mirror of
https://github.com/yuzu-emu/ext-boost.git
synced 2024-12-23 11:35:28 +00:00
147 lines
3.3 KiB
C++
147 lines
3.3 KiB
C++
/*
|
|
*
|
|
* Copyright (c) 1998-2002
|
|
* John Maddock
|
|
*
|
|
* Use, modification and distribution are subject to the
|
|
* Boost Software License, Version 1.0. (See accompanying file
|
|
* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* LOCATION: see http://www.boost.org for most recent version.
|
|
* FILE: primary_transform.hpp
|
|
* VERSION: see <boost/version.hpp>
|
|
* DESCRIPTION: Heuristically determines the sort string format in use
|
|
* by the current locale.
|
|
*/
|
|
|
|
#ifndef BOOST_REGEX_PRIMARY_TRANSFORM
|
|
#define BOOST_REGEX_PRIMARY_TRANSFORM
|
|
|
|
#ifdef BOOST_MSVC
|
|
#pragma warning(push)
|
|
#pragma warning(disable: 4103)
|
|
#endif
|
|
#ifdef BOOST_HAS_ABI_HEADERS
|
|
# include BOOST_ABI_PREFIX
|
|
#endif
|
|
#ifdef BOOST_MSVC
|
|
#pragma warning(pop)
|
|
#endif
|
|
|
|
namespace boost{
|
|
namespace BOOST_REGEX_DETAIL_NS{
|
|
|
|
|
|
enum{
|
|
sort_C,
|
|
sort_fixed,
|
|
sort_delim,
|
|
sort_unknown
|
|
};
|
|
|
|
template <class S, class charT>
|
|
unsigned count_chars(const S& s, charT c)
|
|
{
|
|
//
|
|
// Count how many occurances of character c occur
|
|
// in string s: if c is a delimeter between collation
|
|
// fields, then this should be the same value for all
|
|
// sort keys:
|
|
//
|
|
unsigned int count = 0;
|
|
for(unsigned pos = 0; pos < s.size(); ++pos)
|
|
{
|
|
if(s[pos] == c) ++count;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
|
|
template <class traits, class charT>
|
|
unsigned find_sort_syntax(const traits* pt, charT* delim)
|
|
{
|
|
//
|
|
// compare 'a' with 'A' to see how similar they are,
|
|
// should really use a-accute but we can't portably do that,
|
|
//
|
|
typedef typename traits::string_type string_type;
|
|
typedef typename traits::char_type char_type;
|
|
|
|
// Suppress incorrect warning for MSVC
|
|
(void)pt;
|
|
|
|
char_type a[2] = {'a', '\0', };
|
|
string_type sa(pt->transform(a, a+1));
|
|
if(sa == a)
|
|
{
|
|
*delim = 0;
|
|
return sort_C;
|
|
}
|
|
char_type A[2] = { 'A', '\0', };
|
|
string_type sA(pt->transform(A, A+1));
|
|
char_type c[2] = { ';', '\0', };
|
|
string_type sc(pt->transform(c, c+1));
|
|
|
|
int pos = 0;
|
|
while((pos <= static_cast<int>(sa.size())) && (pos <= static_cast<int>(sA.size())) && (sa[pos] == sA[pos])) ++pos;
|
|
--pos;
|
|
if(pos < 0)
|
|
{
|
|
*delim = 0;
|
|
return sort_unknown;
|
|
}
|
|
//
|
|
// at this point sa[pos] is either the end of a fixed width field
|
|
// or the character that acts as a delimiter:
|
|
//
|
|
charT maybe_delim = sa[pos];
|
|
if((pos != 0) && (count_chars(sa, maybe_delim) == count_chars(sA, maybe_delim)) && (count_chars(sa, maybe_delim) == count_chars(sc, maybe_delim)))
|
|
{
|
|
*delim = maybe_delim;
|
|
return sort_delim;
|
|
}
|
|
//
|
|
// OK doen't look like a delimiter, try for fixed width field:
|
|
//
|
|
if((sa.size() == sA.size()) && (sa.size() == sc.size()))
|
|
{
|
|
// note assumes that the fixed width field is less than
|
|
// (numeric_limits<charT>::max)(), should be true for all types
|
|
// I can't imagine 127 character fields...
|
|
*delim = static_cast<charT>(++pos);
|
|
return sort_fixed;
|
|
}
|
|
//
|
|
// don't know what it is:
|
|
//
|
|
*delim = 0;
|
|
return sort_unknown;
|
|
}
|
|
|
|
|
|
} // namespace BOOST_REGEX_DETAIL_NS
|
|
} // namespace boost
|
|
|
|
#ifdef BOOST_MSVC
|
|
#pragma warning(push)
|
|
#pragma warning(disable: 4103)
|
|
#endif
|
|
#ifdef BOOST_HAS_ABI_HEADERS
|
|
# include BOOST_ABI_SUFFIX
|
|
#endif
|
|
#ifdef BOOST_MSVC
|
|
#pragma warning(pop)
|
|
#endif
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|