Mercurial > vim
annotate src/ex_eval.c @ 5409:38a755adc580 v7.4.055
updated for version 7.4.055
Problem: Mac: Where availability macros are defined depends on the system.
Solution: Add a configure check. (Felix B?nemann)
| author | Bram Moolenaar <bram@vim.org> |
|---|---|
| date | Sat, 02 Nov 2013 21:04:38 +0100 |
| parents | 66803af09906 |
| children | 064e2a080e2e |
| rev | line source |
|---|---|
| 7 | 1 /* vi:set ts=8 sts=4 sw=4: |
| 2 * | |
| 3 * VIM - Vi IMproved by Bram Moolenaar | |
| 4 * | |
| 5 * Do ":help uganda" in Vim to read copying and usage conditions. | |
| 6 * Do ":help credits" in Vim to see a list of people who contributed. | |
| 7 * See README.txt for an overview of the Vim source code. | |
| 8 */ | |
| 9 | |
| 10 /* | |
| 11 * ex_eval.c: functions for Ex command line for the +eval feature. | |
| 12 */ | |
| 13 | |
| 14 #include "vim.h" | |
| 15 | |
| 16 #if defined(FEAT_EVAL) || defined(PROTO) | |
| 17 | |
| 18 static void free_msglist __ARGS((struct msglist *l)); | |
| 19 static int throw_exception __ARGS((void *, int, char_u *)); | |
| 75 | 20 static char_u *get_end_emsg __ARGS((struct condstack *cstack)); |
| 7 | 21 |
| 22 /* | |
| 23 * Exception handling terms: | |
| 24 * | |
| 25 * :try ":try" command \ | |
| 26 * ... try block | | |
| 27 * :catch RE ":catch" command | | |
| 28 * ... catch clause |- try conditional | |
| 29 * :finally ":finally" command | | |
| 30 * ... finally clause | | |
| 31 * :endtry ":endtry" command / | |
| 32 * | |
| 33 * The try conditional may have any number of catch clauses and at most one | |
| 34 * finally clause. A ":throw" command can be inside the try block, a catch | |
| 35 * clause, the finally clause, or in a function called or script sourced from | |
| 36 * there or even outside the try conditional. Try conditionals may be nested. | |
| 37 */ | |
| 38 | |
| 39 /* | |
| 40 * Configuration whether an exception is thrown on error or interrupt. When | |
| 41 * the preprocessor macros below evaluate to FALSE, an error (did_emsg) or | |
| 42 * interrupt (got_int) under an active try conditional terminates the script | |
| 43 * after the non-active finally clauses of all active try conditionals have been | |
| 44 * executed. Otherwise, errors and/or interrupts are converted into catchable | |
| 45 * exceptions (did_throw additionally set), which terminate the script only if | |
| 46 * not caught. For user exceptions, only did_throw is set. (Note: got_int can | |
| 4352 | 47 * be set asynchronously afterwards by a SIGINT, so did_throw && got_int is not |
| 7 | 48 * a reliant test that the exception currently being thrown is an interrupt |
| 49 * exception. Similarly, did_emsg can be set afterwards on an error in an | |
| 50 * (unskipped) conditional command inside an inactive conditional, so did_throw | |
| 51 * && did_emsg is not a reliant test that the exception currently being thrown | |
| 52 * is an error exception.) - The macros can be defined as expressions checking | |
| 53 * for a variable that is allowed to be changed during execution of a script. | |
| 54 */ | |
| 55 #if 0 | |
| 56 /* Expressions used for testing during the development phase. */ | |
| 57 # define THROW_ON_ERROR (!eval_to_number("$VIMNOERRTHROW")) | |
| 58 # define THROW_ON_INTERRUPT (!eval_to_number("$VIMNOINTTHROW")) | |
| 59 # define THROW_TEST | |
| 60 #else | |
| 61 /* Values used for the Vim release. */ | |
| 62 # define THROW_ON_ERROR TRUE | |
| 1880 | 63 # define THROW_ON_ERROR_TRUE |
| 7 | 64 # define THROW_ON_INTERRUPT TRUE |
| 1880 | 65 # define THROW_ON_INTERRUPT_TRUE |
| 7 | 66 #endif |
| 67 | |
| 68 static void catch_exception __ARGS((except_T *excp)); | |
| 69 static void finish_exception __ARGS((except_T *excp)); | |
| 70 static void discard_exception __ARGS((except_T *excp, int was_finished)); | |
| 71 static void report_pending __ARGS((int action, int pending, void *value)); | |
| 72 | |
| 73 /* | |
| 74 * When several errors appear in a row, setting "force_abort" is delayed until | |
| 75 * the failing command returned. "cause_abort" is set to TRUE meanwhile, in | |
| 76 * order to indicate that situation. This is useful when "force_abort" was set | |
| 77 * during execution of a function call from an expression: the aborting of the | |
| 78 * expression evaluation is done without producing any error messages, but all | |
| 79 * error messages on parsing errors during the expression evaluation are given | |
| 80 * (even if a try conditional is active). | |
| 81 */ | |
| 82 static int cause_abort = FALSE; | |
| 83 | |
| 84 /* | |
| 1214 | 85 * Return TRUE when immediately aborting on error, or when an interrupt |
| 7 | 86 * occurred or an exception was thrown but not caught. Use for ":{range}call" |
| 87 * to check whether an aborted function that does not handle a range itself | |
| 88 * should be called again for the next line in the range. Also used for | |
| 89 * cancelling expression evaluation after a function call caused an immediate | |
| 90 * abort. Note that the first emsg() call temporarily resets "force_abort" | |
| 91 * until the throw point for error messages has been reached. That is, during | |
| 92 * cancellation of an expression evaluation after an aborting function call or | |
| 93 * due to a parsing error, aborting() always returns the same value. | |
| 94 */ | |
| 95 int | |
| 96 aborting() | |
| 97 { | |
| 98 return (did_emsg && force_abort) || got_int || did_throw; | |
| 99 } | |
| 100 | |
| 101 /* | |
| 102 * The value of "force_abort" is temporarily reset by the first emsg() call | |
| 103 * during an expression evaluation, and "cause_abort" is used instead. It might | |
| 104 * be necessary to restore "force_abort" even before the throw point for the | |
| 105 * error message has been reached. update_force_abort() should be called then. | |
| 106 */ | |
| 107 void | |
| 108 update_force_abort() | |
| 109 { | |
| 110 if (cause_abort) | |
| 111 force_abort = TRUE; | |
| 112 } | |
| 113 | |
| 114 /* | |
| 115 * Return TRUE if a command with a subcommand resulting in "retcode" should | |
| 116 * abort the script processing. Can be used to suppress an autocommand after | |
| 117 * execution of a failing subcommand as long as the error message has not been | |
| 118 * displayed and actually caused the abortion. | |
| 119 */ | |
| 120 int | |
| 121 should_abort(retcode) | |
| 122 int retcode; | |
| 123 { | |
| 124 return ((retcode == FAIL && trylevel != 0 && !emsg_silent) || aborting()); | |
| 125 } | |
| 126 | |
| 127 /* | |
| 128 * Return TRUE if a function with the "abort" flag should not be considered | |
| 129 * ended on an error. This means that parsing commands is continued in order | |
| 130 * to find finally clauses to be executed, and that some errors in skipped | |
| 131 * commands are still reported. | |
| 132 */ | |
| 133 int | |
| 134 aborted_in_try() | |
| 135 { | |
| 136 /* This function is only called after an error. In this case, "force_abort" | |
| 137 * determines whether searching for finally clauses is necessary. */ | |
| 138 return force_abort; | |
| 139 } | |
| 140 | |
| 141 /* | |
| 142 * cause_errthrow(): Cause a throw of an error exception if appropriate. | |
| 143 * Return TRUE if the error message should not be displayed by emsg(). | |
| 144 * Sets "ignore", if the emsg() call should be ignored completely. | |
| 145 * | |
| 146 * When several messages appear in the same command, the first is usually the | |
| 147 * most specific one and used as the exception value. The "severe" flag can be | |
| 148 * set to TRUE, if a later but severer message should be used instead. | |
| 149 */ | |
| 150 int | |
| 151 cause_errthrow(mesg, severe, ignore) | |
| 152 char_u *mesg; | |
| 153 int severe; | |
| 154 int *ignore; | |
| 155 { | |
| 156 struct msglist *elem; | |
| 157 struct msglist **plist; | |
| 158 | |
| 159 /* | |
| 839 | 160 * Do nothing when displaying the interrupt message or reporting an |
| 161 * uncaught exception (which has already been discarded then) at the top | |
| 162 * level. Also when no exception can be thrown. The message will be | |
| 163 * displayed by emsg(). | |
| 7 | 164 */ |
| 165 if (suppress_errthrow) | |
| 166 return FALSE; | |
| 167 | |
| 168 /* | |
| 839 | 169 * If emsg() has not been called previously, temporarily reset |
| 170 * "force_abort" until the throw point for error messages has been | |
| 171 * reached. This ensures that aborting() returns the same value for all | |
| 172 * errors that appear in the same command. This means particularly that | |
| 173 * for parsing errors during expression evaluation emsg() will be called | |
| 174 * multiply, even when the expression is evaluated from a finally clause | |
| 175 * that was activated due to an aborting error, interrupt, or exception. | |
| 7 | 176 */ |
| 177 if (!did_emsg) | |
| 178 { | |
| 179 cause_abort = force_abort; | |
| 180 force_abort = FALSE; | |
| 181 } | |
| 182 | |
| 183 /* | |
| 184 * If no try conditional is active and no exception is being thrown and | |
| 185 * there has not been an error in a try conditional or a throw so far, do | |
| 839 | 186 * nothing (for compatibility of non-EH scripts). The message will then |
| 187 * be displayed by emsg(). When ":silent!" was used and we are not | |
| 188 * currently throwing an exception, do nothing. The message text will | |
| 189 * then be stored to v:errmsg by emsg() without displaying it. | |
| 7 | 190 */ |
| 191 if (((trylevel == 0 && !cause_abort) || emsg_silent) && !did_throw) | |
| 192 return FALSE; | |
| 193 | |
| 194 /* | |
| 195 * Ignore an interrupt message when inside a try conditional or when an | |
| 839 | 196 * exception is being thrown or when an error in a try conditional or |
| 197 * throw has been detected previously. This is important in order that an | |
| 7 | 198 * interrupt exception is catchable by the innermost try conditional and |
| 199 * not replaced by an interrupt message error exception. | |
| 200 */ | |
| 201 if (mesg == (char_u *)_(e_interr)) | |
| 202 { | |
| 203 *ignore = TRUE; | |
| 204 return TRUE; | |
| 205 } | |
| 206 | |
| 207 /* | |
| 208 * Ensure that all commands in nested function calls and sourced files | |
| 209 * are aborted immediately. | |
| 210 */ | |
| 211 cause_abort = TRUE; | |
| 212 | |
| 213 /* | |
| 214 * When an exception is being thrown, some commands (like conditionals) are | |
| 215 * not skipped. Errors in those commands may affect what of the subsequent | |
| 216 * commands are regarded part of catch and finally clauses. Catching the | |
| 217 * exception would then cause execution of commands not intended by the | |
| 218 * user, who wouldn't even get aware of the problem. Therefor, discard the | |
| 219 * exception currently being thrown to prevent it from being caught. Just | |
| 220 * execute finally clauses and terminate. | |
| 221 */ | |
| 222 if (did_throw) | |
| 223 { | |
| 224 /* When discarding an interrupt exception, reset got_int to prevent the | |
