Commit | Line | Data |
---|---|---|
c5f0f3d0 | 1 | /* Line completion stuff for GDB, the GNU debugger. |
b6ba6518 | 2 | Copyright 2000, 2001 Free Software Foundation, Inc. |
c5f0f3d0 FN |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "defs.h" | |
22 | #include "symtab.h" | |
23 | #include "gdbtypes.h" | |
24 | #include "expression.h" | |
c94fdfd0 | 25 | #include "filenames.h" /* for DOSish file names */ |
c5f0f3d0 FN |
26 | |
27 | /* FIXME: This is needed because of lookup_cmd_1(). | |
28 | We should be calling a hook instead so we eliminate the CLI dependency. */ | |
29 | #include "gdbcmd.h" | |
30 | ||
c94fdfd0 EZ |
31 | /* Needed for rl_completer_word_break_characters() and for |
32 | filename_completion_function. */ | |
c5f0f3d0 FN |
33 | #include <readline/readline.h> |
34 | ||
35 | /* readline defines this. */ | |
36 | #undef savestring | |
37 | ||
38 | #include "completer.h" | |
39 | ||
40 | /* Prototypes for local functions */ | |
d75b5104 EZ |
41 | char *line_completion_function (char *text, int matches, char *line_buffer, |
42 | int point); | |
c5f0f3d0 FN |
43 | |
44 | /* readline uses the word breaks for two things: | |
45 | (1) In figuring out where to point the TEXT parameter to the | |
46 | rl_completion_entry_function. Since we don't use TEXT for much, | |
47 | it doesn't matter a lot what the word breaks are for this purpose, but | |
48 | it does affect how much stuff M-? lists. | |
49 | (2) If one of the matches contains a word break character, readline | |
50 | will quote it. That's why we switch between | |
51 | gdb_completer_word_break_characters and | |
52 | gdb_completer_command_word_break_characters. I'm not sure when | |
53 | we need this behavior (perhaps for funky characters in C++ symbols?). */ | |
54 | ||
55 | /* Variables which are necessary for fancy command line editing. */ | |
56 | static char *gdb_completer_word_break_characters = | |
57 | " \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,-"; | |
58 | ||
59 | /* When completing on command names, we remove '-' from the list of | |
60 | word break characters, since we use it in command names. If the | |
61 | readline library sees one in any of the current completion strings, | |
62 | it thinks that the string needs to be quoted and automatically supplies | |
63 | a leading quote. */ | |
64 | static char *gdb_completer_command_word_break_characters = | |
65 | " \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,"; | |
66 | ||
67 | /* When completing on file names, we remove from the list of word | |
68 | break characters any characters that are commonly used in file | |
69 | names, such as '-', '+', '~', etc. Otherwise, readline displays | |
70 | incorrect completion candidates. */ | |
c3690141 | 71 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM |
7830cf6f EZ |
72 | /* MS-DOS and MS-Windows use colon as part of the drive spec, and most |
73 | programs support @foo style response files. */ | |
74 | static char *gdb_completer_file_name_break_characters = " \t\n*|\"';?><@"; | |
75 | #else | |
76 | static char *gdb_completer_file_name_break_characters = " \t\n*|\"';:?><"; | |
77 | #endif | |
c5f0f3d0 | 78 | |
c94fdfd0 EZ |
79 | /* These are used when completing on locations, which can mix file |
80 | names and symbol names separated by a colon. */ | |
81 | static char *gdb_completer_loc_break_characters = " \t\n*|\"';:?><,"; | |
82 | ||
c5f0f3d0 FN |
83 | /* Characters that can be used to quote completion strings. Note that we |
84 | can't include '"' because the gdb C parser treats such quoted sequences | |
85 | as strings. */ | |
86 | static char *gdb_completer_quote_characters = "'"; | |
87 | \f | |
88 | /* Accessor for some completer data that may interest other files. */ | |
89 | ||
90 | char * | |
91 | get_gdb_completer_word_break_characters (void) | |
