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c5f0f3d0 | 1 | /* Header for GDB line completion. |
61baf725 | 2 | Copyright (C) 2000-2017 Free Software Foundation, Inc. |
c5f0f3d0 FN |
3 | |
4 | This program is free software; you can redistribute it and/or modify | |
5 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 6 | the Free Software Foundation; either version 3 of the License, or |
c5f0f3d0 FN |
7 | (at your option) any later version. |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c5f0f3d0 FN |
16 | |
17 | #if !defined (COMPLETER_H) | |
18 | #define COMPLETER_H 1 | |
19 | ||
49c4e619 | 20 | #include "gdb_vecs.h" |
7d793aa9 | 21 | #include "command.h" |
49c4e619 | 22 | |
82083d6d DE |
23 | /* Types of functions in struct match_list_displayer. */ |
24 | ||
25 | struct match_list_displayer; | |
26 | ||
27 | typedef void mld_crlf_ftype (const struct match_list_displayer *); | |
28 | typedef void mld_putch_ftype (const struct match_list_displayer *, int); | |
29 | typedef void mld_puts_ftype (const struct match_list_displayer *, | |
30 | const char *); | |
31 | typedef void mld_flush_ftype (const struct match_list_displayer *); | |
32 | typedef void mld_erase_entire_line_ftype (const struct match_list_displayer *); | |
33 | typedef void mld_beep_ftype (const struct match_list_displayer *); | |
34 | typedef int mld_read_key_ftype (const struct match_list_displayer *); | |
35 | ||
36 | /* Interface between CLI/TUI and gdb_match_list_displayer. */ | |
37 | ||
38 | struct match_list_displayer | |
39 | { | |
40 | /* The screen dimensions to work with when displaying matches. */ | |
41 | int height, width; | |
42 | ||
43 | /* Print cr,lf. */ | |
44 | mld_crlf_ftype *crlf; | |
45 | ||
46 | /* Not "putc" to avoid issues where it is a stdio macro. Sigh. */ | |
47 | mld_putch_ftype *putch; | |
48 | ||
49 | /* Print a string. */ | |
50 | mld_puts_ftype *puts; | |
51 | ||
52 | /* Flush all accumulated output. */ | |
53 | mld_flush_ftype *flush; | |
54 | ||
55 | /* Erase the currently line on the terminal (but don't discard any text the | |
56 | user has entered, readline may shortly re-print it). */ | |
57 | mld_erase_entire_line_ftype *erase_entire_line; | |
58 | ||
59 | /* Ring the bell. */ | |
60 | mld_beep_ftype *beep; | |
61 | ||
62 | /* Read one key. */ | |
63 | mld_read_key_ftype *read_key; | |
64 | }; | |
65 | ||
eb3ff9a5 PA |
66 | /* A list of completion candidates. Each element is a malloc string, |
67 | because ownership of the strings is transferred to readline, which | |
68 | calls free on each element. */ | |
69 | typedef std::vector<gdb::unique_xmalloc_ptr<char>> completion_list; | |
70 | ||
71 | /* The final result of a completion that is handed over to either | |
72 | readline or the "completion" command (which pretends to be | |
73 | readline). Mainly a wrapper for a readline-style match list array, | |
74 | though other bits of info are included too. */ | |
75 | ||
76 | struct completion_result | |
77 | { | |
78 | /* Create an empty result. */ | |
79 | completion_result (); | |
80 | ||
81 | /* Create a result. */ | |
82 | completion_result (char **match_list, size_t number_matches, | |
83 | bool completion_suppress_append); | |
84 | ||
85 | /* Destroy a result. */ | |
86 | ~completion_result (); | |
87 | ||
88 | /* Disable copying, since we don't need it. */ | |
89 | completion_result (const completion_result &rhs) = delete; | |
90 | void operator= (const completion_result &rhs) = delete; | |
91 | ||
92 | /* Move a result. */ | |
93 | completion_result (completion_result &&rhs); | |
94 | ||
95 | /* Release ownership of the match list array. */ | |
96 | char **release_match_list (); | |
97 | ||
98 | /* Sort the match list. */ | |
99 | void sort_match_list (); | |
100 | ||
101 | private: | |
102 | /* Destroy the match list array and its contents. */ | |
103 | void reset_match_list (); | |
104 | ||
105 | public: | |
106 | /* (There's no point in making these fields private, since the whole | |
107 | point of this wrapper is to build data in the layout expected by | |
