956 lines
28 KiB
C
956 lines
28 KiB
C
/* Line completion stuff for GDB, the GNU debugger.
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Copyright (C) 2000-2001, 2007-2012 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "expression.h"
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#include "filenames.h" /* For DOSish file names. */
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#include "language.h"
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#include "gdb_assert.h"
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#include "exceptions.h"
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#include "gdb_signals.h"
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#include "cli/cli-decode.h"
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/* FIXME: This is needed because of lookup_cmd_1 (). We should be
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calling a hook instead so we eliminate the CLI dependency. */
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#include "gdbcmd.h"
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/* Needed for rl_completer_word_break_characters() and for
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rl_filename_completion_function. */
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#include "readline/readline.h"
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/* readline defines this. */
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#undef savestring
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#include "completer.h"
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/* Prototypes for local functions. */
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static
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char *line_completion_function (const char *text, int matches,
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char *line_buffer,
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int point);
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/* readline uses the word breaks for two things:
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(1) In figuring out where to point the TEXT parameter to the
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rl_completion_entry_function. Since we don't use TEXT for much,
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it doesn't matter a lot what the word breaks are for this purpose,
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but it does affect how much stuff M-? lists.
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(2) If one of the matches contains a word break character, readline
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will quote it. That's why we switch between
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current_language->la_word_break_characters() and
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gdb_completer_command_word_break_characters. I'm not sure when
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we need this behavior (perhaps for funky characters in C++
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symbols?). */
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/* Variables which are necessary for fancy command line editing. */
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/* When completing on command names, we remove '-' from the list of
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word break characters, since we use it in command names. If the
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readline library sees one in any of the current completion strings,
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it thinks that the string needs to be quoted and automatically
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supplies a leading quote. */
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static char *gdb_completer_command_word_break_characters =
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" \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,";
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/* When completing on file names, we remove from the list of word
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break characters any characters that are commonly used in file
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names, such as '-', '+', '~', etc. Otherwise, readline displays
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incorrect completion candidates. */
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#ifdef HAVE_DOS_BASED_FILE_SYSTEM
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/* MS-DOS and MS-Windows use colon as part of the drive spec, and most
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programs support @foo style response files. */
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static char *gdb_completer_file_name_break_characters = " \t\n*|\"';?><@";
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#else
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static char *gdb_completer_file_name_break_characters = " \t\n*|\"';:?><";
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#endif
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/* Characters that can be used to quote completion strings. Note that
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we can't include '"' because the gdb C parser treats such quoted
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sequences as strings. */
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static char *gdb_completer_quote_characters = "'";
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/* Accessor for some completer data that may interest other files. */
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char *
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get_gdb_completer_quote_characters (void)
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{
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return gdb_completer_quote_characters;
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}
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/* Line completion interface function for readline. */
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char *
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readline_line_completion_function (const char *text, int matches)
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{
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return line_completion_function (text, matches,
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rl_line_buffer, rl_point);
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}
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/* This can be used for functions which don't want to complete on
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symbols but don't want to complete on anything else either. */
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VEC (char_ptr) *
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noop_completer (struct cmd_list_element *ignore,
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char *text, char *prefix)
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{
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return NULL;
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}
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/* Complete on filenames. */
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VEC (char_ptr) *
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filename_completer (struct cmd_list_element *ignore,
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char *text, char *word)
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{
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int subsequent_name;
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VEC (char_ptr) *return_val = NULL;
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subsequent_name = 0;
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while (1)
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{
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char *p, *q;
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p = rl_filename_completion_function (text, subsequent_name);
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if (p == NULL)
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break;
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/* We need to set subsequent_name to a non-zero value before the
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continue line below, because otherwise, if the first file
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seen by GDB is a backup file whose name ends in a `~', we
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will loop indefinitely. */
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subsequent_name = 1;
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/* Like emacs, don't complete on old versions. Especially
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useful in the "source" command. */
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if (p[strlen (p) - 1] == '~')
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{
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xfree (p);
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continue;
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}
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if (word == text)
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/* Return exactly p. */
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q = p;
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else if (word > text)
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{
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/* Return some portion of p. */
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q = xmalloc (strlen (p) + 5);
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strcpy (q, p + (word - text));
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xfree (p);
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}
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else
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{
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/* Return some of TEXT plus p. */
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q = xmalloc (strlen (p) + (text - word) + 5);
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strncpy (q, word, text - word);
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q[text - word] = '\0';
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strcat (q, p);
