lib/search/regex.c

   1 /*
   2    Search text engine.
   3    Regex search
   4
   5    Copyright (C) 2009 The Free Software Foundation, Inc.
   6
   7    Written by:
   8    Slava Zanko <slavazanko@gmail.com>, 2009.
   9
  10    This file is part of the Midnight Commander.
  11
  12    The Midnight Commander is free software; you can redistribute it
  13    and/or modify it under the terms of the GNU General Public License as
  14    published by the Free Software Foundation; either version 2 of the
  15    License, or (at your option) any later version.
  16
  17    The Midnight Commander is distributed in the hope that it will be
  18    useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  19    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20    General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  25    MA 02110-1301, USA.
  26  */
  27
  28 #include <config.h>
  29
  30 #include <stdlib.h>
  31
  32 #include "lib/global.h"
  33 #include "lib/strutil.h"
  34 #include "lib/search.h"
  35 #include "lib/strescape.h"
  36
  37 #include "src/charsets.h"
  38
  39 #include "internal.h"
  40
  41 /*** global variables ****************************************************************************/
  42
  43 /*** file scope macro definitions ****************************************************************/
  44
  45 /*** file scope type declarations ****************************************************************/
  46
  47 typedef enum
  48 {
  49     REPLACE_T_NO_TRANSFORM = 0,
  50     REPLACE_T_UPP_TRANSFORM_CHAR = 1,
  51     REPLACE_T_LOW_TRANSFORM_CHAR = 2,
  52     REPLACE_T_UPP_TRANSFORM = 4,
  53     REPLACE_T_LOW_TRANSFORM = 8
  54 } replace_transform_type_t;
  55
  56 /*** file scope variables ************************************************************************/
  57
  58 /*** file scope functions ************************************************************************/
  59
  60 static gboolean
  61 mc_search__regex_str_append_if_special (GString * copy_to, const GString * regex_str, gsize * offset)
  62 {
  63     char *tmp_regex_str;
  64     gsize spec_chr_len;
  65     const char **spec_chr;
  66     const char *special_chars[] = {
  67         "\\s", "\\S",
  68         "\\d", "\\D",
  69         "\\b", "\\B",
  70         "\\w", "\\W",
  71         "\\t", "\\n",
  72         "\\r", "\\f",
  73         "\\a", "\\e",
  74         "\\x", "\\X",
  75         "\\c", "\\C",
  76         "\\l", "\\L",
  77         "\\u", "\\U",
  78         "\\E", "\\Q",
  79         NULL
  80     };
  81     spec_chr = special_chars;
  82
  83     tmp_regex_str = &(regex_str->str[*offset]);
  84
  85     while (*spec_chr)
  86     {
  87         spec_chr_len = strlen (*spec_chr);
  88         if (!strncmp (tmp_regex_str, *spec_chr, spec_chr_len))
  89         {
  90             if (!strutils_is_char_escaped (regex_str->str, tmp_regex_str))
  91             {
  92                 if (!strncmp ("\\x", *spec_chr, spec_chr_len))
  93                 {
  94                     if (*(tmp_regex_str + spec_chr_len) == '{')
  95                     {
  96                         while ((spec_chr_len < regex_str->len - *offset)
  97                                && *(tmp_regex_str + spec_chr_len) != '}')
  98                             spec_chr_len++;
  99                         if (*(tmp_regex_str + spec_chr_len) == '}')
 100                             spec_chr_len++;
 101                     }
 102                     else
 103                         spec_chr_len += 2;
 104                 }
 105                 g_string_append_len (copy_to, tmp_regex_str, spec_chr_len);
 106                 *offset += spec_chr_len;
 107                 return TRUE;
 108             }
 109         }
 110         spec_chr++;
 111     }
 112     return FALSE;
 113
 114 }
 115
 116 /* --------------------------------------------------------------------------------------------- */
 117 static void
