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/int.rs

@@ -0,0 +1,53 @@
+use crate::obj::prelude::*;
+use std::{any::Any, sync::LazyLock};
+
+pub type IntValue = i64;
+
+static INT_ATTRS: LazyLock<AttrsPtr> = LazyLock::new(|| {
+    attrs_ptr! {
+        //
+        "__str__" => builtin_fun_ptr!("__str__", |_vm, args, _state| {
+            if args.len() != 1 {
+                todo!("Throw exception: arity error");
+            }
+            let arg_any = &args[0].as_any();
+            let obj = arg_any.downcast_ref::<Int>().expect("Int.__str__ did not receive Int?");
+
+            BuiltinFunResult::Return(Some(ObjPtr::new(Str::new(obj.value().to_string()))))
+        }),
+    }
+});
+
+#[derive(Debug, Clone)]
+pub struct Int {
+    attrs: AttrsPtr,
+    value: IntValue,
+}
+
+impl Int {
+    pub fn new(value: IntValue) -> Self {
+        let attrs = AttrsPtr::clone(&INT_ATTRS);
+        // TODO intern
+        Int { attrs, value }
+    }
+
+    pub fn value(&self) -> IntValue {
+        self.value
+    }
+}
+
+impl Obj for Int {
+    fn attrs(&self) -> AttrsPtr {
+        AttrsPtr::clone(&self.attrs)
+    }
+
+    fn as_any(&self) -> &(dyn Any + 'static) {
+        self
+    }
+}
+
+impl ToString for Int {
+    fn to_string(&self) -> String {
+        format!("{}", self.value())
+    }
+}