Chris@16: //  Copyright (c) 2001-2011 Hartmut Kaiser
Chris@16: //
Chris@16: //  Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #if !defined(BOOST_SPIRIT_KARMA_BOOL_SEP_28_2009_1113AM)
Chris@16: #define BOOST_SPIRIT_KARMA_BOOL_SEP_28_2009_1113AM
Chris@16: 
Chris@16: #if defined(_MSC_VER)
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/limits.hpp>
Chris@16: #include <boost/mpl/bool.hpp>
Chris@16: #include <boost/utility/enable_if.hpp>
Chris@16: 
Chris@16: #include <boost/spirit/home/support/common_terminals.hpp>
Chris@16: #include <boost/spirit/home/support/string_traits.hpp>
Chris@16: #include <boost/spirit/home/support/numeric_traits.hpp>
Chris@16: #include <boost/spirit/home/support/info.hpp>
Chris@16: #include <boost/spirit/home/support/char_class.hpp>
Chris@16: #include <boost/spirit/home/karma/meta_compiler.hpp>
Chris@16: #include <boost/spirit/home/karma/delimit_out.hpp>
Chris@16: #include <boost/spirit/home/karma/auxiliary/lazy.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/get_casetag.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/extract_from.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/enable_lit.hpp>
Chris@16: #include <boost/spirit/home/karma/domain.hpp>
Chris@16: #include <boost/spirit/home/karma/numeric/bool_policies.hpp>
Chris@16: #include <boost/spirit/home/karma/numeric/detail/bool_utils.hpp>
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: namespace boost { namespace spirit
Chris@16: {
Chris@16:     namespace karma
Chris@16:     {
Chris@16:         ///////////////////////////////////////////////////////////////////////
Chris@16:         // forward declaration only
Chris@16:         template <typename T>
Chris@16:         struct bool_policies;
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////
Chris@16:         // This is the class that the user can instantiate directly in
Chris@16:         // order to create a customized bool generator
Chris@16:         template <typename T = bool, typename Policies = bool_policies<T> >
Chris@16:         struct bool_generator
Chris@16:           : spirit::terminal<tag::stateful_tag<Policies, tag::bool_, T> >
Chris@16:         {
Chris@16:             typedef tag::stateful_tag<Policies, tag::bool_, T> tag_type;
Chris@16: 
Chris@16:             bool_generator() {}
Chris@16:             bool_generator(Policies const& data)
Chris@16:               : spirit::terminal<tag_type>(data) {}
Chris@16:         };
Chris@16:     }
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Enablers
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <>
Chris@16:     struct use_terminal<karma::domain, tag::bool_>    // enables bool_
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <>
Chris@16:     struct use_terminal<karma::domain, tag::true_>    // enables true_
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <>
Chris@16:     struct use_terminal<karma::domain, tag::false_>    // enables false_
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <>
Chris@16:     struct use_terminal<karma::domain, bool>          // enables lit(true)
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <typename A0>
Chris@16:     struct use_terminal<karma::domain                 // enables bool_(...)
Chris@16:       , terminal_ex<tag::bool_, fusion::vector1<A0> >
Chris@16:     > : mpl::true_ {};
Chris@16: 
Chris@16:     template <>                                       // enables *lazy* bool_(...)
Chris@16:     struct use_lazy_terminal<karma::domain, tag::bool_, 1>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // enables any custom bool_generator
Chris@16:     template <typename Policies, typename T>
Chris@16:     struct use_terminal<karma::domain
Chris@16:           , tag::stateful_tag<Policies, tag::bool_, T> >
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     // enables any custom bool_generator(...)
