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annotate Python/pythonmain.c @ 263:28f0ffd9facf legacy-trunk
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| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Tue, 04 Jun 1991 19:39:42 +0000 |
| parents | 6acd41a45d8d |
| children | d5c9ae422b41 |
| rev | line source |
|---|---|
| 145 | 1 /*********************************************************** |
| 2 Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The | |
| 3 Netherlands. | |
| 4 | |
| 5 All Rights Reserved | |
| 6 | |
| 7 Permission to use, copy, modify, and distribute this software and its | |
| 8 documentation for any purpose and without fee is hereby granted, | |
| 9 provided that the above copyright notice appear in all copies and that | |
| 10 both that copyright notice and this permission notice appear in | |
| 11 supporting documentation, and that the names of Stichting Mathematisch | |
| 12 Centrum or CWI not be used in advertising or publicity pertaining to | |
| 13 distribution of the software without specific, written prior permission. | |
| 14 | |
| 15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO | |
| 16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE | |
| 18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
| 21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 22 | |
| 23 ******************************************************************/ | |
| 24 | |
| 6 | 25 /* Python interpreter main program */ |
| 26 | |
|
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27 #include "allobjects.h" |
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28 |
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29 #include "patchlevel.h" |
| 6 | 30 |
| 31 #include "grammar.h" | |
| 32 #include "node.h" | |
| 33 #include "parsetok.h" | |
| 34 #include "graminit.h" | |
| 35 #include "errcode.h" | |
| 36 #include "sysmodule.h" | |
| 86 | 37 #include "compile.h" |
| 38 #include "ceval.h" | |
| 39 #include "pythonrun.h" | |
| 40 #include "import.h" | |
| 41 | |
| 42 extern char *getpythonpath(); | |
| 6 | 43 |
| 44 extern grammar gram; /* From graminit.c */ | |
| 45 | |
| 86 | 46 #ifdef DEBUG |
| 47 int debugging; /* Needed by parser.c */ | |
| 48 #endif | |
| 6 | 49 |
| 50 main(argc, argv) | |
| 51 int argc; | |
| 52 char **argv; | |
| 53 { | |
| 54 char *filename = NULL; | |
| 55 FILE *fp = stdin; | |
| 86 | 56 |
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57 initargs(&argc, &argv); |
| 6 | 58 |
| 59 if (argc > 1 && strcmp(argv[1], "-") != 0) | |
| 60 filename = argv[1]; | |
| 86 | 61 |
| 6 | 62 if (filename != NULL) { |
| 63 if ((fp = fopen(filename, "r")) == NULL) { | |
| 64 fprintf(stderr, "python: can't open file '%s'\n", | |
| 65 filename); | |
| 66 exit(2); | |
| 67 } | |
| 68 } | |
| 69 | |
| 86 | 70 initall(); |
| 71 | |
| 72 setpythonpath(getpythonpath()); | |
| 73 setpythonargv(argc-1, argv+1); | |
| 6 | 74 |
| 86 | 75 goaway(run(fp, filename == NULL ? "<stdin>" : filename)); |
| 76 /*NOTREACHED*/ | |
| 77 } | |
| 78 | |
| 79 /* Initialize all */ | |
| 80 | |
| 81 void | |
| 82 initall() | |
| 83 { | |
| 84 static int inited; | |
| 85 | |
| 86 if (inited) | |
| 87 return; | |
|
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88 inited = 1; |
| 86 | 89 |
| 90 initimport(); | |
| 91 | |
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92 /* Modules 'builtin' and 'sys' are initialized here, |
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93 they are needed by random bits of the interpreter. |
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94 All other modules are optional and should be initialized |
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95 by the initcalls() of a specific configuration. */ |
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96 |
| 86 | 97 initbuiltin(); /* Also initializes builtin exceptions */ |
| 98 initsys(); | |
| 6 | 99 |
| 86 | 100 initcalls(); /* Configuration-dependent initializations */ |
| 101 | |
| 102 initintr(); /* For intrcheck() */ | |
| 103 } | |
| 104 | |
| 105 /* Parse input from a file and execute it */ | |
