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297 lines
9.8 KiB
297 lines
9.8 KiB
/*============================================================================= |
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Copyright (c) 2001-2011 Joel de Guzman |
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Copyright (c) 2001-2011 Hartmut Kaiser |
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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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=============================================================================*/ |
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#if !defined(SPIRIT_REPEAT_NOVEMBER_14_2008_1148AM) |
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#define SPIRIT_REPEAT_NOVEMBER_14_2008_1148AM |
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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/spirit/home/qi/meta_compiler.hpp> |
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#include <boost/spirit/home/qi/parser.hpp> |
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#include <boost/spirit/home/qi/auxiliary/lazy.hpp> |
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#include <boost/spirit/home/qi/operator/kleene.hpp> |
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#include <boost/spirit/home/support/container.hpp> |
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#include <boost/spirit/home/support/common_terminals.hpp> |
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#include <boost/spirit/home/qi/detail/attributes.hpp> |
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#include <boost/spirit/home/qi/detail/fail_function.hpp> |
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#include <boost/spirit/home/qi/detail/pass_container.hpp> |
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#include <boost/spirit/home/support/info.hpp> |
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#include <boost/spirit/home/support/has_semantic_action.hpp> |
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#include <boost/spirit/home/support/handles_container.hpp> |
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#include <boost/fusion/include/at.hpp> |
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#include <vector> |
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namespace boost { namespace spirit |
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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_directive<qi::domain, tag::repeat> // enables repeat[p] |
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: mpl::true_ {}; |
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template <typename T> |
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struct use_directive<qi::domain |
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, terminal_ex<tag::repeat // enables repeat(exact)[p] |
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, fusion::vector1<T> > |
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> : mpl::true_ {}; |
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template <typename T> |
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struct use_directive<qi::domain |
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, terminal_ex<tag::repeat // enables repeat(min, max)[p] |
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, fusion::vector2<T, T> > |
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> : mpl::true_ {}; |
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template <typename T> |
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struct use_directive<qi::domain |
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, terminal_ex<tag::repeat // enables repeat(min, inf)[p] |
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, fusion::vector2<T, inf_type> > |
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> : mpl::true_ {}; |
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template <> // enables *lazy* repeat(exact)[p] |
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struct use_lazy_directive< |
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qi::domain |
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, tag::repeat |
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, 1 // arity |
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> : mpl::true_ {}; |
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template <> // enables *lazy* repeat(min, max)[p] |
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struct use_lazy_directive< // and repeat(min, inf)[p] |
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qi::domain |
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, tag::repeat |
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, 2 // arity |
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> : mpl::true_ {}; |
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}} |
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namespace boost { namespace spirit { namespace qi |
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{ |
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#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS |
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using spirit::repeat; |
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using spirit::inf; |
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#endif |
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using spirit::repeat_type; |
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using spirit::inf_type; |
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template <typename T> |
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struct exact_iterator // handles repeat(exact)[p] |
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{ |
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exact_iterator(T const exact) |
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: exact(exact) {} |
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typedef T type; |
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T start() const { return 0; } |
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bool got_max(T i) const { return i >= exact; } |
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bool got_min(T i) const { return i >= exact; } |
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T const exact; |
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private: |
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// silence MSVC warning C4512: assignment operator could not be generated |
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exact_iterator& operator= (exact_iterator const&); |
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}; |
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template <typename T> |
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struct finite_iterator // handles repeat(min, max)[p] |
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{ |
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finite_iterator(T const min, T const max) |
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: min BOOST_PREVENT_MACRO_SUBSTITUTION (min) |
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, max BOOST_PREVENT_MACRO_SUBSTITUTION (max) {} |
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typedef T type; |
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T start() const { return 0; } |
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bool got_max(T i) const { return i >= max; } |
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bool got_min(T i) const { return i >= min; } |
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T const min; |
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T const max; |
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private: |
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// silence MSVC warning C4512: assignment operator could not be generated |
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finite_iterator& operator= (finite_iterator const&); |
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}; |
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template <typename T> |
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struct infinite_iterator // handles repeat(min, inf)[p] |
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{ |
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infinite_iterator(T const min) |
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: min BOOST_PREVENT_MACRO_SUBSTITUTION (min) {} |
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typedef T type; |
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T start() const { return 0; } |
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bool got_max(T /*i*/) const { return false; } |
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bool got_min(T i) const { return i >= min; } |
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T const min; |
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private: |
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// silence MSVC warning C4512: assignment operator could not be generated |
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infinite_iterator& operator= (infinite_iterator const&); |
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}; |
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template <typename Subject, typename LoopIter> |
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struct repeat_parser : unary_parser<repeat_parser<Subject, LoopIter> > |
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{ |
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typedef Subject subject_type; |
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template <typename Context, typename Iterator> |
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struct attribute |
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{ |
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// Build a std::vector from the subject's attribute. Note |
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// that build_std_vector may return unused_type if the |
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// subject's attribute is an unused_type. |
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typedef typename |
