Commit | Line | Data |
---|---|---|
9e8f5211 JM |
1 | GOTO MAIN |
2 | ||
3 | REM $INCLUDE: 'readline.in.bas' | |
4 | REM $INCLUDE: 'types.in.bas' | |
5 | REM $INCLUDE: 'reader.in.bas' | |
6 | REM $INCLUDE: 'printer.in.bas' | |
7 | REM $INCLUDE: 'env.in.bas' | |
8 | REM $INCLUDE: 'core.in.bas' | |
9 | ||
10 | REM $INCLUDE: 'debug.in.bas' | |
11 | ||
cc9dbd92 | 12 | REM READ(A$) -> R |
9e8f5211 JM |
13 | MAL_READ: |
14 | GOSUB READ_STR | |
15 | RETURN | |
16 | ||
cc9dbd92 | 17 | REM PAIR_Q(B) -> R |
9e8f5211 | 18 | PAIR_Q: |
cc9dbd92 | 19 | R=0 |
bbab5c5d | 20 | IF (Z%(B,0)AND31)<>6 AND (Z%(B,0)AND31)<>7 THEN RETURN |
cc9dbd92 JM |
21 | IF (Z%(B,1)=0) THEN RETURN |
22 | R=1 | |
9e8f5211 JM |
23 | RETURN |
24 | ||
cc9dbd92 | 25 | REM QUASIQUOTE(A) -> R |
9e8f5211 | 26 | QUASIQUOTE: |
cc9dbd92 JM |
27 | B=A:GOSUB PAIR_Q |
28 | IF R=1 THEN GOTO QQ_UNQUOTE | |
9e8f5211 | 29 | REM ['quote, ast] |
cc9dbd92 | 30 | AS$="quote":T=5:GOSUB STRING |
bbab5c5d JM |
31 | B2=R:B1=A:GOSUB LIST2 |
32 | AY=B2:GOSUB RELEASE | |
9e8f5211 JM |
33 | |
34 | RETURN | |
35 | ||
36 | QQ_UNQUOTE: | |
cc9dbd92 | 37 | R=A+1:GOSUB DEREF_R |
bbab5c5d | 38 | IF (Z%(R,0)AND31)<>5 THEN GOTO QQ_SPLICE_UNQUOTE |
cc9dbd92 | 39 | IF S$(Z%(R,1))<>"unquote" THEN GOTO QQ_SPLICE_UNQUOTE |
9e8f5211 | 40 | REM [ast[1]] |
cc9dbd92 | 41 | R=Z%(A,1)+1:GOSUB DEREF_R |
bbab5c5d | 42 | Z%(R,0)=Z%(R,0)+32 |
9e8f5211 JM |
43 | |
44 | RETURN | |
45 | ||
46 | QQ_SPLICE_UNQUOTE: | |
cc9dbd92 | 47 | REM push A on the stack |
bbab5c5d | 48 | X=X+1:X%(X)=A |
9e8f5211 | 49 | REM rest of cases call quasiquote on ast[1..] |
cc9dbd92 JM |
50 | A=Z%(A,1):GOSUB QUASIQUOTE:T6=R |
51 | REM pop A off the stack | |
bbab5c5d | 52 | A=X%(X):X=X-1 |
cc9dbd92 JM |
53 | |
54 | REM set A to ast[0] for last two cases | |
55 | A=A+1:GOSUB DEREF_A | |
56 | ||
57 | B=A:GOSUB PAIR_Q | |
58 | IF R=0 THEN GOTO QQ_DEFAULT | |
59 | B=A+1:GOSUB DEREF_B | |
bbab5c5d | 60 | IF (Z%(B,0)AND31)<>5 THEN GOTO QQ_DEFAULT |
cc9dbd92 | 61 | IF S$(Z%(B,1))<>"splice-unquote" THEN QQ_DEFAULT |
9e8f5211 JM |
62 | REM ['concat, ast[0][1], quasiquote(ast[1..])] |
63 | ||
bbab5c5d JM |
64 | B=Z%(A,1)+1:GOSUB DEREF_B:B2=B |
65 | AS$="concat":T=5:GOSUB STRING:B3=R | |
66 | B1=T6:GOSUB LIST3 | |
9e8f5211 | 67 | REM release inner quasiquoted since outer list takes ownership |
bbab5c5d JM |
68 | AY=B1:GOSUB RELEASE |
69 | AY=B3:GOSUB RELEASE | |
9e8f5211 JM |
70 | RETURN |
71 | ||
72 | QQ_DEFAULT: | |
