ceph/src/boost/boost/test/utils/runtime/cla/argv_traverser.hpp

   1 //  (C) Copyright Gennadiy Rozental 2001.
   2 //  Use, modification, and distribution are subject to the
   3 //  Boost Software License, Version 1.0. (See accompanying file
   4 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 //  See http://www.boost.org/libs/test for the library home page.
   7 //
   8 //  File        : $RCSfile$
   9 //
  10 //  Version     : $Revision$
  11 //
  12 //  Description : defines facility to hide input traversing details
  13 // ***************************************************************************
  14
  15 #ifndef BOOST_TEST_UTILS_RUNTIME_CLA_ARGV_TRAVERSER_HPP
  16 #define BOOST_TEST_UTILS_RUNTIME_CLA_ARGV_TRAVERSER_HPP
  17
  18 // Boost.Test Runtime parameters
  19 #include <boost/test/utils/runtime/fwd.hpp>
  20
  21 #include <boost/test/detail/suppress_warnings.hpp>
  22
  23 namespace boost {
  24 namespace runtime {
  25 namespace cla {
  26
  27 // ************************************************************************** //
  28 // **************          runtime::cla::argv_traverser        ************** //
  29 // ************************************************************************** //
  30
  31 class argv_traverser {
  32     typedef char const** argv_type;
  33 public:
  34     /// Constructs traverser based on argc/argv pair
  35     /// argv is taken "by reference" and later can be
  36     /// updated in remainder method
  37     argv_traverser( int argc, argv_type argv )
  38     : m_argc( argc )
  39     , m_curr_token( 0 )
  40     , m_token_size( 0 )
  41     , m_argv( argv )
  42     {
  43         // save program name
  44         save_token();
  45     }
  46
  47     /// Returns new argc
  48     int         remainder()
  49     {
  50         return m_argc;
  51     }
  52
  53     /// Returns true, if we reached end on input
  54     bool        eoi() const
  55     {
  56         return m_curr_token == m_argc;
  57     }
  58
  59     /// Returns current token in the input
  60     cstring     current_token()
  61     {
  62         if( eoi() )
  63             return cstring();
  64
  65         return cstring( m_argv[m_curr_token], m_token_size );
  66     }
  67
  68     /// Saves current token for remainder
  69     void        save_token()
  70     {
  71         ++m_curr_token;
  72
  73         if( !eoi() )
  74             m_token_size = ::strlen( m_argv[m_curr_token] );
  75     }
  76
  77     /// Commit current token and iterate to next one
  78     void        next_token()
  79     {
  80         if( !eoi() ) {
  81             for( std::size_t i = m_curr_token; i < m_argc-1; ++i )
  82                 m_argv[i] = m_argv[i + 1];
  83
  84             --m_argc;
  85
  86             m_token_size = ::strlen( m_argv[m_curr_token] );
  87         }
  88     }
  89
  90 private:
  91
  92     // Data members
  93     std::size_t m_argc;         // total number of arguments
  94     std::size_t m_curr_token;   // current token index in argv
  95     std::size_t m_token_size;   // current token size
  96     argv_type   m_argv;         // all arguments
  97 };
  98
  99 } // namespace cla
 100 } // namespace runtime
 101 } // namespace boost
 102
 103 #include <boost/test/detail/enable_warnings.hpp>
 104
 105 #endif // BOOST_TEST_UTILS_RUNTIME_CLA_ARGV_TRAVERSER_HPP