char_traits.hxx

00001 // char_traits.hxx: this file is part of the Vaucanson project.
00002 //
00003 // Vaucanson, a generic library for finite state machines.
00004 //
00005 // Copyright (C) 2004, 2006 The Vaucanson Group.
00006 //
00007 // This program is free software; you can redistribute it and/or
00008 // modify it under the terms of the GNU General Public License
00009 // as published by the Free Software Foundation; either version 2
00010 // of the License, or (at your option) any later version.
00011 //
00012 // The complete GNU General Public Licence Notice can be found as the
00013 // `COPYING' file in the root directory.
00014 //
00015 // The Vaucanson Group consists of people listed in the `AUTHORS' file.
00016 //
00017 #ifndef VCSN_MISC_CHAR_TRAITS_HXX
00018 # define VCSN_MISC_CHAR_TRAITS_HXX
00019 
00020 # include <vaucanson/misc/char_traits.hh>
00021 # include <vaucanson/misc/contract.hh>
00022 
00023 namespace vcsn
00024 {
00025   namespace misc
00026   {
00027 
00028   /*-----------------.
00029   | generic_int_type |
00030   `-----------------*/
00031 
00032     template <class CharT>
00033     generic_int_type<CharT>::generic_int_type () :
00034       //     val_ (char_type ()),
00035       eof_ (true)
00036     {
00037     }
00038 
00039     template <class CharT>
00040     generic_int_type<CharT>::generic_int_type (const char_type& val) :
00041       val_ (val), eof_ (false)
00042     {
00043     }
00044 
00045     template <class CharT>
00046     generic_int_type<CharT>::operator CharT () const
00047     {
00048       return val_;
00049     }
00050 
00051     template <class CharT>
00052     bool
00053     generic_int_type<CharT>::
00054     operator== (const generic_int_type<CharT>& rhs) const
00055     {
00056       if (rhs.eof_)
00057         return eof_;
00058       else
00059         return not eof_ and (rhs.val_ == val_);
00060     }
00061 
00062     template <class CharT>
00063     bool
00064     generic_int_type<CharT>::eof () const
00065     {
00066       return eof_;
00067     }
00068 
00069   /*------------.
00070   | char_traits |
00071   `------------*/
00072 
00073     template <typename CharT>
00074     void
00075     char_traits<CharT>::assign (char_type& lhs, const char_type& rhs)
00076     {
00077       lhs = rhs;
00078     }
00079 
00080     template <typename CharT>
00081     bool
00082     char_traits<CharT>::eq (const char_type& lhs, const char_type& rhs)
00083     {
00084       return lhs == rhs;
00085     }
00086 
00087     template <typename CharT>
00088     bool
00089     char_traits<CharT>::lt (const char_type& lhs, const char_type& rhs)
00090     {
00091       return lhs < rhs;
00092     }
00093 
00094     template <typename CharT>
00095     int
00096     char_traits<CharT>::compare (const char_type* p,
00097                                 const char_type* q,
00098                                 size_t n)
00099     {
00100       size_t i;
00101 
00102       for (i = 0; (i < n) and eq (p[i], q[i]); ++i)
00103         ;
00104       if (i == n)
00105         return 0;
00106       else
00107         return lt (p[i], q[i]) ? -1 : 1;
00108     }
00109 
00110     template <typename CharT>
00111     size_t
00112     char_traits<CharT>::length (const char_type* p)
00113     {
00114       size_t i = 0;
00115       while (not eq (p[i], char_type ()))
00116         ++i;
00117       return i;
00118     }
00119 
00120     template <typename CharT>
00121     const typename char_traits<CharT>::char_type*
00122     char_traits<CharT>::find (const char_type* p,
00123                              size_t n,
00124                              const char_type& c)
00125     {
00126       size_t i;
00127 
00128       for (i = 0; (i < n) and not eq (p[i], c); ++i)
00129         ;
00130       return i < n ? p + i: 0;
00131     }
00132 
00133     template <typename CharT>
00134     typename char_traits<CharT>::char_type*
00135     char_traits<CharT>::move (char_type* s, const char_type* p, size_t n)
00136     {
00137       // FIXME:  This  code has  been  (almost)  dummy  pasted from  the
00138       // standard library. Maybe it should  be usefull to have a special
00139       // optimized version when pointers do not overlap.
00140 
00141       char_type* tmp = new char_type[n];
00142       copy (tmp, p, n);
00143       copy (s, tmp, n);
00144       delete[] tmp;
00145       return s;
00146     }
00147 
00148     template <typename CharT>
00149     typename char_traits<CharT>::char_type*
00150     char_traits<CharT>::copy (char_type* s, const char_type* p, size_t n)
00151     {
00152       precondition ((p < s) or (p > s + n));
00153 
00154       for (size_t i = 0; i < n; ++i)
00155         assign (s[i], p[i]);
00156       return s;
00157     }
00158 
00159     template <typename CharT>
00160     typename char_traits<CharT>::char_type*
00161     char_traits<CharT>::assign (char_type* s, size_t n, char_type c)
00162     {
00163       for (size_t i = 0; i < n; ++i)
00164         assign (s[i], c);
00165       return s;
00166     }
00167 
00168     template <typename CharT>
00169     typename char_traits<CharT>::int_type
00170     char_traits<CharT>::not_eof (const int_type& e)
00171     {
00172       return eq_int_type (e, eof ()) ? int_type (char_type ()) : e;
00173     }
00174 
00175     template <typename CharT>
00176     typename char_traits<CharT>::char_type
00177     char_traits<CharT>::to_char_type (const int_type& e)
00178     {
00179       return e; // Calls generic_int_type<char_type>::operator CharT ().
00180     }
00181 
00182     template <typename CharT>
00183     typename char_traits<CharT>::int_type
00184     char_traits<CharT>::to_int_type (const char_type& e)
00185     {
00186       return int_type (e);
00187     }
00188 
00189     template <typename CharT>
00190     bool
00191     char_traits<CharT>::eq_int_type (const int_type& e, const int_type& f)
00192     {
00193       return e == f;
00194     }
00195 
00196     template <typename CharT>
00197     typename char_traits<CharT>::int_type
00198     char_traits<CharT>::eof ()
00199     {
00200       return int_type ();
00201     }
00202 
00203   } // end of namespace misc
00204 } // end of namespace vcsn
00205 
00206 #endif // ! VCSN_MISC_CHAR_TRAITS_HXX

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