ES script object dynamic layout

Script object dynamic layout feature demonstration.

When executed in ES script console tool, it outputs the following:

test0 object size = 3
test1 object size = 3
test1 object properties = type;attributeNames;propertyNames;persistentPropertyNames;weakReference;size;offset;classAttributeNames;fieldNames;buffer;tag;u8
test1 object fields = f_u8;f_u16
test1 object size = 15
test1 object properties = type;attributeNames;propertyNames;persistentPropertyNames;weakReference;size;offset;classAttributeNames;fieldNames;buffer;tag;u8;dt;float
test1 object fields = f_u8;f_u16;f_dt;f_float

// ES script dynamic data object layout
//
object DLobject
{
 // Object variable(s)
 // Do not influence the object size 
 var m_tag;

 // Object data fields, these form the object data buffer, and
 // its size. Supported are signed and unsigned ints, 8-64 bit wide
 // 32 bit floats, 64 bit date time, and arrays.
 //
 esU8 f_u8;
 esU16 f_u16;

 if( !m_tag#isEmpty() && m_tag > 128 )
 {
   esDT f_dt;
   esF  f_float;

   function addFloat(f)
   {
     f_float += f;
   }

   property dt;
   read: { return f_dt; }
   write: { f_dt = __value; }

   property float;
   read: { return f_float#asDouble(); }
 }

 // Object CTOR 
 new( tag )
 {
   m_tag = tag;
 }

 property tag;
 write: { m_tag = __value; }

 property u8;
 read: { return f_u8; }
}

var test0 = new DLobject(null), test1 = new DLobject(11);

EsScriptDebug::log( "test0 object size = %d", test0$size );
EsScriptDebug::log( "test1 object size = %d", test1$size );
EsScriptDebug::log( "test1 object properties = %s", test1$propertyNames );
EsScriptDebug::log( "test1 object fields = %s", test1$fieldNames );

// Assign the new tag value, the object test1 changes its layout dynamically 
test1$tag = 400; // Or test1.m_tag = 400;

EsScriptDebug::log( "test1 object size = %d", test1$size );
EsScriptDebug::log( "test1 object properties = %s", test1$propertyNames );
EsScriptDebug::log( "test1 object fields = %s", test1$fieldNames );