1 files changed, 55 insertions, 0 deletions
diff --git a/src/sheet/loader.rs b/src/sheet/loader.rs
new file mode 100644
index 0000000..613d2a5
--- /dev/null
+++ b/src/sheet/loader.rs
@@ -0,0 +1,55 @@
+use std::{
+    collections::HashMap,
+    path::Path,
+    sync::{Mutex, MutexGuard},
+};
+
+use lazy_static::lazy_static;
+use mlua::{Lua, UserData};
+
+use crate::lua::{ownedfunction::OwnedFunction, runnable::Runnable};
+
+use super::{register::SheetId, tablized::Tablized};
+
+lazy_static! {
+    static ref GLOBAL_LOADER: Mutex<Loader> = Mutex::new(Loader::new());
+}
+
+#[derive(Default)]
+pub struct Loader {
+    loaders: HashMap<String, Box<dyn Runnable<String, Tablized>>>,
+}
+
+impl Loader {
+    pub fn new() -> Self {
+        Self {
+            loaders: HashMap::new(),
+        }
+    }
+
+    pub fn load_sheet(&self, path: String, lua: &Lua) -> Option<SheetId> {
+        let p = Path::new(&path);
+        let loader = self.loaders.get(p.extension()?.to_str()?)?;
+        match loader.run(path, lua) {
+            Ok(table) => table.to_sheet(lua).ok(),
+            Err(_) => None,
+        }
+    }
+
+    pub fn add(&mut self, extension: String, func: Box<dyn Runnable<String, Tablized>>) {
+        self.loaders.insert(extension, func);
+    }
+
+    pub fn get() -> MutexGuard<'static, Loader> {
+        GLOBAL_LOADER.lock().unwrap()
+    }
+}
+
+impl UserData for Loader {
+    fn add_methods<'lua, M: mlua::prelude::LuaUserDataMethods<'lua, Self>>(methods: &mut M) {
+        methods.add_function("add", |_, (extension, func): (String, OwnedFunction)| {
+            GLOBAL_LOADER.lock().unwrap().add(extension, Box::new(func));
+            Ok(())
+        });
+    }
+}