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-rw-r--r--dhall/src/core/thunk.rs10
-rw-r--r--dhall/src/core/value.rs14
-rw-r--r--dhall/src/error/mod.rs8
-rw-r--r--dhall/src/phase/binary.rs91
-rw-r--r--dhall/src/phase/mod.rs26
-rw-r--r--dhall/src/phase/normalize.rs25
-rw-r--r--dhall/src/phase/resolve.rs8
-rw-r--r--dhall/src/phase/typecheck.rs17
8 files changed, 101 insertions, 98 deletions
diff --git a/dhall/src/core/thunk.rs b/dhall/src/core/thunk.rs
index c18014e..7c5c537 100644
--- a/dhall/src/core/thunk.rs
+++ b/dhall/src/core/thunk.rs
@@ -2,7 +2,7 @@ use std::borrow::Cow;
use std::cell::{Ref, RefCell};
use std::rc::Rc;
-use dhall_syntax::{Const, ExprF, X};
+use dhall_syntax::{Const, ExprF};
use crate::core::context::{NormalizationContext, TypecheckContext};
use crate::core::value::Value;
@@ -12,7 +12,7 @@ use crate::phase::normalize::{
apply_any, normalize_one_layer, normalize_whnf, InputSubExpr, OutputSubExpr,
};
use crate::phase::typecheck::type_of_const;
-use crate::phase::{NormalizedSubExpr, Type, Typed};
+use crate::phase::{Normalized, NormalizedSubExpr, Type, Typed};
#[derive(Debug, Clone, Copy)]
enum Marker {
@@ -30,7 +30,7 @@ enum ThunkInternal {
/// Partially normalized value whose subexpressions have been thunked (this is returned from
/// typechecking). Note that this is different from `Value::PartialExpr` because there is no
/// requirement of WHNF here.
- PartialExpr(ExprF<Thunk, X>),
+ PartialExpr(ExprF<Thunk, Normalized>),
/// Partially normalized value.
/// Invariant: if the marker is `NF`, the value must be fully normalized
Value(Marker, Value),
@@ -123,7 +123,7 @@ impl Thunk {
ThunkInternal::Value(WHNF, v).into_thunk()
}
- pub fn from_partial_expr(e: ExprF<Thunk, X>) -> Thunk {
+ pub fn from_partial_expr(e: ExprF<Thunk, Normalized>) -> Thunk {
ThunkInternal::PartialExpr(e).into_thunk()
}
@@ -309,7 +309,6 @@ impl Shift for ThunkInternal {
e.traverse_ref_with_special_handling_of_binders(
|v| Ok(v.shift(delta, var)?),
|x, v| Ok(v.shift(delta, &var.under_binder(x))?),
- |x| Ok(X::clone(x)),
)?,
),
ThunkInternal::Value(m, v) => {
@@ -356,7 +355,6 @@ impl Subst<Typed> for ThunkInternal {
&val.under_binder(x),
)
},
- X::clone,
),
),
ThunkInternal::Value(_, v) => {
diff --git a/dhall/src/core/value.rs b/dhall/src/core/value.rs
index 8486d6e..20a6021 100644
--- a/dhall/src/core/value.rs
+++ b/dhall/src/core/value.rs
@@ -2,7 +2,7 @@ use std::collections::HashMap;
use dhall_syntax::{
rc, Builtin, Const, ExprF, Integer, InterpolatedTextContents, Label,
- NaiveDouble, Natural, X,
+ NaiveDouble, Natural,
};
use crate::core::thunk::{Thunk, TypedThunk};
@@ -10,7 +10,7 @@ use crate::core::var::{AlphaLabel, AlphaVar, Shift, Subst};
use crate::phase::normalize::{
apply_builtin, normalize_one_layer, squash_textlit, OutputSubExpr,
};
-use crate::phase::Typed;
+use crate::phase::{Normalized, Typed};
/// A semantic value. The invariants ensure this value represents a Weak-Head
/// Normal Form (WHNF). This means that this first constructor is the first constructor of the
@@ -59,7 +59,7 @@ pub enum Value {
TextLit(Vec<InterpolatedTextContents<Thunk>>),
Equivalence(TypedThunk, TypedThunk),
// Invariant: this must not contain a value captured by one of the variants above.