| 106 | |
| 107 int | |
| 108 run(fp, filename) | |
| 109 FILE *fp; | |
| 110 char *filename; | |
| 111 { | |
| 112 if (filename == NULL) | |
| 113 filename = "???"; | |
| 114 if (isatty(fileno(fp))) | |
| 115 return run_tty_loop(fp, filename); | |
| 116 else | |
| 117 return run_script(fp, filename); | |
| 118 } | |
| 119 | |
| 120 int | |
| 121 run_tty_loop(fp, filename) | |
| 122 FILE *fp; | |
| 123 char *filename; | |
| 124 { | |
| 125 object *v; | |
| 126 int ret; | |
| 127 v = sysget("ps1"); | |
| 128 if (v == NULL) { | |
| 129 sysset("ps1", v = newstringobject(">>> ")); | |
| 130 XDECREF(v); | |
| 131 } | |
| 132 v = sysget("ps2"); | |
| 133 if (v == NULL) { | |
| 134 sysset("ps2", v = newstringobject("... ")); | |
| 135 XDECREF(v); | |
| 136 } | |
| 137 for (;;) { | |
| 138 ret = run_tty_1(fp, filename); | |
| 139 #ifdef REF_DEBUG | |
| 140 fprintf(stderr, "[%ld refs]\n", ref_total); | |
| 141 #endif | |
| 142 if (ret == E_EOF) | |
| 143 return 0; | |
| 144 /* | |
| 145 if (ret == E_NOMEM) | |
| 146 return -1; | |
| 147 */ | |
| 148 } | |
| 149 } | |
| 150 | |
| 151 int | |
| 152 run_tty_1(fp, filename) | |
| 153 FILE *fp; | |
| 154 char *filename; | |
| 155 { | |
| 156 object *m, *d, *v, *w; | |
| 157 node *n; | |
| 158 char *ps1, *ps2; | |
| 159 int err; | |
| 160 v = sysget("ps1"); | |
| 161 w = sysget("ps2"); | |
| 162 if (v != NULL && is_stringobject(v)) { | |
| 163 INCREF(v); | |
| 164 ps1 = getstringvalue(v); | |
| 165 } | |
| 166 else { | |
| 167 v = NULL; | |
| 168 ps1 = ""; | |
| 169 } | |
| 170 if (w != NULL && is_stringobject(w)) { | |
| 171 INCREF(w); | |
| 172 ps2 = getstringvalue(w); | |
| 6 | 173 } |
| 174 else { | |
| 86 | 175 w = NULL; |
| 176 ps2 = ""; | |
| 177 } | |
| 178 err = parsefile(fp, filename, &gram, single_input, ps1, ps2, &n); | |
| 179 XDECREF(v); | |
| 180 XDECREF(w); | |
| 181 if (err == E_EOF) | |
| 182 return E_EOF; | |
| 183 if (err != E_DONE) { | |
| 184 err_input(err); | |
| 185 print_error(); | |
| 186 return err; | |
| 187 } | |
| 188 m = add_module("__main__"); | |
| 189 if (m == NULL) | |
| 190 return -1; | |
| 191 d = getmoduledict(m); | |
| 192 v = run_node(n, filename, d, d); | |
| 193 flushline(); | |
| 194 if (v == NULL) { | |
| 195 print_error(); | |
| 196 return -1; | |
| 197 } | |
| 198 DECREF(v); | |
| 199 return 0; | |
| 200 } | |
| 201 | |
| 202 int | |
| 203 run_script(fp, filename) | |
| 204 FILE *fp; | |
| 205 char *filename; | |
| 206 { | |
| 207 object *m, *d, *v; | |
| 208 m = add_module("__main__"); | |
| 209 if (m == NULL) | |
| 210 return -1; | |
| 211 d = getmoduledict(m); | |
| 212 v = run_file(fp, filename, file_input, d, d); | |
| 213 flushline(); | |
| 214 if (v == NULL) { | |
| 215 print_error(); | |
| 216 return -1; | |
| 6 | 217 } |
| 86 | 218 DECREF(v); |
| 219 return 0; | |
| 220 } | |
| 221 | |
| 222 void | |
| 223 print_error() | |
| 224 { | |
| 225 object *exception, *v; | |
| 226 err_get(&exception, &v); | |
| 227 fprintf(stderr, "Unhandled exception: "); | |
| 228 printobject(exception, stderr, PRINT_RAW); | |
| 229 if (v != NULL && v != None) { | |
| 230 fprintf(stderr, ": "); | |
| 231 printobject(v, stderr, PRINT_RAW); | |
| 232 } | |
| 233 fprintf(stderr, "\n"); | |
| 234 XDECREF(exception); | |
| 235 XDECREF(v); | |
| 236 printtraceback(stderr); | |
| 237 } | |
| 238 | |
| 239 object * | |
| 240 run_string(str, start, globals, locals) | |
| 241 char *str; | |
| 242 int start; | |
| 243 /*dict*/object *globals, *locals; | |
| 244 { | |
| 245 node *n; | |
| 246 int err; | |
| 247 err = parse_string(str, start, &n); | |
| 248 return run_err_node(err, n, "<string>", globals, locals); | |
| 249 } | |
| 250 | |
| 251 object * | |
| 252 run_file(fp, filename, start, globals, locals) | |
| 253 FILE *fp; | |
| 254 char *filename; | |
| 255 int start; | |
| 256 /*dict*/object *globals, *locals; | |
| 257 { | |
| 258 node *n; | |
| 259 int err; | |
| 260 err = parse_file(fp, filename, start, &n); | |
| 261 return run_err_node(err, n, filename, globals, locals); | |
| 6 | 262 } |
| 263 | |
| 86 | 264 object * |
