729 lines
22 KiB
C
729 lines
22 KiB
C
/* Line completion stuff for GDB, the GNU debugger.
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Copyright 2000, 2001 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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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 "cli/cli-decode.h"
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/* FIXME: This is needed because of lookup_cmd_1().
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We should be 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, 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, but
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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++ 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 supplies
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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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/* These are used when completing on locations, which can mix file
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names and symbol names separated by a colon. */
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static char *gdb_completer_loc_break_characters = " \t\n*|\"';:?><,";
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/* Characters that can be used to quote completion strings. Note that we
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can't include '"' because the gdb C parser treats such quoted sequences
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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, 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 symbols
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but don't want to complete on anything else either. */
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char **
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noop_completer (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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char **
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filename_completer (char *text, char *word)
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{
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int subsequent_name;
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char **return_val;
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int return_val_used;
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int return_val_alloced;
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return_val_used = 0;
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/* Small for testing. */
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return_val_alloced = 1;
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return_val = (char **) xmalloc (return_val_alloced * sizeof (char *));
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subsequent_name = 0;
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while (1)
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{
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char *p;
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p = rl_filename_completion_function (text, subsequent_name);
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if (return_val_used >= return_val_alloced)
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{
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return_val_alloced *= 2;
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return_val =
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(char **) xrealloc (return_val,
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return_val_alloced * sizeof (char *));
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}
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if (p == NULL)
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{
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return_val[return_val_used++] = p;
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break;
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}
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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 seen
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by GDB is a backup file whose name ends in a `~', we will loop
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indefinitely. */
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subsequent_name = 1;
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/* Like emacs, don't complete on old versions. Especially useful
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in the "source" command. */
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if (p[strlen (p) - 1] == '~')
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continue;
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{
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char *q;
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if (word == text)
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/* Return exactly p. */
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return_val[return_val_used++] = 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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return_val[return_val_used++] = q;
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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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return_val[return_val_used++] = q;
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xfree (p);
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}
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}
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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 inserting
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without also affecting the next completion. This should be fixed in
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readline. FIXME. */
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/* Insure 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 etc. */
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char **
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location_completer (char *text, char *word)
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{
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int n_syms = 0, n_files = 0;
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char ** fn_list = NULL;
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char ** 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, 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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/* How many completions do we have in both lists? */
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if (fn_list)
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for ( ; fn_list[n_files]; n_files++)
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;
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if (list)
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for ( ; list[n_syms]; n_syms++)
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;
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/* Make list[] large enough to hold both lists, then catenate
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fn_list[] onto the end of list[]. */
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if (n_syms && n_files)
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{
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list = xrealloc (list, (n_syms + n_files + 1) * sizeof (char *));
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memcpy (list + n_syms, fn_list, (n_files + 1) * sizeof (char *));
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xfree (fn_list);
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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 (n_files = 0; fn_list[n_files]; n_files++)
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{
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memmove (fn_list[n_files], fn_list[n_files] + (word - text),
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strlen (fn_list[n_files]) + 1 - (word - text));
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}
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/* Return just the file-name list as the result. */
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list = fn_list;
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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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/* Complete on command names. Used by "help". */
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char **
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command_completer (char *text, char *word)
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{
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return complete_on_cmdlist (cmdlist, text, word);
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}
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/* Here are some useful test cases for completion. FIXME: These should
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be put in the test suite. They should be tested with both 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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/* Generate completions all at once. Returns a NULL-terminated array
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of strings. Both the array and each element are allocated with
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xmalloc. It can also return NULL if there are no 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 text
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of the line. POINT is the offset in that line of the cursor. You
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should pretend that the line ends at POINT. */
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char **
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complete_line (const char *text, char *line_buffer, int point)
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{
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char **list = NULL;
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char *tmp_command, *p;
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/* Pointer within tmp_command which corresponds to text. */
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char *word;
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struct cmd_list_element *c, *result_list;
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/* Choose the default set of word break characters to break completions.
