Formula Engine
· Implementation of a formula engine in the "salesforce" style, which
supports the standard force.com syntax, support for generation of
sql and javascript, and extensibility for reuse as an email
templating language.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window formula-engine-0.3.12.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.