[Boost-users] 'Function String' parser question

5 Apr 2006

      Hi,

I have this parser that parses string that represents a function, (a
c++ function prototype to say)

CONSIDER:

bool
parse_info<> x_parser4(char const* str, FunctionSpec& spec)
{
   // some rules...
		rettype
			= lexeme_d[
						(alpha_p)
							>> *(alnum_p | space_p | ch_p('*'))
					  ][list_actor(spec)];

                // assign function name when match...
		function
			= lexeme_d[
						(alpha_p | ch_p('_'))
							>> *(alnum_p | ch_p('_'))
			          ][assign_a(spec.m_Name)];
  // other rules....
   ....
   return parse(str,top);

}

// Here's what my struct looks like:
struct FunctionSpec {
     std::string m_Name;
     enum eVarType {
             VAR_VOID, VAR_BOOL, VAR_INT...
     }
     eVarType m_RetType;
};

In the function rule what i did was just to assign the name to the
m_Name of spec
In the rettype tule what i did there was to pass the match string
along with the struct (spec) to a class (list_actor) using the
operator()...

Problem is that i can't jsut assign m_RetType to the 'matched string'
delivered to list_actor's operator() since this one is an enumerated
type;

In the code i attached, there is a function that 'maps' a string to
eVarType, but i can't call this function within the list_actor's
operator() body?
i.e.
template <typename ActionIterT>
operator(...,...)
{
 // can't do here?
 // tried to bind the function but it didn't work as well...
}

In summary what i need to do is to assign value for m_RetType and
other members of FunctionSpec using the strings i get from parsing,
e.g.
when i get the string "void" for a match in the rettype rule,
m_RetType will be assigned to VAR_VOID. etc.

-----
krby

[Boost-users] 'Function String' parser question

K M