mirror of
https://github.com/matrix-construct/construct
synced 2024-12-30 17:34:04 +01:00
113 lines
2.8 KiB
C++
113 lines
2.8 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#if defined(__clang__)
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template<class Derived>
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struct [[clang::internal_linkage, gnu::visibility("internal")]]
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boost::spirit::qi::char_parser
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<
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Derived,
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typename boost::spirit::char_encoding::standard::char_type,
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typename boost::mpl::if_c<true, boost::spirit::unused_type, typename boost::spirit::char_encoding::standard::char_type>::type
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>
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:primitive_parser
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<
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literal_char<char_encoding::standard, true, false>
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>
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{
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using CharEncoding = boost::spirit::char_encoding::standard;
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using char_type = typename CharEncoding::char_type;
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struct char_parser_id;
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template<class Context,
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class Iterator>
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struct attribute
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{
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using type = char_type;
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};
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template<class Iterator,
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class Context,
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class Skipper,
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class Attribute>
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[[gnu::hot]]
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bool parse(Iterator &__restrict__ start, const Iterator &__restrict__ stop, Context &c, const Skipper &s, Attribute &a) const
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{
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qi::skip_over(start, stop, s);
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if(likely(start != stop))
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{
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if(this->derived().test(*start, c))
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{
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spirit::traits::assign_to(*start, a);
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++start;
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return true;
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}
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else return false;
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}
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else return false;
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}
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};
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#endif
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#if defined(__clang__)
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template<>
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struct [[clang::internal_linkage, gnu::visibility("internal")]]
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boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard, true, false>
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:char_parser
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<
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literal_char<char_encoding::standard, true, false>,
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typename char_encoding::standard::char_type,
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typename mpl::if_c<true, unused_type, typename char_encoding::standard::char_type>::type
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>
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{
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using CharEncoding = boost::spirit::char_encoding::standard;
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using char_type = typename CharEncoding::char_type;
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using char_encoding = CharEncoding;
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template<class Context,
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class Iterator>
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struct attribute
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{
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using type = typename mpl::if_c<true, unused_type, char_type>::type;
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};
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private:
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char_type ch;
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public:
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template<class CharParam,
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class Context>
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[[gnu::hot]]
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bool test(CharParam ch, Context &) const
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{
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static_assert(std::is_same<CharParam, char_type>::value);
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#ifndef NDEBUG
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ircd::always_assert(traits::ischar<CharParam, char_encoding>::call(ch));
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#endif
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return this->ch == char_type(ch);
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}
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template<class Context>
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info what(Context &) const
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{
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return info
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{
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"literal-char", char_encoding::toucs4(ch)
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};
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}
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template<class Char>
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literal_char(Char ch)
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:ch(static_cast<char_type>(ch))
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{}
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};
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#endif
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