| 225 * same interrupt being converted to an exception again and discarding | |
| 226 * the error exception we are about to throw here. */ | |
| 227 if (current_exception->type == ET_INTERRUPT) | |
| 228 got_int = FALSE; | |
| 229 discard_current_exception(); | |
| 230 } | |
| 231 | |
| 232 #ifdef THROW_TEST | |
| 233 if (!THROW_ON_ERROR) | |
| 234 { | |
| 235 /* | |
| 236 * Print error message immediately without searching for a matching | |
| 237 * catch clause; just finally clauses are executed before the script | |
| 238 * is terminated. | |
| 239 */ | |
| 240 return FALSE; | |
| 241 } | |
| 242 else | |
| 243 #endif | |
| 244 { | |
| 245 /* | |
| 246 * Prepare the throw of an error exception, so that everything will | |
| 247 * be aborted (except for executing finally clauses), until the error | |
| 248 * exception is caught; if still uncaught at the top level, the error | |
| 249 * message will be displayed and the script processing terminated | |
| 250 * then. - This function has no access to the conditional stack. | |
| 251 * Thus, the actual throw is made after the failing command has | |
| 252 * returned. - Throw only the first of several errors in a row, except | |
| 253 * a severe error is following. | |
| 254 */ | |
| 255 if (msg_list != NULL) | |
| 256 { | |
| 257 plist = msg_list; | |
| 258 while (*plist != NULL) | |
| 259 plist = &(*plist)->next; | |
| 260 | |
| 261 elem = (struct msglist *)alloc((unsigned)sizeof(struct msglist)); | |
| 262 if (elem == NULL) | |
| 263 { | |
| 264 suppress_errthrow = TRUE; | |
| 265 EMSG(_(e_outofmem)); | |
| 266 } | |
| 267 else | |
| 268 { | |
| 269 elem->msg = vim_strsave(mesg); | |
| 270 if (elem->msg == NULL) | |
| 271 { | |
| 272 vim_free(elem); | |
| 273 suppress_errthrow = TRUE; | |
| 274 EMSG(_(e_outofmem)); | |
| 275 } | |
| 276 else | |
| 277 { | |
| 278 elem->next = NULL; | |
| 279 elem->throw_msg = NULL; | |
| 280 *plist = elem; | |
| 281 if (plist == msg_list || severe) | |
| 282 { | |
| 283 char_u *tmsg; | |
| 284 | |
| 285 /* Skip the extra "Vim " prefix for message "E458". */ | |
| 286 tmsg = elem->msg; | |
| 287 if (STRNCMP(tmsg, "Vim E", 5) == 0 | |
| 288 && VIM_ISDIGIT(tmsg[5]) | |
| 289 && VIM_ISDIGIT(tmsg[6]) | |
| 290 && VIM_ISDIGIT(tmsg[7]) | |
| 291 && tmsg[8] == ':' | |
| 292 && tmsg[9] == ' ') | |
| 293 (*msg_list)->throw_msg = &tmsg[4]; | |
| 294 else | |
| 295 (*msg_list)->throw_msg = tmsg; | |
| 296 } | |
| 297 } | |
| 298 } | |
| 299 } | |
| 300 return TRUE; | |
| 301 } | |
| 302 } | |
| 303 | |
| 304 /* | |
| 305 * Free a "msg_list" and the messages it contains. | |
| 306 */ | |
| 307 static void | |
| 308 free_msglist(l) | |
| 309 struct msglist *l; | |
| 310 { | |
| 311 struct msglist *messages, *next; | |
| 312 | |
| 313 messages = l; | |
| 314 while (messages != NULL) | |
| 315 { | |
| 316 next = messages->next; | |
| 317 vim_free(messages->msg); | |
| 318 vim_free(messages); | |
| 319 messages = next; | |
| 320 } | |
| 321 } | |
| 322 | |
| 323 /* | |
| 324 * Throw the message specified in the call to cause_errthrow() above as an | |
| 325 * error exception. If cstack is NULL, postpone the throw until do_cmdline() | |
| 326 * has returned (see do_one_cmd()). | |
| 327 */ | |
| 328 void | |
| 329 do_errthrow(cstack, cmdname) | |
| 330 struct condstack *cstack; | |
| 331 char_u *cmdname; | |
| 332 { | |
| 333 /* | |
| 334 * Ensure that all commands in nested function calls and sourced files | |
| 335 * are aborted immediately. | |
| 336 */ | |
| 337 if (cause_abort) | |
| 338 { | |
| 339 cause_abort = FALSE; | |
| 340 force_abort = TRUE; | |
| 341 } | |
| 342 | |
| 343 /* If no exception is to be thrown or the conversion should be done after | |
| 344 * returning to a previous invocation of do_one_cmd(), do nothing. */ | |
| 1046 | 345 if (msg_list == NULL || *msg_list == NULL) |
| 7 | 346 return; |
| 347 | |
| 348 if (throw_exception(*msg_list, ET_ERROR, cmdname) == FAIL) | |
| 349 free_msglist(*msg_list); | |
| 350 else | |
| 351 { | |
| 352 if (cstack != NULL) | |
| 353 do_throw(cstack); | |
| 354 else | |
| 355 need_rethrow = TRUE; | |
| 356 } | |
| 357 *msg_list = NULL; | |
| 358 } | |
| 359 | |
| 360 /* | |
| 361 * do_intthrow(): Replace the current exception by an interrupt or interrupt | |
| 362 * exception if appropriate. Return TRUE if the current exception is discarded, | |
| 363 * FALSE otherwise. | |
| 364 */ | |
| 365 int | |
| 366 do_intthrow(cstack) | |
| 367 struct condstack *cstack; | |
| 368 { | |
| 369 /* | |
| 370 * If no interrupt occurred or no try conditional is active and no exception | |
| 371 * is being thrown, do nothing (for compatibility of non-EH scripts). | |
| 372 */ | |
| 373 if (!got_int || (trylevel == 0 && !did_throw)) | |
| 374 return FALSE; | |
| 375 | |
| 376 #ifdef THROW_TEST /* avoid warning for condition always true */ | |
| 377 if (!THROW_ON_INTERRUPT) | |
| 378 { | |
| 379 /* | |
| 380 * The interrupt aborts everything except for executing finally clauses. | |
| 381 * Discard any user or error or interrupt exception currently being | |
| 382 * thrown. | |
| 383 */ | |
| 384 if (did_throw) | |
| 385 discard_current_exception(); | |
| 386 } | |
| 387 else | |
| 388 #endif | |
| 389 { | |
| 390 /* | |
| 391 * Throw an interrupt exception, so that everything will be aborted | |
| 392 * (except for executing finally clauses), until the interrupt exception | |
| 393 * is caught; if still uncaught at the top level, the script processing | |
| 394 * will be terminated then. - If an interrupt exception is already | |
| 395 * being thrown, do nothing. | |
| 396 * | |
| 397 */ | |
| 398 if (did_throw) | |
| 399 { | |
| 400 if (current_exception->type == ET_INTERRUPT) | |
| 401 return FALSE; | |
| 402 | |
| 403 /* An interrupt exception replaces any user or error exception. */ | |
| 404 discard_current_exception(); | |
| 405 } | |
| 406 if (throw_exception("Vim:Interrupt", ET_INTERRUPT, NULL) != FAIL) | |
| 407 do_throw(cstack); | |
| 408 } | |
| 409 | |
| 410 return TRUE; | |
| 411 } | |
| 412 | |
| 413 | |
| 414 /* | |
| 415 * Throw a new exception. Return FAIL when out of memory or it was tried to | |
| 416 * throw an illegal user exception. "value" is the exception string for a user | |
| 417 * or interrupt exception, or points to a message list in case of an error | |
| 418 * exception. | |
| 419 */ | |
| 420 static int | |
| 421 throw_exception(value, type, cmdname) | |
| 422 void *value; | |
| 423 int type; | |
| 424 char_u *cmdname; | |
| 425 { | |
| 426 except_T *excp; | |
| 427 char_u *p, *mesg, *val; | |
| 428 int cmdlen; | |
| 429 | |
| 430 /* | |
| 431 * Disallow faking Interrupt or error exceptions as user exceptions. They | |
| 432 * would be treated differently from real interrupt or error exceptions when | |
| 433 * no active try block is found, see do_cmdline(). | |
| 434 */ | |
| 435 if (type == ET_USER) | |
| 436 { | |
| 437 if (STRNCMP((char_u *)value, "Vim", 3) == 0 && | |
| 438 (((char_u *)value)[3] == NUL || ((char_u *)value)[3] == ':' || | |
| 439 ((char_u *)value)[3] == '(')) | |
| 440 { | |
| 441 EMSG(_("E608: Cannot :throw exceptions with 'Vim' prefix")); | |
| 442 goto fail; | |
| 443 } | |
| 444 } | |
| 445 | |
| 446 excp = (except_T *)alloc((unsigned)sizeof(except_T)); | |
| 447 if (excp == NULL) | |
| 448 goto nomem; | |
| 449 | |
| 450 if (type == ET_ERROR) | |
| 451 { | |
| 452 /* Store the original message and prefix the exception value with | |
| 453 * "Vim:" or, if a command name is given, "Vim(cmdname):". */ | |
| 454 excp->messages = (struct msglist *)value; | |
| 455 mesg = excp->messages->throw_msg; | |
| 456 if (cmdname != NULL && *cmdname != NUL) | |
| 457 { | |
| 835 | 458 cmdlen = (int)STRLEN(cmdname); |
| 7 | 459 excp->value = vim_strnsave((char_u *)"Vim(", |
| 460 4 + cmdlen + 2 + (int)STRLEN(mesg)); | |
| 461 if (excp->value == NULL) | |
| 462 goto nomem; | |
| 463 STRCPY(&excp->value[4], cmdname); | |
| 464 STRCPY(&excp->value[4 + cmdlen], "):"); | |
| 465 val = excp->value + 4 + cmdlen + 2; | |
| 466 } | |
| 467 else | |
| 468 { | |
| 469 excp->value = vim_strnsave((char_u *)"Vim:", 4 + (int)STRLEN(mesg)); | |
| 470 if (excp->value == NULL) | |
| 471 goto nomem; | |
| 472 val = excp->value + 4; | |
| 473 } | |
| 474 | |
| 475 /* msg_add_fname may have been used to prefix the message with a file | |
| 476 * name in quotes. In the exception value, put the file name in | |
| 477 * parentheses and move it to the end. */ | |
| 478 for (p = mesg; ; p++) | |
| 479 { | |
| 480 if (*p == NUL | |
| 481 || (*p == 'E' | |
| 482 && VIM_ISDIGIT(p[1]) | |
| 483 && (p[2] == ':' | |
| 484 || (VIM_ISDIGIT(p[2]) | |
| 485 && (p[3] == ':' | |
| 486 || (VIM_ISDIGIT(p[3]) | |
| 487 && p[4] == ':')))))) | |
| 488 { | |
| 273 | 489 if (*p == NUL || p == mesg) |
| 490 STRCAT(val, mesg); /* 'E123' missing or at beginning */ | |
| 7 | 491 else |
| 492 { | |
| 493 /* '"filename" E123: message text' */ | |
| 494 if (mesg[0] != '"' || p-2 < &mesg[1] || | |
| 495 p[-2] != '"' || p[-1] != ' ') | |
| 496 /* "E123:" is part of the file name. */ | |
| 497 continue; | |
| 498 | |
| 499 STRCAT(val, p); | |
| 500 p[-2] = NUL; | |
| 501 sprintf((char *)(val + STRLEN(p)), " (%s)", &mesg[1]); | |
| 502 p[-2] = '"'; | |
| 503 } | |
| 504 break; | |
| 505 } | |
| 506 } | |
| 507 } | |
| 508 else | |
| 509 excp->value = value; | |
| 510 | |
| 511 excp->type = type; | |
| 512 excp->throw_name = vim_strsave(sourcing_name == NULL | |
| 513 ? (char_u *)"" : sourcing_name); | |
| 514 if (excp->throw_name == NULL) | |
| 515 { | |
| 516 if (type == ET_ERROR) | |
| 517 vim_free(excp->value); | |
| 518 goto nomem; | |
| 519 } | |
| 520 excp->throw_lnum = sourcing_lnum; | |
| 521 | |
| 522 if (p_verbose >= 13 || debug_break_level > 0) | |
| 523 { | |
| 524 int save_msg_silent = msg_silent; | |
| 525 | |
| 526 if (debug_break_level > 0) | |
| 527 msg_silent = FALSE; /* display messages */ | |
| 293 | 528 else |
| 529 verbose_enter(); | |
| 7 | 530 ++no_wait_return; |
| 293 | 531 if (debug_break_level > 0 || *p_vfile == NUL) |
| 532 msg_scroll = TRUE; /* always scroll up, don't overwrite */ | |
| 533 | |
| 273 | 534 smsg((char_u *)_("Exception thrown: %s"), excp->value); |
| 7 | 535 msg_puts((char_u *)"\n"); /* don't overwrite this either */ |
| 293 | 536 |
| 537 if (debug_break_level > 0 || *p_vfile == NUL) | |
| 538 cmdline_row = msg_row; | |
| 7 | 539 --no_wait_return; |
| 540 if (debug_break_level > 0) | |
| 541 msg_silent = save_msg_silent; | |
| 293 | 542 else |
| 543 verbose_leave(); | |
| 7 | 544 } |
| 545 | |
| 546 current_exception = excp; | |
| 547 return OK; | |
| 548 | |
| 549 nomem: | |
| 550 vim_free(excp); | |
| 551 suppress_errthrow = TRUE; | |
| 552 EMSG(_(e_outofmem)); | |
| 553 fail: | |
| 554 current_exception = NULL; | |
| 555 return FAIL; | |
| 556 } | |
| 557 | |
| 558 /* | |
| 559 * Discard an exception. "was_finished" is set when the exception has been | |
| 560 * caught and the catch clause has been ended normally. | |
