Merge pull request #4 from jwodder/smartstring

Use `smartstring` for `Component`

Cargo.toml

@@ -17,6 +17,7 @@ clap = { version = "4.3.24", default-features = false, features = ["derive", "er
 get-size = { version = "0.1.4", features = ["derive"] }
 serde = { version = "1.0.204", features = ["derive"] }
 serde_json = { version = "1.0.120", features = ["preserve_order"] }
+smartstring = "1.0.1"
 thiserror = "1.0.62"
 thousands = "0.2.0"
 time = { version = "0.3.36", features = ["parsing", "serde"] }

README.md

@@ -46,15 +46,15 @@ Examples
 ```console
 $ manifest-size https://datasets.datalad.org/dandi/zarr-manifests/zarr-manifests-v2-sorted/001/e3b/001e3b6d-26fb-463f-af28-520a25680ab4/326273bcc8730474323a66ea4e3daa49-113328--97037755426.json
 Raw    response: 13 818 966 bytes
-Parsed response: 18 473 917 bytes
+Parsed response: 18 170 616 bytes
 ```
 
 ```console
 $ manifest-size --json https://datasets.datalad.org/dandi/zarr-manifests/zarr-manifests-v2-sorted/c7e/25d/c7e25dca-4dc9-4e83-a0d7-5fee56fa8773/c23f15b26134d808b072b8c93b1eeed8-48935--29709893986.json
 {
   "url": "https://datasets.datalad.org/dandi/zarr-manifests/zarr-manifests-v2-sorted/c7e/25d/c7e25dca-4dc9-4e83-a0d7-5fee56fa8773/c23f15b26134d808b072b8c93b1eeed8-48935--29709893986.json",
   "raw_bytes": 5935826,
-  "parsed_bytes": 7983735
+  "parsed_bytes": 7867736
 }
 ```
 

src/component.rs

@@ -1,10 +1,11 @@
 use get_size::GetSize;
+use smartstring::alias::CompactString;
 use thiserror::Error;
 
 /// A nonempty path component that does not contain a forward slash or NUL nor
 /// equals `.` or `..`
-#[derive(Clone, Eq, GetSize, Hash, Ord, PartialEq, PartialOrd)]
-pub(crate) struct Component(String);
+#[derive(Clone, Eq, Hash, Ord, PartialEq, PartialOrd)]
+pub(crate) struct Component(CompactString);
 
 fn validate(s: &str) -> Result<(), ParseComponentError> {
     if s.is_empty() {
@@ -29,6 +30,16 @@ validstr!(
     "a plain path component"
 );
 
+impl GetSize for Component {
+    fn get_heap_size(&self) -> usize {
+        if self.0.is_inline() {
+            0
+        } else {
+            self.0.capacity()
+        }
+    }
+}
+
 #[derive(Clone, Copy, Debug, Eq, Error, PartialEq)]
 pub(crate) enum ParseComponentError {
     #[error("path components cannot be empty")]