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|
use crate::expr::*;
use crate::traits::StaticType;
use crate::typecheck::{TypeError, TypeMessage};
use dhall_core::context::Context;
use dhall_core::{Const, ExprF};
use std::borrow::Cow;
pub trait DynamicType {
fn get_type<'a>(&'a self) -> Result<Cow<'a, Type>, TypeError>;
}
impl<T: StaticType> DynamicType for T {
fn get_type<'a>(&'a self) -> Result<Cow<'a, Type>, TypeError> {
Ok(Cow::Owned(T::get_static_type()))
}
}
impl DynamicType for Type {
fn get_type(&self) -> Result<Cow<'_, Type>, TypeError> {
use TypeInternal::*;
match &self.0 {
Expr(e) => e.get_type(),
SuperType => Err(TypeError::new(
&Context::new(),
dhall_core::rc(ExprF::Const(Const::Sort)),
TypeMessage::Untyped,
)),
}
}
}
impl DynamicType for Normalized {
fn get_type(&self) -> Result<Cow<'_, Type>, TypeError> {
match &self.1 {
Some(t) => Ok(Cow::Borrowed(t)),
None => Err(TypeError::new(
&Context::new(),
self.0.absurd(),
TypeMessage::Untyped,
)),
}
}
}
impl DynamicType for Typed {
fn get_type(&self) -> Result<Cow<'_, Type>, TypeError> {
match &self.1 {
Some(t) => Ok(Cow::Borrowed(t)),
None => Err(TypeError::new(
&Context::new(),
self.0.clone(),
TypeMessage::Untyped,
)),
}
}
}
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