| 561 */ | |
| 562 static void | |
| 563 discard_exception(excp, was_finished) | |
| 564 except_T *excp; | |
| 565 int was_finished; | |
| 566 { | |
| 567 char_u *saved_IObuff; | |
| 568 | |
| 569 if (excp == NULL) | |
| 570 { | |
| 571 EMSG(_(e_internal)); | |
| 572 return; | |
| 573 } | |
| 574 | |
| 575 if (p_verbose >= 13 || debug_break_level > 0) | |
| 576 { | |
| 577 int save_msg_silent = msg_silent; | |
| 578 | |
| 579 saved_IObuff = vim_strsave(IObuff); | |
| 580 if (debug_break_level > 0) | |
| 581 msg_silent = FALSE; /* display messages */ | |
| 293 | 582 else |
| 583 verbose_enter(); | |
| 7 | 584 ++no_wait_return; |
| 293 | 585 if (debug_break_level > 0 || *p_vfile == NUL) |
| 586 msg_scroll = TRUE; /* always scroll up, don't overwrite */ | |
| 273 | 587 smsg(was_finished |
| 7 | 588 ? (char_u *)_("Exception finished: %s") |
| 589 : (char_u *)_("Exception discarded: %s"), | |
| 590 excp->value); | |
| 591 msg_puts((char_u *)"\n"); /* don't overwrite this either */ | |
| 293 | 592 if (debug_break_level > 0 || *p_vfile == NUL) |
| 593 cmdline_row = msg_row; | |
| 7 | 594 --no_wait_return; |
| 595 if (debug_break_level > 0) | |
| 596 msg_silent = save_msg_silent; | |
| 293 | 597 else |
| 598 verbose_leave(); | |
| 7 | 599 STRCPY(IObuff, saved_IObuff); |
| 600 vim_free(saved_IObuff); | |
| 601 } | |
| 602 if (excp->type != ET_INTERRUPT) | |
| 603 vim_free(excp->value); | |
| 604 if (excp->type == ET_ERROR) | |
| 605 free_msglist(excp->messages); | |
| 606 vim_free(excp->throw_name); | |
| 607 vim_free(excp); | |
| 608 } | |
| 609 | |
| 610 /* | |
| 611 * Discard the exception currently being thrown. | |
| 612 */ | |
| 613 void | |
| 614 discard_current_exception() | |
| 615 { | |
| 616 discard_exception(current_exception, FALSE); | |
| 617 current_exception = NULL; | |
| 618 did_throw = FALSE; | |
| 619 need_rethrow = FALSE; | |
| 620 } | |
| 621 | |
| 622 /* | |
| 623 * Put an exception on the caught stack. | |
| 624 */ | |
| 625 static void | |
| 626 catch_exception(excp) | |
| 627 except_T *excp; | |
| 628 { | |
| 629 excp->caught = caught_stack; | |
| 630 caught_stack = excp; | |
| 631 set_vim_var_string(VV_EXCEPTION, excp->value, -1); | |
| 632 if (*excp->throw_name != NUL) | |
| 633 { | |
| 634 if (excp->throw_lnum != 0) | |
| 273 | 635 vim_snprintf((char *)IObuff, IOSIZE, _("%s, line %ld"), |
| 636 excp->throw_name, (long)excp->throw_lnum); | |
| 7 | 637 else |
| 273 | 638 vim_snprintf((char *)IObuff, IOSIZE, "%s", excp->throw_name); |
| 7 | 639 set_vim_var_string(VV_THROWPOINT, IObuff, -1); |
| 640 } | |
| 641 else | |
| 642 /* throw_name not set on an exception from a command that was typed. */ | |
| 643 set_vim_var_string(VV_THROWPOINT, NULL, -1); | |
| 644 | |
| 645 if (p_verbose >= 13 || debug_break_level > 0) | |
| 646 { | |
| 647 int save_msg_silent = msg_silent; | |
| 648 | |
| 649 if (debug_break_level > 0) | |
| 650 msg_silent = FALSE; /* display messages */ | |
| 293 | 651 else |
| 652 verbose_enter(); | |
| 7 | 653 ++no_wait_return; |
| 293 | 654 if (debug_break_level > 0 || *p_vfile == NUL) |
| 655 msg_scroll = TRUE; /* always scroll up, don't overwrite */ | |
| 656 | |
| 273 | 657 smsg((char_u *)_("Exception caught: %s"), excp->value); |
| 7 | 658 msg_puts((char_u *)"\n"); /* don't overwrite this either */ |
| 293 | 659 |
| 660 if (debug_break_level > 0 || *p_vfile == NUL) | |
| 661 cmdline_row = msg_row; | |
| 7 | 662 --no_wait_return; |
| 663 if (debug_break_level > 0) | |
| 664 msg_silent = save_msg_silent; | |
| 293 | 665 else |
| 666 verbose_leave(); | |
| 7 | 667 } |
| 668 } | |
| 669 | |
| 670 /* | |
| 671 * Remove an exception from the caught stack. | |
| 672 */ | |
| 673 static void | |
| 674 finish_exception(excp) | |
| 675 except_T *excp; | |
| 676 { | |
| 677 if (excp != caught_stack) | |
| 678 EMSG(_(e_internal)); | |
| 679 caught_stack = caught_stack->caught; | |
| 680 if (caught_stack != NULL) | |
| 681 { | |
| 682 set_vim_var_string(VV_EXCEPTION, caught_stack->value, -1); | |
| 683 if (*caught_stack->throw_name != NUL) | |
| 684 { | |
| 685 if (caught_stack->throw_lnum != 0) | |
| 273 | 686 vim_snprintf((char *)IObuff, IOSIZE, |
| 7 | 687 _("%s, line %ld"), caught_stack->throw_name, |
| 688 (long)caught_stack->throw_lnum); | |
| 689 else | |
| 273 | 690 vim_snprintf((char *)IObuff, IOSIZE, "%s", |
| 691 caught_stack->throw_name); | |
| 7 | 692 set_vim_var_string(VV_THROWPOINT, IObuff, -1); |
| 693 } | |
| 694 else | |
| 695 /* throw_name not set on an exception from a command that was | |
| 696 * typed. */ | |
| 697 set_vim_var_string(VV_THROWPOINT, NULL, -1); | |
| 698 } | |
| 699 else | |
| 700 { | |
| 701 set_vim_var_string(VV_EXCEPTION, NULL, -1); | |
| 702 set_vim_var_string(VV_THROWPOINT, NULL, -1); | |
| 703 } | |
| 704 | |
| 705 /* Discard the exception, but use the finish message for 'verbose'. */ | |
| 706 discard_exception(excp, TRUE); | |
| 707 } | |
| 708 | |
| 709 /* | |
| 710 * Flags specifying the message displayed by report_pending. | |
| 711 */ | |
| 712 #define RP_MAKE 0 | |
| 713 #define RP_RESUME 1 | |
| 714 #define RP_DISCARD 2 | |
| 715 | |
| 716 /* | |
| 717 * Report information about something pending in a finally clause if required by | |
| 718 * the 'verbose' option or when debugging. "action" tells whether something is | |
| 719 * made pending or something pending is resumed or discarded. "pending" tells | |
| 720 * what is pending. "value" specifies the return value for a pending ":return" | |
| 721 * or the exception value for a pending exception. | |
| 722 */ | |
| 723 static void | |
| 724 report_pending(action, pending, value) | |
| 725 int action; | |
| 726 int pending; | |
| 727 void *value; | |
| 728 { | |
| 729 char_u *mesg; | |
| 730 char *s; | |
| 731 int save_msg_silent; | |
| 732 | |
| 733 | |
| 734 switch (action) | |
| 735 { | |
| 736 case RP_MAKE: | |
| 737 mesg = (char_u *)_("%s made pending"); | |
| 738 break; | |
| 739 case RP_RESUME: | |
| 740 mesg = (char_u *)_("%s resumed"); | |
| 741 break; | |
| 742 /* case RP_DISCARD: */ | |
| 743 default: | |
| 744 mesg = (char_u *)_("%s discarded"); | |
| 745 break; | |
| 746 } | |
| 747 | |
| 748 switch (pending) | |
| 749 { | |
| 750 case CSTP_NONE: | |
| 751 return; | |
| 752 | |
| 753 case CSTP_CONTINUE: | |
| 754 s = ":continue"; | |
| 755 break; | |
| 756 case CSTP_BREAK: | |
| 757 s = ":break"; | |
| 758 break; | |
| 759 case CSTP_FINISH: | |
| 760 s = ":finish"; | |
| 761 break; | |
| 762 case CSTP_RETURN: | |
| 763 /* ":return" command producing value, allocated */ | |
| 764 s = (char *)get_return_cmd(value); | |
| 765 break; | |
| 766 | |
| 767 default: | |
| 768 if (pending & CSTP_THROW) | |
| 769 { | |
| 273 | 770 vim_snprintf((char *)IObuff, IOSIZE, |
| 771 (char *)mesg, _("Exception")); | |
| 7 | 772 mesg = vim_strnsave(IObuff, (int)STRLEN(IObuff) + 4); |
| 773 STRCAT(mesg, ": %s"); | |
| 774 s = (char *)((except_T *)value)->value; | |
| 775 } | |
| 776 else if ((pending & CSTP_ERROR) && (pending & CSTP_INTERRUPT)) | |
| 777 s = _("Error and interrupt"); | |
| 778 else if (pending & CSTP_ERROR) | |
| 779 s = _("Error"); | |
| 780 else /* if (pending & CSTP_INTERRUPT) */ | |
| 781 s = _("Interrupt"); | |
| 782 } | |
| 783 | |
| 784 save_msg_silent = msg_silent; | |
| 785 if (debug_break_level > 0) | |
| 786 msg_silent = FALSE; /* display messages */ | |
| 787 ++no_wait_return; | |
| 788 msg_scroll = TRUE; /* always scroll up, don't overwrite */ | |
| 273 | 789 smsg(mesg, (char_u *)s); |
| 7 | 790 msg_puts((char_u *)"\n"); /* don't overwrite this either */ |
| 791 cmdline_row = msg_row; | |
| 792 --no_wait_return; | |
| 793 if (debug_break_level > 0) | |
| 794 msg_silent = save_msg_silent; | |
| 795 | |
| 796 if (pending == CSTP_RETURN) | |
| 797 vim_free(s); | |
| 798 else if (pending & CSTP_THROW) | |
| 799 vim_free(mesg); | |
| 800 } | |
| 801 | |
| 802 /* | |
| 803 * If something is made pending in a finally clause, report it if required by | |
| 804 * the 'verbose' option or when debugging. | |
| 805 */ | |
| 806 void | |
| 807 report_make_pending(pending, value) | |
| 808 int pending; | |
| 809 void *value; | |
| 810 { | |
| 811 if (p_verbose >= 14 || debug_break_level > 0) | |
| 293 | 812 { |
| 813 if (debug_break_level <= 0) | |
| 814 verbose_enter(); | |
| 7 | 815 report_pending(RP_MAKE, pending, value); |
| 293 | 816 if (debug_break_level <= 0) |
| 817 verbose_leave(); | |
| 818 } | |
| 7 | 819 } |
| 820 | |
| 821 /* | |
| 822 * If something pending in a finally clause is resumed at the ":endtry", report | |
| 823 * it if required by the 'verbose' option or when debugging. | |
| 824 */ | |
| 825 void | |
| 826 report_resume_pending(pending, value) | |
| 827 int pending; | |
| 828 void *value; | |
| 829 { | |
| 830 if (p_verbose >= 14 || debug_break_level > 0) | |
| 293 | 831 { |
| 832 if (debug_break_level <= 0) | |
| 833 verbose_enter(); | |
| 7 | 834 report_pending(RP_RESUME, pending, value); |
| 293 | 835 if (debug_break_level <= 0) |
| 836 verbose_leave(); | |
| 837 } | |
| 7 | 838 } |
| 839 | |
| 840 /* | |
| 841 * If something pending in a finally clause is discarded, report it if required | |
| 842 * by the 'verbose' option or when debugging. | |
| 843 */ | |
| 844 void | |
| 845 report_discard_pending(pending, value) | |
| 846 int pending; | |
| 847 void *value; | |
| 848 { | |
| 849 if (p_verbose >= 14 || debug_break_level > 0) | |
| 293 | 850 { |
| 851 if (debug_break_level <= 0) | |
| 852 verbose_enter(); | |
| 7 | 853 report_pending(RP_DISCARD, pending, value); |
| 293 | 854 if (debug_break_level <= 0) |
| 855 verbose_leave(); | |
| 856 } | |
| 7 | 857 } |
| 858 | |
| 859 | |
| 860 /* | |
| 861 * ":if". | |
| 862 */ | |
| 863 void | |
| 864 ex_if(eap) | |
| 865 exarg_T *eap; | |
| 866 { | |
| 867 int error; | |
| 868 int skip; | |
| 869 int result; | |
| 870 struct condstack *cstack = eap->cstack; | |
| 871 | |
| 872 if (cstack->cs_idx == CSTACK_LEN - 1) | |
| 873 eap->errmsg = (char_u *)N_("E579: :if nesting too deep"); | |
| 874 else | |
| 875 { | |
| 876 ++cstack->cs_idx; | |
| 877 cstack->cs_flags[cstack->cs_idx] = 0; | |
| 878 | |
| 879 /* | |
| 880 * Don't do something after an error, interrupt, or throw, or when there | |
| 881 * is a surrounding conditional and it was not active. | |
| 882 */ | |
| 883 skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0 | |
| 884 && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE)); | |
| 885 | |
| 886 result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip); | |
| 887 | |
| 888 if (!skip && !error) | |
| 889 { | |
| 890 if (result) | |
| 891 cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE | CSF_TRUE; | |
| 892 } | |
| 893 else | |
| 894 /* set TRUE, so this conditional will never get active */ | |
| 895 cstack->cs_flags[cstack->cs_idx] = CSF_TRUE; | |
| 896 } | |
| 897 } | |
| 898 | |
| 899 /* | |
| 900 * ":endif". | |
| 901 */ | |
| 902 void | |
| 903 ex_endif(eap) | |
| 904 exarg_T *eap; | |
