This is a simple and tiny implementation of a concrete number parser written in Rust.

What's a concrete number?

A concrete number is a number associated with the thing it's counting. Here I'm using it to mean a combination of a numerical quantity and an SI physical unit—for example, "3 metres", or "12 Newtons".

Goals:

• Add, subtract, multiply, and divide concrete numbers
• Perform unit conversion

Todo:

• Model concrete numbers
• Write lexer to convert string inputs into concrete numbers
• Write parser to evaluate math expressions and output result, including unit conversion
• Turn into CLI tool for command-line unit parsing
• Process SI prefixes
• Implement unit conversion