- PartialExpr(ExprF<Thunk, X>),
+ PartialExpr(ExprF<Thunk, Normalized>),
}
impl Value {
@@ -243,7 +243,7 @@ impl Value {
y.normalize_to_expr_maybe_alpha(alpha),
)),
Value::PartialExpr(e) => {
- rc(e.map_ref_simple(|v| v.normalize_to_expr_maybe_alpha(alpha)))
+ rc(e.map_ref(|v| v.normalize_to_expr_maybe_alpha(alpha)))
}
}
}
@@ -333,8 +333,8 @@ impl Value {
y.normalize_mut();
}
Value::PartialExpr(e) => {
- // TODO: need map_mut_simple
- e.map_ref_simple(|v| {
+ // TODO: need map_mut
+ e.map_ref(|v| {
v.normalize_nf();
});
}
@@ -475,7 +475,6 @@ impl Shift for Value {
e.traverse_ref_with_special_handling_of_binders(
|v| Ok(v.shift(delta, var)?),
|x, v| Ok(v.shift(delta, &var.under_binder(x))?),
- |x| Ok(X::clone(x)),
)?,
),
})
@@ -500,7 +499,6 @@ impl Subst<Typed> for Value {
&val.under_binder(x),
)
},
- X::clone,
))
}
// Retry normalizing since substituting may allow progress
diff --git a/dhall/src/error/mod.rs b/dhall/src/error/mod.rs
index 3626d96..8f6ff51 100644
--- a/dhall/src/error/mod.rs
+++ b/dhall/src/error/mod.rs
@@ -4,7 +4,7 @@ use dhall_syntax::{BinOp, Import, Label, ParseError, V};
use crate::core::context::TypecheckContext;
use crate::phase::resolve::ImportStack;
-use crate::phase::{Normalized, Type, Typed};
+use crate::phase::{Normalized, NormalizedSubExpr, Type, Typed};
pub type Result<T> = std::result::Result<T, Error>;
@@ -21,9 +21,9 @@ pub enum Error {
#[derive(Debug)]
pub enum ImportError {
- Recursive(Import, Box<Error>),
- UnexpectedImport(Import),
- ImportCycle(ImportStack, Import),
+ Recursive(Import<NormalizedSubExpr>, Box<Error>),
+ UnexpectedImport(Import<NormalizedSubExpr>),
+ ImportCycle(ImportStack, Import<NormalizedSubExpr>),
}
#[derive(Debug)]
diff --git a/dhall/src/phase/binary.rs b/dhall/src/phase/binary.rs
index 3292617..36dd471 100644
--- a/dhall/src/phase/binary.rs
+++ b/dhall/src/phase/binary.rs
@@ -4,13 +4,12 @@ use std::iter::FromIterator;
use dhall_syntax::map::DupTreeMap;
use dhall_syntax::{
- rc, ExprF, FilePrefix, Hash, Import, ImportHashed, ImportLocation,
- ImportMode, Integer, InterpolatedText, Label, Natural, Scheme, SubExpr,
- URL, V,
+ rc, ExprF, FilePrefix, Hash, Import, ImportLocation, ImportMode, Integer,
+ InterpolatedText, Label, Natural, Scheme, SubExpr, URL, V,
};
use crate::error::{DecodeError, EncodeError};
-use crate::phase::{DecodedSubExpr, ParsedSubExpr};
+use crate::phase::DecodedSubExpr;
pub fn decode(data: &[u8]) -> Result<DecodedSubExpr, DecodeError> {
match serde_cbor::de::from_slice(data) {
@@ -19,8 +18,7 @@ pub fn decode(data: &[u8]) -> Result<DecodedSubExpr, DecodeError> {
}
}
-//TODO: encode normalized expression too
-pub fn encode(expr: &ParsedSubExpr) -> Result<Vec<u8>, EncodeError> {
+pub fn encode<E>(expr: &SubExpr<E>) -> Result<Vec<u8>, EncodeError> {