| 905 { | |
| 906 did_endif = TRUE; | |
| 907 if (eap->cstack->cs_idx < 0 | |
| 79 | 908 || (eap->cstack->cs_flags[eap->cstack->cs_idx] |
| 909 & (CSF_WHILE | CSF_FOR | CSF_TRY))) | |
| 7 | 910 eap->errmsg = (char_u *)N_("E580: :endif without :if"); |
| 911 else | |
| 912 { | |
| 913 /* | |
| 914 * When debugging or a breakpoint was encountered, display the debug | |
| 915 * prompt (if not already done). This shows the user that an ":endif" | |
| 916 * is executed when the ":if" or a previous ":elseif" was not TRUE. | |
| 917 * Handle a ">quit" debug command as if an interrupt had occurred before | |
| 918 * the ":endif". That is, throw an interrupt exception if appropriate. | |
| 919 * Doing this here prevents an exception for a parsing error being | |
| 920 * discarded by throwing the interrupt exception later on. | |
| 921 */ | |
| 359 | 922 if (!(eap->cstack->cs_flags[eap->cstack->cs_idx] & CSF_TRUE) |
| 923 && dbg_check_skipped(eap)) | |
| 7 | 924 (void)do_intthrow(eap->cstack); |
| 925 | |
| 926 --eap->cstack->cs_idx; | |
| 927 } | |
| 928 } | |
| 929 | |
| 930 /* | |
| 931 * ":else" and ":elseif". | |
| 932 */ | |
| 933 void | |
| 934 ex_else(eap) | |
| 935 exarg_T *eap; | |
| 936 { | |
| 937 int error; | |
| 938 int skip; | |
| 939 int result; | |
| 940 struct condstack *cstack = eap->cstack; | |
| 941 | |
| 942 /* | |
| 943 * Don't do something after an error, interrupt, or throw, or when there is | |
| 944 * a surrounding conditional and it was not active. | |
| 945 */ | |
| 946 skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0 | |
| 947 && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE)); | |
| 948 | |
| 949 if (cstack->cs_idx < 0 | |
| 75 | 950 || (cstack->cs_flags[cstack->cs_idx] |
| 951 & (CSF_WHILE | CSF_FOR | CSF_TRY))) | |
| 7 | 952 { |
| 953 if (eap->cmdidx == CMD_else) | |
| 954 { | |
| 955 eap->errmsg = (char_u *)N_("E581: :else without :if"); | |
| 956 return; | |
| 957 } | |
| 958 eap->errmsg = (char_u *)N_("E582: :elseif without :if"); | |
| 959 skip = TRUE; | |
| 960 } | |
| 961 else if (cstack->cs_flags[cstack->cs_idx] & CSF_ELSE) | |
| 962 { | |
| 963 if (eap->cmdidx == CMD_else) | |
| 964 { | |
| 965 eap->errmsg = (char_u *)N_("E583: multiple :else"); | |
| 966 return; | |
| 967 } | |
| 968 eap->errmsg = (char_u *)N_("E584: :elseif after :else"); | |
| 969 skip = TRUE; | |
| 970 } | |
| 971 | |
| 972 /* if skipping or the ":if" was TRUE, reset ACTIVE, otherwise set it */ | |
| 973 if (skip || cstack->cs_flags[cstack->cs_idx] & CSF_TRUE) | |
| 974 { | |
| 975 if (eap->errmsg == NULL) | |
| 976 cstack->cs_flags[cstack->cs_idx] = CSF_TRUE; | |
| 977 skip = TRUE; /* don't evaluate an ":elseif" */ | |
| 978 } | |
| 979 else | |
| 980 cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE; | |
| 981 | |
| 982 /* | |
| 983 * When debugging or a breakpoint was encountered, display the debug prompt | |
| 984 * (if not already done). This shows the user that an ":else" or ":elseif" | |
| 985 * is executed when the ":if" or previous ":elseif" was not TRUE. Handle | |
| 986 * a ">quit" debug command as if an interrupt had occurred before the | |
| 987 * ":else" or ":elseif". That is, set "skip" and throw an interrupt | |
| 988 * exception if appropriate. Doing this here prevents that an exception | |
| 989 * for a parsing errors is discarded when throwing the interrupt exception | |
| 990 * later on. | |
| 991 */ | |
| 992 if (!skip && dbg_check_skipped(eap) && got_int) | |
| 993 { | |
| 994 (void)do_intthrow(cstack); | |
| 995 skip = TRUE; | |
| 996 } | |
| 997 | |
| 998 if (eap->cmdidx == CMD_elseif) | |
| 999 { | |
| 1000 result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip); | |
| 1001 /* When throwing error exceptions, we want to throw always the first | |
| 1002 * of several errors in a row. This is what actually happens when | |
| 1003 * a conditional error was detected above and there is another failure | |
| 1004 * when parsing the expression. Since the skip flag is set in this | |
| 1005 * case, the parsing error will be ignored by emsg(). */ | |
| 1006 | |
| 1007 if (!skip && !error) | |
| 1008 { | |
| 1009 if (result) | |
| 1010 cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE | CSF_TRUE; | |
| 1011 else | |
| 1012 cstack->cs_flags[cstack->cs_idx] = 0; | |
| 1013 } | |
| 1014 else if (eap->errmsg == NULL) | |
| 1015 /* set TRUE, so this conditional will never get active */ | |
| 1016 cstack->cs_flags[cstack->cs_idx] = CSF_TRUE; | |
| 1017 } | |
| 1018 else | |
| 1019 cstack->cs_flags[cstack->cs_idx] |= CSF_ELSE; | |
| 1020 } | |
| 1021 | |
| 1022 /* | |
| 75 | 1023 * Handle ":while" and ":for". |
| 7 | 1024 */ |
| 1025 void | |
| 1026 ex_while(eap) | |
| 1027 exarg_T *eap; | |
| 1028 { | |
| 1029 int error; | |
| 1030 int skip; | |
| 1031 int result; | |
| 1032 struct condstack *cstack = eap->cstack; | |
| 1033 | |
| 1034 if (cstack->cs_idx == CSTACK_LEN - 1) | |
| 75 | 1035 eap->errmsg = (char_u *)N_("E585: :while/:for nesting too deep"); |
| 7 | 1036 else |
| 1037 { | |
| 1038 /* | |
| 75 | 1039 * The loop flag is set when we have jumped back from the matching |
| 1040 * ":endwhile" or ":endfor". When not set, need to initialise this | |
| 1041 * cstack entry. | |
| 7 | 1042 */ |
| 75 | 1043 if ((cstack->cs_lflags & CSL_HAD_LOOP) == 0) |
| 7 | 1044 { |
| 1045 ++cstack->cs_idx; | |
| 75 | 1046 ++cstack->cs_looplevel; |
| 7 | 1047 cstack->cs_line[cstack->cs_idx] = -1; |
| 1048 } | |
| 75 | 1049 cstack->cs_flags[cstack->cs_idx] = |
| 1050 eap->cmdidx == CMD_while ? CSF_WHILE : CSF_FOR; | |
| 7 | 1051 |
| 1052 /* | |
| 75 | 1053 * Don't do something after an error, interrupt, or throw, or when |
| 1054 * there is a surrounding conditional and it was not active. | |
| 7 | 1055 */ |
| 1056 skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0 | |
| 1057 && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE)); | |
| 75 | 1058 if (eap->cmdidx == CMD_while) |
| 1059 { | |
| 1060 /* | |
| 1061 * ":while bool-expr" | |
| 1062 */ | |
| 1063 result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip); | |
| 1064 } | |
| 1065 else | |
| 1066 { | |
| 1067 void *fi; | |
| 1068 | |
| 1069 /* | |
| 1070 * ":for var in list-expr" | |
| 1071 */ | |
| 1072 if ((cstack->cs_lflags & CSL_HAD_LOOP) != 0) | |
| 1073 { | |
| 1074 /* Jumping here from a ":continue" or ":endfor": use the | |
| 1075 * previously evaluated list. */ | |
| 79 | 1076 fi = cstack->cs_forinfo[cstack->cs_idx]; |
| 75 | 1077 error = FALSE; |
| 1078 } | |
| 1079 else | |
| 1080 { | |
| 1081 /* Evaluate the argument and get the info in a structure. */ | |
| 1082 fi = eval_for_line(eap->arg, &error, &eap->nextcmd, skip); | |
| 79 | 1083 cstack->cs_forinfo[cstack->cs_idx] = fi; |
| 75 | 1084 } |
| 1085 | |
| 1086 /* use the element at the start of the list and advance */ | |
| 1087 if (!error && fi != NULL && !skip) | |
| 1088 result = next_for_item(fi, eap->arg); | |
| 1089 else | |
| 1090 result = FALSE; | |
| 1091 | |
| 1092 if (!result) | |
| 1093 { | |
| 1094 free_for_info(fi); | |
| 79 | 1095 cstack->cs_forinfo[cstack->cs_idx] = NULL; |
| 75 | 1096 } |
| 1097 } | |
| 7 | 1098 |
| 1099 /* | |
| 75 | 1100 * If this cstack entry was just initialised and is active, set the |
| 1101 * loop flag, so do_cmdline() will set the line number in cs_line[]. | |
| 1102 * If executing the command a second time, clear the loop flag. | |
| 7 | 1103 */ |
| 1104 if (!skip && !error && result) | |
| 1105 { | |
| 75 | 1106 cstack->cs_flags[cstack->cs_idx] |= (CSF_ACTIVE | CSF_TRUE); |
| 1107 cstack->cs_lflags ^= CSL_HAD_LOOP; | |
| 7 | 1108 } |
| 1109 else | |
| 1110 { | |
| 75 | 1111 cstack->cs_lflags &= ~CSL_HAD_LOOP; |
| 1112 /* If the ":while" evaluates to FALSE or ":for" is past the end of | |
| 1113 * the list, show the debug prompt at the ":endwhile"/":endfor" as | |
| 1114 * if there was a ":break" in a ":while"/":for" evaluating to | |
| 1115 * TRUE. */ | |
| 7 | 1116 if (!skip && !error) |
| 1117 cstack->cs_flags[cstack->cs_idx] |= CSF_TRUE; | |
| 1118 } | |
| 1119 } | |
| 1120 } | |
| 1121 | |
| 1122 /* | |
| 1123 * ":continue" | |
| 1124 */ | |
| 1125 void | |
| 1126 ex_continue(eap) | |
| 1127 exarg_T *eap; | |
| 1128 { | |
| 1129 int idx; | |
| 1130 struct condstack *cstack = eap->cstack; | |
| 1131 | |
| 75 | 1132 if (cstack->cs_looplevel <= 0 || cstack->cs_idx < 0) |
| 1133 eap->errmsg = (char_u *)N_("E586: :continue without :while or :for"); | |
| 7 | 1134 else |
| 1135 { | |
| 1136 /* Try to find the matching ":while". This might stop at a try | |
| 1137 * conditional not in its finally clause (which is then to be executed | |
| 1138 * next). Therefor, inactivate all conditionals except the ":while" | |
| 1139 * itself (if reached). */ | |
| 75 | 1140 idx = cleanup_conditionals(cstack, CSF_WHILE | CSF_FOR, FALSE); |
| 840 | 1141 if (idx >= 0 && (cstack->cs_flags[idx] & (CSF_WHILE | CSF_FOR))) |
| 7 | 1142 { |
| 79 | 1143 rewind_conditionals(cstack, idx, CSF_TRY, &cstack->cs_trylevel); |
| 7 | 1144 |
| 1145 /* | |
| 75 | 1146 * Set CSL_HAD_CONT, so do_cmdline() will jump back to the |
| 7 | 1147 * matching ":while". |
| 1148 */ | |
| 75 | 1149 cstack->cs_lflags |= CSL_HAD_CONT; /* let do_cmdline() handle it */ |
| 7 | 1150 } |
| 1151 else | |
| 1152 { | |
| 1153 /* If a try conditional not in its finally clause is reached first, | |
| 1154 * make the ":continue" pending for execution at the ":endtry". */ | |
| 1155 cstack->cs_pending[idx] = CSTP_CONTINUE; | |
| 1156 report_make_pending(CSTP_CONTINUE, NULL); | |
| 1157 } | |
| 1158 } | |
| 1159 } | |
| 1160 | |
| 1161 /* | |
| 1162 * ":break" | |
| 1163 */ | |
| 1164 void | |
| 1165 ex_break(eap) | |
| 1166 exarg_T *eap; | |
| 1167 { | |
| 1168 int idx; | |
| 1169 struct condstack *cstack = eap->cstack; | |
| 1170 | |
| 75 | 1171 if (cstack->cs_looplevel <= 0 || cstack->cs_idx < 0) |
| 1172 eap->errmsg = (char_u *)N_("E587: :break without :while or :for"); | |
| 7 | 1173 else |
| 1174 { | |
| 1175 /* Inactivate conditionals until the matching ":while" or a try | |
| 1176 * conditional not in its finally clause (which is then to be | |
| 1177 * executed next) is found. In the latter case, make the ":break" | |
| 1178 * pending for execution at the ":endtry". */ | |
| 75 | 1179 idx = cleanup_conditionals(cstack, CSF_WHILE | CSF_FOR, TRUE); |
| 840 | 1180 if (idx >= 0 && !(cstack->cs_flags[idx] & (CSF_WHILE | CSF_FOR))) |
| 7 | 1181 { |
| 1182 cstack->cs_pending[idx] = CSTP_BREAK; | |
| 1183 report_make_pending(CSTP_BREAK, NULL); | |
| 1184 } | |
| 1185 } | |
| 1186 } | |
| 1187 | |
| 1188 /* | |
| 75 | 1189 * ":endwhile" and ":endfor" |
| 7 | 1190 */ |
| 1191 void | |
| 1192 ex_endwhile(eap) | |
| 1193 exarg_T *eap; | |
| 1194 { | |
| 1195 struct condstack *cstack = eap->cstack; | |
| 75 | 1196 int idx; |
| 1197 char_u *err; | |
| 1198 int csf; | |
| 1199 int fl; | |
| 7 | 1200 |
| 75 | 1201 if (eap->cmdidx == CMD_endwhile) |
| 1202 { | |
| 1203 err = e_while; | |
| 1204 csf = CSF_WHILE; | |
