Commit | Line | Data |
---|---|---|
70f29a2b JM |
1 | REM POKE 1, PEEK(1)AND248: REM enable all ROM areas as RAM |
2 | REM POKE 55,0: POKE 56,192: CLR: REM move BASIC end from $A000 to $C000 | |
3 | GOTO MAIN | |
4 | ||
5 | REM $INCLUDE: 'readline.in.bas' | |
6 | REM $INCLUDE: 'types.in.bas' | |
7 | REM $INCLUDE: 'reader.in.bas' | |
8 | REM $INCLUDE: 'printer.in.bas' | |
9 | REM $INCLUDE: 'env.in.bas' | |
10 | REM $INCLUDE: 'core.in.bas' | |
11 | ||
12 | REM $INCLUDE: 'debug.in.bas' | |
13 | ||
cc9dbd92 | 14 | REM READ(A$) -> R |
70f29a2b JM |
15 | MAL_READ: |
16 | GOSUB READ_STR | |
17 | RETURN | |
18 | ||
cc9dbd92 | 19 | REM PAIR_Q(B) -> R |
70f29a2b | 20 | PAIR_Q: |
cc9dbd92 | 21 | R=0 |
bbab5c5d | 22 | IF (Z%(B,0)AND31)<>6 AND (Z%(B,0)AND31)<>7 THEN RETURN |
cc9dbd92 JM |
23 | IF (Z%(B,1)=0) THEN RETURN |
24 | R=1 | |
70f29a2b JM |
25 | RETURN |
26 | ||
cc9dbd92 | 27 | REM QUASIQUOTE(A) -> R |
70f29a2b | 28 | QUASIQUOTE: |
cc9dbd92 JM |
29 | B=A:GOSUB PAIR_Q |
30 | IF R=1 THEN GOTO QQ_UNQUOTE | |
70f29a2b | 31 | REM ['quote, ast] |
cc9dbd92 | 32 | AS$="quote":T=5:GOSUB STRING |
bbab5c5d JM |
33 | B2=R:B1=A:GOSUB LIST2 |
34 | AY=B2:GOSUB RELEASE | |
70f29a2b JM |
35 | |
36 | RETURN | |
37 | ||
38 | QQ_UNQUOTE: | |
cc9dbd92 | 39 | R=A+1:GOSUB DEREF_R |
bbab5c5d | 40 | IF (Z%(R,0)AND31)<>5 THEN GOTO QQ_SPLICE_UNQUOTE |
cc9dbd92 | 41 | IF S$(Z%(R,1))<>"unquote" THEN GOTO QQ_SPLICE_UNQUOTE |
70f29a2b | 42 | REM [ast[1]] |
cc9dbd92 | 43 | R=Z%(A,1)+1:GOSUB DEREF_R |
bbab5c5d | 44 | Z%(R,0)=Z%(R,0)+32 |
70f29a2b JM |
45 | |
46 | RETURN | |
47 | ||
48 | QQ_SPLICE_UNQUOTE: | |
cc9dbd92 | 49 | REM push A on the stack |
bbab5c5d | 50 | X=X+1:X%(X)=A |
70f29a2b | 51 | REM rest of cases call quasiquote on ast[1..] |
cc9dbd92 JM |
52 | A=Z%(A,1):GOSUB QUASIQUOTE:T6=R |
53 | REM pop A off the stack | |
bbab5c5d | 54 | A=X%(X):X=X-1 |
cc9dbd92 JM |
55 | |
56 | REM set A to ast[0] for last two cases | |
57 | A=A+1:GOSUB DEREF_A | |
58 | ||
59 | B=A:GOSUB PAIR_Q | |
60 | IF R=0 THEN GOTO QQ_DEFAULT | |
61 | B=A+1:GOSUB DEREF_B | |
bbab5c5d | 62 | IF (Z%(B,0)AND31)<>5 THEN GOTO QQ_DEFAULT |
cc9dbd92 | 63 | IF S$(Z%(B,1))<>"splice-unquote" THEN QQ_DEFAULT |
70f29a2b JM |
64 | REM ['concat, ast[0][1], quasiquote(ast[1..])] |
65 | ||
bbab5c5d JM |
66 | B=Z%(A,1)+1:GOSUB DEREF_B:B2=B |
67 | AS$="concat":T=5:GOSUB STRING:B3=R | |
68 | B1=T6:GOSUB LIST3 | |
70f29a2b | 69 | REM release inner quasiquoted since outer list takes ownership |
bbab5c5d JM |
70 | AY=B1:GOSUB RELEASE |
71 | AY=B3:GOSUB RELEASE | |
70f29a2b JM |
72 | RETURN |
73 | ||
74 | QQ_DEFAULT: | |
75 | REM ['cons, quasiquote(ast[0]), quasiquote(ast[1..])] | |
76 | ||
cc9dbd92 | 77 | REM push T6 on the stack |
bbab5c5d | 78 | X=X+1:X%(X)=T6 |
cc9dbd92 | 79 | REM A set above to ast[0] |
bbab5c5d | 80 | GOSUB QUASIQUOTE:B2=R |
cc9dbd92 | 81 | REM pop T6 off the stack |
bbab5c5d | 82 | T6=X%(X):X=X-1 |
70f29a2b | 83 | |
bbab5c5d JM |
84 | AS$="cons":T=5:GOSUB STRING:B3=R |
