c++ - Spirit semantic actions after eliminating Left Recursion -


To eliminate the left recursive after following the sample in the Spirit Classic FAQ, I understand the correct placeholder for Phoenix I am unable to interpret the meaning of my non-work grammar as shown below: 

  template & lt; Typename this, typename Skipper = qi :: space_type & gt; Structure Parser: qi :: grammar & lt; This, xp (), ska & gt; {Parser (): Parser :: Base_type (expression) {Namespace QI; Expression = word [_val = _1]> & gt; * ((Four _ ('+') >> [_val = phx :: construct & lt; binop & lt; op_add & gt; & gt; (_ 1, _2)] | (four _ ('-')> gt; & gt; _val = phx :: creation & lt; binop & lt; op_sub & gt; (_ 1, _2)]); word = factor [_val = _1]> gt; ; & gt; * ((four _ ('*')>> Factor) [_val = phx :: construct & lt; binop & lt; op_mul & gt; & gt; (_ 1, _2)] | (_ _ _ _ _ = Phx :: creation & lt; binop & lt; op_div & gt; & gt; (_ 1, _2)]); factor = uint_ [4] _val = _1] | var_ [_val = _1] | ('('> expression> gt; & gt; ')' | [_val = _1] | | (four _ ('-')> gt ; Factor) [_val = phx :: creation & lt; unop & lt; op_uminus & gt; & gt; (_ 1)] | (four_ ('+'> gt; factor) [_val = _1]; var_ = Qi :: lexem [+ alpha]; BOOST_SPIRIT_DEBUG_NODE (expression); BOOST_SPIRIT_DEBUG_ NODE (word); BOOST_SPIRIT_DEBUG_NODE (factor); BOOST_SPIRIT_DEBUG_NODE (var_);} Private: qi :: rule & lt; it, var (), skip & gt; var_; qi :: rule & lt; it, xp () Skipper & gt; expression, duration, factor;};           
 
 post text "itemprop =" text "> 
 I think you can actually  
  & gt; & Gt; * ((Four _ ('+') >> [_val = phx :: construct & lt; binop & lt; op_add & gt; & gt; (_ 1, _2)] | (four _ ('-')> gt; & gt; _val = phx :: construct & lt; binop & lt; op_sub & gt; & gt; (_ 1, _2)]   
 pass Do  '+'  as the first constructor parameter, because type  binop  op_add & gt;  already reflects as an operator.  
 It is argued that you now parse here:  
  word [_val = _1]   
 This probably indicates to you : You got this to  _val ! Then, your solution is:  
  & gt; & gt; * ((four_ ('+')> gt ; & Gt; Words) [_val = phx :: construct & lt; binop & lt; op_add & gt; & gt; (_ val, _2)] | (four _ ('-')> gt; & gt; ) [_val = phx :: construct & lt; binop & lt; op_sub & gt; & gt; (_ val, _2)]   
 However, since  four_ (. ..)  is not used, you can change it:  
  & gt; & Gt; * ((Published ('+')> gt; & gt; m) [_val = phx :: construct & lt; binop & lt; op_add & gt; & gt; (_ val, _1)] | (lit (' - ') & gt; & gt; [_value] [_val = phx :: construct & lt; binop & lt; op_sub & gt; & gt; (_ val, _1   
)]

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