summaryrefslogtreecommitdiff
path: root/src/mono_fooify.sml
blob: 9cb144007cb9a698dd4e7e9f54880169896beaa5 (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
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
structure MonoFooify :> MONO_FOOIFY = struct

open Mono

datatype foo_kind =
         Attr
       | Url

val nextPvar = ref 0
val pvarDefs = ref ([] : (string * int * (string * int * typ option) list) list)

structure Fm = struct

type vr = string * int * typ * exp * string

structure IM = IntBinaryMap

structure M = BinaryMapFn(struct
                          type ord_key = foo_kind
                          fun compare x =
                              case x of
                                  (Attr, Attr) => EQUAL
                                | (Attr, _) => LESS
                                | (_, Attr) => GREATER

                                | (Url, Url) => EQUAL
                          end)

structure TM = BinaryMapFn(struct
                           type ord_key = typ
                           val compare = MonoUtil.Typ.compare
                           end)

type t = {
     count : int,
     map : int IM.map M.map,
     listMap : int TM.map M.map,
     decls : vr list
}

fun empty count = {
    count = count,
    map = M.empty,
    listMap = M.empty,
    decls = []
}

fun chooseNext count =
    let
        val n = !nextPvar
    in
        if count < n then
            (count, count+1)
        else
            (nextPvar := n + 1;
             (n, n+1))
    end

fun enter ({count, map, listMap, ...} : t) = {count = count, map = map, listMap = listMap, decls = []}
fun freshName {count, map, listMap, decls} =
    let
        val (next, count) = chooseNext count
    in
        (next, {count = count , map = map, listMap = listMap, decls = decls})
    end
fun decls ({decls, ...} : t) =
    case decls of
        [] => []
      | _ => [(DValRec decls, ErrorMsg.dummySpan)]

fun lookup (t as {count, map, listMap, decls}) k n thunk =
    let
        val im = Option.getOpt (M.find (map, k), IM.empty)
    in
        case IM.find (im, n) of
            NONE =>
            let
                val n' = count
                val (d, {count, map, listMap, decls}) =
                    thunk count {count = count + 1,
                                 map = M.insert (map, k, IM.insert (im, n, n')),
                                 listMap = listMap,
                                 decls = decls}
            in
                ({count = count,
                  map = map,
                  listMap = listMap,
                  decls = d :: decls}, n')
            end
          | SOME n' => (t, n')
    end

fun lookupList (t as {count, map, listMap, decls}) k tp thunk =
    let
        val tm = Option.getOpt (M.find (listMap, k), TM.empty)
    in
        case TM.find (tm, tp) of
            NONE =>
            let
                val n' = count
                val (d, {count, map, listMap, decls}) =
                    thunk count {count = count + 1,
                                 map = map,
                                 listMap = M.insert (listMap, k, TM.insert (tm, tp, n')),
                                 decls = decls}
            in
                ({count = count,
                  map = map,
                  listMap = listMap,
                  decls = d :: decls}, n')
            end
          | SOME n' => (t, n')
    end

end

fun fk2s fk =
    case fk of
        Attr => "attr"
      | Url => "url"

fun capitalize s =
    if s = "" then
        s
    else
        str (Char.toUpper (String.sub (s, 0))) ^ String.extract (s, 1, NONE)

structure E = ErrorMsg

exception TypeMismatch of Fm.t * E.span
exception CantPass of Fm.t * typ
exception DontKnow of Fm.t * typ

val dummyExp = (EPrim (Prim.Int 0), E.dummySpan)

fun fooifyExpWithExceptions fk lookupENamed lookupDatatype =
    let
        fun fooify fm (e, tAll as (t, loc)) =
            case #1 e of
                EClosure (fnam, [(ERecord [], _)]) =>
                let
                    val (_, s) = lookupENamed fnam
                in
                    ((EPrim (Prim.String (Prim.Normal, Settings.getUrlPrefix () ^ s)), loc), fm)
                end
              | EClosure (fnam, args) =>
                let
                    val (ft, s) = lookupENamed fnam
                    fun attrify (args, ft, e, fm) =
                        case (args, ft) of
                            ([], _) => (e, fm)
                          | (arg :: args, (TFun (t, ft), _)) =>
                            let
                                val (arg', fm) = fooify fm (arg, t)
                            in
                                attrify (args, ft,
                                         (EStrcat (e,
                                                      (EStrcat ((EPrim (Prim.String (Prim.Normal, "/")), loc),
                                                                   arg'), loc)), loc),
                                         fm)
                            end
                          | _ => raise TypeMismatch (fm, loc)
                in
                    attrify (args, ft, (EPrim (Prim.String (Prim.Normal, Settings.getUrlPrefix () ^ s)), loc), fm)
                end
              | _ =>
                case t of
                    TFfi ("Basis", "unit") => ((EPrim (Prim.String (Prim.Normal, "_")), loc), fm)
                  | TFfi (m, x) => (if Settings.mayClientToServer (m, x)
                                    then ((EFfiApp (m, fk2s fk ^ "ify" ^ capitalize x, [(e, tAll)]), loc), fm)
                                    else raise CantPass (fm, tAll))

                  | TRecord [] => ((EPrim (Prim.String (Prim.Normal, "_")), loc), fm)
                  | TRecord ((x, t) :: xts) =>
                    let
                        val (se, fm) = fooify fm ((EField (e, x), loc), t)
                    in
                        foldl (fn ((x, t), (se, fm)) =>
                                  let
                                      val (se', fm) = fooify fm ((EField (e, x), loc), t)
                                  in
                                      ((EStrcat (se,
                                                    (EStrcat ((EPrim (Prim.String (Prim.Normal, "/")), loc),
                                                                 se'), loc)), loc),
                                       fm)
                                  end) (se, fm) xts
                    end

                  | TDatatype (i, ref (dk, _)) =>
                    let
                        fun makeDecl n fm =
                            let
                                val (x, xncs) =
                                    case ListUtil.search (fn (x, i', xncs) =>
                                                             if i' = i then
                                                                 SOME (x, xncs)
                                                             else
                                                                 NONE) (!pvarDefs) of
                                        NONE => lookupDatatype i
                                      | SOME v => v

