refactor: make all flex stuff use serde

src/core/resource.rs

@@ -1,4 +1,5 @@
-use anyhow::bail;
+use anyhow::anyhow;
+use serde::{de::Visitor, Deserialize};
 use std::path::PathBuf;
 
 pub enum ResourceID {
@@ -24,20 +25,47 @@ impl ResourceID {
 		}
 	}
 }
-
-pub fn parse_resource_id(reader: flexbuffers::Reader<&[u8]>) -> anyhow::Result<ResourceID> {
-	let string = reader.get_str()?;
-
-	Ok(if string.starts_with('/') {
-		let path = PathBuf::from(string);
-		path.metadata()?;
-		ResourceID::File(path)
-	} else if let Some((namespace, path)) = string.split_once(':') {
-		ResourceID::Namespaced {
-			namespace: namespace.to_string(),
-			path: PathBuf::from(path),
-		}
-	} else {
-		bail!("Invalid format for string");
-	})
+impl<'de> Deserialize<'de> for ResourceID {
+	fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+	where
+		D: serde::Deserializer<'de>,
+	{
+		deserializer.deserialize_any(ResourceVisitor)
+	}
+}
+
+struct ResourceVisitor;
+impl<'de> Visitor<'de> for ResourceVisitor {
+	type Value = ResourceID;
+
+	fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+		formatter.write_str("A string containing an absolute path to file or \"[namespace]:[path]\" for a namespaced resource")
+	}
+
+	fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+	where
+		E: serde::de::Error,
+	{
+		Ok(if v.starts_with('/') {
+			let path = PathBuf::from(v);
+			path.metadata().map_err(serde::de::Error::custom)?;
+			ResourceID::File(path)
+		} else if let Some((namespace, path)) = v.split_once(':') {
+			ResourceID::Namespaced {
+				namespace: namespace.to_string(),
+				path: PathBuf::from(path),
+			}
+		} else {
+			return Err(serde::de::Error::custom(anyhow!(
+				"Invalid format for string"
+			)));
+		})
+	}
+
+	fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
+	where
+		E: serde::de::Error,
+	{
+		self.visit_str(&v)
+	}
 }