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xfree (p);
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}
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VEC_safe_push (char_ptr, return_val, q);
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}
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#if 0
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/* There is no way to do this just long enough to affect quote
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inserting without also affecting the next completion. This
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should be fixed in readline. FIXME. */
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/* Ensure that readline does the right thing
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with respect to inserting quotes. */
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rl_completer_word_break_characters = "";
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#endif
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return return_val;
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}
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/* Complete on locations, which might be of two possible forms:
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file:line
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or
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symbol+offset
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This is intended to be used in commands that set breakpoints
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etc. */
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VEC (char_ptr) *
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location_completer (struct cmd_list_element *ignore,
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char *text, char *word)
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{
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int n_syms, n_files, ix;
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VEC (char_ptr) *fn_list = NULL;
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VEC (char_ptr) *list = NULL;
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char *p;
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int quote_found = 0;
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int quoted = *text == '\'' || *text == '"';
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int quote_char = '\0';
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char *colon = NULL;
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char *file_to_match = NULL;
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char *symbol_start = text;
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char *orig_text = text;
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size_t text_len;
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/* Do we have an unquoted colon, as in "break foo.c::bar"? */
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for (p = text; *p != '\0'; ++p)
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{
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if (*p == '\\' && p[1] == '\'')
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p++;
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else if (*p == '\'' || *p == '"')
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{
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quote_found = *p;
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quote_char = *p++;
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while (*p != '\0' && *p != quote_found)
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{
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if (*p == '\\' && p[1] == quote_found)
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p++;
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p++;
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}
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if (*p == quote_found)
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quote_found = 0;
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else
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break; /* Hit the end of text. */
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}
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#if HAVE_DOS_BASED_FILE_SYSTEM
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/* If we have a DOS-style absolute file name at the beginning of
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TEXT, and the colon after the drive letter is the only colon
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we found, pretend the colon is not there. */
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else if (p < text + 3 && *p == ':' && p == text + 1 + quoted)
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;
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#endif
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else if (*p == ':' && !colon)
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{
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colon = p;
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symbol_start = p + 1;
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}
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else if (strchr (current_language->la_word_break_characters(), *p))
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symbol_start = p + 1;
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}
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if (quoted)
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text++;
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text_len = strlen (text);
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/* Where is the file name? */
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if (colon)
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{
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char *s;
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file_to_match = (char *) xmalloc (colon - text + 1);
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strncpy (file_to_match, text, colon - text + 1);
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/* Remove trailing colons and quotes from the file name. */
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for (s = file_to_match + (colon - text);
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s > file_to_match;
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s--)
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if (*s == ':' || *s == quote_char)
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*s = '\0';
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}
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/* If the text includes a colon, they want completion only on a
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symbol name after the colon. Otherwise, we need to complete on
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symbols as well as on files. */
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if (colon)
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{
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list = make_file_symbol_completion_list (symbol_start, word,
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file_to_match);
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xfree (file_to_match);
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}
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else
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{
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list = make_symbol_completion_list (symbol_start, word);
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/* If text includes characters which cannot appear in a file
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name, they cannot be asking for completion on files. */
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if (strcspn (text,
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gdb_completer_file_name_break_characters) == text_len)
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fn_list = make_source_files_completion_list (text, text);
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}
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n_syms = VEC_length (char_ptr, list);
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n_files = VEC_length (char_ptr, fn_list);
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/* Catenate fn_list[] onto the end of list[]. */
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if (!n_syms)
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{
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VEC_free (char_ptr, list); /* Paranoia. */
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list = fn_list;
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fn_list = NULL;
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}
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else
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{
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for (ix = 0; VEC_iterate (char_ptr, fn_list, ix, p); ++ix)
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VEC_safe_push (char_ptr, list, p);
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VEC_free (char_ptr, fn_list);
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}
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if (n_syms && n_files)
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{
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/* Nothing. */
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}
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else if (n_files)
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{
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/* If we only have file names as possible completion, we should
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bring them in sync with what rl_complete expects. The
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problem is that if the user types "break /foo/b TAB", and the
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possible completions are "/foo/bar" and "/foo/baz"
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rl_complete expects us to return "bar" and "baz", without the
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leading directories, as possible completions, because `word'
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starts at the "b". But we ignore the value of `word' when we
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call make_source_files_completion_list above (because that
