cpast - Code Testing and Analysis Tool

We are working on making cpast, more accessible and simple for all. If you have experience with python and/or writing prompts, consider contributing to cpast_llm repo.

Introduction

Have you ever found yourself stuck in the middle of a coding contest, frustrated by a bug or an elusive edge case that just won’t reveal itself? Or maybe you’ve spent countless hours comparing outputs manually, only to find that the real problem was a tricky test case you hadn’t considered. Well, I’ve been there, and I have good news: there’s a solution that can change the way you approach competitive programming forever.

Introducing cpast—the game-changing tool designed specifically for competitive programmers and developers who want to enhance their coding efficiency and solve problems faster. Written in Rust for speed and reliability, cpast simplifies the process of comparing outputs from different code files, regardless of the programming language. This allows you to focus on crafting the best solution to your problem without worrying about the technicalities of cross-language compatibility.

Here’s the best part: with cpast, all you need is your solution file and the input format, and you can debug your code to perfection without having to look at or rely on anyone else’s code. No more peeking at other people's solutions to figure out what went wrong. Now, you can independently find those tricky cases that make all the difference, allowing you to learn and improve your problem-solving skills honestly and effectively.

Checkout the blog post here

Usecases

0. Debugging your CP/DSA questions.
1. Live hacking in during/post Codeforces contests.
2. Generate testcases for problem setters.
3. Reinforcement learning for large language models and stress testing their code generation accuracy.

Getting Started

https://github.com/user-attachments/assets/3b7d5b88-5a2a-4d01-8d5b-31f86b9a96db

Installation

To get started with cpast, you need to install it. You can do this by running the following command:

cargo install cpast

winget install rustup
rustup toolchain install stable-x86_64-pc-windows-gnu
rustup default stable-x86_64-pc-windows-gnu

sudo apt install xorg-dev libxcb-composite0-dev

cargo install cpast --no-default-features

Usage

Here's a simple example of how to use cpast:

test

cpast test -c correct.cpp -t incorrect.cpp -g "(N) (?:N){\1}" --iterations 100

• correct.cpp should contain the correct code.
• incorrect.cpp should contain the incorrect code.
• (N) (?:N){\1} is the language generator.
• 100 is the number of test iterations.

generate

cpast generate "S[10,@CH_UPPER@]"

• Generates string of length 10, of uppercase characters only

Language Specification

At the heart of cpast is clex, a powerful custom language generator that gives you complete control over input patterns. Imagine regex, but specifically designed for generating random test cases. With clex, you can easily define and automate complex input scenarios to stress-test your code, uncover hidden bugs, and identify edge cases that might otherwise go unnoticed.

For more information on the clex language and its usage, please refer to the Grammar Rules for Clex Generator.

Meta

• Changelog
• Future Roadmap
• Clex Language Specs
• Clex FAQs
• cpast_llm
• Alternatives to cpast