92 | { | |
93 | return gdb_completer_word_break_characters; | |
94 | } | |
95 | ||
96 | char * | |
97 | get_gdb_completer_quote_characters (void) | |
98 | { | |
99 | return gdb_completer_quote_characters; | |
100 | } | |
101 | ||
d75b5104 EZ |
102 | /* Line completion interface function for readline. */ |
103 | ||
104 | char * | |
105 | readline_line_completion_function (char *text, int matches) | |
106 | { | |
107 | return line_completion_function (text, matches, rl_line_buffer, rl_point); | |
108 | } | |
109 | ||
110 | /* This can be used for functions which don't want to complete on symbols | |
111 | but don't want to complete on anything else either. */ | |
112 | char ** | |
113 | noop_completer (char *text, char *prefix) | |
114 | { | |
115 | return NULL; | |
116 | } | |
117 | ||
c5f0f3d0 FN |
118 | /* Complete on filenames. */ |
119 | char ** | |
120 | filename_completer (char *text, char *word) | |
121 | { | |
c5f0f3d0 FN |
122 | int subsequent_name; |
123 | char **return_val; | |
124 | int return_val_used; | |
125 | int return_val_alloced; | |
126 | ||
127 | return_val_used = 0; | |
128 | /* Small for testing. */ | |
129 | return_val_alloced = 1; | |
130 | return_val = (char **) xmalloc (return_val_alloced * sizeof (char *)); | |
131 | ||
132 | subsequent_name = 0; | |
133 | while (1) | |
134 | { | |
135 | char *p; | |
136 | p = filename_completion_function (text, subsequent_name); | |
137 | if (return_val_used >= return_val_alloced) | |
138 | { | |
139 | return_val_alloced *= 2; | |
140 | return_val = | |
141 | (char **) xrealloc (return_val, | |
142 | return_val_alloced * sizeof (char *)); | |
143 | } | |
144 | if (p == NULL) | |
145 | { | |
146 | return_val[return_val_used++] = p; | |
147 | break; | |
148 | } | |
149 | /* We need to set subsequent_name to a non-zero value before the | |
150 | continue line below, because otherwise, if the first file seen | |
151 | by GDB is a backup file whose name ends in a `~', we will loop | |
152 | indefinitely. */ | |
153 | subsequent_name = 1; | |
154 | /* Like emacs, don't complete on old versions. Especially useful | |
155 | in the "source" command. */ | |
156 | if (p[strlen (p) - 1] == '~') | |
157 | continue; | |
158 | ||
159 | { | |
160 | char *q; | |
161 | if (word == text) | |
162 | /* Return exactly p. */ | |
163 | return_val[return_val_used++] = p; | |
164 | else if (word > text) | |
165 | { | |
166 | /* Return some portion of p. */ | |
167 | q = xmalloc (strlen (p) + 5); | |
168 | strcpy (q, p + (word - text)); | |
169 | return_val[return_val_used++] = q; | |
b8c9b27d | 170 | xfree (p); |
c5f0f3d0 FN |
171 | } |
172 | else | |
173 | { | |
174 | /* Return some of TEXT plus p. */ | |
175 | q = xmalloc (strlen (p) + (text - word) + 5); | |
176 | strncpy (q, word, text - word); | |
177 | q[text - word] = '\0'; | |
178 | strcat (q, p); | |
179 | return_val[return_val_used++] = q; | |
b8c9b27d | 180 | xfree (p); |
c5f0f3d0 FN |
181 | } |
182 | } | |
183 | } | |
184 | #if 0 | |
185 | /* There is no way to do this just long enough to affect quote inserting | |
186 | without also affecting the next completion. This should be fixed in | |
187 | readline. FIXME. */ | |
188 | /* Insure that readline does the right thing | |
189 | with respect to inserting quotes. */ | |
190 | rl_completer_word_break_characters = ""; | |
191 | #endif | |
192 | return return_val; | |
193 | } | |
194 | ||
c94fdfd0 EZ |
195 | /* Complete on locations, which might be of two possible forms: |
196 | ||
197 | file:line | |
198 | or | |
199 | symbol+offset | |
200 | ||
201 | This is intended to be used in commands that set breakpoints etc. */ | |
202 | char ** | |
203 | location_completer (char *text, char *word) | |
204 | { | |
205 | int n_syms = 0, n_files = 0; | |
206 | char ** fn_list = NULL; | |
207 | char ** list = NULL; | |
