Custom Programming Language

View demo & docs here

A simple programming language built from scratch in Python.
Includes full lexer (tokenizer), parser, and interpreter (no real-world senario, just educational) This version supports basic features like:

• Variable declarations (with int and string types)
• Printing output using say()
• Comment support (# for single-line comments)
• Debug Mode to see tokenizing and parsing happen in real time
• Repeat blocks for simple loops (repeat x { ... })
• Arithmetic operators in expressions (+, -, *, /)
• If statements for conditional execution (if ... { ... })
• Function definitions and calls (function name { ... } and call(name))

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Example Code

# Print
say("Hello, world!")

# Define a string
myname = string("Alex")

# Define an integer
mynumber = int(42)

# Output the values
say(myname)
say(mynumber)

# Repeat block demo
repeat 3 {
    say("hi!")
}

# Arithmetic operators demo
minutes_in_a_day = int(60 * 24)
say(minutes_in_a_day)

sum = int(5 + 3)
say(sum)

complex = int((2 + 3) * 4 - 6 / 2)
say(complex)

# If statement demo
minutes = int(60 * 24)
if minutes > 100 {
    say("there are more than 100 minutes in a day!")
}

# If with equality
x = int(5)
if x == 5 {
    say("x is five!")
}

# Function demo
function hello {
    say("Hello from function!")
}

call(hello)

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How to Run

1. have Python 3.x installed
2. clone the repository
3. add your code to a .txt file
4. run the python file and add your source code's path as an argument

   python run.py sourcecode.txt

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Features

• Integer & string variables
• Print with say()
• Comments (#)
• Tokenizer and AST
• Repeat blocks (repeat x { ... })
• Arithmetic operators in expressions
• If statements for conditional execution
• Function definitions and calls
• Error handling (improved)
• `