summaryrefslogtreecommitdiff
path: root/MLKDynamicContext.m
blob: 6d135a4edc9b763de98a497ad19fdffe4e69a09d (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
/* -*- mode: objc; coding: utf-8 -*- */
/* Étoilisp/Mulklisp, a Common Lisp subset for the Étoilé runtime.
 * Copyright (C) 2008  Matthias Andreas Benkard.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#import <Foundation/NSArray.h>
#import <Foundation/NSDictionary.h>
#import <Foundation/NSNull.h>
#import <Foundation/NSSet.h>
#import <Foundation/NSString.h>
#import <Foundation/NSThread.h>

#import "MLKCons.h"
#import "MLKDynamicContext.h"
#import "MLKEnvironment.h"
#import "MLKLinkedList.h"
#import "MLKPackage.h"
#import "MLKReadtable.h"
#import "MLKSymbol.h"
#import "MLKInteger.h"


#define MAKE_ENVIRONMENT(variable, parent, parent_member)               \
  (variable                                                             \
   ? (id) [[MLKEnvironment alloc]                                       \
            initWithParent:(parent                                      \
                            ? (id) parent_member                        \
                            : nil)                                      \
                  bindings:vars]                                        \
   : (id) (parent ? (id) RETAIN (parent_member) : nil));


static MLKDynamicContext *global_context;


@implementation MLKDynamicContext
+(void) initialize
{
  NSMutableDictionary *vars = [NSMutableDictionary dictionaryWithCapacity:64];
  MLKPackage *cl = [MLKPackage packageWithName:@"COMMON-LISP"
                               nicknames:[NSSet setWithObject:@"CL"]];
  MLKPackage *clUser = [MLKPackage packageWithName:@"COMMON-LISP-USER"
                                   nicknames:[NSSet setWithObject:@"CL-USER"]];
  MLKPackage *keyword = [MLKPackage packageWithName:@"KEYWORD"
                                    nicknames:[NSSet set]];
  MLKSymbol *t = [cl intern:@"T"];
  MLKReadtable *readtable = [[MLKReadtable alloc] init];
  unichar ch;

  id NIL = [NSNull null];

  // Build the initial readtable.
  [readtable setSyntaxType:WHITESPACE forCharacter:'\t'];
  [readtable setConstituentTrait:INVALID forCharacter:'\t'];
  [readtable setSyntaxType:WHITESPACE forCharacter:'\n'];
  [readtable setConstituentTrait:INVALID forCharacter:'\n'];
  [readtable setSyntaxType:WHITESPACE forCharacter:'\f'];  // linefeed == newline?
  [readtable setConstituentTrait:INVALID forCharacter:'\f'];
  [readtable setSyntaxType:WHITESPACE forCharacter:'\r'];
  [readtable setConstituentTrait:INVALID forCharacter:'\r'];
  [readtable setSyntaxType:WHITESPACE forCharacter:' '];
  [readtable setConstituentTrait:INVALID forCharacter:' '];
  //  [readtable setSyntaxType:WHITESPACE forCharacter:'\Page'];
  //  [readtable setConstituentTrait:INVALID forCharacter:'\Page'];

  [readtable setSyntaxType:CONSTITUENT forCharacter:'\b'];
  [readtable setConstituentTrait:INVALID forCharacter:'\b'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'\177'];  // Rubout
  [readtable setConstituentTrait:INVALID forCharacter:'\177'];

  [readtable setSyntaxType:CONSTITUENT forCharacter:':'];
  [readtable setConstituentTrait:PACKAGE_MARKER forCharacter:':'];
  [readtable unsetConstituentTrait:ALPHABETIC forCharacter:':'];

  [readtable setSyntaxType:CONSTITUENT forCharacter:'<'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'='];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'>'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'?'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'!'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'@'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'['];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'$'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'%'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:']'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'&'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'^'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'_'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'*'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'{'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'}'];
  [readtable setSyntaxType:CONSTITUENT forCharacter:'~'];

  [readtable setSyntaxType:CONSTITUENT forCharacter:'+'];
  [readtable setConstituentTrait:PLUS_SIGN forCharacter:'+'];
  [readtable setConstituentTrait:SIGN forCharacter:'+'];

