| /*============================================================================= |
| 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 |