Mercurial > vim
annotate src/ex_eval.c @ 20362:56a7fdb97a5d
Added tag v8.2.0736 for changeset 4bb526ae0989b1931c8ccb63d560b68b8e30686e
author | Bram Moolenaar <Bram@vim.org> |
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date | Mon, 11 May 2020 20:00:05 +0200 |
parents | 2c23053c654a |
children | c225be44692a |
rev | line source |
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1 /* vi:set ts=8 sts=4 sw=4 noet: |
7 | 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 | |
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18 static char *get_end_emsg(cstack_T *cstack); |
7 | 19 |
20 /* | |
21 * Exception handling terms: | |
22 * | |
23 * :try ":try" command \ | |
24 * ... try block | | |
25 * :catch RE ":catch" command | | |
26 * ... catch clause |- try conditional | |
27 * :finally ":finally" command | | |
28 * ... finally clause | | |
29 * :endtry ":endtry" command / | |
30 * | |
31 * The try conditional may have any number of catch clauses and at most one | |
32 * finally clause. A ":throw" command can be inside the try block, a catch | |
33 * clause, the finally clause, or in a function called or script sourced from | |
34 * there or even outside the try conditional. Try conditionals may be nested. | |
35 */ | |
36 | |
37 /* | |
38 * Configuration whether an exception is thrown on error or interrupt. When | |
39 * the preprocessor macros below evaluate to FALSE, an error (did_emsg) or | |
40 * interrupt (got_int) under an active try conditional terminates the script | |
41 * after the non-active finally clauses of all active try conditionals have been | |
42 * executed. Otherwise, errors and/or interrupts are converted into catchable | |
43 * exceptions (did_throw additionally set), which terminate the script only if | |
44 * not caught. For user exceptions, only did_throw is set. (Note: got_int can | |
4352 | 45 * be set asynchronously afterwards by a SIGINT, so did_throw && got_int is not |
7 | 46 * a reliant test that the exception currently being thrown is an interrupt |
47 * exception. Similarly, did_emsg can be set afterwards on an error in an | |
48 * (unskipped) conditional command inside an inactive conditional, so did_throw | |
49 * && did_emsg is not a reliant test that the exception currently being thrown | |
50 * is an error exception.) - The macros can be defined as expressions checking | |
51 * for a variable that is allowed to be changed during execution of a script. | |
52 */ | |
53 #if 0 | |
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54 // Expressions used for testing during the development phase. |
7 | 55 # define THROW_ON_ERROR (!eval_to_number("$VIMNOERRTHROW")) |
56 # define THROW_ON_INTERRUPT (!eval_to_number("$VIMNOINTTHROW")) | |
57 # define THROW_TEST | |
58 #else | |
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59 // Values used for the Vim release. |
7 | 60 # define THROW_ON_ERROR TRUE |
1880 | 61 # define THROW_ON_ERROR_TRUE |
7 | 62 # define THROW_ON_INTERRUPT TRUE |
1880 | 63 # define THROW_ON_INTERRUPT_TRUE |
7 | 64 #endif |
65 | |
66 /* | |
67 * When several errors appear in a row, setting "force_abort" is delayed until | |
68 * the failing command returned. "cause_abort" is set to TRUE meanwhile, in | |
69 * order to indicate that situation. This is useful when "force_abort" was set | |
70 * during execution of a function call from an expression: the aborting of the | |
71 * expression evaluation is done without producing any error messages, but all | |
72 * error messages on parsing errors during the expression evaluation are given | |
73 * (even if a try conditional is active). | |
74 */ | |
75 static int cause_abort = FALSE; | |
76 | |
77 /* | |
1214 | 78 * Return TRUE when immediately aborting on error, or when an interrupt |
7 | 79 * occurred or an exception was thrown but not caught. Use for ":{range}call" |
80 * to check whether an aborted function that does not handle a range itself | |
81 * should be called again for the next line in the range. Also used for | |
82 * cancelling expression evaluation after a function call caused an immediate | |
83 * abort. Note that the first emsg() call temporarily resets "force_abort" | |
84 * until the throw point for error messages has been reached. That is, during | |
85 * cancellation of an expression evaluation after an aborting function call or | |
86 * due to a parsing error, aborting() always returns the same value. | |
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87 * "got_int" is also set by calling interrupt(). |
7 | 88 */ |
89 int | |
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90 aborting(void) |
7 | 91 { |
92 return (did_emsg && force_abort) || got_int || did_throw; | |
93 } | |
94 | |
95 /* | |
96 * The value of "force_abort" is temporarily reset by the first emsg() call | |
97 * during an expression evaluation, and "cause_abort" is used instead. It might | |
98 * be necessary to restore "force_abort" even before the throw point for the | |
99 * error message has been reached. update_force_abort() should be called then. | |
100 */ | |
101 void | |
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102 update_force_abort(void) |
7 | 103 { |
104 if (cause_abort) | |
105 force_abort = TRUE; | |
106 } | |
107 | |
108 /* | |
109 * Return TRUE if a command with a subcommand resulting in "retcode" should | |
110 * abort the script processing. Can be used to suppress an autocommand after | |
111 * execution of a failing subcommand as long as the error message has not been | |
112 * displayed and actually caused the abortion. | |
113 */ | |
114 int | |
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115 should_abort(int retcode) |
7 | 116 { |
117 return ((retcode == FAIL && trylevel != 0 && !emsg_silent) || aborting()); | |
118 } | |
119 | |
120 /* | |
121 * Return TRUE if a function with the "abort" flag should not be considered | |
122 * ended on an error. This means that parsing commands is continued in order | |
123 * to find finally clauses to be executed, and that some errors in skipped | |
124 * commands are still reported. | |
125 */ | |
126 int | |
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127 aborted_in_try(void) |
7 | 128 { |
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129 // This function is only called after an error. In this case, "force_abort" |
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130 // determines whether searching for finally clauses is necessary. |
7 | 131 return force_abort; |
132 } | |
133 | |
134 /* | |
135 * cause_errthrow(): Cause a throw of an error exception if appropriate. | |
136 * Return TRUE if the error message should not be displayed by emsg(). | |
137 * Sets "ignore", if the emsg() call should be ignored completely. | |
138 * | |
139 * When several messages appear in the same command, the first is usually the | |
140 * most specific one and used as the exception value. The "severe" flag can be | |
141 * set to TRUE, if a later but severer message should be used instead. | |
142 */ | |
143 int | |
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144 cause_errthrow( |
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145 char_u *mesg, |
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146 int severe, |
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147 int *ignore) |
7 | 148 { |
149 struct msglist *elem; | |
150 struct msglist **plist; | |
151 | |
152 /* | |
839 | 153 * Do nothing when displaying the interrupt message or reporting an |
154 * uncaught exception (which has already been discarded then) at the top | |
155 * level. Also when no exception can be thrown. The message will be | |
156 * displayed by emsg(). | |
7 | 157 */ |
158 if (suppress_errthrow) | |
159 return FALSE; | |
160 | |
161 /* | |
839 | 162 * If emsg() has not been called previously, temporarily reset |
163 * "force_abort" until the throw point for error messages has been | |
164 * reached. This ensures that aborting() returns the same value for all | |
165 * errors that appear in the same command. This means particularly that | |
166 * for parsing errors during expression evaluation emsg() will be called | |
167 * multiply, even when the expression is evaluated from a finally clause | |
168 * that was activated due to an aborting error, interrupt, or exception. | |
7 | 169 */ |
170 if (!did_emsg) | |
171 { | |
172 cause_abort = force_abort; | |
173 force_abort = FALSE; | |
174 } | |
175 | |
176 /* | |
177 * If no try conditional is active and no exception is being thrown and | |
178 * there has not been an error in a try conditional or a throw so far, do | |
839 | 179 * nothing (for compatibility of non-EH scripts). The message will then |
180 * be displayed by emsg(). When ":silent!" was used and we are not | |
181 * currently throwing an exception, do nothing. The message text will | |
182 * then be stored to v:errmsg by emsg() without displaying it. | |
7 | 183 */ |
184 if (((trylevel == 0 && !cause_abort) || emsg_silent) && !did_throw) | |
185 return FALSE; | |
186 | |
187 /* | |
188 * Ignore an interrupt message when inside a try conditional or when an | |
839 | 189 * exception is being thrown or when an error in a try conditional or |
190 * throw has been detected previously. This is important in order that an | |
7 | 191 * interrupt exception is catchable by the innermost try conditional and |
192 * not replaced by an interrupt message error exception. | |
193 */ | |
194 if (mesg == (char_u *)_(e_interr)) | |
195 { | |
196 *ignore = TRUE; | |
197 return TRUE; | |
198 } | |
199 | |
200 /* | |
201 * Ensure that all commands in nested function calls and sourced files | |
202 * are aborted immediately. | |
203 */ | |
204 cause_abort = TRUE; | |
205 | |
206 /* | |
207 * When an exception is being thrown, some commands (like conditionals) are | |
208 * not skipped. Errors in those commands may affect what of the subsequent | |
209 * commands are regarded part of catch and finally clauses. Catching the | |
210 * exception would then cause execution of commands not intended by the | |
211 * user, who wouldn't even get aware of the problem. Therefor, discard the | |
212 * exception currently being thrown to prevent it from being caught. Just | |
213 * execute finally clauses and terminate. | |
214 */ | |
215 if (did_throw) | |
216 { | |
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217 // When discarding an interrupt exception, reset got_int to prevent the |
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218 // same interrupt being converted to an exception again and discarding |
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219 // the error exception we are about to throw here. |
7 | 220 if (current_exception->type == ET_INTERRUPT) |
221 got_int = FALSE; | |
222 discard_current_exception(); | |
223 } | |
224 | |
225 #ifdef THROW_TEST | |
226 if (!THROW_ON_ERROR) | |
227 { | |
228 /* | |
229 * Print error message immediately without searching for a matching | |
230 * catch clause; just finally clauses are executed before the script | |
231 * is terminated. | |
232 */ | |
233 return FALSE; | |
234 } | |
235 else | |
236 #endif | |
237 { | |
238 /* | |
239 * Prepare the throw of an error exception, so that everything will | |
240 * be aborted (except for executing finally clauses), until the error | |
241 * exception is caught; if still uncaught at the top level, the error | |
242 * message will be displayed and the script processing terminated | |
243 * then. - This function has no access to the conditional stack. | |
244 * Thus, the actual throw is made after the failing command has | |
245 * returned. - Throw only the first of several errors in a row, except | |
246 * a severe error is following. | |
247 */ | |
248 if (msg_list != NULL) | |
249 { | |
250 plist = msg_list; | |
251 while (*plist != NULL) | |
252 plist = &(*plist)->next; | |
253 | |
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254 elem = ALLOC_ONE(struct msglist); |
7 | 255 if (elem == NULL) |
256 { | |
257 suppress_errthrow = TRUE; | |
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258 emsg(_(e_outofmem)); |
7 | 259 } |
260 else | |
261 { | |
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262 elem->msg = (char *)vim_strsave(mesg); |
7 | 263 if (elem->msg == NULL) |
264 { | |
265 vim_free(elem); | |
266 suppress_errthrow = TRUE; | |
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267 emsg(_(e_outofmem)); |
7 | 268 } |
269 else | |
270 { | |
271 elem->next = NULL; | |
272 elem->throw_msg = NULL; | |
273 *plist = elem; | |
274 if (plist == msg_list || severe) | |
275 { | |
