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Language.Nix: improve and test Identifier handling #669

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Merged
merged 11 commits into from
Sep 15, 2025
Merged

Language.Nix: improve and test Identifier handling #669

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644be5e
Language.Nix.Identifier: Identifiers can never contain NUL bytes
sternenseemann Sep 12, 2025
0c58f0c
Language.Nix.Identifier: move props for ident into test suite
sternenseemann Sep 12, 2025
bccd73e
Language.Nix.Identifier: move parseM properties into test suite
sternenseemann Sep 12, 2025
e124dab
language-nix/test: avoid NUL bytes
sternenseemann Sep 12, 2025
1b257dd
language-nix/test: report how many tested identifiers need quoting
sternenseemann Sep 12, 2025
eb6475f
Language.Nix.Identifier: generate more simple identifiers
sternenseemann Sep 12, 2025
d3bfb90
language-nix: exclude unused Paths_ module
sternenseemann Sep 12, 2025
1c0287d
Language.Nix.Identifier: there is no Text class
sternenseemann Sep 12, 2025
5ee5f4c
Language.Nix.Identifier: add parseM examples
sternenseemann Sep 12, 2025
6417872
Language.Nix.Identifier: quote Identifiers that are Nix keywords
sternenseemann Sep 12, 2025
17586e3
hackage2nix: use Identifier for bindings in hackage-packages.nix
sternenseemann Sep 12, 2025
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Language.Nix.Identifier: Identifiers can never contain NUL bytes 
The representation with Strings is tricky of course since identifiers in
Nix are technically byte strings (if you allow quoting). For our
purposes, it is practical to assume that all identifiers are ASCII or
UTF-8 encoded. With quoting, we can represent any Unicode character
except '\0'.
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@sternenseemann
sternenseemann committed Sep 12, 2025
commit 644be5e956c2123f44fa7c96c9731fa851127f09
5 changes: 4 additions & 1 deletion language-nix/src/Language/Nix/Identifier.hs
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Expand Up @@ -33,6 +33,9 @@ import Text.PrettyPrint.HughesPJClass as PP
-- >>> pPrint (ident # "foo.bar")
-- "foo.bar"
--
-- __Warning__: Identifiers /may not/ contain @\'\\0\'@, but this is not
-- checked during construction!
--
-- prop> \str -> Just (ident # str) == parseM "Ident" (quote str)
-- prop> \i -> Just (i :: Identifier) == parseM "Ident" (prettyShow i)
declareLenses [d| newtype Identifier = Identifier { ident :: String }
Expand All @@ -49,7 +52,7 @@ instance NFData Identifier where
rnf (Identifier str) = rnf str

instance Arbitrary Identifier where
arbitrary = Identifier <$> listOf1 arbitraryUnicodeChar
arbitrary = Identifier <$> listOf1 (arbitraryUnicodeChar `suchThat` (/= '\0'))
shrink (Identifier i) = map Identifier (shrink i)

instance CoArbitrary Identifier
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