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Diffstat (limited to 'boost/spirit/home/x3/operator/alternative.hpp')
-rw-r--r-- | boost/spirit/home/x3/operator/alternative.hpp | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/boost/spirit/home/x3/operator/alternative.hpp b/boost/spirit/home/x3/operator/alternative.hpp new file mode 100644 index 0000000000..1566780bc6 --- /dev/null +++ b/boost/spirit/home/x3/operator/alternative.hpp @@ -0,0 +1,68 @@ +/*============================================================================= + 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(SPIRIT_ALTERNATIVE_JAN_07_2013_1131AM) +#define SPIRIT_ALTERNATIVE_JAN_07_2013_1131AM + +#if defined(_MSC_VER) +#pragma once +#endif + +#include <boost/spirit/home/x3/support/traits/attribute_of.hpp> +#include <boost/spirit/home/x3/core/parser.hpp> +#include <boost/spirit/home/x3/operator/detail/alternative.hpp> + +namespace boost { namespace spirit { namespace x3 +{ + template <typename Left, typename Right> + struct alternative : binary_parser<Left, Right, alternative<Left, Right>> + { + typedef binary_parser<Left, Right, alternative<Left, Right>> base_type; + + alternative(Left left, Right right) + : base_type(left, right) {} + + template <typename Iterator, typename Context, typename RContext> + bool parse( + Iterator& first, Iterator const& last + , Context const& context, RContext& rcontext, unused_type) const + { + return this->left.parse(first, last, context, rcontext, unused) + || this->right.parse(first, last, context, rcontext, unused); + } + + template <typename Iterator, typename Context + , typename RContext, typename Attribute> + bool parse( + Iterator& first, Iterator const& last + , Context const& context, RContext& rcontext, Attribute& attr) const + { + if (detail::parse_alternative(this->left, first, last, context, rcontext, attr)) + return true; + if (detail::parse_alternative(this->right, first, last, context, rcontext, attr)) + return true; + return false; + } + }; + + template <typename Left, typename Right> + inline alternative< + typename extension::as_parser<Left>::value_type + , typename extension::as_parser<Right>::value_type> + operator|(Left const& left, Right const& right) + { + return {as_parser(left), as_parser(right)}; + } +}}} + +namespace boost { namespace spirit { namespace x3 { namespace traits +{ + template <typename Left, typename Right, typename Context> + struct attribute_of<x3::alternative<Left, Right>, Context> + : x3::detail::attribute_of_alternative<Left, Right, Context> {}; +}}}} + +#endif |