mann2moon/building-my-programming-language

This is the start for my own programming language called "Yeep"

Yeep Programming Language

This is a simple programming language interpreter for basic arithmetic operations. The interpreter includes a lexer, parser, and abstract syntax tree (AST) nodes for performing arithmetic operations.

Getting Started

1. Create a file called yeep.py.
2. Copy the provided code into the file.
3. Run the file with Python3 using the command python3 yeep.py.
4. Type in an expression (e.g., 2 + 2) and press enter.
5. The interpreter will print the result of the expression.

Tokens

• TT_PLUS: Represents the plus operator '+'
• TT_MINUS: Represents the minus operator '-'
• TT_DIV: Represents the division operator '/'
• TT_MUL: Represents the multiplication operator '*'
• TT_LPAREN: Represents the left parenthesis '('
• TT_RPAREN: Represents the right parenthesis ')'
• TT_INT: Represents an integer number
• TT_FLOAT: Represents a floating-point number
• TT_EOF: Represents the end of the file

Classes

• Tokens: Represents a token with a type and optional value
• Lexer: Converts source code into tokens
• NumberNode: Represents a number in the AST
• BinOpNode: Represents a binary operation in the AST
• UnaryOpNode: Represents a unary operation in the AST
• VarAccessNode: Represents a variable access in the AST
• Parser: Converts tokens into an AST
• Error: Base class for different types of errors
• IllegalCharError: Represents an error for encountering an illegal character
• InvalidSyntaxError: Represents an error for encountering invalid syntax
• ExpectedTokenError: Represents an error for expecting a specific token
• Position: Represents the position of a character in the source code

Usage Example

# Example usage in the shell
import yeep

while True:
    text = input("yeep >> ")
    result = yeep.run("<stdin>", text)

    if isinstance(result, tuple):
        ast, error = result
        if error:
            print(error.as_string())
        else:
            print(ast)