StackOverflow2013

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18391326
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0
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0
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2
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2013-08-22T21:42:20.680
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2013-08-23T12:02:16.103
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2013-08-23T12:02:16.103
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85371
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85371
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18377380
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2
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3
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text
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Fully working demo: <a href="http://coliru.stacked-crooked.com/view?id=a5d6bd0dfd0fd832103f5165dac13ead-f468fd186ebe6d5f25efae86bd4f0130" rel="nofollow">live on Coliru</a> What this adds over a naive approach is that <code>raw</code> values are optionally ended at <code>]</code> if the state is <code>in_group</code>. I elected pass the state using an inherited attribute (<code>bool</code>). This implementation allows nested sub-groups as well, e.g.: <code>"[w1/[w2/w3]2/w4]3"</code> <pre><code>#define BOOST_SPIRIT_DEBUG #include <boost/spirit/include/qi.hpp> #include <boost/spirit/include/phoenix.hpp> namespace phx = boost::phoenix; int main() { typedef std::string::const_iterator It; const std::string input = "[w1/[w2/w3]2/w4]3"; std::vector<std::string> v; It first(input.begin()), last(input.end()); using namespace boost::spirit::qi; rule<It, std::string(bool in_group)> raw; rule<It, std::vector<std::string>(bool in_group), space_type> group, delimited; _r1_type in_group; // friendly alias for the inherited attribute raw = eps(in_group) >> +~char_("/]") | +~char_("/"); delimited = (group(in_group)|raw(in_group)) % '/'; group = ('[' >> delimited(in_group=true) >> ']' >> int_) [ phx::while_(_2--) [ phx::insert(_val, phx::end(_val), phx::begin(_1), phx::end(_1)) ] ]; BOOST_SPIRIT_DEBUG_NODES((raw)(delimited)(group)); bool r = phrase_parse(first, last, delimited(false), space,v); if (r) std::copy(v.begin(), v.end(), std::ostream_iterator<std::string>(std::cout, "\n")); } </code></pre> Prints: <pre><code>w1 w2 w3 w2 w3 w4 w1 w2 w3 w2 w3 w4 w1 w2 w3 w2 w3 w4 </code></pre> (besides debug info)
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1. POparsing a simple repeated text macro with Boost.spirit
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1. POparsing a simple repeated text macro with Boost.spirit
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1. COMade this a bit more readable by aliasing `_r1` to `in_group`
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2. CORemoved c++11 bits because they were irrelevant to the answer and didn't really simplify much
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