/*=============================================================================
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Copyright (c) 2009 Hartmut Kaiser
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Copyright (c) 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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#ifndef BOOST_SPIRIT_X3_NUMERIC_BOOL_HPP
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#define BOOST_SPIRIT_X3_NUMERIC_BOOL_HPP
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#include <boost/spirit/home/x3/core/parser.hpp>
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#include <boost/spirit/home/x3/core/skip_over.hpp>
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#include <boost/spirit/home/x3/numeric/bool_policies.hpp>
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namespace boost { namespace spirit { namespace x3
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{
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template <typename T, typename Encoding, typename BoolPolicies = bool_policies<T>>
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struct bool_parser : parser<bool_parser<T, Encoding, BoolPolicies>>
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{
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typedef Encoding encoding;
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typedef T attribute_type;
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static bool const has_attribute = true;
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constexpr bool_parser()
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: policies() {}
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constexpr bool_parser(BoolPolicies const& policies)
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: policies(policies) {}
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template <typename Iterator, typename Context>
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bool parse(Iterator& first, Iterator const& last
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, Context const& context, unused_type, T& attr) const
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{
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x3::skip_over(first, last, context);
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return policies.parse_true(first, last, attr, get_case_compare<encoding>(context))
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|| policies.parse_false(first, last, attr, get_case_compare<encoding>(context));
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}
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template <typename Iterator, typename Context, typename Attribute>
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bool parse(Iterator& first, Iterator const& last
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, Context const& context, unused_type, Attribute& attr_param) const
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{
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// this case is called when Attribute is not T
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T attr_;
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if (parse(first, last, context, unused, attr_))
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{
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traits::move_to(attr_, attr_param);
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return true;
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}
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return false;
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}
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BoolPolicies policies;
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};
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template <typename T, typename Encoding, typename BoolPolicies = bool_policies<T>>
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struct literal_bool_parser : parser<bool_parser<T, Encoding, BoolPolicies>>
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{
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typedef Encoding encoding;
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typedef T attribute_type;
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static bool const has_attribute = true;
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template <typename Value>
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constexpr literal_bool_parser(Value const& n)
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: policies(), n_(n) {}
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template <typename Value>
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constexpr literal_bool_parser(Value const& n, BoolPolicies const& policies)
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: policies(policies), n_(n) {}
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template <typename Iterator, typename Context>
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bool parse_main(Iterator& first, Iterator const& last
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, Context const& context, T& attr) const
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{
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x3::skip_over(first, last, context);
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return (n_ && policies.parse_true(first, last, attr, get_case_compare<encoding>(context)))
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|| (!n_ && policies.parse_false(first, last, attr, get_case_compare<encoding>(context)));
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}
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template <typename Iterator, typename Context>
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bool parse(Iterator& first, Iterator const& last
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, Context const& context, unused_type, T& attr) const
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{
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return parse_main(first, last, context, attr);
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}
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template <typename Iterator, typename Context, typename Attribute>
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bool parse(Iterator& first, Iterator const& last
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, Context const& context, unused_type, Attribute& attr_param) const
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{
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// this case is called when Attribute is not T
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T attr_;
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if (parse_main(first, last, context, attr_))
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{
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traits::move_to(attr_, attr_param);
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return true;
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}
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return false;
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}
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BoolPolicies policies;
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T n_;
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};
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namespace standard
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{
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typedef bool_parser<bool, char_encoding::standard> bool_type;
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constexpr bool_type bool_ = {};
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typedef literal_bool_parser<bool, char_encoding::standard> true_type;
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constexpr true_type true_ = { true };
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typedef literal_bool_parser<bool, char_encoding::standard> false_type;
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constexpr false_type false_ = { false };
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}
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#ifndef BOOST_SPIRIT_NO_STANDARD_WIDE
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namespace standard_wide
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{
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typedef bool_parser<bool, char_encoding::standard_wide> bool_type;
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constexpr bool_type bool_ = {};
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typedef literal_bool_parser<bool, char_encoding::standard_wide> true_type;
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constexpr true_type true_ = { true };
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typedef literal_bool_parser<bool, char_encoding::standard_wide> false_type;
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constexpr false_type false_ = { false };
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}
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#endif
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namespace ascii
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{
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typedef bool_parser<bool, char_encoding::ascii> bool_type;
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constexpr bool_type bool_ = {};
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typedef literal_bool_parser<bool, char_encoding::ascii> true_type;
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constexpr true_type true_ = { true };
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typedef literal_bool_parser<bool, char_encoding::ascii> false_type;
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constexpr false_type false_ = { false };
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}
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namespace iso8859_1
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{
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typedef bool_parser<bool, char_encoding::iso8859_1> bool_type;
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constexpr bool_type bool_ = {};
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typedef literal_bool_parser<bool, char_encoding::iso8859_1> true_type;
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constexpr true_type true_ = { true };
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typedef literal_bool_parser<bool, char_encoding::iso8859_1> false_type;
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constexpr false_type false_ = { false };
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}
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using standard::bool_;
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using standard::true_;
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using standard::false_;
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}}}
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#endif
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