mode2prefix =
q: "~"
a: "&"
o: "@"
h: "%"
v: "+"
prefix2mode =
["~"]: "q"
["&"]: "a"
["@"]: "o"
["%"]: "h"
["+"]: "v"
convert = (mode_or_prefix) ->
mode2prefix[mode_or_prefix] or prefix2mode[mode_or_prefix]
{
:mode2prefix
:prefix2mode
:convert
}