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search.c
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search.c
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/*
* Copyright (C) 1984-2011 Mark Nudelman
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information about less, or for information on how to
* contact the author, see the README file.
*/
/*
* Routines to search a file for a pattern.
*/
#include "less.h"
#include "pattern.h"
#include "position.h"
#include "charset.h"
#define MINPOS(a,b) (((a) < (b)) ? (a) : (b))
#define MAXPOS(a,b) (((a) > (b)) ? (a) : (b))
extern int sigs;
extern int how_search;
extern int caseless;
extern int linenums;
extern int sc_height;
extern int jump_sline;
extern int bs_mode;
extern int ctldisp;
extern int status_col;
extern void * constant ml_search;
extern POSITION start_attnpos;
extern POSITION end_attnpos;
extern int utf_mode;
extern int screen_trashed;
#if HILITE_SEARCH
extern int hilite_search;
extern int size_linebuf;
extern int squished;
extern int can_goto_line;
static int hide_hilite;
static POSITION prep_startpos;
static POSITION prep_endpos;
static int is_caseless;
static int is_ucase_pattern;
struct hilite
{
struct hilite *hl_next;
POSITION hl_startpos;
POSITION hl_endpos;
};
static struct hilite hilite_anchor = { NULL, NULL_POSITION, NULL_POSITION };
static struct hilite filter_anchor = { NULL, NULL_POSITION, NULL_POSITION };
#define hl_first hl_next
#endif
/*
* These are the static variables that represent the "remembered"
* search pattern and filter pattern.
*/
struct pattern_info {
DEFINE_PATTERN(compiled);
char* text;
int search_type;
};
static struct pattern_info search_info;
static struct pattern_info filter_info;
/*
* Are there any uppercase letters in this string?
*/
static int
is_ucase(str)
char *str;
{
char *str_end = str + strlen(str);
LWCHAR ch;
while (str < str_end)
{
ch = step_char(&str, +1, str_end);
if (IS_UPPER(ch))
return (1);
}
return (0);
}
/*
* Compile and save a search pattern.
*/
static int
set_pattern(info, pattern, search_type)
struct pattern_info *info;
char *pattern;
int search_type;
{
if (pattern == NULL)
CLEAR_PATTERN(search_info.compiled);
else if (compile_pattern(pattern, search_type, &info->compiled) < 0)
return -1;
/* Pattern compiled successfully; save the text too. */
if (info->text != NULL)
free(info->text);
info->text = NULL;
if (pattern != NULL)
{
info->text = (char *) ecalloc(1, strlen(pattern)+1);
strcpy(info->text, pattern);
}
info->search_type = search_type;
/*
* Ignore case if -I is set OR
* -i is set AND the pattern is all lowercase.
*/
is_ucase_pattern = is_ucase(pattern);
if (is_ucase_pattern && caseless != OPT_ONPLUS)
is_caseless = 0;
else
is_caseless = caseless;
return 0;
}
/*
* Discard a saved pattern.
*/
static void
clear_pattern(info)
struct pattern_info *info;
{
if (info->text != NULL)
free(info->text);
info->text = NULL;
uncompile_pattern(&info->compiled);
}
/*
* Initialize saved pattern to nothing.
*/
static void
init_pattern(info)
struct pattern_info *info;
{
CLEAR_PATTERN(info->compiled);
info->text = NULL;
info->search_type = 0;
}
/*
* Initialize search variables.
*/
public void
init_search()
{
init_pattern(&search_info);
init_pattern(&filter_info);
}
/*
* Determine which text conversions to perform before pattern matching.
*/
static int
get_cvt_ops()
{
int ops = 0;
if (is_caseless || bs_mode == BS_SPECIAL)
{
if (is_caseless)
ops |= CVT_TO_LC;
if (bs_mode == BS_SPECIAL)
ops |= CVT_BS;
if (bs_mode != BS_CONTROL)
ops |= CVT_CRLF;
} else if (bs_mode != BS_CONTROL)
{
ops |= CVT_CRLF;
}
if (ctldisp == OPT_ONPLUS)
ops |= CVT_ANSI;
return (ops);
}
/*
* Is there a previous (remembered) search pattern?
*/
static int
prev_pattern(info)
struct pattern_info *info;
{
if (info->search_type & SRCH_NO_REGEX)
return (info->text != NULL);
return (!is_null_pattern(info->compiled));
}
#if HILITE_SEARCH
/*
* Repaint the hilites currently displayed on the screen.
