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POboost spirit parse c and cpp style comments
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  1. POboost spirit parse c and cpp style comments
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    copied!<p>I am working on parser for which the comments are meaningful. And before you say it ... the reason is if statement A has a comment in the source in the target statement resulting out of the description of A should be commented with the comment of A. Or comments propagation. Anyways, for this purpose I have to parse and collect the comments not just to skip them.</p> <p>This is what i have so far: </p> <pre><code>#include &lt;boost/config/warning_disable.hpp&gt; #include &lt;boost/spirit/include/qi.hpp&gt; #include &lt;boost/spirit/include/phoenix.hpp&gt; #include &lt;boost/spirit/home/support/iterators/line_pos_iterator.hpp&gt; #include &lt;boost/spirit/repository/include/qi_confix.hpp&gt; #include &lt;boost/spirit/include/phoenix_fusion.hpp&gt; #include &lt;boost/spirit/include/phoenix_stl.hpp&gt; using namespace boost::spirit; #include &lt;boost/fusion/include/adapt_struct.hpp&gt; //////////////////////////////// // extra facilities struct get_line_f { template &lt;typename&gt; struct result { typedef size_t type; }; template &lt;typename It&gt; size_t operator()(It const&amp; pos_iter) const { return get_line(pos_iter); } }; struct Position { Position() : beginLine(-1) , endLine(-1) { } size_t beginLine; size_t endLine; }; struct Comment : public Position { Comment() : Position() , text() { } std::vector&lt;std::string&gt; text; std::string source; }; BOOST_FUSION_ADAPT_STRUCT(Comment, (std::vector&lt;std::string&gt;, text) (std::string, source) (size_t, beginLine) (size_t, endLine) ) // //////////////////////////////// template &lt;typename Iterator&gt; struct comment : qi::grammar&lt;Iterator, Comment(), qi::space_type&gt; { comment() : comment::base_type(start) { c_comment %= repository::confix("/*", "*/")[*(char_ - "*/")]; cpp_comment %= repository::confix("//", eol | eoi)[*(char_ - eol)]; comments %= *(c_comment | cpp_comment); start = raw[ comments[at_c&lt;0&gt;(_val) = _1] ] [ at_c&lt;1&gt;(_val) = construct&lt;std::string&gt;(begin(_1), end(_1)), at_c&lt;2&gt;(_val) = get_line_(begin(_1)), at_c&lt;3&gt;(_val) = get_line_(end(_1)) ] ; } boost::phoenix::function&lt;get_line_f&gt; get_line_; qi::rule&lt;Iterator, Comment(), qi::space_type&gt; start; qi::rule&lt;Iterator, std::string()&gt; c_comment; qi::rule&lt;Iterator, std::string()&gt; cpp_comment; qi::rule&lt;Iterator, std::vector&lt;std::string&gt;()&gt; comments; }; </code></pre> <p>This is the testing code:</p> <pre><code>int main() { std::string str[] = { "/*1234*/", "\n\n/*1234*/", "// foo bar\n", "// foo bar", "\n\n // foo bar\n", "/*1234\n5678*/", }; typedef line_pos_iterator&lt;std::string::const_iterator&gt; Iterator; for (size_t i = 0; i &lt; sizeof(str) / sizeof(str[0]); ++i) { comment&lt;Iterator&gt; g; Iterator iter(str[i].begin()); Iterator end(str[i].end()); Comment comment; bool r = phrase_parse(iter, end, g, qi::space, comment); if (r &amp;&amp; iter == end) std::cout &lt;&lt; comment.beginLine &lt;&lt; comment.source &lt;&lt; "\n"; else std::cout &lt;&lt; "Parsing failed\n"; } } </code></pre> <p>Edit: This code now is compiling and working ... thanks for the help.</p>
 

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