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mc/lib/search/regex.c
Andrew Borodin ddd645526a Update copyright years.
2018-02-04 11:30:22 +03:00

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/*
Search text engine.
Regex search
Copyright (C) 2009-2018
Free Software Foundation, Inc.
Written by:
Slava Zanko <slavazanko@gmail.com>, 2009, 2010, 2011, 2013
Vitaliy Filippov <vitalif@yourcmc.ru>, 2011
Andrew Borodin <aborodin@vmail.ru>, 2013-2015
This file is part of the Midnight Commander.
The Midnight Commander 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 3 of the License,
or (at your option) any later version.
The Midnight Commander 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, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdlib.h>
#include "lib/global.h"
#include "lib/strutil.h"
#include "lib/search.h"
#include "lib/strescape.h"
#include "lib/util.h" /* MC_PTR_FREE */
#include "internal.h"
/*** global variables ****************************************************************************/
/*** file scope macro definitions ****************************************************************/
#define REPLACE_PREPARE_T_NOTHING_SPECIAL -1
#define REPLACE_PREPARE_T_REPLACE_FLAG -2
#define REPLACE_PREPARE_T_ESCAPE_SEQ -3
/*** file scope type declarations ****************************************************************/
typedef enum
{
REPLACE_T_NO_TRANSFORM = 0,
REPLACE_T_UPP_TRANSFORM_CHAR = 1,
REPLACE_T_LOW_TRANSFORM_CHAR = 2,
REPLACE_T_UPP_TRANSFORM = 4,
REPLACE_T_LOW_TRANSFORM = 8
} replace_transform_type_t;
/*** file scope variables ************************************************************************/
/*** file scope functions ************************************************************************/
static gboolean
mc_search__regex_str_append_if_special (GString * copy_to, const GString * regex_str,
gsize * offset)
{
const char *special_chars[] = {
"\\s", "\\S",
"\\d", "\\D",
"\\b", "\\B",
"\\w", "\\W",
"\\t", "\\n",
"\\r", "\\f",
"\\a", "\\e",
"\\x", "\\X",
"\\c", "\\C",
"\\l", "\\L",
"\\u", "\\U",
"\\E", "\\Q",
NULL
};
char *tmp_regex_str;
const char **spec_chr;
tmp_regex_str = &(regex_str->str[*offset]);
for (spec_chr = special_chars; *spec_chr != NULL; spec_chr++)
{
gsize spec_chr_len;
spec_chr_len = strlen (*spec_chr);
if (strncmp (tmp_regex_str, *spec_chr, spec_chr_len) == 0
&& !strutils_is_char_escaped (regex_str->str, tmp_regex_str))
{
if (strncmp ("\\x", *spec_chr, spec_chr_len) == 0)
{
if (tmp_regex_str[spec_chr_len] != '{')
spec_chr_len += 2;
else
{
while ((spec_chr_len < regex_str->len - *offset)
&& tmp_regex_str[spec_chr_len] != '}')
spec_chr_len++;
if (tmp_regex_str[spec_chr_len] == '}')
spec_chr_len++;
}
}
g_string_append_len (copy_to, tmp_regex_str, spec_chr_len);
*offset += spec_chr_len;
return TRUE;
}
}
return FALSE;
}
/* --------------------------------------------------------------------------------------------- */
static void
mc_search__cond_struct_new_regex_hex_add (const char *charset, GString * str_to,
const char *one_char, gsize str_len)
{
GString *upp, *low;
gsize loop;
upp = mc_search__toupper_case_str (charset, one_char, str_len);
low = mc_search__tolower_case_str (charset, one_char, str_len);
for (loop = 0; loop < upp->len; loop++)
{
gchar tmp_str[10 + 1]; /* longest content is "[\\x%02X\\x%02X]" */
gint tmp_len;
if (loop >= low->len || upp->str[loop] == low->str[loop])
tmp_len =
g_snprintf (tmp_str, sizeof (tmp_str), "\\x%02X", (unsigned char) upp->str[loop]);
else
tmp_len =
g_snprintf (tmp_str, sizeof (tmp_str), "[\\x%02X\\x%02X]",
(unsigned char) upp->str[loop], (unsigned char) low->str[loop]);
g_string_append_len (str_to, tmp_str, tmp_len);
}
g_string_free (upp, TRUE);
g_string_free (low, TRUE);
}
/* --------------------------------------------------------------------------------------------- */
static void
mc_search__cond_struct_new_regex_accum_append (const char *charset, GString * str_to,