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276 char *tmsg; |
7 | 277 |
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278 // Skip the extra "Vim " prefix for message "E458". |
7 | 279 tmsg = elem->msg; |
280 if (STRNCMP(tmsg, "Vim E", 5) == 0 | |
281 && VIM_ISDIGIT(tmsg[5]) | |
282 && VIM_ISDIGIT(tmsg[6]) | |
283 && VIM_ISDIGIT(tmsg[7]) | |
284 && tmsg[8] == ':' | |
285 && tmsg[9] == ' ') | |
286 (*msg_list)->throw_msg = &tmsg[4]; | |
287 else | |
288 (*msg_list)->throw_msg = tmsg; | |
289 } | |
290 } | |
291 } | |
292 } | |
293 return TRUE; | |
294 } | |
295 } | |
296 | |
297 /* | |
298 * Free a "msg_list" and the messages it contains. | |
299 */ | |
300 static void | |
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301 free_msglist(struct msglist *l) |
7 | 302 { |
303 struct msglist *messages, *next; | |
304 | |
305 messages = l; | |
306 while (messages != NULL) | |
307 { | |
308 next = messages->next; | |
309 vim_free(messages->msg); | |
310 vim_free(messages); | |
311 messages = next; | |
312 } | |
313 } | |
314 | |
315 /* | |
5517 | 316 * Free global "*msg_list" and the messages it contains, then set "*msg_list" |
317 * to NULL. | |
318 */ | |
319 void | |
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320 free_global_msglist(void) |
5517 | 321 { |
322 free_msglist(*msg_list); | |
323 *msg_list = NULL; | |
324 } | |
325 | |
326 /* | |
7 | 327 * Throw the message specified in the call to cause_errthrow() above as an |
328 * error exception. If cstack is NULL, postpone the throw until do_cmdline() | |
329 * has returned (see do_one_cmd()). | |
330 */ | |
331 void | |
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332 do_errthrow(cstack_T *cstack, char_u *cmdname) |
7 | 333 { |
334 /* | |
335 * Ensure that all commands in nested function calls and sourced files | |
336 * are aborted immediately. | |
337 */ | |
338 if (cause_abort) | |
339 { | |
340 cause_abort = FALSE; | |
341 force_abort = TRUE; | |
342 } | |
343 | |
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344 // If no exception is to be thrown or the conversion should be done after |
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345 // returning to a previous invocation of do_one_cmd(), do nothing. |
1046 | 346 if (msg_list == NULL || *msg_list == NULL) |
7 | 347 return; |
348 | |
349 if (throw_exception(*msg_list, ET_ERROR, cmdname) == FAIL) | |
350 free_msglist(*msg_list); | |
351 else | |
352 { | |
353 if (cstack != NULL) | |
354 do_throw(cstack); | |
355 else | |
356 need_rethrow = TRUE; | |
357 } | |
358 *msg_list = NULL; | |
359 } | |
360 | |
361 /* | |
362 * do_intthrow(): Replace the current exception by an interrupt or interrupt | |
363 * exception if appropriate. Return TRUE if the current exception is discarded, | |
364 * FALSE otherwise. | |
365 */ | |
366 int | |
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367 do_intthrow(cstack_T *cstack) |
7 | 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 | |
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376 #ifdef THROW_TEST // avoid warning for condition always true |
7 | 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 | |
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403 // An interrupt exception replaces any user or error exception. |
7 | 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 /* | |
5517 | 414 * Get an exception message that is to be stored in current_exception->value. |
7 | 415 */ |
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416 char * |
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417 get_exception_string( |
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418 void *value, |
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419 except_type_T type, |
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420 char_u *cmdname, |
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421 int *should_free) |
7 | 422 { |
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423 char *ret; |
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424 char *mesg; |
7 | 425 int cmdlen; |
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426 char *p, *val; |
7 | 427 |
428 if (type == ET_ERROR) | |
429 { | |
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commit https://github.com/vim/vim/commit/9ef00be261115acb5bae3b3ca45c1d86a19ba2c7
Christian Brabandt <cb@256bit.org>
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diff
changeset
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430 *should_free = TRUE; |
5517 | 431 mesg = ((struct msglist *)value)->throw_msg; |
7 | 432 if (cmdname != NULL && *cmdname != NUL) |
433 { | |
835 | 434 cmdlen = (int)STRLEN(cmdname); |
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435 ret = (char *)vim_strnsave((char_u *)"Vim(", |
7 | 436 4 + cmdlen + 2 + (int)STRLEN(mesg)); |
5517 | 437 if (ret == NULL) |
438 return ret; | |
439 STRCPY(&ret[4], cmdname); | |
440 STRCPY(&ret[4 + cmdlen], "):"); | |
441 val = ret + 4 + cmdlen + 2; | |
7 | 442 } |
443 else | |
444 { | |
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445 ret = (char *)vim_strnsave((char_u *)"Vim:", 4 + (int)STRLEN(mesg)); |
5517 | 446 if (ret == NULL) |
447 return ret; | |
448 val = ret + 4; | |
7 | 449 } |
450 | |
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changeset
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451 // msg_add_fname may have been used to prefix the message with a file |
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452 // name in quotes. In the exception value, put the file name in |
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|
453 // parentheses and move it to the end. |
7 | 454 for (p = mesg; ; p++) |
455 { | |
456 if (*p == NUL | |
457 || (*p == 'E' | |
458 && VIM_ISDIGIT(p[1]) | |
459 && (p[2] == ':' | |
460 || (VIM_ISDIGIT(p[2]) | |
461 && (p[3] == ':' | |
462 || (VIM_ISDIGIT(p[3]) | |
463 && p[4] == ':')))))) | |
464 { | |
273 | 465 if (*p == NUL || p == mesg) |
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466 STRCAT(val, mesg); // 'E123' missing or at beginning |
7 | 467 else |
468 { | |
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469 // '"filename" E123: message text' |
7 | 470 if (mesg[0] != '"' || p-2 < &mesg[1] || |
471 p[-2] != '"' || p[-1] != ' ') | |
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472 // "E123:" is part of the file name. |
7 | 473 continue; |
474 | |
475 STRCAT(val, p); | |
476 p[-2] = NUL; | |
477 sprintf((char *)(val + STRLEN(p)), " (%s)", &mesg[1]); | |
478 p[-2] = '"'; | |
479 } | |
480 break; | |
481 } | |
482 } | |
483 } | |
484 else | |
5517 | 485 { |
486 *should_free = FALSE; | |
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487 ret = value; |
5517 | 488 } |
489 | |
490 return ret; | |
491 } | |
492 | |
493 | |
494 /* | |
495 * Throw a new exception. Return FAIL when out of memory or it was tried to | |
496 * throw an illegal user exception. "value" is the exception string for a | |
497 * user or interrupt exception, or points to a message list in case of an | |
498 * error exception. | |
499 */ | |
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500 int |
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501 throw_exception(void *value, except_type_T type, char_u *cmdname) |
5517 | 502 { |
503 except_T *excp; | |
504 int should_free; | |
505 | |
506 /* | |
507 * Disallow faking Interrupt or error exceptions as user exceptions. They | |
508 * would be treated differently from real interrupt or error exceptions | |
509 * when no active try block is found, see do_cmdline(). | |
510 */ | |
511 if (type == ET_USER) | |
512 { | |
513 if (STRNCMP((char_u *)value, "Vim", 3) == 0 | |
514 && (((char_u *)value)[3] == NUL || ((char_u *)value)[3] == ':' | |
515 || ((char_u *)value)[3] == '(')) | |
516 { | |
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517 emsg(_("E608: Cannot :throw exceptions with 'Vim' prefix")); |
5517 | 518 goto fail; |
519 } | |
520 } | |
521 | |
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522 excp = ALLOC_ONE(except_T); |
5517 | 523 if (excp == NULL) |
524 goto nomem; | |
525 | |
526 if (type == ET_ERROR) | |
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527 // Store the original message and prefix the exception value with |
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528 // "Vim:" or, if a command name is given, "Vim(cmdname):". |
5517 | 529 excp->messages = (struct msglist *)value; |
530 | |
531 excp->value = get_exception_string(value, type, cmdname, &should_free); | |
532 if (excp->value == NULL && should_free) | |
533 goto nomem; | |
7 | 534 |
535 excp->type = type; | |
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536 excp->throw_name = estack_sfile(); |
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537 if (excp->throw_name == NULL) |
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538 excp->throw_name = vim_strsave((char_u *)""); |
7 | 539 if (excp->throw_name == NULL) |
540 { | |
5517 | 541 if (should_free) |
7 | 542 vim_free(excp->value); |
543 goto nomem; | |
544 } | |
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545 excp->throw_lnum = SOURCING_LNUM; |
7 | 546 |
547 if (p_verbose >= 13 || debug_break_level > 0) | |
548 { | |
549 int save_msg_silent = msg_silent; | |
550 | |
551 if (debug_break_level > 0) | |
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552 msg_silent = FALSE; // display messages |
293 | 553 else |
554 verbose_enter(); | |
7 | 555 ++no_wait_return; |
293 | 556 if (debug_break_level > 0 || *p_vfile == NUL) |
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557 msg_scroll = TRUE; // always scroll up, don't overwrite |
293 | 558 |
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559 smsg(_("Exception thrown: %s"), excp->value); |
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560 msg_puts("\n"); // don't overwrite this either |
293 | 561 |
562 if (debug_break_level > 0 || *p_vfile == NUL) | |
563 cmdline_row = msg_row; | |
7 | 564 --no_wait_return; |
565 if (debug_break_level > 0) | |
566 msg_silent = save_msg_silent; | |
293 | 567 else |
568 verbose_leave(); | |
7 | 569 } |
570 | |
571 current_exception = excp; | |
572 return OK; | |
573 | |
574 nomem: | |
575 vim_free(excp); | |
576 suppress_errthrow = TRUE; | |
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577 emsg(_(e_outofmem)); |
7 | 578 fail: |
579 current_exception = NULL; | |
580 return FAIL; | |
581 } | |
582 | |
583 /* | |
584 * Discard an exception. "was_finished" is set when the exception has been | |
585 * caught and the catch clause has been ended normally. | |
586 */ | |
587 static void | |
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588 discard_exception(except_T *excp, int was_finished) |
7 | 589 { |
590 char_u *saved_IObuff; | |
591 | |
592 if (excp == NULL) | |
593 { | |
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594 internal_error("discard_exception()"); |
7 | 595 return; |
596 } | |
597 | |
598 if (p_verbose >= 13 || debug_break_level > 0) | |
599 { | |
600 int save_msg_silent = msg_silent; | |
601 | |
602 saved_IObuff = vim_strsave(IObuff); | |
603 if (debug_break_level > 0) | |
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604 msg_silent = FALSE; // display messages |
293 | 605 else |
606 verbose_enter(); | |
7 | 607 ++no_wait_return; |
293 | 608 if (debug_break_level > 0 || *p_vfile == NUL) |
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609 msg_scroll = TRUE; // always scroll up, don't overwrite |
273 | 610 smsg(was_finished |
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|
611 ? _("Exception finished: %s") |
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612 : _("Exception discarded: %s"), |
7 | 613 excp->value); |
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changeset
|
614 msg_puts("\n"); // don't overwrite this either |
293 | 615 if (debug_break_level > 0 || *p_vfile == NUL) |
616 cmdline_row = msg_row; | |
7 | 617 --no_wait_return; |
618 if (debug_break_level > 0) | |
619 msg_silent = save_msg_silent; | |
293 | 620 else |
621 verbose_leave(); | |
7 | 622 STRCPY(IObuff, saved_IObuff); |
623 vim_free(saved_IObuff); | |
624 } | |
625 if (excp->type != ET_INTERRUPT) | |
626 vim_free(excp->value); | |
627 if (excp->type == ET_ERROR) | |
628 free_msglist(excp->messages); | |
629 vim_free(excp->throw_name); | |
630 vim_free(excp); | |
631 } | |
632 | |
633 /* | |
634 * Discard the exception currently being thrown. | |
635 */ | |
636 void | |
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diff
changeset
|
637 discard_current_exception(void) |
7 | 638 { |
11645
