Guido van Rossum | 1984f1e | 1992-08-04 12:41:02 +0000 | [diff] [blame^] | 1 | /*********************************************************** |
| 2 | Copyright 1991, 1992 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 | |
| 25 | /* Python interpreter top-level routines, including init/exit */ |
| 26 | |
| 27 | #include "allobjects.h" |
| 28 | |
| 29 | #include "grammar.h" |
| 30 | #include "node.h" |
| 31 | #include "parsetok.h" |
| 32 | #include "graminit.h" |
| 33 | #include "errcode.h" |
| 34 | #include "sysmodule.h" |
| 35 | #include "compile.h" |
| 36 | #include "ceval.h" |
| 37 | #include "pythonrun.h" |
| 38 | #include "import.h" |
| 39 | |
| 40 | #ifdef USE_THREAD |
| 41 | extern void *save_thread(); |
| 42 | #endif |
| 43 | |
| 44 | extern char *getpythonpath(); |
| 45 | |
| 46 | extern grammar gram; /* From graminit.c */ |
| 47 | |
| 48 | int debugging; /* Needed by parser.c */ |
| 49 | int verbose; /* Needed by import.c */ |
| 50 | |
| 51 | /* Initialize all */ |
| 52 | |
| 53 | void |
| 54 | initall() |
| 55 | { |
| 56 | static int inited; |
| 57 | |
| 58 | if (inited) |
| 59 | return; |
| 60 | inited = 1; |
| 61 | |
| 62 | initimport(); |
| 63 | |
| 64 | /* Modules 'builtin' and 'sys' are initialized here, |
| 65 | they are needed by random bits of the interpreter. |
| 66 | All other modules are optional and are initialized |
| 67 | when they are first imported. */ |
| 68 | |
| 69 | initbuiltin(); /* Also initializes builtin exceptions */ |
| 70 | initsys(); |
| 71 | |
| 72 | initcalls(); /* Configuration-dependent initializations */ |
| 73 | |
| 74 | initintr(); /* For intrcheck() */ |
| 75 | |
| 76 | setpythonpath(getpythonpath()); |
| 77 | } |
| 78 | |
| 79 | /* Parse input from a file and execute it */ |
| 80 | |
| 81 | int |
| 82 | run(fp, filename) |
| 83 | FILE *fp; |
| 84 | char *filename; |
| 85 | { |
| 86 | if (filename == NULL) |
| 87 | filename = "???"; |
| 88 | if (isatty((int)fileno(fp))) |
| 89 | return run_tty_loop(fp, filename); |
| 90 | else |
| 91 | return run_script(fp, filename); |
| 92 | } |
| 93 | |
| 94 | int |
| 95 | run_tty_loop(fp, filename) |
| 96 | FILE *fp; |
| 97 | char *filename; |
| 98 | { |
| 99 | object *v; |
| 100 | int ret; |
| 101 | v = sysget("ps1"); |
| 102 | if (v == NULL) { |
| 103 | sysset("ps1", v = newstringobject(">>> ")); |
| 104 | XDECREF(v); |
| 105 | } |
| 106 | v = sysget("ps2"); |
| 107 | if (v == NULL) { |
| 108 | sysset("ps2", v = newstringobject("... ")); |
| 109 | XDECREF(v); |
| 110 | } |
| 111 | for (;;) { |
| 112 | ret = run_tty_1(fp, filename); |
| 113 | #ifdef REF_DEBUG |
| 114 | fprintf(stderr, "[%ld refs]\n", ref_total); |
| 115 | #endif |
| 116 | if (ret == E_EOF) |
| 117 | return 0; |
| 118 | /* |
| 119 | if (ret == E_NOMEM) |
| 120 | return -1; |
| 121 | */ |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | int |
| 126 | run_tty_1(fp, filename) |
| 127 | FILE *fp; |
| 128 | char *filename; |
| 129 | { |
| 130 | void *save, *save_thread(), restore_thread(); |
| 131 | object *m, *d, *v, *w; |
| 132 | node *n; |
| 133 | char *ps1, *ps2; |
| 134 | int err; |
| 135 | v = sysget("ps1"); |
| 136 | w = sysget("ps2"); |
| 137 | if (v != NULL && is_stringobject(v)) { |
| 138 | INCREF(v); |
| 139 | ps1 = getstringvalue(v); |
| 140 | } |
| 141 | else { |
| 142 | v = NULL; |
| 143 | ps1 = ""; |
| 144 | } |
| 145 | if (w != NULL && is_stringobject(w)) { |
| 146 | INCREF(w); |
| 147 | ps2 = getstringvalue(w); |
| 148 | } |
| 149 | else { |
| 150 | w = NULL; |
| 151 | ps2 = ""; |
| 152 | } |
| 153 | save = save_thread(); |