serde_cbor::ser::to_vec(&Serialize::Expr(expr))
.map_err(|e| EncodeError::CBORError(e))
}
@@ -261,20 +259,12 @@ fn cbor_value_to_dhall(
};
let headers = match rest.next() {
Some(Null) => None,
- // TODO
- // Some(x) => {
- // match cbor_value_to_dhall(&x)?.as_ref() {
- // Embed(import) => Some(Box::new(
- // import.location_hashed.clone(),
- // )),
- // _ => Err(DecodeError::WrongFormatError(
- // "import/remote/headers".to_owned(),
- // ))?,
- // }
- // }
+ Some(x) => {
+ let x = cbor_value_to_dhall(&x)?;
+ Some(x)
+ }
_ => Err(DecodeError::WrongFormatError(
- "import/remote/headers is unimplemented"
- .to_owned(),
+ "import/remote/headers".to_owned(),
))?,
};
let authority = match rest.next() {
@@ -340,9 +330,10 @@ fn cbor_value_to_dhall(
"import/type".to_owned(),
))?,
};
- Embed(Import {
+ Import(dhall_syntax::Import {
mode,
- location_hashed: ImportHashed { hash, location },
+ hash,
+ location,
})
}
[U64(25), bindings..] => {
@@ -424,11 +415,11 @@ where
.collect::<Result<_, _>>()
}
-enum Serialize<'a> {
- Expr(&'a ParsedSubExpr),
+enum Serialize<'a, E> {
+ Expr(&'a SubExpr<E>),
CBOR(cbor::Value),
- RecordMap(&'a DupTreeMap<Label, ParsedSubExpr>),
- UnionMap(&'a DupTreeMap<Label, Option<ParsedSubExpr>>),
+ RecordMap(&'a DupTreeMap<Label, SubExpr<E>>),
+ UnionMap(&'a DupTreeMap<Label, Option<SubExpr<E>>>),
}
macro_rules! count {
@@ -448,7 +439,7 @@ macro_rules! ser_seq {
}};
}
-fn serialize_subexpr<S>(ser: S, e: &ParsedSubExpr) -> Result<S::Ok, S::Error>
+fn serialize_subexpr<S, E>(ser: S, e: &SubExpr<E>) -> Result<S::Ok, S::Error>
where
S: serde::ser::Serializer,
{
@@ -458,21 +449,14 @@ where
use std::iter::once;
use self::Serialize::{RecordMap, UnionMap};
- fn expr(x: &ParsedSubExpr) -> self::Serialize<'_> {
+ fn expr<E>(x: &SubExpr<E>) -> self::Serialize<'_, E> {
self::Serialize::Expr(x)
}
- fn cbor<'a>(v: cbor::Value) -> self::Serialize<'a> {
- self::Serialize::CBOR(v)
- }
- fn tag<'a>(x: u64) -> self::Serialize<'a> {
- cbor(U64(x))
- }
- fn null<'a>() -> self::Serialize<'a> {
- cbor(cbor::Value::Null)
- }
- fn label<'a>(l: &Label) -> self::Serialize<'a> {
- cbor(cbor::Value::String(l.into()))
- }
+ let cbor =
+ |v: cbor::Value| -> self::Serialize<'_, E> { self::Serialize::CBOR(v) };
+ let tag = |x: u64| cbor(U64(x));
+ let null = || cbor(cbor::Value::Null);
+ let label = |l: &Label| cbor(cbor::Value::String(l.into()));
match e.as_ref() {
Const(c) => ser.serialize_str(&c.to_string()),
@@ -573,18 +557,24 @@ where
.chain(once(expr(x)))
.chain(ls.iter().map(label)),
),
- Embed(import) => serialize_import(ser, import),
+ Import(import) => serialize_import(ser, import),
+ Embed(_) => unimplemented!(
+ "An expression with resolved imports cannot be binary-encoded"
+ ),
}
}
-fn serialize_import<S>(ser: S, import: &Import) -> Result<S::Ok, S::Error>
