[Opencxx-users] Re: [opencxx] Let's break OpenC++ up

[James M. D. <mdu...@ya...>]

--- Stefan Reuther <sr...@ma...> wrote:
> whether it fits into its imagination. For example, my "if"
> handling code starts with (the equivalent of)
>    assert(p->First()->Eq("if"));
>    assert(p->Second()->Eq('('));
>    assert(p->Nth(3)->Eq(')'));

This is exactly the interface that needs to be rethought to make
openc++ more valuable. The current usage of the positions, and the
exposure of makes OpenC++ not very reusable.

If we have an If object, this should read like  
this is just a simple class model :
class BaseNode
{};// the base class of the tree
class Token
{
public :
  int Eq(const char * pstr){
  };
}; // the base class of the leaves 

class BaseNodeRef
{
  BaseNode * _p;
public:
  BaseNodeRef(BaseNode * p) : 
     _p(p)
  {
  };
  void assert(int x){
    
  }
  BaseNode * p()
  {
    return _p;
  }

  Token * Nth(int p)
  {
    return 0;// todo
  }
  
};

class IfNode  : public BaseNodeRef
{
  enum IfValues {
    OPENCXX_IF_NAME        = 1,
    OPENCXX_IF_OPENPAREN   = 2,
    OPENCXX_IF_CLOSEPAREN  = 3
  } ;
public : 
   IfNode(BaseNode * p)
      : BaseNodeRef (p)
   {

   }
   void assert()
   {
      BaseNodeRef::assert(GetToken()->Eq("if"));
      BaseNodeRef::assert(GetOpenP()->Eq("("));
      BaseNodeRef::assert(GetCloseP()->Eq(")"));
   }
   Token * GetToken()
   {
     return Nth(OPENCXX_IF_NAME);
   }
   Token * GetOpenP()
   {
     return Nth(OPENCXX_IF_OPENPAREN);
   } 
   Token * GetCloseP()
   {
     return Nth(OPENCXX_IF_CLOSEPAREN);
   } 
};


=====
James Michael DuPont
http://introspector.sourceforge.net/

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