85 | B1=T6:GOSUB LIST3 | |
70f29a2b | 86 | REM release inner quasiquoted since outer list takes ownership |
bbab5c5d JM |
87 | AY=B1:GOSUB RELEASE |
88 | AY=B2:GOSUB RELEASE | |
89 | AY=B3:GOSUB RELEASE | |
70f29a2b JM |
90 | RETURN |
91 | ||
cc9dbd92 | 92 | REM MACROEXPAND(A, E) -> A: |
70f29a2b | 93 | MACROEXPAND: |
cc9dbd92 | 94 | REM push original A |
bbab5c5d | 95 | X=X+1:X%(X)=A |
70f29a2b JM |
96 | |
97 | MACROEXPAND_LOOP: | |
98 | REM list? | |
bbab5c5d | 99 | IF (Z%(A,0)AND31)<>6 THEN GOTO MACROEXPAND_DONE |
70f29a2b | 100 | REM non-empty? |
cc9dbd92 JM |
101 | IF Z%(A,1)=0 THEN GOTO MACROEXPAND_DONE |
102 | B=A+1:GOSUB DEREF_B | |
70f29a2b | 103 | REM symbol? in first position |
bbab5c5d | 104 | IF (Z%(B,0)AND31)<>5 THEN GOTO MACROEXPAND_DONE |
70f29a2b | 105 | REM defined in environment? |
cc9dbd92 JM |
106 | K=B:GOSUB ENV_FIND |
107 | IF R=-1 THEN GOTO MACROEXPAND_DONE | |
108 | B=T4:GOSUB DEREF_B | |
70f29a2b | 109 | REM macro? |
bbab5c5d | 110 | IF (Z%(B,0)AND31)<>11 THEN GOTO MACROEXPAND_DONE |
70f29a2b JM |
111 | |
112 | REM apply | |
01e8850d JM |
113 | X=X+1:X%(X)=5: REM push APPLY return label/address |
114 | F=B:AR=Z%(A,1):GOTO APPLY | |
115 | REM APPLY return label/address popped by APPLY | |
116 | APPLY_RETURN_MACROEXPAND: | |
117 | ||
cc9dbd92 | 118 | A=R |
70f29a2b | 119 | |
bbab5c5d | 120 | AY=X%(X) |
cc9dbd92 | 121 | REM if previous A was not the first A into macroexpand (i.e. an |
70f29a2b | 122 | REM intermediate form) then free it |
bbab5c5d | 123 | IF A<>AY THEN Y=Y+1:Y%(Y,0)=A:Y%(Y,1)=LV |
70f29a2b | 124 | |
cc9dbd92 | 125 | IF ER<>-2 THEN GOTO MACROEXPAND_DONE |
70f29a2b JM |
126 | GOTO MACROEXPAND_LOOP |
127 | ||
128 | MACROEXPAND_DONE: | |
cc9dbd92 | 129 | X=X-1: REM pop original A |
70f29a2b JM |
130 | RETURN |
131 | ||
cc9dbd92 | 132 | REM EVAL_AST(A, E) -> R |
70f29a2b JM |
133 | REM called using GOTO to avoid basic return address stack usage |
134 | REM top of stack should have return label index | |
135 | EVAL_AST: | |
cc9dbd92 | 136 | REM push A and E on the stack |
bbab5c5d | 137 | X=X+2:X%(X-1)=E:X%(X)=A |
70f29a2b | 138 | |
cc9dbd92 | 139 | IF ER<>-2 THEN GOTO EVAL_AST_RETURN |
70f29a2b JM |
140 | |
141 | GOSUB DEREF_A | |
142 | ||
bbab5c5d | 143 | T=Z%(A,0)AND31 |
cc9dbd92 JM |
144 | IF T=5 THEN GOTO EVAL_AST_SYMBOL |
145 | IF T>=6 AND T<=8 THEN GOTO EVAL_AST_SEQ | |
70f29a2b JM |
146 | |
147 | REM scalar: deref to actual value and inc ref cnt | |
cc9dbd92 | 148 | R=A:GOSUB DEREF_R |
bbab5c5d | 149 | Z%(R,0)=Z%(R,0)+32 |
70f29a2b JM |
150 | GOTO EVAL_AST_RETURN |
151 | ||
152 | EVAL_AST_SYMBOL: | |
cc9dbd92 | 153 | K=A:GOSUB ENV_GET |
70f29a2b JM |
154 | GOTO EVAL_AST_RETURN |
155 | ||
156 | EVAL_AST_SEQ: | |
a742287e JM |
157 | REM allocate the first entry (T already set above) |
158 | L=0:N=0:GOSUB ALLOC | |
70f29a2b JM |
159 | |
160 | REM make space on the stack | |
cc9dbd92 | 161 | X=X+4 |
70f29a2b | 162 | REM push type of sequence |
