summaryrefslogtreecommitdiff
path: root/src/jscomp.sml
blob: a4e3dd35d5efd646132c0957d4da89e604ff509d (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
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
(* 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 JsComp :> JSCOMP = struct

open Mono

structure EM = ErrorMsg
structure E = MonoEnv
structure U = MonoUtil

val funcs = [(("Basis", "alert"), "alert"),
             (("Basis", "htmlifyString"), "escape"),
             (("Basis", "new_client_source"), "sc")]

structure FM = BinaryMapFn(struct
                           type ord_key = string * string
                           fun compare ((m1, x1), (m2, x2)) =
                               Order.join (String.compare (m1, m2),
                                           fn () => String.compare (x1, x2))
                           end)

val funcs = foldl (fn ((k, v), m) => FM.insert (m, k, v)) FM.empty funcs

fun ffi k = FM.find (funcs, k)

type state = {
     decls : decl list,
     script : string
}

fun varDepth (e, _) =
    case e of
        EPrim _ => 0
      | ERel _ => 0
      | ENamed _ => 0
      | ECon (_, _, NONE) => 0
      | ECon (_, _, SOME e) => varDepth e
      | ENone _ => 0
      | ESome (_, e) => varDepth e
      | EFfi _ => 0
      | EFfiApp (_, _, es) => foldl Int.max 0 (map varDepth es)
      | EApp (e1, e2) => Int.max (varDepth e1, varDepth e2)
      | EAbs _ => 0
      | EUnop (_, e) => varDepth e
      | EBinop (_, e1, e2) => Int.max (varDepth e1, varDepth e2)
      | ERecord xes => foldl Int.max 0 (map (fn (_, e, _) => varDepth e) xes)
      | EField (e, _) => varDepth e
      | ECase (e, pes, _) =>
        foldl Int.max (varDepth e)
        (map (fn (p, e) => E.patBindsN p + varDepth e) pes)
      | EStrcat (e1, e2) => Int.max (varDepth e1, varDepth e2)
      | EError (e, _) => varDepth e
      | EWrite e => varDepth e
      | ESeq (e1, e2) => Int.max (varDepth e1, varDepth e2)
      | ELet (_, _, e1, e2) => Int.max (varDepth e1, 1 + varDepth e2)
      | EClosure _ => 0
      | EQuery _ => 0
      | EDml _ => 0
      | ENextval _ => 0
      | EUnurlify _ => 0
      | EJavaScript _ => 0
      | ESignalReturn e => varDepth e
      | ESignalBind (e1, e2) => Int.max (varDepth e1, varDepth e2)
      | ESignalSource e => varDepth e

fun strcat loc es =
    case es of
        [] => (EPrim (Prim.String ""), loc)
      | [x] => x
      | x :: es' => (EStrcat (x, strcat loc es'), loc)

fun jsExp mode outer =
    let
        val len = length outer

        fun jsE inner (e as (_, loc), st) =
            let
                fun str s = (EPrim (Prim.String s), loc)

                fun var n = Int.toString (len + inner - n - 1)

                fun patCon pc =
                    case pc of
                        PConVar n => str (Int.toString n)
                      | PConFfi {con, ...} => str ("\"_" ^ con ^ "\"")



                fun isNullable (t, _) =
                    case t of
                        TOption _ => true
                      | _ => false

                fun unsupported s =
                  (EM.errorAt loc (s ^ " in code to be compiled to JavaScript");
                   (str "ERROR", st))

                val strcat = strcat loc

                fun quoteExp (t : typ) e =
                    case #1 t of
                        TSource => strcat [str "s",
                                           (EFfiApp ("Basis", "htmlifyInt", [e]), loc)]
                      | _ => (EM.errorAt loc "Don't know how to embed type in JavaScript";
                              str "ERROR")
            in
                case #1 e of
                    EPrim (Prim.String s) =>
                    (str ("\""
                          ^ String.translate (fn #"'" =>
                                                 if mode = Attribute then
                                                     "\\047"
                                                 else
                                                     "'"
                                               | #"\"" => "\\\""
                                               | #"<" =>
                                                 if mode = Script then
                                                     "<"
                                                 else
                                                     "\\074"
                                               | #"\\" => "\\\\"
                                               | ch => String.str ch) s
                          ^ "\""), st)
                  | EPrim p => (str (Prim.toString p), st)
                  | ERel n =>
                    if n < inner then
                        (str ("uwr" ^ var n), st)
                    else
                        let
                            val n = n - inner
                        in
                            (quoteExp (List.nth (outer, n)) (ERel n, loc), st)
                        end
                  | ENamed _ => raise Fail "Named"
                  | ECon (_, pc, NONE) => (patCon pc, st)
                  | ECon (_, pc, SOME e) =>
                    let
                        val (s, st) = jsE inner (e, st)
                    in
                        (strcat [str "{n:",
                                 patCon pc,
                                 str ",v:",
                                 s,
                                 str "}"], st)
                    end
                  | ENone _ => (str "null", st)
                  | ESome (t, e) =>
                    let
                        val (e, st) = jsE inner (e, st)
                    in
                        (if isNullable t then
                             strcat [str "{v:", e, str "}"]
                         else
                             e, st)
                    end