208 | char *p; | |
209 | int quote_found = 0; | |
210 | int quoted = *text == '\'' || *text == '"'; | |
211 | int quote_char = '\0'; | |
212 | char *colon = NULL; | |
213 | char *file_to_match = NULL; | |
214 | char *symbol_start = text; | |
215 | char *orig_text = text; | |
216 | size_t text_len; | |
217 | ||
218 | /* Do we have an unquoted colon, as in "break foo.c::bar"? */ | |
219 | for (p = text; *p != '\0'; ++p) | |
220 | { | |
221 | if (*p == '\\' && p[1] == '\'') | |
222 | p++; | |
223 | else if (*p == '\'' || *p == '"') | |
224 | { | |
225 | quote_found = *p; | |
226 | quote_char = *p++; | |
227 | while (*p != '\0' && *p != quote_found) | |
228 | { | |
229 | if (*p == '\\' && p[1] == quote_found) | |
230 | p++; | |
231 | p++; | |
232 | } | |
233 | ||
234 | if (*p == quote_found) | |
235 | quote_found = 0; | |
236 | else | |
237 | break; /* hit the end of text */ | |
238 | } | |
239 | #if HAVE_DOS_BASED_FILE_SYSTEM | |
240 | /* If we have a DOS-style absolute file name at the beginning of | |
241 | TEXT, and the colon after the drive letter is the only colon | |
242 | we found, pretend the colon is not there. */ | |
243 | else if (p < text + 3 && *p == ':' && p == text + 1 + quoted) | |
244 | ; | |
245 | #endif | |
246 | else if (*p == ':' && !colon) | |
247 | { | |
248 | colon = p; | |
249 | symbol_start = p + 1; | |
250 | } | |
251 | else if (strchr (gdb_completer_word_break_characters, *p)) | |
252 | symbol_start = p + 1; | |
253 | } | |
254 | ||
255 | if (quoted) | |
256 | text++; | |
257 | text_len = strlen (text); | |
258 | ||
259 | /* Where is the file name? */ | |
260 | if (colon) | |
261 | { | |
262 | char *s; | |
263 | ||
264 | file_to_match = (char *) xmalloc (colon - text + 1); | |
265 | strncpy (file_to_match, text, colon - text + 1); | |
266 | /* Remove trailing colons and quotes from the file name. */ | |
267 | for (s = file_to_match + (colon - text); | |
268 | s > file_to_match; | |
269 | s--) | |
270 | if (*s == ':' || *s == quote_char) | |
271 | *s = '\0'; | |
272 | } | |
273 | /* If the text includes a colon, they want completion only on a | |
274 | symbol name after the colon. Otherwise, we need to complete on | |
275 | symbols as well as on files. */ | |
276 | if (colon) | |
277 | { | |
278 | list = make_file_symbol_completion_list (symbol_start, word, | |
279 | file_to_match); | |
280 | xfree (file_to_match); | |
281 | } | |
282 | else | |
283 | { | |
284 | list = make_symbol_completion_list (symbol_start, word); | |
285 | /* If text includes characters which cannot appear in a file | |
286 | name, they cannot be asking for completion on files. */ | |
287 | if (strcspn (text, gdb_completer_file_name_break_characters) == text_len) | |
288 | fn_list = make_source_files_completion_list (text, text); | |
289 | } | |
290 | ||
291 | /* How many completions do we have in both lists? */ | |
292 | if (fn_list) | |
293 | for ( ; fn_list[n_files]; n_files++) | |
294 | ; | |
295 | if (list) | |
296 | for ( ; list[n_syms]; n_syms++) | |
297 | ; | |
298 | ||
299 | /* Make list[] large enough to hold both lists, then catenate | |
300 | fn_list[] onto the end of list[]. */ | |
301 | if (n_syms && n_files) | |
302 | { | |
303 | list = xrealloc (list, (n_syms + n_files + 1) * sizeof (char *)); | |
304 | memcpy (list + n_syms, fn_list, (n_files + 1) * sizeof (char *)); | |
305 | xfree (fn_list); | |
306 | } | |
307 | else if (n_files) | |
308 | { | |
309 | /* If we only have file names as possible completion, we should | |
310 | bring them in sync with what rl_complete expects. The | |
311 | problem is that if the user types "break /foo/b TAB", and the | |
312 | possible completions are "/foo/bar" and "/foo/baz" | |
313 | rl_complete expects us to return "bar" and "baz", without the | |
314 | leading directories, as possible completions, because `word' | |
