| // Copyright (c) 2001-2011 Hartmut Kaiser | |
| // Copyright (c) 2001-2011 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_KARMA_REPEAT_MAY_18_2009_0926AM) | |
| #define SPIRIT_KARMA_REPEAT_MAY_18_2009_0926AM | |
| #if defined(_MSC_VER) | |
| #pragma once | |
| #endif | |
| #include <boost/spirit/home/karma/meta_compiler.hpp> | |
| #include <boost/spirit/home/karma/detail/output_iterator.hpp> | |
| #include <boost/spirit/home/karma/detail/get_stricttag.hpp> | |
| #include <boost/spirit/home/karma/generator.hpp> | |
| #include <boost/spirit/home/karma/auxiliary/lazy.hpp> | |
| #include <boost/spirit/home/karma/operator/kleene.hpp> | |
| #include <boost/spirit/home/support/container.hpp> | |
| #include <boost/spirit/home/support/common_terminals.hpp> | |
| #include <boost/spirit/home/support/has_semantic_action.hpp> | |
| #include <boost/spirit/home/support/handles_container.hpp> | |
| #include <boost/spirit/home/karma/detail/attributes.hpp> | |
| #include <boost/spirit/home/support/info.hpp> | |
| #include <boost/fusion/include/at.hpp> | |
| namespace boost { namespace spirit | |
| { | |
| /////////////////////////////////////////////////////////////////////////// | |
| // Enablers | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <> | |
| struct use_directive<karma::domain, tag::repeat> // enables repeat[p] | |
| : mpl::true_ {}; | |
| template <typename T> | |
| struct use_directive<karma::domain | |
| , terminal_ex<tag::repeat // enables repeat(exact)[p] | |
| , fusion::vector1<T> > | |
| > : mpl::true_ {}; | |
| template <typename T> | |
| struct use_directive<karma::domain | |
| , terminal_ex<tag::repeat // enables repeat(min, max)[p] | |
| , fusion::vector2<T, T> > | |
| > : mpl::true_ {}; | |
| template <typename T> | |
| struct use_directive<karma::domain | |
| , terminal_ex<tag::repeat // enables repeat(min, inf)[p] | |
| , fusion::vector2<T, inf_type> > | |
| > : mpl::true_ {}; | |
| template <> // enables *lazy* repeat(exact)[p] | |
| struct use_lazy_directive< | |
| karma::domain | |
| , tag::repeat | |
| , 1 // arity | |
| > : mpl::true_ {}; | |
| template <> // enables *lazy* repeat(min, max)[p] | |
| struct use_lazy_directive< // and repeat(min, inf)[p] | |
| karma::domain | |
| , tag::repeat | |
| , 2 // arity | |
| > : mpl::true_ {}; | |
| }} | |
| namespace boost { namespace spirit { namespace karma | |
| { | |
| using spirit::repeat; | |
| using spirit::repeat_type; | |
| using spirit::inf; | |
| using spirit::inf_type; | |
| /////////////////////////////////////////////////////////////////////////// | |
| // handles repeat(exact)[p] | |
| template <typename T> | |
| struct exact_iterator | |
| { | |
| exact_iterator(T const exact) | |
| : exact(exact) {} | |
| typedef T type; | |
| T start() const { return 0; } | |
| bool got_max(T i) const { return i >= exact; } | |
| bool got_min(T i) const { return i >= exact; } | |
| T const exact; | |
| private: | |
| // silence MSVC warning C4512: assignment operator could not be generated | |
| exact_iterator& operator= (exact_iterator const&); | |
| }; | |
| // handles repeat(min, max)[p] | |
| template <typename T> | |
| struct finite_iterator | |
| { | |
| finite_iterator(T const min, T const max) | |
| : min BOOST_PREVENT_MACRO_SUBSTITUTION (min) | |
| , max BOOST_PREVENT_MACRO_SUBSTITUTION (max) {} | |
| typedef T type; | |
| T start() const { return 0; } | |
| bool got_max(T i) const { return i >= max; } | |
| bool got_min(T i) const { return i >= min; } | |
| T const min; | |
| T const max; | |
| private: | |
| // silence MSVC warning C4512: assignment operator could not be generated | |
| finite_iterator& operator= (finite_iterator const&); | |
| }; | |
| // handles repeat(min, inf)[p] | |
| template <typename T> | |
| struct infinite_iterator | |
| { | |
| infinite_iterator(T const min) | |
| : min BOOST_PREVENT_MACRO_SUBSTITUTION (min) {} | |
| typedef T type; | |
| T start() const { return 0; } | |
| bool got_max(T /*i*/) const { return false; } | |
| bool got_min(T i) const { return i >= min; } | |
| T const min; | |
| private: | |
