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POSkipper does not work in boost::spirit
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  1. POSkipper does not work in boost::spirit
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    copied!<p>I use boost spirit to parse a color. That worked quite well, but after I changed the the iterator type, the skipper stopped working.</p> <pre><code>"rgb(1.0,1.0,0.5)" // this works " rgb(0.2,0.2,0.2)" // this fails </code></pre> <p>Here is the header:</p> <pre><code>struct ColorGrammar : public qi::grammar&lt;StringIterator, Color(), chs::space_type&gt; { //! Iterator type for this grammar typedef StringIterator ItType; //! Skipper type used in this grammar typedef chs::space_type Skipper; //! Rule to parse a number with up to 3 digits qi::uint_parser&lt;uint8, 10, 1, 3&gt; number; //! Rule to parse a hex digit qi::uint_parser&lt;uint8, 16, 1, 1&gt; hexdigit; ColorGrammar(); //! Rule for rgb(...) qi::rule&lt;ItType, Color(), qi::locals&lt;float, float&gt;, Skipper&gt; rule_rgb; //! Rule for rgba(...) qi::rule&lt;ItType, Color(), qi::locals&lt;float, float, float&gt;, Skipper&gt; rule_rgba; //! Mainrule qi::rule&lt;ItType, Color(), Skipper&gt; rule_color; }; </code></pre> <p>Here is the cpp</p> <pre><code>ColorGrammar::ColorGrammar() : ColorGrammar::base_type(rule_color, "color-grammar") { using namespace qi::labels; using boost::phoenix::construct; auto&amp; _1 = qi::_1; rule_rgb = '(' &gt;&gt; qi::float_[_a = _1] &gt;&gt; ',' &gt;&gt; qi::float_[_b = _1] &gt;&gt; ',' &gt;&gt; qi::float_[_val = phx::construct&lt;Color&gt;(_a, _b, _1)] &gt;&gt; ')'; rule_rgba = '(' &gt;&gt; qi::float_[_a = _1] &gt;&gt; ',' &gt;&gt; qi::float_[_b = _1] &gt;&gt; ',' &gt;&gt; qi::float_[_c = _1] &gt;&gt; ',' &gt;&gt; qi::float_[_val = phx::construct&lt;Color&gt;(_a, _b, _c, _1)] &gt;&gt; ')'; rule_color = (qi::lit("rgb") &gt;&gt; rule_rgb) | (qi::lit("rgba") &gt;&gt; rule_rgba); } </code></pre> <p>And the call:</p> <pre><code>Color out; StringIterator begin = str.cbegin(); StringIterator end = str.cend(); bool result = qi::phrase_parse(begin, end, color_, chs::space, out); </code></pre> <p>I'm sure, it is only a little misstake, but I am not able to see it. Maybe i watched too long at the source... can you see a misstake?</p>
 

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