108 | readline. Making them private would require adding getters for | |
109 | the "complete" command, which would expose the same | |
110 | implementation details anyway.) */ | |
111 | ||
112 | /* The match list array, in the format that readline expects. | |
113 | match_list[0] contains the common prefix. The real match list | |
114 | starts at index 1. The list is NULL terminated. If there's only | |
115 | one match, then match_list[1] is NULL. If there are no matches, | |
116 | then this is NULL. */ | |
117 | char **match_list; | |
118 | /* The number of matched completions in MATCH_LIST. Does not | |
119 | include the NULL terminator or the common prefix. */ | |
120 | size_t number_matches; | |
121 | ||
122 | /* Whether readline should suppress appending a whitespace, when | |
123 | there's only one possible completion. */ | |
124 | bool completion_suppress_append; | |
125 | }; | |
126 | ||
127 | /* Object used by completers to build a completion match list to hand | |
128 | over to readline. It tracks: | |
129 | ||
130 | - How many unique completions have been generated, to terminate | |
131 | completion list generation early if the list has grown to a size | |
132 | so large as to be useless. This helps avoid GDB seeming to lock | |
133 | up in the event the user requests to complete on something vague | |
134 | that necessitates the time consuming expansion of many symbol | |
135 | tables. | |
c6756f62 PA |
136 | |
137 | - The custom word point to hand over to readline, for completers | |
138 | that parse the input string in order to dynamically adjust | |
139 | themselves depending on exactly what they're completing. E.g., | |
140 | the linespec completer needs to bypass readline's too-simple word | |
141 | breaking algorithm. | |
eb3ff9a5 PA |
142 | */ |
143 | class completion_tracker | |
144 | { | |
145 | public: | |
146 | completion_tracker (); | |
147 | ~completion_tracker (); | |
148 | ||
149 | /* Disable copy. */ | |
150 | completion_tracker (const completion_tracker &rhs) = delete; | |
151 | void operator= (const completion_tracker &rhs) = delete; | |
152 | ||
153 | /* Add the completion NAME to the list of generated completions if | |
154 | it is not there already. If too many completions were already | |
155 | found, this throws an error. */ | |
156 | void add_completion (gdb::unique_xmalloc_ptr<char> name); | |
157 | ||
158 | /* Add all completions matches in LIST. Elements are moved out of | |
159 | LIST. */ | |
160 | void add_completions (completion_list &&list); | |
161 | ||
c6756f62 PA |
162 | /* Set the quote char to be appended after a unique completion is |
163 | added to the input line. Set to '\0' to clear. See | |
164 | m_quote_char's description. */ | |
165 | void set_quote_char (int quote_char) | |
166 | { m_quote_char = quote_char; } | |
167 | ||
168 | /* The quote char to be appended after a unique completion is added | |
169 | to the input line. Returns '\0' if no quote char has been set. | |
170 | See m_quote_char's description. */ | |
171 | int quote_char () { return m_quote_char; } | |
172 | ||
173 | /* Tell the tracker that the current completer wants to provide a | |
174 | custom word point instead of a list of a break chars, in the | |
175 | handle_brkchars phase. Such completers must also compute their | |
176 | completions then. */ | |
177 | void set_use_custom_word_point (bool enable) | |
178 | { m_use_custom_word_point = enable; } | |
179 | ||
180 | /* Whether the current completer computes a custom word point. */ | |
181 | bool use_custom_word_point () const | |
182 | { return m_use_custom_word_point; } | |
183 | ||
184 | /* The custom word point. */ | |
185 | int custom_word_point () const | |
186 | { return m_custom_word_point; } | |
187 | ||
188 | /* Set the custom word point to POINT. */ | |
189 | void set_custom_word_point (int point) | |
190 | { m_custom_word_point = point; } | |
191 | ||
192 | /* Advance the custom word point by LEN. */ | |
193 | void advance_custom_word_point_by (size_t len); | |
194 | ||
195 | /* Return true if we only have one completion, and it matches | |