+fn serialize_import<S, E>(
+ ser: S,
+ import: &Import<SubExpr<E>>,
+) -> Result<S::Ok, S::Error>
where
S: serde::ser::Serializer,
{
use cbor::Value::{Bytes, Null, U64};
use serde::ser::SerializeSeq;
- let count = 4 + match &import.location_hashed.location {
+ let count = 4 + match &import.location {
ImportLocation::Remote(url) => 3 + url.path.len(),
ImportLocation::Local(_, path) => path.len(),
ImportLocation::Env(_) => 1,
@@ -594,7 +584,7 @@ where
ser_seq.serialize_element(&U64(24))?;
- let hash = match &import.location_hashed.hash {
+ let hash = match &import.hash {
None => Null,
Some(Hash::SHA256(h)) => {
let mut bytes = vec![18, 32];
@@ -611,7 +601,7 @@ where
};
ser_seq.serialize_element(&U64(mode))?;
- let scheme = match &import.location_hashed.location {
+ let scheme = match &import.location {
ImportLocation::Remote(url) => match url.scheme {
Scheme::HTTP => 0,
Scheme::HTTPS => 1,
@@ -627,16 +617,13 @@ where
};
ser_seq.serialize_element(&U64(scheme))?;
- match &import.location_hashed.location {
+ match &import.location {
ImportLocation::Remote(url) => {
match &url.headers {
None => ser_seq.serialize_element(&Null)?,
- Some(location_hashed) => ser_seq.serialize_element(
- &self::Serialize::Expr(&rc(ExprF::Embed(Import {
- mode: ImportMode::Code,
- location_hashed: location_hashed.as_ref().clone(),
- }))),
- )?,
+ Some(e) => {
+ ser_seq.serialize_element(&self::Serialize::Expr(e))?
+ }
};
ser_seq.serialize_element(&url.authority)?;
for p in &url.path {
@@ -661,7 +648,7 @@ where
ser_seq.end()
}
-impl<'a> serde::ser::Serialize for Serialize<'a> {
+impl<'a, E> serde::ser::Serialize for Serialize<'a, E> {
fn serialize<S>(&self, ser: S) -> Result<S::Ok, S::Error>
where
S: serde::ser::Serializer,
diff --git a/dhall/src/phase/mod.rs b/dhall/src/phase/mod.rs
index 8c93889..b73597c 100644
--- a/dhall/src/phase/mod.rs
+++ b/dhall/src/phase/mod.rs
@@ -2,7 +2,7 @@ use std::borrow::Cow;
use std::fmt::Display;
use std::path::Path;
-use dhall_syntax::{Const, Import, SubExpr, X};
+use dhall_syntax::{Const, SubExpr, Void};
use crate::core::thunk::{Thunk, TypedThunk};
use crate::core::value::Value;
@@ -17,15 +17,17 @@ pub(crate) mod parse;
pub(crate) mod resolve;
pub(crate) mod typecheck;
-pub type ParsedSubExpr = SubExpr<Import>;
-pub type DecodedSubExpr = SubExpr<Import>;
+pub type ParsedSubExpr = SubExpr<Void>;
+pub type DecodedSubExpr = SubExpr<Void>;
pub type ResolvedSubExpr = SubExpr<Normalized>;
-pub type NormalizedSubExpr = SubExpr<X>;
+pub type NormalizedSubExpr = SubExpr<Normalized>;
#[derive(Debug, Clone)]
pub struct Parsed(ParsedSubExpr, ImportRoot);
/// An expression where all imports have been resolved
+///
+/// Invariant: there must be no `Import` nodes or `ImportAlt` operations left.