73 | REM ['cons, quasiquote(ast[0]), quasiquote(ast[1..])] | |
74 | ||
cc9dbd92 | 75 | REM push T6 on the stack |
bbab5c5d | 76 | X=X+1:X%(X)=T6 |
cc9dbd92 | 77 | REM A set above to ast[0] |
bbab5c5d | 78 | GOSUB QUASIQUOTE:B2=R |
cc9dbd92 | 79 | REM pop T6 off the stack |
bbab5c5d | 80 | T6=X%(X):X=X-1 |
9e8f5211 | 81 | |
bbab5c5d JM |
82 | AS$="cons":T=5:GOSUB STRING:B3=R |
83 | B1=T6:GOSUB LIST3 | |
9e8f5211 | 84 | REM release inner quasiquoted since outer list takes ownership |
bbab5c5d JM |
85 | AY=B1:GOSUB RELEASE |
86 | AY=B2:GOSUB RELEASE | |
87 | AY=B3:GOSUB RELEASE | |
9e8f5211 JM |
88 | RETURN |
89 | ||
90 | ||
cc9dbd92 | 91 | REM EVAL_AST(A, E) -> R |
9e8f5211 JM |
92 | REM called using GOTO to avoid basic return address stack usage |
93 | REM top of stack should have return label index | |
94 | EVAL_AST: | |
cc9dbd92 | 95 | REM push A and E on the stack |
bbab5c5d | 96 | X=X+2:X%(X-1)=E:X%(X)=A |
9e8f5211 | 97 | |
cc9dbd92 | 98 | IF ER<>-2 THEN GOTO EVAL_AST_RETURN |
9e8f5211 JM |
99 | |
100 | GOSUB DEREF_A | |
101 | ||
bbab5c5d | 102 | T=Z%(A,0)AND31 |
cc9dbd92 JM |
103 | IF T=5 THEN GOTO EVAL_AST_SYMBOL |
104 | IF T>=6 AND T<=8 THEN GOTO EVAL_AST_SEQ | |
9e8f5211 JM |
105 | |
106 | REM scalar: deref to actual value and inc ref cnt | |
cc9dbd92 | 107 | R=A:GOSUB DEREF_R |
bbab5c5d | 108 | Z%(R,0)=Z%(R,0)+32 |
9e8f5211 JM |
109 | GOTO EVAL_AST_RETURN |
110 | ||
111 | EVAL_AST_SYMBOL: | |
cc9dbd92 | 112 | K=A:GOSUB ENV_GET |
9e8f5211 JM |
113 | GOTO EVAL_AST_RETURN |
114 | ||
115 | EVAL_AST_SEQ: | |
a742287e JM |
116 | REM allocate the first entry (T already set above) |
117 | L=0:N=0:GOSUB ALLOC | |
9e8f5211 JM |
118 | |
119 | REM make space on the stack | |
cc9dbd92 | 120 | X=X+4 |
9e8f5211 | 121 | REM push type of sequence |
bbab5c5d | 122 | X%(X-3)=T |
9e8f5211 | 123 | REM push sequence index |
bbab5c5d | 124 | X%(X-2)=-1 |
9e8f5211 | 125 | REM push future return value (new sequence) |
bbab5c5d | 126 | X%(X-1)=R |
9e8f5211 | 127 | REM push previous new sequence entry |
bbab5c5d | 128 | X%(X)=R |
9e8f5211 JM |
129 | |
130 | EVAL_AST_SEQ_LOOP: | |
9e8f5211 | 131 | REM update index |
bbab5c5d | 132 | X%(X-2)=X%(X-2)+1 |
9e8f5211 JM |
133 | |
134 | REM check if we are done evaluating the source sequence | |
cc9dbd92 | 135 | IF Z%(A,1)=0 THEN GOTO EVAL_AST_SEQ_LOOP_DONE |
9e8f5211 JM |
136 | |
137 | REM if hashmap, skip eval of even entries (keys) | |
bbab5c5d | 138 | IF (X%(X-3)=8) AND ((X%(X-2) AND 1)=0) THEN GOTO EVAL_AST_DO_REF |
