| /*============================================================================= |
| Copyright (c) 2001-2011 Joel de Guzman |
| Copyright (c) 2001-2011 Hartmut Kaiser |
| |
| 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_REPEAT_NOVEMBER_14_2008_1148AM) |
| #define SPIRIT_REPEAT_NOVEMBER_14_2008_1148AM |
| |
| #if defined(_MSC_VER) |
| #pragma once |
| #endif |
| |
| #include <boost/spirit/home/qi/meta_compiler.hpp> |
| #include <boost/spirit/home/qi/parser.hpp> |
| #include <boost/spirit/home/qi/auxiliary/lazy.hpp> |
| #include <boost/spirit/home/qi/operator/kleene.hpp> |
| #include <boost/spirit/home/support/container.hpp> |
| #include <boost/spirit/home/support/common_terminals.hpp> |
| #include <boost/spirit/home/qi/detail/attributes.hpp> |
| #include <boost/spirit/home/qi/detail/fail_function.hpp> |
| #include <boost/spirit/home/qi/detail/pass_container.hpp> |
| #include <boost/spirit/home/support/info.hpp> |
| #include <boost/spirit/home/support/has_semantic_action.hpp> |
| #include <boost/spirit/home/support/handles_container.hpp> |
| #include <boost/fusion/include/at.hpp> |
| #include <vector> |
| |
| namespace boost { namespace spirit |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| // Enablers |
| /////////////////////////////////////////////////////////////////////////// |
| template <> |
| struct use_directive<qi::domain, tag::repeat> // enables repeat[p] |
| : mpl::true_ {}; |
| |
| template <typename T> |
| struct use_directive<qi::domain |
| , terminal_ex<tag::repeat // enables repeat(exact)[p] |
| , fusion::vector1<T> > |
| > : mpl::true_ {}; |
| |
| template <typename T> |
| struct use_directive<qi::domain |
| , terminal_ex<tag::repeat // enables repeat(min, max)[p] |
| , fusion::vector2<T, T> > |
| > : mpl::true_ {}; |
| |
| template <typename T> |
| struct use_directive<qi::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< |
| qi::domain |
| , tag::repeat |
| , 1 // arity |
| > : mpl::true_ {}; |
| |
| template <> // enables *lazy* repeat(min, max)[p] |
| struct use_lazy_directive< // and repeat(min, inf)[p] |
| qi::domain |
| , tag::repeat |
| , 2 // arity |
| > : mpl::true_ {}; |
| }} |
| |
| namespace boost { namespace spirit { namespace qi |
| { |
| #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS |
| using spirit::repeat; |
| using spirit::inf; |
| #endif |
| using spirit::repeat_type; |
| using spirit::inf_type; |
| |
| template <typename T> |
| struct exact_iterator // handles repeat(exact)[p] |
| { |
| 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&); |
| }; |
| |
| template <typename T> |
| struct finite_iterator // handles repeat(min, max)[p] |
| { |
| 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&); |
| }; |
| |
| template <typename T> |
| struct infinite_iterator // handles repeat(min, inf)[p] |
| { |
| 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> |
| struct repeat_parser : unary_parser<repeat_parser<Subject, LoopIter> > |
| { |
| typedef Subject subject_type; |
| |
| template <typename Context, typename Iterator> |
| struct attribute |
| { |
| // 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. |
| typedef typename |
| traits::build_std_vector< |
| typename traits::attribute_of< |
| Subject, Context, Iterator>::type |
| >::type |
| type; |
| }; |
| |
| repeat_parser(Subject const& subject_, LoopIter const& iter_) |
| : subject(subject_), iter(iter_) {} |
| |
| template <typename F> |
| bool parse_container(F f) const |
| { |
| typename LoopIter::type i = iter.start(); |
| for (/**/; !iter.got_min(i); ++i) |
| { |
| if (f (subject)) |
| return false; |
| } |
| |
| // parse some more up to the maximum specified |
| typename F::iterator_type save = f.f.first; |
| for (/**/; !iter.got_max(i); ++i) |
| { |
| if (f (subject)) |
| break; |
| save = f.f.first; |
| } |
| |
| f.f.first = save; |
| return true; |
| } |
| |
| template <typename Iterator, typename Context |
| , typename Skipper, typename Attribute> |
| bool parse(Iterator& first, Iterator const& last |
| , Context& context, Skipper const& skipper |
| , Attribute& attr_) const |
| { |
| typedef detail::fail_function<Iterator, Context, Skipper> |
| fail_function; |
| |
| // ensure the attribute is actually a container type |
| traits::make_container(attr_); |
| |
| Iterator iter_local = first; |
| fail_function f(iter_local, last, context, skipper); |
| if (!parse_container(detail::make_pass_container(f, attr_))) |
| return false; |
| |
| first = f.first; |
| return true; |
| } |
| |
| template <typename Context> |
| info what(Context& context) const |
| { |
| return info("repeat", subject.what(context)); |
| } |
| |
| Subject subject; |
| LoopIter iter; |
| |
| private: |
| // silence MSVC warning C4512: assignment operator could not be generated |
| repeat_parser& operator= (repeat_parser const&); |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Parser generators: make_xxx function (objects) |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Subject, typename Modifiers> |
| struct make_directive<tag::repeat, Subject, Modifiers> |
| { |
| typedef kleene<Subject> 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 repeat_parser<Subject, iterator_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 repeat_parser<Subject, iterator_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 repeat_parser<Subject, iterator_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<qi::repeat_parser<Subject, LoopIter> > |
| : unary_has_semantic_action<Subject> {}; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Subject, typename LoopIter, typename Attribute |
| , typename Context, typename Iterator> |
| struct handles_container<qi::repeat_parser<Subject, LoopIter> |
| , Attribute, Context, Iterator> |
| : mpl::true_ {}; |
| }}} |
| |
| #endif |
