add Function to Value

src/types.rs

@@ -1,4 +1,4 @@
-use std::{cell::RefCell, collections::HashMap, hash::Hash, rc::Rc};
+use std::{cell::RefCell, collections::HashMap, fmt::Debug, hash::Hash, rc::Rc};
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub enum ValueInner {
@@ -6,6 +6,7 @@ pub enum ValueInner {
 	Number(i64),
 	String(String),
 	Table(Table),
+	Function(Function),
 }
 
 macro_rules! impl_from {
@@ -75,3 +76,29 @@ impl Table {
 		}
 	}
 }
+
+#[derive(Clone)]
+pub struct Function {
+	name: &'static str,
+	inner: Rc<dyn Fn(&[Value]) -> Value>,
+}
+
+impl Debug for Function {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		write!(f, "<function {}>", self.name)
+	}
+}
+
+impl PartialEq for Function {
+	fn eq(&self, other: &Self) -> bool {
+		std::ptr::eq(self.inner.as_ref(), other.inner.as_ref())
+	}
+}
+
+impl Eq for Function {}
+
+impl Hash for Function {
+	fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+		std::ptr::hash(self.inner.as_ref(), state)
+	}
+}