In your many language support … Delphi Pascal is in there ?
On Mac App Store more explication and detail needed
Textastic for Mac supports the same languages as Textastic for iPad. See http://www.textasticapp.com/v4/manual/lessons/Which_file_types_are_supported.html
Pascal is supported, which should work rather well for Delphi, too.
Customer support service by UserEcho