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mc/lib/search/search.c
Slava Zanko 045debaa8a Moved charsets.[ch] from src to lib directory 
Signed-off-by: Slava Zanko <slavazanko@gmail.com>
2010-11-24 10:51:31 +03:00

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/*
Search text engine.
Interface functions
Copyright (C) 2009 The Free Software Foundation, Inc.
Written by:
Slava Zanko <slavazanko@gmail.com>, 2009.
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 2 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
*/
#include <config.h>
#include <stdlib.h>
#include <sys/types.h>
#include "lib/global.h"
#include "lib/strutil.h"
#include "lib/search.h"
#include "lib/charsets.h"
#include "internal.h"
/*** global variables ****************************************************************************/
/*** file scope macro definitions ****************************************************************/
/*** file scope type declarations ****************************************************************/
/*** file scope variables ************************************************************************/
static const mc_search_type_str_t mc_search__list_types[] = {
{N_("Normal"), MC_SEARCH_T_NORMAL},
{N_("&Regular expression"), MC_SEARCH_T_REGEX},
{N_("Hexadecimal"), MC_SEARCH_T_HEX},
{N_("Wildcard search"), MC_SEARCH_T_GLOB},
{NULL, -1}
};
/*** file scope functions ************************************************************************/
static mc_search_cond_t *
mc_search__cond_struct_new (mc_search_t * lc_mc_search, const char *str,
gsize str_len, const char *charset)
{
mc_search_cond_t *mc_search_cond;
mc_search_cond = g_malloc0 (sizeof (mc_search_cond_t));
mc_search_cond->str = g_string_new_len (str, str_len);
mc_search_cond->charset = g_strdup (charset);
switch (lc_mc_search->search_type)
{
case MC_SEARCH_T_GLOB:
mc_search__cond_struct_new_init_glob (charset, lc_mc_search, mc_search_cond);
break;
case MC_SEARCH_T_NORMAL:
mc_search__cond_struct_new_init_normal (charset, lc_mc_search, mc_search_cond);
break;
case MC_SEARCH_T_REGEX:
mc_search__cond_struct_new_init_regex (charset, lc_mc_search, mc_search_cond);
break;
case MC_SEARCH_T_HEX:
mc_search__cond_struct_new_init_hex (charset, lc_mc_search, mc_search_cond);
break;
default:
break;
}
return mc_search_cond;
}
/* --------------------------------------------------------------------------------------------- */
static void
mc_search__cond_struct_free (mc_search_cond_t * mc_search_cond)
{
if (mc_search_cond->upper)
g_string_free (mc_search_cond->upper, TRUE);
if (mc_search_cond->lower)
g_string_free (mc_search_cond->lower, TRUE);
g_string_free (mc_search_cond->str, TRUE);
g_free (mc_search_cond->charset);
#ifdef SEARCH_TYPE_GLIB
if (mc_search_cond->regex_handle)
g_regex_unref (mc_search_cond->regex_handle);
#else /* SEARCH_TYPE_GLIB */
g_free (mc_search_cond->regex_handle);
#endif /* SEARCH_TYPE_GLIB */
g_free (mc_search_cond);
}
/* --------------------------------------------------------------------------------------------- */
static void
mc_search__conditions_free (GPtrArray * array)
{
gsize loop1;
mc_search_cond_t *lc_mc_search;
for (loop1 = 0; loop1 < array->len; loop1++)
{
lc_mc_search = (mc_search_cond_t *) g_ptr_array_index (array, loop1);
mc_search__cond_struct_free (lc_mc_search);
}
g_ptr_array_free (array, TRUE);
}
/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
mc_search_t *
mc_search_new (const gchar * original, gsize str_len)
{
mc_search_t *lc_mc_search;
if (!original)
return NULL;
if ((gssize) str_len == -1)
{
str_len = strlen (original);
if (str_len == 0)
return NULL;
}
lc_mc_search = g_malloc0 (sizeof (mc_search_t));
lc_mc_search->original = g_strndup (original, str_len);
lc_mc_search->original_len = str_len;