315 | starts at the "b". But we ignore the value of `word' when we | |
316 | call make_source_files_completion_list above (because that | |
317 | would not DTRT when the completion results in both symbols | |
318 | and file names), so make_source_files_completion_list returns | |
319 | the full "/foo/bar" and "/foo/baz" strings. This produces | |
320 | wrong results when, e.g., there's only one possible | |
321 | completion, because rl_complete will prepend "/foo/" to each | |
322 | candidate completion. The loop below removes that leading | |
323 | part. */ | |
324 | for (n_files = 0; fn_list[n_files]; n_files++) | |
325 | { | |
326 | memmove (fn_list[n_files], fn_list[n_files] + (word - text), | |
327 | strlen (fn_list[n_files]) + 1 - (word - text)); | |
328 | } | |
329 | /* Return just the file-name list as the result. */ | |
330 | list = fn_list; | |
331 | } | |
332 | else if (!n_syms) | |
333 | { | |
334 | /* No completions at all. As the final resort, try completing | |
335 | on the entire text as a symbol. */ | |
336 | list = make_symbol_completion_list (orig_text, word); | |
337 | } | |
338 | ||
339 | return list; | |
340 | } | |
341 | ||
db60ec62 EZ |
342 | /* Complete on command names. Used by "help". */ |
343 | char ** | |
344 | command_completer (char *text, char *word) | |
345 | { | |
346 | return complete_on_cmdlist (cmdlist, text, word); | |
347 | } | |
348 | ||
349 | ||
c5f0f3d0 FN |
350 | /* Here are some useful test cases for completion. FIXME: These should |
351 | be put in the test suite. They should be tested with both M-? and TAB. | |
352 | ||
353 | "show output-" "radix" | |
354 | "show output" "-radix" | |
355 | "p" ambiguous (commands starting with p--path, print, printf, etc.) | |
356 | "p " ambiguous (all symbols) | |
357 | "info t foo" no completions | |
358 | "info t " no completions | |
359 | "info t" ambiguous ("info target", "info terminal", etc.) | |
360 | "info ajksdlfk" no completions | |
361 | "info ajksdlfk " no completions | |
362 | "info" " " | |
363 | "info " ambiguous (all info commands) | |
364 | "p \"a" no completions (string constant) | |
365 | "p 'a" ambiguous (all symbols starting with a) | |
366 | "p b-a" ambiguous (all symbols starting with a) | |
367 | "p b-" ambiguous (all symbols) | |
368 | "file Make" "file" (word break hard to screw up here) | |
369 | "file ../gdb.stabs/we" "ird" (needs to not break word at slash) | |
370 | */ | |
371 | ||
83d31a92 TT |
372 | /* Generate completions all at once. Returns a NULL-terminated array |
373 | of strings. Both the array and each element are allocated with | |
374 | xmalloc. It can also return NULL if there are no completions. | |
c5f0f3d0 FN |
375 | |
376 | TEXT is the caller's idea of the "word" we are looking at. | |
377 | ||
c5f0f3d0 FN |
378 | LINE_BUFFER is available to be looked at; it contains the entire text |
379 | of the line. POINT is the offset in that line of the cursor. You | |
83d31a92 | 380 | should pretend that the line ends at POINT. */ |
c5f0f3d0 | 381 | |
83d31a92 TT |
382 | char ** |
383 | complete_line (char *text, char *line_buffer, int point) | |
c5f0f3d0 | 384 | { |
83d31a92 | 385 | char **list = NULL; |
c5f0f3d0 FN |
386 | char *tmp_command, *p; |
387 | /* Pointer within tmp_command which corresponds to text. */ | |
388 | char *word; | |
389 | struct cmd_list_element *c, *result_list; | |
390 | ||
83d31a92 TT |
391 | /* Choose the default set of word break characters to break completions. |
392 | If we later find out that we are doing completions on command strings | |
393 | (as opposed to strings supplied by the individual command completer | |
394 | functions, which can be any string) then we will switch to the | |
395 | special word break set for command strings, which leaves out the | |
396 | '-' character used in some commands. */ | |
