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Diffstat (limited to 'boost/spirit/home/x3/char/char_set.hpp')
-rw-r--r-- | boost/spirit/home/x3/char/char_set.hpp | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/boost/spirit/home/x3/char/char_set.hpp b/boost/spirit/home/x3/char/char_set.hpp new file mode 100644 index 0000000000..5a37ff6bea --- /dev/null +++ b/boost/spirit/home/x3/char/char_set.hpp @@ -0,0 +1,136 @@ +/*============================================================================= + 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_CHAR_SET_OCT_12_2014_1051AM) +#define BOOST_SPIRIT_X3_CHAR_SET_OCT_12_2014_1051AM + +#include <boost/spirit/home/x3/char/char_parser.hpp> +#include <boost/spirit/home/x3/char/detail/cast_char.hpp> +#include <boost/spirit/home/x3/support/traits/string_traits.hpp> +#include <boost/spirit/home/x3/support/utility/utf8.hpp> +#include <boost/spirit/home/x3/support/no_case.hpp> +#include <boost/spirit/home/support/char_set/basic_chset.hpp> + +#include <boost/type_traits/is_same.hpp> + +namespace boost { namespace spirit { namespace x3 +{ + /////////////////////////////////////////////////////////////////////////// + // Parser for a character range + /////////////////////////////////////////////////////////////////////////// + template <typename Encoding, typename Attribute = typename Encoding::char_type> + struct char_range + : char_parser< char_range<Encoding, Attribute> > + { + + typedef typename Encoding::char_type char_type; + typedef Encoding encoding; + typedef Attribute attribute_type; + static bool const has_attribute = + !is_same<unused_type, attribute_type>::value; + + + char_range(char_type from_, char_type to_) + : from(from_), to(to_) {} + + template <typename Char, typename Context> + bool test(Char ch_, Context& context) const + { + + char_type ch = char_type(ch_); // optimize for token based parsing + return ((sizeof(Char) <= sizeof(char_type)) || encoding::ischar(ch_)) + && (get_case_compare<encoding>(context)(ch, from) > 0 ) + && (get_case_compare<encoding>(context)(ch , to) < 0 ); + } + + char_type from, to; + }; + + + /////////////////////////////////////////////////////////////////////////// + // Parser for a character set + /////////////////////////////////////////////////////////////////////////// + template <typename Encoding, typename Attribute = typename Encoding::char_type> + struct char_set : char_parser<char_set<Encoding, Attribute>> + { + typedef typename Encoding::char_type char_type; + typedef Encoding encoding; + typedef Attribute attribute_type; + static bool const has_attribute = + !is_same<unused_type, attribute_type>::value; + + template <typename String> + char_set(String const& str) + { + using spirit::x3::detail::cast_char; + + typedef typename + remove_const< + typename traits::char_type_of<String>::type + >::type + in_type; + + in_type const* definition = + (in_type const*)traits::get_c_string(str); + in_type ch = *definition++; + while (ch) + { + in_type next = *definition++; + if (next == '-') + { + next = *definition++; + if (next == 0) + { + chset.set(cast_char<char_type>(ch)); + chset.set('-'); + break; + } + chset.set( + cast_char<char_type>(ch), + cast_char<char_type>(next) + ); + } + else + { + chset.set(cast_char<char_type>(ch)); + } + ch = next; + } + } + + template <typename Char, typename Context> + bool test(Char ch_, Context const& context) const + { + return ((sizeof(Char) <= sizeof(char_type)) || encoding::ischar(ch_)) + && get_case_compare<encoding>(context).in_set(ch_,chset); + } + + support::detail::basic_chset<char_type> chset; + }; + + template <typename Encoding, typename Attribute> + struct get_info<char_set<Encoding, Attribute>> + { + typedef std::string result_type; + std::string operator()(char_set<Encoding, Attribute> const& p) const + { + return "char-set"; + } + }; + + template <typename Encoding, typename Attribute> + struct get_info<char_range<Encoding, Attribute>> + { + typedef std::string result_type; + std::string operator()(char_range<Encoding, Attribute> const& p) const + { + return "char_range \"" + to_utf8(Encoding::toucs4(p.from)) + '-' + to_utf8(Encoding::toucs4(p.to))+ '"'; + } + }; + +}}} + +#endif |