104 lines
2.9 KiB
C++
104 lines
2.9 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2001-2014 Joel de Guzman
|
|
|
|
Distributed under 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)
|
|
==============================================================================*/
|
|
#if !defined(BOOST_SPIRIT_X3_SUPPORT_NO_CASE_SEPT_24_2014_1125PM)
|
|
#define BOOST_SPIRIT_X3_SUPPORT_NO_CASE_SEPT_24_2014_1125PM
|
|
|
|
#include <boost/spirit/home/x3/support/unused.hpp>
|
|
#include <boost/spirit/home/x3/support/context.hpp>
|
|
#include <boost/spirit/home/x3/char/char_class_tags.hpp>
|
|
|
|
namespace boost { namespace spirit { namespace x3
|
|
{
|
|
struct no_case_tag {};
|
|
|
|
template <typename Encoding>
|
|
struct case_compare
|
|
{
|
|
template <typename Char, typename CharSet>
|
|
bool in_set(Char ch, CharSet const& set)
|
|
{
|
|
return set.test(ch);
|
|
}
|
|
|
|
template <typename Char>
|
|
int32_t operator()(Char lc, Char rc) const
|
|
{
|
|
return lc - rc;
|
|
}
|
|
|
|
template <typename CharClassTag>
|
|
CharClassTag get_char_class_tag(CharClassTag tag) const
|
|
{
|
|
return tag;
|
|
}
|
|
};
|
|
|
|
template <typename Encoding>
|
|
struct no_case_compare
|
|
{
|
|
template <typename Char, typename CharSet>
|
|
bool in_set(Char ch_, CharSet const& set)
|
|
{
|
|
using char_type = typename Encoding::classify_type;
|
|
auto ch = char_type(ch_);
|
|
return set.test(ch)
|
|
|| set.test(Encoding::islower(ch)
|
|
? Encoding::toupper(ch) : Encoding::tolower(ch));
|
|
}
|
|
|
|
template <typename Char>
|
|
int32_t operator()(Char lc_, Char const rc_) const
|
|
{
|
|
using char_type = typename Encoding::classify_type;
|
|
auto lc = char_type(lc_);
|
|
auto rc = char_type(rc_);
|
|
return Encoding::islower(rc)
|
|
? Encoding::tolower(lc) - rc : Encoding::toupper(lc) - rc;
|
|
}
|
|
|
|
template <typename CharClassTag>
|
|
CharClassTag get_char_class_tag(CharClassTag tag) const
|
|
{
|
|
return tag;
|
|
}
|
|
|
|
alpha_tag get_char_class_tag(lower_tag ) const
|
|
{
|
|
return {};
|
|
}
|
|
|
|
alpha_tag get_char_class_tag(upper_tag ) const
|
|
{
|
|
return {};
|
|
}
|
|
|
|
};
|
|
|
|
template <typename Encoding>
|
|
case_compare<Encoding> get_case_compare_impl(unused_type const&)
|
|
{
|
|
return {};
|
|
}
|
|
|
|
template <typename Encoding>
|
|
no_case_compare<Encoding> get_case_compare_impl(no_case_tag const&)
|
|
{
|
|
return {};
|
|
}
|
|
|
|
template <typename Encoding, typename Context>
|
|
inline decltype(auto) get_case_compare(Context const& context)
|
|
{
|
|
return get_case_compare_impl<Encoding>(x3::get<no_case_tag>(context));
|
|
}
|
|
|
|
auto const no_case_compare_ = no_case_tag{};
|
|
|
|
}}}
|
|
|
|
#endif
|