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use crate::{Stack, Value, VmError};
pub trait Args {
fn into_stack(self, stack: &mut crate::Stack) -> Result<(), crate::VmError>;
fn into_vec(self) -> Result<Vec<crate::Value>, crate::VmError>;
fn count(&self) -> usize;
}
macro_rules! impl_into_args {
() => {
impl_into_args!{@impl 0,}
};
({$ty:ident, $value:ident, $count:expr}, $({$l_ty:ident, $l_value:ident, $l_count:expr},)*) => {
impl_into_args!{@impl $count, {$ty, $value, $count}, $({$l_ty, $l_value, $l_count},)*}
impl_into_args!{$({$l_ty, $l_value, $l_count},)*}
};
(@impl $count:expr, $({$ty:ident, $value:ident, $ignore_count:expr},)*) => {
impl<$($ty,)*> Args for ($($ty,)*)
where
$($ty: $crate::ToValue,)*
{
#[allow(unused)]
fn into_stack(self, stack: &mut $crate::Stack) -> Result<(), $crate::VmError> {
let ($($value,)*) = self;
$(stack.push($value.to_value()?);)*
Ok(())
}
#[allow(unused)]
fn into_vec(self) -> Result<Vec<$crate::Value>, $crate::VmError> {
let ($($value,)*) = self;
$(let $value = <$ty>::to_value($value)?;)*
Ok(vec![$($value,)*])
}
fn count(&self) -> usize {
$count
}
}
};
}
repeat_macro!(impl_into_args);
impl Args for Vec<Value> {
fn into_stack(self, stack: &mut Stack) -> Result<(), VmError> {
for value in self {
stack.push(value);
}
Ok(())
}
fn into_vec(self) -> Result<Vec<Value>, VmError> {
Ok(self)
}
fn count(&self) -> usize {
self.len()
}
}