Chris@16:     template <typename Policies, typename T, typename A0>
Chris@16:     struct use_terminal<karma::domain
Chris@16:           , terminal_ex<tag::stateful_tag<Policies, tag::bool_, T>
Chris@16:           , fusion::vector1<A0> > >
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     // enables *lazy* custom bool_generator
Chris@16:     template <typename Policies, typename T>
Chris@16:     struct use_lazy_terminal<karma::domain
Chris@16:           , tag::stateful_tag<Policies, tag::bool_, T>, 1>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     // enables lit(bool)
Chris@16:     template <typename A0>
Chris@16:     struct use_terminal<karma::domain
Chris@16:           , terminal_ex<tag::lit, fusion::vector1<A0> >
Chris@16:           , typename enable_if<traits::is_bool<A0> >::type>
Chris@16:       : mpl::true_ {};
Chris@16: }}
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: namespace boost { namespace spirit { namespace karma
Chris@16: {
Chris@16: #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
Chris@16:     using spirit::bool_;
Chris@16:     using spirit::true_;
Chris@16:     using spirit::false_;
Chris@16:     using spirit::lit;    // lit(true) is equivalent to true
Chris@16: #endif
Chris@16: 
Chris@16:     using spirit::bool_type;
Chris@16:     using spirit::true_type;
Chris@16:     using spirit::false_type;
Chris@16:     using spirit::lit_type;
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     //  This specialization is used for bool generators not having a direct
Chris@16:     //  initializer: bool_. These generators must be used in conjunction with
Chris@16:     //  an Attribute.
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename T, typename CharEncoding, typename Tag, typename Policies>
Chris@16:     struct any_bool_generator
Chris@16:       : primitive_generator<any_bool_generator<T, CharEncoding, Tag, Policies> >
Chris@16:     {
Chris@16:     public:
Chris@16:         any_bool_generator(Policies const& p = Policies())
Chris@16:           : p_(p) {}
Chris@16: 
Chris@16:         typedef typename Policies::properties properties;
Chris@16: 
Chris@16:         template <typename Context, typename Unused>
Chris@16:         struct attribute
Chris@16:         {
Chris@16:             typedef T type;
Chris@16:         };
Chris@16: 
Chris@16:         // bool_ has a Attribute attached
Chris@16:         template <typename OutputIterator, typename Context, typename Delimiter
Chris@16:           , typename Attribute>
Chris@16:         bool
Chris@16:         generate(OutputIterator& sink, Context& context, Delimiter const& d
Chris@16:           , Attribute const& attr) const
Chris@16:         {
Chris@16:             if (!traits::has_optional_value(attr))
Chris@16:                 return false;       // fail if it's an uninitialized optional
Chris@16: 
Chris@16:             return bool_inserter<T, Policies, CharEncoding, Tag>::call(
Chris@16:                         sink, traits::extract_from<T>(attr, context), p_) &&
Chris@16:                    delimit_out(sink, d);      // always do post-delimiting
Chris@16:         }
Chris@16: 
Chris@16:         // this bool_ has no Attribute attached, it needs to have been
Chris@16:         // initialized from a direct literal
Chris@16:         template <typename OutputIterator, typename Context, typename Delimiter>
Chris@16:         static bool
Chris@16:         generate(OutputIterator&, Context&, Delimiter const&, unused_type)
Chris@16:         {
Chris@16:             // It is not possible (doesn't make sense) to use boolean generators
Chris@16:             // without providing any attribute, as the generator doesn't 'know'
Chris@16:             // what to output. The following assertion fires if this situation
Chris@16:             // is detected in your code.
Chris@16:             BOOST_SPIRIT_ASSERT_FAIL(OutputIterator, bool_not_usable_without_attribute, ());
Chris@16:             return false;
Chris@16:         }
Chris@16: 
Chris@16:         template <typename Context>
Chris@16:         static info what(Context const& /*context*/)
Chris@16:         {
Chris@16:             return info("bool");
Chris@16:         }
Chris@16: 
Chris@16:         Policies p_;
Chris@16:     };
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     //  This specialization is used for bool generators having a direct
Chris@16:     //  initializer: bool_(true), bool_(0) etc.
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename T, typename CharEncoding, typename Tag
Chris@16:       , typename Policies, bool no_attribute>
Chris@16:     struct literal_bool_generator
Chris@16:       : primitive_generator<literal_bool_generator<T, CharEncoding, Tag
Chris@16:           , Policies, no_attribute> >
Chris@16:     {
Chris@16:     public:
Chris@16:         typedef typename Policies::properties properties;
Chris@16: 
Chris@16:         template <typename Context, typename Unused = unused_type>
Chris@16:         struct attribute
Chris@16:           : mpl::if_c<no_attribute, unused_type, T>
Chris@16:         {};
Chris@16: 
Chris@16:         literal_bool_generator(typename add_const<T>::type n
Chris@16:               , Policies const& p = Policies())
Chris@16:           : n_(n), p_(p) {}
Chris@16: 
Chris@16:         // A bool_() which additionally has an associated attribute emits
Chris@16:         // its immediate literal only if it matches the attribute, otherwise
Chris@16:         // it fails.