| 1205 } | |
| 1206 else | |
| 1207 { | |
| 1208 err = e_for; | |
| 1209 csf = CSF_FOR; | |
| 1210 } | |
| 1211 | |
| 1212 if (cstack->cs_looplevel <= 0 || cstack->cs_idx < 0) | |
| 1213 eap->errmsg = err; | |
| 7 | 1214 else |
| 1215 { | |
| 75 | 1216 fl = cstack->cs_flags[cstack->cs_idx]; |
| 1217 if (!(fl & csf)) | |
| 7 | 1218 { |
| 114 | 1219 /* If we are in a ":while" or ":for" but used the wrong endloop |
| 1220 * command, do not rewind to the next enclosing ":for"/":while". */ | |
| 75 | 1221 if (fl & CSF_WHILE) |
| 114 | 1222 eap->errmsg = (char_u *)_("E732: Using :endfor with :while"); |
| 75 | 1223 else if (fl & CSF_FOR) |
| 114 | 1224 eap->errmsg = (char_u *)_("E733: Using :endwhile with :for"); |
| 1225 } | |
| 1226 if (!(fl & (CSF_WHILE | CSF_FOR))) | |
| 1227 { | |
| 1228 if (!(fl & CSF_TRY)) | |
| 75 | 1229 eap->errmsg = e_endif; |
| 1230 else if (fl & CSF_FINALLY) | |
| 1231 eap->errmsg = e_endtry; | |
| 7 | 1232 /* Try to find the matching ":while" and report what's missing. */ |
| 1233 for (idx = cstack->cs_idx; idx > 0; --idx) | |
| 1234 { | |
| 75 | 1235 fl = cstack->cs_flags[idx]; |
| 1236 if ((fl & CSF_TRY) && !(fl & CSF_FINALLY)) | |
| 7 | 1237 { |
| 1238 /* Give up at a try conditional not in its finally clause. | |
| 75 | 1239 * Ignore the ":endwhile"/":endfor". */ |
| 1240 eap->errmsg = err; | |
| 7 | 1241 return; |
| 1242 } | |
| 75 | 1243 if (fl & csf) |
| 7 | 1244 break; |
| 1245 } | |
| 1246 /* Cleanup and rewind all contained (and unclosed) conditionals. */ | |
| 75 | 1247 (void)cleanup_conditionals(cstack, CSF_WHILE | CSF_FOR, FALSE); |
| 7 | 1248 rewind_conditionals(cstack, idx, CSF_TRY, &cstack->cs_trylevel); |
| 1249 } | |
| 1250 | |
| 1251 /* | |
| 1252 * When debugging or a breakpoint was encountered, display the debug | |
| 1253 * prompt (if not already done). This shows the user that an | |
| 75 | 1254 * ":endwhile"/":endfor" is executed when the ":while" was not TRUE or |
| 1255 * after a ":break". Handle a ">quit" debug command as if an | |
| 1256 * interrupt had occurred before the ":endwhile"/":endfor". That is, | |
| 1257 * throw an interrupt exception if appropriate. Doing this here | |
| 1258 * prevents that an exception for a parsing error is discarded when | |
| 1259 * throwing the interrupt exception later on. | |
| 7 | 1260 */ |
| 1261 else if (cstack->cs_flags[cstack->cs_idx] & CSF_TRUE | |
| 1262 && !(cstack->cs_flags[cstack->cs_idx] & CSF_ACTIVE) | |
| 1263 && dbg_check_skipped(eap)) | |
| 1264 (void)do_intthrow(cstack); | |
| 1265 | |
| 1266 /* | |
| 75 | 1267 * Set loop flag, so do_cmdline() will jump back to the matching |
| 1268 * ":while" or ":for". | |
| 7 | 1269 */ |
| 75 | 1270 cstack->cs_lflags |= CSL_HAD_ENDLOOP; |
| 7 | 1271 } |
| 1272 } | |
| 1273 | |
| 1274 | |
| 1275 /* | |
| 1276 * ":throw expr" | |
| 1277 */ | |
| 1278 void | |
| 1279 ex_throw(eap) | |
| 1280 exarg_T *eap; | |
| 1281 { | |
| 1282 char_u *arg = eap->arg; | |
| 1283 char_u *value; | |
| 1284 | |
| 1285 if (*arg != NUL && *arg != '|' && *arg != '\n') | |
| 1286 value = eval_to_string_skip(arg, &eap->nextcmd, eap->skip); | |
| 1287 else | |
| 1288 { | |
| 1289 EMSG(_(e_argreq)); | |
| 1290 value = NULL; | |
| 1291 } | |
| 1292 | |
| 1293 /* On error or when an exception is thrown during argument evaluation, do | |
| 1294 * not throw. */ | |
| 1295 if (!eap->skip && value != NULL) | |
| 1296 { | |
| 1297 if (throw_exception(value, ET_USER, NULL) == FAIL) | |
| 1298 vim_free(value); | |
| 1299 else | |
| 1300 do_throw(eap->cstack); | |
| 1301 } | |
| 1302 } | |
| 1303 | |
| 1304 /* | |
| 21 | 1305 * Throw the current exception through the specified cstack. Common routine |
| 1306 * for ":throw" (user exception) and error and interrupt exceptions. Also | |
| 1307 * used for rethrowing an uncaught exception. | |
| 7 | 1308 */ |
| 1309 void | |
| 1310 do_throw(cstack) | |
| 1311 struct condstack *cstack; | |
| 1312 { | |
| 1313 int idx; | |
| 1314 int inactivate_try = FALSE; | |
| 1315 | |
| 1316 /* | |
| 1317 * Cleanup and inactivate up to the next surrounding try conditional that | |
| 1318 * is not in its finally clause. Normally, do not inactivate the try | |
| 1319 * conditional itself, so that its ACTIVE flag can be tested below. But | |
| 1320 * if a previous error or interrupt has not been converted to an exception, | |
| 1321 * inactivate the try conditional, too, as if the conversion had been done, | |
| 21 | 1322 * and reset the did_emsg or got_int flag, so this won't happen again at |
| 1323 * the next surrounding try conditional. | |
| 7 | 1324 */ |
| 1880 | 1325 #ifndef THROW_ON_ERROR_TRUE |
| 7 | 1326 if (did_emsg && !THROW_ON_ERROR) |
| 1327 { | |
| 1328 inactivate_try = TRUE; | |
| 1329 did_emsg = FALSE; | |
| 1330 } | |
| 1880 | 1331 #endif |
| 1332 #ifndef THROW_ON_INTERRUPT_TRUE | |
| 7 | 1333 if (got_int && !THROW_ON_INTERRUPT) |
| 1334 { | |
| 1335 inactivate_try = TRUE; | |
| 1336 got_int = FALSE; | |
| 1337 } | |
| 1880 | 1338 #endif |
| 7 | 1339 idx = cleanup_conditionals(cstack, 0, inactivate_try); |
| 1340 if (idx >= 0) | |
| 1341 { | |
| 1342 /* | |
| 1343 * If this try conditional is active and we are before its first | |
| 21 | 1344 * ":catch", set THROWN so that the ":catch" commands will check |
| 1345 * whether the exception matches. When the exception came from any of | |
| 1346 * the catch clauses, it will be made pending at the ":finally" (if | |
| 1347 * present) and rethrown at the ":endtry". This will also happen if | |
| 1348 * the try conditional is inactive. This is the case when we are | |
| 1349 * throwing an exception due to an error or interrupt on the way from | |
| 1350 * a preceding ":continue", ":break", ":return", ":finish", error or | |
| 1351 * interrupt (not converted to an exception) to the finally clause or | |
| 1352 * from a preceding throw of a user or error or interrupt exception to | |
| 1353 * the matching catch clause or the finally clause. | |
| 7 | 1354 */ |
| 1355 if (!(cstack->cs_flags[idx] & CSF_CAUGHT)) | |
| 1356 { | |
| 1357 if (cstack->cs_flags[idx] & CSF_ACTIVE) | |
| 1358 cstack->cs_flags[idx] |= CSF_THROWN; | |
| 1359 else | |
| 1360 /* THROWN may have already been set for a catchable exception | |
| 1361 * that has been discarded. Ensure it is reset for the new | |
| 1362 * exception. */ | |
| 1363 cstack->cs_flags[idx] &= ~CSF_THROWN; | |
| 1364 } | |
| 1365 cstack->cs_flags[idx] &= ~CSF_ACTIVE; | |
| 1366 cstack->cs_exception[idx] = current_exception; | |
| 1367 } | |
| 1368 #if 0 | |
| 21 | 1369 /* TODO: Add optimization below. Not yet done because of interface |
| 1370 * problems to eval.c and ex_cmds2.c. (Servatius) */ | |
| 7 | 1371 else |
| 1372 { | |
| 1373 /* | |
| 1374 * There are no catch clauses to check or finally clauses to execute. | |
| 1375 * End the current script or function. The exception will be rethrown | |
| 1376 * in the caller. | |
| 1377 */ | |
| 1378 if (getline_equal(eap->getline, eap->cookie, get_func_line)) | |
| 1379 current_funccal->returned = TRUE; | |
| 1380 elseif (eap->get_func_line == getsourceline) | |
| 1381 ((struct source_cookie *)eap->cookie)->finished = TRUE; | |
| 1382 } | |
| 1383 #endif | |
| 1384 | |
| 1385 did_throw = TRUE; | |
| 1386 } | |
| 1387 | |
| 1388 /* | |
| 1389 * ":try" | |
| 1390 */ | |
| 1391 void | |
| 1392 ex_try(eap) | |
| 1393 exarg_T *eap; | |
| 1394 { | |
| 1395 int skip; | |
| 1396 struct condstack *cstack = eap->cstack; | |
| 1397 | |
| 1398 if (cstack->cs_idx == CSTACK_LEN - 1) | |
| 1399 eap->errmsg = (char_u *)N_("E601: :try nesting too deep"); | |
| 1400 else | |
| 1401 { | |
| 1402 ++cstack->cs_idx; | |
| 1403 ++cstack->cs_trylevel; | |
| 1404 cstack->cs_flags[cstack->cs_idx] = CSF_TRY; | |
| 1405 cstack->cs_pending[cstack->cs_idx] = CSTP_NONE; | |
| 1406 | |
| 1407 /* | |
| 1408 * Don't do something after an error, interrupt, or throw, or when there | |
| 1409 * is a surrounding conditional and it was not active. | |
| 1410 */ | |
| 1411 skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0 | |
| 1412 && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE)); | |
| 1413 | |
| 1414 if (!skip) | |
| 1415 { | |
| 1416 /* Set ACTIVE and TRUE. TRUE means that the corresponding ":catch" | |
| 1417 * commands should check for a match if an exception is thrown and | |
| 1418 * that the finally clause needs to be executed. */ | |
| 1419 cstack->cs_flags[cstack->cs_idx] |= CSF_ACTIVE | CSF_TRUE; | |
| 1420 | |
| 1421 /* | |
| 1422 * ":silent!", even when used in a try conditional, disables | |
| 1423 * displaying of error messages and conversion of errors to | |
| 1424 * exceptions. When the silent commands again open a try | |
| 1425 * conditional, save "emsg_silent" and reset it so that errors are | |
| 1426 * again converted to exceptions. The value is restored when that | |
| 1427 * try conditional is left. If it is left normally, the commands | |
| 1428 * following the ":endtry" are again silent. If it is left by | |
| 1429 * a ":continue", ":break", ":return", or ":finish", the commands | |
| 1430 * executed next are again silent. If it is left due to an | |
| 1431 * aborting error, an interrupt, or an exception, restoring | |
| 1432 * "emsg_silent" does not matter since we are already in the | |
| 1433 * aborting state and/or the exception has already been thrown. | |
| 1434 * The effect is then just freeing the memory that was allocated | |
| 1435 * to save the value. | |
| 1436 */ | |
| 1437 if (emsg_silent) | |
| 1438 { | |
| 1439 eslist_T *elem; | |
| 1440 | |
| 1441 elem = (eslist_T *)alloc((unsigned)sizeof(struct eslist_elem)); | |
| 1442 if (elem == NULL) | |
| 1443 EMSG(_(e_outofmem)); | |
| 1444 else | |
| 1445 { | |
| 1446 elem->saved_emsg_silent = emsg_silent; | |
| 1447 elem->next = cstack->cs_emsg_silent_list; | |
| 1448 cstack->cs_emsg_silent_list = elem; | |
| 1449 cstack->cs_flags[cstack->cs_idx] |= CSF_SILENT; | |
| 1450 emsg_silent = 0; | |
| 1451 } | |
| 1452 } | |
| 1453 } | |
| 1454 | |
| 1455 } | |
| 1456 } | |
| 1457 | |
| 1458 /* | |
| 1459 * ":catch /{pattern}/" and ":catch" | |
| 1460 */ | |
| 1461 void | |
| 1462 ex_catch(eap) | |
| 1463 exarg_T *eap; | |
| 1464 { | |
| 1465 int idx = 0; | |
| 1466 int give_up = FALSE; | |
| 1467 int skip = FALSE; | |
| 1468 int caught = FALSE; | |
| 1469 char_u *end; | |
| 1470 int save_char = 0; | |
| 1471 char_u *save_cpo; | |
| 1472 regmatch_T regmatch; | |
| 1473 int prev_got_int; | |
| 1474 struct condstack *cstack = eap->cstack; | |
| 1475 char_u *pat; | |
| 1476 | |
| 1477 if (cstack->cs_trylevel <= 0 || cstack->cs_idx < 0) | |
| 1478 { | |
| 1479 eap->errmsg = (char_u *)N_("E603: :catch without :try"); | |
| 1480 give_up = TRUE; | |
| 1481 } | |
| 1482 else | |
| 1483 { | |
| 1484 if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY)) | |
| 1485 { | |
| 1486 /* Report what's missing if the matching ":try" is not in its | |
| 1487 * finally clause. */ | |
| 75 | 1488 eap->errmsg = get_end_emsg(cstack); |
