3
* Copyright (c) 1998-2002
6
* Permission to use, copy, modify, distribute and sell this software
7
* and its documentation for any purpose is hereby granted without fee,
8
* provided that the above copyright notice appear in all copies and
9
* that both that copyright notice and this permission notice appear
10
* in supporting documentation. Dr John Maddock makes no representations
11
* about the suitability of this software for any purpose.
12
* It is provided "as is" without express or implied warranty.
17
* LOCATION: see http://www.boost.org for most recent version.
18
* FILE: primary_transform.hpp
19
* VERSION: see <boost/version.hpp>
20
* DESCRIPTION: Heuristically determines the sort string format in use
21
* by the current locale.
35
template <class S, class charT>
36
unsigned count_chars(const S& s, charT c)
38
unsigned int count = 0;
39
for(unsigned pos = 0; pos < s.size(); ++pos)
41
if(s[pos] == c) ++count;
47
template <class traits, class charT>
48
unsigned find_sort_syntax(const traits* pt, charT* delim)
51
// compare 'a' with 'A' to see how similar they are,
52
// should really use a-accute but we can't portably do that,
54
typedef typename traits::string_type string_type;
55
typedef typename traits::char_type char_type;
57
// Suppress incorrect warning for MSVC
60
string_type a(1, (char_type)'a');
68
string_type A(1, (char_type)'A');
71
string_type c(1, (char_type)';');
76
while((pos <= static_cast<int>(sa.size())) && (pos <= static_cast<int>(sA.size())) && (sa[pos] == sA[pos])) ++pos;
84
// at this point sa[pos] is either the end of a fixed with field
85
// or the character that acts as a delimiter:
87
charT maybe_delim = sa[pos];
88
if((pos != 0) && (count_chars(sa, maybe_delim) == count_chars(sA, maybe_delim)) && (count_chars(sa, maybe_delim) == count_chars(c, maybe_delim)))
94
// OK doen't look like a delimiter, try for fixed width field:
96
if((sa.size() == sA.size()) && (sa.size() == c.size()))
98
// note assumes that the fixed width field is less than
99
// numeric_limits<charT>::max(), should be true for all types
100
// I can't imagine 127 character fields...
101
*delim = static_cast<charT>(++pos);
105
// don't know what it is:
112
} // namespace re_detail