| /* Line completion stuff for GDB, the GNU debugger. |
| Copyright 2000, 2001 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. */ |
| #ifdef __MSDOS__ |
| /* MS-DOS and MS-Windows use colon as part of the drive spec, and most |
| programs support @foo style response files. */ |
| static char *gdb_completer_file_name_break_characters = " \t\n*|\"';?><@"; |
| #else |
| static char *gdb_completer_file_name_break_characters = " \t\n*|\"';:?><"; |
| #endif |
| |
| /* 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. */ |
| 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 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; |
| } |
| 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; |
| } |
| list = (*c->completer) (p, word); |
| } |
| } |
| } |
| } |
| |
| /* 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); |
| } |
| |