                  | EFfi k =>
                    let
                        val name = case ffi k of
                                       NONE => (EM.errorAt loc ("Unsupported FFI identifier " ^ #2 k ^ " in JavaScript");
                                                "ERROR")
                                     | SOME s => s
                    in
                        (str name, st)
                    end
                  | EFfiApp (m, x, args) =>
                    let
                        val args =
                            case (m, x, args) of
                                ("Basis", "new_client_source", [(EJavaScript (_, e, _), _)]) => [e]
                              | ("Basis", "set_client_source", [e1, (EJavaScript (_, e2, _), _)]) => [e1, e2]
                              | _ => args

                        val name = case ffi (m, x) of
                                       NONE => (EM.errorAt loc ("Unsupported FFI function " ^ x ^ " in JavaScript");
                                                "ERROR")
                                     | SOME s => s
                    in
                        case args of
                            [] => (str (name ^ "()"), st)
                          | [e] =>
                            let
                                val (e, st) = jsE inner (e, st)
                            in
                                (strcat [str (name ^ "("),
                                         e,
                                         str ")"], st)
                            end
                          | e :: es =>
                            let
                                val (e, st) = jsE inner (e, st)
                                val (es, st) = ListUtil.foldlMapConcat
                                                   (fn (e, st) =>
                                                       let
                                                           val (e, st) = jsE inner (e, st)
                                                       in
                                                           ([str ",", e], st)
                                                       end)
                                                   st es
                            in
                                (strcat (str (name ^ "(")
                                         :: e
                                         :: es
                                         @ [str ")"]), st)
                            end
                    end

                  | EApp (e1, e2) =>
                    let
                        val (e1, st) = jsE inner (e1, st)
                        val (e2, st) = jsE inner (e2, st)
                    in
                        (strcat [e1, str "(", e2, str ")"], st)
                    end
                  | EAbs (_, _, _, e) =>
                    let
                        val locals = List.tabulate
                                     (varDepth e,
                                   fn i => str ("var uwr" ^ Int.toString (len + inner + i) ^ ";"))
                        val (e, st) = jsE (inner + 1) (e, st)
                    in
                        (strcat (str ("function(uwr"
                                      ^ Int.toString (len + inner)
                                      ^ "){")
                                 :: locals
                                 @ [str "return ",
                                    e,
                                    str "}"]),
                         st)
                    end

                  | EUnop (s, e) =>
                    let
                        val (e, st) = jsE inner (e, st)
                    in
                        (strcat [str ("(" ^ s),
                                 e,
                                 str ")"],
                         st)
                    end
                  | EBinop (s, e1, e2) =>
                    let
                        val (e1, st) = jsE inner (e1, st)
                        val (e2, st) = jsE inner (e2, st)
                    in
                        (strcat [str "(",
                                 e1,
                                 str s,
                                 e2,
                                 str ")"],
                         st)
                    end

                  | ERecord [] => (str "null", st)
                  | ERecord [(x, e, _)] =>
                    let
                        val (e, st) = jsE inner (e, st)
                    in
                        (strcat [str "{uw_x:", e, str "}"], st)
                    end
                  | ERecord ((x, e, _) :: xes) =>
                    let
                        val (e, st) = jsE inner (e, st)

