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nano/search.c
Chris Allegretta f6b13420d7 Regexp/search fixes by Bill Soudan 
git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@82 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
2000-07-07 04:25:00 +00:00

556 lines
14 KiB
C
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/**************************************************************************
* search.c *
* *
* Copyright (C) 2000 Chris Allegretta *
* 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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA. *
* *
**************************************************************************/
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include "config.h"
#include "proto.h"
#include "nano.h"
#ifndef NANO_SMALL
#include <libintl.h>
#define _(string) gettext(string)
#else
#define _(string) (string)
#endif
/* Regular expression helper functions */
#ifdef _POSIX_VERSION
void regexp_init(const char *regexp)
{
regcomp(&search_regexp, regexp, ISSET(CASE_SENSITIVE) ? 0 : REG_ICASE);
SET(REGEXP_COMPILED);
}
void regexp_cleanup()
{
UNSET(REGEXP_COMPILED);
regfree(&search_regexp);
}
#endif
/* Set up the system variables for a search or replace. Returns -1 on
abort, 0 on success, and 1 on rerun calling program
Return -2 to run opposite program (searchg -> replace, replace -> search)
replacing = 1 if we call from do_replace, 0 if called from do_search func.
*/
int search_init(int replacing)
{
int i;
char buf[BUFSIZ];
char *prompt;
if (last_search[0]) {
snprintf(buf, BUFSIZ, " [%s]", last_search);
} else {
buf[0] = '\0';
}
if (ISSET(USE_REGEXP) && ISSET(CASE_SENSITIVE))
prompt = _("Case Sensitive Regexp Search%s");
else if (ISSET(USE_REGEXP))
prompt = _("Regexp Search%s");
else
if (ISSET(CASE_SENSITIVE))
prompt = _("Case Sensitive Search%s");
else
prompt = _("Search%s");
i = statusq(replacing ? replace_list : whereis_list,
replacing ? REPLACE_LIST_LEN : WHEREIS_LIST_LEN, "",
prompt, buf);
/* Cancel any search, or just return with no previous search */
if ((i == -1) || (i < 0 && !last_search[0])) {
statusbar(_("Search Cancelled"));
reset_cursor();
return -1;
} else if (i == -2) { /* Same string */
strncpy(answer, last_search, 132);
#ifdef _POSIX_VERSION
if (ISSET(USE_REGEXP))
regexp_init(answer);
#endif
} else if (i == 0) { /* They entered something new */
strncpy(last_search, answer, 132);
#ifdef _POSIX_VERSION
if (ISSET(USE_REGEXP))
regexp_init(answer);
#endif
/* Blow away last_replace because they entered a new search
string....uh, right? =) */
last_replace[0] = '\0';
} else if (i == NANO_CASE_KEY) { /* They want it case sensitive */
if (ISSET(CASE_SENSITIVE))
UNSET(CASE_SENSITIVE);
else
SET(CASE_SENSITIVE);
return 1;
} else if (i == NANO_OTHERSEARCH_KEY) {
return -2; /* Call the opposite search function */
} else if (i == NANO_FROMSEARCHTOGOTO_KEY) {
do_gotoline_void();
return -3;
} else { /* First line key, etc. */
do_early_abort();
return -3;
}
return 0;
}
filestruct *findnextstr(int quiet, filestruct * begin, char *needle)
{
filestruct *fileptr;
char *searchstr, *found = NULL, *tmp;
fileptr = current;
searchstr = &current->data[current_x + 1];
/* Look for searchstr until EOF */
while (fileptr != NULL &&
(found = strstrwrapper(searchstr, needle)) == NULL) {
fileptr = fileptr->next;
if (fileptr == begin)
return NULL;
if (fileptr != NULL)
searchstr = fileptr->data;
}
/* If we're not at EOF, we found an instance */
if (fileptr != NULL) {
current = fileptr;
current_x = 0;
for (tmp = fileptr->data; tmp != found; tmp++)
current_x++;
edit_update(current);
reset_cursor();
} else { /* We're at EOF, go back to the top, once */
fileptr = fileage;
while (fileptr != current && fileptr != begin &&
(found = strstrwrapper(fileptr->data, needle)) == NULL)
fileptr = fileptr->next;