9e8f5211 JM |
139 | GOTO EVAL_AST_DO_EVAL |
140 | ||
141 | EVAL_AST_DO_REF: | |
cc9dbd92 | 142 | R=A+1:GOSUB DEREF_R: REM deref to target of referred entry |
bbab5c5d | 143 | Z%(R,0)=Z%(R,0)+32: REM inc ref cnt of referred value |
9e8f5211 JM |
144 | GOTO EVAL_AST_ADD_VALUE |
145 | ||
146 | EVAL_AST_DO_EVAL: | |
147 | REM call EVAL for each entry | |
cc9dbd92 JM |
148 | A=A+1:GOSUB EVAL |
149 | A=A-1 | |
9e8f5211 JM |
150 | GOSUB DEREF_R: REM deref to target of evaluated entry |
151 | ||
152 | EVAL_AST_ADD_VALUE: | |
153 | ||
154 | REM update previous value pointer to evaluated entry | |
bbab5c5d | 155 | Z%(X%(X)+1,1)=R |
9e8f5211 | 156 | |
cc9dbd92 | 157 | IF ER<>-2 THEN GOTO EVAL_AST_SEQ_LOOP_DONE |
9e8f5211 JM |
158 | |
159 | REM allocate the next entry | |
a742287e | 160 | REM same new sequence entry type |
bbab5c5d | 161 | T=X%(X-3):L=0:N=0:GOSUB ALLOC |
9e8f5211 JM |
162 | |
163 | REM update previous sequence entry value to point to new entry | |
bbab5c5d | 164 | Z%(X%(X),1)=R |
9e8f5211 | 165 | REM update previous ptr to current entry |
bbab5c5d | 166 | X%(X)=R |
9e8f5211 JM |
167 | |
168 | REM process the next sequence entry from source list | |
cc9dbd92 | 169 | A=Z%(A,1) |
9e8f5211 JM |
170 | |
171 | GOTO EVAL_AST_SEQ_LOOP | |
172 | EVAL_AST_SEQ_LOOP_DONE: | |
173 | REM if no error, get return value (new seq) | |
bbab5c5d | 174 | IF ER=-2 THEN R=X%(X-1) |
9e8f5211 | 175 | REM otherwise, free the return value and return nil |
bbab5c5d | 176 | IF ER<>-2 THEN R=0:AY=X%(X-1):GOSUB RELEASE |
9e8f5211 JM |
177 | |
178 | REM pop previous, return, index and type | |
cc9dbd92 | 179 | X=X-4 |
9e8f5211 JM |
180 | GOTO EVAL_AST_RETURN |
181 | ||
182 | EVAL_AST_RETURN: | |
cc9dbd92 | 183 | REM pop A and E off the stack |
bbab5c5d | 184 | E=X%(X-1):A=X%(X):X=X-2 |
9e8f5211 JM |
185 | |
186 | REM pop EVAL AST return label/address | |
bbab5c5d JM |
187 | RN=X%(X):X=X-1 |
188 | ON RN GOTO EVAL_AST_RETURN_1,EVAL_AST_RETURN_2,EVAL_AST_RETURN_3 | |
9e8f5211 JM |
189 | RETURN |
190 | ||
cc9dbd92 | 191 | REM EVAL(A, E)) -> R |
9e8f5211 | 192 | EVAL: |
cc9dbd92 | 193 | LV=LV+1: REM track basic return stack level |
9e8f5211 | 194 | |
cc9dbd92 | 195 | REM push A and E on the stack |
bbab5c5d | 196 | X=X+2:X%(X-1)=E:X%(X)=A |
9e8f5211 JM |
197 | |
198 | EVAL_TCO_RECUR: | |
199 | ||
cc9dbd92 JM |
200 | REM AZ=A:PR=1:GOSUB PR_STR |
201 | REM PRINT "EVAL: "+R$+" [A:"+STR$(A)+", LV:"+STR$(LV)+"]" | |
