// reads a STON address initial context
private IStonInitialContext ReadInitialContext(StonTokenReader reader)
{
int addressOpen = reader.ExpectChartype(StonChartype.AddressBegin);
// reference defining context
if (addressOpen == '$')
{
reader.PeekSignificant();
return(ElementFactory.CreateAncestorInitialContext(0));
}
else if (addressOpen == '^')
{
// document core
if (reader.Peek() == '*')
{
reader.ReadAndSkip();
return(ElementFactory.CreateGlobalEntityInitialContext(""));
}
// reference defining context ancestor
else
{
int ancestorOrder = 1;
reader.PeekSignificant();
while (reader.TryAndSkip(StonChartype.AncestorAccess))
{
++ancestorOrder;
}
return(ElementFactory.CreateAncestorInitialContext(ancestorOrder));
}
}
// globally identified entity
else
{
reader.PeekSignificant();
string globalIdentifier = reader.ReadCanun();
return(ElementFactory.CreateGlobalEntityInitialContext(globalIdentifier));
}
}