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-rw-r--r--dhall/src/operations/kind.rs3
-rw-r--r--dhall/src/operations/normalization.rs2
-rw-r--r--dhall/src/operations/typecheck.rs2
-rw-r--r--dhall/src/semantics/resolve/resolve.rs32
-rw-r--r--dhall/src/syntax/ast/span.rs1
-rw-r--r--dhall/src/syntax/binary/decode.rs21
-rw-r--r--dhall/src/syntax/binary/encode.rs4
-rw-r--r--dhall/src/syntax/text/parser.rs26
-rw-r--r--dhall/src/syntax/text/printer.rs4
-rw-r--r--dhall/tests/parser/success/unit/WithB.txt2
-rw-r--r--dhall/tests/parser/success/unit/WithMultipleB.txt2
-rw-r--r--dhall/tests/parser/success/unit/WithPrecedence1B.txt2
-rw-r--r--dhall/tests/parser/success/unit/WithPrecedence2B.txt2
-rw-r--r--dhall/tests/parser/success/unit/WithPrecedence3B.txt2
-rw-r--r--dhall/tests/type-inference/failure/unit/WithInvalidOverrideA.txt6
15 files changed, 80 insertions, 31 deletions
diff --git a/dhall/src/operations/kind.rs b/dhall/src/operations/kind.rs
index 0ee9671..2b035ef 100644
--- a/dhall/src/operations/kind.rs
+++ b/dhall/src/operations/kind.rs
@@ -55,6 +55,8 @@ pub enum OpKind<SubExpr> {
ProjectionByExpr(SubExpr, SubExpr),
/// `x::y`
Completion(SubExpr, SubExpr),
+ /// `x with a.b.c = y`
+ With(SubExpr, Vec<Label>, SubExpr),
}
impl<SE> OpKind<SE> {
@@ -85,6 +87,7 @@ impl<SE> OpKind<SE> {
Projection(e, ls) => Projection(expr!(e), ls.clone()),
ProjectionByExpr(e, x) => ProjectionByExpr(expr!(e), expr!(x)),
Completion(e, x) => Completion(expr!(e), expr!(x)),
+ With(x, ls, y) => With(expr!(x), ls.clone(), expr!(y)),
})
}
diff --git a/dhall/src/operations/normalization.rs b/dhall/src/operations/normalization.rs
index 86fed13..b930f93 100644
--- a/dhall/src/operations/normalization.rs
+++ b/dhall/src/operations/normalization.rs
@@ -299,7 +299,7 @@ pub fn normalize_operation(opkind: &OpKind<Nir>) -> Ret {
)),
_ => nothing_to_do(),
},
- Completion(..) => {
+ Completion(..) | With(..) => {
unreachable!("This case should have been handled in resolution")
}
}
diff --git a/dhall/src/operations/typecheck.rs b/dhall/src/operations/typecheck.rs
index 314c587..2ccc17d 100644
--- a/dhall/src/operations/typecheck.rs
+++ b/dhall/src/operations/typecheck.rs
@@ -503,7 +503,7 @@ pub fn typecheck_operation(
selection_val
}
- Completion(..) => {
+ Completion(..) | With(..) => {
unreachable!("This case should have been handled in resolution")
}
})
diff --git a/dhall/src/semantics/resolve/resolve.rs b/dhall/src/semantics/resolve/resolve.rs
index 114bd9b..036e9a0 100644
--- a/dhall/src/semantics/resolve/resolve.rs
+++ b/dhall/src/semantics/resolve/resolve.rs
@@ -2,6 +2,7 @@ use itertools::Itertools;
use std::borrow::Cow;
use std::collections::BTreeMap;
use std::env;
+use std::iter::once;
use std::path::PathBuf;
use url::Url;
@@ -12,8 +13,8 @@ use crate::operations::{BinOp, OpKind};
use crate::semantics::{mkerr, Cache, Hir, HirKind, ImportEnv, NameEnv, Type};
use crate::syntax;
use crate::syntax::{
- Expr, ExprKind, FilePath, FilePrefix, Hash, ImportMode, ImportTarget, Span,
- UnspannedExpr, URL,
+ Expr, ExprKind, FilePath, FilePrefix, Hash, ImportMode, ImportTarget,
+ Label, Span, UnspannedExpr, URL,
};
use crate::{Parsed, Resolved};
@@ -276,6 +277,30 @@ fn resolve_one_import(
})
}
+/// Desugar a `with` expression.