 118 mc_search__cond_struct_new_regex_hex_add (const char *charset, GString * str_to,
 119                                           const char *one_char, gsize str_len)
 120 {
 121     GString *upp, *low;
 122     gchar *tmp_str;
 123     gsize loop;
 124
 125     upp = mc_search__toupper_case_str (charset, one_char, str_len);
 126     low = mc_search__tolower_case_str (charset, one_char, str_len);
 127
 128     for (loop = 0; loop < upp->len; loop++)
 129     {
 130
 131         if (loop < low->len)
 132         {
 133             if (upp->str[loop] == low->str[loop])
 134                 tmp_str = g_strdup_printf ("\\x%02X", (unsigned char) upp->str[loop]);
 135             else
 136                 tmp_str =
 137                     g_strdup_printf ("[\\x%02X\\x%02X]", (unsigned char) upp->str[loop],
 138                                      (unsigned char) low->str[loop]);
 139         }
 140         else
 141         {
 142             tmp_str = g_strdup_printf ("\\x%02X", (unsigned char) upp->str[loop]);
 143         }
 144         g_string_append (str_to, tmp_str);
 145         g_free (tmp_str);
 146     }
 147     g_string_free (upp, TRUE);
 148     g_string_free (low, TRUE);
 149 }
 150
 151 /* --------------------------------------------------------------------------------------------- */
 152
 153 static void
 154 mc_search__cond_struct_new_regex_accum_append (const char *charset, GString * str_to,
 155                                                GString * str_from)
 156 {
 157     GString *recoded_part;
 158     gsize loop = 0;
 159
 160     recoded_part = g_string_sized_new (32);
 161
 162     while (loop < str_from->len)
 163     {
 164         gchar *one_char;
 165         gsize one_char_len;
 166         gboolean just_letters;
 167
 168         one_char =
 169             mc_search__get_one_symbol (charset, &(str_from->str[loop]),
 170                                        min (str_from->len - loop, 6), &just_letters);
 171         one_char_len = strlen (one_char);
 172
 173         if (one_char_len == 0)
 174             loop++;
 175         else
 176         {
 177             loop += one_char_len;
 178
 179             if (just_letters)
 180                 mc_search__cond_struct_new_regex_hex_add (charset, recoded_part, one_char,
 181                                                           one_char_len);
 182             else
 183                 g_string_append_len (recoded_part, one_char, one_char_len);
 184         }
 185
 186         g_free (one_char);
 187     }
 188
 189     g_string_append (str_to, recoded_part->str);
 190     g_string_free (recoded_part, TRUE);
 191     g_string_set_size (str_from, 0);
 192 }
 193
 194 /* --------------------------------------------------------------------------------------------- */
 195
 196 static GString *
 197 mc_search__cond_struct_new_regex_ci_str (const char *charset, const GString *astr)
 198 {
 199     const char *str = astr->str;
 200     GString *accumulator, *spec_char, *ret_str;
 201     gsize loop;
 202     GString *tmp;
 203     tmp = g_string_new_len (str, astr->len);
 204
 205
 206     ret_str = g_string_new ("");
 207     accumulator = g_string_new ("");
 208     spec_char = g_string_new ("");
 209     loop = 0;
 210
 211     while (loop <= astr->len)
 212     {
 213         if (mc_search__regex_str_append_if_special (spec_char, tmp, &loop))
 214         {
 215             mc_search__cond_struct_new_regex_accum_append (charset, ret_str, accumulator);
 216             g_string_append_len (ret_str, spec_char->str, spec_char->len);
 217             g_string_set_size (spec_char, 0);
 218             continue;
 219         }
 220
 221         if (tmp->str[loop] == '[' && !strutils_is_char_escaped (tmp->str, &(tmp->str[loop])))
 222         {
 223             mc_search__cond_struct_new_regex_accum_append (charset, ret_str, accumulator);
 224
 225             while (loop < astr->len && !(tmp->str[loop] == ']'
