attrs), _),
adamc@110 61 tag), _),
adamc@110 62 xml) =>
adamc@110 63 (case attrs of
adamc@110 64 (ERecord xets, _) =>
adamc@110 65 let
adamc@110 66 val (xets, s) =
adamc@112 67 ListUtil.foldlMap (fn ((x, e, t), (count, tags, byTag, newTags)) =>
adamc@143 68 let
adamc@144 69 fun tagIt (ek, newAttr) =
adamc@143 70 let
adamc@143 71 fun unravel (e, _) =
adamc@143 72 case e of
adamc@143 73 ENamed n => (n, [])
adamc@143 74 | EApp (e1, e2) =>
adamc@143 75 let
adamc@143 76 val (n, es) = unravel e1
adamc@143 77 in
adamc@143 78 (n, es @ [e2])
adamc@143 79 end
adamc@143 80 | _ => (ErrorMsg.errorAt loc "Invalid link expression";
adamc@143 81 (0, []))
adamc@110 82
adamc@110 83
adamc@110 84
adamc@143 85 val (f, args) = unravel e
adamc@112 86
adamc@143 87 val (cn, count, tags, newTags) =
adamc@143 88 case IM.find (tags, f) of
adamc@143 89 NONE =>
adamc@143 90 (count, count + 1, IM.insert (tags, f, count),
adamc@144 91 (ek, f, count) :: newTags)
adamc@143 92 | SOME cn => (cn, count, tags, newTags)
adamc@143 93
adamc@143 94 val (_, _, _, s) = E.lookupENamed env f
adamc@112 95
adamc@143 96 val byTag = case SM.find (byTag, s) of
adamc@144 97 NONE => SM.insert (byTag, s, (ek, f))
adamc@144 98 | SOME (ek', f') =>
adamc@143 99 (if f = f' then
adamc@143 100 ()
adamc@143 101 else
adamc@143 102 ErrorMsg.errorAt loc
adamc@143 103 ("Duplicate HTTP tag "
adamc@143 104 ^ s);
adamc@144 105 if ek = ek' then
adamc@144 106 ()
adamc@144 107 else
adamc@144 108 ErrorMsg.errorAt loc
adamc@144 109 "Function needed as both a link and a form ";
adamc@143 110 byTag)
adamc@143 111
adamc@143 112 val e = (EClosure (cn, args), loc)
adamc@143 113 val t = (CFfi ("Basis", "string"), loc)
adamc@143 114 in
adamc@143 115 (((CName newAttr, loc), e, t),
adamc@143 116 (count, tags, byTag, newTags))
adamc@143 117 end
adamc@143 118 in
adamc@143 119 case x of
adamc@144 120 (CName "Link", _) => tagIt (Link, "Href")
adamc@144 121 | (CName "Action", _) => tagIt (Action, "Action")
adamc@143 122 | _ => ((x, e, t), (count, tags, byTag, newTags))
adamc@143 123 end)
adamc@110 124 s xets
adamc@110 125 in
adamc@110 126 (EApp (
adamc@110 127 (EApp (
adamc@110 128 (EApp (
adamc@110 129 (ECApp (
adamc@110 130 (ECApp (
adamc@110 131 (ECApp (
adamc@110 132 (ECApp (
adamc@140 133 (ECApp (
adamc@140 134 (ECApp (
adamc@140 135 (ECApp (
adamc@140 136 (ECApp (
adamc@140 137 (EFfi ("Basis", "tag"),
adamc@140 138 loc), given), loc), absent), loc), outer), loc), inner), loc),
adamc@140 139 useOuter), loc), useInner), loc), bindOuter), loc), bindInner), loc),
adamc@110 140 (ERecord xets, loc)), loc),
adamc@110 141 tag), loc),
adamc@110 142 xml), s)
adamc@110 143 end
adamc@110 144 | _ => (ErrorMsg.errorAt loc "Attribute record is too complex";
adamc@110 145 (e, s)))
adamc@110 146
adamc@110 147 | _ => (e, s)
adamc@110 148
adamc@110 149 fun decl (d, s) = (d, s)
adamc@110 150
adamc@110 151 fun tag file =
adamc@110 152 let
adamc@179 153 val count = U.File.maxName file
adamc@110 154
adamc@112 155 fun doDecl (d as (d', loc), (env, count, tags, byTag)) =
adamc@112 156 case d' of
adamc@144 157 DExport (ek, n) =>
adamc@112 158 let