c5f0f3d0 | 397 | |
83d31a92 TT |
398 | rl_completer_word_break_characters = |
399 | gdb_completer_word_break_characters; | |
c5f0f3d0 FN |
400 | |
401 | /* Decide whether to complete on a list of gdb commands or on symbols. */ | |
83d31a92 TT |
402 | tmp_command = (char *) alloca (point + 1); |
403 | p = tmp_command; | |
c5f0f3d0 | 404 | |
83d31a92 TT |
405 | strncpy (tmp_command, line_buffer, point); |
406 | tmp_command[point] = '\0'; | |
407 | /* Since text always contains some number of characters leading up | |
408 | to point, we can find the equivalent position in tmp_command | |
409 | by subtracting that many characters from the end of tmp_command. */ | |
410 | word = tmp_command + point - strlen (text); | |
c5f0f3d0 | 411 | |
83d31a92 TT |
412 | if (point == 0) |
413 | { | |
414 | /* An empty line we want to consider ambiguous; that is, it | |
415 | could be any command. */ | |
416 | c = (struct cmd_list_element *) -1; | |
417 | result_list = 0; | |
418 | } | |
419 | else | |
420 | { | |
421 | c = lookup_cmd_1 (&p, cmdlist, &result_list, 1); | |
422 | } | |
c5f0f3d0 | 423 | |
83d31a92 TT |
424 | /* Move p up to the next interesting thing. */ |
425 | while (*p == ' ' || *p == '\t') | |
426 | { | |
427 | p++; | |
428 | } | |
c5f0f3d0 | 429 | |
83d31a92 TT |
430 | if (!c) |
431 | { | |
432 | /* It is an unrecognized command. So there are no | |
433 | possible completions. */ | |
434 | list = NULL; | |
435 | } | |
436 | else if (c == (struct cmd_list_element *) -1) | |
437 | { | |
438 | char *q; | |
439 | ||
440 | /* lookup_cmd_1 advances p up to the first ambiguous thing, but | |
441 | doesn't advance over that thing itself. Do so now. */ | |
442 | q = p; | |
443 | while (*q && (isalnum (*q) || *q == '-' || *q == '_')) | |
444 | ++q; | |
445 | if (q != tmp_command + point) | |
c5f0f3d0 | 446 | { |
83d31a92 TT |
447 | /* There is something beyond the ambiguous |
448 | command, so there are no possible completions. For | |
449 | example, "info t " or "info t foo" does not complete | |
450 | to anything, because "info t" can be "info target" or | |
451 | "info terminal". */ | |
c5f0f3d0 FN |
452 | list = NULL; |
453 | } | |
83d31a92 | 454 | else |
c5f0f3d0 | 455 | { |
83d31a92 TT |
456 | /* We're trying to complete on the command which was ambiguous. |
457 | This we can deal with. */ | |
458 | if (result_list) | |
c5f0f3d0 | 459 | { |
83d31a92 TT |
460 | list = complete_on_cmdlist (*result_list->prefixlist, p, |
461 | word); | |
c5f0f3d0 FN |
462 | } |
463 | else | |
464 | { | |
83d31a92 | 465 | list = complete_on_cmdlist (cmdlist, p, word); |
c5f0f3d0 | 466 | } |
83d31a92 TT |
467 | /* Insure that readline does the right thing with respect to |
468 | inserting quotes. */ | |
469 | rl_completer_word_break_characters = | |
470 | gdb_completer_command_word_break_characters; | |
c5f0f3d0 | 471 | } |
83d31a92 TT |
472 | } |
473 | else | |
474 | { | |
475 | /* We've recognized a full command. */ | |
476 | ||
477 | if (p == tmp_command + point) | |
c5f0f3d0 | 478 | { |
83d31a92 | 479 | /* There is no non-whitespace in the line beyond the command. */ |
c5f0f3d0 | 480 | |
83d31a92 | 481 | if (p[-1] == ' ' || p[-1] == '\t') |
c5f0f3d0 | 482 | { |
83d31a92 TT |
483 | /* The command is followed by whitespace; we need to complete |
484 | on whatever comes after command. */ | |
485 | if (c->prefixlist) | |
c5f0f3d0 | 486 | { |
83d31a92 TT |
487 | /* It is a prefix command; what comes after it is |
488 | a subcommand (e.g. "info "). */ | |
489 | list = complete_on_cmdlist (*c->prefixlist, p, word); | |
c5f0f3d0 FN |
490 | |
491 | /* Insure that readline does the right thing | |
83d31a92 | 492 | with respect to inserting quotes. */ |
c5f0f3d0 FN |
493 | rl_completer_word_break_characters = |
494 | gdb_completer_command_word_break_characters; | |
495 | } | |
c5f0f3d0 FN |
