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Move nullable mapN to Nullable, and deprecate top-level ones #278

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Dec 21, 2020
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Move nullable mapN to Nullable, and deprecate top-level ones #278

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94 changes: 67 additions & 27 deletions arrow-core-data/src/main/kotlin/arrow/core/Nullable.kt
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Original file line number Diff line number Diff line change
@@ -1,47 +1,87 @@
@file:Suppress("NAME_SHADOWING")

package arrow.core

object Nullable {

inline fun <A, R> mapN(a: A?, fn: (A) -> R): R? =
mapN(a, Unit) { a, _ -> fn(a) }

inline fun <A, B, R> mapN(a: A?, b: B?, fn: (A, B) -> R): R? =
mapN(a, b, Unit) { a, b, _ -> fn(a, b) }

inline fun <A, B, C, R> mapN(a: A?, b: B?, c: C?, fn: (A, B, C) -> R): R? =
mapN(a, b, c, Unit) { a, b, c, _ -> fn(a, b, c) }

inline fun <A, B, C, D, R> mapN(a: A?, b: B?, c: C?, d: D?, fn: (A, B, C, D) -> R): R? =
mapN(a, b, c, d, Unit) { a, b, c, d, _ -> fn(a, b, c, d) }

inline fun <A, B, C, D, E, R> mapN(a: A?, b: B?, c: C?, d: D?, e: E?, fn: (A, B, C, D, E) -> R): R? =
mapN(a, b, c, d, e, Unit) { a, b, c, d, e, _ -> fn(a, b, c, d, e) }

inline fun <A, B, C, D, E, F, R> mapN(a: A?, b: B?, c: C?, d: D?, e: E?, f: F?, fn: (A, B, C, D, E, F) -> R): R? =
mapN(a, b, c, d, e, f, Unit) { a, b, c, d, e, f, _ -> fn(a, b, c, d, e, f) }

inline fun <A, B, C, D, E, F, G, R> mapN(a: A?, b: B?, c: C?, d: D?, e: E?, f: F?, g: G?, fn: (A, B, C, D, E, F, G) -> R): R? =
mapN(a, b, c, d, e, f, g, Unit) { a, b, c, d, e, f, g, _ -> fn(a, b, c, d, e, f, g) }

inline fun <A, B, C, D, E, F, G, H, R> mapN(a: A?, b: B?, c: C?, d: D?, e: E?, f: F?, g: G?, h: H?, fn: (A, B, C, D, E, F, G, H) -> R): R? =
mapN(a, b, c, d, e, f, g, h, Unit) { a, b, c, d, e, f, g, h, _ -> fn(a, b, c, d, e, f, g, h) }

inline fun <A, B, C, D, E, F, G, H, I, R> mapN(a: A?, b: B?, c: C?, d: D?, e: E?, f: F?, g: G?, h: H?, i: I?, fn: (A, B, C, D, E, F, G, H, I) -> R): R? =
a?.let { a ->
b?.let { b ->
c?.let { c ->
d?.let { d ->
e?.let { e ->
f?.let { f ->
g?.let { g ->
h?.let { h ->
i?.let { i ->
fn(a, b, c, d, e, f, g, h, i)
}
}
}
}
}
}
}
}
}
}

@Deprecated("Top-level mapN function for A? conflicts with other types such as List<A> and Map<K, V>", ReplaceWith("Nullable.mapN(a, fn", "arrow.core.mapN"))
inline fun <A, R> mapN(a: A?, fn: (A) -> R): R? =
mapN(a, Unit) { a, _ -> fn(a) }
Nullable.mapN(a, fn)

@Deprecated("Top-level mapN function for A? conflicts with other types such as List<A> and Map<K, V>", ReplaceWith("Nullable.mapN(a, b, fn", "arrow.core.mapN"))
inline fun <A, B, R> mapN(a: A?, b: B?, fn: (A, B) -> R): R? =
mapN(a, b, Unit) { a, b, _ -> fn(a, b) }
Nullable.mapN(a, b, fn)