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patch 8.0.0705: crash when there is an error in a timer callback
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diff
changeset
|
639 if (current_exception != NULL) |
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patch 8.0.0705: crash when there is an error in a timer callback
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changeset
|
640 { |
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changeset
|
641 discard_exception(current_exception, FALSE); |
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patch 8.0.0705: crash when there is an error in a timer callback
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changeset
|
642 current_exception = NULL; |
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patch 8.0.0705: crash when there is an error in a timer callback
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643 } |
7 | 644 did_throw = FALSE; |
645 need_rethrow = FALSE; | |
646 } | |
647 | |
648 /* | |
649 * Put an exception on the caught stack. | |
650 */ | |
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651 void |
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Christian Brabandt <cb@256bit.org>
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diff
changeset
|
652 catch_exception(except_T *excp) |
7 | 653 { |
654 excp->caught = caught_stack; | |
655 caught_stack = excp; | |
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656 set_vim_var_string(VV_EXCEPTION, (char_u *)excp->value, -1); |
7 | 657 if (*excp->throw_name != NUL) |
658 { | |
659 if (excp->throw_lnum != 0) | |
273 | 660 vim_snprintf((char *)IObuff, IOSIZE, _("%s, line %ld"), |
661 excp->throw_name, (long)excp->throw_lnum); | |
7 | 662 else |
273 | 663 vim_snprintf((char *)IObuff, IOSIZE, "%s", excp->throw_name); |
7 | 664 set_vim_var_string(VV_THROWPOINT, IObuff, -1); |
665 } | |
666 else | |
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|
667 // throw_name not set on an exception from a command that was typed. |
7 | 668 set_vim_var_string(VV_THROWPOINT, NULL, -1); |
669 | |
670 if (p_verbose >= 13 || debug_break_level > 0) | |
671 { | |
672 int save_msg_silent = msg_silent; | |
673 | |
674 if (debug_break_level > 0) | |
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|
675 msg_silent = FALSE; // display messages |
293 | 676 else |
677 verbose_enter(); | |
7 | 678 ++no_wait_return; |
293 | 679 if (debug_break_level > 0 || *p_vfile == NUL) |
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changeset
|
680 msg_scroll = TRUE; // always scroll up, don't overwrite |
293 | 681 |
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682 smsg(_("Exception caught: %s"), excp->value); |
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|
683 msg_puts("\n"); // don't overwrite this either |
293 | 684 |
685 if (debug_break_level > 0 || *p_vfile == NUL) | |
686 cmdline_row = msg_row; | |
7 | 687 --no_wait_return; |
688 if (debug_break_level > 0) | |
689 msg_silent = save_msg_silent; | |
293 | 690 else |
691 verbose_leave(); | |
7 | 692 } |
693 } | |
694 | |
695 /* | |
696 * Remove an exception from the caught stack. | |
697 */ | |
698 static void | |
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Christian Brabandt <cb@256bit.org>
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7801
diff
changeset
|
699 finish_exception(except_T *excp) |
7 | 700 { |
701 if (excp != caught_stack) | |
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Christian Brabandt <cb@256bit.org>
parents:
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diff
changeset
|
702 internal_error("finish_exception()"); |
7 | 703 caught_stack = caught_stack->caught; |
704 if (caught_stack != NULL) | |
705 { | |
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changeset
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706 set_vim_var_string(VV_EXCEPTION, (char_u *)caught_stack->value, -1); |
7 | 707 if (*caught_stack->throw_name != NUL) |
708 { | |
709 if (caught_stack->throw_lnum != 0) | |
273 | 710 vim_snprintf((char *)IObuff, IOSIZE, |
7 | 711 _("%s, line %ld"), caught_stack->throw_name, |
712 (long)caught_stack->throw_lnum); | |
713 else | |
273 | 714 vim_snprintf((char *)IObuff, IOSIZE, "%s", |
715 caught_stack->throw_name); | |
7 | 716 set_vim_var_string(VV_THROWPOINT, IObuff, -1); |
717 } | |
718 else | |
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719 // throw_name not set on an exception from a command that was |
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changeset
|
720 // typed. |
7 | 721 set_vim_var_string(VV_THROWPOINT, NULL, -1); |
722 } | |
723 else | |
724 { | |
725 set_vim_var_string(VV_EXCEPTION, NULL, -1); | |
726 set_vim_var_string(VV_THROWPOINT, NULL, -1); | |
727 } | |
728 | |
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changeset
|
729 // Discard the exception, but use the finish message for 'verbose'. |
7 | 730 discard_exception(excp, TRUE); |
731 } | |
732 | |
733 /* | |
734 * Flags specifying the message displayed by report_pending. | |
735 */ | |
736 #define RP_MAKE 0 | |
737 #define RP_RESUME 1 | |
738 #define RP_DISCARD 2 | |
739 | |
740 /* | |
741 * Report information about something pending in a finally clause if required by | |
742 * the 'verbose' option or when debugging. "action" tells whether something is | |
743 * made pending or something pending is resumed or discarded. "pending" tells | |
744 * what is pending. "value" specifies the return value for a pending ":return" | |
745 * or the exception value for a pending exception. | |
746 */ | |
747 static void | |
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Christian Brabandt <cb@256bit.org>
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diff
changeset
|
748 report_pending(int action, int pending, void *value) |
7 | 749 { |
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patch 8.1.0743: giving error messages is not flexible
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diff
changeset
|
750 char *mesg; |
7 | 751 char *s; |
752 int save_msg_silent; | |
753 | |
754 | |
755 switch (action) | |
756 { | |
757 case RP_MAKE: | |
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Bram Moolenaar <Bram@vim.org>
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changeset
|
758 mesg = _("%s made pending"); |
7 | 759 break; |
760 case RP_RESUME: | |
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patch 8.1.0743: giving error messages is not flexible
Bram Moolenaar <Bram@vim.org>
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diff
changeset
|
761 mesg = _("%s resumed"); |
7 | 762 break; |
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763 // case RP_DISCARD: |
7 | 764 default: |
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765 mesg = _("%s discarded"); |
7 | 766 break; |
767 } | |
768 | |
769 switch (pending) | |
770 { | |
771 case CSTP_NONE: | |
772 return; | |
773 | |
774 case CSTP_CONTINUE: | |
775 s = ":continue"; | |
776 break; | |
777 case CSTP_BREAK: | |
778 s = ":break"; | |
779 break; | |
780 case CSTP_FINISH: | |
781 s = ":finish"; | |
782 break; | |
783 case CSTP_RETURN: | |
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784 // ":return" command producing value, allocated |
7 | 785 s = (char *)get_return_cmd(value); |
786 break; | |
787 | |
788 default: | |
789 if (pending & CSTP_THROW) | |
790 { | |
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791 vim_snprintf((char *)IObuff, IOSIZE, mesg, _("Exception")); |
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792 mesg = (char *)vim_strnsave(IObuff, (int)STRLEN(IObuff) + 4); |
7 | 793 STRCAT(mesg, ": %s"); |
794 s = (char *)((except_T *)value)->value; | |
795 } | |
796 else if ((pending & CSTP_ERROR) && (pending & CSTP_INTERRUPT)) | |
797 s = _("Error and interrupt"); | |
798 else if (pending & CSTP_ERROR) | |
799 s = _("Error"); | |
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800 else // if (pending & CSTP_INTERRUPT) |
7 | 801 s = _("Interrupt"); |
802 } | |
803 | |
804 save_msg_silent = msg_silent; | |
805 if (debug_break_level > 0) | |
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806 msg_silent = FALSE; // display messages |
7 | 807 ++no_wait_return; |
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808 msg_scroll = TRUE; // always scroll up, don't overwrite |
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809 smsg(mesg, s); |
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810 msg_puts("\n"); // don't overwrite this either |
7 | 811 cmdline_row = msg_row; |
812 --no_wait_return; | |
813 if (debug_break_level > 0) | |
814 msg_silent = save_msg_silent; | |
815 | |
816 if (pending == CSTP_RETURN) | |
817 vim_free(s); | |
818 else if (pending & CSTP_THROW) | |
819 vim_free(mesg); | |
820 } | |
821 | |
822 /* | |
823 * If something is made pending in a finally clause, report it if required by | |
824 * the 'verbose' option or when debugging. | |
825 */ | |
826 void | |
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827 report_make_pending(int pending, void *value) |
7 | 828 { |
829 if (p_verbose >= 14 || debug_break_level > 0) | |
293 | 830 { |
831 if (debug_break_level <= 0) | |
832 verbose_enter(); | |
7 | 833 report_pending(RP_MAKE, pending, value); |
293 | 834 if (debug_break_level <= 0) |
835 verbose_leave(); | |
836 } | |
7 | 837 } |
838 | |
839 /* | |
840 * If something pending in a finally clause is resumed at the ":endtry", report | |
841 * it if required by the 'verbose' option or when debugging. | |
842 */ | |
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843 static void |
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844 report_resume_pending(int pending, void *value) |
7 | 845 { |
846 if (p_verbose >= 14 || debug_break_level > 0) | |
293 | 847 { |
848 if (debug_break_level <= 0) | |
849 verbose_enter(); | |
7 | 850 report_pending(RP_RESUME, pending, value); |
293 | 851 if (debug_break_level <= 0) |
852 verbose_leave(); | |
853 } | |
7 | 854 } |
855 | |
856 /* | |
857 * If something pending in a finally clause is discarded, report it if required | |
858 * by the 'verbose' option or when debugging. | |
859 */ | |
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860 static void |
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861 report_discard_pending(int pending, void *value) |
7 | 862 { |
863 if (p_verbose >= 14 || debug_break_level > 0) | |
293 | 864 { |
865 if (debug_break_level <= 0) | |
866 verbose_enter(); | |
7 | 867 report_pending(RP_DISCARD, pending, value); |
293 | 868 if (debug_break_level <= 0) |
869 verbose_leave(); | |
870 } | |
7 | 871 } |
872 | |
873 | |
874 /* | |
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875 * ":eval". |
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876 */ |
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877 void |
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878 ex_eval(exarg_T *eap) |
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879 { |
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880 typval_T tv; |
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881 |
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882 if (eval0(eap->arg, &tv, &eap->nextcmd, !eap->skip) == OK) |
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883 clear_tv(&tv); |
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884 } |
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885 |
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886 /* |
7 | 887 * ":if". |
888 */ | |
889 void | |
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890 ex_if(exarg_T *eap) |
7 | 891 { |
892 int error; | |
893 int skip; | |
894 int result; | |
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895 cstack_T *cstack = eap->cstack; |
7 | 896 |
897 if (cstack->cs_idx == CSTACK_LEN - 1) | |
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898 eap->errmsg = N_("E579: :if nesting too deep"); |
7 | 899 else |
900 { | |
901 ++cstack->cs_idx; | |
902 cstack->cs_flags[cstack->cs_idx] = 0; | |
903 | |
904 /* | |
905 * Don't do something after an error, interrupt, or throw, or when there | |
906 * is a surrounding conditional and it was not active. | |
907 */ | |
908 skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0 | |
909 && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE)); | |
910 | |
911 result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip); | |
912 | |
913 if (!skip && !error) | |
914 { | |
915 if (result) | |
916 cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE | CSF_TRUE; | |
917 } | |
918 else | |
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919 // set TRUE, so this conditional will never get active |
