Initial commit

* Parser, compiler, objects, and VM base implementations
* Stuff will print out, functions called, etc
* There are probably plenty of bugs but this is a good starting point to
  start committing changes into git

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/obj/none.rs

@@ -0,0 +1,39 @@
+use crate::obj::prelude::*;
+use std::{any::Any, sync::LazyLock};
+
+pub static NONE_INST: LazyLock<ObjPtr> = LazyLock::new(|| ObjPtr::new(None::new()));
+static NONE_STR: LazyLock<ObjPtr> = LazyLock::new(|| ObjPtr::new(Str::new("None")));
+
+static NONE_ATTRS: LazyLock<AttrsPtr> = LazyLock::new(|| {
+    attrs_ptr! {
+        //
+        "__str__" => builtin_fun_ptr!("__str__", |_vm, args, _state| {
+            if args.len() != 1 {
+                todo!("Throw exception: arity error");
+            }
+            BuiltinFunResult::Return(Some(ObjPtr::clone(&NONE_STR)))
+        }),
+    }
+});
+
+#[derive(Debug)]
+pub struct None {
+    attrs: AttrsPtr,
+}
+
+impl None {
+    fn new() -> Self {
+        let attrs = AttrsPtr::clone(&NONE_ATTRS);
+        Self { attrs }
+    }
+}
+
+impl Obj for None {
+    fn attrs(&self) -> AttrsPtr {
+        AttrsPtr::clone(&self.attrs)
+    }
+
+    fn as_any(&self) -> &(dyn Any + 'static) {
+        self
+    }
+}