196 | exactly the completion word. I.e., completing results in what we | |
197 | already have. */ | |
198 | bool completes_to_completion_word (const char *word); | |
199 | ||
eb3ff9a5 PA |
200 | /* True if we have any completion match recorded. */ |
201 | bool have_completions () const | |
202 | { return !m_entries_vec.empty (); } | |
203 | ||
c6756f62 PA |
204 | /* Discard the current completion match list and the current |
205 | LCD. */ | |
206 | void discard_completions (); | |
207 | ||
eb3ff9a5 PA |
208 | /* Build a completion_result containing the list of completion |
209 | matches to hand over to readline. The parameters are as in | |
210 | rl_attempted_completion_function. */ | |
211 | completion_result build_completion_result (const char *text, | |
212 | int start, int end); | |
213 | ||
214 | private: | |
215 | ||
216 | /* Add the completion NAME to the list of generated completions if | |
217 | it is not there already. If false is returned, too many | |
218 | completions were found. */ | |
219 | bool maybe_add_completion (gdb::unique_xmalloc_ptr<char> name); | |
220 | ||
221 | /* Given a new match, recompute the lowest common denominator (LCD) | |
222 | to hand over to readline. */ | |
223 | void recompute_lowest_common_denominator (const char *new_match); | |
224 | ||
225 | /* The completion matches found so far, in a vector. */ | |
226 | completion_list m_entries_vec; | |
227 | ||
228 | /* The completion matches found so far, in a hash table, for | |
229 | duplicate elimination as entries are added. Otherwise the user | |
230 | is left scratching his/her head: readline and complete_command | |
231 | will remove duplicates, and if removal of duplicates there brings | |
232 | the total under max_completions the user may think gdb quit | |
233 | searching too early. */ | |
234 | htab_t m_entries_hash; | |
235 | ||
c6756f62 PA |
236 | /* If non-zero, then this is the quote char that needs to be |
237 | appended after completion (iff we have a unique completion). We | |
238 | don't rely on readline appending the quote char as delimiter as | |
239 | then readline wouldn't append the ' ' after the completion. | |
240 | I.e., we want this: | |
241 | ||
242 | before tab: "b 'function(" | |
243 | after tab: "b 'function()' " | |
244 | */ | |
245 | int m_quote_char = '\0'; | |
246 | ||
247 | /* If true, the completer has its own idea of "word" point, and | |
248 | doesn't want to rely on readline computing it based on brkchars. | |
249 | Set in the handle_brkchars phase. */ | |
250 | bool m_use_custom_word_point = false; | |
251 | ||
252 | /* The completer's idea of where the "word" we were looking at is | |
253 | relative to RL_LINE_BUFFER. This is advanced in the | |
254 | handle_brkchars phase as the completer discovers potential | |
255 | completable words. */ | |
256 | int m_custom_word_point = 0; | |
257 | ||
258 | /* Our idea of lowest common denominator to hand over to readline. | |
259 | See intro. */ | |
eb3ff9a5 PA |
260 | char *m_lowest_common_denominator = NULL; |
261 | ||
262 | /* If true, the LCD is unique. I.e., all completion candidates had | |
263 | the same string. */ | |
264 | bool m_lowest_common_denominator_unique = false; | |
265 | }; | |
266 | ||
82083d6d DE |
267 | extern void gdb_display_match_list (char **matches, int len, int max, |
268 | const struct match_list_displayer *); | |
269 | ||
ef0b411a GB |
270 | extern const char *get_max_completions_reached_message (void); |
271 | ||
eb3ff9a5 PA |
272 | extern void complete_line (completion_tracker &tracker, |
273 | const char *text, | |
274 | const char *line_buffer, | |
275 | int point); | |
83d31a92 | 276 | |
6a2c1b87 PA |
277 | /* Find the bounds of the word in TEXT for completion purposes, and |
278 | return a pointer to the end of the word. Calls the completion | |
279 | machinery for a handle_brkchars phase (using TRACKER) to figure out | |
280 | the right work break characters for the command in TEXT. | |
281 | QUOTE_CHAR, if non-null, is set to the opening quote character if | |
