Python-Custom-Interpreter

Overview

This project is a basic interpreter written in Python. It supports tokenization, parsing, and execution of simple expressions and statements. The interpreter can handle variable declarations, assignments, arithmetic operations, comparisons, and printing values.

Features

• Tokenization: Converts source code into tokens.
• Parsing: Parses tokens to generate an Abstract Syntax Tree (AST).
• Evaluation: Evaluates the AST and executes the statements.
• Command-Line Interface (CLI): Supports commands for tokenization, parsing, evaluation, and execution.

Code Structure

The project consists of a single file:

• main.py: Main script to run the interpreter. It includes:
  • Scanner: Tokenizes the input source code.
  • Parser: Parses tokens and generates an Abstract Syntax Tree (AST).
  • Interpreter: Evaluates the AST and executes the statements.

Usage

To use the interpreter, run the script with one of the following commands:

1. Tokenize: Print tokens from the source file.

   python main.py tokenize <filename>

2. Parse: Parse the source file and print the Abstract Syntax Tree.

   python main.py parse <filename>

3. Evaluate: Evaluate the expression from the source file and print the result.

   python main.py evaluate <filename>

4. Run: Parse and execute the statements from the source file.

   python main.py run <filename>

Examples

Given a source file example.txt with the following content:

var x = 10;
print x;