| 265 run_err_node(err, n, filename, globals, locals) | |
| 266 int err; | |
| 267 node *n; | |
| 268 char *filename; | |
| 269 /*dict*/object *globals, *locals; | |
| 270 { | |
| 271 if (err != E_DONE) { | |
| 272 err_input(err); | |
| 273 return NULL; | |
| 274 } | |
| 275 return run_node(n, filename, globals, locals); | |
| 276 } | |
| 277 | |
| 278 object * | |
| 279 run_node(n, filename, globals, locals) | |
| 280 node *n; | |
| 281 char *filename; | |
| 282 /*dict*/object *globals, *locals; | |
| 283 { | |
| 284 if (globals == NULL) { | |
| 285 globals = getglobals(); | |
| 286 if (locals == NULL) | |
| 287 locals = getlocals(); | |
| 288 } | |
| 289 else { | |
| 290 if (locals == NULL) | |
| 291 locals = globals; | |
| 292 } | |
| 293 return eval_node(n, filename, globals, locals); | |
| 294 } | |
| 295 | |
| 296 object * | |
| 297 eval_node(n, filename, globals, locals) | |
| 298 node *n; | |
| 299 char *filename; | |
| 300 object *globals; | |
| 301 object *locals; | |
| 302 { | |
| 303 codeobject *co; | |
| 304 object *v; | |
| 305 co = compile(n, filename); | |
| 306 freetree(n); | |
| 307 if (co == NULL) | |
| 308 return NULL; | |
| 309 v = eval_code(co, globals, locals, (object *)NULL); | |
| 310 DECREF(co); | |
| 311 return v; | |
| 312 } | |
| 313 | |
| 314 /* Simplified interface to parsefile */ | |
| 315 | |
| 316 int | |
| 317 parse_file(fp, filename, start, n_ret) | |
| 318 FILE *fp; | |
| 319 char *filename; | |
| 320 int start; | |
| 321 node **n_ret; | |
| 322 { | |
| 323 return parsefile(fp, filename, &gram, start, | |
| 324 (char *)0, (char *)0, n_ret); | |
| 325 } | |
| 326 | |
| 327 /* Simplified interface to parsestring */ | |
| 328 | |
| 329 int | |
| 330 parse_string(str, start, n_ret) | |
| 331 char *str; | |
| 332 int start; | |
| 333 node **n_ret; | |
| 334 { | |
| 335 int err = parsestring(str, &gram, start, n_ret); | |
| 336 /* Don't confuse early end of string with early end of input */ | |
| 337 if (err == E_EOF) | |
| 338 err = E_SYNTAX; | |
| 339 return err; | |
| 340 } | |
| 341 | |
| 342 /* Print fatal error message and abort */ | |
| 343 | |
| 344 void | |
| 345 fatal(msg) | |
| 346 char *msg; | |
| 347 { | |
| 348 fprintf(stderr, "Fatal error: %s\n", msg); | |
| 349 abort(); | |
| 350 } | |
| 351 | |
| 352 /* Clean up and exit */ | |
| 353 | |
| 354 void | |
| 6 | 355 goaway(sts) |
| 356 int sts; | |
| 357 { | |
| 86 | 358 flushline(); |
| 359 | |
| 360 /* XXX Call doneimport() before donecalls(), since donecalls() | |
| 361 calls wdone(), and doneimport() may close windows */ | |
| 362 doneimport(); | |
| 363 donecalls(); | |
| 364 | |
| 365 err_clear(); | |
| 366 | |
| 367 #ifdef REF_DEBUG | |
| 368 fprintf(stderr, "[%ld refs]\n", ref_total); | |
| 369 #endif | |
| 370 | |
| 371 #ifdef TRACE_REFS | |
| 372 if (askyesno("Print left references?")) { | |
| 373 printrefs(stderr); | |
| 374 } | |
| 375 #endif /* TRACE_REFS */ | |
| 376 | |
| 6 | 377 exit(sts); |
| 378 /*NOTREACHED*/ | |
| 379 } | |
| 380 | |
| 86 | 381 static |
| 382 finaloutput() | |
| 6 | 383 { |
| 86 | 384 #ifdef TRACE_REFS |
| 385 if (!askyesno("Print left references?")) | |
| 386 return; | |
| 387 printrefs(stderr); | |
| 388 #endif /* TRACE_REFS */ | |
| 6 | 389 } |
| 390 | |
| 391 /* Ask a yes/no question */ | |
| 392 | |
| 86 | 393 static int |
| 6 | 394 askyesno(prompt) |
| 395 char *prompt; | |
| 396 { | |
| 397 char buf[256]; | |
| 398 | |
| 399 printf("%s [ny] ", prompt); | |
| 400 if (fgets(buf, sizeof buf, stdin) == NULL) | |
| 401 return 0; | |
| 402 return buf[0] == 'y' || buf[0] == 'Y'; | |
| 403 } | |
| 404 | |
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405 #ifdef applec /* MPW (also usable for Think C 3.0) */ |
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406 |
| 6 | 407 /* Check for file descriptor connected to interactive device. |
| 408 Pretend that stdin is always interactive, other files never. */ | |
| 409 | |
| 410 int | |
| 411 isatty(fd) | |
| 412 int fd; | |
| 413 { | |
| 414 return fd == fileno(stdin); | |
| 415 } | |
| 416 | |
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417 #endif |