* Repaint each line which contains highlighted text.
* If on==0, force all hilites off.
*/
public void
repaint_hilite(on)
int on;
{
int slinenum;
POSITION pos;
POSITION epos;
int save_hide_hilite;
if (squished)
repaint();
save_hide_hilite = hide_hilite;
if (!on)
{
if (hide_hilite)
return;
hide_hilite = 1;
}
if (!can_goto_line)
{
repaint();
hide_hilite = save_hide_hilite;
return;
}
for (slinenum = TOP; slinenum < TOP + sc_height-1; slinenum++)
{
pos = position(slinenum);
if (pos == NULL_POSITION)
continue;
epos = position(slinenum+1);
(void) forw_line(pos);
goto_line(slinenum);
put_line();
}
lower_left();
hide_hilite = save_hide_hilite;
}
/*
* Clear the attn hilite.
*/
public void
clear_attn()
{
int slinenum;
POSITION old_start_attnpos;
POSITION old_end_attnpos;
POSITION pos;
POSITION epos;
int moved = 0;
if (start_attnpos == NULL_POSITION)
return;
old_start_attnpos = start_attnpos;
old_end_attnpos = end_attnpos;
start_attnpos = end_attnpos = NULL_POSITION;
if (!can_goto_line)
{
repaint();
return;
}
if (squished)
repaint();
for (slinenum = TOP; slinenum < TOP + sc_height-1; slinenum++)
{
pos = position(slinenum);
if (pos == NULL_POSITION)
continue;
epos = position(slinenum+1);
if (pos < old_end_attnpos &&
(epos == NULL_POSITION || epos > old_start_attnpos))
{
(void) forw_line(pos);
goto_line(slinenum);
put_line();
moved = 1;
}
}
if (moved)
lower_left();
}
#endif
/*
* Hide search string highlighting.
*/
public void
undo_search()
{
if (!prev_pattern(&search_info))
{
error("No previous regular expression", NULL_PARG);
return;
}
#if HILITE_SEARCH
hide_hilite = !hide_hilite;
repaint_hilite(1);
#endif
}
#if HILITE_SEARCH
/*
* Clear the hilite list.
*/
public void
clr_hlist(anchor)
struct hilite *anchor;
{
struct hilite *hl;
struct hilite *nexthl;
for (hl = anchor->hl_first; hl != NULL; hl = nexthl)
{
nexthl = hl->hl_next;
free((void*)hl);
}
anchor->hl_first = NULL;
prep_startpos = prep_endpos = NULL_POSITION;
}
public void
clr_hilite()
{
clr_hlist(&hilite_anchor);
}
public void
clr_filter()
{
clr_hlist(&filter_anchor);
}
/*
* Should any characters in a specified range be highlighted?
*/
static int
is_hilited_range(pos, epos)
POSITION pos;
POSITION epos;
{
struct hilite *hl;
/*
* Look at each highlight and see if any part of it falls in the range.
*/
for (hl = hilite_anchor.hl_first; hl != NULL; hl = hl->hl_next)
{
if (hl->hl_endpos > pos &&
(epos == NULL_POSITION || epos > hl->hl_startpos))
return (1);
}
return (0);
}
/*
* Is a line "filtered" -- that is, should it be hidden?
*/
public int
is_filtered(pos)
POSITION pos;
{
struct hilite *hl;
if (ch_getflags() & CH_HELPFILE)
return (0);
/*
* Look at each filter and see if the start position
* equals the start position of the line.
*/
for (hl = filter_anchor.hl_first; hl != NULL; hl = hl->hl_next)
{
if (hl->hl_startpos == pos)
return (1);
}
return (0);
}
/*
* Should any characters in a specified range be highlighted?
* If nohide is nonzero, don't consider hide_hilite.
*/
public int
is_hilited(pos, epos, nohide, p_matches)
POSITION pos;
POSITION epos;
int nohide;
int *p_matches;
{
int match;
if (p_matches != NULL)
*p_matches = 0;
if (!status_col &&
start_attnpos != NULL_POSITION &&
pos < end_attnpos &&
(epos == NULL_POSITION || epos > start_attnpos))
/*
* The attn line overlaps this range.
*/
return (1);
match = is_hilited_range(pos, epos);
if (!match)
return (0);
if (p_matches != NULL)
/*
* Report matches, even if we're hiding highlights.
*/
*p_matches = 1;
if (hilite_search == 0)
/*
* Not doing highlighting.