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would not DTRT when the completion results in both symbols
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and file names), so make_source_files_completion_list returns
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the full "/foo/bar" and "/foo/baz" strings. This produces
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wrong results when, e.g., there's only one possible
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completion, because rl_complete will prepend "/foo/" to each
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candidate completion. The loop below removes that leading
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part. */
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for (ix = 0; VEC_iterate (char_ptr, list, ix, p); ++ix)
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{
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memmove (p, p + (word - text),
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strlen (p) + 1 - (word - text));
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}
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}
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else if (!n_syms)
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{
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/* No completions at all. As the final resort, try completing
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on the entire text as a symbol. */
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list = make_symbol_completion_list (orig_text, word);
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}
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return list;
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}
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/* Helper for expression_completer which recursively adds field and
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method names from TYPE, a struct or union type, to the array
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OUTPUT. */
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static void
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add_struct_fields (struct type *type, VEC (char_ptr) **output,
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char *fieldname, int namelen)
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{
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int i;
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int computed_type_name = 0;
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const char *type_name = NULL;
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CHECK_TYPEDEF (type);
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for (i = 0; i < TYPE_NFIELDS (type); ++i)
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{
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if (i < TYPE_N_BASECLASSES (type))
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add_struct_fields (TYPE_BASECLASS (type, i),
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output, fieldname, namelen);
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else if (TYPE_FIELD_NAME (type, i))
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{
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if (TYPE_FIELD_NAME (type, i)[0] != '\0')
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{
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if (! strncmp (TYPE_FIELD_NAME (type, i),
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fieldname, namelen))
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VEC_safe_push (char_ptr, *output,
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xstrdup (TYPE_FIELD_NAME (type, i)));
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}
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else if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_UNION)
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{
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/* Recurse into anonymous unions. */
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add_struct_fields (TYPE_FIELD_TYPE (type, i),
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output, fieldname, namelen);
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}
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}
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}
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for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; --i)
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{
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const char *name = TYPE_FN_FIELDLIST_NAME (type, i);
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if (name && ! strncmp (name, fieldname, namelen))
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{
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if (!computed_type_name)
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{
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type_name = type_name_no_tag (type);
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computed_type_name = 1;
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}
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/* Omit constructors from the completion list. */
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if (!type_name || strcmp (type_name, name))
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VEC_safe_push (char_ptr, *output, xstrdup (name));
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}
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}
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}
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/* Complete on expressions. Often this means completing on symbol
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names, but some language parsers also have support for completing
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field names. */
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VEC (char_ptr) *
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expression_completer (struct cmd_list_element *ignore,
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char *text, char *word)
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{
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struct type *type = NULL;
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char *fieldname, *p;
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volatile struct gdb_exception except;
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enum type_code code = TYPE_CODE_UNDEF;
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/* Perform a tentative parse of the expression, to see whether a
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field completion is required. */
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fieldname = NULL;
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TRY_CATCH (except, RETURN_MASK_ERROR)
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{
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type = parse_expression_for_completion (text, &fieldname, &code);
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}
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if (except.reason < 0)
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return NULL;
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if (fieldname && type)
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{
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for (;;)
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{
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CHECK_TYPEDEF (type);
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if (TYPE_CODE (type) != TYPE_CODE_PTR
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&& TYPE_CODE (type) != TYPE_CODE_REF)
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break;
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type = TYPE_TARGET_TYPE (type);
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}
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if (TYPE_CODE (type) == TYPE_CODE_UNION
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|| TYPE_CODE (type) == TYPE_CODE_STRUCT)
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{
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int flen = strlen (fieldname);
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VEC (char_ptr) *result = NULL;
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add_struct_fields (type, &result, fieldname, flen);
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xfree (fieldname);
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return result;
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}
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}
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else if (fieldname && code != TYPE_CODE_UNDEF)
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{
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VEC (char_ptr) *result;
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struct cleanup *cleanup = make_cleanup (xfree, fieldname);
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result = make_symbol_completion_type (fieldname, fieldname, code);
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do_cleanups (cleanup);
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return result;
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}
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xfree (fieldname);
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/* Commands which complete on locations want to see the entire
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argument. */
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for (p = word;
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p > text && p[-1] != ' ' && p[-1] != '\t';
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p--)
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;
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/* Not ideal but it is what we used to do before... */
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return location_completer (ignore, p, word);
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}
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/* Here are some useful test cases for completion. FIXME: These
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should be put in the test suite. They should be tested with both
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M-? and TAB.