| // silence MSVC warning C4512: assignment operator could not be generated | |
| infinite_iterator& operator= (infinite_iterator const&); | |
| }; | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename Subject, typename LoopIter, typename Strict | |
| , typename Derived> | |
| struct base_repeat_generator : unary_generator<Derived> | |
| { | |
| private: | |
| // iterate over the given container until its exhausted or the embedded | |
| // (left) generator succeeds | |
| template < | |
| typename OutputIterator, typename Context, typename Delimiter | |
| , typename Iterator, typename Attribute> | |
| bool generate_subject(OutputIterator& sink, Context& ctx | |
| , Delimiter const& d, Iterator& it, Iterator& end, Attribute const&) const | |
| { | |
| // Failing subject generators are just skipped. This allows to | |
| // selectively generate items in the provided attribute. | |
| while (!traits::compare(it, end)) | |
| { | |
| if (subject.generate(sink, ctx, d, traits::deref(it))) | |
| return true; | |
| if (Strict::value) | |
| return false; | |
| traits::next(it); | |
| } | |
| return false; | |
| } | |
| template < | |
| typename OutputIterator, typename Context, typename Delimiter | |
| , typename Iterator> | |
| bool generate_subject(OutputIterator& sink, Context& ctx | |
| , Delimiter const& d, Iterator&, Iterator&, unused_type) const | |
| { | |
| // There is no way to distinguish a failed generator from a | |
| // generator to be skipped. We assume the user takes responsibility | |
| // for ending the loop if no attribute is specified. | |
| return subject.generate(sink, ctx, d, unused); | |
| } | |
| public: | |
| typedef Subject subject_type; | |
| typedef mpl::int_<subject_type::properties::value> properties; | |
| // Build a std::vector from the subject's attribute. Note | |
| // that build_std_vector may return unused_type if the | |
| // subject's attribute is an unused_type. | |
| template <typename Context, typename Iterator> | |
| struct attribute | |
| : traits::build_std_vector< | |
| typename traits::attribute_of<Subject, Context, Iterator>::type | |
| > | |
| {}; | |
| base_repeat_generator(Subject const& subject, LoopIter const& iter) | |
| : subject(subject), iter(iter) {} | |
| template <typename OutputIterator, typename Context, typename Delimiter | |
| , typename Attribute> | |
| bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d | |
| , Attribute const& attr) const | |
| { | |
| typedef typename traits::container_iterator< | |
| typename add_const<Attribute>::type | |
| >::type iterator_type; | |
| iterator_type it = traits::begin(attr); | |
| iterator_type end = traits::end(attr); | |
| typename LoopIter::type i = iter.start(); | |
| // generate the minimal required amount of output | |
| for (/**/; !iter.got_min(i); ++i, traits::next(it)) | |
| { | |
| if (!generate_subject(sink, ctx, d, it, end, attr)) | |
| { | |
| // if we fail before reaching the minimum iteration | |
| // required, do not output anything and return false | |
| return false; | |
| } | |
| } | |
| // generate some more up to the maximum specified | |
| for (/**/; detail::sink_is_good(sink) && !iter.got_max(i); | |
| ++i, traits::next(it)) | |
| { | |
| if (!generate_subject(sink, ctx, d, it, end, attr)) | |
| break; | |
| } | |
| return detail::sink_is_good(sink); | |
| } | |
| template <typename Context> | |
| info what(Context& context) const | |
| { | |
| return info("repeat", subject.what(context)); | |
| } | |
| Subject subject; | |
| LoopIter iter; | |
| }; | |
| template <typename Subject, typename LoopIter> | |
| struct repeat_generator | |
| : base_repeat_generator< | |
| Subject, LoopIter, mpl::false_ | |
| , repeat_generator<Subject, LoopIter> > | |
| { | |
| typedef base_repeat_generator< | |
| Subject, LoopIter, mpl::false_, repeat_generator | |
| > base_repeat_generator_; | |
| repeat_generator(Subject const& subject, LoopIter const& iter) | |
| : base_repeat_generator_(subject, iter) {} | |
| }; | |
| template <typename Subject, typename LoopIter> | |
| struct strict_repeat_generator | |
