get started on assets

1 files changed, 84 insertions, 0 deletions

diff --git a/src/assets.rs b/src/assets.rs
new file mode 100644
index 0000000..9b0b7a7
--- /dev/null
+++ b/src/assets.rs
@@ -0,0 +1,84 @@
+use std::fmt::Formatter;
+use std::marker::PhantomData;
+use serde::{Deserialize, Deserializer};
+use serde::de::{MapAccess, Visitor};
+use sha1_smol::Digest;
+
+#[derive(Debug, Deserialize)]
+pub struct Asset {
+    #[serde(skip)]
+    pub name: String,
+    pub hash: Digest,
+    pub size: usize
+}
+
+#[derive(Debug, Deserialize)]
+pub struct AssetIndex {
+    #[serde(rename = "virtual", default)]
+    pub virtual_assets: bool,
+    #[serde(default)]
+    pub map_to_resources: bool,
+
+    #[serde(deserialize_with = "deserialize_assets")]
+    pub objects: Vec<Asset>
+}
+
+trait SetName {
+    fn set_name(&mut self, name: String);
+}
+
+impl SetName for Asset {
+    fn set_name(&mut self, name: String) {
+        self.name = name;
+    }
+}
+
+fn deserialize_assets<'de, D, T>(deserializer: D) -> Result<Vec<T>, D::Error>
+where
+    D: Deserializer<'de>,
+    T: SetName + Deserialize<'de>
+{
+    struct AssetVisitor<T>(PhantomData<T>);
+
+    impl<'de, T> Visitor<'de> for AssetVisitor<T>
+    where
+        T: SetName + Deserialize<'de>
+    {
+        type Value = Vec<T>;
+
+        fn expecting(&self, formatter: &mut Formatter) -> std::fmt::Result {
+            formatter.write_str("asset objects map")
+        }
+
+        fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
+        where
+            A: MapAccess<'de>,
+        {
+            let mut out = Vec::new();
+
+            while let Some((key, mut asset)) = map.next_entry::<String, T>()? {
+                asset.set_name(key);
+                out.push(asset);
+            }
+
+            Ok(out)
+        }
+    }
+
+    deserializer.deserialize_any(AssetVisitor(PhantomData))
+}
+
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_it() {
+        dbg!(serde_json::from_str::<AssetIndex>(r#"{
+            "virtual": true,
+            "objects": {
+                "object1": { "hash": "0d000710b71ca9aafabd8f587768431d0b560b32", "size": 100 },
+                "object2/abc": { "hash": "0e000710b71ca9aafabd8f587768431d0b560b32", "size": 10000 }
+            }
+        }"#).unwrap());
+    }
+}