1 /*============================================================================= 2 Copyright (c) 2001-2014 Joel de Guzman 3 4 Distributed under the Boost Software License, Version 1.0. (See accompanying 5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6 ==============================================================================*/ 7 #if !defined(BOOST_SPIRIT_X3_SUPPORT_NO_CASE_SEPT_24_2014_1125PM) 8 #define BOOST_SPIRIT_X3_SUPPORT_NO_CASE_SEPT_24_2014_1125PM 9 10 #include <boost/spirit/home/x3/support/unused.hpp> 11 #include <boost/spirit/home/x3/support/context.hpp> 12 #include <boost/spirit/home/x3/char/char_class_tags.hpp> 13 14 namespace boost { namespace spirit { namespace x3 15 { 16 struct no_case_tag {}; 17 18 template <typename Encoding> 19 struct case_compare 20 { 21 template <typename Char, typename CharSet> in_setboost::spirit::x3::case_compare22 bool in_set(Char ch, CharSet const& set) 23 { 24 return set.test(ch); 25 } 26 27 template <typename Char> operator ()boost::spirit::x3::case_compare28 int32_t operator()(Char lc, Char rc) const 29 { 30 return lc - rc; 31 } 32 33 template <typename CharClassTag> get_char_class_tagboost::spirit::x3::case_compare34 CharClassTag get_char_class_tag(CharClassTag tag) const 35 { 36 return tag; 37 } 38 }; 39 40 template <typename Encoding> 41 struct no_case_compare 42 { 43 template <typename Char, typename CharSet> in_setboost::spirit::x3::no_case_compare44 bool in_set(Char ch_, CharSet const& set) 45 { 46 using char_type = typename Encoding::classify_type; 47 auto ch = char_type(ch_); 48 return set.test(ch) 49 || set.test(Encoding::islower(ch) 50 ? Encoding::toupper(ch) : Encoding::tolower(ch)); 51 } 52 53 template <typename Char> operator ()boost::spirit::x3::no_case_compare54 int32_t operator()(Char lc_, Char const rc_) const 55 { 56 using char_type = typename Encoding::classify_type; 57 auto lc = char_type(lc_); 58 auto rc = char_type(rc_); 59 return Encoding::islower(rc) 60 ? Encoding::tolower(lc) - rc : Encoding::toupper(lc) - rc; 61 } 62 63 template <typename CharClassTag> get_char_class_tagboost::spirit::x3::no_case_compare64 CharClassTag get_char_class_tag(CharClassTag tag) const 65 { 66 return tag; 67 } 68 get_char_class_tagboost::spirit::x3::no_case_compare69 alpha_tag get_char_class_tag(lower_tag ) const 70 { 71 return {}; 72 } 73 get_char_class_tagboost::spirit::x3::no_case_compare74 alpha_tag get_char_class_tag(upper_tag ) const 75 { 76 return {}; 77 } 78 79 }; 80 81 template <typename Encoding> get_case_compare_impl(unused_type const &)82 case_compare<Encoding> get_case_compare_impl(unused_type const&) 83 { 84 return {}; 85 } 86 87 template <typename Encoding> get_case_compare_impl(no_case_tag const &)88 no_case_compare<Encoding> get_case_compare_impl(no_case_tag const&) 89 { 90 return {}; 91 } 92 93 template <typename Encoding, typename Context> get_case_compare(Context const & context)94 inline decltype(auto) get_case_compare(Context const& context) 95 { 96 return get_case_compare_impl<Encoding>(x3::get<no_case_tag>(context)); 97 } 98 99 auto const no_case_compare_ = no_case_tag{}; 100 101 }}} 102 103 #endif 104