Arithmetic calculator which uses a Pratt parser
Project description
Introduction
An arithmetic expression calculator in Python, demoing the Pratt parsing algorithm.
This takes inspiration from this 2010 blog post by Eli Bendersky, as well as a few other sources:
- Simple but Powerful Pratt Parsing
- Pratt Parsers: Expression Parsing Made Easy
- Compiling Expressions (Chapter 17 of Crafting Interpreters
Requirements
Requires Python 3.13 or greater.
Installation
pipx install pratt-calc
In some cases it may be necessary to specify the Python version manually:
PIPX_DEFAULT_PYTHON=python3.13 pipx install pratt-calc
Or, if you have uv installed:
uvx pipx install pratt-calc
Contributing
Install uv, then do:
git clone https://github.com/BrandonIrizarry/pratt-calc
cd pratt-calc
uv sync --locked
Usage
pratt-calc $EXPRESSION
Example:
pratt-calc 3-4*5
This should print -17 at the console.
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