summaryrefslogtreecommitdiff
path: root/src/core_env.sml
blob: e8cd139f91222b5b81a95ec48cc723618f7b7690 (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
(* 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 CoreEnv :> CORE_ENV = struct

open Core

structure U = CoreUtil

structure IM = IntBinaryMap


(* AST utility functions *)

val liftKindInKind =
    U.Kind.mapB {kind = fn bound => fn k =>
                                       case k of
                                           KRel xn =>
                                           if xn < bound then
                                               k
                                           else
                                               KRel (xn + 1)
                                         | _ => k,
                 bind = fn (bound, _) => bound + 1}

val liftKindInCon =
    U.Con.mapB {kind = fn bound => fn k =>
                                      case k of
                                          KRel xn =>
                                          if xn < bound then
                                              k
                                          else
                                              KRel (xn + 1)
                                        | _ => k,
                con = fn _ => fn c => c,
                bind = fn (bound, U.Con.RelK _) => bound + 1
                        | (bound, _) => bound}

val liftKindInExp =
    U.Exp.mapB {kind = fn bound => fn k =>
                                      case k of
                                          KRel xn =>
                                          if xn < bound then
                                              k
                                          else
                                              KRel (xn + 1)
                                        | _ => k,
                con = fn _ => fn c => c,
                exp = fn _ => fn e => e,
                bind = fn (bound, U.Exp.RelK _) => bound + 1
                        | (bound, _) => bound}
    
val liftConInCon =
    U.Con.mapB {kind = fn _ => fn k => k,
                con = fn bound => fn c =>
                                     case c of
                                         CRel xn =>
                                         if xn < bound then
                                             c
                                         else
                                             CRel (xn + 1)
                                       | _ => c,
                bind = fn (bound, U.Con.RelC _) => bound + 1
                        | (bound, _) => bound}

val lift = liftConInCon 0

val subConInCon =
    U.Con.mapB {kind = fn _ => fn k => k,
                con = fn (xn, rep) => fn c =>
                                  case c of
                                      CRel xn' =>
                                      (case Int.compare (xn', xn) of
                                           EQUAL => #1 rep
                                         | GREATER => CRel (xn' - 1)
                                         | LESS => c)
                                    | _ => c,
                bind = fn ((xn, rep), U.Con.RelC _) => (xn+1, liftConInCon 0 rep)
                        | (ctx, _) => ctx}


val liftConInExp =
    U.Exp.mapB {kind = fn _ => fn k => k,
                con = fn bound => fn c =>
                                     case c of
                                         CRel xn =>
                                         if xn < bound then
                                             c
                                         else
                                             CRel (xn + 1)
                                       | _ => c,
                exp = fn _ => fn e => e,
                bind = fn (bound, U.Exp.RelC _) => bound + 1
                        | (bound, _) => bound}

val subConInExp =
    U.Exp.mapB {kind = fn _ => fn k => k,
                con = fn (xn, rep) => fn c =>
                                         case c of
                                             CRel xn' =>
                                             (case Int.compare (xn', xn) of
                                                  EQUAL => #1 rep
                                                | GREATER => CRel (xn' - 1)
                                                | LESS => c)
                                           | _ => c,
                exp = fn _ => fn e => e,
                bind = fn ((xn, rep), U.Exp.RelC _) => (xn+1, liftConInCon 0 rep)
                        | (ctx, _) => ctx}

val liftExpInExp =
    U.Exp.mapB {kind = fn _ => fn k => k,
                con = fn _ => fn c => c,
                exp = fn bound => fn e =>
                                     case e of
                                         ERel xn =>
                                         if xn < bound then
                                             e
                                         else
                                             ERel (xn + 1)
                                       | _ => e,
                bind = fn (bound, U.Exp.RelE _) => bound + 1
                        | (bound, _) => bound}

val subExpInExp =
    U.Exp.mapB {kind = fn _ => fn k => k,
                con = fn _ => fn c => c,
                exp = fn (xn, rep) => fn e =>
                                  case e of
                                      ERel xn' =>
                                      (case Int.compare (xn', xn) of
                                           EQUAL => #1 rep
                                         | GREATER=> ERel (xn' - 1)
                                         | LESS => e)
                                    | _ => e,
                bind = fn ((xn, rep), U.Exp.RelE _) => (xn+1, liftExpInExp 0 rep)
                        | ((xn, rep), U.Exp.RelC _) => (xn, liftConInExp 0 rep)
                        | (ctx, _) => ctx}

(* Back to environments *)

exception UnboundRel of int
exception UnboundNamed of int

type env = {
     relK : string list,

     relC : (string * kind) list,
     namedC : (string * kind * con option) IM.map,

     datatypes : (string * string list * (string * int * con option) list) IM.map,
     constructors : (string * string list * con option * int) IM.map,

     relE : (string * con) list,
     namedE : (string * con * exp option * string) IM.map
}

val empty = {
    relK = [],

    relC = [],
    namedC = IM.empty,

    datatypes = IM.empty,
    constructors = IM.empty,

    relE = [],
    namedE = IM.empty
}

fun pushKRel (env : env) x =
    {relK = x :: #relK env,

     relC = map (fn (x, k) => (x, liftKindInKind 0 k)) (#relC env),
     namedC = #namedC env,

     relE = map (fn (x, c) => (x, liftKindInCon 0 c)) (#relE env),
     namedE = #namedE env,

