BASIC Interpreter

This is an interpreter for a BASIC-like language written in C#.

This code follows the tutorial "Make your own programming language in Python" series on YouTube which is written in Python 3, and this code is rewritten in C#.

Note that there are two Main functions separated in two files (BasicInterpreter/Example.cs and BasicInterpreter/Shell.cs). You may want to comment a file temporary before running another file.

To start with, you can run BasicInterpreter/Example.cs which runs the BasicInterpreter/example.myopl file. You may want to set the path to the example.myopl manually. You can also investigate the grammar rules (syntax) of the language in grammer.txt.

The other Main function is in a file called BasicInterpreter/Shell.cs. You can try programming in the shell when you run the program.

For viewing all the built-in variables and functions that are avaliable, you can read BasicInterpreter/Basic.cs.

Progress Checklist

• EP 1 - Lexer
• EP 2 - Parser
• EP 3 - Interpreter
• Bonus - Power operator
• EP 4 - Variables
• EP 5 - Comparisons and logical operators
• EP 6 - If statement
• EP 7 - For and while statements
• EP 8 - Function
• EP 9 - Strings
• EP 10 - Lists
• EP 11 - Built-in functions
• EP 12 - Multi-line statements
• EP 13 - Return, continue, break
• EP 14 - Run statements and comments (finale 🎉)

Known Issues

1. Built-in functions append(), pop(), and extend() do not work because the built-in functions and the actual program use different Context. See Execute() in BasicInterpreter/Runtime/BuiltInFunction.cs and Visit_CallNode() in BasicInterpreter/Interpreter.cs.