if (fileptr == begin) {
if (!quiet)
statusbar(_("\"%s\" not found"), needle);
return NULL;
}
if (fileptr != current) { /* We found something */
current = fileptr;
current_x = 0;
for (tmp = fileptr->data; tmp != found; tmp++)
current_x++;
edit_update(current);
reset_cursor();
if (!quiet)
statusbar(_("Search Wrapped"));
} else { /* Nada */
if (!quiet)
statusbar(_("\"%s\" not found"), needle);
return NULL;
}
}
return fileptr;
}
void search_abort(void)
{
UNSET(KEEP_CUTBUFFER);
display_main_list();
wrefresh(bottomwin);
#ifdef _POSIX_VERSION
if (ISSET(REGEXP_COMPILED))
regexp_cleanup();
#endif
}
/* Search for a string */
int do_search(void)
{
int i;
filestruct *fileptr = current;
wrap_reset();
if ((i = search_init(0)) == -1) {
current = fileptr;
search_abort();
return 0;
} else if (i == -3) {
search_abort();
return 0;
} else if (i == -2) {
search_abort();
do_replace();
return 0;
} else if (i == 1) {
do_search();
search_abort();
return 1;
}
findnextstr(0, current, answer);
search_abort();
return 1;
}
void print_replaced(int num)
{
if (num > 1)
statusbar(_("Replaced %d occurences"), num);
else if (num == 1)
statusbar(_("Replaced 1 occurence"));
}
void replace_abort(void)
{
UNSET(KEEP_CUTBUFFER);
display_main_list();
reset_cursor();
#ifdef _POSIX_VERSION
if (ISSET(REGEXP_COMPILED))
regexp_cleanup();
#endif
}
#ifdef _POSIX_VERSION
int replace_regexp(char *string, int create_flag)
{
/* split personality here - if create_flag is null, just calculate
* the size of the replacement line (necessary because of
* subexpressions like \1 \2 \3 in the replaced text) */
char *c;
int new_size = strlen(current->data) + 1;
int search_match_count = regmatches[0].rm_eo -
regmatches[0].rm_so;
new_size -= search_match_count;
/* Iterate through the replacement text to handle
* subexpression replacement using \1, \2, \3, etc */
c = last_replace;
while (*c) {
if (*c != '\\') {
if (create_flag)
*string++=*c;
c++;
new_size++;
} else {
int num = (int)*(c+1) - (int)'0';
if (num >= 1 && num <= 9) {
int i = regmatches[num].rm_so;
if (num > search_regexp.re_nsub) {
/* Ugh, they specified a subexpression that doesn't
exist. */
return -1;
}
/* Skip over the replacement expression */
c+=2;
/* But add the length of the subexpression to new_size */
new_size += regmatches[num].rm_eo - regmatches[num].rm_so;
/* And if create_flag is set, append the result of the
* subexpression match to the new line */
while (create_flag && i < regmatches[num].rm_eo )
*string++=*(current->data + i++);
} else {
if (create_flag)
*string++=*c;
c++;
new_size++;
}
}
}
if (create_flag)
*string = 0;
return new_size;
}
#endif
char *replace_line()
{
char *copy, *tmp;
int new_line_size;
int search_match_count;
/* Calculate size of new line */
#ifdef _POSIX_VERSION
if (ISSET(USE_REGEXP)) {
search_match_count = regmatches[0].rm_eo -
regmatches[0].rm_so;
new_line_size = replace_regexp(NULL, 0);
/* If they specified an invalid subexpression in the replace
* text, return NULL indicating an error */
if (new_line_size < 0)
return NULL;
} else {
#else
{
#endif
search_match_count = strlen(last_search);
new_line_size = strlen(current->data) - strlen(last_search) +
strlen(last_replace) + 1;
}
/* Create buffer */
copy = nmalloc(new_line_size);
/* Head of Original Line */
strncpy(copy, current->data, current_x);
copy[current_x] = 0;
/* Replacement Text */
if (!ISSET(USE_REGEXP))
strcat(copy, last_replace);
#ifdef _POSIX_VERSION
else
(void)replace_regexp(copy + current_x, 1);
#endif
/* The tail of the original line */
/* This may expose other bugs, because it no longer
goes through each character on the string
and tests for string goodness. But because
we can assume the invariant that current->data
is less than current_x + strlen(last_search) long,
this should be safe. Or it will expose bugs ;-) */