 226                                        && !strutils_is_char_escaped (tmp->str, &(tmp->str[loop]))))
 227             {
 228                 g_string_append_c (ret_str, tmp->str[loop]);
 229                 loop++;
 230             }
 231
 232             g_string_append_c (ret_str, tmp->str[loop]);
 233             loop++;
 234             continue;
 235         }
 236         /*
 237            TODO: handle [ and ]
 238          */
 239         g_string_append_c (accumulator, tmp->str[loop]);
 240         loop++;
 241     }
 242     mc_search__cond_struct_new_regex_accum_append (charset, ret_str, accumulator);
 243
 244     g_string_free (accumulator, TRUE);
 245     g_string_free (spec_char, TRUE);
 246     g_string_free (tmp, TRUE);
 247     return ret_str;
 248 }
 249
 250 /* --------------------------------------------------------------------------------------------- */
 251
 252 static mc_search__found_cond_t
 253 mc_search__regex_found_cond_one (mc_search_t * lc_mc_search, mc_search_regex_t * regex,
 254                                  GString * search_str)
 255 {
 256 #ifdef SEARCH_TYPE_GLIB
 257     GError *error = NULL;
 258
 259     if (!g_regex_match_full
 260         (regex, search_str->str, -1, 0, G_REGEX_MATCH_NEWLINE_ANY, &lc_mc_search->regex_match_info,
 261          &error))
 262     {
 263         g_match_info_free (lc_mc_search->regex_match_info);
 264         lc_mc_search->regex_match_info = NULL;
 265         if (error)
 266         {
 267             lc_mc_search->error = MC_SEARCH_E_REGEX;
 268             lc_mc_search->error_str =
 269                 str_conv_gerror_message (error, _("Regular expression error"));
 270             g_error_free (error);
 271             return COND__FOUND_ERROR;
 272         }
 273         return COND__NOT_FOUND;
 274     }
 275     lc_mc_search->num_results = g_match_info_get_match_count (lc_mc_search->regex_match_info);
 276 #else /* SEARCH_TYPE_GLIB */
 277     lc_mc_search->num_results = pcre_exec (regex, lc_mc_search->regex_match_info,
 278                                            search_str->str, search_str->len - 1, 0, 0,
 279                                            lc_mc_search->iovector, MC_SEARCH__NUM_REPLACE_ARGS);
 280     if (lc_mc_search->num_results < 0)
 281     {
 282         return COND__NOT_FOUND;
 283     }
 284 #endif /* SEARCH_TYPE_GLIB */
 285     return COND__FOUND_OK;
 286
 287 }
 288
 289 /* --------------------------------------------------------------------------------------------- */
 290
 291 static mc_search__found_cond_t
 292 mc_search__regex_found_cond (mc_search_t * lc_mc_search, GString * search_str)
 293 {
 294     gsize loop1;
 295     mc_search_cond_t *mc_search_cond;
 296     mc_search__found_cond_t ret;
 297
 298     for (loop1 = 0; loop1 < lc_mc_search->conditions->len; loop1++)
 299     {
 300         mc_search_cond = (mc_search_cond_t *) g_ptr_array_index (lc_mc_search->conditions, loop1);
 301
 302         if (!mc_search_cond->regex_handle)
 303             continue;
 304
 305         ret =
 306             mc_search__regex_found_cond_one (lc_mc_search, mc_search_cond->regex_handle,
 307                                              search_str);
 308
 309         if (ret != COND__NOT_FOUND)
 310             return ret;
 311     }
 312     return COND__NOT_ALL_FOUND;
 313 }
 314
 315 /* --------------------------------------------------------------------------------------------- */
 316
 317 static int
 318 mc_search_regex__get_max_num_of_replace_tokens (const gchar * str, gsize len)
 319 {
 320     int max_token = 0;
 321     gsize loop;
 322     for (loop = 0; loop < len - 1; loop++)
 323     {
 324         if (str[loop] == '\\' && g_ascii_isdigit(str[loop + 1]) )
 325         {
 326             if (strutils_is_char_escaped (str, &str[loop]))
 327                 continue;
 328             if (max_token < str[loop + 1] - '0')
 329                 max_token = str[loop + 1] - '0';
 330             continue;
 331         }
