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I have no idea what this is... ELI5?
It is a simple interpreter for expressions.

See more at : https://en.wikipedia.org/wiki/Shunting-yard_algorithm

These toy-intepreters are very useful for putting scripting support in your applications.

I recently wrote something similar for allowing evaluation to be applied to arbitrary golang objects/structures - so that I could write simple scripts rather than hard-coding logic in my application.

With only a few primitives it becomes very useful!

https://github.com/skx/evalfilter