*/
return (0);
if (!nohide && hide_hilite)
/*
* Highlighting is hidden.
*/
return (0);
return (1);
}
/*
* Add a new hilite to a hilite list.
*/
static void
add_hilite(anchor, hl)
struct hilite *anchor;
struct hilite *hl;
{
struct hilite *ihl;
/*
* Hilites are sorted in the list; find where new one belongs.
* Insert new one after ihl.
*/
for (ihl = anchor; ihl->hl_next != NULL; ihl = ihl->hl_next)
{
if (ihl->hl_next->hl_startpos > hl->hl_startpos)
break;
}
/*
* Truncate hilite so it doesn't overlap any existing ones
* above and below it.
*/
if (ihl != anchor)
hl->hl_startpos = MAXPOS(hl->hl_startpos, ihl->hl_endpos);
if (ihl->hl_next != NULL)
hl->hl_endpos = MINPOS(hl->hl_endpos, ihl->hl_next->hl_startpos);
if (hl->hl_startpos >= hl->hl_endpos)
{
/*
* Hilite was truncated out of existence.
*/
free(hl);
return;
}
hl->hl_next = ihl->hl_next;
ihl->hl_next = hl;
}
/*
* Make a hilite for each string in a physical line which matches
* the current pattern.
* sp,ep delimit the first match already found.
*/
static void
hilite_line(linepos, line, line_len, chpos, sp, ep, cvt_ops)
POSITION linepos;
char *line;
int line_len;
int *chpos;
char *sp;
char *ep;
int cvt_ops;
{
char *searchp;
char *line_end = line + line_len;
struct hilite *hl;
if (sp == NULL || ep == NULL)
return;
/*
* sp and ep delimit the first match in the line.
* Mark the corresponding file positions, then
* look for further matches and mark them.
* {{ This technique, of calling match_pattern on subsequent
* substrings of the line, may mark more than is correct
* if the pattern starts with "^". This bug is fixed
* for those regex functions that accept a notbol parameter
* (currently POSIX, PCRE and V8-with-regexec2). }}
*/
searchp = line;
do {
if (ep > sp)
{
hl = (struct hilite *) ecalloc(1, sizeof(struct hilite));
hl->hl_startpos = linepos + chpos[sp-line];
hl->hl_endpos = linepos + chpos[ep-line];
add_hilite(&hilite_anchor, hl);
}
/*
* If we matched more than zero characters,
* move to the first char after the string we matched.
* If we matched zero, just move to the next char.
*/
if (ep > searchp)
searchp = ep;
else if (searchp != line_end)
searchp++;
else /* end of line */
break;
} while (match_pattern(search_info.compiled, search_info.text,
searchp, line_end - searchp, &sp, &ep, 1, search_info.search_type));
}
#endif
/*
* Change the caseless-ness of searches.
* Updates the internal search state to reflect a change in the -i flag.
*/
public void
chg_caseless()
{
if (!is_ucase_pattern)
/*
* Pattern did not have uppercase.
* Just set the search caselessness to the global caselessness.
*/
is_caseless = caseless;
else
/*
* Pattern did have uppercase.
* Discard the pattern; we can't change search caselessness now.
*/
clear_pattern(&search_info);
}
#if HILITE_SEARCH
/*
* Find matching text which is currently on screen and highlight it.
*/
static void
hilite_screen()
{
struct scrpos scrpos;
get_scrpos(&scrpos);
if (scrpos.pos == NULL_POSITION)
return;
prep_hilite(scrpos.pos, position(BOTTOM_PLUS_ONE), -1);
repaint_hilite(1);
}
/*
* Change highlighting parameters.
*/
public void
chg_hilite()
{
/*
* Erase any highlights currently on screen.
*/
clr_hilite();
hide_hilite = 0;
if (hilite_search == OPT_ONPLUS)
/*
* Display highlights.
*/
hilite_screen();
}
#endif
/*
* Figure out where to start a search.
*/
static POSITION
search_pos(search_type)
int search_type;
{
POSITION pos;
int linenum;
if (empty_screen())
{
/*
* Start at the beginning (or end) of the file.
* The empty_screen() case is mainly for
* command line initiated searches;
* for example, "+/xyz" on the command line.
* Also for multi-file (SRCH_PAST_EOF) searches.