GString * str_from)
{
GString *recoded_part;
gsize loop = 0;
recoded_part = g_string_sized_new (32);
while (loop < str_from->len)
{
gchar *one_char;
gsize one_char_len;
gboolean just_letters;
one_char =
mc_search__get_one_symbol (charset, &(str_from->str[loop]),
MIN (str_from->len - loop, 6), &just_letters);
one_char_len = strlen (one_char);
if (one_char_len == 0)
loop++;
else
{
loop += one_char_len;
if (just_letters)
mc_search__cond_struct_new_regex_hex_add (charset, recoded_part, one_char,
one_char_len);
else
g_string_append_len (recoded_part, one_char, one_char_len);
}
g_free (one_char);
}
g_string_append_len (str_to, recoded_part->str, recoded_part->len);
g_string_free (recoded_part, TRUE);
g_string_set_size (str_from, 0);
}
/* --------------------------------------------------------------------------------------------- */
/**
* Creates a case-insensitive version of a regex pattern.
*
* For example (assuming ASCII charset): given "\\bHello!\\xAB", returns
* "\\b[Hh][Ee][Ll][Ll][Oo]!\\xAB" (this example is for easier reading; in
* reality hex codes are used instead of letters).
*
* This function knows not to ruin special regex symbols.
*
* This function is used when working with non-UTF-8 charsets: GLib's
* regex engine doesn't understand such charsets and therefore can't do
* this job itself.
*/
static GString *
mc_search__cond_struct_new_regex_ci_str (const char *charset, const GString * astr)
{
GString *accumulator, *spec_char, *ret_str;
gsize loop;
ret_str = g_string_sized_new (64);
accumulator = g_string_sized_new (64);
spec_char = g_string_sized_new (64);
loop = 0;
while (loop <= astr->len)
{
if (mc_search__regex_str_append_if_special (spec_char, astr, &loop))
{
mc_search__cond_struct_new_regex_accum_append (charset, ret_str, accumulator);
g_string_append_len (ret_str, spec_char->str, spec_char->len);
g_string_set_size (spec_char, 0);
continue;
}
if (astr->str[loop] == '[' && !strutils_is_char_escaped (astr->str, &(astr->str[loop])))
{
mc_search__cond_struct_new_regex_accum_append (charset, ret_str, accumulator);
while (loop < astr->len && !(astr->str[loop] == ']'
&& !strutils_is_char_escaped (astr->str,
&(astr->str[loop]))))
{
g_string_append_c (ret_str, astr->str[loop]);
loop++;
}
g_string_append_c (ret_str, astr->str[loop]);
loop++;
continue;
}
/*
TODO: handle [ and ]
*/
g_string_append_c (accumulator, astr->str[loop]);
loop++;
}
mc_search__cond_struct_new_regex_accum_append (charset, ret_str, accumulator);
g_string_free (accumulator, TRUE);
g_string_free (spec_char, TRUE);
return ret_str;
}
/* --------------------------------------------------------------------------------------------- */
#ifdef SEARCH_TYPE_GLIB
/* A thin wrapper above g_regex_match_full that makes sure the string passed
* to it is valid UTF-8 (unless G_REGEX_RAW compile flag was set), as it is a
* requirement by glib and it might crash otherwise. See: mc ticket 3449.
* Be careful: there might be embedded NULs in the strings. */
static gboolean
mc_search__g_regex_match_full_safe (const GRegex * regex,
const gchar * string,
gssize string_len,
gint start_position,
GRegexMatchFlags match_options,
GMatchInfo ** match_info, GError ** error)
{
char *string_safe, *p, *end;
gboolean ret;
if (string_len < 0)
string_len = strlen (string);
if ((g_regex_get_compile_flags (regex) & G_REGEX_RAW)
|| g_utf8_validate (string, string_len, NULL))
{
return g_regex_match_full (regex, string, string_len, start_position, match_options,
match_info, error);
}
/* Correctly handle embedded NULs while copying */
p = string_safe = g_malloc (string_len);
memcpy (string_safe, string, string_len);
end = p + string_len;
while (p < end)
{
gunichar c = g_utf8_get_char_validated (p, -1);
if (c != (gunichar) (-1) && c != (gunichar) (-2))
{
p = g_utf8_next_char (p);
}
else
{
/* U+FFFD would be the proper choice, but then we'd have to
maintain mapping between old and new offsets.