| 7 | 1489 skip = TRUE; |
| 1490 } | |
| 1491 for (idx = cstack->cs_idx; idx > 0; --idx) | |
| 1492 if (cstack->cs_flags[idx] & CSF_TRY) | |
| 1493 break; | |
| 1494 if (cstack->cs_flags[idx] & CSF_FINALLY) | |
| 1495 { | |
| 1496 /* Give up for a ":catch" after ":finally" and ignore it. | |
| 1497 * Just parse. */ | |
| 1498 eap->errmsg = (char_u *)N_("E604: :catch after :finally"); | |
| 1499 give_up = TRUE; | |
| 1500 } | |
| 79 | 1501 else |
| 75 | 1502 rewind_conditionals(cstack, idx, CSF_WHILE | CSF_FOR, |
| 1503 &cstack->cs_looplevel); | |
| 7 | 1504 } |
| 1505 | |
| 1506 if (ends_excmd(*eap->arg)) /* no argument, catch all errors */ | |
| 1507 { | |
| 1508 pat = (char_u *)".*"; | |
| 1509 end = NULL; | |
| 1510 eap->nextcmd = find_nextcmd(eap->arg); | |
| 1511 } | |
| 1512 else | |
| 1513 { | |
| 1514 pat = eap->arg + 1; | |
| 1515 end = skip_regexp(pat, *eap->arg, TRUE, NULL); | |
| 1516 } | |
| 1517 | |
| 1518 if (!give_up) | |
| 1519 { | |
| 1520 /* | |
| 1521 * Don't do something when no exception has been thrown or when the | |
| 1522 * corresponding try block never got active (because of an inactive | |
| 1523 * surrounding conditional or after an error or interrupt or throw). | |
| 1524 */ | |
| 1525 if (!did_throw || !(cstack->cs_flags[idx] & CSF_TRUE)) | |
| 1526 skip = TRUE; | |
| 1527 | |
| 1528 /* | |
| 1529 * Check for a match only if an exception is thrown but not caught by | |
| 1530 * a previous ":catch". An exception that has replaced a discarded | |
| 1531 * exception is not checked (THROWN is not set then). | |
| 1532 */ | |
| 1533 if (!skip && (cstack->cs_flags[idx] & CSF_THROWN) | |
| 1534 && !(cstack->cs_flags[idx] & CSF_CAUGHT)) | |
| 1535 { | |
| 1536 if (end != NULL && *end != NUL && !ends_excmd(*skipwhite(end + 1))) | |
| 1537 { | |
| 1538 EMSG(_(e_trailing)); | |
| 1539 return; | |
| 1540 } | |
| 1541 | |
| 1542 /* When debugging or a breakpoint was encountered, display the | |
| 1543 * debug prompt (if not already done) before checking for a match. | |
| 1544 * This is a helpful hint for the user when the regular expression | |
| 1545 * matching fails. Handle a ">quit" debug command as if an | |
| 1546 * interrupt had occurred before the ":catch". That is, discard | |
| 1547 * the original exception, replace it by an interrupt exception, | |
| 1548 * and don't catch it in this try block. */ | |
| 1549 if (!dbg_check_skipped(eap) || !do_intthrow(cstack)) | |
| 1550 { | |
| 1551 /* Terminate the pattern and avoid the 'l' flag in 'cpoptions' | |
| 1552 * while compiling it. */ | |
| 1553 if (end != NULL) | |
| 1554 { | |
| 1555 save_char = *end; | |
| 1556 *end = NUL; | |
| 1557 } | |
| 1558 save_cpo = p_cpo; | |
| 1559 p_cpo = (char_u *)""; | |
| 1333 | 1560 regmatch.regprog = vim_regcomp(pat, RE_MAGIC + RE_STRING); |
| 7 | 1561 regmatch.rm_ic = FALSE; |
| 1562 if (end != NULL) | |
| 1563 *end = save_char; | |
| 1564 p_cpo = save_cpo; | |
| 1565 if (regmatch.regprog == NULL) | |
| 1566 EMSG2(_(e_invarg2), pat); | |
| 1567 else | |
| 1568 { | |
| 1569 /* | |
| 1570 * Save the value of got_int and reset it. We don't want | |
| 1571 * a previous interruption cancel matching, only hitting | |
| 1572 * CTRL-C while matching should abort it. | |
| 1573 */ | |
| 1574 prev_got_int = got_int; | |
| 1575 got_int = FALSE; | |
| 1576 caught = vim_regexec_nl(®match, current_exception->value, | |
| 1577 (colnr_T)0); | |
| 1578 got_int |= prev_got_int; | |
|
4805
66803af09906
updated for version 7.3.1149
Bram Moolenaar <bram@vim.org>
parents:
4352
diff
changeset
|
1579 vim_regfree(regmatch.regprog); |
| 7 | 1580 } |
| 1581 } | |
| 1582 } | |
| 1583 | |
| 1584 if (caught) | |
| 1585 { | |
| 1586 /* Make this ":catch" clause active and reset did_emsg, got_int, | |
| 1587 * and did_throw. Put the exception on the caught stack. */ | |
| 1588 cstack->cs_flags[idx] |= CSF_ACTIVE | CSF_CAUGHT; | |
| 1589 did_emsg = got_int = did_throw = FALSE; | |
| 1590 catch_exception((except_T *)cstack->cs_exception[idx]); | |
| 1591 /* It's mandatory that the current exception is stored in the cstack | |
| 1592 * so that it can be discarded at the next ":catch", ":finally", or | |
| 1593 * ":endtry" or when the catch clause is left by a ":continue", | |
| 1594 * ":break", ":return", ":finish", error, interrupt, or another | |
| 1595 * exception. */ | |
| 1596 if (cstack->cs_exception[cstack->cs_idx] != current_exception) | |
| 1597 EMSG(_(e_internal)); | |
| 1598 } | |
| 1599 else | |
| 1600 { | |
| 1601 /* | |
| 1602 * If there is a preceding catch clause and it caught the exception, | |
| 1603 * finish the exception now. This happens also after errors except | |
| 1604 * when this ":catch" was after the ":finally" or not within | |
| 1605 * a ":try". Make the try conditional inactive so that the | |
| 1606 * following catch clauses are skipped. On an error or interrupt | |
| 1607 * after the preceding try block or catch clause was left by | |
| 1608 * a ":continue", ":break", ":return", or ":finish", discard the | |
| 1609 * pending action. | |
| 1610 */ | |
| 1611 cleanup_conditionals(cstack, CSF_TRY, TRUE); | |
| 1612 } | |
| 1613 } | |
| 1614 | |
| 1615 if (end != NULL) | |
| 1616 eap->nextcmd = find_nextcmd(end); | |
| 1617 } | |
| 1618 | |
| 1619 /* | |
| 1620 * ":finally" | |
| 1621 */ | |
| 1622 void | |
| 1623 ex_finally(eap) | |
| 1624 exarg_T *eap; | |
| 1625 { | |
| 1626 int idx; | |
| 1627 int skip = FALSE; | |
| 1628 int pending = CSTP_NONE; | |
| 1629 struct condstack *cstack = eap->cstack; | |
| 1630 | |
| 1631 if (cstack->cs_trylevel <= 0 || cstack->cs_idx < 0) | |
| 1632 eap->errmsg = (char_u *)N_("E606: :finally without :try"); | |
| 1633 else | |
| 1634 { | |
| 1635 if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY)) | |
| 1636 { | |
| 75 | 1637 eap->errmsg = get_end_emsg(cstack); |
| 7 | 1638 for (idx = cstack->cs_idx - 1; idx > 0; --idx) |
| 1639 if (cstack->cs_flags[idx] & CSF_TRY) | |
| 1640 break; | |
| 1641 /* Make this error pending, so that the commands in the following | |
| 1642 * finally clause can be executed. This overrules also a pending | |
| 1643 * ":continue", ":break", ":return", or ":finish". */ | |
| 1644 pending = CSTP_ERROR; | |
| 1645 } | |
| 1646 else | |
| 1647 idx = cstack->cs_idx; | |
| 1648 | |
| 1649 if (cstack->cs_flags[idx] & CSF_FINALLY) | |
| 1650 { | |
| 1651 /* Give up for a multiple ":finally" and ignore it. */ | |
| 1652 eap->errmsg = (char_u *)N_("E607: multiple :finally"); | |
| 1653 return; | |
| 1654 } | |
| 79 | 1655 rewind_conditionals(cstack, idx, CSF_WHILE | CSF_FOR, |
| 75 | 1656 &cstack->cs_looplevel); |
| 7 | 1657 |
| 1658 /* | |
| 1659 * Don't do something when the corresponding try block never got active | |
| 1660 * (because of an inactive surrounding conditional or after an error or | |
| 1661 * interrupt or throw) or for a ":finally" without ":try" or a multiple | |
| 1662 * ":finally". After every other error (did_emsg or the conditional | |
| 1663 * errors detected above) or after an interrupt (got_int) or an | |
| 1664 * exception (did_throw), the finally clause must be executed. | |
| 1665 */ | |
| 1666 skip = !(cstack->cs_flags[cstack->cs_idx] & CSF_TRUE); | |
| 1667 | |
| 1668 if (!skip) | |
| 1669 { | |
| 1670 /* When debugging or a breakpoint was encountered, display the | |
| 1671 * debug prompt (if not already done). The user then knows that the | |
| 1672 * finally clause is executed. */ | |
| 1673 if (dbg_check_skipped(eap)) | |
| 1674 { | |
| 1675 /* Handle a ">quit" debug command as if an interrupt had | |
| 1676 * occurred before the ":finally". That is, discard the | |
| 1677 * original exception and replace it by an interrupt | |
| 1678 * exception. */ | |
| 1679 (void)do_intthrow(cstack); | |
| 1680 } | |
| 1681 | |
| 1682 /* | |
| 1683 * If there is a preceding catch clause and it caught the exception, | |
| 1684 * finish the exception now. This happens also after errors except | |
| 1685 * when this is a multiple ":finally" or one not within a ":try". | |
| 1686 * After an error or interrupt, this also discards a pending | |
| 1687 * ":continue", ":break", ":finish", or ":return" from the preceding | |
| 1688 * try block or catch clause. | |
| 1689 */ | |
| 1690 cleanup_conditionals(cstack, CSF_TRY, FALSE); | |
| 1691 | |
| 1692 /* | |
| 1693 * Make did_emsg, got_int, did_throw pending. If set, they overrule | |
| 1694 * a pending ":continue", ":break", ":return", or ":finish". Then | |
| 1695 * we have particularly to discard a pending return value (as done | |
| 1696 * by the call to cleanup_conditionals() above when did_emsg or | |
| 1697 * got_int is set). The pending values are restored by the | |
| 1698 * ":endtry", except if there is a new error, interrupt, exception, | |
| 1699 * ":continue", ":break", ":return", or ":finish" in the following | |
| 75 | 1700 * finally clause. A missing ":endwhile", ":endfor" or ":endif" |
| 1701 * detected here is treated as if did_emsg and did_throw had | |
| 1702 * already been set, respectively in case that the error is not | |
| 1703 * converted to an exception, did_throw had already been unset. | |
| 1704 * We must not set did_emsg here since that would suppress the | |
| 1705 * error message. | |
| 7 | 1706 */ |
| 1707 if (pending == CSTP_ERROR || did_emsg || got_int || did_throw) | |
| 1708 { | |
| 1709 if (cstack->cs_pending[cstack->cs_idx] == CSTP_RETURN) | |
| 1710 { | |
| 1711 report_discard_pending(CSTP_RETURN, | |
| 68 | 1712 cstack->cs_rettv[cstack->cs_idx]); |
| 1713 discard_pending_return(cstack->cs_rettv[cstack->cs_idx]); | |
| 7 | 1714 } |
| 1715 if (pending == CSTP_ERROR && !did_emsg) | |
| 1716 pending |= (THROW_ON_ERROR) ? CSTP_THROW : 0; | |
| 1717 else | |
| 1718 pending |= did_throw ? CSTP_THROW : 0; | |
| 1719 pending |= did_emsg ? CSTP_ERROR : 0; | |
| 1720 pending |= got_int ? CSTP_INTERRUPT : 0; | |
| 1721 cstack->cs_pending[cstack->cs_idx] = pending; | |
| 1722 | |
| 1723 /* It's mandatory that the current exception is stored in the | |
| 1724 * cstack so that it can be rethrown at the ":endtry" or be | |
| 1725 * discarded if the finally clause is left by a ":continue", | |
| 1726 * ":break", ":return", ":finish", error, interrupt, or another | |
| 1727 * exception. When emsg() is called for a missing ":endif" or | |
| 75 | 1728 * a missing ":endwhile"/":endfor" detected here, the |
| 1729 * exception will be discarded. */ | |
| 79 | 1730 if (did_throw && cstack->cs_exception[cstack->cs_idx] |
| 1731 != current_exception) | |
| 7 | 1732 EMSG(_(e_internal)); |
| 1733 } | |
| 1734 | |
| 1735 /* | |
| 75 | 1736 * Set CSL_HAD_FINA, so do_cmdline() will reset did_emsg, |
| 22 | 1737 * got_int, and did_throw and make the finally clause active. |
| 1738 * This will happen after emsg() has been called for a missing | |
| 75 | 1739 * ":endif" or a missing ":endwhile"/":endfor" detected here, so |
| 1740 * that the following finally clause will be executed even then. | |
| 7 | 1741 */ |