 332         if (str[loop] == '$' && str[loop + 1] == '{')
 333         {
 334             gsize tmp_len;
 335             char *tmp_str;
 336             int tmp_token;
 337             if (strutils_is_char_escaped (str, &str[loop]))
 338                 continue;
 339
 340             for (tmp_len = 0;
 341                  loop + tmp_len + 2 < len && (str[loop + 2 + tmp_len] & (char) 0xf0) == 0x30;
 342                  tmp_len++);
 343             if (str[loop + 2 + tmp_len] == '}')
 344             {
 345                 tmp_str = g_strndup (&str[loop + 2], tmp_len);
 346                 tmp_token = atoi (tmp_str);
 347                 if (max_token < tmp_token)
 348                     max_token = tmp_token;
 349                 g_free (tmp_str);
 350             }
 351         }
 352     }
 353     return max_token;
 354 }
 355
 356 /* --------------------------------------------------------------------------------------------- */
 357
 358 static char *
 359 mc_search_regex__get_token_by_num (const mc_search_t * lc_mc_search, gsize lc_index)
 360 {
 361     int fnd_start = 0, fnd_end = 0;
 362
 363 #ifdef SEARCH_TYPE_GLIB
 364     g_match_info_fetch_pos (lc_mc_search->regex_match_info, lc_index, &fnd_start, &fnd_end);
 365 #else /* SEARCH_TYPE_GLIB */
 366     fnd_start = lc_mc_search->iovector[lc_index * 2 + 0];
 367     fnd_end = lc_mc_search->iovector[lc_index * 2 + 1];
 368 #endif /* SEARCH_TYPE_GLIB */
 369
 370     if (fnd_end - fnd_start == 0)
 371         return NULL;
 372
 373     return g_strndup (lc_mc_search->regex_buffer->str + fnd_start, fnd_end - fnd_start);
 374
 375 }
 376
 377 /* --------------------------------------------------------------------------------------------- */
 378 static int
 379 mc_search_regex__process_replace_str (const GString * replace_str, const gsize current_pos,
 380                                       gsize * skip_len, replace_transform_type_t * replace_flags)
 381 {
 382     int ret = -1;
 383     char *tmp_str;
 384     const char *curr_str = &(replace_str->str[current_pos]);
 385
 386     if (current_pos > replace_str->len)
 387         return -1;
 388
 389     *skip_len = 0;
 390
 391     if (*curr_str == '$' && *(curr_str + 1) == '{' && (*(curr_str + 2) & (char) 0xf0) == 0x30)
 392     {
 393         if (strutils_is_char_escaped (replace_str->str, curr_str))
 394         {
 395             *skip_len = 1;
 396             return -1;
 397         }
 398
 399         for (*skip_len = 0;
 400              current_pos + *skip_len + 2 < replace_str->len
 401              && (*(curr_str + 2 + *skip_len) & (char) 0xf0) == 0x30; (*skip_len)++);
 402
 403         if (*(curr_str + 2 + *skip_len) != '}')
 404             return -1;
 405
 406         tmp_str = g_strndup (curr_str + 2, *skip_len);
 407         if (tmp_str == NULL)
 408             return -1;
 409
 410         ret = atoi (tmp_str);
 411         g_free (tmp_str);
 412
 413         *skip_len += 3;         /* ${} */
 414         return ret;
 415     }
 416
 417     if (*curr_str == '\\')
 418     {
 419         if (strutils_is_char_escaped (replace_str->str, curr_str))
 420         {
 421             *skip_len = 1;
 422             return -1;
 423         }
 424
 425         if ( g_ascii_isdigit(*(curr_str + 1)))
 426         {
 427             ret = g_ascii_digit_value (*(curr_str + 1));
 428             *skip_len = 2;      /* \\ and one digit */
 429             return ret;
 430         }
 431         ret = -2;
 432         *skip_len += 2;
 433         switch (*(curr_str + 1))
 434         {
 435         case 'U':
 436             *replace_flags |= REPLACE_T_UPP_TRANSFORM;
 437             *replace_flags &= ~REPLACE_T_LOW_TRANSFORM;
 438             break;
 439         case 'u':
 440             *replace_flags |= REPLACE_T_UPP_TRANSFORM_CHAR;
 441             break;
 442         case 'L':
 443             *replace_flags |= REPLACE_T_LOW_TRANSFORM;
 444             *replace_flags &= ~REPLACE_T_UPP_TRANSFORM;
