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use super::*;
#[derive(Debug)]
pub struct Tree<'a> {
pub namespace: &'a str,
pub nested: std::collections::BTreeMap<&'a str, Tree<'a>>,
}
impl<'a> Tree<'a> {
pub fn new(reader: &'a metadata::Reader, filter: &'a metadata::Filter) -> Self {
let mut tree = Tree::from_namespace("");
for ns in reader.namespaces() {
if filter.includes_namespace(ns) {
tree.insert_namespace(ns, 0);
}
}
tree
}
fn from_namespace(namespace: &'a str) -> Self {
Self { namespace, nested: std::collections::BTreeMap::new() }
}
fn insert_namespace(&mut self, namespace: &'a str, pos: usize) -> &mut Self {
if let Some(next) = namespace[pos..].find('.') {
let next = pos + next;
self.nested.entry(&namespace[pos..next]).or_insert_with(|| Self::from_namespace(&namespace[..next])).insert_namespace(namespace, next + 1)
} else {
self.nested.entry(&namespace[pos..]).or_insert_with(|| Self::from_namespace(namespace))
}
}
pub fn flatten(&self) -> Vec<&Self> {
let mut flatten = if self.namespace.is_empty() { vec![] } else { vec![self] };
flatten.extend(self.nested.values().flat_map(|tree| tree.flatten()));
flatten
}
}
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