cicada 1.2.2

A simple Bash-like Unix shell.
Documentation 
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num = @{ int ~ ("." ~ ASCII_DIGIT*)? ~ (^"e" ~ int)? }
    int = { ("+" | "-")? ~ ASCII_DIGIT+ }

operation = _{ add | subtract | multiply | divide | power }
    add      = { "+" }
    subtract = { "-" }
    multiply = { "*" }
    divide   = { "/" }
    power    = { "^" }

expr = { term ~ (operation ~ term)* }
term = _{ num | "(" ~ expr ~ ")" }

calculation = _{ SOI ~ expr ~ EOI }

WHITESPACE = _{ " " | "\t" }