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"show output-" "radix"
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"show output" "-radix"
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"p" ambiguous (commands starting with p--path, print, printf, etc.)
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"p " ambiguous (all symbols)
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"info t foo" no completions
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"info t " no completions
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"info t" ambiguous ("info target", "info terminal", etc.)
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"info ajksdlfk" no completions
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"info ajksdlfk " no completions
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"info" " "
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"info " ambiguous (all info commands)
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"p \"a" no completions (string constant)
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"p 'a" ambiguous (all symbols starting with a)
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"p b-a" ambiguous (all symbols starting with a)
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"p b-" ambiguous (all symbols)
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"file Make" "file" (word break hard to screw up here)
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"file ../gdb.stabs/we" "ird" (needs to not break word at slash)
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*/
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typedef enum
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{
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handle_brkchars,
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handle_completions,
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handle_help
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}
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complete_line_internal_reason;
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/* Internal function used to handle completions.
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TEXT is the caller's idea of the "word" we are looking at.
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LINE_BUFFER is available to be looked at; it contains the entire
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text of the line. POINT is the offset in that line of the cursor.
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You should pretend that the line ends at POINT.
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REASON is of type complete_line_internal_reason.
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If REASON is handle_brkchars:
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Preliminary phase, called by gdb_completion_word_break_characters
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function, is used to determine the correct set of chars that are
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word delimiters depending on the current command in line_buffer.
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No completion list should be generated; the return value should be
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NULL. This is checked by an assertion in that function.
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If REASON is handle_completions:
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Main phase, called by complete_line function, is used to get the list
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of posible completions.
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If REASON is handle_help:
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Special case when completing a 'help' command. In this case,
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once sub-command completions are exhausted, we simply return NULL.
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*/
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static VEC (char_ptr) *
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complete_line_internal (const char *text,
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char *line_buffer, int point,
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complete_line_internal_reason reason)
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{
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VEC (char_ptr) *list = NULL;
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char *tmp_command, *p;
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int ignore_help_classes;
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/* Pointer within tmp_command which corresponds to text. */
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char *word;
|
||
struct cmd_list_element *c, *result_list;
|
||
|
||
/* Choose the default set of word break characters to break
|
||
completions. If we later find out that we are doing completions
|
||
on command strings (as opposed to strings supplied by the
|
||
individual command completer functions, which can be any string)
|
||
then we will switch to the special word break set for command
|
||
strings, which leaves out the '-' character used in some
|
||
commands. */
|
||
rl_completer_word_break_characters =
|
||
current_language->la_word_break_characters();
|
||
|
||
/* Decide whether to complete on a list of gdb commands or on
|
||
symbols. */
|
||
tmp_command = (char *) alloca (point + 1);
|
||
p = tmp_command;
|
||
|
||
/* The help command should complete help aliases. */
|
||
ignore_help_classes = reason != handle_help;
|
||
|
||
strncpy (tmp_command, line_buffer, point);
|
||
tmp_command[point] = '\0';
|
||
/* Since text always contains some number of characters leading up
|
||
to point, we can find the equivalent position in tmp_command
|
||
by subtracting that many characters from the end of tmp_command. */
|
||
word = tmp_command + point - strlen (text);
|
||
|
||
if (point == 0)
|
||
{
|
||
/* An empty line we want to consider ambiguous; that is, it
|
||
could be any command. */
|
||
c = CMD_LIST_AMBIGUOUS;
|
||
result_list = 0;
|
||
}
|
||
else
|
||
{
|
||
c = lookup_cmd_1 (&p, cmdlist, &result_list, ignore_help_classes);
|
||
}
|
||
|
||
/* Move p up to the next interesting thing. */
|
||
while (*p == ' ' || *p == '\t')
|
||
{
|
||
p++;
|
||
}
|
||
|
||
if (!c)
|
||
{
|
||
/* It is an unrecognized command. So there are no
|
||
possible completions. */
|
||
list = NULL;
|
||
}
|
||
else if (c == CMD_LIST_AMBIGUOUS)
|
||
{
|
||
char *q;
|
||
|
||
/* lookup_cmd_1 advances p up to the first ambiguous thing, but
|
||
doesn't advance over that thing itself. Do so now. */
|
||
q = p;
|
||
while (*q && (isalnum (*q) || *q == '-' || *q == '_'))
|
||
++q;
|
||
if (q != tmp_command + point)
|
||
{
|
||
/* There is something beyond the ambiguous
|
||
command, so there are no possible completions. For
|
||
example, "info t " or "info t foo" does not complete
|
||
to anything, because "info t" can be "info target" or
|
||
"info terminal". */
|
||
list = NULL;
|
||
}
|
||
else
|
||
{
|
||
/* We're trying to complete on the command which was ambiguous.