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If we later find out that we are doing completions on command strings
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(as opposed to strings supplied by the individual command completer
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functions, which can be any string) then we will switch to the
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special word break set for command strings, which leaves out the
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'-' character used in some commands. */
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rl_completer_word_break_characters =
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current_language->la_word_break_characters();
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/* Decide whether to complete on a list of gdb commands or on symbols. */
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tmp_command = (char *) alloca (point + 1);
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p = tmp_command;
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strncpy (tmp_command, line_buffer, point);
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tmp_command[point] = '\0';
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/* Since text always contains some number of characters leading up
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to point, we can find the equivalent position in tmp_command
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by subtracting that many characters from the end of tmp_command. */
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word = tmp_command + point - strlen (text);
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if (point == 0)
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{
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/* An empty line we want to consider ambiguous; that is, it
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could be any command. */
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c = (struct cmd_list_element *) -1;
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result_list = 0;
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}
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else
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{
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c = lookup_cmd_1 (&p, cmdlist, &result_list, 1);
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}
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/* Move p up to the next interesting thing. */
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while (*p == ' ' || *p == '\t')
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{
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p++;
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}
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if (!c)
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{
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/* It is an unrecognized command. So there are no
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possible completions. */
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list = NULL;
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}
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else if (c == (struct cmd_list_element *) -1)
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{
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char *q;
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/* lookup_cmd_1 advances p up to the first ambiguous thing, but
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doesn't advance over that thing itself. Do so now. */
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q = p;
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while (*q && (isalnum (*q) || *q == '-' || *q == '_'))
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++q;
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if (q != tmp_command + point)
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{
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/* There is something beyond the ambiguous
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command, so there are no possible completions. For
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example, "info t " or "info t foo" does not complete
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to anything, because "info t" can be "info target" or
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"info terminal". */
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list = NULL;
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}
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else
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{
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/* We're trying to complete on the command which was ambiguous.
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This we can deal with. */
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if (result_list)
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{
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list = complete_on_cmdlist (*result_list->prefixlist, p,
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word);
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}
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else
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{
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list = complete_on_cmdlist (cmdlist, p, word);
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}
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/* Insure that readline does the right thing with respect to
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inserting quotes. */
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rl_completer_word_break_characters =
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gdb_completer_command_word_break_characters;
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}
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}
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else
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{
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/* We've recognized a full command. */
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if (p == tmp_command + point)
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{
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/* There is no non-whitespace in the line beyond the command. */
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if (p[-1] == ' ' || p[-1] == '\t')
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{
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/* The command is followed by whitespace; we need to complete
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on whatever comes after command. */
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if (c->prefixlist)
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{
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/* It is a prefix command; what comes after it is
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a subcommand (e.g. "info "). */
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list = complete_on_cmdlist (*c->prefixlist, p, word);
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/* Insure 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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gdb_completer_command_word_break_characters;
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}
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else if (c->enums)
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{
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list = complete_on_enum (c->enums, p, word);
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rl_completer_word_break_characters =
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gdb_completer_command_word_break_characters;
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}
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else
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{
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/* It is a normal command; what comes after it is
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completed by the command's completer function. */
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if (c->completer == filename_completer)
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{
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/* Many commands which want to complete on
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file names accept several file names, as
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in "run foo bar >>baz". So we don't want
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to complete the entire text after the
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command, just the last word. To this
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end, we need to find the beginning of the
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file name by starting at `word' and going
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||
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--)
|
||
;
|
||
}
|
||
list = (*c->completer) (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;
|
||
}
|
||
|
||
list = complete_on_cmdlist (result_list, q, word);
|
||
|
||
/* Insure that readline does the right thing
|
||
with respect to inserting quotes. */
|
||
rl_completer_word_break_characters =
|
||
gdb_completer_command_word_break_characters;
|
||
}
|
||
}
|
||
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)
|
||
{
|
||
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--)
|
||
;
|
||
}
|
||
list = (*c->completer) (p, word);
|
||
}
|
||
}
|
||
}
|
||
|
||
return list;
|
||
}
|
||
|
||
/* 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 char **list = (char **) 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. */
|
||
xfree (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. The vector of completions is NULL
|
||
terminated, so 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)
|
||
{
|
||
output = list[index];
|
||
if (output)
|
||
{
|
||
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 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);
|
||
}
|