                        val (es, st) =
                            foldr (fn ((x, e, _), (es, st)) =>
                                      let
                                          val (e, st) = jsE inner (e, st)
                                      in
                                          (str (",uw_" ^ x ^ ":")
                                           :: e
                                           :: es,
                                           st)
                                      end)
                                  ([str "}"], st) xes
                    in
                        (strcat (str ("{uw_" ^ x ^ ":")
                                 :: e
                                 :: es),
                         st)
                    end
                  | EField (e, x) =>
                    let
                        val (e, st) = jsE inner (e, st)
                    in
                        (strcat [e,
                                 str ("." ^ x)], st)
                    end

                  | ECase _ => raise Fail "Jscomp: ECase"

                  | EStrcat (e1, e2) =>
                    let
                        val (e1, st) = jsE inner (e1, st)
                        val (e2, st) = jsE inner (e2, st)
                    in
                        (strcat [str "(", e1, str "+", e2, str ")"], st)
                    end

                  | EError (e, _) =>
                    let
                        val (e, st) = jsE inner (e, st)
                    in
                        (strcat [str "alert(\"ERROR: \"+", e, str ")"],
                         st)
                    end

                  | EWrite e =>
                    let
                        val (e, st) = jsE inner (e, st)
                    in
                        (strcat [str "document.write(",
                                 e,
                                 str ".v)"], st)
                    end

                  | ESeq (e1, e2) =>
                    let
                        val (e1, st) = jsE inner (e1, st)
                        val (e2, st) = jsE inner (e2, st)
                    in
                        (strcat [str "(", e1, str ",", e2, str ")"], st)
                    end
                  | ELet (_, _, e1, e2) =>
                    let
                        val (e1, st) = jsE inner (e1, st)
                        val (e2, st) = jsE (inner + 1) (e2, st)
                    in
                        (strcat [str ("(uwr" ^ Int.toString (len + inner) ^ "="),
                                 e1,
                                 str ",",
                                 e2,
                                 str ")"], st)
                    end

                  | EClosure _ => unsupported "EClosure"
                  | EQuery _ => unsupported "Query"
                  | EDml _ => unsupported "DML"
                  | ENextval _ => unsupported "Nextval"
                  | EUnurlify _ => unsupported "EUnurlify"
                  | EJavaScript _ => unsupported "Nested JavaScript"
                  | ESignalReturn e =>
                    let
                        val (e, st) = jsE inner (e, st)
                    in
                        (strcat [str "sr(",
                                 e,
                                 str ")"],
                         st)
                    end
                  | ESignalBind (e1, e2) =>
                    let
                        val (e1, st) = jsE inner (e1, st)
                        val (e2, st) = jsE inner (e2, st)
                    in
                        (strcat [str "sb(",
                                 e1,
                                 str ",",
                                 e2,
                                 str ")"],
                         st)
                    end
                  | ESignalSource e =>
                    let
                        val (e, st) = jsE inner (e, st)
                    in
                        (strcat [str "ss(",
                                 e,
                                 str ")"],
                         st)
                    end
            end
    in
        jsE
    end

val decl : state -> decl -> decl * state =
    U.Decl.foldMapB {typ = fn x => x,
                     exp = fn (env, e, st) =>
                              let
                                  fun doCode m env orig e =
                                      let
                                          val len = length env
                                          fun str s = (EPrim (Prim.String s), #2 e)

                                          val locals = List.tabulate
                                                           (varDepth e,
                                                         fn i => str ("var uwr" ^ Int.toString (len + i) ^ ";"))
                                          val (e, st) = jsExp m env 0 (e, st)
                                      in
                                          (EJavaScript (m, orig, SOME (strcat (#2 e) (locals @ [e]))), st)
                                      end
                              in
                                  case e of
                                      EJavaScript (m, orig as (EAbs (_, t, _, e), _), _) => doCode m (t :: env) orig e
                                    | EJavaScript (m, e, _) => doCode m env e e
                                    | _ => (e, st)
                              end,
                     decl = fn (_, e, st) => (e, st),
                     bind = fn (env, U.Decl.RelE (_, t)) => t :: env
                             | (env, _) => env}
                    []

fun process file =
    let
        fun doDecl (d, st) =
            let
                val (d, st) = decl st d
            in
                (List.revAppend (#decls st, [d]),
                 {decls = [],
                  script = #script st})
            end

        val (ds, st) = ListUtil.foldlMapConcat doDecl
                       {decls = [],
                        script = ""}
                       file

        val inf = TextIO.openIn (OS.Path.joinDirFile {dir = Config.libJs, file = "urweb.js"})
        fun lines acc =
            case TextIO.inputLine inf of
                NONE => String.concat (rev acc)
              | SOME line => lines (line :: acc)
        val lines = lines []
    in
        TextIO.closeIn inf;
        (DJavaScript lines, ErrorMsg.dummySpan) :: ds
    end

end