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use crate::{Shared, Value, ValueType, ValueTypeInfo};
macro_rules! impl_from_value_tuple {
() => {
};
({$ty:ident, $var:ident, $count:expr}, $({$l_ty:ident, $l_var:ident, $l_count:expr},)*) => {
impl_from_value_tuple!{@impl $count, {$ty, $var, $count}, $({$l_ty, $l_var, $l_count},)*}
impl_from_value_tuple!{$({$l_ty, $l_var, $l_count},)*}
};
(@impl $count:expr, $({$ty:ident, $var:ident, $ignore_count:expr},)*) => {
impl <$($ty,)*> $crate::ReflectValueType for ($($ty,)*) {
type Owned = ($($ty,)*);
fn value_type() -> ValueType {
ValueType::StaticType($crate::TUPLE_TYPE)
}
fn value_type_info() -> ValueTypeInfo {
ValueTypeInfo::StaticType($crate::TUPLE_TYPE)
}
}
impl <$($ty,)*> $crate::FromValue for ($($ty,)*)
where
$($ty: $crate::FromValue,)*
{
fn from_value(value: Value) -> Result<Self, $crate::VmError> {
let tuple = value.into_tuple()?;
let tuple = tuple.take()?;
if tuple.len() != $count {
return Err($crate::VmError::from($crate::VmErrorKind::ExpectedTupleLength {
actual: tuple.len(),
expected: $count,
}));
}
#[allow(unused_mut, unused_variables)]
let mut it = Vec::from(tuple.into_inner()).into_iter();
$(
let $var = match it.next() {
Some(value) => <$ty>::from_value(value)?,
None => {
return Err($crate::VmError::from($crate::VmErrorKind::IterationError));
},
};
)*
Ok(($($var,)*))
}
}
impl <$($ty,)*> $crate::ToValue for ($($ty,)*)
where
$($ty: $crate::ToValue,)*
{
fn to_value(self) -> Result<$crate::Value, $crate::VmError> {
let ($($var,)*) = self;
$(let $var = $var.to_value()?;)*
Ok(Value::Tuple(Shared::new($crate::Tuple::from(vec![$($var,)*]))))
}
}
};
}
impl_from_value_tuple!(
{H, h, 8},
{G, g, 7},
{F, f, 6},
{E, e, 5},
{D, d, 4},
{C, c, 3},
{B, b, 2},
{A, a, 1},
);