So rather do a byte by byte replacement. */
*p++ = '\0';
}
}
ret =
g_regex_match_full (regex, string_safe, string_len, start_position, match_options,
match_info, error);
g_free (string_safe);
return ret;
}
#endif /* SEARCH_TYPE_GLIB */
/* --------------------------------------------------------------------------------------------- */
static mc_search__found_cond_t
mc_search__regex_found_cond_one (mc_search_t * lc_mc_search, mc_search_regex_t * regex,
GString * search_str)
{
#ifdef SEARCH_TYPE_GLIB
GError *mcerror = NULL;
if (!mc_search__g_regex_match_full_safe
(regex, search_str->str, search_str->len, 0, G_REGEX_MATCH_NEWLINE_ANY,
&lc_mc_search->regex_match_info, &mcerror))
{
g_match_info_free (lc_mc_search->regex_match_info);
lc_mc_search->regex_match_info = NULL;
if (mcerror != NULL)
{
lc_mc_search->error = MC_SEARCH_E_REGEX;
g_free (lc_mc_search->error_str);
lc_mc_search->error_str =
str_conv_gerror_message (mcerror, _("Regular expression error"));
g_error_free (mcerror);
return COND__FOUND_ERROR;
}
return COND__NOT_FOUND;
}
lc_mc_search->num_results = g_match_info_get_match_count (lc_mc_search->regex_match_info);
#else /* SEARCH_TYPE_GLIB */
lc_mc_search->num_results = pcre_exec (regex, lc_mc_search->regex_match_info,
search_str->str, search_str->len, 0, 0,
lc_mc_search->iovector, MC_SEARCH__NUM_REPLACE_ARGS);
if (lc_mc_search->num_results < 0)
{
return COND__NOT_FOUND;
}
#endif /* SEARCH_TYPE_GLIB */
return COND__FOUND_OK;
}
/* --------------------------------------------------------------------------------------------- */
static mc_search__found_cond_t
mc_search__regex_found_cond (mc_search_t * lc_mc_search, GString * search_str)
{
gsize loop1;
for (loop1 = 0; loop1 < lc_mc_search->conditions->len; loop1++)
{
mc_search_cond_t *mc_search_cond;
mc_search__found_cond_t ret;
mc_search_cond = (mc_search_cond_t *) g_ptr_array_index (lc_mc_search->conditions, loop1);
if (!mc_search_cond->regex_handle)
continue;
ret =
mc_search__regex_found_cond_one (lc_mc_search, mc_search_cond->regex_handle,
search_str);
if (ret != COND__NOT_FOUND)
return ret;
}
return COND__NOT_ALL_FOUND;
}
/* --------------------------------------------------------------------------------------------- */
static int
mc_search_regex__get_max_num_of_replace_tokens (const gchar * str, gsize len)
{
int max_token = 0;
gsize loop;
for (loop = 0; loop < len - 1; loop++)
{
if (str[loop] == '\\' && g_ascii_isdigit (str[loop + 1]))
{
if (strutils_is_char_escaped (str, &str[loop]))
continue;
if (max_token < str[loop + 1] - '0')
max_token = str[loop + 1] - '0';
continue;
}
if (str[loop] == '$' && str[loop + 1] == '{')
{
gsize tmp_len;
if (strutils_is_char_escaped (str, &str[loop]))
continue;
for (tmp_len = 0;
loop + tmp_len + 2 < len && (str[loop + 2 + tmp_len] & (char) 0xf0) == 0x30;
tmp_len++);
if (str[loop + 2 + tmp_len] == '}')
{
int tmp_token;
char *tmp_str;
tmp_str = g_strndup (&str[loop + 2], tmp_len);
tmp_token = atoi (tmp_str);
if (max_token < tmp_token)
max_token = tmp_token;
g_free (tmp_str);
}
}
}
return max_token;
}
/* --------------------------------------------------------------------------------------------- */
static char *
