ceph/src/boost/libs/regex/performance/std.cpp

   1 ///////////////////////////////////////////////////////////////
   2 //  Copyright 2015 John Maddock. Distributed under the Boost
   3 //  Software License, Version 1.0. (See accompanying file
   4 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_
   5 //
   6
   7 #include <boost/config.hpp>
   8
   9 #ifndef BOOST_NO_CXX11_HDR_REGEX
  10
  11 #include "performance.hpp"
  12 #include <regex>
  13
  14 struct std_regex : public abstract_regex
  15 {
  16 private:
  17    std::regex e;
  18    std::cmatch what;
  19 public:
  20    virtual bool set_expression(const char* pe, bool isperl)
  21    {
  22       try
  23       {
  24          e.assign(pe, isperl ? std::regex::ECMAScript : std::regex::extended);
  25       }
  26       catch(const std::exception&)
  27       {
  28          return false;
  29       }
  30       return true;
  31    }
  32    virtual bool match_test(const char* text);
  33    virtual unsigned find_all(const char* text);
  34    virtual std::string name();
  35
  36    struct initializer
  37    {
  38       initializer()
  39       {
  40          std_regex::register_instance(boost::shared_ptr<abstract_regex>(new std_regex));
  41       }
  42       void do_nothing()const {}
  43    };
  44    static const initializer init;
  45 };
  46
  47 const std_regex::initializer std_regex::init;
  48
  49
  50 bool std_regex::match_test(const char * text)
  51 {
  52    return regex_match(text, what, e);
  53 }
  54
  55 unsigned std_regex::find_all(const char * text)
  56 {
  57    std::regex_iterator<const char*> i(text, text + std::strlen(text), e), j;
  58    unsigned count = 0;
  59    while(i != j)
  60    {
  61       ++i;
  62       ++count;
  63    }
  64    return count;
  65 }
  66
  67 std::string std_regex::name()
  68 {
  69    init.do_nothing();
  70    return "std::regex";
  71 }
  72
  73 #endif