#include "JFile.h"
#include "ZString.h"
#include "Exception.h"

namespace coreutils {

   // MFile and JString share a single virtual MString base (the diamond:
   // both "MFile : virtual public MString" and "JString : virtual public
   // MString"), and a virtual base is initialized only by the *most
   // derived* class's constructor - so JString's own "{}" default
   // initializer never runs here. Left alone, a JFile backed by a new or
   // empty file starts as a raw empty string instead of a valid empty JSON
   // object, and every subsequent locate()/set() call silently misbehaves
   // (no leading "{" for ifNext("{") to match, so writes end up inserted
   // at offset 0 with no braces or separators at all). Detect that case
   // here and seed valid JSON explicitly.
   JFile::JFile(ZString filename) : MFile(filename) {
      if(getLength() == 0)
	*this << "{}";
   }
      
   
}