A framework to demonstrate the basics of programming language lexing and parsing.
This project uses code from (PLY)(https://github.com/dabeaz/ply) (Python Lex-Yacc) to build the foundation of a language interpreter.
To begin, install python 3. You may have it installed on your system already as python3.
This project is pure python and has no external dependencies to install.
To run the example script, run
python starter.py
You will be placed into an interactive console where you can define variables and print them out.
For example,
$ python starter.py
calc > my_number = 42
calc > my_number
42
You can toggle debug output (which is on by default) by setting the debug value near the top of starter.py.
To escape the console, use ctrl-c.
In the ply project, methods beginning with p_ are given special handling as parsers. They require a docstring to document what will be parsed, and python code to handle the incoming parsed token object.
To add a new language feature, consider adding a new p_* method and experimenting.