*/
if (search_type & SRCH_FORW)
{
pos = ch_zero();
} else
{
pos = ch_length();
if (pos == NULL_POSITION)
{
(void) ch_end_seek();
pos = ch_length();
}
}
} else if (how_search == OPT_ON)
{
/*
* Search does not include current screen.
*/
if (search_type & SRCH_FORW)
linenum = BOTTOM_PLUS_ONE;
else
linenum = TOP;
pos = position(linenum);
} else if (how_search == OPT_ONPLUS && !(search_type & SRCH_AFTER_TARGET))
{
/*
* Search includes all of displayed screen.
*/
if (search_type & SRCH_FORW)
linenum = TOP;
else
linenum = BOTTOM_PLUS_ONE;
pos = position(linenum);
} else
{
/*
* Search includes current screen.
* It starts at the jump target (if searching backwards),
* or at the jump target plus one (if forwards).
*/
linenum = adjsline(jump_sline);
pos = position(linenum);
if (search_type & SRCH_FORW)
pos = forw_raw_line(pos, (char **)NULL, (int *)NULL); /* plus one */
}
/*
* If the line is empty, look around for a plausible starting place.
*/
if (search_type & SRCH_FORW)
{
while (pos == NULL_POSITION)
{
if (++linenum >= sc_height)
break;
pos = position(linenum);
}
} else
{
while (pos == NULL_POSITION)
{
if (--linenum < 0)
break;
pos = position(linenum);
}
}
return (pos);
}
/*
* Search a subset of the file, specified by start/end position.
*/
static int
search_range(pos, endpos, search_type, matches, maxlines, plinepos, pendpos)
POSITION pos;
POSITION endpos;
int search_type;
int matches;
int maxlines;
POSITION *plinepos;
POSITION *pendpos;
{
char *line;
char *cline;
int line_len;
LINENUM linenum;
char *sp, *ep;
int line_match;
int cvt_ops;
int cvt_len;
int *chpos;
POSITION linepos, oldpos;
linenum = find_linenum(pos);
oldpos = pos;
for (;;)
{
/*
* Get lines until we find a matching one or until
* we hit end-of-file (or beginning-of-file if we're
* going backwards), or until we hit the end position.
*/
if (ABORT_SIGS())
{
/*
* A signal aborts the search.
*/
return (-1);
}
if ((endpos != NULL_POSITION && pos >= endpos) || maxlines == 0)
{
/*
* Reached end position without a match.
*/
if (pendpos != NULL)
*pendpos = pos;
return (matches);
}
if (maxlines > 0)
maxlines--;
if (search_type & SRCH_FORW)
{
/*
* Read the next line, and save the
* starting position of that line in linepos.
*/
linepos = pos;
pos = forw_raw_line(pos, &line, &line_len);
if (linenum != 0)
linenum++;
} else
{
/*
* Read the previous line and save the
* starting position of that line in linepos.
*/
pos = back_raw_line(pos, &line, &line_len);
linepos = pos;
if (linenum != 0)
linenum--;
}
if (pos == NULL_POSITION)
{
/*
* Reached EOF/BOF without a match.
*/
if (pendpos != NULL)
*pendpos = oldpos;
return (matches);
}
/*
* If we're using line numbers, we might as well
* remember the information we have now (the position
* and line number of the current line).
* Don't do it for every line because it slows down
* the search. Remember the line number only if
* we're "far" from the last place we remembered it.
*/
if (linenums && abs((int)(pos - oldpos)) > 2048)
add_lnum(linenum, pos);
oldpos = pos;
if (is_filtered(linepos))
continue;
/*
* If it's a caseless search, convert the line to lowercase.
* If we're doing backspace processing, delete backspaces.
*/
cvt_ops = get_cvt_ops();
cvt_len = cvt_length(line_len, cvt_ops);
cline = (char *) ecalloc(1, cvt_len);
chpos = cvt_alloc_chpos(cvt_len);
cvt_text(cline, line, chpos, &line_len, cvt_ops);
#if HILITE_SEARCH
/*
* Check to see if the line matches the filter pattern.
* If so, add an entry to the filter list.
*/
if ((search_type & SRCH_FIND_ALL) && prev_pattern(&filter_info)) {
int line_filter = match_pattern(filter_info.compiled, filter_info.text,
cline, line_len, &sp, &ep, 0, filter_info.search_type);
if (line_filter)
{
struct hilite *hl = (struct hilite *)
ecalloc(1, sizeof(struct hilite));
hl->hl_startpos = linepos;
hl->hl_endpos = pos;
add_hilite(&filter_anchor, hl);
}
}
#endif
/*
* Test the next line to see if we have a match.
