1 files changed, 37 insertions, 0 deletions
diff --git a/src/types/path.rs b/src/types/path.rs
new file mode 100644
index 0000000..1d095cd
--- /dev/null
+++ b/src/types/path.rs
@@ -0,0 +1,37 @@
+use ulid::Ulid;
+
+use super::ids::AccountId;
+
+#[derive(Debug, thiserror::Error)]
+pub enum PathError {
+    #[error("path is empty")]
+    Empty,
+    #[error("invalid ULID segment: {0}")]
+    BadSegment(String),
+}
+
+#[derive(Clone)]
+pub struct MaterializedPath(String);
+
+impl MaterializedPath {
+    pub fn parse(s: &str) -> Result<Self, PathError> {
+        if s.is_empty() {
+            return Err(PathError::Empty);
+        }
+        for seg in s.split('/') {
+            Ulid::from_string(seg).map_err(|_| PathError::BadSegment(seg.to_string()))?;
+        }
+        Ok(MaterializedPath(s.to_string()))
+    }
+    pub fn as_str(&self) -> &str { &self.0 }
+    pub fn depth(&self) -> usize { self.0.split('/').count() }
+    pub fn is_ancestor_of(&self, other: &MaterializedPath) -> bool {
+        other.0.starts_with(&self.0) && other.0.as_bytes().get(self.0.len()) == Some(&b'/')
+    }
+    pub fn with_child(&self, id: AccountId) -> MaterializedPath {
+        MaterializedPath(format!("{}/{}", self.0, id.as_ulid()))
+    }
+    pub fn root(id: AccountId) -> MaterializedPath {
+        MaterializedPath(id.as_ulid().to_string())
+    }
+}