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