A Forth-like interpreter written in Java, with three supported languages: pi, rho and tau.

Supports concept of a continuation, also known as a fibre.

Note that, like Forth, pi uses reverse polish notation. If you've only used in-fix notation, it will all look weird. For example, the expression:

a = b*2 + c

would be expressed as:

2 b * c + 'a =

See sample scripts. Note that MarkDown files are also executable fifth-lang files.

See an example of Literate Programming with fifth-lang using Markdown

Re-organise project structure into multiple modules:

• fifth-common
  • Contains common functionality for all dependant modules, such as file access, logging etc.
• fifth-pi
  • The pi RPN language
• fifth-rho
  • the rho in-fix, python-like language that translates to pi
• fifth-tau
  • Idl for generating networked Dto' and Rpc's

The root of the language documentation is fully fledged out and very coherent.

See scripts folder for test scripts.

• Better error reporting at each stage:
  • Lexer
  • Parser
  • Translator
  • Executor
• Replace operator
• Resume operator
• For loops
• While loops
• Language description other than tests and code
• Interaction with local file system: Danger
• Basic REST calls: Danger

• A final line in a script with a trailing comment fails to parse.