9e8f5211 JM |
202 | |
203 | GOSUB DEREF_A | |
204 | ||
205 | GOSUB LIST_Q | |
cc9dbd92 | 206 | IF R THEN GOTO APPLY_LIST |
9e8f5211 JM |
207 | REM ELSE |
208 | REM push EVAL_AST return label/address | |
bbab5c5d | 209 | X=X+1:X%(X)=1 |
9e8f5211 JM |
210 | GOTO EVAL_AST |
211 | EVAL_AST_RETURN_1: | |
212 | ||
213 | GOTO EVAL_RETURN | |
214 | ||
215 | APPLY_LIST: | |
216 | GOSUB EMPTY_Q | |
bbab5c5d | 217 | IF R THEN R=A:Z%(R,0)=Z%(R,0)+32:GOTO EVAL_RETURN |
9e8f5211 | 218 | |
bbab5c5d JM |
219 | A0=A+1 |
220 | R=A0:GOSUB DEREF_R:A0=R | |
9e8f5211 JM |
221 | |
222 | REM get symbol in A$ | |
bbab5c5d JM |
223 | IF (Z%(A0,0)AND31)<>5 THEN A$="" |
224 | IF (Z%(A0,0)AND31)=5 THEN A$=S$(Z%(A0,1)) | |
9e8f5211 JM |
225 | |
226 | IF A$="def!" THEN GOTO EVAL_DEF | |
227 | IF A$="let*" THEN GOTO EVAL_LET | |
228 | IF A$="quote" THEN GOTO EVAL_QUOTE | |
229 | IF A$="quasiquote" THEN GOTO EVAL_QUASIQUOTE | |
230 | IF A$="do" THEN GOTO EVAL_DO | |
231 | IF A$="if" THEN GOTO EVAL_IF | |
232 | IF A$="fn*" THEN GOTO EVAL_FN | |
233 | GOTO EVAL_INVOKE | |
234 | ||
235 | EVAL_GET_A3: | |
bbab5c5d JM |
236 | A3=Z%(Z%(Z%(A,1),1),1)+1 |
237 | R=A3:GOSUB DEREF_R:A3=R | |
9e8f5211 | 238 | EVAL_GET_A2: |
bbab5c5d JM |
239 | A2=Z%(Z%(A,1),1)+1 |
240 | R=A2:GOSUB DEREF_R:A2=R | |
9e8f5211 | 241 | EVAL_GET_A1: |
bbab5c5d JM |
242 | A1=Z%(A,1)+1 |
243 | R=A1:GOSUB DEREF_R:A1=R | |
9e8f5211 JM |
244 | RETURN |
245 | ||
246 | EVAL_DEF: | |
247 | REM PRINT "def!" | |
bbab5c5d | 248 | GOSUB EVAL_GET_A2: REM set A1 and A2 |
9e8f5211 | 249 | |
bbab5c5d JM |
250 | X=X+1:X%(X)=A1: REM push A1 |
251 | A=A2:GOSUB EVAL: REM eval a2 | |
252 | A1=X%(X):X=X-1: REM pop A1 | |
9e8f5211 | 253 | |
cc9dbd92 | 254 | IF ER<>-2 THEN GOTO EVAL_RETURN |
70f29a2b | 255 | |
9e8f5211 | 256 | REM set a1 in env to a2 |
bbab5c5d | 257 | K=A1:V=R:GOSUB ENV_SET |
9e8f5211 JM |
258 | GOTO EVAL_RETURN |
259 | ||
260 | EVAL_LET: | |
261 | REM PRINT "let*" | |
bbab5c5d | 262 | GOSUB EVAL_GET_A2: REM set A1 and A2 |
9e8f5211 | 263 | |
bbab5c5d JM |
264 | X=X+1:X%(X)=A2: REM push/save A2 |
265 | X=X+1:X%(X)=E: REM push env for for later release | |
9e8f5211 JM |
266 | |
267 | REM create new environment with outer as current environment | |
cc9dbd92 JM |
268 | O=E:GOSUB ENV_NEW |
269 | E=R | |
9e8f5211 | 270 | EVAL_LET_LOOP: |
bbab5c5d | 271 | IF Z%(A1,1)=0 THEN GOTO EVAL_LET_LOOP_DONE |
9e8f5211 | 272 | |
bbab5c5d | 273 | X=X+1:X%(X)=A1: REM push A1 |