  [readtable setSyntaxType:CONSTITUENT forCharacter:'-'];
  [readtable setConstituentTrait:MINUS_SIGN forCharacter:'-'];
  [readtable setConstituentTrait:SIGN forCharacter:'-'];
  
  [readtable setSyntaxType:CONSTITUENT forCharacter:'.'];
  [readtable setConstituentTrait:DOT forCharacter:'.'];
  [readtable setConstituentTrait:DECIMAL_POINT forCharacter:'.'];
  
  [readtable setSyntaxType:CONSTITUENT forCharacter:'/'];
  [readtable setConstituentTrait:RATIO_MARKER forCharacter:'/'];
  
  // Maybe distinguish different types of exponent markers as the CLHS
  // does?  For now, the MLKFloat class cluster's string-parsing
  // constructor does the discrimination.
  [readtable setConstituentTrait:EXPONENT_MARKER forCharacter:'d'];
  [readtable setConstituentTrait:EXPONENT_MARKER forCharacter:'e'];
  [readtable setConstituentTrait:EXPONENT_MARKER forCharacter:'f'];
  [readtable setConstituentTrait:EXPONENT_MARKER forCharacter:'l'];
  [readtable setConstituentTrait:EXPONENT_MARKER forCharacter:'s'];
  [readtable setConstituentTrait:EXPONENT_MARKER forCharacter:'D'];
  [readtable setConstituentTrait:EXPONENT_MARKER forCharacter:'E'];
  [readtable setConstituentTrait:EXPONENT_MARKER forCharacter:'F'];
  [readtable setConstituentTrait:EXPONENT_MARKER forCharacter:'L'];
  [readtable setConstituentTrait:EXPONENT_MARKER forCharacter:'S'];
  
  [readtable setConstituentTrait:NUMBER_MARKER forCharacter:'d'];
  [readtable setConstituentTrait:NUMBER_MARKER forCharacter:'e'];
  [readtable setConstituentTrait:NUMBER_MARKER forCharacter:'f'];
  [readtable setConstituentTrait:NUMBER_MARKER forCharacter:'l'];
  [readtable setConstituentTrait:NUMBER_MARKER forCharacter:'s'];
  [readtable setConstituentTrait:NUMBER_MARKER forCharacter:'D'];
  [readtable setConstituentTrait:NUMBER_MARKER forCharacter:'E'];
  [readtable setConstituentTrait:NUMBER_MARKER forCharacter:'F'];
  [readtable setConstituentTrait:NUMBER_MARKER forCharacter:'L'];
  [readtable setConstituentTrait:NUMBER_MARKER forCharacter:'S'];

  [readtable setSyntaxType:MULTI_ESCAPE forCharacter:'|'];
  
  //  [readtable setSyntaxType:TERMINATING_MACRO forCharacter:';'];
  //  [readtable setSyntaxType:TERMINATING_MACRO forCharacter:'"'];
  //  [readtable setSyntaxType:NONTERMINATING_MACRO forCharacter:'#'];
  //  [readtable setSyntaxType:TERMINATING_MACRO forCharacter:'\''];
  //  [readtable setSyntaxType:TERMINATING_MACRO forCharacter:'('];
  //  [readtable setSyntaxType:TERMINATING_MACRO forCharacter:'`'];
  //  [readtable setSyntaxType:TERMINATING_MACRO forCharacter:')'];
  //  [readtable setSyntaxType:TERMINATING_MACRO forCharacter:','];

  [readtable setSyntaxType:SINGLE_ESCAPE forCharacter:'\\'];

  for (ch = '0'; ch <= '9'; ch++)
    {
      [readtable setSyntaxType:CONSTITUENT forCharacter:ch];
      [readtable setConstituentTrait:ALPHA_DIGIT forCharacter:ch];
      [readtable unsetConstituentTrait:ALPHABETIC forCharacter:ch];
    }
  
  for (ch = 'A'; ch <= 'Z'; ch++)
    {
      [readtable setSyntaxType:CONSTITUENT forCharacter:ch];
      [readtable setConstituentTrait:ALPHA_DIGIT forCharacter:ch];
      [readtable unsetConstituentTrait:ALPHABETIC forCharacter:ch];
    }
  
  for (ch = 'a'; ch <= 'z'; ch++)
    {
      [readtable setSyntaxType:CONSTITUENT forCharacter:ch];
      [readtable setConstituentTrait:ALPHA_DIGIT forCharacter:ch];
      [readtable unsetConstituentTrait:ALPHABETIC forCharacter:ch];
    }


