From 66972b05e5996132a83332ef0c6879c3a1679dc7 Mon Sep 17 00:00:00 2001 From: Nadrieril Date: Wed, 11 Mar 2020 17:26:09 +0000 Subject: Implement record puns --- dhall/src/syntax/ast/span.rs | 1 + dhall/src/syntax/text/dhall.pest.visibility | 2 ++ dhall/src/syntax/text/parser.rs | 5 +++++ dhall/src/syntax/text/printer.rs | 2 +- 4 files changed, 9 insertions(+), 1 deletion(-) (limited to 'dhall/src') diff --git a/dhall/src/syntax/ast/span.rs b/dhall/src/syntax/ast/span.rs index 50985e1..153a624 100644 --- a/dhall/src/syntax/ast/span.rs +++ b/dhall/src/syntax/ast/span.rs @@ -22,6 +22,7 @@ pub(crate) enum Span { DuplicateRecordFieldsSugar, DottedFieldSugar, WithSugar, + RecordPunSugar, /// For expressions obtained from decoding binary Decoded, /// For expressions constructed during normalization/typecheck diff --git a/dhall/src/syntax/text/dhall.pest.visibility b/dhall/src/syntax/text/dhall.pest.visibility index 0ff1bfe..2a89076 100644 --- a/dhall/src/syntax/text/dhall.pest.visibility +++ b/dhall/src/syntax/text/dhall.pest.visibility @@ -184,6 +184,8 @@ non_empty_record_type record_type_entry non_empty_record_literal record_literal_entry +# record_literal_punned_entry +# record_literal_normal_entry union_type empty_union_type # non_empty_union_type diff --git a/dhall/src/syntax/text/parser.rs b/dhall/src/syntax/text/parser.rs index f59cf06..b3c2c40 100644 --- a/dhall/src/syntax/text/parser.rs +++ b/dhall/src/syntax/text/parser.rs @@ -954,6 +954,11 @@ impl DhallParser { fn record_literal_entry(input: ParseInput) -> ParseResult<(Label, Expr)> { Ok(match_nodes!(input.into_children(); + [label(name)] => { + // Desugar record pun into a variable + let expr = Expr::new(Var(name.clone().into()), Span::RecordPunSugar); + (name, expr) + }, [label(name), expression(expr)] => (name, expr), [label(first_name), label(names).., expression(expr)] => { // Desugar dotted field syntax into nested records diff --git a/dhall/src/syntax/text/printer.rs b/dhall/src/syntax/text/printer.rs index 5bb987b..a8991b0 100644 --- a/dhall/src/syntax/text/printer.rs +++ b/dhall/src/syntax/text/printer.rs @@ -357,7 +357,7 @@ impl Display for Label { let s = String::from(self); let is_reserved = match s.as_str() { "let" | "in" | "if" | "then" | "else" | "Type" | "Kind" - | "Sort" | "True" | "False" => true, + | "Sort" | "True" | "False" | "Some" => true, _ => crate::syntax::Builtin::parse(&s).is_some(), }; if !is_reserved && s.chars().all(|c| c.is_ascii_alphanumeric()) { -- cgit v1.2.3