7 | 920 cstack->cs_flags[cstack->cs_idx] = CSF_TRUE; |
921 } | |
922 } | |
923 | |
924 /* | |
925 * ":endif". | |
926 */ | |
927 void | |
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928 ex_endif(exarg_T *eap) |
7 | 929 { |
930 did_endif = TRUE; | |
931 if (eap->cstack->cs_idx < 0 | |
79 | 932 || (eap->cstack->cs_flags[eap->cstack->cs_idx] |
933 & (CSF_WHILE | CSF_FOR | CSF_TRY))) | |
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934 eap->errmsg = N_(e_endif_without_if); |
7 | 935 else |
936 { | |
937 /* | |
938 * When debugging or a breakpoint was encountered, display the debug | |
939 * prompt (if not already done). This shows the user that an ":endif" | |
940 * is executed when the ":if" or a previous ":elseif" was not TRUE. | |
941 * Handle a ">quit" debug command as if an interrupt had occurred before | |
942 * the ":endif". That is, throw an interrupt exception if appropriate. | |
943 * Doing this here prevents an exception for a parsing error being | |
944 * discarded by throwing the interrupt exception later on. | |
945 */ | |
359 | 946 if (!(eap->cstack->cs_flags[eap->cstack->cs_idx] & CSF_TRUE) |
947 && dbg_check_skipped(eap)) | |
7 | 948 (void)do_intthrow(eap->cstack); |
949 | |
950 --eap->cstack->cs_idx; | |
951 } | |
952 } | |
953 | |
954 /* | |
955 * ":else" and ":elseif". | |
956 */ | |
957 void | |
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958 ex_else(exarg_T *eap) |
7 | 959 { |
960 int error; | |
961 int skip; | |
962 int result; | |
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963 cstack_T *cstack = eap->cstack; |
7 | 964 |
965 /* | |
966 * Don't do something after an error, interrupt, or throw, or when there is | |
967 * a surrounding conditional and it was not active. | |
968 */ | |
969 skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0 | |
970 && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE)); | |
971 | |
972 if (cstack->cs_idx < 0 | |
75 | 973 || (cstack->cs_flags[cstack->cs_idx] |
974 & (CSF_WHILE | CSF_FOR | CSF_TRY))) | |
7 | 975 { |
976 if (eap->cmdidx == CMD_else) | |
977 { | |
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978 eap->errmsg = N_(e_else_without_if); |
7 | 979 return; |
980 } | |
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981 eap->errmsg = N_(e_elseif_without_if); |
7 | 982 skip = TRUE; |
983 } | |
984 else if (cstack->cs_flags[cstack->cs_idx] & CSF_ELSE) | |
985 { | |
986 if (eap->cmdidx == CMD_else) | |
987 { | |
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988 eap->errmsg = N_("E583: multiple :else"); |
7 | 989 return; |
990 } | |
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991 eap->errmsg = N_("E584: :elseif after :else"); |
7 | 992 skip = TRUE; |
993 } | |
994 | |
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995 // if skipping or the ":if" was TRUE, reset ACTIVE, otherwise set it |
7 | 996 if (skip || cstack->cs_flags[cstack->cs_idx] & CSF_TRUE) |
997 { | |
998 if (eap->errmsg == NULL) | |
999 cstack->cs_flags[cstack->cs_idx] = CSF_TRUE; | |
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1000 skip = TRUE; // don't evaluate an ":elseif" |
7 | 1001 } |
1002 else | |
1003 cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE; | |
1004 | |
1005 /* | |
1006 * When debugging or a breakpoint was encountered, display the debug prompt | |
1007 * (if not already done). This shows the user that an ":else" or ":elseif" | |
1008 * is executed when the ":if" or previous ":elseif" was not TRUE. Handle | |
1009 * a ">quit" debug command as if an interrupt had occurred before the | |
1010 * ":else" or ":elseif". That is, set "skip" and throw an interrupt | |
1011 * exception if appropriate. Doing this here prevents that an exception | |
1012 * for a parsing errors is discarded when throwing the interrupt exception | |
1013 * later on. | |
1014 */ | |
1015 if (!skip && dbg_check_skipped(eap) && got_int) | |
1016 { | |
1017 (void)do_intthrow(cstack); | |
1018 skip = TRUE; | |
1019 } | |
1020 | |
1021 if (eap->cmdidx == CMD_elseif) | |
1022 { | |
1023 result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip); | |
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1024 |
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1025 // When throwing error exceptions, we want to throw always the first |
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1026 // of several errors in a row. This is what actually happens when |
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1027 // a conditional error was detected above and there is another failure |
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1028 // when parsing the expression. Since the skip flag is set in this |
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1029 // case, the parsing error will be ignored by emsg(). |
7 | 1030 if (!skip && !error) |
1031 { | |
1032 if (result) | |
1033 cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE | CSF_TRUE; | |
1034 else | |
1035 cstack->cs_flags[cstack->cs_idx] = 0; | |
1036 } | |
1037 else if (eap->errmsg == NULL) | |
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1038 // set TRUE, so this conditional will never get active |
7 | 1039 cstack->cs_flags[cstack->cs_idx] = CSF_TRUE; |
1040 } | |
1041 else | |
1042 cstack->cs_flags[cstack->cs_idx] |= CSF_ELSE; | |
1043 } | |
1044 | |
1045 /* | |
75 | 1046 * Handle ":while" and ":for". |
7 | 1047 */ |
1048 void | |
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1049 ex_while(exarg_T *eap) |
7 | 1050 { |
1051 int error; | |
1052 int skip; | |
1053 int result; | |
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1054 cstack_T *cstack = eap->cstack; |
7 | 1055 |
1056 if (cstack->cs_idx == CSTACK_LEN - 1) | |
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1057 eap->errmsg = N_("E585: :while/:for nesting too deep"); |
7 | 1058 else |
1059 { | |
1060 /* | |
75 | 1061 * The loop flag is set when we have jumped back from the matching |
1062 * ":endwhile" or ":endfor". When not set, need to initialise this | |
1063 * cstack entry. | |
7 | 1064 */ |
75 | 1065 if ((cstack->cs_lflags & CSL_HAD_LOOP) == 0) |
7 | 1066 { |
1067 ++cstack->cs_idx; | |
75 | 1068 ++cstack->cs_looplevel; |
7 | 1069 cstack->cs_line[cstack->cs_idx] = -1; |
1070 } | |
75 | 1071 cstack->cs_flags[cstack->cs_idx] = |
1072 eap->cmdidx == CMD_while ? CSF_WHILE : CSF_FOR; | |
7 | 1073 |
1074 /* | |
75 | 1075 * Don't do something after an error, interrupt, or throw, or when |
1076 * there is a surrounding conditional and it was not active. | |
7 | 1077 */ |
1078 skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0 | |
1079 && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE)); | |
75 | 1080 if (eap->cmdidx == CMD_while) |
1081 { | |
1082 /* | |
1083 * ":while bool-expr" | |
1084 */ | |
1085 result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip); | |
1086 } | |
1087 else | |
1088 { | |
1089 void *fi; | |
1090 | |
1091 /* | |
1092 * ":for var in list-expr" | |
1093 */ | |
1094 if ((cstack->cs_lflags & CSL_HAD_LOOP) != 0) | |
1095 { | |
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1096 // Jumping here from a ":continue" or ":endfor": use the |
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1097 // previously evaluated list. |
79 | 1098 fi = cstack->cs_forinfo[cstack->cs_idx]; |
75 | 1099 error = FALSE; |
1100 } | |
1101 else | |
1102 { | |
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1103 // Evaluate the argument and get the info in a structure. |
75 | 1104 fi = eval_for_line(eap->arg, &error, &eap->nextcmd, skip); |
79 | 1105 cstack->cs_forinfo[cstack->cs_idx] = fi; |
75 | 1106 } |
1107 | |
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1108 // use the element at the start of the list and advance |
75 | 1109 if (!error && fi != NULL && !skip) |
1110 result = next_for_item(fi, eap->arg); | |
1111 else | |
1112 result = FALSE; | |
1113 | |
1114 if (!result) | |
1115 { | |
1116 free_for_info(fi); | |
79 | 1117 cstack->cs_forinfo[cstack->cs_idx] = NULL; |
75 | 1118 } |
1119 } | |
7 | 1120 |
1121 /* | |
75 | 1122 * If this cstack entry was just initialised and is active, set the |
1123 * loop flag, so do_cmdline() will set the line number in cs_line[]. | |
1124 * If executing the command a second time, clear the loop flag. | |
7 | 1125 */ |
1126 if (!skip && !error && result) | |
1127 { | |
75 | 1128 cstack->cs_flags[cstack->cs_idx] |= (CSF_ACTIVE | CSF_TRUE); |
1129 cstack->cs_lflags ^= CSL_HAD_LOOP; | |
7 | 1130 } |
1131 else | |
1132 { | |
75 | 1133 cstack->cs_lflags &= ~CSL_HAD_LOOP; |
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1134 // If the ":while" evaluates to FALSE or ":for" is past the end of |
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1135 // the list, show the debug prompt at the ":endwhile"/":endfor" as |
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1136 // if there was a ":break" in a ":while"/":for" evaluating to |
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1137 // TRUE. |
7 | 1138 if (!skip && !error) |
1139 cstack->cs_flags[cstack->cs_idx] |= CSF_TRUE; | |
1140 } | |
1141 } | |
1142 } | |
1143 | |
1144 /* | |
1145 * ":continue" | |
1146 */ | |
1147 void | |
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1148 ex_continue(exarg_T *eap) |
7 | 1149 { |
1150 int idx; | |
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1151 cstack_T *cstack = eap->cstack; |
7 | 1152 |
75 | 1153 if (cstack->cs_looplevel <= 0 || cstack->cs_idx < 0) |
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1154 eap->errmsg = N_(e_continue); |
7 | 1155 else |
1156 { | |
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1157 // Try to find the matching ":while". This might stop at a try |
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1158 // conditional not in its finally clause (which is then to be executed |
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1159 // next). Therefor, inactivate all conditionals except the ":while" |
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1160 // itself (if reached). |
75 | 1161 idx = cleanup_conditionals(cstack, CSF_WHILE | CSF_FOR, FALSE); |
840 | 1162 if (idx >= 0 && (cstack->cs_flags[idx] & (CSF_WHILE | CSF_FOR))) |
7 | 1163 { |
79 | 1164 rewind_conditionals(cstack, idx, CSF_TRY, &cstack->cs_trylevel); |
7 | 1165 |
1166 /* | |
75 | 1167 * Set CSL_HAD_CONT, so do_cmdline() will jump back to the |
7 | 1168 * matching ":while". |
1169 */ | |
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1170 cstack->cs_lflags |= CSL_HAD_CONT; // let do_cmdline() handle it |
7 | 1171 } |
1172 else | |
1173 { | |
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1174 // If a try conditional not in its finally clause is reached first, |
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1175 // make the ":continue" pending for execution at the ":endtry". |
7 | 1176 cstack->cs_pending[idx] = CSTP_CONTINUE; |
1177 report_make_pending(CSTP_CONTINUE, NULL); | |
1178 } | |
1179 } | |
1180 } | |
1181 | |
1182 /* | |
1183 * ":break" | |
1184 */ | |
1185 void | |
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1186 ex_break(exarg_T *eap) |
7 | 1187 { |
1188 int idx; | |
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1189 cstack_T *cstack = eap->cstack; |
7 | 1190 |
75 | 1191 if (cstack->cs_looplevel <= 0 || cstack->cs_idx < 0) |
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1192 eap->errmsg = N_(e_break); |
7 | 1193 else |
1194 { | |
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1195 // Inactivate conditionals until the matching ":while" or a try |
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1196 // conditional not in its finally clause (which is then to be |
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1197 // executed next) is found. In the latter case, make the ":break" |
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1198 // pending for execution at the ":endtry". |
75 | 1199 idx = cleanup_conditionals(cstack, CSF_WHILE | CSF_FOR, TRUE); |
840 | 1200 if (idx >= 0 && !(cstack->cs_flags[idx] & (CSF_WHILE | CSF_FOR))) |
7 | 1201 { |
1202 cstack->cs_pending[idx] = CSTP_BREAK; | |
1203 report_make_pending(CSTP_BREAK, NULL); | |
1204 } | |
1205 } | |
1206 } | |
1207 | |
1208 /* | |
75 | 1209 * ":endwhile" and ":endfor" |
7 | 1210 */ |
1211 void | |
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1212 ex_endwhile(exarg_T *eap) |
7 | 1213 { |
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1214 cstack_T *cstack = eap->cstack; |
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1215 int idx; |
