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