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use crate::syntax::{Label, V};
/// Stores an alpha-normalized variable.
#[derive(Clone, Copy, Eq)]
pub struct AlphaVar {
alpha: V<()>,
}
// TODO: temporary hopefully
impl std::cmp::PartialEq for AlphaVar {
fn eq(&self, _other: &Self) -> bool {
true
}
}
// Exactly like a Label, but equality returns always true.
// This is so that ValueKind equality is exactly alpha-equivalence.
#[derive(Clone, Eq)]
pub struct Binder {
name: Label,
}
impl AlphaVar {
pub(crate) fn new(alpha: V<()>) -> Self {
AlphaVar { alpha }
}
pub(crate) fn default() -> Self {
AlphaVar { alpha: V((), 0) }
}
pub(crate) fn idx(&self) -> usize {
self.alpha.idx()
}
}
impl Binder {
pub(crate) fn new(name: Label) -> Self {
Binder { name }
}
pub(crate) fn to_label(&self) -> Label {
self.clone().into()
}
}
/// Equality up to alpha-equivalence
impl std::cmp::PartialEq for Binder {
fn eq(&self, _other: &Self) -> bool {
true
}
}
impl std::fmt::Debug for AlphaVar {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "AlphaVar({})", self.alpha.1)
}
}
impl std::fmt::Debug for Binder {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "Binder({})", &self.name)
}
}
impl From<Binder> for Label {
fn from(x: Binder) -> Label {
x.name
}
}
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