forked from enlightenment/efl
50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
#ifndef EOLIAN_CXX_KLEENE_HH
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#define EOLIAN_CXX_KLEENE_HH
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#include "grammar/generator.hpp"
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namespace efl { namespace eolian { namespace grammar {
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template <typename Generator>
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struct kleene_generator
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{
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kleene_generator(Generator g)
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: generator(g) {}
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template <typename OutputIterator, typename Attribute, typename Context>
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bool generate(OutputIterator sink, Attribute const& attribute, Context const& context) const
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{
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bool b;
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for(auto&& c : attribute)
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{
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b = as_generator(generator).generate(sink, c, context);
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if(!b)
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return false;
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}
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return true;
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}
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Generator generator;
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};
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template <typename Generator>
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struct is_eager_generator<kleene_generator<Generator> > : std::true_type {};
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template <typename Generator>
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struct is_generator<kleene_generator<Generator> > : std::true_type {};
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namespace type_traits {
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template <typename G>
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struct attributes_needed<kleene_generator<G> > : std::integral_constant<int, 1> {};
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}
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template <typename Generator>
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typename std::enable_if<grammar::is_generator<Generator>::value, kleene_generator<Generator>>::type
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operator*(Generator g)
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{
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return kleene_generator<Generator>{g};
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}
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} } }
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#endif
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