tmp = current->data + current_x + search_match_count;
strcat(copy, tmp);
return copy;
}
/* Replace a string */
int do_replace(void)
{
int i, replaceall = 0, numreplaced = 0, beginx;
filestruct *fileptr, *begin;
char *copy, prevanswer[132] = "";
if ((i = search_init(1)) == -1) {
statusbar(_("Replace Cancelled"));
replace_abort();
return 0;
} else if (i == 1) {
do_replace();
return 1;
} else if (i == -2) {
replace_abort();
do_search();
return 0;
} else if (i == -3) {
replace_abort();
return 0;
}
strncpy(prevanswer, answer, 132);
if (strcmp(last_replace, "")) { /* There's a previous replace str */
i = statusq(replace_list, REPLACE_LIST_LEN, "",
_("Replace with [%s]"), last_replace);
if (i == -1) { /* Aborted enter */
strncpy(answer, last_replace, 132);
statusbar(_("Replace Cancelled"));
replace_abort();
return 0;
} else if (i == 0) /* They actually entered something */
strncpy(last_replace, answer, 132);
else if (i == NANO_CASE_KEY) { /* They asked for case sensitivity */
if (ISSET(CASE_SENSITIVE))
UNSET(CASE_SENSITIVE);
else
SET(CASE_SENSITIVE);
do_replace();
return 0;
} else if (i != -2 ) { /* First page, last page, for example could get here */
do_early_abort();
replace_abort();
return 0;
}
} else { /* last_search is empty */
i = statusq(replace_list, REPLACE_LIST_LEN, "", _("Replace with"));
if (i == -1) {
statusbar(_("Replace Cancelled"));
reset_cursor();
replace_abort();
return 0;
} else if (i == 0) /* They entered something new */
strncpy(last_replace, answer, 132);
else if (i == NANO_CASE_KEY) { /* They want it case sensitive */
if (ISSET(CASE_SENSITIVE))
UNSET(CASE_SENSITIVE);
else
SET(CASE_SENSITIVE);
do_replace();
return 1;
} else { /* First line key, etc. */
do_early_abort();
replace_abort();
return 0;
}
}
/* save where we are */
begin = current;
beginx = current_x;
while (1) {
if (replaceall)
fileptr = findnextstr(1, begin, prevanswer);
else
fileptr = findnextstr(0, begin, prevanswer);
/* No more matches. Done! */
if (!fileptr)
break;
/* If we're here, we've found the search string */
if (!replaceall)
i = do_yesno(1, 1, _("Replace this instance?"));
if (i > 0 || replaceall) { /* Yes, replace it!!!! */
if (i == 2)
replaceall = 1;
copy = replace_line();
if (!copy) {
statusbar("Replace failed: unknown subexpression!");
replace_abort();
}
/* Cleanup */
free(current->data);
current->data = copy;
/* Stop bug where we replace a substring of the replacement text */
current_x += strlen(last_replace);
edit_refresh();
set_modified();
numreplaced++;
} else if (i == -1) /* Abort, else do nothing and continue loop */
break;
}
current = begin;
current_x = beginx;
renumber_all();
edit_update(current);
print_replaced(numreplaced);
replace_abort();
return 1;
}
void goto_abort(void)
{
UNSET(KEEP_CUTBUFFER);
display_main_list();
}
int do_gotoline(long defline)
{
long line, i = 1, j = 0;
filestruct *fileptr;
if (defline > 0) /* We already know what line we want to go to */
line = defline;
else { /* Ask for it */
j = statusq(goto_list, GOTO_LIST_LEN, "", _("Enter line number"));
if (j == -1) {
statusbar(_("Aborted"));
goto_abort();
return 0;
} else if (j != 0) {
do_early_abort();
goto_abort();
return 0;
}
if (!strcmp(answer, "$")) {
current = filebot;
current_x = 0;
edit_update(current);
goto_abort();
return 1;
}
line = atoi(answer);
}
/* Bounds check */
if (line <= 0) {
statusbar(_("Come on, be reasonable"));
goto_abort();
return 0;
}
if (line > totlines) {
statusbar(_("Only %d lines available, skipping to last line"),
filebot->lineno);
current = filebot;
current_x = 0;
edit_update(current);
} else {
for (fileptr = fileage; fileptr != NULL && i < line; i++)
fileptr = fileptr->next;
current = fileptr;
current_x = 0;
edit_update(current);
}
goto_abort();
return 1;
}
int do_gotoline_void(void)
{
return do_gotoline(0);
}
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