When I first learned about Java (in early 1999) I quickly realized that this was a worthy successor to Pascal, which had until then been my favourite programming language.

At the time I had about 100.000 lines of Delphi Pascal hobby code and thus a non-trivial migration problem. I chose to write a Pascal parser in JavaCC, and use that for the conversion.

All modules were converted and I also used the same transformer to convert a major open source mathematical library.