496 | else if (c->enums) |
497 | { | |
498 | list = complete_on_enum (c->enums, p, word); | |
83d31a92 TT |
499 | rl_completer_word_break_characters = |
500 | gdb_completer_command_word_break_characters; | |
c5f0f3d0 FN |
501 | } |
502 | else | |
503 | { | |
83d31a92 TT |
504 | /* It is a normal command; what comes after it is |
505 | completed by the command's completer function. */ | |
c5f0f3d0 | 506 | if (c->completer == filename_completer) |
7830cf6f | 507 | { |
83d31a92 TT |
508 | /* Many commands which want to complete on |
509 | file names accept several file names, as | |
510 | in "run foo bar >>baz". So we don't want | |
511 | to complete the entire text after the | |
512 | command, just the last word. To this | |
513 | end, we need to find the beginning of the | |
514 | file name by starting at `word' and going | |
515 | backwards. */ | |
7830cf6f EZ |
516 | for (p = word; |
517 | p > tmp_command | |
518 | && strchr (gdb_completer_file_name_break_characters, p[-1]) == NULL; | |
519 | p--) | |
520 | ; | |
521 | rl_completer_word_break_characters = | |
522 | gdb_completer_file_name_break_characters; | |
523 | } | |
c94fdfd0 EZ |
524 | else if (c->completer == location_completer) |
525 | { | |
83d31a92 TT |
526 | /* Commands which complete on locations want to |
527 | see the entire argument. */ | |
c94fdfd0 EZ |
528 | for (p = word; |
529 | p > tmp_command | |
530 | && p[-1] != ' ' && p[-1] != '\t'; | |
531 | p--) | |
532 | ; | |
533 | } | |
7830cf6f | 534 | list = (*c->completer) (p, word); |
c5f0f3d0 FN |
535 | } |
536 | } | |
83d31a92 TT |
537 | else |
538 | { | |
539 | /* The command is not followed by whitespace; we need to | |
540 | complete on the command itself. e.g. "p" which is a | |
541 | command itself but also can complete to "print", "ptype" | |
542 | etc. */ | |
543 | char *q; | |
544 | ||
545 | /* Find the command we are completing on. */ | |
546 | q = p; | |
547 | while (q > tmp_command) | |
548 | { | |
549 | if (isalnum (q[-1]) || q[-1] == '-' || q[-1] == '_') | |
550 | --q; | |
551 | else | |
552 | break; | |
553 | } | |
554 | ||
555 | list = complete_on_cmdlist (result_list, q, word); | |
556 | ||
557 | /* Insure that readline does the right thing | |
558 | with respect to inserting quotes. */ | |
559 | rl_completer_word_break_characters = | |
560 | gdb_completer_command_word_break_characters; | |
561 | } | |
562 | } | |
563 | else | |
564 | { | |
565 | /* There is non-whitespace beyond the command. */ | |
566 | ||
567 | if (c->prefixlist && !c->allow_unknown) | |
568 | { | |
569 | /* It is an unrecognized subcommand of a prefix command, | |
570 | e.g. "info adsfkdj". */ | |
571 | list = NULL; | |
572 | } | |
573 | else if (c->enums) | |
574 | { | |
575 | list = complete_on_enum (c->enums, p, word); | |
576 | } | |
577 | else | |
578 | { | |
579 | /* It is a normal command. */ | |
580 | if (c->completer == filename_completer) | |
581 | { | |
582 | /* See the commentary above about the specifics | |
583 | of file-name completion. */ | |
584 | for (p = word; | |
585 | p > tmp_command | |
586 | && strchr (gdb_completer_file_name_break_characters, p[-1]) == NULL; | |
587 | p--) | |
588 | ; | |
589 | rl_completer_word_break_characters = | |
590 | gdb_completer_file_name_break_characters; | |
591 | } | |
592 | else if (c->completer == location_completer) | |
593 | { | |
594 | for (p = word; | |
595 | p > tmp_command | |
596 | && p[-1] != ' ' && p[-1] != '\t'; | |
597 | p--) | |
598 | ; | |
599 | } | |
600 | list = (*c->completer) (p, word); | |
601 | } | |
602 | } | |
603 | } | |
604 | ||
605 | return list; | |
606 | } | |
607 | ||
608 | /* Generate completions one by one for the completer. Each time we are | |
609 | called return another potential completion to the caller. | |
610 | line_completion just completes on commands or passes the buck to the | |