+fn desugar_with(x: Expr, path: &[Label], y: Expr, span: Span) -> Expr {
+ use crate::operations::BinOp::RightBiasedRecordMerge;
+ use ExprKind::{Op, RecordLit};
+ use OpKind::{BinOp, Field};
+ let expr = |k| Expr::new(k, span.clone());
+ match path {
+ [] => y,
+ [l, rest @ ..] => {
+ let res = desugar_with(
+ expr(Op(Field(x.clone(), l.clone()))),
+ rest,
+ y,
+ span.clone(),
+ );
+ expr(Op(BinOp(
+ RightBiasedRecordMerge,
+ x,
+ expr(RecordLit(once((l.clone(), res)).collect())),
+ )))
+ }
+ }
+}
+
/// Desugar the first level of the expression.
fn desugar(expr: &Expr) -> Cow<'_, Expr> {
match expr.kind() {
@@ -301,6 +326,9 @@ fn desugar(expr: &Expr) -> Cow<'_, Expr> {
expr.span(),
))
}
+ ExprKind::Op(OpKind::With(x, path, y)) => {
+ Cow::Owned(desugar_with(x.clone(), path, y.clone(), expr.span()))
+ }
_ => Cow::Borrowed(expr),
}
}
diff --git a/dhall/src/syntax/ast/span.rs b/dhall/src/syntax/ast/span.rs
index ab3279b..b0c7b5a 100644
--- a/dhall/src/syntax/ast/span.rs
+++ b/dhall/src/syntax/ast/span.rs
@@ -21,7 +21,6 @@ pub enum Span {
/// Desugarings
DuplicateRecordFieldsSugar,
DottedFieldSugar,
- WithSugar,
RecordPunSugar,
/// For expressions obtained from decoding binary
Decoded,
diff --git a/dhall/src/syntax/binary/decode.rs b/dhall/src/syntax/binary/decode.rs
index 195bd0a..d360949 100644
--- a/dhall/src/syntax/binary/decode.rs
+++ b/dhall/src/syntax/binary/decode.rs
@@ -434,6 +434,27 @@ fn cbor_value_to_dhall(data: &cbor::Value) -> Result<DecodedExpr, DecodeError> {
let x = cbor_value_to_dhall(&x)?;
EmptyListLit(x)
}
+ [U64(29), x, labels, y] => {
+ let x = cbor_value_to_dhall(&x)?;
+ let y = cbor_value_to_dhall(&y)?;
+ let labels = match labels {
+ Array(labels) => labels
+ .iter()
+ .map(|s| match s {
+ String(s) => Ok(Label::from(s.as_str())),
+ _ => Err(DecodeError::WrongFormatError(
+ "with".to_owned(),
+ )),
+ })
+ .collect::<Result<_, _>>()?,
+ _ => {
+ return Err(DecodeError::WrongFormatError(
+ "with".to_owned(),
+ ))
+ }
+ };
+ Op(With(x, labels, y))
+ }
_ => {
return Err(DecodeError::WrongFormatError(format!(
"{:?}",
diff --git a/dhall/src/syntax/binary/encode.rs b/dhall/src/syntax/binary/encode.rs
index b6bbabe..33c7fa5 100644
--- a/dhall/src/syntax/binary/encode.rs
+++ b/dhall/src/syntax/binary/encode.rs
@@ -171,6 +171,10 @@ where
Op(Completion(x, y)) => {
ser_seq!(ser; tag(3), tag(13), expr(x), expr(y))
}
+ Op(With(x, ls, y)) => {
+ let ls: Vec<_> = ls.iter().map(label).collect();
+ ser_seq!(ser; tag(29), expr(x), ls, expr(y))
+ }
Import(import) => serialize_import(ser, import),
}
}
diff --git a/dhall/src/syntax/text/parser.rs b/dhall/src/syntax/text/parser.rs
index 06c1ac3..377f5e4 100644
--- a/dhall/src/syntax/text/parser.rs
+++ b/dhall/src/syntax/text/parser.rs
@@ -105,26 +105,6 @@ fn insert_recordlit_entry(map: &mut BTreeMap<Label, Expr>, l: Label, e: Expr) {
}
}
-fn desugar_with_expr(x: Expr, labels: &[Label], y: Expr) -> Expr {
- use crate::operations::BinOp::RightBiasedRecordMerge;
- let expr = |k| Expr::new(k, Span::WithSugar);
- match labels {
- [] => y,
- [l, rest @ ..] => {
- let res = desugar_with_expr(
- expr(Op(Field(x.clone(), l.clone()))),
- rest,
- y,
- );
- expr(Op(BinOp(
- RightBiasedRecordMerge,
- x,