* We are successful if we either want a match and got one,
* or if we want a non-match and got one.
*/
if (prev_pattern(&search_info))
{
line_match = match_pattern(search_info.compiled, search_info.text,
cline, line_len, &sp, &ep, 0, search_type);
if (line_match)
{
/*
* Got a match.
*/
if (search_type & SRCH_FIND_ALL)
{
#if HILITE_SEARCH
/*
* We are supposed to find all matches in the range.
* Just add the matches in this line to the
* hilite list and keep searching.
*/
hilite_line(linepos, cline, line_len, chpos, sp, ep, cvt_ops);
#endif
} else if (--matches <= 0)
{
/*
* Found the one match we're looking for.
* Return it.
*/
#if HILITE_SEARCH
if (hilite_search == OPT_ON)
{
/*
* Clear the hilite list and add only
* the matches in this one line.
*/
clr_hilite();
hilite_line(linepos, cline, line_len, chpos, sp, ep, cvt_ops);
}
#endif
free(cline);
free(chpos);
if (plinepos != NULL)
*plinepos = linepos;
return (0);
}
}
}
free(cline);
free(chpos);
}
}
/*
* search for a pattern in history. If found, compile that pattern.
*/
static int
hist_pattern(search_type)
int search_type;
{
#if CMD_HISTORY
char *pattern;
set_mlist(ml_search, 0);
pattern = cmd_lastpattern();
if (pattern == NULL)
return (0);
if (set_pattern(&search_info, pattern, search_type) < 0)
return (0);
#if HILITE_SEARCH
if (hilite_search == OPT_ONPLUS && !hide_hilite)
hilite_screen();
#endif
return (1);
#else /* CMD_HISTORY */
return (0);
#endif /* CMD_HISTORY */
}
/*
* Search for the n-th occurrence of a specified pattern,
* either forward or backward.
* Return the number of matches not yet found in this file
* (that is, n minus the number of matches found).
* Return -1 if the search should be aborted.
* Caller may continue the search in another file
* if less than n matches are found in this file.
*/
public int
search(search_type, pattern, n)
int search_type;
char *pattern;
int n;
{
POSITION pos;
if (pattern == NULL || *pattern == '\0')
{
/*
* A null pattern means use the previously compiled pattern.
*/
search_type |= SRCH_AFTER_TARGET;
if (!prev_pattern(&search_info) && !hist_pattern(search_type))
{
error("No previous regular expression", NULL_PARG);
return (-1);
}
if ((search_type & SRCH_NO_REGEX) !=
(search_info.search_type & SRCH_NO_REGEX))
{
error("Please re-enter search pattern", NULL_PARG);
return -1;
}
#if HILITE_SEARCH
if (hilite_search == OPT_ON)
{
/*
* Erase the highlights currently on screen.
* If the search fails, we'll redisplay them later.
*/
repaint_hilite(0);
}
if (hilite_search == OPT_ONPLUS && hide_hilite)
{
/*
* Highlight any matches currently on screen,
* before we actually start the search.
*/
hide_hilite = 0;
hilite_screen();
}
hide_hilite = 0;
#endif
} else
{
/*
* Compile the pattern.
*/
if (set_pattern(&search_info, pattern, search_type) < 0)
return (-1);
#if HILITE_SEARCH
if (hilite_search)
{
/*
* Erase the highlights currently on screen.
* Also permanently delete them from the hilite list.
*/
repaint_hilite(0);
hide_hilite = 0;
clr_hilite();
}
if (hilite_search == OPT_ONPLUS)
{
/*
* Highlight any matches currently on screen,
* before we actually start the search.
*/
hilite_screen();
}
#endif
}
/*
* Figure out where to start the search.
*/
pos = search_pos(search_type);
if (pos == NULL_POSITION)
{
/*
* Can't find anyplace to start searching from.
*/
if (search_type & SRCH_PAST_EOF)
return (n);
/* repaint(); -- why was this here? */
error("Nothing to search", NULL_PARG);
return (-1);
}
n = search_range(pos, NULL_POSITION, search_type, n, -1,
&pos, (POSITION*)NULL);
if (n != 0)
{
/*
* Search was unsuccessful.
*/
#if HILITE_SEARCH
if (hilite_search == OPT_ON && n > 0)
/*
* Redisplay old hilites.
*/
repaint_hilite(1);