Chris@16:         template <typename OutputIterator, typename Context, typename Delimiter
Chris@16:           , typename Attribute>
Chris@16:         bool generate(OutputIterator& sink, Context& context
Chris@16:           , Delimiter const& d, Attribute const& attr) const
Chris@16:         {
Chris@16:             typedef typename attribute<Context>::type attribute_type;
Chris@16:             if (!traits::has_optional_value(attr) ||
Chris@16:                 bool(n_) != bool(traits::extract_from<attribute_type>(attr, context)))
Chris@16:             {
Chris@16:                 return false;
Chris@16:             }
Chris@16:             return bool_inserter<T, Policies, CharEncoding, Tag>::
Chris@16:                       call(sink, n_, p_) && delimit_out(sink, d);
Chris@16:         }
Chris@16: 
Chris@16:         // A bool_() without any associated attribute just emits its
Chris@16:         // immediate literal
Chris@16:         template <typename OutputIterator, typename Context, typename Delimiter>
Chris@16:         bool generate(OutputIterator& sink, Context&, Delimiter const& d
Chris@16:           , unused_type) const
Chris@16:         {
Chris@16:             return bool_inserter<T, Policies, CharEncoding, Tag>::
Chris@16:                       call(sink, n_) && delimit_out(sink, d);
Chris@16:         }
Chris@16: 
Chris@16:         template <typename Context>
Chris@16:         static info what(Context const& /*context*/)
Chris@16:         {
Chris@16:             return info("bool");
Chris@16:         }
Chris@16: 
Chris@16:         T n_;
Chris@16:         Policies p_;
Chris@16:     };
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Generator generators: make_xxx function (objects)
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     namespace detail
Chris@16:     {
Chris@16:         template <typename Modifiers, typename T = bool
Chris@16:           , typename Policies = bool_policies<T> >
Chris@16:         struct make_bool
Chris@16:         {
Chris@16:             static bool const lower =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value;
Chris@16:             static bool const upper =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value;
Chris@16: 
Chris@16:             typedef any_bool_generator<
Chris@16:                 T
Chris@16:               , typename spirit::detail::get_encoding_with_case<
Chris@16:                     Modifiers, unused_type, lower || upper>::type
Chris@16:               , typename detail::get_casetag<Modifiers, lower || upper>::type
Chris@16:               , Policies
Chris@16:             > result_type;
Chris@16: 
Chris@16:             template <typename Terminal>
Chris@16:             result_type operator()(Terminal const& term, unused_type) const
Chris@16:             {
Chris@16:                 typedef tag::stateful_tag<Policies, tag::bool_, T> tag_type;
Chris@16:                 using spirit::detail::get_stateful_data;
Chris@16:                 return result_type(get_stateful_data<tag_type>::call(term));
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         template <typename Modifiers, bool b>
Chris@16:         struct make_bool_literal
Chris@16:         {
Chris@16:             static bool const lower =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value;
Chris@16:             static bool const upper =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value;
Chris@16: 
Chris@16:             typedef literal_bool_generator<
Chris@16:                 bool
Chris@16:               , typename spirit::detail::get_encoding_with_case<
Chris@16:                     Modifiers, unused_type, lower || upper>::type
Chris@16:               , typename detail::get_casetag<Modifiers, lower || upper>::type
Chris@16:               , bool_policies<>, false
Chris@16:             > result_type;
Chris@16: 
Chris@16:             result_type operator()(unused_type, unused_type) const
Chris@16:             {
Chris@16:                 return result_type(b);
Chris@16:             }
Chris@16:         };
Chris@16:     }
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Modifiers>
Chris@16:     struct make_primitive<tag::bool_, Modifiers>
Chris@16:       : detail::make_bool<Modifiers> {};
Chris@16: 
Chris@16:     template <typename Modifiers>
Chris@16:     struct make_primitive<tag::true_, Modifiers>
Chris@16:       : detail::make_bool_literal<Modifiers, true> {};
Chris@16: 
Chris@16:     template <typename Modifiers>
Chris@16:     struct make_primitive<tag::false_, Modifiers>
Chris@16:       : detail::make_bool_literal<Modifiers, false> {};
Chris@16: 
Chris@16:     template <typename T, typename Policies, typename Modifiers>
Chris@16:     struct make_primitive<