9e8f5211 | 274 | REM eval current A1 odd element |
bbab5c5d JM |
275 | A=Z%(A1,1)+1:GOSUB EVAL |
276 | A1=X%(X):X=X-1: REM pop A1 | |
9e8f5211 | 277 | |
bbab5c5d JM |
278 | REM set environment: even A1 key to odd A1 eval'd above |
279 | K=A1+1:V=R:GOSUB ENV_SET | |
cc9dbd92 | 280 | AY=R:GOSUB RELEASE: REM release our use, ENV_SET took ownership |
9e8f5211 | 281 | |
bbab5c5d JM |
282 | REM skip to the next pair of A1 elements |
283 | A1=Z%(Z%(A1,1),1) | |
9e8f5211 | 284 | GOTO EVAL_LET_LOOP |
70f29a2b | 285 | |
9e8f5211 | 286 | EVAL_LET_LOOP_DONE: |
bbab5c5d | 287 | E4=X%(X):X=X-1: REM pop previous env |
70f29a2b JM |
288 | |
289 | REM release previous environment if not the current EVAL env | |
bbab5c5d | 290 | IF E4<>X%(X-2) THEN AY=E4:GOSUB RELEASE |
9e8f5211 | 291 | |
bbab5c5d JM |
292 | A2=X%(X):X=X-1: REM pop A2 |
293 | A=A2:GOTO EVAL_TCO_RECUR: REM TCO loop | |
9e8f5211 JM |
294 | |
295 | EVAL_DO: | |
cc9dbd92 | 296 | A=Z%(A,1): REM rest |
9e8f5211 JM |
297 | |
298 | REM TODO: TCO | |
299 | ||
300 | REM push EVAL_AST return label/address | |
bbab5c5d | 301 | X=X+1:X%(X)=2 |
9e8f5211 JM |
302 | GOTO EVAL_AST |
303 | EVAL_AST_RETURN_2: | |
304 | ||
bbab5c5d | 305 | X=X+1:X%(X)=R: REM push eval'd list |
cc9dbd92 | 306 | A=R:GOSUB LAST: REM return the last element |
bbab5c5d | 307 | AY=X%(X):X=X-1: REM pop eval'd list |
9e8f5211 JM |
308 | GOSUB RELEASE: REM release the eval'd list |
309 | GOTO EVAL_RETURN | |
310 | ||
311 | EVAL_QUOTE: | |
cc9dbd92 | 312 | R=Z%(A,1)+1:GOSUB DEREF_R |
bbab5c5d | 313 | Z%(R,0)=Z%(R,0)+32 |
9e8f5211 JM |
314 | GOTO EVAL_RETURN |
315 | ||
316 | EVAL_QUASIQUOTE: | |
cc9dbd92 JM |
317 | R=Z%(A,1)+1:GOSUB DEREF_R |
318 | A=R:GOSUB QUASIQUOTE | |
9e8f5211 | 319 | REM add quasiquote result to pending release queue to free when |
cc9dbd92 | 320 | REM next lower EVAL level returns (LV) |
bbab5c5d | 321 | Y=Y+1:Y%(Y,0)=R:Y%(Y,1)=LV |
9e8f5211 | 322 | |
cc9dbd92 | 323 | A=R:GOTO EVAL_TCO_RECUR: REM TCO loop |
9e8f5211 JM |
324 | |
325 | EVAL_IF: | |
bbab5c5d | 326 | GOSUB EVAL_GET_A1: REM set A1 |
cc9dbd92 | 327 | REM push A |
bbab5c5d JM |
328 | X=X+1:X%(X)=A |
329 | A=A1:GOSUB EVAL | |
cc9dbd92 | 330 | REM pop A |
bbab5c5d | 331 | A=X%(X):X=X-1 |
cc9dbd92 | 332 | IF (R=0) OR (R=1) THEN GOTO EVAL_IF_FALSE |
9e8f5211 JM |
333 | |
334 | EVAL_IF_TRUE: | |
cc9dbd92 | 335 | AY=R:GOSUB RELEASE |
bbab5c5d JM |
336 | GOSUB EVAL_GET_A2: REM set A1 and A2 after EVAL |
