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|
use crate::expr::*;
use dhall_core::*;
use dhall_generator::*;
use std::borrow::Cow;
#[derive(Debug, Clone)]
pub enum ConversionError {}
pub trait StaticType {
fn get_static_type() -> Type;
}
/// Trait for rust types that can be represented in dhall in
/// a single way, independent of the value. A typical example is `Option<bool>`,
/// represented by the dhall expression `Optional Bool`. A typical counterexample
/// is `HashMap<Text, bool>` because dhall cannot represent records with a
/// variable number of fields.
pub trait SimpleStaticType {
fn get_simple_static_type() -> SimpleType;
}
pub type Error = ();
pub type Result<T> = std::result::Result<T, Error>;
pub trait Deserialize<'a>: Sized {
fn from_str(s: &'a str, ty: Option<&Type>) -> Result<Self>;
}
impl<'a> Deserialize<'a> for Parsed {
/// Simply parses the provided string. Ignores the
/// provided type.
fn from_str(s: &'a str, _ty: Option<&Type>) -> Result<Self> {
Ok(Parsed::parse_str(s).map_err(|_| ())?)
}
}
impl<'a> Deserialize<'a> for Resolved {
/// Parses and resolves the provided string. Ignores the
/// provided type.
fn from_str(s: &'a str, ty: Option<&Type>) -> Result<Self> {
Ok(Parsed::from_str(s, ty)?
.resolve()
.map_err(|_| ())?
)
}
}
impl<'a> Deserialize<'a> for Typed {
/// Parses, resolves and typechecks the provided string.
fn from_str(s: &'a str, ty: Option<&Type>) -> Result<Self> {
// TODO: compare with provided type
Ok(Resolved::from_str(s, ty)?
.typecheck()
.map_err(|_| ())?
)
}
}
impl<'a> Deserialize<'a> for Normalized {
/// Parses, resolves, typechecks and normalizes the provided string.
fn from_str(s: &'a str, ty: Option<&Type>) -> Result<Self> {
Ok(Typed::from_str(s, ty)?.normalize())
}
}
impl<'a> Deserialize<'a> for Type {
fn from_str(s: &'a str, ty: Option<&Type>) -> Result<Self> {
Ok(Normalized::from_str(s, ty)?.into_type())
}
}
fn mktype(x: SubExpr<X, X>) -> SimpleType {
SimpleType(x)
}
impl<T: SimpleStaticType> StaticType for T {
fn get_static_type() -> Type {
crate::expr::Normalized(
T::get_simple_static_type().into(),
Type::const_type(),
)
.into_type()
}
}
impl StaticType for SimpleType {
fn get_static_type() -> Type {
Type::const_type()
}
}
impl SimpleStaticType for bool {
fn get_simple_static_type() -> SimpleType {
mktype(dhall_expr!(Bool))
}
}
impl SimpleStaticType for Natural {
fn get_simple_static_type() -> SimpleType {
mktype(dhall_expr!(Natural))
}
}
impl SimpleStaticType for Integer {
fn get_simple_static_type() -> SimpleType {
mktype(dhall_expr!(Integer))
}
}
impl SimpleStaticType for String {
fn get_simple_static_type() -> SimpleType {
mktype(dhall_expr!(Text))
}
}
impl<A: SimpleStaticType, B: SimpleStaticType> SimpleStaticType for (A, B) {
fn get_simple_static_type() -> SimpleType {
let ta: SubExpr<_, _> = A::get_simple_static_type().into();
let tb: SubExpr<_, _> = B::get_simple_static_type().into();
mktype(dhall_expr!({ _1: ta, _2: tb }))
}
}
impl<T: SimpleStaticType> SimpleStaticType for Option<T> {
fn get_simple_static_type() -> SimpleType {
let t: SubExpr<_, _> = T::get_simple_static_type().into();
mktype(dhall_expr!(Optional t))
}
}
impl<T: SimpleStaticType> SimpleStaticType for Vec<T> {
fn get_simple_static_type() -> SimpleType {
let t: SubExpr<_, _> = T::get_simple_static_type().into();
mktype(dhall_expr!(List t))
}
}
impl<'a, T: SimpleStaticType> SimpleStaticType for &'a T {
fn get_simple_static_type() -> SimpleType {
T::get_simple_static_type()
}
}
impl<T> SimpleStaticType for std::marker::PhantomData<T> {
fn get_simple_static_type() -> SimpleType {
mktype(dhall_expr!({}))
}
}
impl<T: SimpleStaticType, E: SimpleStaticType> SimpleStaticType
for std::result::Result<T, E>
{
fn get_simple_static_type() -> SimpleType {
let tt: SubExpr<_, _> = T::get_simple_static_type().into();
let te: SubExpr<_, _> = E::get_simple_static_type().into();
mktype(dhall_expr!(< Ok: tt | Err: te>))
}
}
|