|
||
This we can deal with. */
|
||
if (result_list)
|
||
{
|
||
if (reason != handle_brkchars)
|
||
list = complete_on_cmdlist (*result_list->prefixlist, p,
|
||
word, ignore_help_classes);
|
||
}
|
||
else
|
||
{
|
||
if (reason != handle_brkchars)
|
||
list = complete_on_cmdlist (cmdlist, p, word,
|
||
ignore_help_classes);
|
||
}
|
||
/* Ensure that readline does the right thing with respect to
|
||
inserting quotes. */
|
||
rl_completer_word_break_characters =
|
||
gdb_completer_command_word_break_characters;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* We've recognized a full command. */
|
||
|
||
if (p == tmp_command + point)
|
||
{
|
||
/* There is no non-whitespace in the line beyond the
|
||
command. */
|
||
|
||
if (p[-1] == ' ' || p[-1] == '\t')
|
||
{
|
||
/* The command is followed by whitespace; we need to
|
||
complete on whatever comes after command. */
|
||
if (c->prefixlist)
|
||
{
|
||
/* It is a prefix command; what comes after it is
|
||
a subcommand (e.g. "info "). */
|
||
if (reason != handle_brkchars)
|
||
list = complete_on_cmdlist (*c->prefixlist, p, word,
|
||
ignore_help_classes);
|
||
|
||
/* Ensure that readline does the right thing
|
||
with respect to inserting quotes. */
|
||
rl_completer_word_break_characters =
|
||
gdb_completer_command_word_break_characters;
|
||
}
|
||
else if (reason == handle_help)
|
||
list = NULL;
|
||
else if (c->enums)
|
||
{
|
||
if (reason != handle_brkchars)
|
||
list = complete_on_enum (c->enums, p, word);
|
||
rl_completer_word_break_characters =
|
||
gdb_completer_command_word_break_characters;
|
||
}
|
||
else
|
||
{
|
||
/* It is a normal command; what comes after it is
|
||
completed by the command's completer function. */
|
||
if (c->completer == filename_completer)
|
||
{
|
||
/* Many commands which want to complete on
|
||
file names accept several file names, as
|
||
in "run foo bar >>baz". So we don't want
|
||
to complete the entire text after the
|
||
command, just the last word. To this
|
||
end, we need to find the beginning of the
|
||
file name by starting at `word' and going
|
||
backwards. */
|
||
for (p = word;
|
||
p > tmp_command
|
||
&& strchr (gdb_completer_file_name_break_characters, p[-1]) == NULL;
|
||
p--)
|
||
;
|
||
rl_completer_word_break_characters =
|
||
gdb_completer_file_name_break_characters;
|
||
}
|
||
else if (c->completer == location_completer)
|
||
{
|
||
/* Commands which complete on locations want to
|
||
see the entire argument. */
|
||
for (p = word;
|
||
p > tmp_command
|
||
&& p[-1] != ' ' && p[-1] != '\t';
|
||
p--)
|
||
;
|
||
}
|
||
if (reason != handle_brkchars && c->completer != NULL)
|
||
list = (*c->completer) (c, p, word);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* The command is not followed by whitespace; we need to
|
||
complete on the command itself, e.g. "p" which is a
|
||
command itself but also can complete to "print", "ptype"
|
||
etc. */
|
||
char *q;
|
||
|
||
/* Find the command we are completing on. */
|
||
q = p;
|
||
while (q > tmp_command)
|
||
{
|
||
if (isalnum (q[-1]) || q[-1] == '-' || q[-1] == '_')
|
||
--q;
|
||
else
|
||
break;
|
||
}
|
||
|
||
if (reason != handle_brkchars)
|
||
list = complete_on_cmdlist (result_list, q, word,
|
||
ignore_help_classes);
|
||
|
||
/* Ensure that readline does the right thing
|
||
with respect to inserting quotes. */
|
||
rl_completer_word_break_characters =
|
||
gdb_completer_command_word_break_characters;