611 | command's completer function, the stuff specific to symbol completion | |
612 | is in make_symbol_completion_list. | |
613 | ||
614 | TEXT is the caller's idea of the "word" we are looking at. | |
615 | ||
616 | MATCHES is the number of matches that have currently been collected from | |
617 | calling this completion function. When zero, then we need to initialize, | |
618 | otherwise the initialization has already taken place and we can just | |
619 | return the next potential completion string. | |
620 | ||
621 | LINE_BUFFER is available to be looked at; it contains the entire text | |
622 | of the line. POINT is the offset in that line of the cursor. You | |
623 | should pretend that the line ends at POINT. | |
624 | ||
625 | Returns NULL if there are no more completions, else a pointer to a string | |
626 | which is a possible completion, it is the caller's responsibility to | |
627 | free the string. */ | |
628 | ||
629 | char * | |
630 | line_completion_function (char *text, int matches, char *line_buffer, int point) | |
631 | { | |
632 | static char **list = (char **) NULL; /* Cache of completions */ | |
633 | static int index; /* Next cached completion */ | |
634 | char *output = NULL; | |
635 | ||
636 | if (matches == 0) | |
637 | { | |
638 | /* The caller is beginning to accumulate a new set of completions, so | |
639 | we need to find all of them now, and cache them for returning one at | |
640 | a time on future calls. */ | |
641 | ||
642 | if (list) | |
643 | { | |
644 | /* Free the storage used by LIST, but not by the strings inside. | |
645 | This is because rl_complete_internal () frees the strings. */ | |
646 | xfree (list); | |
c5f0f3d0 | 647 | } |
83d31a92 TT |
648 | index = 0; |
649 | list = complete_line (text, line_buffer, point); | |
c5f0f3d0 FN |
650 | } |
651 | ||
652 | /* If we found a list of potential completions during initialization then | |
653 | dole them out one at a time. The vector of completions is NULL | |
654 | terminated, so after returning the last one, return NULL (and continue | |
655 | to do so) each time we are called after that, until a new list is | |
656 | available. */ | |
657 | ||
658 | if (list) | |
659 | { | |
660 | output = list[index]; | |
661 | if (output) | |
662 | { | |
663 | index++; | |
664 | } | |
665 | } | |
666 | ||
667 | #if 0 | |
668 | /* Can't do this because readline hasn't yet checked the word breaks | |
669 | for figuring out whether to insert a quote. */ | |
670 | if (output == NULL) | |
671 | /* Make sure the word break characters are set back to normal for the | |
672 | next time that readline tries to complete something. */ | |
673 | rl_completer_word_break_characters = | |
674 | gdb_completer_word_break_characters; | |
675 | #endif | |
676 | ||
677 | return (output); | |
678 | } | |
679 | /* Skip over a possibly quoted word (as defined by the quote characters | |
680 | and word break characters the completer uses). Returns pointer to the | |
681 | location after the "word". */ | |
682 | ||
683 | char * | |
684 | skip_quoted (char *str) | |
685 | { | |
686 | char quote_char = '\0'; | |
687 | char *scan; | |
688 | ||
689 | for (scan = str; *scan != '\0'; scan++) | |
690 | { | |
691 | if (quote_char != '\0') | |
692 | { | |
693 | /* Ignore everything until the matching close quote char */ | |
694 | if (*scan == quote_char) | |
695 | { | |
696 | /* Found matching close quote. */ | |
697 | scan++; | |
698 | break; | |
699 | } | |
700 | } | |
701 | else if (strchr (gdb_completer_quote_characters, *scan)) | |
702 | { | |
703 | /* Found start of a quoted string. */ | |
704 | quote_char = *scan; | |
705 | } | |
706 | else if (strchr (gdb_completer_word_break_characters, *scan)) | |
707 | { | |
708 | break; | |
709 | } | |
710 | } | |
711 | return (scan); | |
712 | } | |
713 |