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traits::build_std_vector< |
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typename traits::attribute_of< |
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Subject, Context, Iterator>::type |
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>::type |
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type; |
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}; |
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repeat_parser(Subject const& subject, LoopIter const& iter) |
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: subject(subject), iter(iter) {} |
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template <typename F> |
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bool parse_container(F f) const |
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{ |
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typename LoopIter::type i = iter.start(); |
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for (/**/; !iter.got_min(i); ++i) |
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{ |
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if (f (subject)) |
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return false; |
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} |
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// parse some more up to the maximum specified |
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typename F::iterator_type save = f.f.first; |
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for (/**/; !iter.got_max(i); ++i) |
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{ |
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if (f (subject)) |
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break; |
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save = f.f.first; |
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} |
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f.f.first = save; |
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return true; |
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} |
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template <typename Iterator, typename Context |
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, typename Skipper, typename Attribute> |
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bool parse(Iterator& first, Iterator const& last |
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, Context& context, Skipper const& skipper |
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, Attribute& attr) const |
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{ |
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typedef detail::fail_function<Iterator, Context, Skipper> |
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fail_function; |
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// ensure the attribute is actually a container type |
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traits::make_container(attr); |
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Iterator iter = first; |
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fail_function f(iter, last, context, skipper); |
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if (!parse_container(detail::make_pass_container(f, attr))) |
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return false; |
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first = f.first; |
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return true; |
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} |
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template <typename Context> |
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info what(Context& context) const |
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{ |
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return info("repeat", subject.what(context)); |
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} |
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Subject subject; |
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LoopIter iter; |
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private: |
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// silence MSVC warning C4512: assignment operator could not be generated |
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repeat_parser& operator= (repeat_parser const&); |
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}; |
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/////////////////////////////////////////////////////////////////////////// |
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// Parser generators: make_xxx function (objects) |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject, typename Modifiers> |
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struct make_directive<tag::repeat, Subject, Modifiers> |
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{ |
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typedef kleene<Subject> result_type; |
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result_type operator()(unused_type, Subject const& subject, unused_type) const |
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{ |
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return result_type(subject); |
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} |
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}; |
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template <typename T, typename Subject, typename Modifiers> |
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struct make_directive< |
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terminal_ex<tag::repeat, fusion::vector1<T> >, Subject, Modifiers> |
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{ |
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typedef exact_iterator<T> iterator_type; |
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typedef repeat_parser<Subject, iterator_type> result_type; |
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template <typename Terminal> |
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result_type operator()( |
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Terminal const& term, Subject const& subject, unused_type) const |
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{ |
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return result_type(subject, fusion::at_c<0>(term.args)); |
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} |
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}; |
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template <typename T, typename Subject, typename Modifiers> |
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struct make_directive< |
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terminal_ex<tag::repeat, fusion::vector2<T, T> >, Subject, Modifiers> |
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{ |
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typedef finite_iterator<T> iterator_type; |
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typedef repeat_parser<Subject, iterator_type> result_type; |
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template <typename Terminal> |
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result_type operator()( |
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Terminal const& term, Subject const& subject, unused_type) const |
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{ |
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return result_type(subject, |
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iterator_type( |
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fusion::at_c<0>(term.args) |
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, fusion::at_c<1>(term.args) |
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) |
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); |
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} |
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}; |
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template <typename T, typename Subject, typename Modifiers> |
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struct make_directive< |
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terminal_ex<tag::repeat |
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, fusion::vector2<T, inf_type> >, Subject, Modifiers> |
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{ |
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typedef infinite_iterator<T> iterator_type; |
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typedef repeat_parser<Subject, iterator_type> result_type; |
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template <typename Terminal> |
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result_type operator()( |
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Terminal const& term, Subject const& subject, unused_type) const |
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{ |
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return result_type(subject, fusion::at_c<0>(term.args)); |
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} |
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}; |
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}}} |
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namespace boost { namespace spirit { namespace traits |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject, typename LoopIter> |
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struct has_semantic_action<qi::repeat_parser<Subject, LoopIter> > |
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: unary_has_semantic_action<Subject> {}; |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject, typename LoopIter, typename Attribute |
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, typename Context, typename Iterator> |
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struct handles_container<qi::repeat_parser<Subject, LoopIter> |
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, Attribute, Context, Iterator> |
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: mpl::true_ {}; |
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}}} |
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#endif
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