mc_search_regex__get_token_by_num (const mc_search_t * lc_mc_search, gsize lc_index)
{
int fnd_start = 0, fnd_end = 0;
#ifdef SEARCH_TYPE_GLIB
g_match_info_fetch_pos (lc_mc_search->regex_match_info, lc_index, &fnd_start, &fnd_end);
#else /* SEARCH_TYPE_GLIB */
fnd_start = lc_mc_search->iovector[lc_index * 2 + 0];
fnd_end = lc_mc_search->iovector[lc_index * 2 + 1];
#endif /* SEARCH_TYPE_GLIB */
if (fnd_end == fnd_start)
return g_strdup ("");
return g_strndup (lc_mc_search->regex_buffer->str + fnd_start, fnd_end - fnd_start);
}
/* --------------------------------------------------------------------------------------------- */
static gboolean
mc_search_regex__replace_handle_esc_seq (const GString * replace_str, const gsize current_pos,
gsize * skip_len, int *ret)
{
char *curr_str = &(replace_str->str[current_pos]);
char c = curr_str[1];
if (replace_str->len > current_pos + 2)
{
if (c == '{')
{
for (*skip_len = 2; /* \{ */
current_pos + *skip_len < replace_str->len && curr_str[*skip_len] >= '0'
&& curr_str[*skip_len] <= '7'; (*skip_len)++)
;
if (current_pos + *skip_len < replace_str->len && curr_str[*skip_len] == '}')
{
(*skip_len)++;
*ret = REPLACE_PREPARE_T_ESCAPE_SEQ;
return FALSE;
}
else
{
*ret = REPLACE_PREPARE_T_NOTHING_SPECIAL;
return TRUE;
}
}
if (c == 'x')
{
*skip_len = 2; /* \x */
c = curr_str[2];
if (c == '{')
{
for (*skip_len = 3; /* \x{ */
current_pos + *skip_len < replace_str->len
&& g_ascii_isxdigit ((guchar) curr_str[*skip_len]); (*skip_len)++)
;
if (current_pos + *skip_len < replace_str->len && curr_str[*skip_len] == '}')
{
(*skip_len)++;
*ret = REPLACE_PREPARE_T_ESCAPE_SEQ;
return FALSE;
}
else
{
*ret = REPLACE_PREPARE_T_NOTHING_SPECIAL;
return TRUE;
}
}
else if (!g_ascii_isxdigit ((guchar) c))
{
*skip_len = 2; /* \x without number behind */
*ret = REPLACE_PREPARE_T_NOTHING_SPECIAL;
return FALSE;
}
else
{
c = curr_str[3];
if (!g_ascii_isxdigit ((guchar) c))
*skip_len = 3; /* \xH */
else
*skip_len = 4; /* \xHH */
*ret = REPLACE_PREPARE_T_ESCAPE_SEQ;
return FALSE;
}
}
}
if (strchr ("ntvbrfa", c) != NULL)
{
*skip_len = 2;
*ret = REPLACE_PREPARE_T_ESCAPE_SEQ;
return FALSE;
}
return TRUE;
}
/* --------------------------------------------------------------------------------------------- */
static int
mc_search_regex__process_replace_str (const GString * replace_str, const gsize current_pos,
gsize * skip_len, replace_transform_type_t * replace_flags)
{
int ret = -1;
const char *curr_str = &(replace_str->str[current_pos]);
if (current_pos > replace_str->len)
return REPLACE_PREPARE_T_NOTHING_SPECIAL;
*skip_len = 0;
if (replace_str->len > current_pos + 2 && curr_str[0] == '$' && curr_str[1] == '{'
&& (curr_str[2] & (char) 0xf0) == 0x30)
{
char *tmp_str;
if (strutils_is_char_escaped (replace_str->str, curr_str))
{
*skip_len = 1;
return REPLACE_PREPARE_T_NOTHING_SPECIAL;
}
for (*skip_len = 0;
current_pos + *skip_len + 2 < replace_str->len
&& (curr_str[2 + *skip_len] & (char) 0xf0) == 0x30; (*skip_len)++)
;
if (curr_str[2 + *skip_len] != '}')
return REPLACE_PREPARE_T_NOTHING_SPECIAL;
tmp_str = g_strndup (curr_str + 2, *skip_len);
if (tmp_str == NULL)
return REPLACE_PREPARE_T_NOTHING_SPECIAL;