bbab5c5d | 163 | X%(X-3)=T |
70f29a2b | 164 | REM push sequence index |
bbab5c5d | 165 | X%(X-2)=-1 |
70f29a2b | 166 | REM push future return value (new sequence) |
bbab5c5d | 167 | X%(X-1)=R |
70f29a2b | 168 | REM push previous new sequence entry |
bbab5c5d | 169 | X%(X)=R |
70f29a2b JM |
170 | |
171 | EVAL_AST_SEQ_LOOP: | |
70f29a2b | 172 | REM update index |
bbab5c5d | 173 | X%(X-2)=X%(X-2)+1 |
70f29a2b JM |
174 | |
175 | REM check if we are done evaluating the source sequence | |
cc9dbd92 | 176 | IF Z%(A,1)=0 THEN GOTO EVAL_AST_SEQ_LOOP_DONE |
70f29a2b | 177 | |
01e8850d JM |
178 | REM if we are returning to DO, then skip last element |
179 | IF X%(X-6)=2 AND Z%(Z%(A,1),1)=0 THEN GOTO EVAL_AST_SEQ_LOOP_DONE | |
180 | ||
70f29a2b | 181 | REM if hashmap, skip eval of even entries (keys) |
bbab5c5d | 182 | IF (X%(X-3)=8) AND ((X%(X-2) AND 1)=0) THEN GOTO EVAL_AST_DO_REF |
70f29a2b JM |
183 | GOTO EVAL_AST_DO_EVAL |
184 | ||
185 | EVAL_AST_DO_REF: | |
cc9dbd92 | 186 | R=A+1:GOSUB DEREF_R: REM deref to target of referred entry |
bbab5c5d | 187 | Z%(R,0)=Z%(R,0)+32: REM inc ref cnt of referred value |
70f29a2b JM |
188 | GOTO EVAL_AST_ADD_VALUE |
189 | ||
190 | EVAL_AST_DO_EVAL: | |
191 | REM call EVAL for each entry | |
cc9dbd92 JM |
192 | A=A+1:GOSUB EVAL |
193 | A=A-1 | |
70f29a2b JM |
194 | GOSUB DEREF_R: REM deref to target of evaluated entry |
195 | ||
196 | EVAL_AST_ADD_VALUE: | |
197 | ||
198 | REM update previous value pointer to evaluated entry | |
bbab5c5d | 199 | Z%(X%(X)+1,1)=R |
70f29a2b | 200 | |
cc9dbd92 | 201 | IF ER<>-2 THEN GOTO EVAL_AST_SEQ_LOOP_DONE |
70f29a2b JM |
202 | |
203 | REM allocate the next entry | |
a742287e | 204 | REM same new sequence entry type |
bbab5c5d | 205 | T=X%(X-3):L=0:N=0:GOSUB ALLOC |
70f29a2b JM |
206 | |
207 | REM update previous sequence entry value to point to new entry | |
bbab5c5d | 208 | Z%(X%(X),1)=R |
70f29a2b | 209 | REM update previous ptr to current entry |
bbab5c5d | 210 | X%(X)=R |
70f29a2b JM |
211 | |
212 | REM process the next sequence entry from source list | |
cc9dbd92 | 213 | A=Z%(A,1) |
70f29a2b JM |
214 | |
215 | GOTO EVAL_AST_SEQ_LOOP | |
216 | EVAL_AST_SEQ_LOOP_DONE: | |
217 | REM if no error, get return value (new seq) | |
bbab5c5d | 218 | IF ER=-2 THEN R=X%(X-1) |
70f29a2b | 219 | REM otherwise, free the return value and return nil |
bbab5c5d | 220 | IF ER<>-2 THEN R=0:AY=X%(X-1):GOSUB RELEASE |
70f29a2b JM |
221 | |
222 | REM pop previous, return, index and type | |
cc9dbd92 | 223 | X=X-4 |
70f29a2b JM |
224 | GOTO EVAL_AST_RETURN |
225 | ||
226 | EVAL_AST_RETURN: | |
cc9dbd92 | 227 | REM pop A and E off the stack |
bbab5c5d | 228 | E=X%(X-1):A=X%(X):X=X-2 |
70f29a2b JM |
229 | |
230 | REM pop EVAL AST return label/address | |
bbab5c5d JM |
231 | RN=X%(X):X=X-1 |
232 | ON RN GOTO EVAL_AST_RETURN_1,EVAL_AST_RETURN_2,EVAL_AST_RETURN_3 | |
70f29a2b | 233 | |
cc9dbd92 | 234 | REM EVAL(A, E)) -> R |
70f29a2b | 235 | EVAL: |