| 154 | err = parsefile(fp, filename, &gram, single_input, ps1, ps2, &n); |
| 155 | restore_thread(save); |
| 156 | XDECREF(v); |
| 157 | XDECREF(w); |
| 158 | if (err == E_EOF) |
| 159 | return E_EOF; |
| 160 | if (err != E_DONE) { |
| 161 | err_input(err); |
| 162 | print_error(); |
| 163 | return err; |
| 164 | } |
| 165 | m = add_module("__main__"); |
| 166 | if (m == NULL) |
| 167 | return -1; |
| 168 | d = getmoduledict(m); |
| 169 | v = run_node(n, filename, d, d); |
| 170 | flushline(); |
| 171 | if (v == NULL) { |
| 172 | print_error(); |
| 173 | return -1; |
| 174 | } |
| 175 | DECREF(v); |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | int |
| 180 | run_script(fp, filename) |
| 181 | FILE *fp; |
| 182 | char *filename; |
| 183 | { |
| 184 | object *m, *d, *v; |
| 185 | m = add_module("__main__"); |
| 186 | if (m == NULL) |
| 187 | return -1; |
| 188 | d = getmoduledict(m); |
| 189 | v = run_file(fp, filename, file_input, d, d); |
| 190 | flushline(); |
| 191 | if (v == NULL) { |
| 192 | print_error(); |
| 193 | return -1; |
| 194 | } |
| 195 | DECREF(v); |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | int |
| 200 | run_command(command) |
| 201 | char *command; |
| 202 | { |
| 203 | object *m, *d, *v; |
| 204 | m = add_module("__main__"); |
| 205 | if (m == NULL) |
| 206 | return -1; |
| 207 | d = getmoduledict(m); |
| 208 | v = run_string(command, file_input, d, d); |
| 209 | flushline(); |
| 210 | if (v == NULL) { |
| 211 | print_error(); |
| 212 | return -1; |
| 213 | } |
| 214 | DECREF(v); |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | void |
| 219 | print_error() |
| 220 | { |
| 221 | object *exception, *v; |
| 222 | err_get(&exception, &v); |
| 223 | if (exception == SystemExit) { |
| 224 | if (v == NULL || v == None) |
| 225 | goaway(0); |
| 226 | if (is_intobject(v)) |
| 227 | goaway((int)getintvalue(v)); |
| 228 | else { |
| 229 | printobject(v, stderr, PRINT_RAW); |
| 230 | fprintf(stderr, "\n"); |
| 231 | goaway(1); |
| 232 | } |
| 233 | } |
| 234 | sysset("last_type", exception); |
| 235 | sysset("last_value", v); |
| 236 | if (printobject(exception, stderr, PRINT_RAW) != 0) |
| 237 | err_clear(); |
| 238 | if (v != NULL && v != None) { |
| 239 | fprintf(stderr, ": "); |
| 240 | if (printobject(v, stderr, PRINT_RAW) != 0) |
| 241 | err_clear(); |
| 242 | } |
| 243 | fprintf(stderr, "\n"); |
| 244 | XDECREF(exception); |
| 245 | XDECREF(v); |
| 246 | printtraceback(stderr); |
| 247 | } |
| 248 | |
| 249 | object * |
| 250 | run_string(str, start, globals, locals) |
| 251 | char *str; |
| 252 | int start; |
| 253 | /*dict*/object *globals, *locals; |
| 254 | { |
| 255 | node *n; |
| 256 | int err; |
| 257 | err = parse_string(str, start, &n); |
| 258 | return run_err_node(err, n, "<string>", globals, locals); |
| 259 | } |
| 260 | |
| 261 | object * |
| 262 | run_file(fp, filename, start, globals, locals) |
| 263 | FILE *fp; |
| 264 | char *filename; |
| 265 | int start; |
| 266 | /*dict*/object *globals, *locals; |
| 267 | { |
| 268 | node *n; |
| 269 | int err; |
| 270 | err = parse_file(fp, filename, start, &n); |
| 271 | return run_err_node(err, n, filename, globals, locals); |
| 272 | } |
| 273 | |
| 274 | object * |
| 275 | run_err_node(err, n, filename, globals, locals) |
| 276 | int err; |
| 277 | node *n; |
| 278 | char *filename; |
| 279 | /*dict*/object *globals, *locals; |
| 280 | { |
| 281 | if (err != E_DONE) { |
| 282 | err_input(err); |
| 283 | return NULL; |
| 284 | } |
| 285 | return run_node(n, filename, globals, locals); |