|
||
}
|
||
}
|
||
else if (reason == handle_help)
|
||
list = NULL;
|
||
else
|
||
{
|
||
/* There is non-whitespace beyond the command. */
|
||
|
||
if (c->prefixlist && !c->allow_unknown)
|
||
{
|
||
/* It is an unrecognized subcommand of a prefix command,
|
||
e.g. "info adsfkdj". */
|
||
list = NULL;
|
||
}
|
||
else if (c->enums)
|
||
{
|
||
if (reason != handle_brkchars)
|
||
list = complete_on_enum (c->enums, p, word);
|
||
}
|
||
else
|
||
{
|
||
/* It is a normal command. */
|
||
if (c->completer == filename_completer)
|
||
{
|
||
/* See the commentary above about the specifics
|
||
of file-name completion. */
|
||
for (p = word;
|
||
p > tmp_command
|
||
&& strchr (gdb_completer_file_name_break_characters,
|
||
p[-1]) == NULL;
|
||
p--)
|
||
;
|
||
rl_completer_word_break_characters =
|
||
gdb_completer_file_name_break_characters;
|
||
}
|
||
else if (c->completer == location_completer)
|
||
{
|
||
for (p = word;
|
||
p > tmp_command
|
||
&& p[-1] != ' ' && p[-1] != '\t';
|
||
p--)
|
||
;
|
||
}
|
||
if (reason != handle_brkchars && c->completer != NULL)
|
||
list = (*c->completer) (c, p, word);
|
||
}
|
||
}
|
||
}
|
||
|
||
return list;
|
||
}
|
||
/* Generate completions all at once. Returns a vector of strings.
|
||
Each element is allocated with xmalloc. It can also return NULL if
|
||
there are no completions.
|
||
|
||
TEXT is the caller's idea of the "word" we are looking at.
|
||
|
||
LINE_BUFFER is available to be looked at; it contains the entire
|
||
text of the line.
|
||
|
||
POINT is the offset in that line of the cursor. You
|
||
should pretend that the line ends at POINT. */
|
||
|
||
VEC (char_ptr) *
|
||
complete_line (const char *text, char *line_buffer, int point)
|
||
{
|
||
return complete_line_internal (text, line_buffer,
|
||
point, handle_completions);
|
||
}
|
||
|
||
/* Complete on command names. Used by "help". */
|
||
VEC (char_ptr) *
|
||
command_completer (struct cmd_list_element *ignore,
|
||
char *text, char *word)
|
||
{
|
||
return complete_line_internal (word, text,
|
||
strlen (text), handle_help);
|
||
}
|
||
|
||
/* Complete on signals. */
|
||
|
||
VEC (char_ptr) *
|
||
signal_completer (struct cmd_list_element *ignore,
|
||
char *text, char *word)
|
||
{
|
||
int i;
|
||
VEC (char_ptr) *return_val = NULL;
|
||
size_t len = strlen (word);
|
||
enum gdb_signal signum;
|
||
const char *signame;
|
||
|
||
for (signum = GDB_SIGNAL_FIRST; signum != GDB_SIGNAL_LAST; ++signum)
|
||
{
|
||
/* Can't handle this, so skip it. */
|
||
if (signum == GDB_SIGNAL_0)
|
||
continue;
|
||
|
||
signame = gdb_signal_to_name (signum);
|
||
|
||
/* Ignore the unknown signal case. */
|
||
if (!signame || strcmp (signame, "?") == 0)
|
||
continue;
|
||
|
||
if (strncasecmp (signame, word, len) == 0)
|
||
VEC_safe_push (char_ptr, return_val, xstrdup (signame));
|
||
}
|
||
|
||
return return_val;
|
||
}
|
||
|
||
/* Get the list of chars that are considered as word breaks
|
||
for the current command. */
|
||
|
||
char *
|
||
gdb_completion_word_break_characters (void)
|
||
{
|
||
VEC (char_ptr) *list;
|
||
|
||
list = complete_line_internal (rl_line_buffer, rl_line_buffer, rl_point,
|
||
handle_brkchars);
|
||
gdb_assert (list == NULL);
|
||
return rl_completer_word_break_characters;
|
||
}
|
||
|
||
/* Generate completions one by one for the completer. Each time we
|
||
are called return another potential completion to the caller.