cc9dbd92 | 236 | LV=LV+1: REM track basic return stack level |
70f29a2b | 237 | |
cc9dbd92 | 238 | REM push A and E on the stack |
bbab5c5d | 239 | X=X+2:X%(X-1)=E:X%(X)=A |
70f29a2b | 240 | |
01e8850d JM |
241 | REM PRINT "EVAL A:"+STR$(A)+",X:"+STR$(X)+",LV:"+STR$(LV)+",FRE:"+STR$(FRE(0)) |
242 | ||
70f29a2b JM |
243 | EVAL_TCO_RECUR: |
244 | ||
cc9dbd92 JM |
245 | REM AZ=A:PR=1:GOSUB PR_STR |
246 | REM PRINT "EVAL: "+R$+" [A:"+STR$(A)+", LV:"+STR$(LV)+"]" | |
70f29a2b JM |
247 | |
248 | GOSUB DEREF_A | |
249 | ||
250 | GOSUB LIST_Q | |
cc9dbd92 | 251 | IF R THEN GOTO APPLY_LIST |
70f29a2b JM |
252 | EVAL_NOT_LIST: |
253 | REM ELSE | |
254 | REM push EVAL_AST return label/address | |
bbab5c5d | 255 | X=X+1:X%(X)=1 |
70f29a2b JM |
256 | GOTO EVAL_AST |
257 | EVAL_AST_RETURN_1: | |
258 | ||
259 | GOTO EVAL_RETURN | |
260 | ||
261 | APPLY_LIST: | |
262 | GOSUB MACROEXPAND | |
263 | ||
264 | GOSUB LIST_Q | |
cc9dbd92 | 265 | IF R<>1 THEN GOTO EVAL_NOT_LIST |
70f29a2b JM |
266 | |
267 | GOSUB EMPTY_Q | |
bbab5c5d | 268 | IF R THEN R=A:Z%(R,0)=Z%(R,0)+32:GOTO EVAL_RETURN |
70f29a2b | 269 | |
bbab5c5d JM |
270 | A0=A+1 |
271 | R=A0:GOSUB DEREF_R:A0=R | |
70f29a2b JM |
272 | |
273 | REM get symbol in A$ | |
bbab5c5d JM |
274 | IF (Z%(A0,0)AND31)<>5 THEN A$="" |
275 | IF (Z%(A0,0)AND31)=5 THEN A$=S$(Z%(A0,1)) | |
70f29a2b JM |
276 | |
277 | IF A$="def!" THEN GOTO EVAL_DEF | |
278 | IF A$="let*" THEN GOTO EVAL_LET | |
279 | IF A$="quote" THEN GOTO EVAL_QUOTE | |
280 | IF A$="quasiquote" THEN GOTO EVAL_QUASIQUOTE | |
281 | IF A$="defmacro!" THEN GOTO EVAL_DEFMACRO | |
282 | IF A$="macroexpand" THEN GOTO EVAL_MACROEXPAND | |
283 | IF A$="do" THEN GOTO EVAL_DO | |
284 | IF A$="if" THEN GOTO EVAL_IF | |
285 | IF A$="fn*" THEN GOTO EVAL_FN | |
286 | GOTO EVAL_INVOKE | |
287 | ||
288 | EVAL_GET_A3: | |
bbab5c5d JM |
289 | A3=Z%(Z%(Z%(A,1),1),1)+1 |
290 | R=A3:GOSUB DEREF_R:A3=R | |
70f29a2b | 291 | EVAL_GET_A2: |
bbab5c5d JM |
292 | A2=Z%(Z%(A,1),1)+1 |
293 | R=A2:GOSUB DEREF_R:A2=R | |
70f29a2b | 294 | EVAL_GET_A1: |
bbab5c5d JM |
295 | A1=Z%(A,1)+1 |
296 | R=A1:GOSUB DEREF_R:A1=R | |
70f29a2b JM |
297 | RETURN |
298 | ||
299 | EVAL_DEF: | |
300 | REM PRINT "def!" | |
bbab5c5d | 301 | GOSUB EVAL_GET_A2: REM set A1 and A2 |
70f29a2b | 302 | |
bbab5c5d JM |
303 | X=X+1:X%(X)=A1: REM push A1 |
304 | A=A2:GOSUB EVAL: REM eval a2 | |
305 | A1=X%(X):X=X-1: REM pop A1 | |
70f29a2b | 306 | |
cc9dbd92 | 307 | IF ER<>-2 THEN GOTO EVAL_RETURN |
70f29a2b JM |
308 | |
309 | REM set a1 in env to a2 | |
bbab5c5d | 310 | K=A1:V=R:GOSUB ENV_SET |
70f29a2b JM |
311 | GOTO EVAL_RETURN |
312 | ||
313 | EVAL_LET: | |
314 | REM PRINT "let*" | |
bbab5c5d | 315 | GOSUB EVAL_GET_A2: REM set A1 and A2 |
70f29a2b | 316 | |
bbab5c5d JM |
317 | X=X+1:X%(X)=A2: REM push/save A2 |
318 | X=X+1:X%(X)=E: REM push env for for later release | |
70f29a2b JM |
319 | |
320 | REM create new environment with outer as current environment | |
cc9dbd92 JM |
321 | O=E:GOSUB ENV_NEW |
