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FunctionBuilder.swift
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FunctionBuilder.swift
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//
// FunctionBuilder.swift
//
//
// Created by tarunon on 2020/08/27.
//
/// Generic function builder
@_functionBuilder
public struct FunctionBuilder<C> {
public typealias Empty = BuildSet.Empty<C>
public typealias Pair = BuildSet.Pair
public typealias Either = BuildSet.Either
public static func buildBlock() -> Empty {
.init()
}
public static func buildBlock<C>(_ c: C) -> C {
c
}
public static func buildBlock<C0, C1>(_ c0: C0, _ c1: C1) -> Pair<C0, C1> {
.init(c0: c0, c1: c1)
}
public static func buildIf<C>(_ c: C?) -> Either<C, Empty> {
if let c = c {
return .c0(c)
} else {
return .c1(.init())
}
}
public static func buildEither<T, F>(first: T) -> Either<T, F> {
.c0(first)
}
public static func buildEither<T, F>(second: F) -> Either<T, F> {
.c1(second)
}
}
extension FunctionBuilder {
public static func buildBlock<C0, C1, C2>(_ c0: C0, _ c1: C1, _ c2: C2) -> Pair<
Pair<C0, C1>, C2
> {
.init(c0: .init(c0: c0, c1: c1), c1: c2)
}
public static func buildBlock<C0, C1, C2, C3>(_ c0: C0, _ c1: C1, _ c2: C2, _ c3: C3) -> Pair<
Pair<C0, C1>, Pair<C2, C3>
> {
.init(c0: .init(c0: c0, c1: c1), c1: .init(c0: c2, c1: c3))
}
public static func buildBlock<C0, C1, C2, C3, C4>(
_ c0: C0, _ c1: C1, _ c2: C2, _ c3: C3, _ c4: C4
) -> Pair<Pair<Pair<C0, C1>, Pair<C2, C3>>, C4> {
.init(c0: .init(c0: .init(c0: c0, c1: c1), c1: .init(c0: c2, c1: c3)), c1: c4)
}
public static func buildBlock<C0, C1, C2, C3, C4, C5>(
_ c0: C0, _ c1: C1, _ c2: C2, _ c3: C3, _ c4: C4, _ c5: C5
) -> Pair<Pair<Pair<C0, C1>, Pair<C2, C3>>, Pair<C4, C5>> {
.init(
c0: .init(c0: .init(c0: c0, c1: c1), c1: .init(c0: c2, c1: c3)),
c1: .init(c0: c4, c1: c5))
}
public static func buildBlock<C0, C1, C2, C3, C4, C5, C6>(
_ c0: C0, _ c1: C1, _ c2: C2, _ c3: C3, _ c4: C4, _ c5: C5, _ c6: C6
) -> Pair<Pair<Pair<C0, C1>, Pair<C2, C3>>, Pair<Pair<C4, C5>, C6>> {
.init(
c0: .init(c0: .init(c0: c0, c1: c1), c1: .init(c0: c2, c1: c3)),
c1: .init(c0: .init(c0: c4, c1: c5), c1: c6))
}
public static func buildBlock<C0, C1, C2, C3, C4, C5, C6, C7>(
_ c0: C0, _ c1: C1, _ c2: C2, _ c3: C3, _ c4: C4, _ c5: C5, _ c6: C6, _ c7: C7
) -> Pair<Pair<Pair<C0, C1>, Pair<C2, C3>>, Pair<Pair<C4, C5>, Pair<C6, C7>>> {
.init(
c0: .init(c0: .init(c0: c0, c1: c1), c1: .init(c0: c2, c1: c3)),
c1: .init(c0: .init(c0: c4, c1: c5), c1: .init(c0: c6, c1: c7)))
}
public static func buildBlock<C0, C1, C2, C3, C4, C5, C6, C7, C8>(
_ c0: C0, _ c1: C1, _ c2: C2, _ c3: C3, _ c4: C4, _ c5: C5, _ c6: C6, _ c7: C7, _ c8: C8
) -> Pair<Pair<Pair<Pair<C0, C1>, Pair<C2, C3>>, Pair<Pair<C4, C5>, Pair<C6, C7>>>, C8> {
.init(
c0: .init(
c0: .init(c0: .init(c0: c0, c1: c1), c1: .init(c0: c2, c1: c3)),
c1: .init(c0: .init(c0: c4, c1: c5), c1: .init(c0: c6, c1: c7))), c1: c8)
}
public static func buildBlock<C0, C1, C2, C3, C4, C5, C6, C7, C8, C9>(
_ c0: C0, _ c1: C1, _ c2: C2, _ c3: C3, _ c4: C4, _ c5: C5, _ c6: C6, _ c7: C7, _ c8: C8,
_ c9: C9
) -> Pair<
Pair<Pair<Pair<C0, C1>, Pair<C2, C3>>, Pair<Pair<C4, C5>, Pair<C6, C7>>>, Pair<C8, C9>
> {
.init(
c0: .init(
c0: .init(c0: .init(c0: c0, c1: c1), c1: .init(c0: c2, c1: c3)),
c1: .init(c0: .init(c0: c4, c1: c5), c1: .init(c0: c6, c1: c7))),
c1: .init(c0: c8, c1: c9))
}
}