return lc_mc_search;
}
/* --------------------------------------------------------------------------------------------- */
void
mc_search_free (mc_search_t * lc_mc_search)
{
if (lc_mc_search == NULL)
return;
g_free (lc_mc_search->original);
g_free (lc_mc_search->error_str);
if (lc_mc_search->conditions)
mc_search__conditions_free (lc_mc_search->conditions);
#ifdef SEARCH_TYPE_GLIB
if (lc_mc_search->regex_match_info)
g_match_info_free (lc_mc_search->regex_match_info);
#else /* SEARCH_TYPE_GLIB */
g_free (lc_mc_search->regex_match_info);
#endif /* SEARCH_TYPE_GLIB */
if (lc_mc_search->regex_buffer != NULL)
g_string_free (lc_mc_search->regex_buffer, TRUE);
g_free (lc_mc_search);
}
/* --------------------------------------------------------------------------------------------- */
gboolean
mc_search_prepare (mc_search_t * lc_mc_search)
{
GPtrArray *ret;
ret = g_ptr_array_new ();
#ifdef HAVE_CHARSET
if (lc_mc_search->is_all_charsets)
{
gsize loop1, recoded_str_len;
gchar *buffer;
for (loop1 = 0; loop1 < codepages->len; loop1++)
{
const char *id = ((codepage_desc *) g_ptr_array_index (codepages, loop1))->id;
if (!g_ascii_strcasecmp (id, cp_source))
{
g_ptr_array_add (ret,
mc_search__cond_struct_new (lc_mc_search, lc_mc_search->original,
lc_mc_search->original_len,
cp_source));
continue;
}
buffer =
mc_search__recode_str (lc_mc_search->original, lc_mc_search->original_len,
cp_source, id, &recoded_str_len);
g_ptr_array_add (ret,
mc_search__cond_struct_new (lc_mc_search, buffer,
recoded_str_len, id));
g_free (buffer);
}
}
else
{
g_ptr_array_add (ret,
(gpointer) mc_search__cond_struct_new (lc_mc_search,
lc_mc_search->original,
lc_mc_search->original_len,
cp_source));
}
#else
g_ptr_array_add (ret,
(gpointer) mc_search__cond_struct_new (lc_mc_search, lc_mc_search->original,
lc_mc_search->original_len,
str_detect_termencoding ()));
#endif
lc_mc_search->conditions = ret;
return (lc_mc_search->error == MC_SEARCH_E_OK);
}
/* --------------------------------------------------------------------------------------------- */
gboolean
mc_search_run (mc_search_t * lc_mc_search, const void *user_data,
gsize start_search, gsize end_search, gsize * found_len)
{
gboolean ret = FALSE;
if (!lc_mc_search)
return FALSE;
if (!mc_search_is_type_avail (lc_mc_search->search_type))
{
lc_mc_search->error = MC_SEARCH_E_INPUT;
lc_mc_search->error_str = g_strdup (_(STR_E_UNKNOWN_TYPE));
return FALSE;
}
#ifdef SEARCH_TYPE_GLIB
if (lc_mc_search->regex_match_info)
{
g_match_info_free (lc_mc_search->regex_match_info);
lc_mc_search->regex_match_info = NULL;
}
#endif /* SEARCH_TYPE_GLIB */
lc_mc_search->error = MC_SEARCH_E_OK;
g_free (lc_mc_search->error_str);
lc_mc_search->error_str = NULL;
if ((lc_mc_search->conditions == NULL) && !mc_search_prepare (lc_mc_search))
return FALSE;
switch (lc_mc_search->search_type)
{
case MC_SEARCH_T_NORMAL:
ret = mc_search__run_normal (lc_mc_search, user_data, start_search, end_search, found_len);
break;
case MC_SEARCH_T_REGEX:
ret = mc_search__run_regex (lc_mc_search, user_data, start_search, end_search, found_len);
break;
case MC_SEARCH_T_GLOB:
ret = mc_search__run_glob (lc_mc_search, user_data, start_search, end_search, found_len);
break;
case MC_SEARCH_T_HEX:
ret = mc_search__run_hex (lc_mc_search, user_data, start_search, end_search, found_len);
break;
default:
break;
}
return ret;
}
/* --------------------------------------------------------------------------------------------- */
gboolean
mc_search_is_type_avail (mc_search_type_t search_type)
{
switch (search_type)
{
case MC_SEARCH_T_GLOB:
case MC_SEARCH_T_NORMAL:
case MC_SEARCH_T_REGEX:
case MC_SEARCH_T_HEX:
return TRUE;
default:
break;
}
return FALSE;
}
/* --------------------------------------------------------------------------------------------- */
