Function call expression by bk1e

def f(x,a="")
return[a]if""==x
h=x[0,1]
t=x[1..-1]
case h
when'f'
f t,h
when'('
b,u=f t
f u,"(#{a} #{b})"
else
[a,t]
end
end
loop{puts f(gets)[0]}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

download

return top