322 | E=R | |
70f29a2b | 323 | EVAL_LET_LOOP: |
bbab5c5d | 324 | IF Z%(A1,1)=0 THEN GOTO EVAL_LET_LOOP_DONE |
70f29a2b | 325 | |
bbab5c5d | 326 | X=X+1:X%(X)=A1: REM push A1 |
70f29a2b | 327 | REM eval current A1 odd element |
bbab5c5d JM |
328 | A=Z%(A1,1)+1:GOSUB EVAL |
329 | A1=X%(X):X=X-1: REM pop A1 | |
70f29a2b | 330 | |
bbab5c5d JM |
331 | REM set environment: even A1 key to odd A1 eval'd above |
332 | K=A1+1:V=R:GOSUB ENV_SET | |
cc9dbd92 | 333 | AY=R:GOSUB RELEASE: REM release our use, ENV_SET took ownership |
70f29a2b | 334 | |
bbab5c5d JM |
335 | REM skip to the next pair of A1 elements |
336 | A1=Z%(Z%(A1,1),1) | |
70f29a2b JM |
337 | GOTO EVAL_LET_LOOP |
338 | ||
339 | EVAL_LET_LOOP_DONE: | |
bbab5c5d | 340 | E4=X%(X):X=X-1: REM pop previous env |
70f29a2b JM |
341 | |
342 | REM release previous environment if not the current EVAL env | |
bbab5c5d | 343 | IF E4<>X%(X-2) THEN AY=E4:GOSUB RELEASE |
70f29a2b | 344 | |
bbab5c5d JM |
345 | A2=X%(X):X=X-1: REM pop A2 |
346 | A=A2:GOTO EVAL_TCO_RECUR: REM TCO loop | |
70f29a2b JM |
347 | |
348 | EVAL_DO: | |
cc9dbd92 | 349 | A=Z%(A,1): REM rest |
01e8850d | 350 | X=X+1:X%(X)=A: REM push/save A |
70f29a2b JM |
351 | |
352 | REM push EVAL_AST return label/address | |
bbab5c5d | 353 | X=X+1:X%(X)=2 |
70f29a2b | 354 | GOTO EVAL_AST |
01e8850d | 355 | REM return label/address already popped by EVAL_AST |
70f29a2b JM |
356 | EVAL_AST_RETURN_2: |
357 | ||
01e8850d JM |
358 | REM cleanup |
359 | AY=R: REM get eval'd list for release | |
360 | ||
361 | A=X%(X):X=X-1: REM pop/restore original A for LAST | |
362 | GOSUB LAST: REM get last element for return | |
363 | A=R: REM new recur AST | |
364 | ||
365 | REM cleanup | |
366 | GOSUB RELEASE: REM release eval'd list | |
367 | AY=A:GOSUB RELEASE: REM release LAST value (not sure why) | |
368 | ||
369 | GOTO EVAL_TCO_RECUR: REM TCO loop | |
70f29a2b JM |
370 | |
371 | EVAL_QUOTE: | |
cc9dbd92 | 372 | R=Z%(A,1)+1:GOSUB DEREF_R |
bbab5c5d | 373 | Z%(R,0)=Z%(R,0)+32 |
70f29a2b JM |
374 | GOTO EVAL_RETURN |
375 | ||
376 | EVAL_QUASIQUOTE: | |
cc9dbd92 JM |
377 | R=Z%(A,1)+1:GOSUB DEREF_R |
378 | A=R:GOSUB QUASIQUOTE | |
70f29a2b | 379 | REM add quasiquote result to pending release queue to free when |
cc9dbd92 | 380 | REM next lower EVAL level returns (LV) |
bbab5c5d | 381 | Y=Y+1:Y%(Y,0)=R:Y%(Y,1)=LV |
70f29a2b | 382 | |
cc9dbd92 | 383 | A=R:GOTO EVAL_TCO_RECUR: REM TCO loop |
70f29a2b JM |
384 | |
385 | EVAL_DEFMACRO: | |
386 | REM PRINT "defmacro!" | |
bbab5c5d | 387 | GOSUB EVAL_GET_A2: REM set A1 and A2 |
70f29a2b | 388 | |
bbab5c5d JM |
389 | X=X+1:X%(X)=A1: REM push A1 |
390 | A=A2:GOSUB EVAL: REM eval A2 | |
391 | A1=X%(X):X=X-1: REM pop A1 | |
70f29a2b JM |
392 | |
393 | REM change function to macro | |
cc9dbd92 | 394 | Z%(R,0)=Z%(R,0)+1 |
70f29a2b | 395 | |
bbab5c5d JM |
396 | REM set A1 in env to A2 |
397 | K=A1:V=R:GOSUB ENV_SET | |
70f29a2b JM |
398 | GOTO EVAL_RETURN |
399 | ||