- expr(RecordLit(once((l.clone(), res)).collect())),
- )))
- }
- }
-}
-
lazy_static::lazy_static! {
static ref PRECCLIMBER: PrecClimber<Rule> = {
use Rule::*;
@@ -778,7 +758,11 @@ impl DhallParser {
clauses.fold(
first,
|acc, (labels, e)| {
- desugar_with_expr(acc, &labels, e)
+ spanned_union(
+ acc.span(),
+ e.span(),
+ Op(With(acc, labels, e))
+ )
}
)
},
diff --git a/dhall/src/syntax/text/printer.rs b/dhall/src/syntax/text/printer.rs
index 8815d69..0c2eb2e 100644
--- a/dhall/src/syntax/text/printer.rs
+++ b/dhall/src/syntax/text/printer.rs
@@ -275,6 +275,10 @@ impl<SE: Display + Clone> Display for OpKind<SE> {
Completion(a, b) => {
write!(f, "{}::{}", a, b)?;
}
+ With(a, ls, b) => {
+ let ls = ls.iter().join(".");
+ write!(f, "{} with {} = {}", a, ls, b)?;
+ }
}
Ok(())
}
diff --git a/dhall/tests/parser/success/unit/WithB.txt b/dhall/tests/parser/success/unit/WithB.txt
index 74f42a2..555eb50 100644
--- a/dhall/tests/parser/success/unit/WithB.txt
+++ b/dhall/tests/parser/success/unit/WithB.txt
@@ -1 +1 @@
-{ a = 1 } ⫽ { a = 2 }
+{ a = 1 } with a = 2
diff --git a/dhall/tests/parser/success/unit/WithMultipleB.txt b/dhall/tests/parser/success/unit/WithMultipleB.txt
index 76782a5..dbc5bb3 100644
--- a/dhall/tests/parser/success/unit/WithMultipleB.txt
+++ b/dhall/tests/parser/success/unit/WithMultipleB.txt
@@ -1 +1 @@
-{ a = { b = 1 }, c = { d = 2 } } ⫽ { a = { a = { b = 1 }, c = { d = 2 } }.a ⫽ { b = 3 } } ⫽ { c = ({ a = { b = 1 }, c = { d = 2 } } ⫽ { a = { a = { b = 1 }, c = { d = 2 } }.a ⫽ { b = 3 } }).c ⫽ { e = 4 } }
+{ a = { b = 1 }, c = { d = 2 } } with a.b = 3 with c.e = 4
diff --git a/dhall/tests/parser/success/unit/WithPrecedence1B.txt b/dhall/tests/parser/success/unit/WithPrecedence1B.txt
index 5f22335..2509dba 100644
--- a/dhall/tests/parser/success/unit/WithPrecedence1B.txt
+++ b/dhall/tests/parser/success/unit/WithPrecedence1B.txt
@@ -1 +1 @@
-{ a = Some 1 } ⫽ { a = Some 2 } ⫽ { a = Some 3 }
+{ a = Some 1 } with a = Some 2 with a = Some 3
diff --git a/dhall/tests/parser/success/unit/WithPrecedence2B.txt b/dhall/tests/parser/success/unit/WithPrecedence2B.txt
index f945cc9..02df511 100644
--- a/dhall/tests/parser/success/unit/WithPrecedence2B.txt
+++ b/dhall/tests/parser/success/unit/WithPrecedence2B.txt
@@ -1 +1 @@
-{ x = 0 } ⫽ { x = 1 + 1 }
+{ x = 0 } with x = 1 + 1
diff --git a/dhall/tests/parser/success/unit/WithPrecedence3B.txt b/dhall/tests/parser/success/unit/WithPrecedence3B.txt
index a801b24..544b4d1 100644
--- a/dhall/tests/parser/success/unit/WithPrecedence3B.txt
+++ b/dhall/tests/parser/success/unit/WithPrecedence3B.txt
@@ -1 +1 @@
-foo::{ x = 0 } ⫽ { x = 1 }
+foo::{ x = 0 } with x = 1
diff --git a/dhall/tests/type-inference/failure/unit/WithInvalidOverrideA.txt b/dhall/tests/type-inference/failure/unit/WithInvalidOverrideA.txt
index de101e0..c34175f 100644
--- a/dhall/tests/type-inference/failure/unit/WithInvalidOverrideA.txt
+++ b/dhall/tests/type-inference/failure/unit/WithInvalidOverrideA.txt
@@ -1 +1,7 @@
Type error: error: MustCombineRecord
+ --> <current file>:1:1
+ |
+...
+6 | { a = 1 } with a.b = 2
+ | ^^^^^^^^^^^^^^^^^^^^^^ MustCombineRecord
+ |
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-27 19:40:08 +0000