diff options
Diffstat (limited to 'MSVC/readline/isearch.c')
| -rw-r--r-- | MSVC/readline/isearch.c | 558 |
1 files changed, 558 insertions, 0 deletions
diff --git a/MSVC/readline/isearch.c b/MSVC/readline/isearch.c new file mode 100644 index 0000000..a9d28bd --- /dev/null +++ b/MSVC/readline/isearch.c @@ -0,0 +1,558 @@ +/* **************************************************************** */ +/* */ +/* I-Search and Searching */ +/* */ +/* **************************************************************** */ + +/* Copyright (C) 1987-2002 Free Software Foundation, Inc. + + This file contains the Readline Library (the Library), a set of + routines for providing Emacs style line input to programs that ask + for it. + + The Library 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, or (at your option) + any later version. + + The Library 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. + + The GNU General Public License is often shipped with GNU software, and + is generally kept in a file called COPYING or LICENSE. If you do not + have a copy of the license, write to the Free Software Foundation, + 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ +#define READLINE_LIBRARY + +#include "config.h" + +#include <sys/types.h> + +#include <stdio.h> + +#if defined (HAVE_UNISTD_H) +# include <unistd.h> +#endif + +#if defined (HAVE_STDLIB_H) +# include <stdlib.h> +#else +# include "ansi_stdlib.h" +#endif + +#include "rldefs.h" +#include "rlmbutil.h" + +#include "readline.h" +#include "history.h" + +#include "rlprivate.h" +#include "xmalloc.h" + +/* Variables exported to other files in the readline library. */ +char *_rl_isearch_terminators = (char *)NULL; + +/* Variables imported from other files in the readline library. */ +extern HIST_ENTRY *_rl_saved_line_for_history; + +/* Forward declarations */ +static int rl_search_history PARAMS((int, int)); + +/* Last line found by the current incremental search, so we don't `find' + identical lines many times in a row. */ +static char *prev_line_found; + +/* Last search string and its length. */ +static char *last_isearch_string; +static int last_isearch_string_len; + +static char *default_isearch_terminators = "\033\012"; + +/* Search backwards through the history looking for a string which is typed + interactively. Start with the current line. */ +int +rl_reverse_search_history (sign, key) + int sign, key; +{ + return (rl_search_history (-sign, key)); +} + +/* Search forwards through the history looking for a string which is typed + interactively. Start with the current line. */ +int +rl_forward_search_history (sign, key) + int sign, key; +{ + return (rl_search_history (sign, key)); +} + +/* Display the current state of the search in the echo-area. + SEARCH_STRING contains the string that is being searched for, + DIRECTION is zero for forward, or 1 for reverse, + WHERE is the history list number of the current line. If it is + -1, then this line is the starting one. */ +static void +rl_display_search (search_string, reverse_p, where) + char *search_string; + int reverse_p, where; +{ + char *message; + int msglen, searchlen; + + searchlen = (search_string && *search_string) ? strlen (search_string) : 0; + + message = (char *)xmalloc (searchlen + 33); + msglen = 0; + +#if defined (NOTDEF) + if (where != -1) + { + sprintf (message, "[%d]", where + history_base); + msglen = strlen (message); + } +#endif /* NOTDEF */ + + message[msglen++] = '('; + + if (reverse_p) + { + strcpy (message + msglen, "reverse-"); + msglen += 8; + } + + strcpy (message + msglen, "i-search)`"); + msglen += 10; + + if (search_string) + { + strcpy (message + msglen, search_string); + msglen += searchlen; + } + + strcpy (message + msglen, "': "); + + rl_message ("%s", message); + free (message); + (*rl_redisplay_function) (); +} + +/* Search through the history looking for an interactively typed string. + This is analogous to i-search. We start the search in the current line. + DIRECTION is which direction to search; >= 0 means forward, < 0 means + backwards. */ +static int +rl_search_history (direction, invoking_key) + int direction, invoking_key; +{ + /* The string that the user types in to search for. */ + char *search_string; + + /* The current length of SEARCH_STRING. */ + int search_string_index; + + /* The amount of space that SEARCH_STRING has allocated to it. */ + int search_string_size; + + /* The list of lines to search through. */ + char **lines, *allocated_line; + + /* The length of LINES. */ + int hlen; + + /* Where we get LINES from. */ + HIST_ENTRY **hlist; + + register int i; + int orig_point, orig_mark, orig_line, last_found_line; + int c, found, failed, sline_len; + int n, wstart, wlen; +#if defined (HANDLE_MULTIBYTE) + char mb[MB_LEN_MAX]; +#endif + + /* The line currently being searched. */ + char *sline; + + /* Offset in that line. */ + int line_index; + + /* Non-zero if we are doing a reverse search. */ + int reverse; + + /* The list of characters which