     datatypes = #datatypes env,
     constructors = #constructors env
    }

fun lookupKRel (env : env) n =
    (List.nth (#relK env, n))
    handle Subscript => raise UnboundRel n

fun pushCRel (env : env) x k =
    {relK = #relK env,

     relC = (x, k) :: #relC env,
     namedC = IM.map (fn (x, k, co) => (x, k, Option.map lift co)) (#namedC env),

     datatypes = #datatypes env,
     constructors = #constructors env,

     relE = map (fn (x, c) => (x, lift c)) (#relE env),
     namedE = IM.map (fn (x, c, eo, s) => (x, lift c, eo, s)) (#namedE env)}

fun lookupCRel (env : env) n =
    (List.nth (#relC env, n))
    handle Subscript => raise UnboundRel n

fun pushCNamed (env : env) x n k co =
    {relK = #relK env,

     relC = #relC env,
     namedC = IM.insert (#namedC env, n, (x, k, co)),

     datatypes = #datatypes env,
     constructors = #constructors env,
     
     relE = #relE env,
     namedE = #namedE env}

fun lookupCNamed (env : env) n =
    case IM.find (#namedC env, n) of
        NONE => raise UnboundNamed n
      | SOME x => x

fun pushDatatype (env : env) x n xs xncs =
    {relK = #relK env,

     relC = #relC env,
     namedC = #namedC env,

     datatypes = IM.insert (#datatypes env, n, (x, xs, xncs)),
     constructors = foldl (fn ((x, n', to), constructors) =>
                              IM.insert (constructors, n', (x, xs, to, n)))
                          (#constructors env) xncs,
     
     relE = #relE env,
     namedE = #namedE env}

fun lookupDatatype (env : env) n =
    case IM.find (#datatypes env, n) of
        NONE => raise UnboundNamed n
      | SOME x => x

fun lookupConstructor (env : env) n =
    case IM.find (#constructors env, n) of
        NONE => raise UnboundNamed n
      | SOME x => x

fun pushERel (env : env) x t =
    {relK = #relK env,

     relC = #relC env,
     namedC = #namedC env,

     datatypes = #datatypes env,
     constructors = #constructors env,

     relE = (x, t) :: #relE env,
     namedE = #namedE env}

fun lookupERel (env : env) n =
    (List.nth (#relE env, n))
    handle Subscript => raise UnboundRel n

fun pushENamed (env : env) x n t eo s =
    {relK = #relK env,

     relC = #relC env,
     namedC = #namedC env,

     datatypes = #datatypes env,
     constructors = #constructors env,

     relE = #relE env,
     namedE = IM.insert (#namedE env, n, (x, t, eo, s))}

fun lookupENamed (env : env) n =
    case IM.find (#namedE env, n) of
        NONE => raise UnboundNamed n
      | SOME x => x

fun declBinds env (d, loc) =
    case d of
        DCon (x, n, k, c) => pushCNamed env x n k (SOME c)
      | DDatatype dts =>
        foldl (fn ((x, n, xs, xncs), env) =>
                  let
                      val env = pushDatatype env x n xs xncs
                      val env = pushCNamed env x n (KType, loc) NONE
                  in
                      foldl (fn ((x', n', NONE), env) => pushENamed env x' n' (CNamed n, loc) NONE ""
                              | ((x', n', SOME t), env) => pushENamed env x' n' (TFun (t, (CNamed n, loc)), loc) NONE "")
                            env xncs
                  end) env dts
      | DVal (x, n, t, e, s) => pushENamed env x n t (SOME e) s
      | DValRec vis => foldl (fn ((x, n, t, e, s), env) => pushENamed env x n t NONE s) env vis
      | DExport _ => env
      | DTable (x, n, c, s, _, pc, _, cc) =>
        let
            val ct = (CFfi ("Basis", "sql_table"), loc)
            val ct = (CApp (ct, c), loc)
            val ct = (CApp (ct, (CConcat (pc, cc), loc)), loc)
        in
            pushENamed env x n ct NONE s
        end
      | DSequence (x, n, s) =>
        let
            val t = (CFfi ("Basis", "sql_sequence"), loc)
        in
            pushENamed env x n t NONE s
        end
      | DView (x, n, s, _, c) =>
        let
            val ct = (CFfi ("Basis", "sql_view"), loc)
            val ct = (CApp (ct, c), loc)
        in
            pushENamed env x n ct NONE s
        end
      | DDatabase _ => env
      | DCookie (x, n, c, s) =>
        let
            val t = (CApp ((CFfi ("Basis", "http_cookie"), loc), c), loc)
        in
            pushENamed env x n t NONE s
        end
      | DStyle (x, n, s) =>
        let
            val t = (CFfi ("Basis", "css_class"), loc)
        in
            pushENamed env x n t NONE s
        end

fun patBinds env (p, loc) =
    case p of
        PWild => env
      | PVar (x, t) => pushERel env x t
      | PPrim _ => env
      | PCon (_, _, _, NONE) => env
      | PCon (_, _, _, SOME p) => patBinds env p
      | PRecord xps => foldl (fn ((_, p, _), env) => patBinds env p) env xps

fun patBindsN (p, loc) =
    case p of
        PWild => 0
      | PVar _ => 1
      | PPrim _ => 0
      | PCon (_, _, _, NONE) => 0
      | PCon (_, _, _, SOME p) => patBindsN p
      | PRecord xps => foldl (fn ((_, p, _), count) => count + patBindsN p) 0 xps

end