#[derive(Debug, Clone)]
pub struct Resolved(ResolvedSubExpr);
@@ -155,6 +157,10 @@ impl Typed {
}
impl Normalized {
+ pub fn encode(&self) -> Result<Vec<u8>, EncodeError> {
+ crate::phase::binary::encode(&self.to_expr())
+ }
+
#[allow(dead_code)]
pub fn to_expr(&self) -> NormalizedSubExpr {
self.0.to_expr()
@@ -218,6 +224,18 @@ derive_traits_for_wrapper_struct!(Parsed);
derive_traits_for_wrapper_struct!(Resolved);
derive_traits_for_wrapper_struct!(Normalized);
+impl std::hash::Hash for Normalized {
+ fn hash<H>(&self, state: &mut H)
+ where
+ H: std::hash::Hasher,
+ {
+ match self.encode() {
+ Ok(vec) => vec.hash(state),
+ Err(_) => {}
+ }
+ }
+}
+
impl Eq for Typed {}
impl PartialEq for Typed {
fn eq(&self, other: &Self) -> bool {
diff --git a/dhall/src/phase/normalize.rs b/dhall/src/phase/normalize.rs
index 644f98c..adbcb02 100644
--- a/dhall/src/phase/normalize.rs
+++ b/dhall/src/phase/normalize.rs
@@ -2,14 +2,14 @@ use std::collections::HashMap;
use dhall_syntax::{
BinOp, Builtin, ExprF, InterpolatedText, InterpolatedTextContents,
- NaiveDouble, X,
+ NaiveDouble,
};
use crate::core::context::NormalizationContext;
use crate::core::thunk::{Thunk, TypedThunk};
use crate::core::value::Value;
use crate::core::var::Subst;
-use crate::phase::{NormalizedSubExpr, ResolvedSubExpr, Typed};
+use crate::phase::{Normalized, NormalizedSubExpr, ResolvedSubExpr, Typed};
pub type InputSubExpr = ResolvedSubExpr;
pub type OutputSubExpr = NormalizedSubExpr;
@@ -86,7 +86,7 @@ pub fn apply_builtin(b: Builtin, args: Vec<Thunk>) -> Value {
// Empty string literal.
[] => {
// Printing InterpolatedText takes care of all the escaping
- let txt: InterpolatedText<X> =
+ let txt: InterpolatedText<Normalized> =
std::iter::empty().collect();
let s = txt.to_string();
Ok((
@@ -98,10 +98,11 @@ pub fn apply_builtin(b: Builtin, args: Vec<Thunk>) -> Value {
// interpolations, there is a single Text item) in the literal.
[InterpolatedTextContents::Text(s)] => {
// Printing InterpolatedText takes care of all the escaping
- let txt: InterpolatedText<X> = std::iter::once(
- InterpolatedTextContents::Text(s.clone()),
- )
- .collect();
+ let txt: InterpolatedText<Normalized> =
+ std::iter::once(InterpolatedTextContents::Text(
+ s.clone(),
+ ))
+ .collect();
let s = txt.to_string();
Ok((
r,
@@ -376,11 +377,10 @@ pub fn normalize_whnf(ctx: NormalizationContext, expr: InputSubExpr) -> Value {
}
// Thunk subexpressions
- let expr: ExprF<Thunk, X> =
+ let expr: ExprF<Thunk, Normalized> =
expr.as_ref().map_ref_with_special_handling_of_binders(
|e| Thunk::new(ctx.clone(), e.clone()),
|x, e| Thunk::new(ctx.skip(x), e.clone()),
- |_| unreachable!(),
);
normalize_one_layer(expr)
@@ -391,7 +391,7 @@ enum Ret<'a> {
Value(Value),
Thunk(Thunk),
ThunkRef(&'a Thunk),
- Expr(ExprF<Thunk, X>),
+ Expr(ExprF<Thunk, Normalized>),
}
/// Performs an intersection of two HashMaps.
@@ -636,7 +636,7 @@ fn apply_binop<'a>(o: BinOp, x: &'a Thunk, y: &'a Thunk) -> Option<Ret<'a>> {
})
}
-pub fn normalize_one_layer(expr: ExprF<Thunk, X>) -> Value {
+pub fn normalize_one_layer(expr: ExprF<Thunk, Normalized>) -> Value {
use Value::{
AppliedBuiltin, BoolLit, DoubleLit, EmptyListLit, IntegerLit, Lam,
NEListLit, NEOptionalLit, NaturalLit, Pi, RecordLit, RecordType,
@@ -644,6 +644,9 @@ pub fn normalize_one_layer(expr: ExprF<Thunk, X>) -> Value {
};
let ret = match expr {
+ ExprF::Import(_) => unreachable!(
+ "There should remain no imports in a resolved expression"
+ ),
ExprF::Embed(_) => unreachable!(),
ExprF::Var(_) => unreachable!(),
ExprF::Annot(x, _) => Ret::Thunk(x),
diff --git a/dhall/src/phase/resolve.rs b/dhall/src/phase/resolve.rs
index abcee7e..52353e4 100644
--- a/dhall/src/phase/resolve.rs
+++ b/dhall/src/phase/resolve.rs
@@ -1,10 +1,10 @@
use std::collections::HashMap;
use std::path::{Path, PathBuf};
-use dhall_syntax::Import;
-
use crate::error::{Error, ImportError};
-use crate::phase::{Normalized, Parsed, Resolved};
+use crate::phase::{Normalized, NormalizedSubExpr, Parsed, Resolved};
+
+type Import = dhall_syntax::Import<NormalizedSubExpr>;
/// A root from which to resolve relative imports.
