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Diffstat (limited to 'boost/spirit/home/x3/extensions/seek.hpp')
-rw-r--r-- | boost/spirit/home/x3/extensions/seek.hpp | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/boost/spirit/home/x3/extensions/seek.hpp b/boost/spirit/home/x3/extensions/seek.hpp new file mode 100644 index 0000000000..bcd9544794 --- /dev/null +++ b/boost/spirit/home/x3/extensions/seek.hpp @@ -0,0 +1,70 @@ +/*============================================================================= + Copyright (c) 2011 Jamboree + Copyright (c) 2014 Lee Clagett + + 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_SEEK_APRIL_13_2014_1920PM) +#define BOOST_SPIRIT_X3_SEEK_APRIL_13_2014_1920PM + +#if defined(_MSC_VER) +#pragma once +#endif + +#include <boost/spirit/home/x3/core/parser.hpp> + +namespace boost { namespace spirit { namespace x3 +{ + template<typename Subject> + struct seek_directive : unary_parser<Subject, seek_directive<Subject>> + { + typedef unary_parser<Subject, seek_directive<Subject>> base_type; + static bool const is_pass_through_unary = true; + static bool const handles_container = Subject::handles_container; + + seek_directive(Subject const& subject) : + base_type(subject) {} + + template<typename Iterator, typename Context + , typename RContext, typename Attribute> + bool parse( + Iterator& first, Iterator const& last + , Context const& context, RContext& rcontext, Attribute& attr) const + { + Iterator current(first); + for (/**/; current != last; ++current) + { + if (this->subject.parse(current, last, context, rcontext, attr)) + { + first = current; + return true; + } + } + + // Test for when subjects match on input empty. Example: + // comment = "//" >> seek[eol | eoi] + if (this->subject.parse(current, last, context, rcontext, attr)) + { + first = current; + return true; + } + + return false; + } + }; + + struct seek_gen + { + template<typename Subject> + seek_directive<typename extension::as_parser<Subject>::value_type> + operator[](Subject const& subject) const + { + return {as_parser(subject)}; + } + }; + + seek_gen const seek = seek_gen(); +}}} + +#endif |