 445             break;
 446         case 'l':
 447             *replace_flags |= REPLACE_T_LOW_TRANSFORM_CHAR;
 448             break;
 449         case 'E':
 450             *replace_flags = REPLACE_T_NO_TRANSFORM;
 451             break;
 452         default:
 453             ret = -1;
 454             break;
 455         }
 456     }
 457     return ret;
 458 }
 459 static void
 460 mc_search_regex__process_append_str (GString * dest_str, const char *from, gsize len,
 461                                      replace_transform_type_t * replace_flags)
 462 {
 463     gsize loop = 0;
 464     gsize char_len;
 465     char *tmp_str;
 466     GString *tmp_string;
 467
 468     if (len == (gsize) - 1)
 469         len = strlen (from);
 470
 471     if (*replace_flags == REPLACE_T_NO_TRANSFORM)
 472     {
 473         g_string_append_len (dest_str, from, len);
 474         return;
 475     }
 476     while (loop < len)
 477     {
 478         tmp_str = mc_search__get_one_symbol (NULL, from + loop, len - loop, NULL);
 479         char_len = strlen (tmp_str);
 480         if (*replace_flags & REPLACE_T_UPP_TRANSFORM_CHAR)
 481         {
 482             *replace_flags &= ~REPLACE_T_UPP_TRANSFORM_CHAR;
 483             tmp_string = mc_search__toupper_case_str (NULL, tmp_str, char_len);
 484             g_string_append (dest_str, tmp_string->str);
 485             g_string_free (tmp_string, TRUE);
 486
 487         }
 488         else if (*replace_flags & REPLACE_T_LOW_TRANSFORM_CHAR)
 489         {
 490             *replace_flags &= ~REPLACE_T_LOW_TRANSFORM_CHAR;
 491             tmp_string = mc_search__toupper_case_str (NULL, tmp_str, char_len);
 492             g_string_append (dest_str, tmp_string->str);
 493             g_string_free (tmp_string, TRUE);
 494
 495         }
 496         else if (*replace_flags & REPLACE_T_UPP_TRANSFORM)
 497         {
 498             tmp_string = mc_search__toupper_case_str (NULL, tmp_str, char_len);
 499             g_string_append (dest_str, tmp_string->str);
 500             g_string_free (tmp_string, TRUE);
 501
 502         }
 503         else if (*replace_flags & REPLACE_T_LOW_TRANSFORM)
 504         {
 505             tmp_string = mc_search__tolower_case_str (NULL, tmp_str, char_len);
 506             g_string_append (dest_str, tmp_string->str);
 507             g_string_free (tmp_string, TRUE);
 508
 509         }
 510         else
 511         {
 512             g_string_append (dest_str, tmp_str);
 513         }
 514         g_free (tmp_str);
 515         loop += char_len;
 516     }
 517
 518 }
 519
 520 /*** public functions ****************************************************************************/
 521
 522 void
 523 mc_search__cond_struct_new_init_regex (const char *charset, mc_search_t * lc_mc_search,
 524                                        mc_search_cond_t * mc_search_cond)
 525 {
 526 #ifdef SEARCH_TYPE_GLIB
 527     GError *error = NULL;
 528 #else /* SEARCH_TYPE_GLIB */
 529     const char *error;
 530     int erroffset;
 531 #endif /* SEARCH_TYPE_GLIB */
 532
 533     if (!lc_mc_search->is_case_sensitive)
 534     {
 535         GString *tmp;
 536
 537         tmp = mc_search_cond->str;
 538         mc_search_cond->str = mc_search__cond_struct_new_regex_ci_str (charset, tmp);
 539         g_string_free (tmp, TRUE);
 540     }
 541 #ifdef SEARCH_TYPE_GLIB
 542     mc_search_cond->regex_handle =
 543         g_regex_new (mc_search_cond->str->str, G_REGEX_OPTIMIZE | G_REGEX_RAW | G_REGEX_DOTALL, 0,
 544                      &error);
 545
 546     if (error != NULL)
 547     {
 548         lc_mc_search->error = MC_SEARCH_E_REGEX_COMPILE;
 549         lc_mc_search->error_str = str_conv_gerror_message (error, _("Regular expression error"));
 550         g_error_free (error);
 551         return;
 552     }
 553 #else /* SEARCH_TYPE_GLIB */
 554     mc_search_cond->regex_handle =
 555         pcre_compile (mc_search_cond->str->str, PCRE_EXTRA, &error, &erroffset, NULL);
