Sakamoto Yutaro · Software Engineer / Open Source Developer
Compiler and language-tooling developer, focused on legacy system modernization and the cloud platforms around it.
I am the lead developer of opensource COBOL 4J, an open source compiler that translates COBOL into Java, and the author of tree-sitter-cobol, an incremental parser for COBOL. I studied graph theory at university. I am also interested in functional programming, proof assistants and formal methods.
An open source compiler that translates COBOL source code into Java, so that existing COBOL assets can run on the JVM unchanged. It covers the whole pipeline: lexing and parsing, Java code generation, and the runtime library (libcobj). I am the top contributor to the repository, responsible for code generation, intrinsic functions, file I/O and the test infrastructure.
A tree-sitter grammar for COBOL. It provides incremental parsing so that editors, structural search and static analysis tools can work with real COBOL syntax trees. Both fixed-format and free-format source are supported.
I released Hagane COBOL v1.0.0, a COBOL compiler forked from opensource COBOL 4J.
I started building man-hour-calculator, a simple tool for tracking man-hours. You can try it in your browser.
A sample post showing how articles are authored in Markdown, with build-time syntax highlighting and TeX math.
Discussiones Mathematicae Graph Theory, Vol. 39, No. 1, pp. 117–123 (2019)
The University of Electro-Communications
Studied graph theory.