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#![allow(dead_code)]
use crate::error::{TypeError, TypeMessage};
use crate::semantics::core::var::AlphaVar;
use crate::semantics::phase::normalize::{normalize_tyexpr_whnf, NzEnv};
use crate::semantics::phase::typecheck::rc;
use crate::semantics::phase::Normalized;
use crate::semantics::phase::{NormalizedExpr, ToExprOptions};
use crate::semantics::tck::typecheck::TyEnv;
use crate::semantics::Value;
use crate::syntax::{ExprKind, Label, Span, V};
pub(crate) type Type = Value;
// An expression with inferred types at every node and resolved variables.
#[derive(Debug, Clone)]
pub(crate) struct TyExpr {
kind: Box<TyExprKind>,
ty: Option<Type>,
span: Span,
}
#[derive(Debug, Clone)]
pub(crate) enum TyExprKind {
Var(AlphaVar),
// Forbidden ExprKind variants: Var, Import, Embed
Expr(ExprKind<TyExpr, Normalized>),
}
impl TyExpr {
pub fn new(kind: TyExprKind, ty: Option<Type>, span: Span) -> Self {
TyExpr {
kind: Box::new(kind),
ty,
span,
}
}
pub fn kind(&self) -> &TyExprKind {
&*self.kind
}
pub fn get_type(&self) -> Result<Type, TypeError> {
match &self.ty {
Some(t) => Ok(t.clone()),
None => Err(TypeError::new(TypeMessage::Sort)),
}
}
/// Converts a value back to the corresponding AST expression.
pub fn to_expr(&self, opts: ToExprOptions) -> NormalizedExpr {
tyexpr_to_expr(self, opts, &mut Vec::new())
}
pub fn to_expr_tyenv(&self, env: &TyEnv) -> NormalizedExpr {
let opts = ToExprOptions {
normalize: true,
alpha: false,
};
let env = env.as_nameenv().names();
let mut env = env.iter().collect();
tyexpr_to_expr(self, opts, &mut env)
}
// TODO: temporary hack
pub fn to_value(&self) -> Value {
todo!()
}
pub fn normalize_whnf(&self, env: &NzEnv) -> Value {
normalize_tyexpr_whnf(self, env)
}
pub fn normalize_whnf_noenv(&self) -> Value {
normalize_tyexpr_whnf(self, &NzEnv::new())
}
}
fn tyexpr_to_expr<'a>(
tyexpr: &'a TyExpr,
opts: ToExprOptions,
ctx: &mut Vec<&'a Label>,
) -> NormalizedExpr {
rc(match tyexpr.kind() {
TyExprKind::Var(v) if opts.alpha => {
ExprKind::Var(V("_".into(), v.idx()))
}
TyExprKind::Var(v) => {
let name = ctx[ctx.len() - 1 - v.idx()];
let idx = ctx
.iter()
.rev()
.take(v.idx())
.filter(|l| **l == name)
.count();
ExprKind::Var(V(name.clone(), idx))
}
TyExprKind::Expr(e) => {
let e = e.map_ref_maybe_binder(|l, tye| {
if let Some(l) = l {
ctx.push(l);
}
let e = tyexpr_to_expr(tye, opts, ctx);
if let Some(_) = l {
ctx.pop();
}
e
});
match e {
ExprKind::Lam(_, t, e) if opts.alpha => {
ExprKind::Lam("_".into(), t, e)
}
ExprKind::Pi(_, t, e) if opts.alpha => {
ExprKind::Pi("_".into(), t, e)
}
e => e,
}
}
})
}
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