 556     if (mc_search_cond->regex_handle == NULL)
 557     {
 558         lc_mc_search->error = MC_SEARCH_E_REGEX_COMPILE;
 559         lc_mc_search->error_str = g_strdup (error);
 560         return;
 561     }
 562     lc_mc_search->regex_match_info = pcre_study (mc_search_cond->regex_handle, 0, &error);
 563     if (lc_mc_search->regex_match_info == NULL)
 564     {
 565         if (error)
 566         {
 567             lc_mc_search->error = MC_SEARCH_E_REGEX_COMPILE;
 568             lc_mc_search->error_str = g_strdup (error);
 569             g_free (mc_search_cond->regex_handle);
 570             mc_search_cond->regex_handle = NULL;
 571             return;
 572         }
 573     }
 574 #endif /* SEARCH_TYPE_GLIB */
 575 }
 576
 577 /* --------------------------------------------------------------------------------------------- */
 578
 579 gboolean
 580 mc_search__run_regex (mc_search_t * lc_mc_search, const void *user_data,
 581                       gsize start_search, gsize end_search, gsize * found_len)
 582 {
 583     gsize current_pos, virtual_pos;
 584     int current_chr = 0;
 585     gint start_pos;
 586     gint end_pos;
 587
 588     if (lc_mc_search->regex_buffer != NULL)
 589         g_string_free (lc_mc_search->regex_buffer, TRUE);
 590
 591     lc_mc_search->regex_buffer = g_string_new ("");
 592
 593     virtual_pos = current_pos = start_search;
 594     while (virtual_pos <= end_search)
 595     {
 596         g_string_set_size (lc_mc_search->regex_buffer, 0);
 597         lc_mc_search->start_buffer = current_pos;
 598
 599         while (1)
 600         {
 601             current_chr = mc_search__get_char (lc_mc_search, user_data, current_pos);
 602             if (current_chr == MC_SEARCH_CB_ABORT)
 603                 break;
 604
 605             current_pos++;
 606
 607             if (current_chr == MC_SEARCH_CB_SKIP)
 608                 continue;
 609
 610             virtual_pos++;
 611
 612             g_string_append_c (lc_mc_search->regex_buffer, (char) current_chr);
 613
 614
 615             if (current_chr == 0 || (char) current_chr == '\n')
 616                 break;
 617
 618             if (virtual_pos > end_search)
 619                 break;
 620
 621         }
 622         switch (mc_search__regex_found_cond (lc_mc_search, lc_mc_search->regex_buffer))
 623         {
 624         case COND__FOUND_OK:
 625 #ifdef SEARCH_TYPE_GLIB
 626             if (lc_mc_search->whole_words)
 627             {
 628                 g_match_info_fetch_pos (lc_mc_search->regex_match_info, 2, &start_pos, &end_pos);
 629             }
 630             else
 631             {
 632                 g_match_info_fetch_pos (lc_mc_search->regex_match_info, 0, &start_pos, &end_pos);
 633             }
 634 #else /* SEARCH_TYPE_GLIB */
 635             if (lc_mc_search->whole_words)
 636             {
 637                 start_pos = lc_mc_search->iovector[4];
 638                 end_pos = lc_mc_search->iovector[5];
 639             }
 640             else
 641             {
 642                 start_pos = lc_mc_search->iovector[0];
 643                 end_pos = lc_mc_search->iovector[1];
 644             }
 645 #endif /* SEARCH_TYPE_GLIB */
 646             if (found_len)
 647                 *found_len = end_pos - start_pos;
 648             lc_mc_search->normal_offset = lc_mc_search->start_buffer + start_pos;
 649             return TRUE;
 650         case COND__NOT_ALL_FOUND:
 651             break;
 652         default:
 653             g_string_free (lc_mc_search->regex_buffer, TRUE);
 654             lc_mc_search->regex_buffer = NULL;
 655             return FALSE;
 656         }
 657         if ((lc_mc_search->update_fn != NULL) &&
 658             ((lc_mc_search->update_fn) (user_data, current_pos) == MC_SEARCH_CB_ABORT))
 659             current_chr = MC_SEARCH_CB_ABORT;
 660
 661         if (current_chr == MC_SEARCH_CB_ABORT)
 662             break;
