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use std::fmt;
use std::ops::Deref;
use std::sync::Arc;
use pretty::{DocAllocator, DocBuilder};
use crate::ast::EmptyEnv;
use crate::symbol::{Symbol, SymbolRef};
use crate::types::{ToDoc, Walker};
pub trait KindEnv {
fn find_kind(&self, type_name: &SymbolRef) -> Option<ArcKind>;
}
impl<'a, T: ?Sized + KindEnv> KindEnv for &'a T {
fn find_kind(&self, id: &SymbolRef) -> Option<ArcKind> {
(**self).find_kind(id)
}
}
impl KindEnv for EmptyEnv<Symbol> {
fn find_kind(&self, _id: &SymbolRef) -> Option<ArcKind> {
None
}
}
#[derive(Clone, Debug, Eq, PartialEq, Hash)]
#[cfg_attr(feature = "serde_derive", derive(DeserializeState, SerializeState))]
#[cfg_attr(
feature = "serde_derive",
serde(serialize_state = "crate::serialization::SeSeed")
)]
#[cfg_attr(feature = "serde_derive", serde(de_parameters = "S"))]
#[cfg_attr(feature = "serde_derive", serde(deserialize_state = "S"))]
#[cfg_attr(
feature = "serde_derive",
serde(bound(deserialize = "S: AsMut<crate::serialization::NodeMap>"))
)]
pub enum Kind {
Hole,
Error,
Variable(u32),
Type,
Row,
Function(
#[cfg_attr(feature = "serde_derive", serde(state))] ArcKind,
#[cfg_attr(feature = "serde_derive", serde(state))] ArcKind,
),
}
impl Default for Kind {
fn default() -> Self {
Kind::Hole
}
}
impl Kind {
pub fn hole() -> ArcKind {
ArcKind::new(Kind::Hole)
}
pub fn error() -> ArcKind {
ArcKind::new(Kind::Error)
}
pub fn variable(v: u32) -> ArcKind {
ArcKind::new(Kind::Variable(v))
}
pub fn typ() -> ArcKind {
ArcKind::new(Kind::Type)
}
pub fn row() -> ArcKind {
ArcKind::new(Kind::Row)
}
pub fn function(l: ArcKind, r: ArcKind) -> ArcKind {
ArcKind::new(Kind::Function(l, r))
}
}
#[derive(PartialEq, Copy, Clone, PartialOrd)]
enum Prec {
Top,
Function,
}
struct DisplayKind<'a>(Prec, &'a Kind);
impl fmt::Display for Kind {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", DisplayKind(Prec::Top, self))
}
}
impl<'a, A, B, E> ToDoc<'a, A, B, E> for ArcKind {
fn to_doc(&'a self, allocator: &'a A, _: E) -> DocBuilder<'a, A, B>
where
A: DocAllocator<'a, B>,
{
allocator.text(self.to_string())
}
}
impl<'a> fmt::Display for DisplayKind<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self.1 {
Kind::Hole => "_".fmt(f),
Kind::Error => "!".fmt(f),
Kind::Variable(i) => i.fmt(f),
Kind::Type => "Type".fmt(f),
Kind::Row => "Row".fmt(f),
Kind::Function(ref arg, ref ret) => match self.0 {
Prec::Function => write!(f, "({} -> {})", DisplayKind(Prec::Function, arg), ret),
Prec::Top => write!(f, "{} -> {}", DisplayKind(Prec::Function, arg), ret),
},
}
}
}
#[derive(Clone, Default, Eq, PartialEq, Hash)]
pub struct ArcKind(Arc<Kind>);
#[cfg(feature = "serde")]
impl<'de, S> crate::serde::de::DeserializeState<'de, S> for ArcKind
where
S: AsMut<crate::serialization::NodeMap>,
{
fn deserialize_state<D>(seed: &mut S, deserializer: D) -> Result<ArcKind, D::Error>
where
D: crate::serde::Deserializer<'de>,
{
use crate::serde::de::DeserializeSeed;
crate::serialization::SharedSeed::new(seed)
.deserialize(deserializer)
.map(ArcKind)
}
}
impl ArcKind {
pub fn new(kind: Kind) -> ArcKind {
ArcKind(Arc::new(kind))
}
pub fn make_mut(kind: &mut ArcKind) -> &mut Kind {
Arc::make_mut(&mut kind.0)
}
pub fn strong_count(kind: &ArcKind) -> usize {
Arc::strong_count(&kind.0)
}
}
impl Deref for ArcKind {
type Target = Kind;
fn deref(&self) -> &Kind {
&self.0
}
}
impl From<Kind> for ArcKind {
fn from(kind: Kind) -> ArcKind {
ArcKind(Arc::new(kind))
}
}
impl fmt::Debug for ArcKind {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.fmt(f)
}
}
impl fmt::Display for ArcKind {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.fmt(f)
}
}
type_cache! { KindCache() () { ArcKind, Kind } row hole error typ }
impl<'a, F: ?Sized> Walker<'a, ArcKind> for F
where
F: FnMut(&ArcKind),
{
fn walk(&mut self, typ: &'a ArcKind) {
self(typ);
walk_kind(typ, self)
}
}
pub fn walk_kind<'a, F: ?Sized>(k: &'a ArcKind, f: &mut F)
where
F: Walker<'a, ArcKind>,
{
match **k {
Kind::Function(ref a, ref r) => {
f.walk(a);
f.walk(r);
}
Kind::Hole | Kind::Error | Kind::Variable(_) | Kind::Type | Kind::Row => (),
}
}