| 75 | 1742 cstack->cs_lflags |= CSL_HAD_FINA; |
| 7 | 1743 } |
| 1744 } | |
| 1745 } | |
| 1746 | |
| 1747 /* | |
| 1748 * ":endtry" | |
| 1749 */ | |
| 1750 void | |
| 1751 ex_endtry(eap) | |
| 1752 exarg_T *eap; | |
| 1753 { | |
| 1754 int idx; | |
| 1755 int skip; | |
| 1756 int rethrow = FALSE; | |
| 1757 int pending = CSTP_NONE; | |
| 68 | 1758 void *rettv = NULL; |
| 7 | 1759 struct condstack *cstack = eap->cstack; |
| 1760 | |
| 1761 if (cstack->cs_trylevel <= 0 || cstack->cs_idx < 0) | |
| 1762 eap->errmsg = (char_u *)N_("E602: :endtry without :try"); | |
| 1763 else | |
| 1764 { | |
| 1765 /* | |
| 1766 * Don't do something after an error, interrupt or throw in the try | |
| 1767 * block, catch clause, or finally clause preceding this ":endtry" or | |
| 1768 * when an error or interrupt occurred after a ":continue", ":break", | |
| 1769 * ":return", or ":finish" in a try block or catch clause preceding this | |
| 1770 * ":endtry" or when the try block never got active (because of an | |
| 1771 * inactive surrounding conditional or after an error or interrupt or | |
| 1772 * throw) or when there is a surrounding conditional and it has been | |
| 1773 * made inactive by a ":continue", ":break", ":return", or ":finish" in | |
| 1774 * the finally clause. The latter case need not be tested since then | |
| 1775 * anything pending has already been discarded. */ | |
| 1776 skip = did_emsg || got_int || did_throw || | |
| 1777 !(cstack->cs_flags[cstack->cs_idx] & CSF_TRUE); | |
| 1778 | |
| 1779 if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY)) | |
| 1780 { | |
| 75 | 1781 eap->errmsg = get_end_emsg(cstack); |
| 7 | 1782 /* Find the matching ":try" and report what's missing. */ |
| 1783 idx = cstack->cs_idx; | |
| 1784 do | |
| 1785 --idx; | |
| 1786 while (idx > 0 && !(cstack->cs_flags[idx] & CSF_TRY)); | |
| 75 | 1787 rewind_conditionals(cstack, idx, CSF_WHILE | CSF_FOR, |
| 1788 &cstack->cs_looplevel); | |
| 7 | 1789 skip = TRUE; |
| 1790 | |
| 1791 /* | |
| 1792 * If an exception is being thrown, discard it to prevent it from | |
| 1793 * being rethrown at the end of this function. It would be | |
| 1794 * discarded by the error message, anyway. Resets did_throw. | |
| 1795 * This does not affect the script termination due to the error | |
| 1796 * since "trylevel" is decremented after emsg() has been called. | |
| 1797 */ | |
| 1798 if (did_throw) | |
| 1799 discard_current_exception(); | |
| 1800 } | |
| 1801 else | |
| 1802 { | |
| 1803 idx = cstack->cs_idx; | |
| 1804 | |
| 1805 /* | |
| 1806 * If we stopped with the exception currently being thrown at this | |
| 1807 * try conditional since we didn't know that it doesn't have | |
| 1808 * a finally clause, we need to rethrow it after closing the try | |
| 1809 * conditional. | |
| 1810 */ | |
| 1811 if (did_throw && (cstack->cs_flags[idx] & CSF_TRUE) | |
| 1812 && !(cstack->cs_flags[idx] & CSF_FINALLY)) | |
| 1813 rethrow = TRUE; | |
| 1814 } | |
| 1815 | |
| 1816 /* If there was no finally clause, show the user when debugging or | |
| 1817 * a breakpoint was encountered that the end of the try conditional has | |
| 1818 * been reached: display the debug prompt (if not already done). Do | |
| 1819 * this on normal control flow or when an exception was thrown, but not | |
| 1820 * on an interrupt or error not converted to an exception or when | |
| 1821 * a ":break", ":continue", ":return", or ":finish" is pending. These | |
| 1822 * actions are carried out immediately. | |
| 1823 */ | |
| 1824 if ((rethrow || (!skip | |
| 1825 && !(cstack->cs_flags[idx] & CSF_FINALLY) | |
| 1826 && !cstack->cs_pending[idx])) | |
| 1827 && dbg_check_skipped(eap)) | |
| 1828 { | |
| 1829 /* Handle a ">quit" debug command as if an interrupt had occurred | |
| 1830 * before the ":endtry". That is, throw an interrupt exception and | |
| 1831 * set "skip" and "rethrow". */ | |
| 1832 if (got_int) | |
| 1833 { | |
| 1834 skip = TRUE; | |
| 1835 (void)do_intthrow(cstack); | |
| 1836 /* The do_intthrow() call may have reset did_throw or | |
| 1837 * cstack->cs_pending[idx].*/ | |
| 1838 rethrow = FALSE; | |
| 1839 if (did_throw && !(cstack->cs_flags[idx] & CSF_FINALLY)) | |
| 1840 rethrow = TRUE; | |
| 1841 } | |
| 1842 } | |
| 1843 | |
| 1844 /* | |
| 1845 * If a ":return" is pending, we need to resume it after closing the | |
| 1846 * try conditional; remember the return value. If there was a finally | |
| 1847 * clause making an exception pending, we need to rethrow it. Make it | |
| 1848 * the exception currently being thrown. | |
| 1849 */ | |
| 1850 if (!skip) | |
| 1851 { | |
| 1852 pending = cstack->cs_pending[idx]; | |
| 1853 cstack->cs_pending[idx] = CSTP_NONE; | |
| 1854 if (pending == CSTP_RETURN) | |
| 68 | 1855 rettv = cstack->cs_rettv[idx]; |
| 7 | 1856 else if (pending & CSTP_THROW) |
| 1857 current_exception = cstack->cs_exception[idx]; | |
| 1858 } | |
| 1859 | |
| 1860 /* | |
| 1861 * Discard anything pending on an error, interrupt, or throw in the | |
| 1862 * finally clause. If there was no ":finally", discard a pending | |
| 1863 * ":continue", ":break", ":return", or ":finish" if an error or | |
| 1864 * interrupt occurred afterwards, but before the ":endtry" was reached. | |
| 1865 * If an exception was caught by the last of the catch clauses and there | |
| 1866 * was no finally clause, finish the exception now. This happens also | |
| 1867 * after errors except when this ":endtry" is not within a ":try". | |
| 1868 * Restore "emsg_silent" if it has been reset by this try conditional. | |
| 1869 */ | |
| 840 | 1870 (void)cleanup_conditionals(cstack, CSF_TRY | CSF_SILENT, TRUE); |
| 7 | 1871 |
| 1872 --cstack->cs_idx; | |
| 1873 --cstack->cs_trylevel; | |
| 1874 | |
| 1875 if (!skip) | |
| 1876 { | |
| 1877 report_resume_pending(pending, | |
| 68 | 1878 (pending == CSTP_RETURN) ? rettv : |
| 7 | 1879 (pending & CSTP_THROW) ? (void *)current_exception : NULL); |
| 1880 switch (pending) | |
| 1881 { | |
| 1882 case CSTP_NONE: | |
| 1883 break; | |
| 1884 | |
| 1885 /* Reactivate a pending ":continue", ":break", ":return", | |
| 1886 * ":finish" from the try block or a catch clause of this try | |
| 1887 * conditional. This is skipped, if there was an error in an | |
| 1888 * (unskipped) conditional command or an interrupt afterwards | |
| 1889 * or if the finally clause is present and executed a new error, | |
| 1890 * interrupt, throw, ":continue", ":break", ":return", or | |
| 1891 * ":finish". */ | |
| 1892 case CSTP_CONTINUE: | |
| 1893 ex_continue(eap); | |
| 1894 break; | |
| 1895 case CSTP_BREAK: | |
| 1896 ex_break(eap); | |
| 1897 break; | |
| 1898 case CSTP_RETURN: | |
| 68 | 1899 do_return(eap, FALSE, FALSE, rettv); |
| 7 | 1900 break; |
| 1901 case CSTP_FINISH: | |
| 1902 do_finish(eap, FALSE); | |
| 1903 break; | |
| 1904 | |
| 1905 /* When the finally clause was entered due to an error, | |
| 1906 * interrupt or throw (as opposed to a ":continue", ":break", | |
| 1907 * ":return", or ":finish"), restore the pending values of | |
| 1908 * did_emsg, got_int, and did_throw. This is skipped, if there | |
| 1909 * was a new error, interrupt, throw, ":continue", ":break", | |
| 1910 * ":return", or ":finish". in the finally clause. */ | |
| 1911 default: | |
| 1912 if (pending & CSTP_ERROR) | |
| 1913 did_emsg = TRUE; | |
| 1914 if (pending & CSTP_INTERRUPT) | |
| 1915 got_int = TRUE; | |
| 1916 if (pending & CSTP_THROW) | |
| 1917 rethrow = TRUE; | |
| 1918 break; | |
| 1919 } | |
| 1920 } | |
| 1921 | |
| 1922 if (rethrow) | |
| 1923 /* Rethrow the current exception (within this cstack). */ | |
| 1924 do_throw(cstack); | |
| 1925 } | |
| 1926 } | |
| 1927 | |
| 1928 /* | |
| 36 | 1929 * enter_cleanup() and leave_cleanup() |
| 1930 * | |
| 1931 * Functions to be called before/after invoking a sequence of autocommands for | |
| 1932 * cleanup for a failed command. (Failure means here that a call to emsg() | |
| 1933 * has been made, an interrupt occurred, or there is an uncaught exception | |
| 1934 * from a previous autocommand execution of the same command.) | |
| 24 | 1935 * |
| 36 | 1936 * Call enter_cleanup() with a pointer to a cleanup_T and pass the same |
| 1937 * pointer to leave_cleanup(). The cleanup_T structure stores the pending | |
| 1938 * error/interrupt/exception state. | |
| 1939 */ | |
| 1940 | |
| 1941 /* | |
| 1942 * This function works a bit like ex_finally() except that there was not | |
| 1943 * actually an extra try block around the part that failed and an error or | |
| 1944 * interrupt has not (yet) been converted to an exception. This function | |
| 1945 * saves the error/interrupt/ exception state and prepares for the call to | |
| 1946 * do_cmdline() that is going to be made for the cleanup autocommand | |
| 1947 * execution. | |
| 24 | 1948 */ |
| 1949 void | |
| 1950 enter_cleanup(csp) | |
| 1951 cleanup_T *csp; | |
| 1952 { | |
| 1953 int pending = CSTP_NONE; | |
| 1954 | |
| 1955 /* | |
| 1956 * Postpone did_emsg, got_int, did_throw. The pending values will be | |
| 1957 * restored by leave_cleanup() except if there was an aborting error, | |
| 1958 * interrupt, or uncaught exception after this function ends. | |
| 1959 */ | |
| 1960 if (did_emsg || got_int || did_throw || need_rethrow) | |
| 1961 { | |
| 1962 csp->pending = (did_emsg ? CSTP_ERROR : 0) | |
| 1963 | (got_int ? CSTP_INTERRUPT : 0) | |
| 1964 | (did_throw ? CSTP_THROW : 0) | |
| 1965 | (need_rethrow ? CSTP_THROW : 0); | |
| 1966 | |
| 1967 /* If we are currently throwing an exception (did_throw), save it as | |
| 1968 * well. On an error not yet converted to an exception, update | |
| 1969 * "force_abort" and reset "cause_abort" (as do_errthrow() would do). | |
| 1970 * This is needed for the do_cmdline() call that is going to be made | |
| 1971 * for autocommand execution. We need not save *msg_list because | |
| 1972 * there is an extra instance for every call of do_cmdline(), anyway. | |
| 1973 */ | |
| 1974 if (did_throw || need_rethrow) | |
| 1975 csp->exception = current_exception; | |
| 1976 else | |
| 1977 { | |
| 1978 csp->exception = NULL; | |
| 1979 if (did_emsg) | |
| 1980 { | |
| 1981 force_abort |= cause_abort; | |
| 1982 cause_abort = FALSE; | |
| 1983 } | |
| 1984 } | |
| 1985 did_emsg = got_int = did_throw = need_rethrow = FALSE; | |
| 1986 | |
| 1987 /* Report if required by the 'verbose' option or when debugging. */ | |
| 1988 report_make_pending(pending, csp->exception); | |
| 1989 } | |
| 1990 else | |
| 1991 { | |
| 1992 csp->pending = CSTP_NONE; | |
| 1993 csp->exception = NULL; | |
| 1994 } | |
| 1995 } | |
| 1996 | |
| 1997 /* | |
| 36 | 1998 * See comment above enter_cleanup() for how this function is used. |
| 1999 * | |
| 2000 * This function is a bit like ex_endtry() except that there was not actually | |
| 2001 * an extra try block around the part that failed and an error or interrupt | |
| 2002 * had not (yet) been converted to an exception when the cleanup autocommand | |