const mc_search_type_str_t *
mc_search_types_list_get (size_t * num)
{
/* don't count last NULL item */
if (num != NULL)
*num = sizeof (mc_search__list_types) / sizeof (mc_search__list_types[0]) - 1;
return mc_search__list_types;
}
/* --------------------------------------------------------------------------------------------- */
GString *
mc_search_prepare_replace_str (mc_search_t * lc_mc_search, GString * replace_str)
{
GString *ret;
if (lc_mc_search == NULL)
return g_string_new_len (replace_str->str, replace_str->len);
if (replace_str == NULL || replace_str->str == NULL || replace_str->len == 0)
return g_string_new ("");
switch (lc_mc_search->search_type)
{
case MC_SEARCH_T_REGEX:
ret = mc_search_regex_prepare_replace_str (lc_mc_search, replace_str);
break;
case MC_SEARCH_T_GLOB:
ret = mc_search_glob_prepare_replace_str (lc_mc_search, replace_str);
break;
case MC_SEARCH_T_NORMAL:
ret = mc_search_normal_prepare_replace_str (lc_mc_search, replace_str);
break;
case MC_SEARCH_T_HEX:
ret = mc_search_hex_prepare_replace_str (lc_mc_search, replace_str);
break;
default:
ret = g_string_new_len (replace_str->str, replace_str->len);
break;
}
return ret;
}
/* --------------------------------------------------------------------------------------------- */
char *
mc_search_prepare_replace_str2 (mc_search_t * lc_mc_search, char *replace_str)
{
GString *ret;
GString *replace_str2;
replace_str2 = g_string_new (replace_str);
ret = mc_search_prepare_replace_str (lc_mc_search, replace_str2);
g_string_free (replace_str2, TRUE);
return (ret != NULL) ? g_string_free (ret, FALSE) : NULL;
}
/* --------------------------------------------------------------------------------------------- */
gboolean
mc_search_is_fixed_search_str (mc_search_t * lc_mc_search)
{
if (lc_mc_search == NULL)
return FALSE;
switch (lc_mc_search->search_type)
{
case MC_SEARCH_T_REGEX:
case MC_SEARCH_T_GLOB:
return FALSE;
default:
return TRUE;
}
}
/* --------------------------------------------------------------------------------------------- */
gboolean
mc_search (const gchar * pattern, const gchar * str, mc_search_type_t type)
{
gboolean ret;
mc_search_t *search = mc_search_new (pattern, -1);
if (search == NULL)
return FALSE;
search->search_type = type;
search->is_case_sensitive = TRUE;
if (type == MC_SEARCH_T_GLOB)
search->is_entire_line = TRUE;
ret = mc_search_run (search, str, 0, strlen (str), NULL);
mc_search_free (search);
return ret;
}
/* --------------------------------------------------------------------------------------------- */
int
mc_search_getstart_result_by_num (mc_search_t * lc_mc_search, int lc_index)
{
if (!lc_mc_search)
return 0;
if (lc_mc_search->search_type == MC_SEARCH_T_NORMAL)
return 0;
#ifdef SEARCH_TYPE_GLIB
{
gint start_pos;
gint end_pos;
g_match_info_fetch_pos (lc_mc_search->regex_match_info, lc_index, &start_pos, &end_pos);
return (int) start_pos;
}
#else /* SEARCH_TYPE_GLIB */
return lc_mc_search->iovector[lc_index * 2];
#endif /* SEARCH_TYPE_GLIB */
}
/* --------------------------------------------------------------------------------------------- */
int
mc_search_getend_result_by_num (mc_search_t * lc_mc_search, int lc_index)
{
if (!lc_mc_search)
return 0;
if (lc_mc_search->search_type == MC_SEARCH_T_NORMAL)
return 0;
#ifdef SEARCH_TYPE_GLIB
{
gint start_pos;
gint end_pos;
g_match_info_fetch_pos (lc_mc_search->regex_match_info, lc_index, &start_pos, &end_pos);
return (int) end_pos;
}
#else /* SEARCH_TYPE_GLIB */
return lc_mc_search->iovector[lc_index * 2 + 1];
#endif /* SEARCH_TYPE_GLIB */
}
/* --------------------------------------------------------------------------------------------- */
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