1 files changed, 35 insertions, 0 deletions
diff --git a/crates/rebel-lang/src/scope.rs b/crates/rebel-lang/src/scope.rs
new file mode 100644
index 0000000..6dcc7ee
--- /dev/null
+++ b/crates/rebel-lang/src/scope.rs
@@ -0,0 +1,35 @@
+use std::collections::HashMap;
+
+use rebel_parse::ast;
+
+#[derive(Debug, Clone)]
+pub struct Module<T>(HashMap<String, ModuleEntry<T>>);
+
+impl<T> Module<T> {
+	pub fn lookup(&self, path: &[ast::Ident<'_>]) -> Option<&T> {
+		let (ident, rest) = path.split_first()?;
+
+		match self.0.get(ident.name)? {
+			ModuleEntry::Module(module) => module.lookup(rest),
+			ModuleEntry::Def(typ) => {
+				if rest.is_empty() {
+					Some(typ)
+				} else {
+					None
+				}
+			}
+		}
+	}
+}
+
+impl<T> Default for Module<T> {
+	fn default() -> Self {
+		Self(Default::default())
+	}
+}
+
+#[derive(Debug, Clone)]
+pub enum ModuleEntry<T> {
+	Module(Module<T>),
+	Def(T),
+}