ceph/src/boost/libs/regex/performance/xpressive.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 #include "performance.hpp"
  10 #include <boost/xpressive/xpressive.hpp>
  11
  12 using namespace boost::xpressive;
  13
  14 struct xpressive_regex : public abstract_regex
  15 {
  16 private:
  17    cregex e;
  18    cmatch what;
  19 public:
  20    virtual bool set_expression(const char* pe, bool isperl)
  21    {
  22       if(!isperl)
  23          return false;
  24       try
  25       {
  26          e = cregex::compile(pe, regex_constants::ECMAScript);
  27       }
  28       catch(const std::exception&)
  29       {
  30          return false;
  31       }
  32       return true;
  33    }
  34    virtual bool match_test(const char* text);
  35    virtual unsigned find_all(const char* text);
  36    virtual std::string name();
  37
  38    struct initializer
  39    {
  40       initializer()
  41       {
  42          xpressive_regex::register_instance(boost::shared_ptr<abstract_regex>(new xpressive_regex));
  43       }
  44       void do_nothing()const {}
  45    };
  46    static const initializer init;
  47 };
  48
  49 const xpressive_regex::initializer xpressive_regex::init;
  50
  51
  52 bool xpressive_regex::match_test(const char * text)
  53 {
  54    return regex_match(text, what, e);
  55 }
  56
  57 unsigned xpressive_regex::find_all(const char * text)
  58 {
  59    cregex_token_iterator i(text, text + std::strlen(text), e), j;
  60    unsigned count = 0;
  61    while(i != j)
  62    {
  63       ++i;
  64       ++count;
  65    }
  66    return count;
  67 }
  68
  69 std::string xpressive_regex::name()
  70 {
  71    init.do_nothing();
  72    return "boost::xpressive::cregex";
  73 }
  74