/*=============================================================================
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Copyright (c) 2001-2014 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(BOOST_SPIRIT_X3_SUPPORT_NO_CASE_SEPT_24_2014_1125PM)
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#define BOOST_SPIRIT_X3_SUPPORT_NO_CASE_SEPT_24_2014_1125PM
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#include <boost/spirit/home/x3/support/unused.hpp>
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#include <boost/spirit/home/x3/support/context.hpp>
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#include <boost/spirit/home/x3/char/char_class_tags.hpp>
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namespace boost { namespace spirit { namespace x3
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{
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struct no_case_tag {};
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template <typename Encoding>
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struct case_compare
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{
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template <typename Char, typename CharSet>
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bool in_set(Char ch, CharSet const& set)
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{
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return set.test(ch);
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}
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template <typename Char>
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int32_t operator()(Char lc, Char rc) const
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{
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return lc - rc;
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}
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template <typename CharClassTag>
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CharClassTag get_char_class_tag(CharClassTag tag) const
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{
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return tag;
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}
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};
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template <typename Encoding>
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struct no_case_compare
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{
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template <typename Char, typename CharSet>
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bool in_set(Char ch_, CharSet const& set)
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{
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using char_type = typename Encoding::classify_type;
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auto ch = char_type(ch_);
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return set.test(ch)
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|| set.test(Encoding::islower(ch)
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? Encoding::toupper(ch) : Encoding::tolower(ch));
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}
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template <typename Char>
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int32_t operator()(Char lc_, Char const rc_) const
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{
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using char_type = typename Encoding::classify_type;
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auto lc = char_type(lc_);
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auto rc = char_type(rc_);
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return Encoding::islower(rc)
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? Encoding::tolower(lc) - rc : Encoding::toupper(lc) - rc;
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}
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template <typename CharClassTag>
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CharClassTag get_char_class_tag(CharClassTag tag) const
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{
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return tag;
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}
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alpha_tag get_char_class_tag(lower_tag ) const
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{
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return {};
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}
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alpha_tag get_char_class_tag(upper_tag ) const
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{
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return {};
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}
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};
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template <typename Encoding>
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case_compare<Encoding> get_case_compare_impl(unused_type const&)
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{
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return {};
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}
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template <typename Encoding>
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no_case_compare<Encoding> get_case_compare_impl(no_case_tag const&)
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{
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return {};
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}
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template <typename Encoding, typename Context>
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inline decltype(auto) get_case_compare(Context const& context)
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{
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return get_case_compare_impl<Encoding>(x3::get<no_case_tag>(context));
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}
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auto const no_case_compare_ = no_case_tag{};
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}}}
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#endif
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