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search.c
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search.c
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/*
* Copyright (C) 1984-2009 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 "position.h"
#include "charset.h"
#define MINPOS(a,b) (((a) < (b)) ? (a) : (b))
#define MAXPOS(a,b) (((a) > (b)) ? (a) : (b))
#if HAVE_POSIX_REGCOMP
#include <regex.h>
#ifdef REG_EXTENDED
#define REGCOMP_FLAG REG_EXTENDED
#else
#define REGCOMP_FLAG 0
#endif
#endif
#if HAVE_PCRE
#include <pcre.h>
#endif
#if HAVE_RE_COMP
char *re_comp();
int re_exec();
#endif
#if HAVE_REGCMP
char *regcmp();
char *regex();
extern char *__loc1;
#endif
#if HAVE_V8_REGCOMP
#include "regexp.h"
#endif
static int match();
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 int oldbot;
static POSITION prep_startpos;
static POSITION prep_endpos;
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.
*/
#if HAVE_POSIX_REGCOMP
#define DEFINE_PATTERN(name) static regex_t *name = NULL
#endif
#if HAVE_PCRE
#define DEFINE_PATTERN(name) pcre *name = NULL;
#endif
#if HAVE_RE_COMP
#define DEFINE_PATTERN(name) int name = 0;
#endif
#if HAVE_REGCMP
#define DEFINE_PATTERN(name) static char *name = NULL;
#endif
#if HAVE_V8_REGCOMP
#define DEFINE_PATTERN(name) static struct regexp *name = NULL;
#endif
DEFINE_PATTERN(search_pattern);
DEFINE_PATTERN(filter_pattern);
static int is_caseless;
static int is_ucase_pattern;
static int last_search_type;
static int last_filter_type;
static char *last_pattern = NULL;
#define CVT_TO_LC 01 /* Convert upper-case to lower-case */
#define CVT_BS 02 /* Do backspace processing */
#define CVT_CRLF 04 /* Remove CR after LF */
#define CVT_ANSI 010 /* Remove ANSI escape sequences */
/*
* Get the length of a buffer needed to convert a string.
*/
static int
cvt_length(len, ops)
int len;
int ops;
{
if (utf_mode)
/*
* Just copying a string in UTF-8 mode can cause it to grow
* in length.
* Six output bytes for one input byte is the worst case
* (and unfortunately is far more than is needed in any
* non-pathological situation, so this is very wasteful).
*/
len *= 6;
return len + 1;
}
/*
* Convert text. Perform the transformations specified by ops.
*/
static void
cvt_text(odst, osrc, lenp, ops)
char *odst;
char *osrc;
int *lenp;
int ops;
{
char *dst;
char *src;
register char *src_end;
LWCHAR ch;
if (lenp != NULL)
src_end = osrc + *lenp;
else
src_end = osrc + strlen(osrc);
for (src = osrc, dst = odst; src < src_end; )
{
ch = step_char(&src, +1, src_end);
if ((ops & CVT_TO_LC) && IS_UPPER(ch))
{
/* Convert uppercase to lowercase. */
put_wchar(&dst, TO_LOWER(ch));
} else if ((ops & CVT_BS) && ch == '\b' && dst > odst)
{
/* Delete backspace and preceding char. */
do {
dst--;
} while (dst > odst &&
!IS_ASCII_OCTET(*dst) && !IS_UTF8_LEAD(*dst));
} else if ((ops & CVT_ANSI) && IS_CSI_START(ch))
{
/* Skip to end of ANSI escape sequence. */
src++; /* skip the CSI start char */
while (src < src_end)
if (!is_ansi_middle(*src++))
break;
} else
/* Just copy. */
put_wchar(&dst, ch);
}
if ((ops & CVT_CRLF) && dst > odst && dst[-1] == '\r')
dst--;
*dst = '\0';
if (lenp != NULL)
*lenp = dst - odst;
}
/*
* Determine which conversions to perform.
*/
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);
}
/*
* 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);
}
/*
* Is there a previous (remembered) search pattern?
