59 |
hashtbl symbols; /* Hash table of all variable bindings */ |
hashtbl symbols; /* Hash table of all variable bindings */ |
60 |
int err; /* Error flag */ |
int err; /* Error flag */ |
61 |
int non_eval_flag; |
int non_eval_flag; |
62 |
|
char *in_string; /* Input pending to be read */ |
63 |
} environment; |
} environment; |
64 |
|
|
65 |
/* A type for pointers to external functions */ |
/* A type for pointers to external functions */ |
71 |
{ |
{ |
72 |
int i; |
int i; |
73 |
|
|
74 |
|
env->in_string= NULL; |
75 |
env->err= 0; |
env->err= 0; |
76 |
env->non_eval_flag= 0; |
env->non_eval_flag= 0; |
77 |
for(i= 0; i<HASHTBLSIZE; i++) |
for(i= 0; i<HASHTBLSIZE; i++) |
898 |
push_int(&(env->head), env->err); |
push_int(&(env->head), env->err); |
899 |
} |
} |
900 |
|
|
901 |
|
extern void read(environment*); |
902 |
|
|
903 |
int main() |
int main() |
904 |
{ |
{ |
905 |
environment myenv; |
environment myenv; |
|
char in_string[100]; |
|
906 |
|
|
907 |
init_env(&myenv); |
init_env(&myenv); |
908 |
|
|
909 |
printf("okidok\n "); |
while(1) { |
910 |
|
if(myenv.in_string==NULL) |
911 |
while(fgets(in_string, 100, stdin) != NULL) { |
printf("okidok\n "); |
912 |
stack_read(&myenv, in_string); |
read(&myenv); |
913 |
if(myenv.err) { |
if(myenv.err) { |
914 |
printf("(error %d) ", myenv.err); |
printf("(error %d) ", myenv.err); |
915 |
myenv.err=0; |
myenv.err=0; |
916 |
|
} else if(myenv.head->item->type==symb |
917 |
|
&& ((symbol*)(myenv.head->item->content.ptr))->id[0]==';') { |
918 |
|
toss(&myenv); /* No error check in main */ |
919 |
|
eval(&myenv); |
920 |
} |
} |
|
printf("okidok\n "); |
|
921 |
} |
} |
922 |
quit(&myenv); |
quit(&myenv); |
923 |
return EXIT_FAILURE; |
return EXIT_FAILURE; |
1273 |
push_sym(env, "["); |
push_sym(env, "["); |
1274 |
pack(env); if(env->err) return; |
pack(env); if(env->err) return; |
1275 |
} |
} |
1276 |
|
|
1277 |
|
/* Read a string */ |
1278 |
|
extern void readline(environment *env) { |
1279 |
|
char in_string[101]; |
1280 |
|
|
1281 |
|
fgets(in_string, 100, stdin); |
1282 |
|
push_cstring(&(env->head), in_string); |
1283 |
|
} |
1284 |
|
|
1285 |
|
/* Read a value and place on stack */ |
1286 |
|
extern void read(environment *env) { |
1287 |
|
const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%100c"; |
1288 |
|
const char strform[]= "\"%[^\"]\"%100c"; |
1289 |
|
const char intform[]= "%i%100c"; |
1290 |
|
const char blankform[]= "%*[ \t]%100c"; |
1291 |
|
const char ebrackform[]= "%*1[]]%100c"; |
1292 |
|
const char semicform[]= "%*1[;]%100c"; |
1293 |
|
const char bbrackform[]= "%*1[[]%100c"; |
1294 |
|
|
1295 |
|
int itemp, rerun= 0; |
1296 |
|
static int depth= 0; |
1297 |
|
char *rest, *match; |
1298 |
|
size_t inlength; |
1299 |
|
|
1300 |
|
if(env->in_string==NULL) { |
1301 |
|
readline(env); if(env->err) return; |
1302 |
|
|
1303 |
|
env->in_string= malloc(strlen(env->head->item->content.ptr)+1); |
1304 |
|
strcpy(env->in_string, env->head->item->content.ptr); |
1305 |
|
toss(env); if(env->err) return; |
1306 |
|
} |
1307 |
|
|
1308 |
|
inlength= strlen(env->in_string)+1; |
1309 |
|
match= malloc(inlength); |
1310 |
|
rest= malloc(inlength); |
1311 |
|
|
1312 |
|
if(sscanf(env->in_string, blankform, rest)) { |
1313 |
|
rerun= 1; |
1314 |
|
} else if(sscanf(env->in_string, intform, &itemp, rest) > 0) { |
1315 |
|
push_int(&(env->head), itemp); |
1316 |
|
} else if(sscanf(env->in_string, strform, match, rest) > 0) { |
1317 |
|
push_cstring(&(env->head), match); |
1318 |
|
} else if(sscanf(env->in_string, symbform, match, rest) > 0) { |
1319 |
|
push_sym(env, match); |
1320 |
|
} else if(sscanf(env->in_string, ebrackform, rest) > 0) { |
1321 |
|
push_sym(env, "["); |
1322 |
|
pack(env); if(env->err) return; |
1323 |
|
if(depth!=0) depth--; |
1324 |
|
} else if(sscanf(env->in_string, semicform, rest) > 0) { |
1325 |
|
push_sym(env, ";"); |
1326 |
|
} else if(sscanf(env->in_string, bbrackform, rest) > 0) { |
1327 |
|
push_sym(env, "["); |
1328 |
|
depth++; |
1329 |
|
} else { |
1330 |
|
free(rest); |
1331 |
|
rest= NULL; |
1332 |
|
} |
1333 |
|
|
1334 |
|
free(env->in_string); |
1335 |
|
free(match); |
1336 |
|
|
1337 |
|
env->in_string= rest; |
1338 |
|
|
1339 |
|
if(rerun || depth) |
1340 |
|
return read(env); |
1341 |
|
} |