337 | A=A2:GOTO EVAL_TCO_RECUR: REM TCO loop | |
9e8f5211 | 338 | EVAL_IF_FALSE: |
cc9dbd92 | 339 | AY=R:GOSUB RELEASE |
bbab5c5d | 340 | REM if no false case (A3), return nil |
cc9dbd92 | 341 | IF Z%(Z%(Z%(A,1),1),1)=0 THEN R=0:GOTO EVAL_RETURN |
bbab5c5d JM |
342 | GOSUB EVAL_GET_A3: REM set A1 - A3 after EVAL |
343 | A=A3:GOTO EVAL_TCO_RECUR: REM TCO loop | |
9e8f5211 JM |
344 | |
345 | EVAL_FN: | |
bbab5c5d JM |
346 | GOSUB EVAL_GET_A2: REM set A1 and A2 |
347 | A=A2:P=A1:GOSUB MAL_FUNCTION | |
9e8f5211 JM |
348 | GOTO EVAL_RETURN |
349 | ||
350 | EVAL_INVOKE: | |
351 | REM push EVAL_AST return label/address | |
bbab5c5d | 352 | X=X+1:X%(X)=3 |
9e8f5211 JM |
353 | GOTO EVAL_AST |
354 | EVAL_AST_RETURN_3: | |
355 | ||
356 | REM if error, return f/args for release by caller | |
cc9dbd92 | 357 | IF ER<>-2 THEN GOTO EVAL_RETURN |
9e8f5211 JM |
358 | |
359 | REM push f/args for release after call | |
bbab5c5d | 360 | X=X+1:X%(X)=R |
9e8f5211 | 361 | |
cc9dbd92 | 362 | F=R+1 |
9e8f5211 | 363 | |
cc9dbd92 JM |
364 | AR=Z%(R,1): REM rest |
365 | R=F:GOSUB DEREF_R:F=R | |
9e8f5211 | 366 | |
bbab5c5d JM |
367 | REM if metadata, get the actual object |
368 | IF (Z%(F,0)AND31)>=16 THEN F=Z%(F,1) | |
369 | ||
370 | IF (Z%(F,0)AND31)=9 THEN GOTO EVAL_DO_FUNCTION | |
371 | IF (Z%(F,0)AND31)=10 THEN GOTO EVAL_DO_MAL_FUNCTION | |
9e8f5211 JM |
372 | |
373 | REM if error, pop and return f/args for release by caller | |
bbab5c5d | 374 | R=X%(X):X=X-1 |
cc9dbd92 | 375 | ER=-1:ER$="apply of non-function":GOTO EVAL_RETURN |
9e8f5211 JM |
376 | |
377 | EVAL_DO_FUNCTION: | |
378 | GOSUB DO_FUNCTION | |
379 | ||
380 | REM pop and release f/args | |
bbab5c5d | 381 | AY=X%(X):X=X-1:GOSUB RELEASE |
9e8f5211 JM |
382 | GOTO EVAL_RETURN |
383 | ||
384 | EVAL_DO_MAL_FUNCTION: | |
bbab5c5d | 385 | E4=E: REM save the current environment for release |
9e8f5211 JM |
386 | |
387 | REM create new environ using env stored with function | |
bbab5c5d | 388 | O=Z%(F+1,1):BI=Z%(F+1,0):EX=AR:GOSUB ENV_NEW_BINDS |
9e8f5211 JM |
389 | |
390 | REM release previous env if it is not the top one on the | |
bbab5c5d | 391 | REM stack (X%(X-2)) because our new env refers to it and |
9e8f5211 | 392 | REM we no longer need to track it (since we are TCO recurring) |
bbab5c5d | 393 | IF E4<>X%(X-2) THEN AY=E4:GOSUB RELEASE |
9e8f5211 JM |
394 | |
395 | REM claim the AST before releasing the list containing it | |
bbab5c5d | 396 | A=Z%(F,1):Z%(A,0)=Z%(A,0)+32 |
