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This repository contains a branch named rewrite-using-antlr4 where I started to write a Java code using ANTLR4 to do the translation from Fortran to Java. The main entry file is FortranHandlerPrototype.java.

The following steps are needed:

• implement methods in FortranListener.java that create an object-oriented AST
• implement methods to unparse that AST into Java (possibly including the Dummy class for handling GOTOs for now)
• run this on all BLAS methods
• use Maven plugin (what's its name again?) to do the bytecode replacements from Dummy.goto() and Dummy.label() into JVM GOTOs
• use above mechanics to also translate BLAS test suite

I suggest adding topics such as fortran77, fortran, java, lapack, transpiler in the About section at https://github.com/jonathanschilling/f2j.

GOTO statements should be easy to translate into "normal" code with if/else and do/while.
Cite Dijkstra why one should do this: A case against the GO TO statement.
Here is an article on this: http://www.cs.unibo.it/~martini/PP/bohm-jac.pdf