func flatten(r sickle.Rule) sickle.Rule {
return sickle.Action(r, func(n sickle.Node) sickle.Node {
var ret []sickle.Node
flatten_(&ret, n)
n.Value = ret
return n
})
}
func parseUint(r sickle.Rule) sickle.Rule {
return notNil(sickle.Action(r, func(n sickle.Node) sickle.Node {
nodes := n.Value.([]sickle.Node)
runes := make([]rune, 0, len(nodes))
for _, node := range nodes {
runes = append(runes, node.Value.(rune))
}
str := string(runes)
num, err := strconv.ParseInt(str, 10, 64)
if err == nil {
n.Value = uint64(num)
} else {
n.Value = nil
}
return n
}))
}