adamc@112 159 val (_, _, _, s) = E.lookupENamed env n
adamc@112 160 in
adamc@112 161 case SM.find (byTag, s) of
adamc@112 162 NONE => ([d], (env, count, tags, byTag))
adamc@144 163 | SOME (ek', n') =>
adamc@144 164 (if ek = ek' then
adamc@144 165 ()
adamc@144 166 else
adamc@144 167 ErrorMsg.errorAt loc "Function needed for both a link and a form";
adamc@144 168 ([], (env, count, tags, byTag)))
adamc@112 169 end
adamc@112 170 | _ =>
adamc@112 171 let
adamc@126 172 val env' = E.declBinds env d
adamc@126 173 val env'' = case d' of
adamc@126 174 DValRec _ => env'
adamc@126 175 | _ => env
adamc@126 176
adamc@112 177 val (d, (count, tags, byTag, newTags)) =
adamc@112 178 U.Decl.foldMap {kind = kind,
adamc@112 179 con = con,
adamc@126 180 exp = exp env'',
adamc@112 181 decl = decl}
adamc@112 182 (count, tags, byTag, []) d
adamc@110 183
adamc@126 184 val env = env'
adamc@110 185
adamc@126 186 val newDs = map
adamc@144 187 (fn (ek, f, cn) =>
adamc@112 188 let
adamc@112 189 fun unravel (all as (t, _)) =
adamc@112 190 case t of
adamc@112 191 TFun (dom, ran) =>
adamc@112 192 let
adamc@112 193 val (args, result) = unravel ran
adamc@112 194 in
adamc@112 195 (dom :: args, result)
adamc@112 196 end
adamc@112 197 | _ => ([], all)
adamc@110 198
adamc@112 199 val (fnam, t, _, tag) = E.lookupENamed env f
adamc@112 200 val (args, result) = unravel t
adamc@110 201
adamc@112 202 val unit = (TRecord (CRecord ((KType, loc), []), loc), loc)
adamc@119 203
adamc@119 204 val (abs, t) =
adamc@119 205 case args of
adamc@119 206 [] =>
adamc@119 207 let
adamc@119 208 val body = (EWrite (ENamed f, loc), loc)
adamc@119 209 in
adamc@119 210 ((EAbs ("x", unit, unit, body), loc),
adamc@119 211 (TFun (unit, unit), loc))
adamc@119 212 end
adamc@119 213 | _ =>
adamc@119 214 let
adamc@119 215 val (app, _) = foldl (fn (t, (app, n)) =>
adamc@119 216 ((EApp (app, (ERel n, loc)), loc),
adamc@119 217 n - 1))
adamc@119 218 ((ENamed f, loc), length args - 1) args
adamc@280 219 val app = (EApp (app, (ERecord [], loc)), loc)
adamc@119 220 val body = (EWrite app, loc)
adamc@280 221 val t = (TFun (unit, unit), loc)
adamc@119 222 val (abs, _, t) = foldr (fn (t, (abs, n, rest)) =>
adamc@119 223 ((EAbs ("x" ^ Int.toString n,
adamc@119 224 t,
adamc@119 225 rest,
adamc@119 226 abs), loc),
adamc@119 227 n + 1,
adamc@119 228 (TFun (t, rest), loc)))
adamc@280 229 (body, 0, t) args
adamc@119 230 in
adamc@119 231 (abs, t)
adamc@119 232 end
adamc@112 233 in
adamc@126 234 (("wrap_" ^ fnam, cn, t, abs, tag),
adamc@144 235 (DExport (ek, cn), loc))
adamc@112 236 end) newTags
adamc@126 237
adamc@126 238 val (newVals, newExports) = ListPair.unzip newDs
adamc@126 239
adamc@126 240 val ds = case d of
adamc@126 241 (DValRec vis, _) => [(DValRec (vis @ newVals), loc)]
adamc@126 242 | _ => map (fn vi => (DVal vi, loc)) newVals @ [d]
adamc@112 243 in
adamc@126 244 (ds @ newExports, (env, count, tags, byTag))
adamc@112 245 end
adamc@110 246
adamc@112 247 val (file, _) = ListUtil.foldlMapConcat doDecl (CoreEnv.empty, count+1, IM.empty, SM.empty) file
adamc@110 248 in
adamc@110 249 file
adamc@110 250 end
adamc@110 251
adamc@110 252 end