gdb/completer.h

   1 /* Header for GDB line completion.
   2    Copyright (C) 2000-2015 Free Software Foundation, Inc.
   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
   6    the Free Software Foundation; either version 3 of the License, or
   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
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #if !defined (COMPLETER_H)
  18 #define COMPLETER_H 1
  19
  20 #include "gdb_vecs.h"
  21 #include "command.h"
  22
  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
  66 extern void gdb_display_match_list (char **matches, int len, int max,
  67                                     const struct match_list_displayer *);
  68
  69 extern const char *get_max_completions_reached_message (void);
  70
  71 extern VEC (char_ptr) *complete_line (const char *text,
  72                                       const char *line_buffer,
  73                                       int point);
  74
  75 extern char *readline_line_completion_function (const char *text,
  76                                                 int matches);
  77
  78 extern VEC (char_ptr) *noop_completer (struct cmd_list_element *,
  79                                        const char *, const char *);
  80
  81 extern VEC (char_ptr) *filename_completer (struct cmd_list_element *,
  82                                            const char *, const char *);
  83
  84 extern VEC (char_ptr) *expression_completer (struct cmd_list_element *,
  85                                              const char *, const char *);
  86
  87 extern VEC (char_ptr) *location_completer (struct cmd_list_element *,
  88                                            const char *, const char *);
  89
  90 extern VEC (char_ptr) *command_completer (struct cmd_list_element *,
  91                                           const char *, const char *);
  92
  93 extern VEC (char_ptr) *signal_completer (struct cmd_list_element *,
  94                                          const char *, const char *);
  95
  96 extern VEC (char_ptr) *reg_or_group_completer (struct cmd_list_element *,
  97                                                const char *, const char *);
  98
  99 extern VEC (char_ptr) *reggroup_completer (struct cmd_list_element *,
 100                                            const char *, const char *);
 101
 102 extern char *get_gdb_completer_quote_characters (void);
 103
 104 extern char *gdb_completion_word_break_characters (void);
 105
 106 /* Set the word break characters array to the corresponding set of
 107    chars, based on FN.  This function is useful for cases when the
 108    completer doesn't know the type of the completion until some
 109    calculation is done (e.g., for Python functions).  */
 110
 111 extern void set_gdb_completion_word_break_characters (completer_ftype *fn);
 112
 113 /* Exported to linespec.c */
 114
 115 extern const char *skip_quoted_chars (const char *, const char *,
 116                                       const char *);
 117
 118 extern const char *skip_quoted (const char *);
 119
 120 /* Maximum number of candidates to consider before the completer
 121    bails by throwing MAX_COMPLETIONS_REACHED_ERROR.  Negative values
 122    disable limiting.  */
 123
 124 extern int max_completions;
 125
 126 /* Object to track how many unique completions have been generated.
 127    Used to limit the size of generated completion lists.  */
 128
 129 typedef htab_t completion_tracker_t;
 130
 131 /* Create a new completion tracker.
 132    The result is a hash table to track added completions, or NULL
 133    if max_completions <= 0.  If max_completions < 0, tracking is disabled.
 134    If max_completions == 0, the max is indeed zero.  */
 135
 136 extern completion_tracker_t new_completion_tracker (void);
 137
 138 /* Make a cleanup to free a completion tracker, and reset its pointer
 139    to NULL.  */
 140
 141 extern struct cleanup *make_cleanup_free_completion_tracker
 142                       (completion_tracker_t *tracker_ptr);
 143
 144 /* Return values for maybe_add_completion.  */
 145
 146 enum maybe_add_completion_enum
 147 {
 148   /* NAME has been recorded and max_completions has not been reached,
 149      or completion tracking is disabled (max_completions < 0).  */
 150   MAYBE_ADD_COMPLETION_OK,
 151
 152   /* NAME has been recorded and max_completions has been reached
 153      (thus the caller can stop searching).  */
 154   MAYBE_ADD_COMPLETION_OK_MAX_REACHED,
 155
 156   /* max-completions entries has been reached.
 157      Whether NAME is a duplicate or not is not determined.  */
 158   MAYBE_ADD_COMPLETION_MAX_REACHED,
 159
 160   /* NAME has already been recorded.
 161      Note that this is never returned if completion tracking is disabled
 162      (max_completions < 0).  */
 163   MAYBE_ADD_COMPLETION_DUPLICATE
 164 };
 165
 166 /* Add the completion NAME to the list of generated completions if
 167    it is not there already.
 168    If max_completions is negative, nothing is done, not even watching
 169    for duplicates, and MAYBE_ADD_COMPLETION_OK is always returned.
 170
 171    If MAYBE_ADD_COMPLETION_MAX_REACHED is returned, callers are required to
 172    record at least one more completion.  The final list will be pruned to
 173    max_completions, but recording at least one more than max_completions is
 174    the signal to the completion machinery that too many completions were
 175    found.  */
 176
 177 extern enum maybe_add_completion_enum
 178   maybe_add_completion (completion_tracker_t tracker, char *name);
 179
 180 /* Wrapper to throw MAX_COMPLETIONS_REACHED_ERROR.  */
 181
 182 extern void throw_max_completions_reached_error (void);
 183
 184 #endif /* defined (COMPLETER_H) */