ret = atoi (tmp_str);
g_free (tmp_str);
*skip_len += 3; /* ${} */
return ret; /* capture buffer index >= 0 */
}
if (curr_str[0] == '\\' && replace_str->len > current_pos + 1)
{
if (strutils_is_char_escaped (replace_str->str, curr_str))
{
*skip_len = 1;
return REPLACE_PREPARE_T_NOTHING_SPECIAL;
}
if (g_ascii_isdigit (curr_str[1]))
{
ret = g_ascii_digit_value (curr_str[1]); /* capture buffer index >= 0 */
*skip_len = 2; /* \\ and one digit */
return ret;
}
if (!mc_search_regex__replace_handle_esc_seq (replace_str, current_pos, skip_len, &ret))
return ret;
ret = REPLACE_PREPARE_T_REPLACE_FLAG;
*skip_len += 2;
switch (curr_str[1])
{
case 'U':
*replace_flags |= REPLACE_T_UPP_TRANSFORM;
*replace_flags &= ~REPLACE_T_LOW_TRANSFORM;
break;
case 'u':
*replace_flags |= REPLACE_T_UPP_TRANSFORM_CHAR;
break;
case 'L':
*replace_flags |= REPLACE_T_LOW_TRANSFORM;
*replace_flags &= ~REPLACE_T_UPP_TRANSFORM;
break;
case 'l':
*replace_flags |= REPLACE_T_LOW_TRANSFORM_CHAR;
break;
case 'E':
*replace_flags = REPLACE_T_NO_TRANSFORM;
break;
default:
ret = REPLACE_PREPARE_T_NOTHING_SPECIAL;
break;
}
}
return ret;
}
/* --------------------------------------------------------------------------------------------- */
static void
mc_search_regex__process_append_str (GString * dest_str, const char *from, gsize len,
replace_transform_type_t * replace_flags)
{
gsize loop;
gsize char_len;
if (len == (gsize) (-1))
len = strlen (from);
if (*replace_flags == REPLACE_T_NO_TRANSFORM)
{
g_string_append_len (dest_str, from, len);
return;
}
for (loop = 0; loop < len; loop += char_len)
{
GString *tmp_string = NULL;
char *tmp_str;
tmp_str = mc_search__get_one_symbol (NULL, from + loop, len - loop, NULL);
char_len = strlen (tmp_str);
if ((*replace_flags & REPLACE_T_UPP_TRANSFORM_CHAR) != 0)
{
*replace_flags &= ~REPLACE_T_UPP_TRANSFORM_CHAR;
tmp_string = mc_search__toupper_case_str (NULL, tmp_str, char_len);
g_string_append_len (dest_str, tmp_string->str, tmp_string->len);
g_string_free (tmp_string, TRUE);
}
else if ((*replace_flags & REPLACE_T_LOW_TRANSFORM_CHAR) != 0)
{
*replace_flags &= ~REPLACE_T_LOW_TRANSFORM_CHAR;
tmp_string = mc_search__tolower_case_str (NULL, tmp_str, char_len);
g_string_append_len (dest_str, tmp_string->str, tmp_string->len);
g_string_free (tmp_string, TRUE);
}
else if ((*replace_flags & REPLACE_T_UPP_TRANSFORM) != 0)
{
tmp_string = mc_search__toupper_case_str (NULL, tmp_str, char_len);
g_string_append_len (dest_str, tmp_string->str, tmp_string->len);
g_string_free (tmp_string, TRUE);
}
else if ((*replace_flags & REPLACE_T_LOW_TRANSFORM) != 0)
{
tmp_string = mc_search__tolower_case_str (NULL, tmp_str, char_len);
g_string_append_len (dest_str, tmp_string->str, tmp_string->len);
g_string_free (tmp_string, TRUE);
}
g_free (tmp_str);
}
}
/* --------------------------------------------------------------------------------------------- */
static void
mc_search_regex__process_escape_sequence (GString * dest_str, const char *from, gsize len,
replace_transform_type_t * replace_flags,
gboolean is_utf8)
{
gsize i = 0;
unsigned int c = 0;
char b;
if (len == (gsize) (-1))
len = strlen (from);
if (len == 0)
return;
if (from[i] == '{')
i++;