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1216 char *err; |
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1217 int csf; |
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1218 int fl; |
7 | 1219 |
75 | 1220 if (eap->cmdidx == CMD_endwhile) |
1221 { | |
1222 err = e_while; | |
1223 csf = CSF_WHILE; | |
1224 } | |
1225 else | |
1226 { | |
1227 err = e_for; | |
1228 csf = CSF_FOR; | |
1229 } | |
1230 | |
1231 if (cstack->cs_looplevel <= 0 || cstack->cs_idx < 0) | |
1232 eap->errmsg = err; | |
7 | 1233 else |
1234 { | |
75 | 1235 fl = cstack->cs_flags[cstack->cs_idx]; |
1236 if (!(fl & csf)) | |
7 | 1237 { |
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1238 // If we are in a ":while" or ":for" but used the wrong endloop |
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1239 // command, do not rewind to the next enclosing ":for"/":while". |
75 | 1240 if (fl & CSF_WHILE) |
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1241 eap->errmsg = _("E732: Using :endfor with :while"); |
75 | 1242 else if (fl & CSF_FOR) |
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1243 eap->errmsg = _("E733: Using :endwhile with :for"); |
114 | 1244 } |
1245 if (!(fl & (CSF_WHILE | CSF_FOR))) | |
1246 { | |
1247 if (!(fl & CSF_TRY)) | |
75 | 1248 eap->errmsg = e_endif; |
1249 else if (fl & CSF_FINALLY) | |
1250 eap->errmsg = e_endtry; | |
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1251 // Try to find the matching ":while" and report what's missing. |
7 | 1252 for (idx = cstack->cs_idx; idx > 0; --idx) |
1253 { | |
75 | 1254 fl = cstack->cs_flags[idx]; |
1255 if ((fl & CSF_TRY) && !(fl & CSF_FINALLY)) | |
7 | 1256 { |
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1257 // Give up at a try conditional not in its finally clause. |
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1258 // Ignore the ":endwhile"/":endfor". |
75 | 1259 eap->errmsg = err; |
7 | 1260 return; |
1261 } | |
75 | 1262 if (fl & csf) |
7 | 1263 break; |
1264 } | |
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1265 // Cleanup and rewind all contained (and unclosed) conditionals. |
75 | 1266 (void)cleanup_conditionals(cstack, CSF_WHILE | CSF_FOR, FALSE); |
7 | 1267 rewind_conditionals(cstack, idx, CSF_TRY, &cstack->cs_trylevel); |
1268 } | |
1269 | |
1270 /* | |
1271 * When debugging or a breakpoint was encountered, display the debug | |
1272 * prompt (if not already done). This shows the user that an | |
75 | 1273 * ":endwhile"/":endfor" is executed when the ":while" was not TRUE or |
1274 * after a ":break". Handle a ">quit" debug command as if an | |
1275 * interrupt had occurred before the ":endwhile"/":endfor". That is, | |
1276 * throw an interrupt exception if appropriate. Doing this here | |
1277 * prevents that an exception for a parsing error is discarded when | |
1278 * throwing the interrupt exception later on. | |
7 | 1279 */ |
1280 else if (cstack->cs_flags[cstack->cs_idx] & CSF_TRUE | |
1281 && !(cstack->cs_flags[cstack->cs_idx] & CSF_ACTIVE) | |
1282 && dbg_check_skipped(eap)) | |
1283 (void)do_intthrow(cstack); | |
1284 | |
1285 /* | |
75 | 1286 * Set loop flag, so do_cmdline() will jump back to the matching |
1287 * ":while" or ":for". | |
7 | 1288 */ |
75 | 1289 cstack->cs_lflags |= CSL_HAD_ENDLOOP; |
7 | 1290 } |
1291 } | |
1292 | |
1293 | |
1294 /* | |
1295 * ":throw expr" | |
1296 */ | |
1297 void | |
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1298 ex_throw(exarg_T *eap) |
7 | 1299 { |
1300 char_u *arg = eap->arg; | |
1301 char_u *value; | |
1302 | |
1303 if (*arg != NUL && *arg != '|' && *arg != '\n') | |
1304 value = eval_to_string_skip(arg, &eap->nextcmd, eap->skip); | |
1305 else | |
1306 { | |
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1307 emsg(_(e_argreq)); |
7 | 1308 value = NULL; |
1309 } | |
1310 | |
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1311 // On error or when an exception is thrown during argument evaluation, do |
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1312 // not throw. |
7 | 1313 if (!eap->skip && value != NULL) |
1314 { | |
1315 if (throw_exception(value, ET_USER, NULL) == FAIL) | |
1316 vim_free(value); | |
1317 else | |
1318 do_throw(eap->cstack); | |
1319 } | |
1320 } | |
1321 | |
1322 /* | |
21 | 1323 * Throw the current exception through the specified cstack. Common routine |
1324 * for ":throw" (user exception) and error and interrupt exceptions. Also | |
1325 * used for rethrowing an uncaught exception. | |
7 | 1326 */ |
1327 void | |
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1328 do_throw(cstack_T *cstack) |
7 | 1329 { |
1330 int idx; | |
1331 int inactivate_try = FALSE; | |
1332 | |
1333 /* | |
1334 * Cleanup and inactivate up to the next surrounding try conditional that | |
1335 * is not in its finally clause. Normally, do not inactivate the try | |
1336 * conditional itself, so that its ACTIVE flag can be tested below. But | |
1337 * if a previous error or interrupt has not been converted to an exception, | |
1338 * inactivate the try conditional, too, as if the conversion had been done, | |
21 | 1339 * and reset the did_emsg or got_int flag, so this won't happen again at |
1340 * the next surrounding try conditional. | |
7 | 1341 */ |
1880 | 1342 #ifndef THROW_ON_ERROR_TRUE |
7 | 1343 if (did_emsg && !THROW_ON_ERROR) |
1344 { | |
1345 inactivate_try = TRUE; | |
1346 did_emsg = FALSE; | |
1347 } | |
1880 | 1348 #endif |
1349 #ifndef THROW_ON_INTERRUPT_TRUE | |
7 | 1350 if (got_int && !THROW_ON_INTERRUPT) |
1351 { | |
1352 inactivate_try = TRUE; | |
1353 got_int = FALSE; | |
1354 } | |
1880 | 1355 #endif |
7 | 1356 idx = cleanup_conditionals(cstack, 0, inactivate_try); |
1357 if (idx >= 0) | |
1358 { | |
1359 /* | |
1360 * If this try conditional is active and we are before its first | |
21 | 1361 * ":catch", set THROWN so that the ":catch" commands will check |
1362 * whether the exception matches. When the exception came from any of | |
1363 * the catch clauses, it will be made pending at the ":finally" (if | |
1364 * present) and rethrown at the ":endtry". This will also happen if | |
1365 * the try conditional is inactive. This is the case when we are | |
1366 * throwing an exception due to an error or interrupt on the way from | |
1367 * a preceding ":continue", ":break", ":return", ":finish", error or | |
1368 * interrupt (not converted to an exception) to the finally clause or | |
1369 * from a preceding throw of a user or error or interrupt exception to | |
1370 * the matching catch clause or the finally clause. | |
7 | 1371 */ |
1372 if (!(cstack->cs_flags[idx] & CSF_CAUGHT)) | |
1373 { | |
1374 if (cstack->cs_flags[idx] & CSF_ACTIVE) | |
1375 cstack->cs_flags[idx] |= CSF_THROWN; | |
1376 else | |
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1377 // THROWN may have already been set for a catchable exception |
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1378 // that has been discarded. Ensure it is reset for the new |
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1379 // exception. |
7 | 1380 cstack->cs_flags[idx] &= ~CSF_THROWN; |
1381 } | |
1382 cstack->cs_flags[idx] &= ~CSF_ACTIVE; | |
1383 cstack->cs_exception[idx] = current_exception; | |
1384 } | |
1385 #if 0 | |
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1386 // TODO: Add optimization below. Not yet done because of interface |
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1387 // problems to eval.c and ex_cmds2.c. (Servatius) |
7 | 1388 else |
1389 { | |
1390 /* | |
1391 * There are no catch clauses to check or finally clauses to execute. | |
1392 * End the current script or function. The exception will be rethrown | |
1393 * in the caller. | |
1394 */ | |
1395 if (getline_equal(eap->getline, eap->cookie, get_func_line)) | |
1396 current_funccal->returned = TRUE; | |
1397 elseif (eap->get_func_line == getsourceline) | |
1398 ((struct source_cookie *)eap->cookie)->finished = TRUE; | |
1399 } | |
1400 #endif | |
1401 | |
1402 did_throw = TRUE; | |
1403 } | |
1404 | |
1405 /* | |
1406 * ":try" | |
1407 */ | |
1408 void | |
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1409 ex_try(exarg_T *eap) |
7 | 1410 { |
1411 int skip; | |
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1412 cstack_T *cstack = eap->cstack; |
7 | 1413 |
1414 if (cstack->cs_idx == CSTACK_LEN - 1) | |
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1415 eap->errmsg = N_("E601: :try nesting too deep"); |
7 | 1416 else |
1417 { | |
1418 ++cstack->cs_idx; | |
1419 ++cstack->cs_trylevel; | |
1420 cstack->cs_flags[cstack->cs_idx] = CSF_TRY; | |
1421 cstack->cs_pending[cstack->cs_idx] = CSTP_NONE; | |
1422 | |
1423 /* | |
1424 * Don't do something after an error, interrupt, or throw, or when there | |
1425 * is a surrounding conditional and it was not active. | |
1426 */ | |
1427 skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0 | |
1428 && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE)); | |
1429 | |
1430 if (!skip) | |
1431 { | |
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1432 // Set ACTIVE and TRUE. TRUE means that the corresponding ":catch" |
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1433 // commands should check for a match if an exception is thrown and |
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1434 // that the finally clause needs to be executed. |
7 | 1435 cstack->cs_flags[cstack->cs_idx] |= CSF_ACTIVE | CSF_TRUE; |
1436 | |
1437 /* | |
1438 * ":silent!", even when used in a try conditional, disables | |
1439 * displaying of error messages and conversion of errors to | |
1440 * exceptions. When the silent commands again open a try | |
1441 * conditional, save "emsg_silent" and reset it so that errors are | |
1442 * again converted to exceptions. The value is restored when that | |
1443 * try conditional is left. If it is left normally, the commands | |
1444 * following the ":endtry" are again silent. If it is left by | |
1445 * a ":continue", ":break", ":return", or ":finish", the commands | |
1446 * executed next are again silent. If it is left due to an | |
1447 * aborting error, an interrupt, or an exception, restoring | |
1448 * "emsg_silent" does not matter since we are already in the | |
1449 * aborting state and/or the exception has already been thrown. | |
1450 * The effect is then just freeing the memory that was allocated | |
1451 * to save the value. | |
1452 */ | |
1453 if (emsg_silent) | |
1454 { | |
1455 eslist_T *elem; | |
1456 | |
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1457 elem = ALLOC_ONE(struct eslist_elem); |
7 | 1458 if (elem == NULL) |
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1459 emsg(_(e_outofmem)); |
7 | 1460 else |
1461 { | |
1462 elem->saved_emsg_silent = emsg_silent; | |
1463 elem->next = cstack->cs_emsg_silent_list; | |
1464 cstack->cs_emsg_silent_list = elem; | |
1465 cstack->cs_flags[cstack->cs_idx] |= CSF_SILENT; | |
1466 emsg_silent = 0; | |
1467 } | |
1468 } | |
1469 } | |
1470 | |
1471 } | |
1472 } | |
1473 | |
1474 /* | |
1475 * ":catch /{pattern}/" and ":catch" | |
1476 */ | |
1477 void | |
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|
1478 ex_catch(exarg_T *eap) |
7 | 1479 { |
1480 int idx = 0; | |
1481 int give_up = FALSE; | |
1482 int skip = FALSE; | |
1483 int caught = FALSE; | |
1484 char_u *end; | |
1485 int save_char = 0; | |
1486 char_u *save_cpo; | |
1487 regmatch_T regmatch; | |
1488 int prev_got_int; | |
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1489 cstack_T *cstack = eap->cstack; |
7 | 1490 char_u *pat; |
1491 | |
1492 if (cstack->cs_trylevel <= 0 || cstack->cs_idx < 0) | |
1493 { | |
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1494 eap->errmsg = e_catch; |
7 | 1495 give_up = TRUE; |
1496 } | |
1497 else | |
1498 { | |
1499 if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY)) | |
1500 { | |
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1501 // Report what's missing if the matching ":try" is not in its |
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1502 // finally clause. |
75 | 1503 eap->errmsg = get_end_emsg(cstack); |
7 | 1504 skip = TRUE; |
1505 } | |
1506 for (idx = cstack->cs_idx; idx > 0; --idx) | |
1507 if (cstack->cs_flags[idx] & CSF_TRY) | |
1508 break; | |
1509 if (cstack->cs_flags[idx] & CSF_FINALLY) | |
1510 { | |
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1511 // Give up for a ":catch" after ":finally" and ignore it. |
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1512 // Just parse. |
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1513 eap->errmsg = N_("E604: :catch after :finally"); |
7 | 1514 give_up = TRUE; |
