Alek Ratzloff
be9a659159
* obj::Bool builtin type is used for truthiness and decision-making * Branches are compiled and seem to be working for basic integer comparison * Updated version of Shredder to what is current as of writing * CheckTruth VM instruction that will explicitly set the condition flag * Probably some other stuff Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
93 lines
2.3 KiB
Rust
93 lines
2.3 KiB
Rust
use crate::{
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obj::{prelude::*, reserved::*},
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vm::error::*,
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};
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use once_cell::sync::Lazy;
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use shredder::Scan;
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use std::fmt::{self, Debug, Formatter};
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pub type BoolRef = ObjRef<Bool>;
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#[derive(Scan)]
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pub struct Bool {
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value: bool,
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vtable: Vtable,
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attrs: Attrs,
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}
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impl Bool {
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/// Gets the value of this boolean.
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pub fn value(&self) -> bool {
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self.value
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}
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}
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impl From<bool> for BoolRef {
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fn from(value: bool) -> Self {
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if value {
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BOOL_TRUE.clone()
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} else {
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BOOL_FALSE.clone()
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}
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}
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}
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impl_obj_readonly!(Bool);
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impl Debug for Bool {
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fn fmt(&self, fmt: &mut Formatter) -> fmt::Result {
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fmt.debug_struct("Bool").field("value", &self.value).finish()
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}
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}
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/// A true boolean value.
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///
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/// This value should be the only instance of a "true" boolean.
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pub static BOOL_TRUE: Lazy<BoolRef> = Lazy::new(||
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self_referring_obj! {
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Bool {
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value: true,
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vtable: Default::default(),
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attrs: Default::default(),
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},
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vtable: |obj_ref: ObjRef| vtable! {
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BOOL_MEMBER_NAME.sym => Method::new_obj(obj_ref.clone(), BOOL_BOOL_FUN.clone()),
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}
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}
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);
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/// A false boolean value.
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///
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/// This value should be the only instance of a "false" boolean.
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pub static BOOL_FALSE: Lazy<BoolRef> = Lazy::new(||
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self_referring_obj! {
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Bool {
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value: false,
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vtable: Default::default(),
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attrs: Default::default(),
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},
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vtable: |obj_ref: ObjRef| vtable! {
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BOOL_MEMBER_NAME.sym => Method::new_obj(obj_ref.clone(), BOOL_BOOL_FUN.clone()),
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}
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}
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);
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////////////////////////////////////////////////////////////////////////////////
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// Builtin Bool functions
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////////////////////////////////////////////////////////////////////////////////
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/// Bool.__bool__(self) impl
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static BOOL_BOOL_FUN: Lazy<NativeFunRef> = Lazy::new(|| {
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NativeFun::new_obj(1, |_callee, vm, args| {
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{
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read_obj_downcast!(let value: Option<&Bool> = &args[0]);
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value.ok_or_else(|| Error::ValueError {
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error: "expected Bool value".to_string(),
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})?;
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}
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// just push a copy of the "self" value
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vm.push(args[0].clone());
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Ok(crate::vm::signal::Signal::Return)
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})
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});
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