470 lines
14 KiB
C
470 lines
14 KiB
C
/* Line completion stuff for GDB, the GNU debugger.
|
||
Copyright 2000 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "symtab.h"
|
||
#include "gdbtypes.h"
|
||
#include "expression.h"
|
||
|
||
/* FIXME: This is needed because of lookup_cmd_1().
|
||
We should be calling a hook instead so we eliminate the CLI dependency. */
|
||
#include "gdbcmd.h"
|
||
|
||
/* Needed for rl_completer_word_break_characters() */
|
||
#include <readline/readline.h>
|
||
|
||
/* readline defines this. */
|
||
#undef savestring
|
||
|
||
#include "completer.h"
|
||
|
||
/* Prototypes for local functions */
|
||
|
||
/* readline uses the word breaks for two things:
|
||
(1) In figuring out where to point the TEXT parameter to the
|
||
rl_completion_entry_function. Since we don't use TEXT for much,
|
||
it doesn't matter a lot what the word breaks are for this purpose, but
|
||
it does affect how much stuff M-? lists.
|
||
(2) If one of the matches contains a word break character, readline
|
||
will quote it. That's why we switch between
|
||
gdb_completer_word_break_characters and
|
||
gdb_completer_command_word_break_characters. I'm not sure when
|
||
we need this behavior (perhaps for funky characters in C++ symbols?). */
|
||
|
||
/* Variables which are necessary for fancy command line editing. */
|
||
static char *gdb_completer_word_break_characters =
|
||
" \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,-";
|
||
|
||
/* When completing on command names, we remove '-' from the list of
|
||
word break characters, since we use it in command names. If the
|
||
readline library sees one in any of the current completion strings,
|
||
it thinks that the string needs to be quoted and automatically supplies
|
||
a leading quote. */
|
||
static char *gdb_completer_command_word_break_characters =
|
||
" \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,";
|
||
|
||
/* When completing on file names, we remove from the list of word
|
||
break characters any characters that are commonly used in file
|
||
names, such as '-', '+', '~', etc. Otherwise, readline displays
|
||
incorrect completion candidates. */
|
||
static char *gdb_completer_file_name_break_characters = " \t\n*|\"';:?/><";
|
||
|
||
/* Characters that can be used to quote completion strings. Note that we
|
||
can't include '"' because the gdb C parser treats such quoted sequences
|
||
as strings. */
|
||
static char *gdb_completer_quote_characters = "'";
|
||
|
||
/* Accessor for some completer data that may interest other files. */
|
||
|
||
char *
|
||
get_gdb_completer_word_break_characters (void)
|
||
{
|
||
return gdb_completer_word_break_characters;
|
||
}
|
||
|
||
char *
|
||
get_gdb_completer_quote_characters (void)
|
||
{
|
||
return gdb_completer_quote_characters;
|
||
}
|
||
|
||
/* Complete on filenames. */
|
||
char **
|
||
filename_completer (char *text, char *word)
|
||
{
|
||
/* From readline. */
|
||
extern char *filename_completion_function (char *, int);
|
||
int subsequent_name;
|
||
char **return_val;
|
||
int return_val_used;
|
||
int return_val_alloced;
|
||
|
||
return_val_used = 0;
|
||
/* Small for testing. */
|
||
return_val_alloced = 1;
|
||
return_val = (char **) xmalloc (return_val_alloced * sizeof (char *));
|
||
|
||
subsequent_name = 0;
|
||
while (1)
|
||
{
|
||
char *p;
|
||
p = filename_completion_function (text, subsequent_name);
|
||
if (return_val_used >= return_val_alloced)
|
||
{
|
||
return_val_alloced *= 2;
|
||
return_val =
|
||
(char **) xrealloc (return_val,
|
||
return_val_alloced * sizeof (char *));
|
||
}
|
||
if (p == NULL)
|
||
{
|
||
return_val[return_val_used++] = p;
|
||
break;
|
||
}
|
||
/* We need to set subsequent_name to a non-zero value before the
|
||
continue line below, because otherwise, if the first file seen
|
||
by GDB is a backup file whose name ends in a `~', we will loop
|
||
indefinitely. */
|
||
subsequent_name = 1;
|
||
/* Like emacs, don't complete on old versions. Especially useful
|
||
in the "source" command. */
|
||
if (p[strlen (p) - 1] == '~')
|
||
continue;
|
||
|
||
{
|
||
char *q;
|
||
if (word == text)
|
||
/* Return exactly p. */
|
||
return_val[return_val_used++] = p;
|
||
else if (word > text)
|
||
{
|
||
/* Return some portion of p. */
|
||
q = xmalloc (strlen (p) + 5);
|
||
strcpy (q, p + (word - text));
|
||
return_val[return_val_used++] = q;
|
||
xfree (p);
|
||
}
|
||
else
|
||
{
|
||
/* Return some of TEXT plus p. */
|
||
q = xmalloc (strlen (p) + (text - word) + 5);
|
||
strncpy (q, word, text - word);
|
||
q[text - word] = '\0';
|
||
strcat (q, p);
|
||
return_val[return_val_used++] = q;
|
||
xfree (p);
|
||
}
|
||
}
|
||
}
|
||
#if 0
|
||
/* There is no way to do this just long enough to affect quote inserting
|
||
without also affecting the next completion. This should be fixed in
|
||
readline. FIXME. */
|
||
/* Insure that readline does the right thing
|
||
with respect to inserting quotes. */
|
||
rl_completer_word_break_characters = "";
|
||
#endif
|
||
return return_val;
|
||
}
|
||
|
||
/* Here are some useful test cases for completion. FIXME: These should
|
||
be put in the test suite. They should be tested with both M-? and TAB.
