WHITESPACE = _{ " " | NEWLINE}

game_tree = { "(" ~ sequence? ~ game_tree* ~ ")"}
sequence = { node{1,} }
node = { ";" ~ property* }
property = { property_identifier ~ property_value+ }
property_identifier = { ('A'..'Z' | 'a'..'z')+ }
property_value = ${ "[" ~ inner ~ "]" }
inner = @{ char* }
char = {
    "\\" ~ "]"
    | !("]") ~ ANY
}