                                val (branches, fm) =
                                    ListUtil.foldlMap
                                        (fn ((x, n, to), fm) =>
                                            case to of
                                                NONE =>
                                                (((PCon (dk, PConVar n, NONE), loc),
                                                  (EPrim (Prim.String (Prim.Normal, x)), loc)),
                                                 fm)
                                              | SOME t =>
                                                let
                                                    val (arg, fm) = fooify fm ((ERel 0, loc), t)
                                                in
                                                    (((PCon (dk, PConVar n, SOME (PVar ("a", t), loc)), loc),
                                                      (EStrcat ((EPrim (Prim.String (Prim.Normal, x ^ "/")), loc),
                                                                   arg), loc)),
                                                     fm)
                                                end)
                                        fm xncs

                                val dom = tAll
                                val ran = (TFfi ("Basis", "string"), loc)
                            in
                                ((fk2s fk ^ "ify_" ^ x,
                                  n,
                                  (TFun (dom, ran), loc),
                                  (EAbs ("x",
                                            dom,
                                            ran,
                                            (ECase ((ERel 0, loc),
                                                       branches,
                                                       {disc = dom,
                                                        result = ran}), loc)), loc),
                                  ""),
                                 fm)
                            end

                        val (fm, n) = Fm.lookup fm fk i makeDecl
                    in
                        ((EApp ((ENamed n, loc), e), loc), fm)
                    end

                  | TOption t =>
                    let
                        val (body, fm) = fooify fm ((ERel 0, loc), t)
                    in
                        ((ECase (e,
                                    [((PNone t, loc),
                                      (EPrim (Prim.String (Prim.Normal, "None")), loc)),

                                     ((PSome (t, (PVar ("x", t), loc)), loc),
                                      (EStrcat ((EPrim (Prim.String (Prim.Normal, "Some/")), loc),
                                                   body), loc))],
                                    {disc = tAll,
                                     result = (TFfi ("Basis", "string"), loc)}), loc),
                         fm)
                    end

                  | TList t =>
                    let
                        fun makeDecl n fm =
                            let
                                val rt = (TRecord [("1", t), ("2", (TList t, loc))], loc)
                                val (arg, fm) = fooify fm ((ERel 0, loc), rt)

                                val branches = [((PNone rt, loc),
                                                 (EPrim (Prim.String (Prim.Normal, "Nil")), loc)),
                                                ((PSome (rt, (PVar ("a", rt), loc)), loc),
                                                 (EStrcat ((EPrim (Prim.String (Prim.Normal, "Cons/")), loc),
                                                              arg), loc))]

                                val dom = tAll
                                val ran = (TFfi ("Basis", "string"), loc)
                            in
                                ((fk2s fk ^ "ify_list",
                                  n,
                                  (TFun (dom, ran), loc),
                                  (EAbs ("x",
                                            dom,
                                            ran,
                                            (ECase ((ERel 0, loc),
                                                       branches,
                                                       {disc = dom,
                                                        result = ran}), loc)), loc),
                                  ""),
                                 fm)
                            end

                        val (fm, n) = Fm.lookupList fm fk t makeDecl
                    in
                        ((EApp ((ENamed n, loc), e), loc), fm)
                    end

                  | _ => raise DontKnow (fm, tAll)
    in
        fooify
    end

fun fooifyExp fk lookupENamed lookupDatatype fm exp =
    fooifyExpWithExceptions fk lookupENamed lookupDatatype fm exp
    handle TypeMismatch (fm, loc) =>
           (E.errorAt loc "Type mismatch encoding attribute";
            (dummyExp, fm))
         | CantPass (fm, typ as (_, loc)) =>
           (E.errorAt loc "MonoFooify: can't pass type from client to server";
            Print.eprefaces' [("Type", MonoPrint.p_typ MonoEnv.empty typ)];
            (dummyExp, fm))
         | DontKnow (fm, typ as (_, loc)) =>
           (E.errorAt loc "Don't know how to encode attribute/URL type";
            Print.eprefaces' [("Type", MonoPrint.p_typ MonoEnv.empty typ)];
            (dummyExp, fm))

(* Has to be set at the end of [Monoize]. *)
val canonicalFm = ref (Fm.empty 0 : Fm.t)

fun urlify env expTyp =
    let
        val (exp, fm) =
            fooifyExpWithExceptions
                Url
                (fn n =>
                    let
                        val (_, t, _, s) = MonoEnv.lookupENamed env n
                    in
                        (t, s)
                    end)
                (fn n => MonoEnv.lookupDatatype env n)
                (!canonicalFm)
                expTyp
    in
        canonicalFm := fm;
        SOME exp
    end
    handle TypeMismatch _ => NONE
         | CantPass _ => NONE
         | DontKnow _ => NONE

fun getNewFmDecls () =
    let
        val fm = !canonicalFm
    in
        canonicalFm := Fm.enter fm;
        Fm.decls fm
    end

end