if (i >= len)
return;
if (from[i] == 'x')
{
i++;
if (i < len && from[i] == '{')
i++;
for (; i < len; i++)
{
if (from[i] >= '0' && from[i] <= '9')
c = c * 16 + from[i] - '0';
else if (from[i] >= 'a' && from[i] <= 'f')
c = c * 16 + 10 + from[i] - 'a';
else if (from[i] >= 'A' && from[i] <= 'F')
c = c * 16 + 10 + from[i] - 'A';
else
break;
}
}
else if (from[i] >= '0' && from[i] <= '7')
for (; i < len && from[i] >= '0' && from[i] <= '7'; i++)
c = c * 8 + from[i] - '0';
else
{
switch (from[i])
{
case 'n':
c = '\n';
break;
case 't':
c = '\t';
break;
case 'v':
c = '\v';
break;
case 'b':
c = '\b';
break;
case 'r':
c = '\r';
break;
case 'f':
c = '\f';
break;
case 'a':
c = '\a';
break;
default:
mc_search_regex__process_append_str (dest_str, from, len, replace_flags);
return;
}
}
if (c < 0x80 || !is_utf8)
g_string_append_c (dest_str, (char) c);
else if (c < 0x800)
{
b = 0xC0 | (c >> 6);
g_string_append_c (dest_str, b);
b = 0x80 | (c & 0x3F);
g_string_append_c (dest_str, b);
}
else if (c < 0x10000)
{
b = 0xE0 | (c >> 12);
g_string_append_c (dest_str, b);
b = 0x80 | ((c >> 6) & 0x3F);
g_string_append_c (dest_str, b);
b = 0x80 | (c & 0x3F);
g_string_append_c (dest_str, b);
}
else if (c < 0x10FFFF)
{
b = 0xF0 | (c >> 16);
g_string_append_c (dest_str, b);
b = 0x80 | ((c >> 12) & 0x3F);
g_string_append_c (dest_str, b);
b = 0x80 | ((c >> 6) & 0x3F);
g_string_append_c (dest_str, b);
b = 0x80 | (c & 0x3F);
g_string_append_c (dest_str, b);
}
}
/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
/* --------------------------------------------------------------------------------------------- */
void
mc_search__cond_struct_new_init_regex (const char *charset, mc_search_t * lc_mc_search,
mc_search_cond_t * mc_search_cond)
{
if (lc_mc_search->whole_words && !lc_mc_search->is_entire_line)
{
/* NOTE: \b as word boundary doesn't allow search
* whole words with non-ASCII symbols.
* Update: Is it still true nowadays? Probably not. #2396, #3524 */
g_string_prepend (mc_search_cond->str, "(?<![\\p{L}\\p{N}_])");
g_string_append (mc_search_cond->str, "(?![\\p{L}\\p{N}_])");
}
{
#ifdef SEARCH_TYPE_GLIB
GError *mcerror = NULL;
GRegexCompileFlags g_regex_options = G_REGEX_OPTIMIZE | G_REGEX_DOTALL;
if (str_isutf8 (charset) && mc_global.utf8_display)
{
if (!lc_mc_search->is_case_sensitive)
g_regex_options |= G_REGEX_CASELESS;
}
else
{
g_regex_options |= G_REGEX_RAW;
if (!lc_mc_search->is_case_sensitive)
{
GString *tmp;
tmp = mc_search_cond->str;
mc_search_cond->str = mc_search__cond_struct_new_regex_ci_str (charset, tmp);
g_string_free (tmp, TRUE);
}
}
mc_search_cond->regex_handle =
g_regex_new (mc_search_cond->str->str, g_regex_options, 0, &mcerror);
if (mcerror != NULL)
{
lc_mc_search->error = MC_SEARCH_E_REGEX_COMPILE;
g_free (lc_mc_search->error_str);
lc_mc_search->error_str =
str_conv_gerror_message (mcerror, _("Regular expression error"));
g_error_free (mcerror);
return;
}
#else /* SEARCH_TYPE_GLIB */
const char *error;
int erroffset;
int pcre_options = PCRE_EXTRA | PCRE_MULTILINE;
if (str_isutf8 (charset) && mc_global.utf8_display)
{
pcre_options |= PCRE_UTF8;
if (!lc_mc_search->is_case_sensitive)
pcre_options |= PCRE_CASELESS;