282 | we found an unclosed quoted substring, '\0' otherwise. */ | |
283 | extern const char *completion_find_completion_word (completion_tracker &tracker, | |
284 | const char *text, | |
285 | int *quote_char); | |
286 | ||
c6756f62 PA |
287 | |
288 | /* Assuming TEXT is an expression in the current language, find the | |
289 | completion word point for TEXT, emulating the algorithm readline | |
290 | uses to find the word point, using the current language's word | |
291 | break characters. */ | |
292 | ||
293 | const char *advance_to_expression_complete_word_point | |
294 | (completion_tracker &tracker, const char *text); | |
295 | ||
eb3ff9a5 PA |
296 | extern char **gdb_rl_attempted_completion_function (const char *text, |
297 | int start, int end); | |
d75b5104 | 298 | |
eb3ff9a5 PA |
299 | extern void noop_completer (struct cmd_list_element *, |
300 | completion_tracker &tracker, | |
301 | const char *, const char *); | |
d75b5104 | 302 | |
eb3ff9a5 PA |
303 | extern void filename_completer (struct cmd_list_element *, |
304 | completion_tracker &tracker, | |
305 | const char *, const char *); | |
c5f0f3d0 | 306 | |
eb3ff9a5 PA |
307 | extern void expression_completer (struct cmd_list_element *, |
308 | completion_tracker &tracker, | |
309 | const char *, const char *); | |
65d12d83 | 310 | |
eb3ff9a5 PA |
311 | extern void location_completer (struct cmd_list_element *, |
312 | completion_tracker &tracker, | |
313 | const char *, const char *); | |
c94fdfd0 | 314 | |
eb3ff9a5 PA |
315 | extern void symbol_completer (struct cmd_list_element *, |
316 | completion_tracker &tracker, | |
317 | const char *, const char *); | |
78b13106 | 318 | |
eb3ff9a5 PA |
319 | extern void command_completer (struct cmd_list_element *, |
320 | completion_tracker &tracker, | |
321 | const char *, const char *); | |
db60ec62 | 322 | |
eb3ff9a5 PA |
323 | extern void signal_completer (struct cmd_list_element *, |
324 | completion_tracker &tracker, | |
325 | const char *, const char *); | |
de0bea00 | 326 | |
eb3ff9a5 PA |
327 | extern void reg_or_group_completer (struct cmd_list_element *, |
328 | completion_tracker &tracker, | |
329 | const char *, const char *); | |
71c24708 | 330 | |
eb3ff9a5 PA |
331 | extern void reggroup_completer (struct cmd_list_element *, |
332 | completion_tracker &tracker, | |
333 | const char *, const char *); | |
51f0e40d | 334 | |
67cb5b2d | 335 | extern const char *get_gdb_completer_quote_characters (void); |
c5f0f3d0 | 336 | |
67c296a2 PM |
337 | extern char *gdb_completion_word_break_characters (void); |
338 | ||
67cb5b2d PA |
339 | /* Set the word break characters array to BREAK_CHARS. This function |
340 | is useful as const-correct alternative to direct assignment to | |
341 | rl_completer_word_break_characters, which is "char *", | |
342 | not "const char *". */ | |
343 | extern void set_rl_completer_word_break_characters (const char *break_chars); | |
344 | ||
6e1dbf8c PA |
345 | /* Get the matching completer_handle_brkchars_ftype function for FN. |
346 | FN is one of the core completer functions above (filename, | |
347 | location, symbol, etc.). This function is useful for cases when | |
348 | the completer doesn't know the type of the completion until some | |
7d793aa9 SDJ |
349 | calculation is done (e.g., for Python functions). */ |
350 | ||
6e1dbf8c PA |
351 | extern completer_handle_brkchars_ftype * |
352 | completer_handle_brkchars_func_for_completer (completer_ftype *fn); | |
7d793aa9 | 353 | |
c5f0f3d0 FN |
354 | /* Exported to linespec.c */ |
355 | ||
d7561cbb KS |
356 | extern const char *skip_quoted_chars (const char *, const char *, |
357 | const char *); | |
4e87b832 | 358 | |
d7561cbb | 359 | extern const char *skip_quoted (const char *); |
c5f0f3d0 | 360 | |
ef0b411a GB |
361 | /* Maximum number of candidates to consider before the completer |
362 | bails by throwing MAX_COMPLETIONS_REACHED_ERROR. Negative values | |
363 | disable limiting. */ | |
364 | ||
365 | extern int max_completions; | |
366 | ||
c5f0f3d0 | 367 | #endif /* defined (COMPLETER_H) */ |