1515 } | |
79 | 1516 else |
75 | 1517 rewind_conditionals(cstack, idx, CSF_WHILE | CSF_FOR, |
1518 &cstack->cs_looplevel); | |
7 | 1519 } |
1520 | |
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1521 if (ends_excmd2(eap->cmd, eap->arg)) // no argument, catch all errors |
7 | 1522 { |
1523 pat = (char_u *)".*"; | |
1524 end = NULL; | |
1525 eap->nextcmd = find_nextcmd(eap->arg); | |
1526 } | |
1527 else | |
1528 { | |
1529 pat = eap->arg + 1; | |
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1530 end = skip_regexp_err(pat, *eap->arg, TRUE); |
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1531 if (end == NULL) |
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1532 give_up = TRUE; |
7 | 1533 } |
1534 | |
1535 if (!give_up) | |
1536 { | |
1537 /* | |
1538 * Don't do something when no exception has been thrown or when the | |
1539 * corresponding try block never got active (because of an inactive | |
1540 * surrounding conditional or after an error or interrupt or throw). | |
1541 */ | |
1542 if (!did_throw || !(cstack->cs_flags[idx] & CSF_TRUE)) | |
1543 skip = TRUE; | |
1544 | |
1545 /* | |
1546 * Check for a match only if an exception is thrown but not caught by | |
1547 * a previous ":catch". An exception that has replaced a discarded | |
1548 * exception is not checked (THROWN is not set then). | |
1549 */ | |
1550 if (!skip && (cstack->cs_flags[idx] & CSF_THROWN) | |
1551 && !(cstack->cs_flags[idx] & CSF_CAUGHT)) | |
1552 { | |
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1553 if (end != NULL && *end != NUL |
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1554 && !ends_excmd2(end, skipwhite(end + 1))) |
7 | 1555 { |
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1556 emsg(_(e_trailing)); |
7 | 1557 return; |
1558 } | |
1559 | |
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1560 // When debugging or a breakpoint was encountered, display the |
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1561 // debug prompt (if not already done) before checking for a match. |
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1562 // This is a helpful hint for the user when the regular expression |
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1563 // matching fails. Handle a ">quit" debug command as if an |
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1564 // interrupt had occurred before the ":catch". That is, discard |
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1565 // the original exception, replace it by an interrupt exception, |
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1566 // and don't catch it in this try block. |
7 | 1567 if (!dbg_check_skipped(eap) || !do_intthrow(cstack)) |
1568 { | |
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1569 // Terminate the pattern and avoid the 'l' flag in 'cpoptions' |
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1570 // while compiling it. |
7 | 1571 if (end != NULL) |
1572 { | |
1573 save_char = *end; | |
1574 *end = NUL; | |
1575 } | |
1576 save_cpo = p_cpo; | |
1577 p_cpo = (char_u *)""; | |
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1578 // Disable error messages, it will make current_exception |
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1579 // invalid. |
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1580 ++emsg_off; |
1333 | 1581 regmatch.regprog = vim_regcomp(pat, RE_MAGIC + RE_STRING); |
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1582 --emsg_off; |
7 | 1583 regmatch.rm_ic = FALSE; |
1584 if (end != NULL) | |
1585 *end = save_char; | |
1586 p_cpo = save_cpo; | |
1587 if (regmatch.regprog == NULL) | |
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1588 semsg(_(e_invarg2), pat); |
7 | 1589 else |
1590 { | |
1591 /* | |
1592 * Save the value of got_int and reset it. We don't want | |
1593 * a previous interruption cancel matching, only hitting | |
1594 * CTRL-C while matching should abort it. | |
1595 */ | |
1596 prev_got_int = got_int; | |
1597 got_int = FALSE; | |
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1598 caught = vim_regexec_nl(®match, |
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1599 (char_u *)current_exception->value, (colnr_T)0); |
7 | 1600 got_int |= prev_got_int; |
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1601 vim_regfree(regmatch.regprog); |
7 | 1602 } |
1603 } | |
1604 } | |
1605 | |
1606 if (caught) | |
1607 { | |
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1608 // Make this ":catch" clause active and reset did_emsg, got_int, |
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1609 // and did_throw. Put the exception on the caught stack. |
7 | 1610 cstack->cs_flags[idx] |= CSF_ACTIVE | CSF_CAUGHT; |
1611 did_emsg = got_int = did_throw = FALSE; | |
1612 catch_exception((except_T *)cstack->cs_exception[idx]); | |
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1613 // It's mandatory that the current exception is stored in the cstack |
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1614 // so that it can be discarded at the next ":catch", ":finally", or |
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1615 // ":endtry" or when the catch clause is left by a ":continue", |
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1616 // ":break", ":return", ":finish", error, interrupt, or another |
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1617 // exception. |
7 | 1618 if (cstack->cs_exception[cstack->cs_idx] != current_exception) |
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|
1619 internal_error("ex_catch()"); |
7 | 1620 } |
1621 else | |
1622 { | |
1623 /* | |
1624 * If there is a preceding catch clause and it caught the exception, | |
1625 * finish the exception now. This happens also after errors except | |
1626 * when this ":catch" was after the ":finally" or not within | |
1627 * a ":try". Make the try conditional inactive so that the | |
1628 * following catch clauses are skipped. On an error or interrupt | |
1629 * after the preceding try block or catch clause was left by | |
1630 * a ":continue", ":break", ":return", or ":finish", discard the | |
1631 * pending action. | |
1632 */ | |
1633 cleanup_conditionals(cstack, CSF_TRY, TRUE); | |
1634 } | |
1635 } | |
1636 | |
1637 if (end != NULL) | |
1638 eap->nextcmd = find_nextcmd(end); | |
1639 } | |
1640 | |
1641 /* | |
1642 * ":finally" | |
1643 */ | |
1644 void | |
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diff
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|
1645 ex_finally(exarg_T *eap) |
7 | 1646 { |
1647 int idx; | |
1648 int skip = FALSE; | |
1649 int pending = CSTP_NONE; | |
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1650 cstack_T *cstack = eap->cstack; |
7 | 1651 |
1652 if (cstack->cs_trylevel <= 0 || cstack->cs_idx < 0) | |
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1653 eap->errmsg = e_finally; |
7 | 1654 else |
1655 { | |
1656 if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY)) | |
1657 { | |
75 | 1658 eap->errmsg = get_end_emsg(cstack); |
7 | 1659 for (idx = cstack->cs_idx - 1; idx > 0; --idx) |
1660 if (cstack->cs_flags[idx] & CSF_TRY) | |
1661 break; | |
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1662 // Make this error pending, so that the commands in the following |
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1663 // finally clause can be executed. This overrules also a pending |
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1664 // ":continue", ":break", ":return", or ":finish". |
7 | 1665 pending = CSTP_ERROR; |
1666 } | |
1667 else | |
1668 idx = cstack->cs_idx; | |
1669 | |
1670 if (cstack->cs_flags[idx] & CSF_FINALLY) | |
1671 { | |
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1672 // Give up for a multiple ":finally" and ignore it. |
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1673 eap->errmsg = e_finally_dup; |
7 | 1674 return; |
1675 } | |
79 | 1676 rewind_conditionals(cstack, idx, CSF_WHILE | CSF_FOR, |
75 | 1677 &cstack->cs_looplevel); |
7 | 1678 |
1679 /* | |
1680 * Don't do something when the corresponding try block never got active | |
1681 * (because of an inactive surrounding conditional or after an error or | |
1682 * interrupt or throw) or for a ":finally" without ":try" or a multiple | |
1683 * ":finally". After every other error (did_emsg or the conditional | |
1684 * errors detected above) or after an interrupt (got_int) or an | |
1685 * exception (did_throw), the finally clause must be executed. | |
1686 */ | |
1687 skip = !(cstack->cs_flags[cstack->cs_idx] & CSF_TRUE); | |
1688 | |
1689 if (!skip) | |
1690 { | |
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1691 // When debugging or a breakpoint was encountered, display the |
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1692 // debug prompt (if not already done). The user then knows that the |
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1693 // finally clause is executed. |
7 | 1694 if (dbg_check_skipped(eap)) |
1695 { | |
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1696 // Handle a ">quit" debug command as if an interrupt had |
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1697 // occurred before the ":finally". That is, discard the |
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1698 // original exception and replace it by an interrupt |
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1699 // exception. |
7 | 1700 (void)do_intthrow(cstack); |
1701 } | |
1702 | |
1703 /* | |
1704 * If there is a preceding catch clause and it caught the exception, | |
1705 * finish the exception now. This happens also after errors except | |
1706 * when this is a multiple ":finally" or one not within a ":try". | |
1707 * After an error or interrupt, this also discards a pending | |
1708 * ":continue", ":break", ":finish", or ":return" from the preceding | |
1709 * try block or catch clause. | |
1710 */ | |
1711 cleanup_conditionals(cstack, CSF_TRY, FALSE); | |
1712 | |
1713 /* | |
1714 * Make did_emsg, got_int, did_throw pending. If set, they overrule | |
1715 * a pending ":continue", ":break", ":return", or ":finish". Then | |
1716 * we have particularly to discard a pending return value (as done | |
1717 * by the call to cleanup_conditionals() above when did_emsg or | |
1718 * got_int is set). The pending values are restored by the | |
1719 * ":endtry", except if there is a new error, interrupt, exception, | |
1720 * ":continue", ":break", ":return", or ":finish" in the following | |
75 | 1721 * finally clause. A missing ":endwhile", ":endfor" or ":endif" |
1722 * detected here is treated as if did_emsg and did_throw had | |
1723 * already been set, respectively in case that the error is not | |
1724 * converted to an exception, did_throw had already been unset. | |
1725 * We must not set did_emsg here since that would suppress the | |
1726 * error message. | |
7 | 1727 */ |
1728 if (pending == CSTP_ERROR || did_emsg || got_int || did_throw) | |
1729 { | |
1730 if (cstack->cs_pending[cstack->cs_idx] == CSTP_RETURN) | |
1731 { | |
1732 report_discard_pending(CSTP_RETURN, | |
68 | 1733 cstack->cs_rettv[cstack->cs_idx]); |
1734 discard_pending_return(cstack->cs_rettv[cstack->cs_idx]); | |
7 | 1735 } |
1736 if (pending == CSTP_ERROR && !did_emsg) | |
1737 pending |= (THROW_ON_ERROR) ? CSTP_THROW : 0; | |
1738 else | |
1739 pending |= did_throw ? CSTP_THROW : 0; | |
1740 pending |= did_emsg ? CSTP_ERROR : 0; | |
1741 pending |= got_int ? CSTP_INTERRUPT : 0; | |
1742 cstack->cs_pending[cstack->cs_idx] = pending; | |
1743 | |
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1744 // It's mandatory that the current exception is stored in the |
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1745 // cstack so that it can be rethrown at the ":endtry" or be |
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1746 // discarded if the finally clause is left by a ":continue", |
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1747 // ":break", ":return", ":finish", error, interrupt, or another |
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1748 // exception. When emsg() is called for a missing ":endif" or |
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1749 // a missing ":endwhile"/":endfor" detected here, the |
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1750 // exception will be discarded. |
79 | 1751 if (did_throw && cstack->cs_exception[cstack->cs_idx] |
1752 != current_exception) | |
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1753 internal_error("ex_finally()"); |
7 | 1754 } |
1755 | |
1756 /* | |
