In Fortran, any line starting with a star is a comment line. Textastic does not honour that as exemplified by the following example.
Note how Fortran keywords are highlighted, clearly showing Textastic believes this is regular code instead of a comment block. It gets however worse the comment features one lone single quote:
Textastic believes that the single quote starts a string and it highlights everything following it as a string. Not shown on this picture but the string highlighting only stops at the very end of the file about 300 lines further down!
As a result, Textatic Fortran syntax highlighting is unusable in practice.
Customer support service by UserEcho