shunting

A tiny math parser for the commandline

``` $ tox

4! 24 a = sin(0.2)^2 + cos(0.2)^2 a 1 (-3)! NaN (84 % (5/2)) ! 1.32934 pi * 2.1^2 / cbrt(-(6+3)) -6.660512 ```

shunting references

• http://en.wikipedia.org/wiki/Operator-precedence_grammar
• http://en.wikipedia.org/wiki/Operator-precedence_parser
• http://en.wikipedia.org/wiki/Shunting-yard_algorithm
• http://wcipeg.com/wiki/Shuntingyardalgorithm
• http://en.wikipedia.org/wiki/Operator_associativity
• http://www.haskell.org/pipermail/haskell-prime/2010-July/003229.html
• http://en.wikipedia.org/wiki/Algebraic_expression
• http://h14s.p5r.org/2014/10/shiftreduce-expression-parsing-by-douglas-gregor.html