*/
static int
prev_pattern()
{
if (last_search_type & SRCH_NO_REGEX)
return (last_pattern != NULL);
#if HAVE_POSIX_REGCOMP
return (search_pattern != NULL);
#endif
#if HAVE_PCRE
return (search_pattern != NULL);
#endif
#if HAVE_RE_COMP
return (search_pattern != 0);
#endif
#if HAVE_REGCMP
return (search_pattern != NULL);
#endif
#if HAVE_V8_REGCOMP
return (search_pattern != NULL);
#endif
#if NO_REGEX
return (search_pattern != NULL);
#endif
}
#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);
#if 0
/*
* If any character in the line is highlighted,
* repaint the line.
*
* {{ This doesn't work -- if line is drawn with highlights
* which should be erased (e.g. toggle -i with status column),
* we must redraw the line even if it has no highlights.
* For now, just repaint every line. }}
*/
if (is_hilited(pos, epos, 1, NULL))
#endif
{
(void) forw_line(pos);
goto_line(slinenum);
put_line();
}
}
if (!oldbot)
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())
{
error("No previous regular expression", NULL_PARG);
return;
}
#if HILITE_SEARCH
hide_hilite = !hide_hilite;
repaint_hilite(1);
#endif
}
/*
* Compile a search pattern, for future use by match_pattern.
*/
static int
compile_pattern2(pattern, search_type, comp_pattern)
char *pattern;
int search_type;
void **comp_pattern;
{
if ((search_type & SRCH_NO_REGEX) == 0)
{
#if HAVE_POSIX_REGCOMP
regex_t *comp = (regex_t *) ecalloc(1, sizeof(regex_t));
regex_t **pcomp = (regex_t **) comp_pattern;
if (regcomp(comp, pattern, REGCOMP_FLAG))
{
free(comp);
error("Invalid pattern", NULL_PARG);
return (-1);
}
if (*pcomp != NULL)
regfree(*pcomp);
*pcomp = comp;
#endif
#if HAVE_PCRE
pcre *comp;
pcre **pcomp = (pcre **) comp_pattern;
const char *errstring;
int erroffset;
PARG parg;
comp = pcre_compile(pattern, 0,
&errstring, &erroffset, NULL);
if (comp == NULL)
{
parg.p_string = (char *) errstring;
error("%s", &parg);
return (-1);
}
*pcomp = comp;
#endif
#if HAVE_RE_COMP
PARG parg;
int *pcomp = (int *) comp_pattern;
if ((parg.p_string = re_comp(pattern)) != NULL)
{
error("%s", &parg);
return (-1);
}
*pcomp = 1;
#endif
#if HAVE_REGCMP
char *comp;
char **pcomp = (char **) comp_pattern;
if ((comp = regcmp(pattern, 0)) == NULL)
{
error("Invalid pattern", NULL_PARG);
return (-1);
}
if (pcomp != NULL)
free(*pcomp);
*pcomp = comp;
#endif
#if HAVE_V8_REGCOMP
struct regexp *comp;
struct regexp **pcomp = (struct regexp **) comp_pattern;
if ((comp = regcomp(pattern)) == NULL)
{
/*
* regcomp has already printed an error message
* via regerror().
*/
return (-1);
}
if (*pcomp != NULL)
free(*pcomp);
*pcomp = comp;
#endif
}
if (comp_pattern == (void **) &search_pattern)
{
if (last_pattern != NULL)
free(last_pattern);
last_pattern = (char *) calloc(1, strlen(pattern)+1);
if (last_pattern != NULL)
strcpy(last_pattern, pattern);
last_search_type = search_type;
} else
{
last_filter_type = search_type;
}
return (0);
}
/*
* Like compile_pattern2, but convert the pattern to lowercase if necessary.
*/
static int
compile_pattern(pattern, search_type, comp_pattern)
char *pattern;
int search_type;
void **comp_pattern;
{
char *cvt_pattern;
int result;
if (caseless != OPT_ONPLUS)
cvt_pattern = pattern;
else
{
cvt_pattern = (char*) ecalloc(1, cvt_length(strlen(pattern), CVT_TO_LC));
cvt_text(cvt_pattern, pattern, (int *)NULL, CVT_TO_LC);
}
result = compile_pattern2(cvt_pattern, search_type, comp_pattern);
if (cvt_pattern != pattern)
free(cvt_pattern);
return (result);
}
/*
* Forget that we have a compiled pattern.