| 286 | } |
| 287 | |
| 288 | object * |
| 289 | run_node(n, filename, globals, locals) |
| 290 | node *n; |
| 291 | char *filename; |
| 292 | /*dict*/object *globals, *locals; |
| 293 | { |
| 294 | if (globals == NULL) { |
| 295 | globals = getglobals(); |
| 296 | if (locals == NULL) |
| 297 | locals = getlocals(); |
| 298 | } |
| 299 | else { |
| 300 | if (locals == NULL) |
| 301 | locals = globals; |
| 302 | } |
| 303 | return eval_node(n, filename, globals, locals); |
| 304 | } |
| 305 | |
| 306 | object * |
| 307 | eval_node(n, filename, globals, locals) |
| 308 | node *n; |
| 309 | char *filename; |
| 310 | object *globals; |
| 311 | object *locals; |
| 312 | { |
| 313 | codeobject *co; |
| 314 | object *v; |
| 315 | co = compile(n, filename); |
| 316 | freetree(n); |
| 317 | if (co == NULL) |
| 318 | return NULL; |
| 319 | v = eval_code(co, globals, locals, (object *)NULL); |
| 320 | DECREF(co); |
| 321 | return v; |
| 322 | } |
| 323 | |
| 324 | /* Simplified interface to parsefile */ |
| 325 | |
| 326 | int |
| 327 | parse_file(fp, filename, start, n_ret) |
| 328 | FILE *fp; |
| 329 | char *filename; |
| 330 | int start; |
| 331 | node **n_ret; |
| 332 | { |
| 333 | return parsefile(fp, filename, &gram, start, |
| 334 | (char *)0, (char *)0, n_ret); |
| 335 | } |
| 336 | |
| 337 | /* Simplified interface to parsestring */ |
| 338 | |
| 339 | int |
| 340 | parse_string(str, start, n_ret) |
| 341 | char *str; |
| 342 | int start; |
| 343 | node **n_ret; |
| 344 | { |
| 345 | int err = parsestring(str, &gram, start, n_ret); |
| 346 | /* Don't confuse early end of string with early end of input */ |
| 347 | if (err == E_EOF) |
| 348 | err = E_SYNTAX; |
| 349 | return err; |
| 350 | } |
| 351 | |
| 352 | /* Print fatal error message and abort */ |
| 353 | |
| 354 | void |
| 355 | fatal(msg) |
| 356 | char *msg; |
| 357 | { |
| 358 | fprintf(stderr, "Fatal error: %s\n", msg); |
| 359 | abort(); |
| 360 | } |
| 361 | |
| 362 | /* Clean up and exit */ |
| 363 | |
| 364 | void |
| 365 | goaway(sts) |
| 366 | int sts; |
| 367 | { |
| 368 | flushline(); |
| 369 | |
| 370 | /* XXX Call doneimport() before donecalls(), since donecalls() |
| 371 | calls wdone(), and doneimport() may close windows */ |
| 372 | doneimport(); |
| 373 | donecalls(); |
| 374 | |
| 375 | err_clear(); |
| 376 | |
| 377 | #ifdef REF_DEBUG |
| 378 | fprintf(stderr, "[%ld refs]\n", ref_total); |
| 379 | #endif |
| 380 | |
| 381 | #ifdef TRACE_REFS |
| 382 | if (askyesno("Print left references?")) { |
| 383 | printrefs(stderr); |
| 384 | } |
| 385 | #endif /* TRACE_REFS */ |
| 386 | |
| 387 | #ifdef USE_THREAD |
| 388 | (void) save_thread(); |
| 389 | exit_prog(sts); |
| 390 | #else |
| 391 | exit(sts); |
| 392 | #endif |
| 393 | /*NOTREACHED*/ |
| 394 | } |
| 395 | |
| 396 | #ifdef TRACE_REFS |
| 397 | /* Ask a yes/no question */ |
| 398 | |
| 399 | static int |
| 400 | askyesno(prompt) |
| 401 | char *prompt; |
| 402 | { |
| 403 | char buf[256]; |
| 404 | |
| 405 | printf("%s [ny] ", prompt); |
| 406 | if (fgets(buf, sizeof buf, stdin) == NULL) |
| 407 | return 0; |
| 408 | return buf[0] == 'y' || buf[0] == 'Y'; |
| 409 | } |
| 410 | #endif |
| 411 | |
| 412 | #ifdef applec /* MPW (also usable for Think C 3.0) */ |
| 413 | |
| 414 | /* Check for file descriptor connected to interactive device. |
| 415 | Pretend that stdin is always interactive, other files never. */ |
| 416 | |
| 417 | int |
| 418 | isatty(fd) |
| 419 | int fd; |
| 420 | { |
| 421 | return fd == fileno(stdin); |
| 422 | } |
| 423 | |
| 424 | #endif |