| 2003 * sequence was invoked. | |
| 2004 * | |
| 2005 * This function has to be called with the address of the cleanup_T structure | |
| 2006 * filled by enter_cleanup() as an argument; it restores the error/interrupt/ | |
| 2007 * exception state saved by that function - except there was an aborting | |
| 2008 * error, an interrupt or an uncaught exception during execution of the | |
| 2009 * cleanup autocommands. In the latter case, the saved error/interrupt/ | |
| 2010 * exception state is discarded. | |
| 24 | 2011 */ |
| 2012 void | |
| 2013 leave_cleanup(csp) | |
| 2014 cleanup_T *csp; | |
| 2015 { | |
| 2016 int pending = csp->pending; | |
| 2017 | |
| 2018 if (pending == CSTP_NONE) /* nothing to do */ | |
| 2019 return; | |
| 2020 | |
| 2021 /* If there was an aborting error, an interrupt, or an uncaught exception | |
| 2022 * after the corresponding call to enter_cleanup(), discard what has been | |
| 2023 * made pending by it. Report this to the user if required by the | |
| 2024 * 'verbose' option or when debugging. */ | |
| 2025 if (aborting() || need_rethrow) | |
| 2026 { | |
| 2027 if (pending & CSTP_THROW) | |
| 2028 /* Cancel the pending exception (includes report). */ | |
| 2029 discard_exception((except_T *)csp->exception, FALSE); | |
| 2030 else | |
| 2031 report_discard_pending(pending, NULL); | |
| 2032 | |
| 2033 /* If an error was about to be converted to an exception when | |
| 2034 * enter_cleanup() was called, free the message list. */ | |
| 1046 | 2035 if (msg_list != NULL) |
| 2036 { | |
| 2037 free_msglist(*msg_list); | |
| 2038 *msg_list = NULL; | |
| 2039 } | |
| 24 | 2040 } |
| 2041 | |
| 2042 /* | |
| 2043 * If there was no new error, interrupt, or throw between the calls | |
| 2044 * to enter_cleanup() and leave_cleanup(), restore the pending | |
| 2045 * error/interrupt/exception state. | |
| 2046 */ | |
| 2047 else | |
| 2048 { | |
| 2049 /* | |
| 2050 * If there was an exception being thrown when enter_cleanup() was | |
| 2051 * called, we need to rethrow it. Make it the exception currently | |
| 2052 * being thrown. | |
| 2053 */ | |
| 2054 if (pending & CSTP_THROW) | |
| 2055 current_exception = csp->exception; | |
| 2056 | |
| 2057 /* | |
| 2058 * If an error was about to be converted to an exception when | |
| 2059 * enter_cleanup() was called, let "cause_abort" take the part of | |
| 2060 * "force_abort" (as done by cause_errthrow()). | |
| 2061 */ | |
| 2062 else if (pending & CSTP_ERROR) | |
| 2063 { | |
| 2064 cause_abort = force_abort; | |
| 2065 force_abort = FALSE; | |
| 2066 } | |
| 2067 | |
| 2068 /* | |
| 2069 * Restore the pending values of did_emsg, got_int, and did_throw. | |
| 2070 */ | |
| 2071 if (pending & CSTP_ERROR) | |
| 2072 did_emsg = TRUE; | |
| 2073 if (pending & CSTP_INTERRUPT) | |
| 2074 got_int = TRUE; | |
| 2075 if (pending & CSTP_THROW) | |
| 2076 need_rethrow = TRUE; /* did_throw will be set by do_one_cmd() */ | |
| 2077 | |
| 2078 /* Report if required by the 'verbose' option or when debugging. */ | |
| 2079 report_resume_pending(pending, | |
| 36 | 2080 (pending & CSTP_THROW) ? (void *)current_exception : NULL); |
| 24 | 2081 } |
| 2082 } | |
| 2083 | |
| 2084 | |
| 2085 /* | |
| 7 | 2086 * Make conditionals inactive and discard what's pending in finally clauses |
| 2087 * until the conditional type searched for or a try conditional not in its | |
| 79 | 2088 * finally clause is reached. If this is in an active catch clause, finish |
| 2089 * the caught exception. | |
| 2090 * Return the cstack index where the search stopped. | |
| 75 | 2091 * Values used for "searched_cond" are (CSF_WHILE | CSF_FOR) or CSF_TRY or 0, |
| 2092 * the latter meaning the innermost try conditional not in its finally clause. | |
| 2093 * "inclusive" tells whether the conditional searched for should be made | |
| 4352 | 2094 * inactive itself (a try conditional not in its finally clause possibly find |
| 75 | 2095 * before is always made inactive). If "inclusive" is TRUE and |
| 2096 * "searched_cond" is CSF_TRY|CSF_SILENT, the saved former value of | |
| 2097 * "emsg_silent", if reset when the try conditional finally reached was | |
| 4352 | 2098 * entered, is restored (used by ex_endtry()). This is normally done only |
| 75 | 2099 * when such a try conditional is left. |
| 7 | 2100 */ |
| 2101 int | |
| 2102 cleanup_conditionals(cstack, searched_cond, inclusive) | |
| 2103 struct condstack *cstack; | |
| 2104 int searched_cond; | |
| 2105 int inclusive; | |
| 2106 { | |
| 2107 int idx; | |
| 2108 int stop = FALSE; | |
| 2109 | |
| 2110 for (idx = cstack->cs_idx; idx >= 0; --idx) | |
| 2111 { | |
| 2112 if (cstack->cs_flags[idx] & CSF_TRY) | |
| 2113 { | |
| 2114 /* | |
| 2115 * Discard anything pending in a finally clause and continue the | |
| 2116 * search. There may also be a pending ":continue", ":break", | |
| 2117 * ":return", or ":finish" before the finally clause. We must not | |
| 2118 * discard it, unless an error or interrupt occurred afterwards. | |
| 2119 */ | |
| 359 | 2120 if (did_emsg || got_int || (cstack->cs_flags[idx] & CSF_FINALLY)) |
| 7 | 2121 { |
| 2122 switch (cstack->cs_pending[idx]) | |
| 2123 { | |
| 2124 case CSTP_NONE: | |
| 2125 break; | |
| 2126 | |
| 2127 case CSTP_CONTINUE: | |
| 2128 case CSTP_BREAK: | |
| 2129 case CSTP_FINISH: | |
| 2130 report_discard_pending(cstack->cs_pending[idx], NULL); | |
| 2131 cstack->cs_pending[idx] = CSTP_NONE; | |
| 2132 break; | |
| 2133 | |
| 2134 case CSTP_RETURN: | |
| 2135 report_discard_pending(CSTP_RETURN, | |
| 68 | 2136 cstack->cs_rettv[idx]); |
| 2137 discard_pending_return(cstack->cs_rettv[idx]); | |
| 7 | 2138 cstack->cs_pending[idx] = CSTP_NONE; |
| 2139 break; | |
| 2140 | |
| 2141 default: | |
| 2142 if (cstack->cs_flags[idx] & CSF_FINALLY) | |
| 2143 { | |
| 2144 if (cstack->cs_pending[idx] & CSTP_THROW) | |
| 2145 { | |
| 2146 /* Cancel the pending exception. This is in the | |
| 2147 * finally clause, so that the stack of the | |
| 2148 * caught exceptions is not involved. */ | |
| 2149 discard_exception((except_T *) | |
| 2150 cstack->cs_exception[idx], | |
| 2151 FALSE); | |
| 2152 } | |
| 2153 else | |
| 2154 report_discard_pending(cstack->cs_pending[idx], | |
| 2155 NULL); | |
| 2156 cstack->cs_pending[idx] = CSTP_NONE; | |
| 2157 } | |
| 2158 break; | |
| 2159 } | |
| 2160 } | |
| 2161 | |
| 2162 /* | |
| 2163 * Stop at a try conditional not in its finally clause. If this try | |
| 2164 * conditional is in an active catch clause, finish the caught | |
| 2165 * exception. | |
| 2166 */ | |
| 2167 if (!(cstack->cs_flags[idx] & CSF_FINALLY)) | |
| 2168 { | |
| 2169 if ((cstack->cs_flags[idx] & CSF_ACTIVE) | |
| 2170 && (cstack->cs_flags[idx] & CSF_CAUGHT)) | |
| 2171 finish_exception((except_T *)cstack->cs_exception[idx]); | |
| 2172 /* Stop at this try conditional - except the try block never | |
| 2173 * got active (because of an inactive surrounding conditional | |
| 2174 * or when the ":try" appeared after an error or interrupt or | |
| 2175 * throw). */ | |
| 2176 if (cstack->cs_flags[idx] & CSF_TRUE) | |
| 2177 { | |
| 2178 if (searched_cond == 0 && !inclusive) | |
| 2179 break; | |
| 2180 stop = TRUE; | |
| 2181 } | |
| 2182 } | |
| 2183 } | |
| 2184 | |
| 2185 /* Stop on the searched conditional type (even when the surrounding | |
| 2186 * conditional is not active or something has been made pending). | |
| 2187 * If "inclusive" is TRUE and "searched_cond" is CSF_TRY|CSF_SILENT, | |
| 2188 * check first whether "emsg_silent" needs to be restored. */ | |
| 2189 if (cstack->cs_flags[idx] & searched_cond) | |
| 2190 { | |
| 2191 if (!inclusive) | |
| 2192 break; | |
| 2193 stop = TRUE; | |
| 2194 } | |
| 2195 cstack->cs_flags[idx] &= ~CSF_ACTIVE; | |
| 2196 if (stop && searched_cond != (CSF_TRY | CSF_SILENT)) | |
| 2197 break; | |
| 2198 | |
| 2199 /* | |
| 1214 | 2200 * When leaving a try conditional that reset "emsg_silent" on its |
| 2201 * entry after saving the original value, restore that value here and | |
| 2202 * free the memory used to store it. | |
| 7 | 2203 */ |
| 2204 if ((cstack->cs_flags[idx] & CSF_TRY) | |
| 359 | 2205 && (cstack->cs_flags[idx] & CSF_SILENT)) |
| 7 | 2206 { |
| 2207 eslist_T *elem; | |
| 2208 | |
| 2209 elem = cstack->cs_emsg_silent_list; | |
| 2210 cstack->cs_emsg_silent_list = elem->next; | |
| 2211 emsg_silent = elem->saved_emsg_silent; | |
| 2212 vim_free(elem); | |
| 2213 cstack->cs_flags[idx] &= ~CSF_SILENT; | |
| 2214 } | |
| 2215 if (stop) | |
| 2216 break; | |
| 2217 } | |
| 2218 return idx; | |
| 2219 } | |
| 2220 | |
| 2221 /* | |
| 75 | 2222 * Return an appropriate error message for a missing endwhile/endfor/endif. |
| 2223 */ | |
| 2224 static char_u * | |
| 2225 get_end_emsg(cstack) | |
| 2226 struct condstack *cstack; | |
| 2227 { | |
| 2228 if (cstack->cs_flags[cstack->cs_idx] & CSF_WHILE) | |
| 2229 return e_endwhile; | |
| 2230 if (cstack->cs_flags[cstack->cs_idx] & CSF_FOR) | |
| 2231 return e_endfor; | |
| 2232 return e_endif; | |
| 2233 } | |
| 2234 | |
| 2235 | |
| 2236 /* | |
| 7 | 2237 * Rewind conditionals until index "idx" is reached. "cond_type" and |
| 2238 * "cond_level" specify a conditional type and the address of a level variable | |
| 2239 * which is to be decremented with each skipped conditional of the specified | |
| 2240 * type. | |
| 79 | 2241 * Also free "for info" structures where needed. |
| 7 | 2242 */ |
| 79 | 2243 void |
| 7 | 2244 rewind_conditionals(cstack, idx, cond_type, cond_level) |
| 2245 struct condstack *cstack; | |
| 2246 int idx; | |
| 2247 int cond_type; | |
| 2248 int *cond_level; | |
| 2249 { | |
| 2250 while (cstack->cs_idx > idx) | |
| 2251 { | |
| 2252 if (cstack->cs_flags[cstack->cs_idx] & cond_type) | |
| 2253 --*cond_level; | |
| 79 | 2254 if (cstack->cs_flags[cstack->cs_idx] & CSF_FOR) |
| 2255 free_for_info(cstack->cs_forinfo[cstack->cs_idx]); | |
| 7 | 2256 --cstack->cs_idx; |
| 2257 } | |
| 2258 } | |
| 2259 | |
| 2260 /* | |
| 2261 * ":endfunction" when not after a ":function" | |
| 2262 */ | |
| 2263 void | |
| 2264 ex_endfunction(eap) | |
| 1880 | 2265 exarg_T *eap UNUSED; |
| 7 | 2266 { |
| 2267 EMSG(_("E193: :endfunction not inside a function")); | |
| 2268 } | |
| 2269 | |
| 2270 /* | |
| 75 | 2271 * Return TRUE if the string "p" looks like a ":while" or ":for" command. |
| 7 | 2272 */ |
| 2273 int | |
| 75 | 2274 has_loop_cmd(p) |
| 7 | 2275 char_u *p; |
| 2276 { | |
| 1447 | 2277 int len; |
| 2278 | |
| 2279 /* skip modifiers, white space and ':' */ | |
| 2280 for (;;) | |
| 2281 { | |
| 2282 while (*p == ' ' || *p == '\t' || *p == ':') | |
| 2283 ++p; | |
| 2284 len = modifier_len(p); | |
| 2285 if (len == 0) | |
| 2286 break; | |
| 2287 p += len; | |
| 2288 } | |
| 75 | 2289 if ((p[0] == 'w' && p[1] == 'h') |
| 2290 || (p[0] == 'f' && p[1] == 'o' && p[2] == 'r')) | |
| 7 | 2291 return TRUE; |
| 2292 return FALSE; | |
| 2293 } | |
| 2294 | |
| 2295 #endif /* FEAT_EVAL */ |