  // FIXME: Initialise stuff.
#define INIT(VARNAME, VALUE) [vars setObject:VALUE forKey:[cl intern:VARNAME]]

  INIT(@"*BREAK-ON-SIGNALS*", NIL);
  INIT(@"*COMPILE-FILE-PATHNAME*", NIL);
  INIT(@"*COMPILE-FILE-TRUENAME*", NIL);
  INIT(@"*COMPILE-PRINT*", NIL);
  INIT(@"*COMPILE-VERBOSE*", t);
  //  INIT(@"*DEBUG-IO*", );
  INIT(@"*DEBUGGER-HOOK*", NIL);
  //  INIT(@"*DEFAULT-PATHNAME-DEFAULTS*", );
  //  INIT(@"*ERROR-OUTPUT*", );
  INIT(@"*FEATURES*", [MLKCons
                        cons:[keyword intern:@"ETOILET"]
                        with:[MLKCons
                               cons:[keyword intern:@"COMMON-LISP"]
                               with:[MLKCons
                                      cons:[keyword intern:@"ANSI-CL"]
                                      with:nil]]]);
  INIT(@"*GENSYM-COUNTER*", [MLKInteger integerWithInt:0]);
  INIT(@"*LOAD-PATHNAME*", NIL);
  INIT(@"*LOAD-PRINT*", NIL);
  INIT(@"*LOAD-TRUENAME*", NIL);
  INIT(@"*LOAD-VERBOSE*", t);
  //  INIT(@"*MACROEXPAND-HOOK*", );
  INIT(@"*MODULES*", NIL);
  INIT(@"*PACKAGE*", clUser);
  INIT(@"*PRINT-ARRAY*", t);
  INIT(@"*PRINT-BASE*", [MLKInteger integerWithInt:10]);
  INIT(@"*PRINT-CASE*", [keyword intern:@"UPCASE"]);
  INIT(@"*PRINT-CIRCLE*", NIL);
  INIT(@"*PRINT-ESCAPE*", t);
  INIT(@"*PRINT-GENSYM*", t);
  INIT(@"*PRINT-LENGTH*", NIL);
  INIT(@"*PRINT-LEVEL*", NIL);
  INIT(@"*PRINT-LINES*", NIL);
  INIT(@"*PRINT-MISER-WIDTH*", NIL);
  //  INIT(@"*PRINT-PPRINT-DISPATCH*", );
  INIT(@"*PRINT-PRETTY*", t);
  INIT(@"*PRINT-RADIX*", NIL);
  INIT(@"*PRINT-READABLY*", NIL);
  INIT(@"*PRINT-RIGHT-MARGIN*", NIL);
  //  INIT(@"*QUERY-IO*", );
  //  INIT(@"*RANDOM-STATE*", );
  INIT(@"*READ-BASE*", [MLKInteger integerWithInt:10]);
  INIT(@"*READ-DEFAULT-FLOAT-FORMAT*", [cl intern:@"SINGLE-FLOAT"]);
  INIT(@"*READ-EVAL*", t);
  INIT(@"*READ-SUPPRESS*", NIL);  //FIXME: Support in reader
  INIT(@"*READTABLE*", readtable);
  //  INIT(@"*STANDARD-INPUT*", );
  //  INIT(@"*STANDARD-OUTPUT*", );
  //  INIT(@"*TERMINAL-IO*", );
  //  INIT(@"*TRACE-OUTPUT* ", );

  global_context = [[self alloc] initWithParent:nil
                                 variables:vars
                                 handlers:nil
                                 restarts:nil
                                 catchTags:nil
                                 activeHandlerEnvironment:nil];
}

