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-rw-r--r--dhall/src/normalize.rs80
1 files changed, 40 insertions, 40 deletions
diff --git a/dhall/src/normalize.rs b/dhall/src/normalize.rs
index 0381f38..488885a 100644
--- a/dhall/src/normalize.rs
+++ b/dhall/src/normalize.rs
@@ -1,5 +1,6 @@
#![allow(non_snake_case)]
use std::collections::BTreeMap;
+use std::rc::Rc;
use dhall_core::context::Context;
use dhall_core::*;
@@ -26,7 +27,7 @@ impl<'a> Typed<'a> {
}
fn apply_builtin(
- ctx: &NormalizationContext,
+ ctx: NormalizationContext,
b: Builtin,
args: &[WHNF],
) -> Option<WHNF> {
@@ -72,7 +73,7 @@ fn apply_builtin(
// TODO: avoid passing through Exprs
let t = now_to_expr(t);
EmptyListLit(Now::new(
- ctx.clone(),
+ ctx,
dhall::subexpr!({ index : Natural, value : t }),
))
}
@@ -200,17 +201,19 @@ enum EnvItem {
}
#[derive(Debug, Clone)]
-struct NormalizationContext(Context<Label, EnvItem>);
+struct NormalizationContext(Rc<Context<Label, EnvItem>>);
impl NormalizationContext {
- fn new() -> NormalizationContext {
- NormalizationContext(Context::new())
+ fn new() -> Self {
+ NormalizationContext(Rc::new(Context::new()))
}
- fn insert(&self, x: &Label, e: WHNF) -> NormalizationContext {
- NormalizationContext(self.0.insert(x.clone(), EnvItem::Expr(e)))
+ fn insert(&self, x: &Label, e: WHNF) -> Self {
+ NormalizationContext(Rc::new(
+ self.0.insert(x.clone(), EnvItem::Expr(e)),
+ ))
}
- fn skip(&self, x: &Label) -> NormalizationContext {
- NormalizationContext(
+ fn skip(&self, x: &Label) -> Self {
+ NormalizationContext(Rc::new(
self.0
.map(|l, e| {
use EnvItem::*;
@@ -221,7 +224,7 @@ impl NormalizationContext {
}
})
.insert(x.clone(), EnvItem::Skip(0)),
- )
+ ))
}
fn lookup(&self, var: &V<Label>) -> WHNF {
let V(x, n) = var;
@@ -301,7 +304,8 @@ impl WHNF {
(
k,
v.map(|v| {
- normalize_whnf(&ctx, v).normalize_to_expr()
+ normalize_whnf(ctx.clone(), v)
+ .normalize_to_expr()
}),
)
})
@@ -315,7 +319,8 @@ impl WHNF {
(
k,
v.map(|v| {
- normalize_whnf(&kts_ctx, v).normalize_to_expr()
+ normalize_whnf(kts_ctx.clone(), v)
+ .normalize_to_expr()
}),
)
})
@@ -427,7 +432,7 @@ impl Now {
fn normalize(self) -> WHNF {
match self {
Now::Normalized(v) => *v,
- Now::Unnormalized(ctx, e) => normalize_whnf(&ctx, e),
+ Now::Unnormalized(ctx, e) => normalize_whnf(ctx, e),
}
}
@@ -460,11 +465,11 @@ impl Closure {
match self {
Closure::Lam(x, _, (ctx, e)) => {
let ctx2 = ctx.insert(&x, val);
- normalize_whnf(&ctx2, e)
+ normalize_whnf(ctx2, e)
}
Closure::AppliedBuiltin(ctx, b, mut args) => {
args.push(val);
- match apply_builtin(&ctx, b, &args) {
+ match apply_builtin(ctx.clone(), b, &args) {
Some(v) => v,
None => {
WHNF::Closure(Closure::AppliedBuiltin(ctx, b, args))
@@ -485,7 +490,7 @@ impl Closure {
rc(ExprF::Lam(
x.clone(),
t.normalize().normalize_to_expr(),
- normalize_whnf(&ctx2, e).normalize_to_expr(),
+ normalize_whnf(ctx2, e).normalize_to_expr(),
))
}
Closure::AppliedBuiltin(_ctx, b, args) => {
@@ -506,7 +511,8 @@ impl Closure {
(
k,
v.map(|v| {
- normalize_whnf(&ctx, v).normalize_to_expr()
+ normalize_whnf(ctx.clone(), v)
+ .normalize_to_expr()
}),
)
})
@@ -540,7 +546,7 @@ impl Closure {
}
/// Reduces the imput expression to WHNF. See doc on `WHNF` for details.
