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424 lines
16 KiB
424 lines
16 KiB
// 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_MSG(false, 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< |
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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<>, true |
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> result_type; |
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template <typename T_> |
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result_type operator()(T_ i, unused_type) const |
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{ |
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return result_type(i); |
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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<bool, Modifiers> |
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: detail::basic_bool_literal<Modifiers> {}; |
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template <typename Modifiers, typename A0> |
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struct make_primitive< |
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terminal_ex<tag::lit, fusion::vector1<A0> > |
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, Modifiers |
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, typename enable_if<traits::is_bool<A0> >::type> |
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: detail::basic_bool_literal<Modifiers> |
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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<>, true |
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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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return result_type(fusion::at_c<0>(term.args)); |
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} |
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}; |
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}}} |
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#endif
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