~mdw / anag / blame
| Commit | Line | Data |
|---|---|---|
| d9af4a2b | 1 | /* -*-c-*- |
| 2 | * | |
| d9af4a2b | 3 | * Matches Perl-compatible regular expressions |
| 4 | * | |
| 5 | * (c) 2002 Mark Wooding | |
| 6 | */ | |
| 7 | ||
| 0279756e | 8 | /*----- Licensing notice --------------------------------------------------* |
| d9af4a2b | 9 | * |
| 10 | * This file is part of Anag: a simple wordgame helper. | |
| 11 | * | |
| 12 | * Anag is free software; you can redistribute it and/or modify | |
| 13 | * it under the terms of the GNU General Public License as published by | |
| 14 | * the Free Software Foundation; either version 2 of the License, or | |
| 15 | * (at your option) any later version. | |
| 0279756e | 16 | * |
| d9af4a2b | 17 | * Anag is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 20 | * GNU General Public License for more details. | |
| 0279756e | 21 | * |
| d9af4a2b | 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with Anag; if not, write to the Free Software Foundation, | |
| 24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
| 25 | */ | |
| 26 | ||
| d9af4a2b | 27 | /*----- Header files ------------------------------------------------------*/ |
| 28 | ||
| d9af4a2b | 29 | #include "anag.h" |
| 7c2b74ab | 30 | |
| d9af4a2b | 31 | #include <pcre.h> |
| 32 | ||
| 33 | /*----- Data structures ---------------------------------------------------*/ | |
| 34 | ||
| 35 | typedef struct node_pcre { | |
| 36 | node n; | |
| 37 | const char *s; | |
| 38 | pcre *rx; | |
| 39 | pcre_extra *rx_study; | |
| 40 | int *ovec; | |
| 41 | int ovecsz; | |
| 42 | } node_pcre; | |
| 43 | ||
| 44 | /*----- Main code ---------------------------------------------------------*/ | |
| 45 | ||
| 46 | /* --- Node matcher --- */ | |
| 47 | ||
| 48 | static int n_pcre(node *nn, const char *p, size_t sz) | |
| 49 | { | |
| 50 | node_pcre *n = (node_pcre *)nn; | |
| 51 | int e; | |
| 52 | ||
| 53 | e = pcre_exec(n->rx, n->rx_study, p, sz, 0, 0, n->ovec, n->ovecsz); | |
| 7c2b74ab MW |
54 | if (e >= 0) return (1); |
| 55 | if (e == PCRE_ERROR_NOMATCH) return (0); | |
| d9af4a2b | 56 | die("unexpected PCRE error code %d", e); |
| d9af4a2b | 57 | } |
| 58 | ||
| 59 | /* --- Node creation --- */ | |
| 60 | ||
| 61 | node *pcrenode(const char *const *av) | |
| 62 | { | |
| 63 | node_pcre *n = xmalloc(sizeof(*n)); | |
| 64 | const char *e; | |
| 65 | int eo; | |
| 66 | int c; | |
| 67 | ||
| 68 | n->n.func = n_pcre; | |
| 7c2b74ab MW |
69 | |
| 70 | n->rx = pcre_compile(av[0], PCRE_CASELESS, &e, &eo, 0); | |
| 71 | if (!n->rx) die("bad regular expression `%s': %s", av[0], e); | |
| d9af4a2b | 72 | n->rx_study = pcre_study(n->rx, 0, &e); |
| 7c2b74ab MW |
73 | if (e) die("error studying pattern `%s': %s", av[0], e); |
| 74 | pcre_fullinfo(n->rx, n->rx_study, PCRE_INFO_CAPTURECOUNT, &c); | |
| 75 | n->ovecsz = 2*c; | |
| 76 | n->ovec = xmalloc(n->ovecsz*sizeof(*n->ovec)); | |
| 77 | ||
| d9af4a2b | 78 | return (&n->n); |
| 79 | } | |
| 80 | ||
| 81 | /*----- That's all, folks -------------------------------------------------*/ |