*/
static void
uncompile_pattern(pattern)
void **pattern;
{
#if HAVE_POSIX_REGCOMP
regex_t **pcomp = (regex_t **) pattern;
if (*pcomp != NULL)
regfree(*pcomp);
*pcomp = NULL;
#endif
#if HAVE_PCRE
pcre **pcomp = (pcre **) pattern;
if (*pcomp != NULL)
pcre_free(*pcomp);
*pcomp = NULL;
#endif
#if HAVE_RE_COMP
int *pcomp = (int *) pattern;
*pcomp = 0;
#endif
#if HAVE_REGCMP
char **pcomp = (char **) pattern;
if (*pcomp != NULL)
free(*pcomp);
*pcomp = NULL;
#endif
#if HAVE_V8_REGCOMP
struct regexp **pcomp = (struct regexp **) pattern;
if (*pcomp != NULL)
free(*pcomp);
*pcomp = NULL;
#endif
}
static void
uncompile_search_pattern()
{
uncompile_pattern(&search_pattern);
last_pattern = NULL;
}
static void
uncompile_filter_pattern()
{
uncompile_pattern(&filter_pattern);
}
/*
* Is a compiled pattern null?
*/
static int
is_null_pattern(pattern)
void *pattern;
{
#if HAVE_POSIX_REGCOMP
return (pattern == NULL);
#endif
#if HAVE_PCRE
return (pattern == NULL);
#endif
#if HAVE_RE_COMP
return (pattern == 0);
#endif
#if HAVE_REGCMP
return (pattern == NULL);
#endif
#if HAVE_V8_REGCOMP
return (pattern == NULL);
#endif
}
/*
* Perform a pattern match with the previously compiled pattern.
* Set sp and ep to the start and end of the matched string.
*/
static int
match_pattern(pattern, line, line_len, sp, ep, notbol, search_type)
void *pattern;
char *line;
int line_len;
char **sp;
char **ep;
int notbol;
int search_type;
{
int matched;
#if HAVE_POSIX_REGCOMP
regex_t *spattern = (regex_t *) pattern;
#endif
#if HAVE_PCRE
pcre *spattern = (pcre *) pattern;
#endif
#if HAVE_RE_COMP
int spattern = (int) pattern;
#endif
#if HAVE_REGCMP
char *spattern = (char *) pattern;
#endif
#if HAVE_V8_REGCOMP
struct regexp *spattern = (struct regexp *) pattern;
#endif
if (search_type & SRCH_NO_REGEX)
return (match(last_pattern, strlen(last_pattern), line, line_len, sp, ep));
#if HAVE_POSIX_REGCOMP
{
regmatch_t rm;
int flags = (notbol) ? REG_NOTBOL : 0;
matched = !regexec(spattern, line, 1, &rm, flags);
if (matched)
{
#ifndef __WATCOMC__
*sp = line + rm.rm_so;
*ep = line + rm.rm_eo;
#else
*sp = rm.rm_sp;
*ep = rm.rm_ep;
#endif
}
}
#endif
#if HAVE_PCRE
{
int flags = (notbol) ? PCRE_NOTBOL : 0;
int ovector[3];
matched = pcre_exec(spattern, NULL, line, line_len,
0, flags, ovector, 3) >= 0;
if (matched)
{
*sp = line + ovector[0];
*ep = line + ovector[1];
}
}
#endif
#if HAVE_RE_COMP
matched = (re_exec(line) == 1);
/*
* re_exec doesn't seem to provide a way to get the matched string.