}
else
{
if (!lc_mc_search->is_case_sensitive)
{
GString *tmp;
tmp = mc_search_cond->str;
mc_search_cond->str = mc_search__cond_struct_new_regex_ci_str (charset, tmp);
g_string_free (tmp, TRUE);
}
}
mc_search_cond->regex_handle =
pcre_compile (mc_search_cond->str->str, pcre_options, &error, &erroffset, NULL);
if (mc_search_cond->regex_handle == NULL)
{
mc_search_set_error (lc_mc_search, MC_SEARCH_E_REGEX_COMPILE, "%s", error);
return;
}
lc_mc_search->regex_match_info = pcre_study (mc_search_cond->regex_handle, 0, &error);
if (lc_mc_search->regex_match_info == NULL && error != NULL)
{
mc_search_set_error (lc_mc_search, MC_SEARCH_E_REGEX_COMPILE, "%s", error);
MC_PTR_FREE (mc_search_cond->regex_handle);
return;
}
#endif /* SEARCH_TYPE_GLIB */
}
lc_mc_search->is_utf8 = str_isutf8 (charset);
}
/* --------------------------------------------------------------------------------------------- */
gboolean
mc_search__run_regex (mc_search_t * lc_mc_search, const void *user_data,
gsize start_search, gsize end_search, gsize * found_len)
{
mc_search_cbret_t ret = MC_SEARCH_CB_NOTFOUND;
gsize current_pos, virtual_pos;
gint start_pos;
gint end_pos;
if (lc_mc_search->regex_buffer != NULL)
g_string_set_size (lc_mc_search->regex_buffer, 0);
else
lc_mc_search->regex_buffer = g_string_sized_new (64);
virtual_pos = current_pos = start_search;
while (virtual_pos <= end_search)
{
g_string_set_size (lc_mc_search->regex_buffer, 0);
lc_mc_search->start_buffer = current_pos;
if (lc_mc_search->search_fn != NULL)
{
while (TRUE)
{
int current_chr = '\n'; /* stop search symbol */
ret = lc_mc_search->search_fn (user_data, current_pos, &current_chr);
if (ret == MC_SEARCH_CB_ABORT)
break;
if (ret == MC_SEARCH_CB_INVALID)
continue;
current_pos++;
if (ret == MC_SEARCH_CB_SKIP)
continue;
virtual_pos++;
g_string_append_c (lc_mc_search->regex_buffer, (char) current_chr);
if ((char) current_chr == '\n' || virtual_pos > end_search)
break;
}
}
else
{
/* optimization for standard case (for search from file manager)
* where there is no MC_SEARCH_CB_INVALID or MC_SEARCH_CB_SKIP
* return codes, so we can copy line at regex buffer all at once
*/
while (TRUE)
{
const char current_chr = ((const char *) user_data)[current_pos];
if (current_chr == '\0')
break;
current_pos++;
if (current_chr == '\n' || current_pos > end_search)
break;
}
/* use virtual_pos as index of start of current chunk */
g_string_append_len (lc_mc_search->regex_buffer, (const char *) user_data + virtual_pos,
current_pos - virtual_pos);
virtual_pos = current_pos;
}
switch (mc_search__regex_found_cond (lc_mc_search, lc_mc_search->regex_buffer))
{
case COND__FOUND_OK:
#ifdef SEARCH_TYPE_GLIB
g_match_info_fetch_pos (lc_mc_search->regex_match_info, 0, &start_pos, &end_pos);
#else /* SEARCH_TYPE_GLIB */
start_pos = lc_mc_search->iovector[0];
end_pos = lc_mc_search->iovector[1];
#endif /* SEARCH_TYPE_GLIB */
if (found_len != NULL)
*found_len = end_pos - start_pos;
lc_mc_search->normal_offset = lc_mc_search->start_buffer + start_pos;
return TRUE;
case COND__NOT_ALL_FOUND:
break;
default:
g_string_free (lc_mc_search->regex_buffer, TRUE);
lc_mc_search->regex_buffer = NULL;
return FALSE;
