sys/share/cppregex.cpp

   1 /* NetHack 3.6  cppregex.cpp    $NHDT-Date$  $NHDT-Branch$:$NHDT-Revision$ */
   2 /* Copyright (c) Sean Hunt  2015.                                 */
   3 /* NetHack may be freely redistributed.  See license for details. */
   4
   5 #include <regex>
   6 #include <memory>
   7
   8 /* nhregex interface documented in sys/share/posixregex.c */
   9
  10 extern "C" {
  11   #include <hack.h>
  12
  13   extern const char regex_id[] = "cppregex";
  14
  15   struct nhregex {
  16     std::unique_ptr<std::regex> re;
  17     std::unique_ptr<std::regex_error> err;
  18   };
  19
  20   struct nhregex *regex_init(void) {
  21     return new nhregex;
  22   }
  23
  24   boolean regex_compile(const char *s, struct nhregex *re) {
  25     if (!re)
  26       return FALSE;
  27     try {
  28       re->re.reset(new std::regex(s, (std::regex::extended
  29                                     | std::regex::nosubs
  30                                     | std::regex::optimize)));
  31       re->err.reset(nullptr);
  32       return TRUE;
  33     } catch (const std::regex_error& err) {
  34       re->err.reset(new std::regex_error(err));
  35       re->re.reset(nullptr);
  36       return FALSE;
  37     }
  38   }
  39
  40   const char *regex_error_desc(struct nhregex *re) {
  41     if (re->err)
  42       return re->err->what();
  43     else
  44       return nullptr;
  45   }
  46
  47   boolean regex_match(const char *s, struct nhregex *re) {
  48     if (!re->re)
  49       return false;
  50     try {
  51       return regex_search(s, *re->re, std::regex_constants::match_any);
  52     } catch (const std::regex_error& err) {
  53       return false;
  54     }
  55   }
  56
  57   void regex_free(struct nhregex *re) {
  58     delete re;
  59   }
  60 }