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397 lines
13 KiB
397 lines
13 KiB
// Copyright (c) 2001-2011 Hartmut Kaiser |
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// Copyright (c) 2001-2011 Joel de Guzman |
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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(SPIRIT_KARMA_REPEAT_MAY_18_2009_0926AM) |
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#define SPIRIT_KARMA_REPEAT_MAY_18_2009_0926AM |
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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/karma/meta_compiler.hpp> |
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#include <boost/spirit/home/karma/detail/output_iterator.hpp> |
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#include <boost/spirit/home/karma/detail/get_stricttag.hpp> |
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#include <boost/spirit/home/karma/generator.hpp> |
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#include <boost/spirit/home/karma/auxiliary/lazy.hpp> |
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#include <boost/spirit/home/karma/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/support/has_semantic_action.hpp> |
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#include <boost/spirit/home/support/handles_container.hpp> |
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#include <boost/spirit/home/karma/detail/attributes.hpp> |
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#include <boost/spirit/home/support/info.hpp> |
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#include <boost/fusion/include/at.hpp> |
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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<karma::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<karma::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<karma::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<karma::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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karma::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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karma::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 karma |
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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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/////////////////////////////////////////////////////////////////////////// |
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// handles repeat(exact)[p] |
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template <typename T> |
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struct exact_iterator |
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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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// handles repeat(min, max)[p] |
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template <typename T> |
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struct finite_iterator |
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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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// handles repeat(min, inf)[p] |
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template <typename T> |
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struct infinite_iterator |
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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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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject, typename LoopIter, typename Strict |
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, typename Derived> |
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struct base_repeat_generator : unary_generator<Derived> |
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{ |
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private: |
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// iterate over the given container until its exhausted or the embedded |
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// generator succeeds |
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template <typename F, typename Attribute> |
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bool generate_subject(F f, Attribute const&, mpl::false_) const |
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{ |
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// Failing subject generators are just skipped. This allows to |
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// selectively generate items in the provided attribute. |
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while (!f.is_at_end()) |
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{ |
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bool r = !f(subject); |
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if (r) |
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return true; |
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if (!f.is_at_end()) |
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f.next(); |
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} |
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return false; |
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} |
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template <typename F, typename Attribute> |
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bool generate_subject(F f, Attribute const&, mpl::true_) const |
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{ |
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return !f(subject); |
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} |
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// There is no way to distinguish a failed generator from a |
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// generator to be skipped. We assume the user takes responsibility |
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// for ending the loop if no attribute is specified. |
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template <typename F> |
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bool generate_subject(F f, unused_type, mpl::false_) const |
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{ |
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return !f(subject); |
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} |
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public: |
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typedef Subject subject_type; |
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typedef mpl::int_<subject_type::properties::value> properties; |
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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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template <typename Context, typename Iterator> |
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struct attribute |
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: traits::build_std_vector< |
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typename traits::attribute_of<Subject, Context, Iterator>::type |
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> |
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{}; |
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base_repeat_generator(Subject const& subject, LoopIter const& iter) |
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: subject(subject), iter(iter) {} |
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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& ctx, Delimiter const& d |
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, Attribute const& attr) const |
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{ |
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typedef detail::fail_function< |
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OutputIterator, Context, Delimiter |
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> fail_function; |
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typedef typename traits::container_iterator< |
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typename add_const<Attribute>::type |
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>::type iterator_type; |
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typedef |
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typename traits::make_indirect_iterator<iterator_type>::type |
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indirect_iterator_type; |
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typedef detail::pass_container< |
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fail_function, Attribute, indirect_iterator_type, mpl::false_> |
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pass_container; |
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iterator_type it = traits::begin(attr); |
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iterator_type end = traits::end(attr); |
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pass_container pass(fail_function(sink, ctx, d), |
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indirect_iterator_type(it), indirect_iterator_type(end)); |
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// generate the minimal required amount of output |
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typename LoopIter::type i = iter.start(); |
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for (/**/; !pass.is_at_end() && !iter.got_min(i); ++i) |
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{ |
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if (!generate_subject(pass, attr, Strict())) |
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{ |
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// if we fail before reaching the minimum iteration |
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// required, do not output anything and return false |
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return false; |
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} |
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} |
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if (pass.is_at_end() && !iter.got_min(i)) |
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return false; // insufficient attribute elements |
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// generate some more up to the maximum specified |
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for (/**/; !pass.is_at_end() && !iter.got_max(i); ++i) |
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{ |
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if (!generate_subject(pass, attr, Strict())) |
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break; |
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} |
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return detail::sink_is_good(sink); |
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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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}; |
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template <typename Subject, typename LoopIter> |
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struct repeat_generator |
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: base_repeat_generator< |
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Subject, LoopIter, mpl::false_ |
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, repeat_generator<Subject, LoopIter> > |
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{ |
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typedef base_repeat_generator< |
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Subject, LoopIter, mpl::false_, repeat_generator |
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> base_repeat_generator_; |
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repeat_generator(Subject const& subject, LoopIter const& iter) |
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: base_repeat_generator_(subject, iter) {} |
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}; |
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template <typename Subject, typename LoopIter> |
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struct strict_repeat_generator |
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: base_repeat_generator< |
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Subject, LoopIter, mpl::true_ |
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, strict_repeat_generator<Subject, LoopIter> > |
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{ |
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typedef base_repeat_generator< |
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Subject, LoopIter, mpl::true_, strict_repeat_generator |
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> base_repeat_generator_; |
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strict_repeat_generator(Subject const& subject, LoopIter const& iter) |
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: base_repeat_generator_(subject, iter) {} |
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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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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 typename mpl::if_< |
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detail::get_stricttag<Modifiers> |
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, strict_kleene<Subject>, kleene<Subject> |
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>::type result_type; |
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result_type operator()(unused_type, Subject const& subject |
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, 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 typename mpl::if_< |
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detail::get_stricttag<Modifiers> |
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, strict_repeat_generator<Subject, iterator_type> |
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, repeat_generator<Subject, iterator_type> |
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>::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 typename mpl::if_< |
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detail::get_stricttag<Modifiers> |
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, strict_repeat_generator<Subject, iterator_type> |
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, repeat_generator<Subject, iterator_type> |
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>::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 typename mpl::if_< |
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detail::get_stricttag<Modifiers> |
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, strict_repeat_generator<Subject, iterator_type> |
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, repeat_generator<Subject, iterator_type> |
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>::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<karma::repeat_generator<Subject, LoopIter> > |
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: unary_has_semantic_action<Subject> {}; |
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template <typename Subject, typename LoopIter> |
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struct has_semantic_action<karma::strict_repeat_generator<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< |
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karma::repeat_generator<Subject, LoopIter>, Attribute |
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, Context, Iterator> |
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: mpl::true_ {}; |
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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< |
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karma::strict_repeat_generator<Subject, LoopIter>, Attribute |
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, Context, Iterator> |
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: mpl::true_ {}; |
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}}} |
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#endif
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