*/
*sp = *ep = NULL;
#endif
#if HAVE_REGCMP
*ep = regex(spattern, line);
matched = (*ep != NULL);
if (matched)
*sp = __loc1;
#endif
#if HAVE_V8_REGCOMP
#if HAVE_REGEXEC2
matched = regexec2(spattern, line, notbol);
#else
matched = regexec(spattern, line);
#endif
if (matched)
{
*sp = spattern->startp[0];
*ep = spattern->endp[0];
}
#endif
#if NO_REGEX
matched = match(last_pattern, strlen(last_pattern), line, line_len, sp, ep);
#endif
matched = (!(search_type & SRCH_NO_MATCH) && matched) ||
((search_type & SRCH_NO_MATCH) && !matched);
return (matched);
}
#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;
}
/*
* Adjust hl_startpos & hl_endpos to account for processing by cvt_text.
*/
static void
adj_hilite(anchor, linepos, cvt_ops)
struct hilite *anchor;
POSITION linepos;
int cvt_ops;
{
char *line;
char *oline;
int line_len;
char *line_end;
struct hilite *hl;
int checkstart;
POSITION opos;
POSITION npos;
POSITION hl_opos;
POSITION hl_npos;
LWCHAR ch;
int ncwidth;
/*
* The line was already scanned and hilites were added (in hilite_line).
* But it was assumed that each char position in the line
* correponds to one char position in the file.
* This may not be true if cvt_text modified the line.
* Get the raw line again. Look at each character.
*/
(void) forw_raw_line(linepos, &line, &line_len);
line_end = line + line_len;
opos = npos = linepos;
hl = anchor->hl_first;
if (hl == NULL)
return;
hl_opos = hl_npos = hl->hl_startpos;
checkstart = TRUE;
while (hl != NULL && line < line_end)
{
/*
* See if we need to adjust the current hl_startpos or
* hl_endpos. After adjusting startpos[i], move to endpos[i].
* After adjusting endpos[i], move to startpos[i+1].
* The hilite list must be sorted thus:
* startpos[0] < endpos[0] <= startpos[1] < endpos[1] <= etc.
*/
oline = line;
ch = step_char(&line, +1, line_end);
ncwidth = line - oline;
npos += ncwidth;
/* Figure out how this char was processed by cvt_text. */
if ((cvt_ops & CVT_BS) && ch == '\b')
{
/* Skip the backspace and the following char. */
oline = line;
ch = step_char(&line, +1, line_end);
ncwidth = line - oline;
npos += ncwidth;
} else if ((cvt_ops & CVT_TO_LC) && IS_UPPER(ch))
{
/* Converted uppercase to lower.
* Note that this may have changed the number of bytes
* that the character occupies. */
char dbuf[6];
char *dst = dbuf;
put_wchar(&dst, TO_LOWER(ch));
opos += dst - dbuf;
} else if ((cvt_ops & CVT_ANSI) && IS_CSI_START(ch))
{
/* Skip to end of ANSI escape sequence. */
line++; /* skip the CSI start char */
npos++;
while (line < line_end)
{
npos++;
if (!is_ansi_middle(*line++))
break;
}
} else
{
/* Ordinary unprocessed character. */
opos += ncwidth;
}
if (opos == hl_opos) {
/* Adjust highlight position. */
hl_npos = npos;
}
if (opos > hl_opos)
{
/*
* We've moved past the highlight position; store the
* adjusted highlight position and move to the next highlight.
*/
if (checkstart)
{
hl->hl_startpos = hl_npos;
hl_opos = hl->hl_endpos;
checkstart = FALSE;
} else
{
hl->hl_endpos = hl_npos;
hl = hl->hl_next;
if (hl != NULL)
hl_opos = hl->hl_startpos;
checkstart = TRUE;
}
hl_npos = npos;
}
}
}
/*
* 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, sp, ep, cvt_ops)
POSITION linepos;
char *line;
int line_len;
char *sp;
char *ep;
int cvt_ops;
{
char *searchp;
char *line_end = line + line_len;
struct hilite *hl;
struct hilite hilites;
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;
/*
* Put the hilites into a temporary list until they're adjusted.
*/
hilites.hl_first = NULL;
do {
if (ep > sp)
{
/*
* Assume that each char position in the "line"
* buffer corresponds to one char position in the file.