9e8f5211 | 397 | REM add AST to pending release queue to free as soon as EVAL |
cc9dbd92 | 398 | REM actually returns (LV+1) |
bbab5c5d | 399 | Y=Y+1:Y%(Y,0)=A:Y%(Y,1)=LV+1 |
9e8f5211 JM |
400 | |
401 | REM pop and release f/args | |
bbab5c5d | 402 | AY=X%(X):X=X-1:GOSUB RELEASE |
9e8f5211 | 403 | |
cc9dbd92 JM |
404 | REM A set above |
405 | E=R:GOTO EVAL_TCO_RECUR: REM TCO loop | |
9e8f5211 JM |
406 | |
407 | EVAL_RETURN: | |
cc9dbd92 JM |
408 | REM AZ=R: PR=1: GOSUB PR_STR |
409 | REM PRINT "EVAL_RETURN R: ["+R$+"] ("+STR$(R)+"), LV:"+STR$(LV)+",ER:"+STR$(ER) | |
9e8f5211 JM |
410 | |
411 | REM release environment if not the top one on the stack | |
bbab5c5d | 412 | IF E<>X%(X-1) THEN AY=E:GOSUB RELEASE |
9e8f5211 | 413 | |
cc9dbd92 | 414 | LV=LV-1: REM track basic return stack level |
9e8f5211 JM |
415 | |
416 | REM release everything we couldn't release earlier | |
417 | GOSUB RELEASE_PEND | |
418 | ||
419 | REM trigger GC | |
bbab5c5d | 420 | TA=FRE(0) |
9e8f5211 | 421 | |
cc9dbd92 | 422 | REM pop A and E off the stack |
bbab5c5d | 423 | E=X%(X-1):A=X%(X):X=X-2 |
9e8f5211 JM |
424 | |
425 | RETURN | |
426 | ||
cc9dbd92 | 427 | REM PRINT(A) -> R$ |
9e8f5211 | 428 | MAL_PRINT: |
cc9dbd92 | 429 | AZ=A:PR=1:GOSUB PR_STR |
9e8f5211 JM |
430 | RETURN |
431 | ||
cc9dbd92 | 432 | REM RE(A$) -> R |
bbab5c5d | 433 | REM Assume D has repl_env |
9e8f5211 JM |
434 | REM caller must release result |
435 | RE: | |
cc9dbd92 | 436 | R1=0 |
9e8f5211 | 437 | GOSUB MAL_READ |
cc9dbd92 JM |
438 | R1=R |
439 | IF ER<>-2 THEN GOTO REP_DONE | |
9e8f5211 | 440 | |
bbab5c5d | 441 | A=R:E=D:GOSUB EVAL |
9e8f5211 JM |
442 | |
443 | REP_DONE: | |
444 | REM Release memory from MAL_READ | |
cc9dbd92 | 445 | IF R1<>0 THEN AY=R1:GOSUB RELEASE |
9e8f5211 JM |
446 | RETURN: REM caller must release result of EVAL |
447 | ||
448 | REM REP(A$) -> R$ | |
bbab5c5d | 449 | REM Assume D has repl_env |
9e8f5211 | 450 | REP: |
cc9dbd92 | 451 | R1=0:R2=0 |
9e8f5211 | 452 | GOSUB MAL_READ |
cc9dbd92 JM |
453 | R1=R |
454 | IF ER<>-2 THEN GOTO REP_DONE | |
9e8f5211 | 455 | |
bbab5c5d | 456 | A=R:E=D:GOSUB EVAL |
cc9dbd92 JM |
457 | R2=R |
458 | IF ER<>-2 THEN GOTO REP_DONE | |
9e8f5211 | 459 | |
cc9dbd92 | 460 | A=R:GOSUB MAL_PRINT |
9e8f5211 JM |
461 | RT$=R$ |
462 | ||
463 | REP_DONE: | |
464 | REM Release memory from MAL_READ and EVAL | |
cc9dbd92 JM |
465 | IF R2<>0 THEN AY=R2:GOSUB RELEASE |
466 | IF R1<>0 THEN AY=R1:GOSUB RELEASE | |
9e8f5211 JM |