-fn normalize_whnf(ctx: &NormalizationContext, expr: InputSubExpr) -> WHNF {
+fn normalize_whnf(ctx: NormalizationContext, expr: InputSubExpr) -> WHNF {
let expr = match expr.as_ref() {
ExprF::Var(v) => return ctx.lookup(&v),
ExprF::Annot(x, _) => return normalize_whnf(ctx, x.clone()),
@@ -548,39 +554,35 @@ fn normalize_whnf(ctx: &NormalizationContext, expr: InputSubExpr) -> WHNF {
// TODO: wasteful to retraverse everything
ExprF::Embed(e) => return normalize_whnf(ctx, e.0.embed_absurd()),
ExprF::Let(x, _, r, b) => {
- let r = normalize_whnf(ctx, r.clone());
- return normalize_whnf(&ctx.insert(x, r), b.clone());
+ let r = normalize_whnf(ctx.clone(), r.clone());
+ return normalize_whnf(ctx.insert(x, r), b.clone());
}
ExprF::Lam(x, t, e) => {
return WHNF::Closure(Closure::Lam(
x.clone(),
Now::new(ctx.clone(), t.clone()),
- (ctx.clone(), e.clone()),
+ (ctx, e.clone()),
))
}
ExprF::Builtin(b) => {
- return WHNF::Closure(Closure::AppliedBuiltin(
- ctx.clone(),
- *b,
- vec![],
- ))
+ return WHNF::Closure(Closure::AppliedBuiltin(ctx, *b, vec![]))
}
ExprF::BoolLit(b) => return WHNF::BoolLit(*b),
ExprF::NaturalLit(n) => return WHNF::NaturalLit(*n),
ExprF::OldOptionalLit(None, e) => {
- return WHNF::EmptyOptionalLit(Now::new(ctx.clone(), e.clone()))
+ return WHNF::EmptyOptionalLit(Now::new(ctx, e.clone()))
}
ExprF::OldOptionalLit(Some(e), _) => {
- return WHNF::NEOptionalLit(Now::new(ctx.clone(), e.clone()))
+ return WHNF::NEOptionalLit(Now::new(ctx, e.clone()))
}
ExprF::EmptyOptionalLit(e) => {
- return WHNF::EmptyOptionalLit(Now::new(ctx.clone(), e.clone()))
+ return WHNF::EmptyOptionalLit(Now::new(ctx, e.clone()))
}
ExprF::NEOptionalLit(e) => {
- return WHNF::NEOptionalLit(Now::new(ctx.clone(), e.clone()))
+ return WHNF::NEOptionalLit(Now::new(ctx, e.clone()))
}
ExprF::EmptyListLit(e) => {
- return WHNF::EmptyListLit(Now::new(ctx.clone(), e.clone()))
+ return WHNF::EmptyListLit(Now::new(ctx, e.clone()))
}
ExprF::NEListLit(elts) => {
return WHNF::NEListLit(
@@ -596,14 +598,12 @@ fn normalize_whnf(ctx: &NormalizationContext, expr: InputSubExpr) -> WHNF {
.collect(),
)
}
- ExprF::UnionType(kvs) => {
- return WHNF::UnionType(ctx.clone(), kvs.clone())
- }
+ ExprF::UnionType(kvs) => return WHNF::UnionType(ctx, kvs.clone()),
ExprF::UnionLit(l, x, kts) => {
return WHNF::UnionLit(
l.clone(),
Now::new(ctx.clone(), x.clone()),
- (ctx.clone(), kts.clone()),
+ (ctx, kts.clone()),
)
}
ExprF::TextLit(elts) => {
@@ -620,7 +620,7 @@ fn normalize_whnf(ctx: &NormalizationContext, expr: InputSubExpr) -> WHNF {
)
}
ExprF::BoolIf(b, e1, e2) => {
- let b = normalize_whnf(ctx, b.clone());
+ let b = normalize_whnf(ctx.clone(), b.clone());
match b {
WHNF::BoolLit(true) => return normalize_whnf(ctx, e1.clone()),
WHNF::BoolLit(false) => return normalize_whnf(ctx, e2.clone()),
@@ -633,8 +633,8 @@ fn normalize_whnf(ctx: &NormalizationContext, expr: InputSubExpr) -> WHNF {
// Recursively normalize all subexpressions
let expr: ExprF<WHNF, Label, X, X> =
expr.as_ref().map_ref_with_special_handling_of_binders(
- |e| normalize_whnf(ctx, e.clone()),
- |x, e| normalize_whnf(&ctx.skip(x), e.clone()),
+ |e| normalize_whnf(ctx.clone(), e.clone()),
+ |x, e| normalize_whnf(ctx.skip(x), e.clone()),
X::clone,
|_| unreachable!(),
Label::clone,
@@ -645,7 +645,7 @@ fn normalize_whnf(ctx: &NormalizationContext, expr: InputSubExpr) -> WHNF {
/// When all sub-expressions have been (partially) normalized, eval the remaining toplevel layer.
fn normalize_last_layer(
- ctx: &NormalizationContext,
+ ctx: NormalizationContext,
expr: ExprF<WHNF, Label, X, X>,
) -> WHNF {
use dhall_core::BinOp::*;
@@ -768,7 +768,7 @@ fn normalize_last_layer(
/// leave ill-typed sub-expressions unevaluated.
///
fn normalize(e: InputSubExpr) -> OutputSubExpr {
- normalize_whnf(&NormalizationContext::new(), e).normalize_to_expr()
+ normalize_whnf(NormalizationContext::new(), e).normalize_to_expr()
}
#[cfg(test)]
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 22:20:26 +0000