|
||
line_completion just completes on commands or passes the buck to
|
||
the command's completer function, the stuff specific to symbol
|
||
completion is in make_symbol_completion_list.
|
||
|
||
TEXT is the caller's idea of the "word" we are looking at.
|
||
|
||
MATCHES is the number of matches that have currently been collected
|
||
from calling this completion function. When zero, then we need to
|
||
initialize, otherwise the initialization has already taken place
|
||
and we can just return the next potential completion string.
|
||
|
||
LINE_BUFFER is available to be looked at; it contains the entire
|
||
text of the line. POINT is the offset in that line of the cursor.
|
||
You should pretend that the line ends at POINT.
|
||
|
||
Returns NULL if there are no more completions, else a pointer to a
|
||
string which is a possible completion, it is the caller's
|
||
responsibility to free the string. */
|
||
|
||
static char *
|
||
line_completion_function (const char *text, int matches,
|
||
char *line_buffer, int point)
|
||
{
|
||
static VEC (char_ptr) *list = NULL; /* Cache of completions. */
|
||
static int index; /* Next cached completion. */
|
||
char *output = NULL;
|
||
|
||
if (matches == 0)
|
||
{
|
||
/* The caller is beginning to accumulate a new set of
|
||
completions, so we need to find all of them now, and cache
|
||
them for returning one at a time on future calls. */
|
||
|
||
if (list)
|
||
{
|
||
/* Free the storage used by LIST, but not by the strings
|
||
inside. This is because rl_complete_internal () frees
|
||
the strings. As complete_line may abort by calling
|
||
`error' clear LIST now. */
|
||
VEC_free (char_ptr, list);
|
||
}
|
||
index = 0;
|
||
list = complete_line (text, line_buffer, point);
|
||
}
|
||
|
||
/* If we found a list of potential completions during initialization
|
||
then dole them out one at a time. After returning the last one,
|
||
return NULL (and continue to do so) each time we are called after
|
||
that, until a new list is available. */
|
||
|
||
if (list)
|
||
{
|
||
if (index < VEC_length (char_ptr, list))
|
||
{
|
||
output = VEC_index (char_ptr, list, index);
|
||
index++;
|
||
}
|
||
}
|
||
|
||
#if 0
|
||
/* Can't do this because readline hasn't yet checked the word breaks
|
||
for figuring out whether to insert a quote. */
|
||
if (output == NULL)
|
||
/* Make sure the word break characters are set back to normal for
|
||
the next time that readline tries to complete something. */
|
||
rl_completer_word_break_characters =
|
||
current_language->la_word_break_characters();
|
||
#endif
|
||
|
||
return (output);
|
||
}
|
||
|
||
/* Skip over the possibly quoted word STR (as defined by the quote
|
||
characters QUOTECHARS and the word break characters BREAKCHARS).
|
||
Returns pointer to the location after the "word". If either
|
||
QUOTECHARS or BREAKCHARS is NULL, use the same values used by the
|
||
completer. */
|
||
|
||
char *
|
||
skip_quoted_chars (char *str, char *quotechars, char *breakchars)
|
||
{
|
||
char quote_char = '\0';
|
||
char *scan;
|
||
|
||
if (quotechars == NULL)
|
||
quotechars = gdb_completer_quote_characters;
|
||
|
||
if (breakchars == NULL)
|
||
breakchars = current_language->la_word_break_characters();
|
||
|
||
for (scan = str; *scan != '\0'; scan++)
|
||
{
|
||
if (quote_char != '\0')
|
||
{
|
||
/* Ignore everything until the matching close quote char. */
|
||
if (*scan == quote_char)
|
||
{
|
||
/* Found matching close quote. */
|
||
scan++;
|
||
break;
|
||
}
|
||
}
|
||
else if (strchr (quotechars, *scan))
|
||
{
|
||
/* Found start of a quoted string. */
|
||
quote_char = *scan;
|
||
}
|
||
else if (strchr (breakchars, *scan))
|
||
{
|
||
break;
|
||
}
|
||
}
|
||
|
||
return (scan);
|
||
}
|
||
|
||
/* Skip over the possibly quoted word STR (as defined by the quote
|
||
characters and word break characters used by the completer).
|
||
Returns pointer to the location after the "word". */
|
||
|
||
char *
|
||
skip_quoted (char *str)
|
||
{
|
||
return skip_quoted_chars (str, NULL, NULL);
|
||
}
|