lisp
    = cell*

cell
    = _* datum:datum _*
    { return datum }

datum
    = list / boolean / number / symbol

list
    = "(" items:cell* ")"
    { return { type: "list", value: items } }

boolean
    = b:("#t" / "#f")
    { return { type: 'boolean', value: b } }

delim
    = paren / _

number
    = b:( [0-9]+ )
    { return { type: 'number', value: b.join("") } }

symbol
    = b:(!delim c:. { return c })+
    { return { type: 'symbol', value: b.join("") } }

paren
    = "(" / ")"

_
    = w:[ \t\n\r]+