predi 0.1.7

PreDi: Symbolic Solidity Predicate Difference Tool

PreDi: Symbolic Solidity Predicate Difference Tool

PreDi is a tool to compare two predicates written in Solidity, the smart contract programming language. PreDi determines if two predicates are equivalent or if one is stronger than the other.

Features

• Tokenizes and parses each Solidity predicate into an Abstract Syntax Tree (AST)
• Simplify AST using symbolic mathematics
• Compare predicates for equivalence and logical strength

Getting Started

Prerequisites

• Python 3.8 or higher
• Install required packages using pip

pip install -r requirements.txt

Running the Tests

To ensure everything is set up correctly, run the unit tests:

python -m unittest discover -s tests

Usage

You can compare two predicates using the main.py script. Here's an example:

python main.py "msg.sender == msg.origin" "a < b"

This will output whether the predicates are equivalent, or which one is stronger.

Example

$ python main.py "msg.sender == msg.origin" "msg.origin == msg.sender"
The predicates are equivalent.

$ python main.py "msg.sender == msg.origin && a >= b" "msg.sender == msg.origin"
The first predicate is stronger.

$ python main.py "msg.sender == msg.origin || a < b" "a < b"
The second predicate is stronger.