|
||
|
||
"show output-" "radix"
|
||
"show output" "-radix"
|
||
"p" ambiguous (commands starting with p--path, print, printf, etc.)
|
||
"p " ambiguous (all symbols)
|
||
"info t foo" no completions
|
||
"info t " no completions
|
||
"info t" ambiguous ("info target", "info terminal", etc.)
|
||
"info ajksdlfk" no completions
|
||
"info ajksdlfk " no completions
|
||
"info" " "
|
||
"info " ambiguous (all info commands)
|
||
"p \"a" no completions (string constant)
|
||
"p 'a" ambiguous (all symbols starting with a)
|
||
"p b-a" ambiguous (all symbols starting with a)
|
||
"p b-" ambiguous (all symbols)
|
||
"file Make" "file" (word break hard to screw up here)
|
||
"file ../gdb.stabs/we" "ird" (needs to not break word at slash)
|
||
*/
|
||
|
||
/* 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. */
|
||
|
||
char *
|
||
line_completion_function (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;
|
||
char *tmp_command, *p;
|
||
/* Pointer within tmp_command which corresponds to text. */
|
||
char *word;
|
||
struct cmd_list_element *c, *result_list;
|
||
|
||
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);
|
||
}
|
||
list = 0;
|
||
index = 0;
|
||
|
||
/* 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 =
|
||
gdb_completer_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;
|
||
|
||
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 = (struct cmd_list_element *) -1;
|
||
result_list = 0;
|
||
}
|
||
else
|
||
{
|
||
c = lookup_cmd_1 (&p, cmdlist, &result_list, 1);
|
||
}
|
||
|
||
/* 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 == (struct cmd_list_element *) -1)
|
||
{
|
||
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)
|
||
{
|
||
list = complete_on_cmdlist (*result_list->prefixlist, p,
|
||
word);
|
||
}
|
||
else
|
||
{
|
||
list = complete_on_cmdlist (cmdlist, p, 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
|
||
{
|
||
/* 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 "). */
|
||
list = complete_on_cmdlist (*c->prefixlist, p, 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 if (c->enums)
|
||
{
|
||
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. */
|
||
list = (*c->completer) (p, word);
|
||
if (c->completer == filename_completer)
|
||
rl_completer_word_break_characters =
|
||
gdb_completer_file_name_break_characters;
|
||
}
|
||
}
|
||
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. */
|
||
list = (*c->completer) (p, word);
|
||
if (c->completer == filename_completer)
|
||
rl_completer_word_break_characters =
|
||
gdb_completer_file_name_break_characters;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* 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 =
|
||
gdb_completer_word_break_characters;
|
||
#endif
|
||
|
||
return (output);
|
||
}
|
||
/* Skip over a possibly quoted word (as defined by the quote characters
|
||
and word break characters the completer uses). Returns pointer to the
|
||
location after the "word". */
|
||
|
||
char *
|
||
skip_quoted (char *str)
|
||
{
|
||
char quote_char = '\0';
|
||
char *scan;
|
||
|
||
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 (gdb_completer_quote_characters, *scan))
|
||
{
|
||
/* Found start of a quoted string. */
|
||
quote_char = *scan;
|
||
}
|
||
else if (strchr (gdb_completer_word_break_characters, *scan))
|
||
{
|
||
break;
|
||
}
|
||
}
|
||
return (scan);
|
||
}
|
||
|