#[derive(Debug, Clone, PartialEq, Eq)]
@@ -28,7 +28,7 @@ fn resolve_import(
let cwd = match root {
LocalDir(cwd) => cwd,
};
- match &import.location_hashed.location {
+ match &import.location {
Local(prefix, path) => {
let path: PathBuf = path.iter().cloned().collect();
let path = match prefix {
diff --git a/dhall/src/phase/typecheck.rs b/dhall/src/phase/typecheck.rs
index ecf9793..89e2da8 100644
--- a/dhall/src/phase/typecheck.rs
+++ b/dhall/src/phase/typecheck.rs
@@ -2,7 +2,6 @@ use std::collections::HashMap;
use dhall_syntax::{
rc, Builtin, Const, Expr, ExprF, InterpolatedTextContents, Label, SubExpr,
- X,
};
use crate::core::context::{NormalizationContext, TypecheckContext};
@@ -214,7 +213,7 @@ macro_rules! make_type {
};
}
-fn type_of_builtin(b: Builtin) -> Expr<X> {
+fn type_of_builtin<E>(b: Builtin) -> Expr<E> {
use dhall_syntax::Builtin::*;
match b {
Bool | Natural | Integer | Double | Text => make_type!(Type),
@@ -377,12 +376,11 @@ fn type_with(
e.as_ref().traverse_ref_with_special_handling_of_binders(
|e| type_with(ctx, e.clone()),
|_, _| unreachable!(),
- |_| unreachable!(),
)?;
let ret = type_last_layer(ctx, &expr)?;
match ret {
RetTypeOnly(typ) => {
- let expr = expr.map_ref_simple(|typed| typed.to_thunk());
+ let expr = expr.map_ref(|typed| typed.to_thunk());
Typed::from_thunk_and_type(
Thunk::from_partial_expr(expr),
typ,
@@ -398,7 +396,7 @@ fn type_with(
/// layer.
fn type_last_layer(
ctx: &TypecheckContext,
- e: &ExprF<Typed, X>,
+ e: &ExprF<Typed, Normalized>,
) -> Result<Ret, TypeError> {
use crate::error::TypeMessage::*;
use dhall_syntax::BinOp::*;
@@ -409,6 +407,9 @@ fn type_last_layer(
let mkerr = |msg: TypeMessage| TypeError::new(ctx, msg);
match e {
+ Import(_) => unreachable!(
+ "There should remain no imports in a resolved expression"
+ ),
Lam(_, _, _) | Pi(_, _, _) | Let(_, _, _, _) | Embed(_) | Var(_) => {
unreachable!()
}
@@ -598,9 +599,7 @@ fn type_last_layer(
}
}
Const(c) => Ok(RetWhole(Typed::from_const(*c))),
- Builtin(b) => {
- Ok(RetTypeOnly(mktype(ctx, rc(type_of_builtin(*b)).absurd())?))
- }
+ Builtin(b) => Ok(RetTypeOnly(mktype(ctx, rc(type_of_builtin(*b)))?)),
BoolLit(_) => Ok(RetTypeOnly(builtin_to_type(Bool)?)),
NaturalLit(_) => Ok(RetTypeOnly(builtin_to_type(Natural)?)),
IntegerLit(_) => Ok(RetTypeOnly(builtin_to_type(Integer)?)),
@@ -1016,7 +1015,7 @@ pub fn typecheck(e: Resolved) -> Result<Typed, TypeError> {
pub fn typecheck_with(e: Resolved, ty: &Type) -> Result<Typed, TypeError> {
let expr: SubExpr<_> = e.0;
- let ty: SubExpr<_> = ty.to_expr().absurd();
+ let ty: SubExpr<_> = ty.to_expr();
type_of(expr.rewrap(ExprF::Annot(expr.clone(), ty)))
}
pub fn skip_typecheck(e: Resolved) -> Typed {
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-24 17:33:20 +0000