@Deprecated("Top-level mapN function for A? conflicts with other types such as List<A> and Map<K, V>", ReplaceWith("Nullable.mapN(a, b, c, fn", "arrow.core.mapN"))
inline fun <A, B, C, R> mapN(a: A?, b: B?, c: C?, fn: (A, B, C) -> R): R? =
mapN(a, b, c, Unit) { a, b, c, _ -> fn(a, b, c) }
Nullable.mapN(a, b, c, fn)

@Deprecated("Top-level mapN function for A? conflicts with other types such as List<A> and Map<K, V>", ReplaceWith("Nullable.mapN(a, b, c, d, fn", "arrow.core.mapN"))
inline fun <A, B, C, D, R> mapN(a: A?, b: B?, c: C?, d: D?, fn: (A, B, C, D) -> R): R? =
mapN(a, b, c, d, Unit) { a, b, c, d, _ -> fn(a, b, c, d) }
Nullable.mapN(a, b, c, d, fn)

@Deprecated("Top-level mapN function for A? conflicts with other types such as List<A> and Map<K, V>", ReplaceWith("Nullable.mapN(a, b, c, d, e, fn", "arrow.core.mapN"))
inline fun <A, B, C, D, E, R> mapN(a: A?, b: B?, c: C?, d: D?, e: E?, fn: (A, B, C, D, E) -> R): R? =
mapN(a, b, c, d, e, Unit) { a, b, c, d, e, _ -> fn(a, b, c, d, e) }
Nullable.mapN(a, b, c, d, e, fn)

@Deprecated("Top-level mapN function for A? conflicts with other types such as List<A> and Map<K, V>", ReplaceWith("Nullable.mapN(a, b, c, d, e, f, fn", "arrow.core.mapN"))
inline fun <A, B, C, D, E, F, R> mapN(a: A?, b: B?, c: C?, d: D?, e: E?, f: F?, fn: (A, B, C, D, E, F) -> R): R? =
mapN(a, b, c, d, e, f, Unit) { a, b, c, d, e, f, _ -> fn(a, b, c, d, e, f) }
Nullable.mapN(a, b, c, d, e, f, fn)

@Deprecated("Top-level mapN function for A? conflicts with other types such as List<A> and Map<K, V>", ReplaceWith("Nullable.mapN(a, b, c, d, e, f, g, fn", "arrow.core.mapN"))
inline fun <A, B, C, D, E, F, G, R> mapN(a: A?, b: B?, c: C?, d: D?, e: E?, f: F?, g: G?, fn: (A, B, C, D, E, F, G) -> R): R? =
mapN(a, b, c, d, e, f, g, Unit) { a, b, c, d, e, f, g, _ -> fn(a, b, c, d, e, f, g) }
Nullable.mapN(a, b, c, d, e, f, g, fn)

@Deprecated("Top-level mapN function for A? conflicts with other types such as List<A> and Map<K, V>", ReplaceWith("Nullable.mapN(a, b, c, d, e, f, g, h, fn", "arrow.core.mapN"))
inline fun <A, B, C, D, E, F, G, H, R> mapN(a: A?, b: B?, c: C?, d: D?, e: E?, f: F?, g: G?, h: H?, fn: (A, B, C, D, E, F, G, H) -> R): R? =
mapN(a, b, c, d, e, f, g, h, Unit) { a, b, c, d, e, f, g, h, _ -> fn(a, b, c, d, e, f, g, h) }
Nullable.mapN(a, b, c, d, e, f, g, h, fn)

@Deprecated("Top-level mapN function for A? conflicts with other types such as List<A> and Map<K, V>", ReplaceWith("Nullable.mapN(a, b, c, d, e, f, g, h, i, fn", "arrow.core.mapN"))
inline fun <A, B, C, D, E, F, G, H, I, R> mapN(a: A?, b: B?, c: C?, d: D?, e: E?, f: F?, g: G?, h: H?, i: I?, fn: (A, B, C, D, E, F, G, H, I) -> R): R? =
a?.let { a ->
b?.let { b ->
c?.let { c ->
d?.let { d ->
e?.let { e ->
f?.let { f ->
g?.let { g ->
h?.let { h ->
i?.let { i ->
fn(a, b, c, d, e, f, g, h, i)
}
}
}
}
}
}
}
}
}
Nullable.mapN(a, b, c, d, e, f, g, h, i, fn)