 663     }
 664     g_string_free (lc_mc_search->regex_buffer, TRUE);
 665     lc_mc_search->regex_buffer = NULL;
 666     lc_mc_search->error = MC_SEARCH_E_NOTFOUND;
 667
 668     if (current_chr != MC_SEARCH_CB_ABORT)
 669         lc_mc_search->error_str = g_strdup (_(STR_E_NOTFOUND));
 670     else
 671         lc_mc_search->error_str = NULL;
 672
 673     return FALSE;
 674 }
 675
 676 /* --------------------------------------------------------------------------------------------- */
 677 GString *
 678 mc_search_regex_prepare_replace_str (mc_search_t * lc_mc_search, GString * replace_str)
 679 {
 680     GString *ret;
 681     gchar *tmp_str;
 682
 683     int num_replace_tokens, lc_index;
 684     gsize loop;
 685     gsize len = 0;
 686     gchar *prev_str;
 687     replace_transform_type_t replace_flags = REPLACE_T_NO_TRANSFORM;
 688
 689     num_replace_tokens =
 690         mc_search_regex__get_max_num_of_replace_tokens (replace_str->str, replace_str->len);
 691
 692     if (lc_mc_search->num_results < 0)
 693         return g_string_new_len (replace_str->str, replace_str->len);
 694
 695     if (num_replace_tokens > lc_mc_search->num_results - 1
 696         || num_replace_tokens > MC_SEARCH__NUM_REPLACE_ARGS)
 697     {
 698         lc_mc_search->error = MC_SEARCH_E_REGEX_REPLACE;
 699         lc_mc_search->error_str = g_strdup (_(STR_E_RPL_NOT_EQ_TO_FOUND));
 700         return NULL;
 701     }
 702
 703     ret = g_string_new ("");
 704     prev_str = replace_str->str;
 705     for (loop = 0; loop < replace_str->len - 1; loop++)
 706     {
 707         lc_index = mc_search_regex__process_replace_str (replace_str, loop, &len, &replace_flags);
 708
 709         if (lc_index == -1)
 710         {
 711             if (len != 0)
 712             {
 713                 mc_search_regex__process_append_str (ret, prev_str,
 714                                                      replace_str->str - prev_str + loop,
 715                                                      &replace_flags);
 716                 mc_search_regex__process_append_str (ret, replace_str->str + loop + 1, len - 1,
 717                                                      &replace_flags);
 718                 prev_str = replace_str->str + loop + len;
 719                 loop += len - 1;
 720             }
 721             continue;
 722         }
 723
 724         if (lc_index == -2)
 725         {
 726             if (loop)
 727                 mc_search_regex__process_append_str (ret, prev_str,
 728                                                      replace_str->str - prev_str + loop,
 729                                                      &replace_flags);
 730             prev_str = replace_str->str + loop + len;
 731             loop += len - 1;
 732             continue;
 733         }
 734
 735         if (lc_index > lc_mc_search->num_results)
 736         {
 737             g_string_free (ret, TRUE);
 738             lc_mc_search->error = MC_SEARCH_E_REGEX_REPLACE;
 739             lc_mc_search->error_str = g_strdup_printf (_(STR_E_RPL_INVALID_TOKEN), lc_index);
 740             return NULL;
 741         }
 742
 743         tmp_str = mc_search_regex__get_token_by_num (lc_mc_search, lc_index);
 744         if (tmp_str == NULL)
 745             continue;
 746
 747         if (loop)
 748             mc_search_regex__process_append_str (ret, prev_str, replace_str->str - prev_str + loop,
 749                                                  &replace_flags);
 750         prev_str = replace_str->str + loop + len;
 751
 752         mc_search_regex__process_append_str (ret, tmp_str, -1, &replace_flags);
 753         g_free (tmp_str);
 754         loop += len - 1;
 755     }
 756     mc_search_regex__process_append_str (ret, prev_str,
 757                                          replace_str->str - prev_str + replace_str->len,
 758                                          &replace_flags);
 759
 760     return ret;
 761 }