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use std::collections::BTreeMap;
use dhall::semantics::{Hir, HirKind, Nir, NirKind};
use dhall::syntax::{Builtin, ExprKind, NumKind, Span};
use crate::{Deserialize, Error, Result, Sealed};
/// A simple value of the kind that can be encoded/decoded with serde
/// TODO
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Value {
kind: Box<ValKind>,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ValKind {
// TODO: redefine NumKind locally
Num(NumKind),
Text(String),
Optional(Option<Value>),
List(Vec<Value>),
// TODO: HashMap ?
Record(BTreeMap<String, Value>),
Union(String, Option<Value>),
}
/// The type of a `simple::Value`.
/// TODO
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Type {
kind: Box<TyKind>,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum TyKind {
Bool,
Natural,
Integer,
Double,
Text,
Optional(Type),
List(Type),
Record(BTreeMap<String, Type>),
Union(BTreeMap<String, Option<Type>>),
}
impl Value {
pub(crate) fn new(kind: ValKind) -> Self {
Value {
kind: Box::new(kind),
}
}
pub(crate) fn from_nir(nir: &Nir) -> Option<Self> {
Some(Value::new(match nir.kind() {
NirKind::Num(lit) => ValKind::Num(lit.clone()),
NirKind::TextLit(x) => ValKind::Text(
x.as_text()
.expect("Normal form should ensure the text is a string"),
),
NirKind::EmptyOptionalLit(_) => ValKind::Optional(None),
NirKind::NEOptionalLit(x) => {
ValKind::Optional(Some(Self::from_nir(x)?))
}
NirKind::EmptyListLit(_) => ValKind::List(vec![]),
NirKind::NEListLit(xs) => ValKind::List(
xs.iter()
.map(|v| Self::from_nir(v))
.collect::<Option<_>>()?,
),
NirKind::RecordLit(kvs) => ValKind::Record(
kvs.iter()
.map(|(k, v)| Some((k.into(), Self::from_nir(v)?)))
.collect::<Option<_>>()?,
),
NirKind::UnionLit(field, x, _) => {
ValKind::Union(field.into(), Some(Self::from_nir(x)?))
}
NirKind::UnionConstructor(field, ty)
if ty.get(field).map(|f| f.is_some()) == Some(false) =>
{
ValKind::Union(field.into(), None)
}
_ => return None,
}))
}
pub fn kind(&self) -> &ValKind {
self.kind.as_ref()
}
}
impl Type {
pub fn new(kind: TyKind) -> Self {
Type {
kind: Box::new(kind),
}
}
pub(crate) fn from_nir(nir: &Nir) -> Option<Self> {
Some(Type::new(match nir.kind() {
NirKind::BuiltinType(b) => match b {
Builtin::Bool => TyKind::Bool,
Builtin::Natural => TyKind::Natural,
Builtin::Integer => TyKind::Integer,
Builtin::Double => TyKind::Double,
Builtin::Text => TyKind::Text,
_ => unreachable!(),
},
NirKind::OptionalType(t) => TyKind::Optional(Self::from_nir(t)?),
NirKind::ListType(t) => TyKind::List(Self::from_nir(t)?),
NirKind::RecordType(kts) => TyKind::Record(
kts.iter()
.map(|(k, v)| Some((k.into(), Self::from_nir(v)?)))
.collect::<Option<_>>()?,
),
NirKind::UnionType(kts) => TyKind::Union(
kts.iter()
.map(|(k, v)| {
Some((
k.into(),
v.as_ref()
.map(|v| Ok(Self::from_nir(v)?))
.transpose()?,
))
})
.collect::<Option<_>>()?,
),
_ => return None,
}))
}
pub fn kind(&self) -> &TyKind {
self.kind.as_ref()
}
pub fn to_value(&self) -> crate::value::Value {
crate::value::Value {
hir: self.to_hir(),
as_simple_val: None,
as_simple_ty: Some(self.clone()),
}
}
pub(crate) fn to_hir(&self) -> Hir {
let hir = |k| Hir::new(HirKind::Expr(k), Span::Artificial);
hir(match self.kind() {
TyKind::Bool => ExprKind::Builtin(Builtin::Bool),
TyKind::Natural => ExprKind::Builtin(Builtin::Natural),
TyKind::Integer => ExprKind::Builtin(Builtin::Integer),
TyKind::Double => ExprKind::Builtin(Builtin::Double),
TyKind::Text => ExprKind::Builtin(Builtin::Text),
TyKind::Optional(t) => ExprKind::App(
hir(ExprKind::Builtin(Builtin::Optional)),
t.to_hir(),
),
TyKind::List(t) => {
ExprKind::App(hir(ExprKind::Builtin(Builtin::List)), t.to_hir())
}
TyKind::Record(kts) => ExprKind::RecordType(
kts.into_iter()
.map(|(k, t)| (k.as_str().into(), t.to_hir()))
.collect(),
),
TyKind::Union(kts) => ExprKind::UnionType(
kts.into_iter()
.map(|(k, t)| {
(k.as_str().into(), t.as_ref().map(|t| t.to_hir()))
})
.collect(),
),
})
}
}
impl Sealed for Value {}
impl Deserialize for Value {
fn from_dhall(v: &crate::value::Value) -> Result<Self> {
v.to_simple_value().ok_or_else(|| {
Error::Deserialize(format!(
"this cannot be deserialized into a simple type: {}",
v
))
})
}
}
impl Sealed for Type {}
impl Deserialize for Type {
fn from_dhall(v: &crate::value::Value) -> Result<Self> {
v.to_simple_type().ok_or_else(|| {
Error::Deserialize(format!(
"this cannot be deserialized into a simple type: {}",
v
))
})
}
}
impl From<TyKind> for Type {
fn from(x: TyKind) -> Type {
Type::new(x)
}
}
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