400 | EVAL_MACROEXPAND: | |
401 | REM PRINT "macroexpand" | |
cc9dbd92 JM |
402 | R=Z%(A,1)+1:GOSUB DEREF_R |
403 | A=R:GOSUB MACROEXPAND:R=A | |
70f29a2b JM |
404 | |
405 | REM since we are returning it unevaluated, inc the ref cnt | |
bbab5c5d | 406 | Z%(R,0)=Z%(R,0)+32 |
70f29a2b JM |
407 | GOTO EVAL_RETURN |
408 | ||
409 | EVAL_IF: | |
bbab5c5d | 410 | GOSUB EVAL_GET_A1: REM set A1 |
cc9dbd92 | 411 | REM push A |
bbab5c5d JM |
412 | X=X+1:X%(X)=A |
413 | A=A1:GOSUB EVAL | |
cc9dbd92 | 414 | REM pop A |
bbab5c5d | 415 | A=X%(X):X=X-1 |
cc9dbd92 | 416 | IF (R=0) OR (R=1) THEN GOTO EVAL_IF_FALSE |
70f29a2b JM |
417 | |
418 | EVAL_IF_TRUE: | |
cc9dbd92 | 419 | AY=R:GOSUB RELEASE |
bbab5c5d JM |
420 | GOSUB EVAL_GET_A2: REM set A1 and A2 after EVAL |
421 | A=A2:GOTO EVAL_TCO_RECUR: REM TCO loop | |
70f29a2b | 422 | EVAL_IF_FALSE: |
cc9dbd92 | 423 | AY=R:GOSUB RELEASE |
bbab5c5d | 424 | REM if no false case (A3), return nil |
cc9dbd92 | 425 | IF Z%(Z%(Z%(A,1),1),1)=0 THEN R=0:GOTO EVAL_RETURN |
bbab5c5d JM |
426 | GOSUB EVAL_GET_A3: REM set A1 - A3 after EVAL |
427 | A=A3:GOTO EVAL_TCO_RECUR: REM TCO loop | |
70f29a2b JM |
428 | |
429 | EVAL_FN: | |
bbab5c5d JM |
430 | GOSUB EVAL_GET_A2: REM set A1 and A2 |
431 | A=A2:P=A1:GOSUB MAL_FUNCTION | |
70f29a2b JM |
432 | GOTO EVAL_RETURN |
433 | ||
434 | EVAL_INVOKE: | |
435 | REM push EVAL_AST return label/address | |
bbab5c5d | 436 | X=X+1:X%(X)=3 |
70f29a2b JM |
437 | GOTO EVAL_AST |
438 | EVAL_AST_RETURN_3: | |
439 | ||
440 | REM if error, return f/args for release by caller | |
cc9dbd92 | 441 | IF ER<>-2 THEN GOTO EVAL_RETURN |
70f29a2b JM |
442 | |
443 | REM push f/args for release after call | |
bbab5c5d | 444 | X=X+1:X%(X)=R |
70f29a2b | 445 | |
cc9dbd92 | 446 | F=R+1 |
70f29a2b | 447 | |
cc9dbd92 JM |
448 | AR=Z%(R,1): REM rest |
449 | R=F:GOSUB DEREF_R:F=R | |
70f29a2b | 450 | |
bbab5c5d JM |
451 | REM if metadata, get the actual object |
452 | IF (Z%(F,0)AND31)>=16 THEN F=Z%(F,1) | |
453 | ||
454 | IF (Z%(F,0)AND31)=9 THEN GOTO EVAL_DO_FUNCTION | |
455 | IF (Z%(F,0)AND31)=10 THEN GOTO EVAL_DO_MAL_FUNCTION | |
70f29a2b JM |
456 | |
457 | REM if error, pop and return f/args for release by caller | |
bbab5c5d | 458 | R=X%(X):X=X-1 |
cc9dbd92 | 459 | ER=-1:ER$="apply of non-function":GOTO EVAL_RETURN |
70f29a2b JM |
460 | |
461 | EVAL_DO_FUNCTION: | |
01e8850d JM |
462 | REM regular function |
463 | IF Z%(F,1)<60 THEN GOSUB DO_FUNCTION:GOTO DO_TCO_FUNCTION_RETURN_EVAL | |
464 | REM for recur functions (apply, map, swap!), use GOTO | |
465 | IF Z%(F,1)>60 THEN X=X+1:X%(X)=2:GOTO DO_TCO_FUNCTION | |
466 | DO_TCO_FUNCTION_RETURN_EVAL: | |
70f29a2b JM |
467 | |
468 | REM pop and release f/args | |
bbab5c5d | 469 | AY=X%(X):X=X-1:GOSUB RELEASE |
70f29a2b JM |
470 | GOTO EVAL_RETURN |
471 | ||
472 | EVAL_DO_MAL_FUNCTION: | |
bbab5c5d | 473 | E4=E: REM save the current environment for release |
70f29a2b JM |
474 | |
475 | REM create new environ using env stored with function | |