-(MLKDynamicContext *) initWithParent:(MLKDynamicContext *)aContext
                            variables:(NSDictionary *)vars
                             handlers:(NSDictionary *)handlers
                             restarts:(NSDictionary *)restarts
                            catchTags:(NSDictionary *)catchTags
             activeHandlerEnvironment:(MLKEnvironment *)handlerEnv;
{
  self = [super init];
  ASSIGN (_parent, (aContext ? aContext : [MLKDynamicContext currentContext]));
  _environment = MAKE_ENVIRONMENT(vars, _parent, _parent->_environment);
  _conditionHandlers = MAKE_ENVIRONMENT(handlers,
                                        _parent,
                                        _parent->_conditionHandlers);
  _restarts = MAKE_ENVIRONMENT(restarts, _parent, _parent->_restarts);
  _catchTags = MAKE_ENVIRONMENT(catchTags, _parent, _parent->_catchTags);
  ASSIGN (_activeHandlerEnvironment,
          handlerEnv
          ? (id) handlerEnv
          : (_parent
             ? (id) (_parent->_activeHandlerEnvironment)
             : nil));
  return self;
}

+(MLKDynamicContext *) globalContext
{
  return global_context;
}

-(MLKDynamicContext *) pushContext
{
  [[[NSThread currentThread] threadDictionary] setObject:self
                                               forKey:@"MLKDynamicContext"];
  return self;
}

+(MLKDynamicContext *) currentContext
{
  MLKDynamicContext *context = [[[NSThread currentThread] threadDictionary]
                                 objectForKey:@"MLKDynamicContext"];
  if (context)
    return context;
  else
    return global_context;
}

+(MLKDynamicContext *) popContext
{
  MLKDynamicContext *context = [self currentContext];
  [[[NSThread currentThread] threadDictionary] setObject:context->_parent
                                               forKey:@"MLKDynamicContext"];
  return context;
}

-(MLKEnvironment *) environment
{
  return _environment;
}

-(id) findRestart:(MLKSymbol *)symbol
{
  NS_DURING
    {
      return [_restarts valueForBinding:symbol];
    }
  NS_HANDLER
    {
      if ([[localException name] isEqualToString: @"MLKUndefinedVariableException"])
        NS_VALUERETURN (nil, id);
      else
        [localException raise];
    }
  NS_ENDHANDLER;

  return nil;
}

-(id) findHandler:(MLKSymbol *)symbol
{
  NS_DURING
    {
      if (_activeHandlerEnvironment)
        return [[_activeHandlerEnvironment parent] valueForBinding:symbol];
      else
        return [_conditionHandlers valueForBinding:symbol];
    }
  NS_HANDLER
    {
      if ([[localException name] isEqualToString: @"MLKUndefinedVariableException"])
        NS_VALUERETURN (nil, id);
      else
        [localException raise];
    }
  NS_ENDHANDLER;

  return nil;
}

-(id) findCatchTag:(MLKSymbol *)symbol
{
  NS_DURING
    {
      return [_catchTags valueForBinding:symbol];
    }
  NS_HANDLER
    {
      if ([[localException name] isEqualToString: @"MLKUndefinedVariableException"])
        NS_VALUERETURN (nil, id);
      else
        [localException raise];
    }
  NS_ENDHANDLER;

  return nil;
}

-(id) valueForBinding:(MLKSymbol *)symbol
{
  return [[self environment] valueForBinding:symbol];
}

-(void) setValue:(id)value forBinding:(MLKSymbol *)symbol
{
  [[self environment] setValue:value forBinding:symbol];
}

-(void) addValue:(id)value forBinding:(MLKSymbol *)symbol
{
  [[self environment] addValue:value forBinding:symbol];
}

-(void) addBinding:(MLKSymbol *)symbol
{
  [[self environment] addBinding:symbol];
}

-(BOOL) boundp:(MLKSymbol *)symbol
{
  return [[self environment] boundp:symbol];
}

-(void) makunbound:(MLKSymbol *)symbol
{
  [[self environment] makunbound:symbol];
}

-(void) dealloc
{
  RELEASE (_conditionHandlers);
  RELEASE (_restarts);
  RELEASE (_catchTags);
  RELEASE (_activeHandlerEnvironment);
  RELEASE (_environment);
  RELEASE (_parent);
  [super dealloc];
}
@end