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add panic.nix and assertions to type checks

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This commit is contained in:
Emile Clark-Boman 2025-12-14 22:41:17 +10:00
parent fd008cd2e1
commit ea01dcc827
5 changed files with 44 additions and 25 deletions
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26
nib/types/maybe.nix
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@ -62,28 +62,34 @@ in rec {
_some_ = some; # allows _value_ to be null (yuck!!)
_value_ = value;
};
Some = value: Res true value;
Some = Res true;
None = Maybe false null;
# Pattern Matching
# Pattern Matching (unsafe and safe variants)
isMaybe = T: builtins.attrNames T == ["_some_" "_value_"];
isSome = T: isMaybe T && T._some_;
isNone = T: isMaybe T && !T._some_;
isSome' = T: isMaybe T && T._some_;
isSome = T:
assert isMaybe T || nib.panic.badType "Maybe" T;
isSome' T;
isNone' = T: isMaybe T && !T._some_;
isNone = T:
assert isMaybe T || nib.panic.badType "Maybe" T;
isNone' T;
# TODO: ensure you check isNone if isSome fails (otherwise it could be another type!)
# Unwrap (Monadic Return Operation)
unwrapMaybe = f: g: T:
if isSome T
then f T._value_
else g T._value_;
unwrapSome = unwrapMaybe (v: v);
unwrapNone = f: unwrapMaybe f (v: v);
# Map (Monadic Bind Operation)
mapMaybe = f: T:
if isSome T
then Some (f T._value_)
else None;
mapMaybe = f: unwrapMaybe (v: Some (f v)) (_: None);
# NOTE: yes this does nothing, its only here so I don't forget
# NOTE: (ie when pregenerating monadic operations with a custom ADT module)
mapSome = f: mapMaybe f;
mapSome = mapMaybe;
# Conditionals
someOr = f: T:
@ -96,7 +102,7 @@ in rec {
then T
else f T;
firstSome = findFirst isSome None;
firstSome = findFirst isSome' None;
nullableToMaybe = x:
if x == null