Chris@16:             tag::stateful_tag<Policies, tag::bool_, T>, Modifiers>
Chris@16:       : detail::make_bool<Modifiers
Chris@16:           , typename remove_const<T>::type, Policies> {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     namespace detail
Chris@16:     {
Chris@16:         template <typename Modifiers, typename T = bool
Chris@16:           , typename Policies = bool_policies<T> >
Chris@16:         struct make_bool_direct
Chris@16:         {
Chris@16:             static bool const lower =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value;
Chris@16:             static bool const upper =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value;
Chris@16: 
Chris@16:             typedef literal_bool_generator<
Chris@16:                 T
Chris@16:               , typename spirit::detail::get_encoding_with_case<
Chris@16:                     Modifiers, unused_type, lower || upper>::type
Chris@16:               , typename detail::get_casetag<Modifiers, lower || upper>::type
Chris@16:               , Policies, false
Chris@16:             > result_type;
Chris@16: 
Chris@16:             template <typename Terminal>
Chris@16:             result_type operator()(Terminal const& term, unused_type) const
Chris@16:             {
Chris@16:                 typedef tag::stateful_tag<Policies, tag::bool_, T> tag_type;
Chris@16:                 using spirit::detail::get_stateful_data;
Chris@16:                 return result_type(fusion::at_c<0>(term.args)
Chris@16:                   , get_stateful_data<tag_type>::call(term.term));
Chris@16:             }
Chris@16:         };
Chris@16:     }
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:             terminal_ex<tag::bool_, fusion::vector1<A0> >, Modifiers>
Chris@16:       : detail::make_bool_direct<Modifiers> {};
Chris@16: 
Chris@16:     template <typename T, typename Policies, typename A0, typename Modifiers>
Chris@16:     struct make_primitive<
Chris@16:         terminal_ex<tag::stateful_tag<Policies, tag::bool_, T>
Chris@16:           , fusion::vector1<A0> >
Chris@16:           , Modifiers>
Chris@16:       : detail::make_bool_direct<Modifiers
Chris@16:           , typename remove_const<T>::type, Policies> {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     namespace detail
Chris@16:     {
Chris@16:         template <typename Modifiers>
Chris@16:         struct basic_bool_literal
Chris@16:         {
Chris@16:             static bool const lower =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value;
Chris@16:             static bool const upper =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value;
Chris@16: 
Chris@16:             typedef literal_bool_generator<
Chris@16:                 bool
Chris@16:               , typename spirit::detail::get_encoding_with_case<
Chris@16:                     Modifiers, unused_type, lower || upper>::type
Chris@16:               , typename detail::get_casetag<Modifiers, lower || upper>::type
Chris@16:               , bool_policies<>, true
Chris@16:             > result_type;
Chris@16: 
Chris@16:             template <typename T_>
Chris@16:             result_type operator()(T_ i, unused_type) const
Chris@16:             {
Chris@16:                 return result_type(i);
Chris@16:             }
Chris@16:         };
Chris@16:     }
Chris@16: 
Chris@16:     template <typename Modifiers>
Chris@16:     struct make_primitive<bool, Modifiers>
Chris@16:       : detail::basic_bool_literal<Modifiers> {};
Chris@16: 
Chris@16:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:             terminal_ex<tag::lit, fusion::vector1<A0> >
Chris@16:           , Modifiers
Chris@16:           , typename enable_if<traits::is_bool<A0> >::type>
Chris@16:       : detail::basic_bool_literal<Modifiers>
Chris@16:     {
Chris@16:         static bool const lower =
Chris@16:             has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value;
Chris@16:         static bool const upper =
Chris@16:             has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value;
Chris@16: 
Chris@16:         typedef literal_bool_generator<
Chris@16:             bool
Chris@16:           , typename spirit::detail::get_encoding_with_case<
Chris@16:                 Modifiers, unused_type, lower || upper>::type
Chris@16:           , typename detail::get_casetag<Modifiers, lower || upper>::type
Chris@16:           , bool_policies<>, true
Chris@16:         > result_type;
Chris@16: 
Chris@16:         template <typename Terminal>
Chris@16:         result_type operator()(Terminal const& term, unused_type) const
Chris@16:         {
Chris@16:             return result_type(fusion::at_c<0>(term.args));
Chris@16:         }
Chris@16:     };
Chris@16: }}}
Chris@16: 
Chris@16: #endif