Crapculates current line in editor.
 
Variables:
  Names: $a .. $z
  Assignment: $a := expression ;
 
Crapculator:
  Syntax: ( ) d.d
  Constants: e pi
  Binary: ^ * / % - +
  Unary: - + sqrt ln log sin cos tan rad deg floor ceil frac fac
  Line may end with "=".
 
Hackulator:
  Syntax: ( ) d 0xh IPv4
  Binary: * / % - + >> << & ^ |
  Unary: - + ~
  Line may end with:
  "=" for  hex,
  "=d" for decimal,
  "=u" for unsigned decimal
  "=4" for IPv4 address.