add-mult-parser.cljc

(def addmult-parser
  (instaparse.core/parser
   "prog= spaces? add-sub spaces?
    <add-sub> = mult-div | add | sub
    add= add-sub spaces? <'+'> spaces? mult-div
    sub= add-sub spaces? <'-'> spaces? mult-div
    <mult-div> = number | mult | div
    mult= mult-div spaces? <'*'> spaces? number
    div= mult-div spaces? <'/'> spaces? number
    number= #'-?[0-9]+'
    <spaces> = <#'\\s+'>"))