summaryrefslogtreecommitdiff
path: root/src/tag.sml
blob: 715da9ed84942d8d6bca42b8d3ecd3b242c3d201 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
(* Copyright (c) 2008, Adam Chlipala
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - The names of contributors may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *)

structure Tag :> TAG = struct

open Core

structure U = CoreUtil
structure E = CoreEnv

structure IM = IntBinaryMap
structure SM = BinaryMapFn(struct
                           type ord_key = string
                           val compare = String.compare
                           end)

fun kind (k, s) = (k, s)
fun con (c, s) = (c, s)

fun exp env (e, s) =
    case e of
        EApp (
        (EApp (
         (EApp (
          (ECApp (
           (ECApp (
            (ECApp (
             (ECApp (
              (ECApp (
               (ECApp (
                (ECApp (
                 (ECApp (
                  (EFfi ("Basis", "tag"),
                   loc), given), _), absent), _), outer), _), inner), _),
              useOuter), _), useInner), _), bindOuter), _), bindInner), _),
          attrs), _),
         tag), _),
        xml) =>
        (case attrs of
             (ERecord xets, _) =>
             let
                 val (xets, s) =
                     ListUtil.foldlMap (fn ((x, e, t), (count, tags, byTag, newTags)) =>
                                           let
                                               fun tagIt (ek, newAttr) =
                                                   let
                                                       fun unravel (e, _) =
                                                           case e of
                                                               ENamed n => (n, [])
                                                             | EApp (e1, e2) =>
                                                               let
                                                                   val (n, es) = unravel e1
                                                               in
                                                                   (n, es @ [e2])
                                                               end
                                                             | _ => (ErrorMsg.errorAt loc "Invalid link expression";
                                                                     (0, []))

                                                       val (f, args) = unravel e

                                                       val (cn, count, tags, newTags) =
                                                           case IM.find (tags, f) of
                                                               NONE =>
                                                               (count, count + 1, IM.insert (tags, f, count),
                                                                (ek, f, count) :: newTags)
                                                             | SOME cn => (cn, count, tags, newTags)
                                                                          
                                                       val (_, _, _, s) = E.lookupENamed env f

                                                       val byTag = case SM.find (byTag, s) of
                                                                       NONE => SM.insert (byTag, s, (ek, f))
                                                                     | SOME (ek', f') =>
                                                                       (if f = f' then
                                                                            ()
                                                                        else
                                                                            ErrorMsg.errorAt loc 
                                                                                             ("Duplicate HTTP tag "
                                                                                              ^ s);
                                                                        if ek = ek' then
                                                                            ()
                                                                        else
                                                                            ErrorMsg.errorAt loc 
                                                                                             "Function needed as both a link and a form ";
                                                                        byTag)

                                                       val e = (EClosure (cn, args), loc)
                                                       val t = (CFfi ("Basis", "string"), loc)
                                                   in
                                                       (((CName newAttr, loc), e, t),
                                                        (count, tags, byTag, newTags))
                                                   end
                                           in
                                               case x of
                                                   (CName "Link", _) => tagIt (Link, "Href")
                                                 | (CName "Action", _) => tagIt (Action, "Action")
                                                 | _ => ((x, e, t), (count, tags, byTag, newTags))
                                           end)
                     s xets
             in
                 (EApp (
                  (EApp (
                   (EApp (
                    (ECApp (
                     (ECApp (
                      (ECApp (
                       (ECApp (
                        (ECApp (
                         (ECApp (
                          (ECApp (
                           (ECApp (
                            (EFfi ("Basis", "tag"),
                             loc), given), loc), absent), loc), outer), loc), inner), loc),
                        useOuter), loc), useInner), loc), bindOuter), loc), bindInner), loc),
                    (ERecord xets, loc)), loc),
                   tag), loc),
                  xml), s)
             end
           | _ => (ErrorMsg.errorAt loc "Attribute record is too complex";
                   (e, s)))

      | _ => (e, s)

fun decl (d, s) = (d, s)

fun tag file =
    let
        val count = U.File.maxName file

        fun doDecl (d as (d', loc), (env, count, tags, byTag)) =
            case d' of
                DExport (ek, n) =>
                let
                    val (_, _, _, s) = E.lookupENamed env n
                in
                    case SM.find (byTag, s) of
                        NONE => ([d], (env, count, tags, byTag))
                      | SOME (ek', n') =>
                        (if ek = ek' then
                             ()
                         else
                             ErrorMsg.errorAt loc "Function needed for both a link and a form";
                         ([], (env, count, tags, byTag)))
                end
              | _ =>
                let
                    val env' = E.declBinds env d
                    val env'' = case d' of
                                    DValRec _ => env'
                                  | _ => env

                    val (d, (count, tags, byTag, newTags)) =
                        U.Decl.foldMap {kind = kind,
                                        con = con,
                                        exp = exp env'',
                                        decl = decl}
                                       (count, tags, byTag, []) d

                    val env = env'

                    val newDs = map
                                    (fn (ek, f, cn) =>
                                        let
                                            val unit = (TRecord (CRecord ((KType, loc), []), loc), loc)

                                            fun unravel (all as (t, _)) =
                                                case t of
                                                    TFun (dom, ran) =>
                                                    let
                                                        val (args, result) = unravel ran
                                                    in
                                                        (dom :: args, result)
                                                    end
                                                  | _ => ([], all)

                                            val (fnam, t, _, tag) = E.lookupENamed env f
                                            val (args, result) = unravel t

                                            val (abs, t) =
                                                case args of
                                                    [] =>
                                                    let
                                                        val app = (EApp ((ENamed f, loc), (ERecord [], loc)), loc)
                                                        val body = (EWrite app, loc)
                                                    in
                                                        (body,
                                                         (TFun (unit, unit), loc))
                                                    end
                                                  | _ =>
                                                    let
                                                        val (app, _) = foldl (fn (t, (app, n)) =>
                                                                                 ((EApp (app, (ERel n, loc)), loc),
                                                                                  n - 1))
                                                                             ((ENamed f, loc), length args - 1) args
                                                        val app = (EApp (app, (ERecord [], loc)), loc)
                                                        val body = (EWrite app, loc)
                                                        val t = (TFun (unit, unit), loc)
                                                        val (abs, _, t) = foldr (fn (t, (abs, n, rest)) =>
                                                                                    ((EAbs ("x" ^ Int.toString n,
                                                                                            t,
                                                                                            rest,
                                                                                            abs), loc),
                                                                                     n + 1,
                                                                                     (TFun (t, rest), loc)))
                                                                                (body, 0, t) args
                                                    in
                                                        (abs, t)
                                                    end
                                        in
                                            (("wrap_" ^ fnam, cn, t, abs, tag),
                                             (DExport (ek, cn), loc))
                                        end) newTags

                    val (newVals, newExports) = ListPair.unzip newDs

                    val ds = case d of
                                 (DValRec vis, _) => [(DValRec (vis @ newVals), loc)]
                               | _ => map (fn vi => (DVal vi, loc)) newVals @ [d]
                in
                    (ds @ newExports, (env, count, tags, byTag))
                end

        val (file, _) = ListUtil.foldlMapConcat doDecl (CoreEnv.empty, count+1, IM.empty, SM.empty) file
    in
        file
    end

end