bbab5c5d | 476 | O=Z%(F+1,1):BI=Z%(F+1,0):EX=AR:GOSUB ENV_NEW_BINDS |
70f29a2b JM |
477 | |
478 | REM release previous env if it is not the top one on the | |
bbab5c5d | 479 | REM stack (X%(X-2)) because our new env refers to it and |
70f29a2b | 480 | REM we no longer need to track it (since we are TCO recurring) |
bbab5c5d | 481 | IF E4<>X%(X-2) THEN AY=E4:GOSUB RELEASE |
70f29a2b JM |
482 | |
483 | REM claim the AST before releasing the list containing it | |
bbab5c5d | 484 | A=Z%(F,1):Z%(A,0)=Z%(A,0)+32 |
70f29a2b | 485 | REM add AST to pending release queue to free as soon as EVAL |
cc9dbd92 | 486 | REM actually returns (LV+1) |
bbab5c5d | 487 | Y=Y+1:Y%(Y,0)=A:Y%(Y,1)=LV+1 |
70f29a2b JM |
488 | |
489 | REM pop and release f/args | |
bbab5c5d | 490 | AY=X%(X):X=X-1:GOSUB RELEASE |
70f29a2b | 491 | |
cc9dbd92 JM |
492 | REM A set above |
493 | E=R:GOTO EVAL_TCO_RECUR: REM TCO loop | |
70f29a2b JM |
494 | |
495 | EVAL_RETURN: | |
cc9dbd92 JM |
496 | REM AZ=R: PR=1: GOSUB PR_STR |
497 | REM PRINT "EVAL_RETURN R: ["+R$+"] ("+STR$(R)+"), LV:"+STR$(LV)+",ER:"+STR$(ER) | |
70f29a2b JM |
498 | |
499 | REM release environment if not the top one on the stack | |
bbab5c5d | 500 | IF E<>X%(X-1) THEN AY=E:GOSUB RELEASE |
70f29a2b | 501 | |
cc9dbd92 | 502 | LV=LV-1: REM track basic return stack level |
70f29a2b JM |
503 | |
504 | REM release everything we couldn't release earlier | |
505 | GOSUB RELEASE_PEND | |
506 | ||
507 | REM trigger GC | |
bbab5c5d | 508 | TA=FRE(0) |
70f29a2b | 509 | |
cc9dbd92 | 510 | REM pop A and E off the stack |
bbab5c5d | 511 | E=X%(X-1):A=X%(X):X=X-2 |
70f29a2b JM |
512 | |
513 | RETURN | |
514 | ||
cc9dbd92 | 515 | REM PRINT(A) -> R$ |
70f29a2b | 516 | MAL_PRINT: |
cc9dbd92 | 517 | AZ=A:PR=1:GOSUB PR_STR |
70f29a2b JM |
518 | RETURN |
519 | ||
cc9dbd92 | 520 | REM RE(A$) -> R |
bbab5c5d | 521 | REM Assume D has repl_env |
70f29a2b JM |
522 | REM caller must release result |
523 | RE: | |
cc9dbd92 | 524 | R1=0 |
70f29a2b | 525 | GOSUB MAL_READ |
cc9dbd92 | 526 | R1=R |
0e508fa5 | 527 | IF ER<>-2 THEN GOTO RE_DONE |
70f29a2b | 528 | |
bbab5c5d | 529 | A=R:E=D:GOSUB EVAL |
70f29a2b | 530 | |
0e508fa5 | 531 | RE_DONE: |
70f29a2b | 532 | REM Release memory from MAL_READ |
cc9dbd92 | 533 | IF R1<>0 THEN AY=R1:GOSUB RELEASE |
70f29a2b JM |
534 | RETURN: REM caller must release result of EVAL |
535 | ||
536 | REM REP(A$) -> R$ | |
bbab5c5d | 537 | REM Assume D has repl_env |
70f29a2b | 538 | REP: |
cc9dbd92 | 539 | R1=0:R2=0 |
70f29a2b | 540 | GOSUB MAL_READ |
cc9dbd92 JM |
541 | R1=R |
542 | IF ER<>-2 THEN GOTO REP_DONE | |
70f29a2b | 543 | |
bbab5c5d | 544 | A=R:E=D:GOSUB EVAL |
cc9dbd92 JM |
545 | R2=R |
546 | IF ER<>-2 THEN GOTO REP_DONE | |
70f29a2b | 547 | |
cc9dbd92 | 548 | A=R:GOSUB MAL_PRINT |
70f29a2b JM |
549 | RT$=R$ |
550 | ||
551 | REP_DONE: | |
552 | REM Release memory from MAL_READ and EVAL | |
cc9dbd92 JM |
553 | IF R2<>0 THEN AY=R2:GOSUB RELEASE |