467 | R$=RT$ |
468 | RETURN | |
469 | ||
470 | REM MAIN program | |
471 | MAIN: | |
472 | GOSUB INIT_MEMORY | |
473 | ||
cc9dbd92 | 474 | LV=0 |
9e8f5211 JM |
475 | |
476 | REM create repl_env | |
bbab5c5d | 477 | O=-1:GOSUB ENV_NEW:D=R |
9e8f5211 JM |
478 | |
479 | REM core.EXT: defined in Basic | |
bbab5c5d | 480 | E=D:GOSUB INIT_CORE_NS: REM set core functions in repl_env |
9e8f5211 | 481 | |
bbab5c5d | 482 | ZT=ZI: REM top of memory after base repl_env |
9e8f5211 JM |
483 | |
484 | REM core.mal: defined using the language itself | |
60ef223c | 485 | A$="(def! not (fn* (a) (if a false true)))" |
cc9dbd92 | 486 | GOSUB RE:AY=R:GOSUB RELEASE |
9e8f5211 JM |
487 | |
488 | A$="(def! load-file (fn* (f) (eval (read-string (str " | |
60ef223c | 489 | A$=A$+CHR$(34)+"(do "+CHR$(34)+" (slurp f) "+CHR$(34)+")"+CHR$(34)+")))))" |
cc9dbd92 | 490 | GOSUB RE:AY=R:GOSUB RELEASE |
9e8f5211 JM |
491 | |
492 | REM load the args file | |
493 | A$="(def! -*ARGS*- (load-file "+CHR$(34)+".args.mal"+CHR$(34)+"))" | |
cc9dbd92 | 494 | GOSUB RE:AY=R:GOSUB RELEASE |
9e8f5211 JM |
495 | |
496 | REM set the argument list | |
60ef223c | 497 | A$="(def! *ARGV* (rest -*ARGS*-))" |
cc9dbd92 | 498 | GOSUB RE:AY=R:GOSUB RELEASE |
9e8f5211 JM |
499 | |
500 | REM get the first argument | |
60ef223c JM |
501 | A$="(first -*ARGS*-)" |
502 | GOSUB RE | |
9e8f5211 JM |
503 | |
504 | REM if there is an argument, then run it as a program | |
cc9dbd92 | 505 | IF R<>0 THEN AY=R:GOSUB RELEASE:GOTO RUN_PROG |
9e8f5211 | 506 | REM no arguments, start REPL loop |
cc9dbd92 | 507 | IF R=0 THEN GOTO REPL_LOOP |
9e8f5211 JM |
508 | |
509 | RUN_PROG: | |
510 | REM run a single mal program and exit | |
60ef223c JM |
511 | A$="(load-file (first -*ARGS*-))" |
512 | GOSUB RE | |
cc9dbd92 | 513 | IF ER<>-2 THEN GOSUB PRINT_ERROR |
9e8f5211 JM |
514 | END |
515 | ||
516 | REPL_LOOP: | |
60ef223c | 517 | A$="user> ":GOSUB READLINE: REM call input parser |
9e8f5211 JM |
518 | IF EOF=1 THEN GOTO QUIT |
519 | ||
60ef223c | 520 | A$=R$:GOSUB REP: REM call REP |
9e8f5211 | 521 | |
cc9dbd92 | 522 | IF ER<>-2 THEN GOSUB PRINT_ERROR:GOTO REPL_LOOP |
9e8f5211 JM |
523 | PRINT R$ |
524 | GOTO REPL_LOOP | |
525 | ||
526 | QUIT: | |
bbab5c5d | 527 | REM P1=ZT: P2=-1: GOSUB PR_MEMORY |
9e8f5211 JM |
528 | GOSUB PR_MEMORY_SUMMARY |
529 | END | |
530 | ||
531 | PRINT_ERROR: | |
532 | PRINT "Error: "+ER$ | |
cc9dbd92 | 533 | ER=-2:ER$="" |
9e8f5211 JM |
534 | RETURN |
535 |