lang0-parser.cljs

(def lang0-parser
  (instaparse.core/parser
   "prog = (spaces? expr spaces? <';'> spaces?)*
    <expr> = assig | add-sub
    assig = varname spaces? <'='> spaces? expr
    <add-sub> = mult-div | add | sub
    add = add-sub spaces? <'+'> spaces? mult-div
    sub = add-sub spaces? <'-'> spaces? mult-div
    <mult-div> = factor | mult |div
    mult = mult-div spaces? <'*'> spaces? factor
    div = mult-div spaces? <'/'> spaces? factor
    <factor> = number | <'('> spaces? expr spaces? <')'> | varget |assig
    <spaces> = <#'\\s+'>
    number = #'-?[0-9]+'
    varget = varname
    varname = #'[a-zA-Z]\\w*'"))