LF-BASIC is a BASIC interpreter based roughly on Minimal BASIC (https://www.ecma-international.org/publications/files/ECMA-ST-WITHDRAWN/ECMA-55,%201st%20Edition,%20January%201978.pdf). It is written in Python and uses ply (https://github.com/dabeaz/ply) for the lexer and parser. This project is still a work in progress but it is functional and capable of running The Oregon Trail 1978 https://github.com/LiquidFox1776/oregon-trail-1978-basic.
This project depends on ply and can be installed with the following command pip install ply
The interpreter can be run in an interactive shell or the interpreter can accept command line arguments to load a file from the command line, see the below usage for the arguments that the interpreter will accept
optional arguments:
-h, --help show this help message and exit
--file, -f Program file to run
python BASIC.py -f yourprogram.bas
python BASIC.py yourprogram.bas
The following commands are available when running in the interactive shell
CLS - Clears the screen
LOAD filename - Loads a bas file specified by filename
RUN - Runs a loaded or entered program
DEBUG - Steps through the program line by line displaying various pieces of information
LIST - Displays the program currently in memory
EXIT - Exits the interpreter
HELP - Supposed to display help information, but does not do so currently
Program lines can be entered in the the interactive shell by typing a line number followed by a statement followed by the enter key. Once the program is entered in that manner a RUN or DEBUG command can be issued to run the BASIC program
This is still a work in progress with some known issues and will take some time before I consider it to be stable. I estimate that I will perform some updates to this project at least once a week.
This project is licensed under the MIT License - see the LICENSE file for details