ioblock.H

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#include "std/support.H"

/*
   This class deals with reading in text bookended by:
#BEGIN X
#END Y
*/

#define IOBlockList ARRAY<IOBlock *>
#define CIOBlock const IOBlock
class IOBlock {
   protected:
      str_ptr _name;
   public:
      IOBlock(Cstr_ptr &name) : _name(name) {}
      virtual ~IOBlock() {}
      
      // Callback for when #BEGIN NAME is encountered
      // (where NAME is what is contained in _name)
      virtual int consume_block(istream &, str_list &leftover) = 0;

      Cstr_ptr &name() const {return _name;}
      virtual int operator==(CIOBlock &b) {return b._name == _name;}
      static int consume(istream &is, const IOBlockList &list,
                         str_list &leftover);
};

template <class T>
class IOBlockMeth: public IOBlock {
   public:
      typedef int (T::*METH)(istream &is, str_list &leftover);
   protected:
      METH  _meth;
      T    *_inst;
   public:
      IOBlockMeth(Cstr_ptr &name, METH meth, T *inst)
         : IOBlock(name), _meth(meth), _inst(inst) {}
      virtual int consume_block(istream &is, str_list &leftover)
         {return (_inst->*_meth)(is, leftover);}
      void set_obj(T *inst) { _inst = inst;}
};

template <class T>
class IOBlockMethList : public ARRAY<IOBlockMeth<T> *> {
   public:
      IOBlockMethList(int num = 5) : ARRAY<IOBlockMeth<T> *>(num) {}
      void set_obj(T *inst) {
         for (int i = 0; i < ARRAY<IOBlockMeth<T>*>::num(); i++) {
            (*this)[i]->set_obj(inst);
         }
      }
};

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