diff options
Diffstat (limited to 'plug-ins/script-fu/script-fu-regex.c')
| -rw-r--r-- | plug-ins/script-fu/script-fu-regex.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/plug-ins/script-fu/script-fu-regex.c b/plug-ins/script-fu/script-fu-regex.c new file mode 100644 index 0000000..02255d2 --- /dev/null +++ b/plug-ins/script-fu/script-fu-regex.c @@ -0,0 +1,179 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * This program 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. + * + * This program 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 <https://www.gnu.org/licenses/>. + */ + +/* Based on re.c + * + * Henry Spencer's implementation of Regular Expressions, + * used for TinyScheme + * + * Refurbished by Stephen Gildea + * + * Ported to GRegex and de-uglified by Michael Natterer + */ + +#include "config.h" + +#include "tinyscheme/scheme-private.h" +#include "script-fu-regex.h" + + +/* local function prototypes */ + +static pointer foreign_re_match (scheme *sc, + pointer args); +static void set_vector_elem (pointer vec, + int ielem, + pointer newel); + + +/* public functions */ + +void +script_fu_regex_init (scheme *sc) +{ + sc->vptr->scheme_define (sc, + sc->global_env, + sc->vptr->mk_symbol(sc,"re-match"), + sc->vptr->mk_foreign_func(sc, foreign_re_match)); + +#if 0 + sc->vptr->load_string + (sc, + ";; return the substring of STRING matched in MATCH-VECTOR,\n" + ";; the Nth subexpression match (default 0).\n" + "\n" + "(define (re-match-nth string match-vector . n)\n" + " (let ((n (if (pair? n) (car n) 0)))\n" + " (substring string (car (vector-ref match-vector n))\n" + " (cdr (vector-ref match-vector n)))))\n" + "(define (re-before-nth string match-vector . n)\n" + " (let ((n (if (pair? n) (car n) 0)))\n" + " (substring string 0 (car (vector-ref match-vector n)))))\n" + "(define (re-after-nth string match-vector . n)\n" + " (let ((n (if (pair? n) (car n) 0)))\n" + " (substring string (cdr (vector-ref match-vector n))\n" + " (string-length string))))\n"); +#endif +} + + +/* private functions */ + +static pointer +foreign_re_match (scheme *sc, + pointer args) +{ + pointer retval = sc->F; + gboolean success; + gboolean is_valid_utf8; + GRegex *regex; + pointer first_arg, second_arg; + pointer third_arg = sc->NIL; + char *string; + char *pattern; + int num = 0; + + if (!((args != sc->NIL) + && sc->vptr->is_string ((first_arg = sc->vptr->pair_car (args))) + && (args = sc->vptr->pair_cdr (args)) + && sc->vptr->is_pair (args) + && sc->vptr->is_string ((second_arg = sc->vptr->pair_car (args))))) + { + return sc->F; + } + + pattern = sc->vptr->string_value (first_arg); + string = sc->vptr->string_value (second_arg); + + is_valid_utf8 = g_utf8_validate (string, -1, NULL); + + args = sc->vptr->pair_cdr (args); + + if (args != sc->NIL) + { + if (!(sc->vptr->is_pair (args) + && sc->vptr->is_vector ((third_arg = sc->vptr->pair_car (args))))) + { + return sc->F; + } + else + { + num = third_arg->_object._number.value.ivalue; + } + } + + regex = g_regex_new (pattern, G_REGEX_EXTENDED, 0, NULL); + if (! regex) + return sc->F; + + if (! num) + { + success = g_regex_match (regex, string, 0, NULL); + } + else + { + GMatchInfo *match_info; + gint i; + + success = g_regex_match (regex, string, 0, &match_info); + + for (i = 0; i < num; i++) + { + gint start, end; + + g_match_info_fetch_pos (match_info, i, &start, &end); + + if (is_valid_utf8) + { + start = g_utf8_pointer_to_offset (string, string + start); + end = g_utf8_pointer_to_offset (string, string + end); + } + +#undef cons + set_vector_elem (third_arg, i, + sc->vptr->cons(sc, + sc->vptr->mk_integer(sc, start), + sc->vptr->mk_integer(sc, end))); + } + + g_match_info_free (match_info); + } + + if (success) + retval = sc->T; + + g_regex_unref (regex); + + return retval; +} + +static void +set_vector_elem (pointer vec, + int ielem, + pointer newel) +{ + int n = ielem / 2; + + if (ielem % 2 == 0) + { + vec[1 + n]._object._cons._car = newel; + } + else + { + vec[1 + n]._object._cons._cdr = newel; + } +} |