lil command line math utility - purpose of this project is to..
- learn test driven development principles (TDD)
- write a command line utility that has 100% coverage
- set up a CD/CI pipeline that uses testing before adding new featues
turns out, parsing an expression is not a trivial problem. the first thing i stumbled across was the shunting yard algorithm, invented by dijkstra. this will be the first implementation. also found this article interesting (adding it here to read it later: https://www.engr.mun.ca/~theo/Misc/exp_parsing.htm). it proposes parsing via recursive descent and he derives a technique known as precedence climbing