75 | 1757 * Set CSL_HAD_FINA, so do_cmdline() will reset did_emsg, |
22 | 1758 * got_int, and did_throw and make the finally clause active. |
1759 * This will happen after emsg() has been called for a missing | |
75 | 1760 * ":endif" or a missing ":endwhile"/":endfor" detected here, so |
1761 * that the following finally clause will be executed even then. | |
7 | 1762 */ |
75 | 1763 cstack->cs_lflags |= CSL_HAD_FINA; |
7 | 1764 } |
1765 } | |
1766 } | |
1767 | |
1768 /* | |
1769 * ":endtry" | |
1770 */ | |
1771 void | |
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1772 ex_endtry(exarg_T *eap) |
7 | 1773 { |
1774 int idx; | |
1775 int skip; | |
1776 int rethrow = FALSE; | |
1777 int pending = CSTP_NONE; | |
68 | 1778 void *rettv = NULL; |
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1779 cstack_T *cstack = eap->cstack; |
7 | 1780 |
1781 if (cstack->cs_trylevel <= 0 || cstack->cs_idx < 0) | |
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1782 eap->errmsg = e_no_endtry; |
7 | 1783 else |
1784 { | |
1785 /* | |
1786 * Don't do something after an error, interrupt or throw in the try | |
1787 * block, catch clause, or finally clause preceding this ":endtry" or | |
1788 * when an error or interrupt occurred after a ":continue", ":break", | |
1789 * ":return", or ":finish" in a try block or catch clause preceding this | |
1790 * ":endtry" or when the try block never got active (because of an | |
1791 * inactive surrounding conditional or after an error or interrupt or | |
1792 * throw) or when there is a surrounding conditional and it has been | |
1793 * made inactive by a ":continue", ":break", ":return", or ":finish" in | |
1794 * the finally clause. The latter case need not be tested since then | |
1795 * anything pending has already been discarded. */ | |
1796 skip = did_emsg || got_int || did_throw || | |
1797 !(cstack->cs_flags[cstack->cs_idx] & CSF_TRUE); | |
1798 | |
1799 if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY)) | |
1800 { | |
75 | 1801 eap->errmsg = get_end_emsg(cstack); |
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1802 // Find the matching ":try" and report what's missing. |
7 | 1803 idx = cstack->cs_idx; |
1804 do | |
1805 --idx; | |
1806 while (idx > 0 && !(cstack->cs_flags[idx] & CSF_TRY)); | |
75 | 1807 rewind_conditionals(cstack, idx, CSF_WHILE | CSF_FOR, |
1808 &cstack->cs_looplevel); | |
7 | 1809 skip = TRUE; |
1810 | |
1811 /* | |
1812 * If an exception is being thrown, discard it to prevent it from | |
1813 * being rethrown at the end of this function. It would be | |
1814 * discarded by the error message, anyway. Resets did_throw. | |
1815 * This does not affect the script termination due to the error | |
1816 * since "trylevel" is decremented after emsg() has been called. | |
1817 */ | |
1818 if (did_throw) | |
1819 discard_current_exception(); | |
1820 } | |
1821 else | |
1822 { | |
1823 idx = cstack->cs_idx; | |
1824 | |
1825 /* | |
1826 * If we stopped with the exception currently being thrown at this | |
1827 * try conditional since we didn't know that it doesn't have | |
1828 * a finally clause, we need to rethrow it after closing the try | |
1829 * conditional. | |
1830 */ | |
1831 if (did_throw && (cstack->cs_flags[idx] & CSF_TRUE) | |
1832 && !(cstack->cs_flags[idx] & CSF_FINALLY)) | |
1833 rethrow = TRUE; | |
1834 } | |
1835 | |
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1836 // If there was no finally clause, show the user when debugging or |
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1837 // a breakpoint was encountered that the end of the try conditional has |
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1838 // been reached: display the debug prompt (if not already done). Do |
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1839 // this on normal control flow or when an exception was thrown, but not |
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1840 // on an interrupt or error not converted to an exception or when |
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1841 // a ":break", ":continue", ":return", or ":finish" is pending. These |
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1842 // actions are carried out immediately. |
7 | 1843 if ((rethrow || (!skip |
1844 && !(cstack->cs_flags[idx] & CSF_FINALLY) | |
1845 && !cstack->cs_pending[idx])) | |
1846 && dbg_check_skipped(eap)) | |
1847 { | |
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1848 // Handle a ">quit" debug command as if an interrupt had occurred |
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1849 // before the ":endtry". That is, throw an interrupt exception and |
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1850 // set "skip" and "rethrow". |
7 | 1851 if (got_int) |
1852 { | |
1853 skip = TRUE; | |
1854 (void)do_intthrow(cstack); | |
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1855 // The do_intthrow() call may have reset did_throw or |
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1856 // cstack->cs_pending[idx]. |
7 | 1857 rethrow = FALSE; |
1858 if (did_throw && !(cstack->cs_flags[idx] & CSF_FINALLY)) | |
1859 rethrow = TRUE; | |
1860 } | |
1861 } | |
1862 | |
1863 /* | |
1864 * If a ":return" is pending, we need to resume it after closing the | |
1865 * try conditional; remember the return value. If there was a finally | |
1866 * clause making an exception pending, we need to rethrow it. Make it | |
1867 * the exception currently being thrown. | |
1868 */ | |
1869 if (!skip) | |
1870 { | |
1871 pending = cstack->cs_pending[idx]; | |
1872 cstack->cs_pending[idx] = CSTP_NONE; | |
1873 if (pending == CSTP_RETURN) | |
68 | 1874 rettv = cstack->cs_rettv[idx]; |
7 | 1875 else if (pending & CSTP_THROW) |
1876 current_exception = cstack->cs_exception[idx]; | |
1877 } | |
1878 | |
1879 /* | |
1880 * Discard anything pending on an error, interrupt, or throw in the | |
1881 * finally clause. If there was no ":finally", discard a pending | |
1882 * ":continue", ":break", ":return", or ":finish" if an error or | |
1883 * interrupt occurred afterwards, but before the ":endtry" was reached. | |
1884 * If an exception was caught by the last of the catch clauses and there | |
1885 * was no finally clause, finish the exception now. This happens also | |
1886 * after errors except when this ":endtry" is not within a ":try". | |
1887 * Restore "emsg_silent" if it has been reset by this try conditional. | |
1888 */ | |
840 | 1889 (void)cleanup_conditionals(cstack, CSF_TRY | CSF_SILENT, TRUE); |
7 | 1890 |
1891 --cstack->cs_idx; | |
1892 --cstack->cs_trylevel; | |
1893 | |
1894 if (!skip) | |
1895 { | |
1896 report_resume_pending(pending, | |
68 | 1897 (pending == CSTP_RETURN) ? rettv : |
7 | 1898 (pending & CSTP_THROW) ? (void *)current_exception : NULL); |
1899 switch (pending) | |
1900 { | |
1901 case CSTP_NONE: | |
1902 break; | |
1903 | |
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1904 // Reactivate a pending ":continue", ":break", ":return", |
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1905 // ":finish" from the try block or a catch clause of this try |
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1906 // conditional. This is skipped, if there was an error in an |
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1907 // (unskipped) conditional command or an interrupt afterwards |
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1908 // or if the finally clause is present and executed a new error, |
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1909 // interrupt, throw, ":continue", ":break", ":return", or |
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1910 // ":finish". |
7 | 1911 case CSTP_CONTINUE: |
1912 ex_continue(eap); | |
1913 break; | |
1914 case CSTP_BREAK: | |
1915 ex_break(eap); | |
1916 break; | |
1917 case CSTP_RETURN: | |
68 | 1918 do_return(eap, FALSE, FALSE, rettv); |
7 | 1919 break; |
1920 case CSTP_FINISH: | |
1921 do_finish(eap, FALSE); | |
1922 break; | |
1923 | |
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1924 // When the finally clause was entered due to an error, |
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1925 // interrupt or throw (as opposed to a ":continue", ":break", |
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1926 // ":return", or ":finish"), restore the pending values of |
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1927 // did_emsg, got_int, and did_throw. This is skipped, if there |
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1928 // was a new error, interrupt, throw, ":continue", ":break", |
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1929 // ":return", or ":finish". in the finally clause. |
7 | 1930 default: |
1931 if (pending & CSTP_ERROR) | |
1932 did_emsg = TRUE; | |
1933 if (pending & CSTP_INTERRUPT) | |
1934 got_int = TRUE; | |
1935 if (pending & CSTP_THROW) | |
1936 rethrow = TRUE; | |
1937 break; | |
1938 } | |
1939 } | |
1940 | |
1941 if (rethrow) | |
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1942 // Rethrow the current exception (within this cstack). |
7 | 1943 do_throw(cstack); |
1944 } | |
1945 } | |
1946 | |
1947 /* | |
36 | 1948 * enter_cleanup() and leave_cleanup() |
1949 * | |
1950 * Functions to be called before/after invoking a sequence of autocommands for | |
1951 * cleanup for a failed command. (Failure means here that a call to emsg() | |
1952 * has been made, an interrupt occurred, or there is an uncaught exception | |
1953 * from a previous autocommand execution of the same command.) | |
24 | 1954 * |
36 | 1955 * Call enter_cleanup() with a pointer to a cleanup_T and pass the same |
1956 * pointer to leave_cleanup(). The cleanup_T structure stores the pending | |
1957 * error/interrupt/exception state. | |
1958 */ | |
1959 | |
1960 /* | |
1961 * This function works a bit like ex_finally() except that there was not | |
1962 * actually an extra try block around the part that failed and an error or | |
1963 * interrupt has not (yet) been converted to an exception. This function | |
1964 * saves the error/interrupt/ exception state and prepares for the call to | |
1965 * do_cmdline() that is going to be made for the cleanup autocommand | |
1966 * execution. | |
24 | 1967 */ |
1968 void | |
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1969 enter_cleanup(cleanup_T *csp) |
24 | 1970 { |
1971 int pending = CSTP_NONE; | |
1972 | |
1973 /* | |
1974 * Postpone did_emsg, got_int, did_throw. The pending values will be | |
1975 * restored by leave_cleanup() except if there was an aborting error, | |
1976 * interrupt, or uncaught exception after this function ends. | |
1977 */ | |
1978 if (did_emsg || got_int || did_throw || need_rethrow) | |
1979 { | |
1980 csp->pending = (did_emsg ? CSTP_ERROR : 0) | |
1981 | (got_int ? CSTP_INTERRUPT : 0) | |
1982 | (did_throw ? CSTP_THROW : 0) | |
1983 | (need_rethrow ? CSTP_THROW : 0); | |
1984 | |
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1985 // If we are currently throwing an exception (did_throw), save it as |
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1986 // well. On an error not yet converted to an exception, update |
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1987 // "force_abort" and reset "cause_abort" (as do_errthrow() would do). |
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1988 // This is needed for the do_cmdline() call that is going to be made |
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1989 // for autocommand execution. We need not save *msg_list because |
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1990 // there is an extra instance for every call of do_cmdline(), anyway. |
24 | 1991 if (did_throw || need_rethrow) |
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1992 { |
24 | 1993 csp->exception = current_exception; |
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1994 current_exception = NULL; |
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1995 } |
24 | 1996 else |
1997 { | |
1998 csp->exception = NULL; | |
1999 if (did_emsg) | |
2000 { | |
2001 force_abort |= cause_abort; | |
2002 cause_abort = FALSE; | |
2003 } | |
2004 } | |
2005 did_emsg = got_int = did_throw = need_rethrow = FALSE; | |
2006 | |
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2007 // Report if required by the 'verbose' option or when debugging. |
24 | 2008 report_make_pending(pending, csp->exception); |
2009 } | |
2010 else | |
2011 { | |
2012 csp->pending = CSTP_NONE; | |
2013 csp->exception = NULL; | |
2014 } | |
2015 } | |
2016 | |
2017 /* | |
36 | 2018 * See comment above enter_cleanup() for how this function is used. |