554 | IF R1<>0 THEN AY=R1:GOSUB RELEASE | |
70f29a2b | 555 | R$=RT$ |
01e8850d | 556 | GOTO REP_RETURN |
70f29a2b JM |
557 | |
558 | REM MAIN program | |
559 | MAIN: | |
560 | GOSUB INIT_MEMORY | |
561 | ||
cc9dbd92 | 562 | LV=0 |
70f29a2b JM |
563 | |
564 | REM create repl_env | |
bbab5c5d | 565 | O=-1:GOSUB ENV_NEW:D=R |
70f29a2b JM |
566 | |
567 | REM core.EXT: defined in Basic | |
bbab5c5d | 568 | E=D:GOSUB INIT_CORE_NS: REM set core functions in repl_env |
70f29a2b | 569 | |
bbab5c5d | 570 | ZT=ZI: REM top of memory after base repl_env |
70f29a2b JM |
571 | |
572 | REM core.mal: defined using the language itself | |
573 | A$="(def! not (fn* (a) (if a false true)))" | |
cc9dbd92 | 574 | GOSUB RE:AY=R:GOSUB RELEASE |
70f29a2b | 575 | |
0e508fa5 | 576 | A$="(def! load-file (fn* (f) (eval (read-file f))))" |
cc9dbd92 | 577 | GOSUB RE:AY=R:GOSUB RELEASE |
70f29a2b JM |
578 | |
579 | A$="(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs)" | |
580 | A$=A$+" (if (> (count xs) 1) (nth xs 1) (throw "+CHR$(34)+"odd number of" | |
581 | A$=A$+" forms to cond"+CHR$(34)+")) (cons 'cond (rest (rest xs)))))))" | |
cc9dbd92 | 582 | GOSUB RE:AY=R:GOSUB RELEASE |
70f29a2b JM |
583 | |
584 | A$="(defmacro! or (fn* (& xs) (if (empty? xs) nil (if (= 1 (count xs)) (first xs)" | |
585 | A$=A$+" `(let* (or_FIXME ~(first xs)) (if or_FIXME or_FIXME (or ~@(rest xs))))))))" | |
cc9dbd92 | 586 | GOSUB RE:AY=R:GOSUB RELEASE |
70f29a2b JM |
587 | |
588 | REM load the args file | |
589 | A$="(def! -*ARGS*- (load-file "+CHR$(34)+".args.mal"+CHR$(34)+"))" | |
cc9dbd92 | 590 | GOSUB RE:AY=R:GOSUB RELEASE |
70f29a2b JM |
591 | |
592 | REM set the argument list | |
593 | A$="(def! *ARGV* (rest -*ARGS*-))" | |
cc9dbd92 | 594 | GOSUB RE:AY=R:GOSUB RELEASE |
70f29a2b JM |
595 | |
596 | REM get the first argument | |
597 | A$="(first -*ARGS*-)" | |
598 | GOSUB RE | |
599 | ||
600 | REM if there is an argument, then run it as a program | |
cc9dbd92 | 601 | IF R<>0 THEN AY=R:GOSUB RELEASE:GOTO RUN_PROG |
70f29a2b | 602 | REM no arguments, start REPL loop |
cc9dbd92 | 603 | IF R=0 THEN GOTO REPL_LOOP |
70f29a2b JM |
604 | |
605 | RUN_PROG: | |
606 | REM run a single mal program and exit | |
607 | A$="(load-file (first -*ARGS*-))" | |
608 | GOSUB RE | |
cc9dbd92 | 609 | IF ER<>-2 THEN GOSUB PRINT_ERROR |
01e8850d | 610 | GOTO QUIT |
70f29a2b JM |
611 | |
612 | REPL_LOOP: | |
613 | A$="user> ":GOSUB READLINE: REM call input parser | |
614 | IF EOF=1 THEN GOTO QUIT | |
615 | ||
01e8850d JM |
616 | A$=R$:GOTO REP: REM call REP |
617 | REP_RETURN: | |
70f29a2b | 618 | |
cc9dbd92 | 619 | IF ER<>-2 THEN GOSUB PRINT_ERROR:GOTO REPL_LOOP |
70f29a2b JM |
620 | PRINT R$ |
621 | GOTO REPL_LOOP | |
622 | ||
623 | QUIT: | |
bbab5c5d | 624 | REM P1=ZT: P2=-1: GOSUB PR_MEMORY |
70f29a2b JM |
625 | GOSUB PR_MEMORY_SUMMARY |
626 | END | |
627 | ||
628 | PRINT_ERROR: | |
629 | PRINT "Error: "+ER$ | |
cc9dbd92 | 630 | ER=-2:ER$="" |
70f29a2b JM |
631 | RETURN |
632 |