K-REPL

I recently had a chance to learn a little about Bioinformatics, and ended up browsing the NIH’s database of genomes here.  Inside the genome data for any particular strain of a species, you’ll find various files with file extensions like “ffa”, “fna”, “ffn” and “frn”.  These are FASTA files. If you’d like an example, here’s…

Back in the day, Paradox was a pretty amazing database.  I recently had a reason to read some Paradox files for a friend, who had a client with a Paradox database.  They needed their data out of the database to insert into something more modern. Googling for the file format of a Paradox DB didn’t…

I’ve always had a fascination with compilers.  As a Java geek, I’m also quite interested in the JVM.  In order to learn a little more about both, and as a way to contribute to the open source world, I decided to implement a compiler for BASIC.   So, jvmBasic consumes BASIC code and emits .class…

We have an Arctic Spa at our house which we enjoy. Recently, an OpenAPI spec has been published for it, so I decided to write a Java wrapper so I could control the spa myself, and monitor temperature with Prometheus and Grafana. The resulting code is here. The wrapper class “com.khubla.kspa.Spa” takes care of all…

Commons Math is an Apache library which includes a variety of mathematical tools, including 1st and 2nd-order ODE solvers.  In order to familiarize myself with the ODE solvers, I wrote a simple program to solve an RC charging circuit. The circuit has these parameters: R (ohms), the resistance of the resistor C (farads), the capacitance…

I’ve recently becoming interested in porting legacy PHP sites to JSPs.   It seemed to me that one of the hardest parts of this problem was parsing the PHP code.  Once a parse tree was created, the next step would be to emit equivalent JSP code. I went looking for an ANTL4 grammar for PHP,…