}
if ((lc_mc_search->update_fn != NULL) &&
((lc_mc_search->update_fn) (user_data, current_pos) == MC_SEARCH_CB_ABORT))
ret = MC_SEARCH_CB_ABORT;
if (ret == MC_SEARCH_CB_ABORT || ret == MC_SEARCH_CB_NOTFOUND)
break;
}
g_string_free (lc_mc_search->regex_buffer, TRUE);
lc_mc_search->regex_buffer = NULL;
MC_PTR_FREE (lc_mc_search->error_str);
lc_mc_search->error = ret == MC_SEARCH_CB_ABORT ? MC_SEARCH_E_ABORT : MC_SEARCH_E_NOTFOUND;
return FALSE;
}
/* --------------------------------------------------------------------------------------------- */
GString *
mc_search_regex_prepare_replace_str (mc_search_t * lc_mc_search, GString * replace_str)
{
GString *ret;
int num_replace_tokens;
gsize loop;
gsize prev = 0;
replace_transform_type_t replace_flags = REPLACE_T_NO_TRANSFORM;
num_replace_tokens =
mc_search_regex__get_max_num_of_replace_tokens (replace_str->str, replace_str->len);
if (lc_mc_search->num_results < 0)
return g_string_new_len (replace_str->str, replace_str->len);
if (num_replace_tokens > lc_mc_search->num_results - 1
|| num_replace_tokens > MC_SEARCH__NUM_REPLACE_ARGS)
{
mc_search_set_error (lc_mc_search, MC_SEARCH_E_REGEX_REPLACE, "%s",
_(STR_E_RPL_NOT_EQ_TO_FOUND));
return NULL;
}
ret = g_string_sized_new (64);
for (loop = 0; loop < replace_str->len - 1; loop++)
{
int lc_index;
gchar *tmp_str;
gsize len = 0;
lc_index = mc_search_regex__process_replace_str (replace_str, loop, &len, &replace_flags);
if (lc_index == REPLACE_PREPARE_T_NOTHING_SPECIAL)
{
if (len != 0)
{
mc_search_regex__process_append_str (ret, replace_str->str + prev, loop - prev,
&replace_flags);
mc_search_regex__process_append_str (ret, replace_str->str + loop + 1, len - 1,
&replace_flags);
prev = loop + len;
loop = prev - 1; /* prepare to loop++ */
}
continue;
}
if (lc_index == REPLACE_PREPARE_T_REPLACE_FLAG)
{
if (loop != 0)
mc_search_regex__process_append_str (ret, replace_str->str + prev, loop - prev,
&replace_flags);
prev = loop + len;
loop = prev - 1; /* prepare to loop++ */
continue;
}
/* escape sequence */
if (lc_index == REPLACE_PREPARE_T_ESCAPE_SEQ)
{
mc_search_regex__process_append_str (ret, replace_str->str + prev, loop - prev,
&replace_flags);
/* call process_escape_sequence without starting '\\' */
mc_search_regex__process_escape_sequence (ret, replace_str->str + loop + 1, len - 1,
&replace_flags, lc_mc_search->is_utf8);
prev = loop + len;
loop = prev - 1; /* prepare to loop++ */
continue;
}
/* invalid capture buffer number */
if (lc_index > lc_mc_search->num_results)
{
g_string_free (ret, TRUE);
mc_search_set_error (lc_mc_search, MC_SEARCH_E_REGEX_REPLACE,
_(STR_E_RPL_INVALID_TOKEN), lc_index);
return NULL;
}
tmp_str = mc_search_regex__get_token_by_num (lc_mc_search, lc_index);
if (loop != 0)
mc_search_regex__process_append_str (ret, replace_str->str + prev, loop - prev,
&replace_flags);
mc_search_regex__process_append_str (ret, tmp_str, -1, &replace_flags);
g_free (tmp_str);
prev = loop + len;
loop = prev - 1; /* prepare to loop++ */
}
mc_search_regex__process_append_str (ret, replace_str->str + prev, replace_str->len - prev,
&replace_flags);
return ret;
}
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