terminate the search, but are not + subsequently executed. If the variable isearch-terminators has + been set, we use that value, otherwise we use ESC and C-J. */ + char *isearch_terminators; + + RL_SETSTATE(RL_STATE_ISEARCH); + orig_point = rl_point; + orig_mark = rl_mark; + last_found_line = orig_line = where_history (); + reverse = direction < 0; + hlist = history_list (); + allocated_line = (char *)NULL; + + isearch_terminators = _rl_isearch_terminators ? _rl_isearch_terminators + : default_isearch_terminators; + + /* Create an arrary of pointers to the lines that we want to search. */ + rl_maybe_replace_line (); + i = 0; + if (hlist) + for (i = 0; hlist[i]; i++); + + /* Allocate space for this many lines, +1 for the current input line, + and remember those lines. */ + lines = (char **)xmalloc ((1 + (hlen = i)) * sizeof (char *)); + for (i = 0; i < hlen; i++) + lines[i] = hlist[i]->line; + + if (_rl_saved_line_for_history) + lines[i] = _rl_saved_line_for_history->line; + else + { + /* Keep track of this so we can free it. */ + allocated_line = (char *)xmalloc (1 + strlen (rl_line_buffer)); + strcpy (allocated_line, &rl_line_buffer[0]); + lines[i] = allocated_line; + } + + hlen++; + + /* The line where we start the search. */ + i = orig_line; + + rl_save_prompt (); + + /* Initialize search parameters. */ + search_string = (char *)xmalloc (search_string_size = 128); + *search_string = '\0'; + search_string_index = 0; + prev_line_found = (char *)0; /* XXX */ + + /* Normalize DIRECTION into 1 or -1. */ + direction = (direction >= 0) ? 1 : -1; + + rl_display_search (search_string, reverse, -1); + + sline = rl_line_buffer; + sline_len = strlen (sline); + line_index = rl_point; + + found = failed = 0; + for (;;) + { + rl_command_func_t *f = (rl_command_func_t *)NULL; + + /* Read a key and decide how to proceed. */ + RL_SETSTATE(RL_STATE_MOREINPUT); + c = rl_read_key (); + RL_UNSETSTATE(RL_STATE_MOREINPUT); + +#if defined (HANDLE_MULTIBYTE) + if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) + c = _rl_read_mbstring (c, mb, MB_LEN_MAX); +#endif + + /* Translate the keys we do something with to opcodes. */ + if (c >= 0 && _rl_keymap[c].type == ISFUNC) + { + f = _rl_keymap[c].function; + + if (f == rl_reverse_search_history) + c = reverse ? -1 : -2; + else if (f == rl_forward_search_history) + c = !reverse ? -1 : -2; + else if (f == rl_rubout) + c = -3; + else if (c == CTRL ('G')) + c = -4; + else if (c == CTRL ('W')) /* XXX */ + c = -5; + else if (c == CTRL ('Y')) /* XXX */ + c = -6; + } + + /* The characters in isearch_terminators (set from the user-settable + variable isearch-terminators) are used to terminate the search but + not subsequently execute the character as a command. The default + value is "\033\012" (ESC and C-J). */ + if (strchr (isearch_terminators, c)) + { + /* ESC still terminates the search, but if there is pending + input or if input arrives within 0.1 seconds (on systems + with select(2)) it is used as a prefix character + with rl_execute_next. WATCH OUT FOR THIS! This is intended + to allow the arrow keys to be used like ^F and ^B are used + to terminate the search and execute the movement command. + XXX - since _rl_input_available depends on the application- + settable keyboard timeout value, this could alternatively + use _rl_input_queued(100000) */ + if (c == ESC && _rl_input_available ()) + rl_execute_next (ESC); + break; + } + +#define ENDSRCH_CHAR(c) \ + ((CTRL_CHAR (c) || META_CHAR (c) || (c) == RUBOUT) && ((c) != CTRL ('G'))) + +#if defined (HANDLE_MULTIBYTE) + if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) + { + if (c >= 0 && strlen (mb) == 1 && ENDSRCH_CHAR (c)) + { + /* This sets rl_pending_input to c; it will be picked up the next + time rl_read_key is called. */ + rl_execute_next (c); + break; + } + } + else +#endif + if (c >= 0 && ENDSRCH_CHAR (c)) + { + /* This sets rl_pending_input to c; it will be picked up the next + time rl_read_key is called. */ + rl_execute_next (c); + break; + } + + switch (c) + { + case -1: + if (search_string_index == 0) + { + if (last_isearch_string) + { + search_string_size = 64 + last_isearch_string_len; + search_string = (char *)xrealloc (search_string, search_string_size); + strcpy (search_string, last_isearch_string); + search_string_index = last_isearch_string_len; + rl_display_search (search_string, reverse, -1); + break; + } + continue; + } + else if (reverse) + --line_index; + else if (line_index != sline_len) + ++line_index; + else + rl_ding (); + break; + + /* switch directions */ + case -2: + direction = -direction; + reverse = direction < 0; + break; + + /* delete character from search string. */ + case -3: /* C-H, DEL */ + /* This is tricky. To do this right, we need to keep a + stack of search positions for the current search, with + sentinels marking the beginning and end. But this will + do until we have a real isearch-undo. */ + if (search_string_index == 0) + rl_ding (); + else + search_string[--search_string_index] = '\0'; + + break; + + case -4: /* C-G */ + rl_replace_line (lines[orig_line], 0); + rl_point = orig_point; + rl_mark = orig_mark; + rl_restore_prompt(); + rl_clear_message (); + if (allocated_line) + free (allocated_line); + free (lines); + RL_UNSETSTATE(RL_STATE_ISEARCH); + return 0; + + case -5: /* C-W */ + /* skip over portion of line we already matched */ + wstart = rl_point + search_string_index; + if (wstart >= rl_end) + { + rl_ding (); + break; + } + + /* if not in a word, move to one. */ + if (rl_alphabetic(rl_line_buffer[wstart]) == 0) + { + rl_ding (); + break; + } + n = wstart; + while (n < rl_end && rl_alphabetic(rl_line_buffer[n])) + n++; + wlen = n - wstart + 1; + if (search_string_index + wlen + 1 >= search_string_size) + { + search_string_size += wlen + 1; + search_string = (char *)xrealloc (search_string, search_string_size); + } + for (; wstart < n; wstart++) + search_string[search_string_index++] = rl_line_buffer[wstart]; + search_string[search_string_index] = '\0'; + break; + + case -6: /* C-Y */ + /* skip over portion of line we already matched */ + wstart = rl_point + search_string_index; + if (wstart >= rl_end) + { + rl_ding (); + break; + } + n = rl_end - wstart + 1; + if (search_string_index + n + 1 >= search_string_size) + { + search_string_size += n + 1; + search_string = (char *)xrealloc (search_string, search_string_size); + } + for (n = wstart; n < rl_end; n++) + search_string[search_string_index++] = rl_line_buffer[n]; + search_string[search_string_index] = '\0'; + break; + + default: + /* Add character to search string and continue search. */ + if (search_string_index + 2 >= search_string_size) + { + search_string_size += 128; + search_string = (char *)xrealloc (search_string, search_string_size); + } +#if defined (HANDLE_MULTIBYTE) + if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) + { + int j, l; + for (j = 0, l = strlen (mb); j < l; ) + search_string[search_string_index++] = mb[j++]; + } + else +#endif + search_string[search_string_index++] = c; + search_string[search_string_index] = '\0'; + break; + } + + for (found = failed = 0;;) + { + int limit = sline_len - search_string_index + 1; + + /* Search the current line. */ + while (reverse ? (line_index >= 0) : (line_index < limit)) + { + if (STREQN (search_string, sline + line_index, search_string_index)) + { + found++; + break; + } + else + line_index += direction; + } + if (found) + break; + + /* Move to the next line, but skip new copies of the line + we just found and lines shorter than the string we're + searching for. */ + do + { + /* Move to the next line. */ + i += direction; + + /* At limit for direction? */ + if (reverse ? (i < 0) : (i == hlen)) + { + failed++; + break; + } + + /* We will need these later. */ + sline = lines[i]; + sline_len = strlen (sline); + } + while ((prev_line_found && STREQ (prev_line_found, lines[i])) || + (search_string_index > sline_len)); + + if (failed) + break; + + /* Now set up the line for searching... */ + line_index = reverse ? sline_len - search_string_index : 0; + } + + if (failed) + { + /* We cannot find the search string. Ding the bell. */ + rl_ding (); + i = last_found_line; + continue; /* XXX - was break */ + } + + /* We have found the search string. Just display it. But don't + actually move there in the history list until the user accepts + the location. */ + if (found) + { + prev_line_found = lines[i]; + rl_replace_line (lines[i], 0); + rl_point = line_index; + last_found_line = i; + rl_display_search (search_string, reverse, (i == orig_line) ? -1 : i); + } + } + + /* The searching is over. The user may have found the string that she + was looking for, or else she may have exited a failing search. If + LINE_INDEX is -1, then that shows that the string searched for was + not found. We use this to determine where to place rl_point. */ + + /* First put back the original state. */ + strcpy (rl_line_buffer, lines[orig_line]); + + rl_restore_prompt (); + + /* Save the search string for possible later use. */ + FREE (last_isearch_string); + last_isearch_string = search_string; + last_isearch_string_len = search_string_index; + + if (last_found_line < orig_line) + rl_get_previous_history (orig_line - last_found_line, 0); + else + rl_get_next_history (last_found_line - orig_line, 0); + + /* If the string was not found, put point at the end of the last matching + line. If last_found_line == orig_line, we didn't find any matching + history lines at all, so put point back in its original position. */ + if (line_index < 0) + { + if (last_found_line == orig_line) + line_index = orig_point; + else + line_index = strlen (rl_line_buffer); + rl_mark = orig_mark; + } + + rl_point = line_index; + /* Don't worry about where to put the mark here; rl_get_previous_history + and rl_get_next_history take care of it. */ + + rl_clear_message (); + + FREE (allocated_line); + free (lines); + + RL_UNSETSTATE(RL_STATE_ISEARCH); + + return 0; +} |