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/*=============================================================================
Copyright (c) 2009 Hartmut Kaiser
Copyright (c) 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_X3_BOOL_SEP_29_2009_0709AM)
#define SPIRIT_X3_BOOL_SEP_29_2009_0709AM
#include <boost/spirit/home/x3/core/parser.hpp>
#include <boost/spirit/home/x3/core/skip_over.hpp>
#include <boost/spirit/home/x3/numeric/bool_policies.hpp>
namespace boost { namespace spirit { namespace x3
{
template <typename T, typename BoolPolicies = bool_policies<T>>
struct bool_parser : parser<bool_parser<T, BoolPolicies>>
{
typedef T attribute_type;
static bool const has_attribute = true;
bool_parser()
: policies() {}
bool_parser(BoolPolicies const& policies)
: policies(policies) {}
template <typename Iterator, typename Context>
bool parse(Iterator& first, Iterator const& last
, Context& context, unused_type, T& attr) const
{
x3::skip_over(first, last, context);
return policies.parse_true(first, last, attr)
|| policies.parse_false(first, last, attr);
}
template <typename Iterator, typename Context, typename Attribute>
bool parse(Iterator& first, Iterator const& last
, Context& context, unused_type, Attribute& attr_param) const
{
// this case is called when Attribute is not T
T attr_;
if (parse(first, last, context, unused, attr_))
{
traits::move_to(attr_, attr_param);
return true;
}
return false;
}
BoolPolicies policies;
};
template <typename T, typename BoolPolicies = bool_policies<T>>
struct literal_bool_parser : parser<bool_parser<T, BoolPolicies>>
{
typedef T attribute_type;
static bool const has_attribute = true;
template <typename Value>
literal_bool_parser(Value const& n)
: policies(), n_(n) {}
template <typename Value>
literal_bool_parser(Value const& n, BoolPolicies const& policies)
: policies(policies), n_(n) {}
template <typename Iterator, typename Context>
bool parse(Iterator& first, Iterator const& last
, Context& context, unused_type, T& attr) const
{
x3::skip_over(first, last, context);
return (n_ && policies.parse_true(first, last, attr))
|| (!n_ && policies.parse_false(first, last, attr));
}
template <typename Iterator, typename Context, typename Attribute>
bool parse(Iterator& first, Iterator const& last
, Context& context, unused_type, Attribute& attr_param) const
{
// this case is called when Attribute is not T
T attr_;
if (parse(first, last, context, unused, attr_))
{
traits::move_to(attr_, attr_param);
return true;
}
return false;
}
BoolPolicies policies;
T n_;
};
typedef bool_parser<bool> bool_type;
bool_type const bool_ = {};
typedef literal_bool_parser<bool> true_type;
true_type const true_ = { true };
typedef literal_bool_parser<bool> false_type;
false_type const false_ = { false };
}}}
#endif
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