2019 * | |
2020 * This function is a bit like ex_endtry() except that there was not actually | |
2021 * an extra try block around the part that failed and an error or interrupt | |
2022 * had not (yet) been converted to an exception when the cleanup autocommand | |
2023 * sequence was invoked. | |
2024 * | |
2025 * This function has to be called with the address of the cleanup_T structure | |
2026 * filled by enter_cleanup() as an argument; it restores the error/interrupt/ | |
2027 * exception state saved by that function - except there was an aborting | |
2028 * error, an interrupt or an uncaught exception during execution of the | |
2029 * cleanup autocommands. In the latter case, the saved error/interrupt/ | |
2030 * exception state is discarded. | |
24 | 2031 */ |
2032 void | |
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2033 leave_cleanup(cleanup_T *csp) |
24 | 2034 { |
2035 int pending = csp->pending; | |
2036 | |
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2037 if (pending == CSTP_NONE) // nothing to do |
24 | 2038 return; |
2039 | |
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2040 // If there was an aborting error, an interrupt, or an uncaught exception |
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2041 // after the corresponding call to enter_cleanup(), discard what has been |
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2042 // made pending by it. Report this to the user if required by the |
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2043 // 'verbose' option or when debugging. |
24 | 2044 if (aborting() || need_rethrow) |
2045 { | |
2046 if (pending & CSTP_THROW) | |
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2047 // Cancel the pending exception (includes report). |
24 | 2048 discard_exception((except_T *)csp->exception, FALSE); |
2049 else | |
2050 report_discard_pending(pending, NULL); | |
2051 | |
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2052 // If an error was about to be converted to an exception when |
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2053 // enter_cleanup() was called, free the message list. |
1046 | 2054 if (msg_list != NULL) |
5517 | 2055 free_global_msglist(); |
24 | 2056 } |
2057 | |
2058 /* | |
2059 * If there was no new error, interrupt, or throw between the calls | |
2060 * to enter_cleanup() and leave_cleanup(), restore the pending | |
2061 * error/interrupt/exception state. | |
2062 */ | |
2063 else | |
2064 { | |
2065 /* | |
2066 * If there was an exception being thrown when enter_cleanup() was | |
2067 * called, we need to rethrow it. Make it the exception currently | |
2068 * being thrown. | |
2069 */ | |
2070 if (pending & CSTP_THROW) | |
2071 current_exception = csp->exception; | |
2072 | |
2073 /* | |
2074 * If an error was about to be converted to an exception when | |
2075 * enter_cleanup() was called, let "cause_abort" take the part of | |
2076 * "force_abort" (as done by cause_errthrow()). | |
2077 */ | |
2078 else if (pending & CSTP_ERROR) | |
2079 { | |
2080 cause_abort = force_abort; | |
2081 force_abort = FALSE; | |
2082 } | |
2083 | |
2084 /* | |
2085 * Restore the pending values of did_emsg, got_int, and did_throw. | |
2086 */ | |
2087 if (pending & CSTP_ERROR) | |
2088 did_emsg = TRUE; | |
2089 if (pending & CSTP_INTERRUPT) | |
2090 got_int = TRUE; | |
2091 if (pending & CSTP_THROW) | |
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2092 need_rethrow = TRUE; // did_throw will be set by do_one_cmd() |
24 | 2093 |
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2094 // Report if required by the 'verbose' option or when debugging. |
24 | 2095 report_resume_pending(pending, |
36 | 2096 (pending & CSTP_THROW) ? (void *)current_exception : NULL); |
24 | 2097 } |
2098 } | |
2099 | |
2100 | |
2101 /* | |
7 | 2102 * Make conditionals inactive and discard what's pending in finally clauses |
2103 * until the conditional type searched for or a try conditional not in its | |
79 | 2104 * finally clause is reached. If this is in an active catch clause, finish |
2105 * the caught exception. | |
2106 * Return the cstack index where the search stopped. | |
75 | 2107 * Values used for "searched_cond" are (CSF_WHILE | CSF_FOR) or CSF_TRY or 0, |
2108 * the latter meaning the innermost try conditional not in its finally clause. | |
2109 * "inclusive" tells whether the conditional searched for should be made | |
4352 | 2110 * inactive itself (a try conditional not in its finally clause possibly find |
75 | 2111 * before is always made inactive). If "inclusive" is TRUE and |
2112 * "searched_cond" is CSF_TRY|CSF_SILENT, the saved former value of | |
2113 * "emsg_silent", if reset when the try conditional finally reached was | |
4352 | 2114 * entered, is restored (used by ex_endtry()). This is normally done only |
75 | 2115 * when such a try conditional is left. |
7 | 2116 */ |
2117 int | |
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2118 cleanup_conditionals( |
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2119 cstack_T *cstack, |
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2120 int searched_cond, |
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2121 int inclusive) |
7 | 2122 { |
2123 int idx; | |
2124 int stop = FALSE; | |
2125 | |
2126 for (idx = cstack->cs_idx; idx >= 0; --idx) | |
2127 { | |
2128 if (cstack->cs_flags[idx] & CSF_TRY) | |
2129 { | |
2130 /* | |
2131 * Discard anything pending in a finally clause and continue the | |
2132 * search. There may also be a pending ":continue", ":break", | |
2133 * ":return", or ":finish" before the finally clause. We must not | |
2134 * discard it, unless an error or interrupt occurred afterwards. | |
2135 */ | |
359 | 2136 if (did_emsg || got_int || (cstack->cs_flags[idx] & CSF_FINALLY)) |
7 | 2137 { |
2138 switch (cstack->cs_pending[idx]) | |
2139 { | |
2140 case CSTP_NONE: | |
2141 break; | |
2142 | |
2143 case CSTP_CONTINUE: | |
2144 case CSTP_BREAK: | |
2145 case CSTP_FINISH: | |
2146 report_discard_pending(cstack->cs_pending[idx], NULL); | |
2147 cstack->cs_pending[idx] = CSTP_NONE; | |
2148 break; | |
2149 | |
2150 case CSTP_RETURN: | |
2151 report_discard_pending(CSTP_RETURN, | |
68 | 2152 cstack->cs_rettv[idx]); |
2153 discard_pending_return(cstack->cs_rettv[idx]); | |
7 | 2154 cstack->cs_pending[idx] = CSTP_NONE; |
2155 break; | |
2156 | |
2157 default: | |
2158 if (cstack->cs_flags[idx] & CSF_FINALLY) | |
2159 { | |
2160 if (cstack->cs_pending[idx] & CSTP_THROW) | |
2161 { | |
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2162 // Cancel the pending exception. This is in the |
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2163 // finally clause, so that the stack of the |
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2164 // caught exceptions is not involved. |
7 | 2165 discard_exception((except_T *) |
2166 cstack->cs_exception[idx], | |
2167 FALSE); | |
2168 } | |
2169 else | |
2170 report_discard_pending(cstack->cs_pending[idx], | |
2171 NULL); | |
2172 cstack->cs_pending[idx] = CSTP_NONE; | |
2173 } | |
2174 break; | |
2175 } | |
2176 } | |
2177 | |
2178 /* | |
2179 * Stop at a try conditional not in its finally clause. If this try | |
2180 * conditional is in an active catch clause, finish the caught | |
2181 * exception. | |
2182 */ | |
2183 if (!(cstack->cs_flags[idx] & CSF_FINALLY)) | |
2184 { | |
2185 if ((cstack->cs_flags[idx] & CSF_ACTIVE) | |
2186 && (cstack->cs_flags[idx] & CSF_CAUGHT)) | |
2187 finish_exception((except_T *)cstack->cs_exception[idx]); | |
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2188 // Stop at this try conditional - except the try block never |
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2189 // got active (because of an inactive surrounding conditional |
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2190 // or when the ":try" appeared after an error or interrupt or |
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2191 // throw). |
7 | 2192 if (cstack->cs_flags[idx] & CSF_TRUE) |
2193 { | |
2194 if (searched_cond == 0 && !inclusive) | |
2195 break; | |
2196 stop = TRUE; | |
2197 } | |
2198 } | |
2199 } | |
2200 | |
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2201 // Stop on the searched conditional type (even when the surrounding |
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2202 // conditional is not active or something has been made pending). |
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2203 // If "inclusive" is TRUE and "searched_cond" is CSF_TRY|CSF_SILENT, |
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2204 // check first whether "emsg_silent" needs to be restored. |
7 | 2205 if (cstack->cs_flags[idx] & searched_cond) |
2206 { | |
2207 if (!inclusive) | |
2208 break; | |
2209 stop = TRUE; | |
2210 } | |
2211 cstack->cs_flags[idx] &= ~CSF_ACTIVE; | |
2212 if (stop && searched_cond != (CSF_TRY | CSF_SILENT)) | |
2213 break; | |
2214 | |
2215 /* | |
1214 | 2216 * When leaving a try conditional that reset "emsg_silent" on its |
2217 * entry after saving the original value, restore that value here and | |
2218 * free the memory used to store it. | |
7 | 2219 */ |
2220 if ((cstack->cs_flags[idx] & CSF_TRY) | |
359 | 2221 && (cstack->cs_flags[idx] & CSF_SILENT)) |
7 | 2222 { |
2223 eslist_T *elem; | |
2224 | |
2225 elem = cstack->cs_emsg_silent_list; | |
2226 cstack->cs_emsg_silent_list = elem->next; | |
2227 emsg_silent = elem->saved_emsg_silent; | |
2228 vim_free(elem); | |
2229 cstack->cs_flags[idx] &= ~CSF_SILENT; | |
2230 } | |
2231 if (stop) | |
2232 break; | |
2233 } | |
2234 return idx; | |
2235 } | |
2236 | |
2237 /* | |
75 | 2238 * Return an appropriate error message for a missing endwhile/endfor/endif. |
2239 */ | |
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2240 static char * |
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2241 get_end_emsg(cstack_T *cstack) |
75 | 2242 { |
2243 if (cstack->cs_flags[cstack->cs_idx] & CSF_WHILE) | |
2244 return e_endwhile; | |
2245 if (cstack->cs_flags[cstack->cs_idx] & CSF_FOR) | |
2246 return e_endfor; | |
2247 return e_endif; | |
2248 } | |
2249 | |
2250 | |
2251 /* | |
7 | 2252 * Rewind conditionals until index "idx" is reached. "cond_type" and |
2253 * "cond_level" specify a conditional type and the address of a level variable | |
2254 * which is to be decremented with each skipped conditional of the specified | |
2255 * type. | |
79 | 2256 * Also free "for info" structures where needed. |
7 | 2257 */ |
79 | 2258 void |
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2259 rewind_conditionals( |
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2260 cstack_T *cstack, |
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2261 int idx, |
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2262 int cond_type, |
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2263 int *cond_level) |
7 | 2264 { |
2265 while (cstack->cs_idx > idx) | |
2266 { | |
2267 if (cstack->cs_flags[cstack->cs_idx] & cond_type) | |
2268 --*cond_level; | |
79 | 2269 if (cstack->cs_flags[cstack->cs_idx] & CSF_FOR) |
2270 free_for_info(cstack->cs_forinfo[cstack->cs_idx]); | |
7 | 2271 --cstack->cs_idx; |
2272 } | |
2273 } | |
2274 | |
2275 /* | |
2276 * ":endfunction" when not after a ":function" | |
2277 */ | |
2278 void | |
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2279 ex_endfunction(exarg_T *eap) |
7 | 2280 { |
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2281 if (eap->cmdidx == CMD_enddef) |
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2282 emsg(_("E193: :enddef not inside a function")); |
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2283 else |
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2284 emsg(_("E193: :endfunction not inside a function")); |
7 | 2285 } |
2286 | |
2287 /* | |
75 | 2288 * Return TRUE if the string "p" looks like a ":while" or ":for" command. |
7 | 2289 */ |
2290 int | |
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2291 has_loop_cmd(char_u *p) |
7 | 2292 { |
1447 | 2293 int len; |
2294 | |
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2295 // skip modifiers, white space and ':' |
1447 | 2296 for (;;) |
2297 { | |
2298 while (*p == ' ' || *p == '\t' || *p == ':') | |
2299 ++p; | |
2300 len = modifier_len(p); | |
2301 if (len == 0) | |
2302 break; | |
2303 p += len; | |
2304 } | |
75 | 2305 if ((p[0] == 'w' && p[1] == 'h') |
2306 || (p[0] == 'f' && p[1] == 'o' && p[2] == 'r')) | |
7 | 2307 return TRUE; |
2308 return FALSE; | |
2309 } | |
2310 | |
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2311 #endif // FEAT_EVAL |