| : base_repeat_generator< | |
| Subject, LoopIter, mpl::true_ | |
| , strict_repeat_generator<Subject, LoopIter> > | |
| { | |
| typedef base_repeat_generator< | |
| Subject, LoopIter, mpl::true_, strict_repeat_generator | |
| > base_repeat_generator_; | |
| strict_repeat_generator(Subject const& subject, LoopIter const& iter) | |
| : base_repeat_generator_(subject, iter) {} | |
| }; | |
| /////////////////////////////////////////////////////////////////////////// | |
| // Generator generators: make_xxx function (objects) | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename Subject, typename Modifiers> | |
| struct make_directive<tag::repeat, Subject, Modifiers> | |
| { | |
| typedef typename mpl::if_< | |
| detail::get_stricttag<Modifiers> | |
| , strict_kleene<Subject>, kleene<Subject> | |
| >::type result_type; | |
| result_type operator()(unused_type, Subject const& subject | |
| , unused_type) const | |
| { | |
| return result_type(subject); | |
| } | |
| }; | |
| template <typename T, typename Subject, typename Modifiers> | |
| struct make_directive< | |
| terminal_ex<tag::repeat, fusion::vector1<T> >, Subject, Modifiers> | |
| { | |
| typedef exact_iterator<T> iterator_type; | |
| typedef typename mpl::if_< | |
| detail::get_stricttag<Modifiers> | |
| , strict_repeat_generator<Subject, iterator_type> | |
| , repeat_generator<Subject, iterator_type> | |
| >::type result_type; | |
| template <typename Terminal> | |
| result_type operator()( | |
| Terminal const& term, Subject const& subject, unused_type) const | |
| { | |
| return result_type(subject, fusion::at_c<0>(term.args)); | |
| } | |
| }; | |
| template <typename T, typename Subject, typename Modifiers> | |
| struct make_directive< | |
| terminal_ex<tag::repeat, fusion::vector2<T, T> >, Subject, Modifiers> | |
| { | |
| typedef finite_iterator<T> iterator_type; | |
| typedef typename mpl::if_< | |
| detail::get_stricttag<Modifiers> | |
| , strict_repeat_generator<Subject, iterator_type> | |
| , repeat_generator<Subject, iterator_type> | |
| >::type result_type; | |
| template <typename Terminal> | |
| result_type operator()( | |
| Terminal const& term, Subject const& subject, unused_type) const | |
| { | |
| return result_type(subject, | |
| iterator_type( | |
| fusion::at_c<0>(term.args) | |
| , fusion::at_c<1>(term.args) | |
| ) | |
| ); | |
| } | |
| }; | |
| template <typename T, typename Subject, typename Modifiers> | |
| struct make_directive< | |
| terminal_ex<tag::repeat | |
| , fusion::vector2<T, inf_type> >, Subject, Modifiers> | |
| { | |
| typedef infinite_iterator<T> iterator_type; | |
| typedef typename mpl::if_< | |
| detail::get_stricttag<Modifiers> | |
| , strict_repeat_generator<Subject, iterator_type> | |
| , repeat_generator<Subject, iterator_type> | |
| >::type result_type; | |
| template <typename Terminal> | |
| result_type operator()( | |
| Terminal const& term, Subject const& subject, unused_type) const | |
| { | |
| return result_type(subject, fusion::at_c<0>(term.args)); | |
| } | |
| }; | |
| }}} | |
| namespace boost { namespace spirit { namespace traits | |
| { | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename Subject, typename LoopIter> | |
| struct has_semantic_action<karma::repeat_generator<Subject, LoopIter> > | |
| : unary_has_semantic_action<Subject> {}; | |
| template <typename Subject, typename LoopIter> | |
| struct has_semantic_action<karma::strict_repeat_generator<Subject, LoopIter> > | |
| : unary_has_semantic_action<Subject> {}; | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename Subject, typename LoopIter, typename Attribute | |
| , typename Context, typename Iterator> | |
| struct handles_container< | |
| karma::repeat_generator<Subject, LoopIter>, Attribute | |
| , Context, Iterator> | |
| : mpl::true_ {}; | |
| template <typename Subject, typename LoopIter, typename Attribute | |
| , typename Context, typename Iterator> | |
| struct handles_container< | |
| karma::strict_repeat_generator<Subject, LoopIter>, Attribute | |
| , Context, Iterator> | |
| : mpl::true_ {}; | |
| }}} | |
| #endif |