80 lines
1.8 KiB
Swift
80 lines
1.8 KiB
Swift
/// A result builder for creating ``TextNode`` types, similar to how
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/// `ViewBuilder` works in `SwiftUI`.
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///
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@resultBuilder
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public enum TextBuilder {
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@inlinable
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public static func buildPartialBlock<N: TextNode>(first: N) -> N {
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first
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}
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@inlinable
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public static func buildPartialBlock<N0: TextNode, N1: TextNode>(accumulated: N0, next: N1) -> _NodeContainer {
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.init(nodes: [accumulated, next])
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}
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@inlinable
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public static func buildArray<N: TextNode>(_ components: [N]) -> _NodeContainer {
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.init(nodes: components)
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}
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@inlinable
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public static func buildBlock<N: TextNode>(_ components: N...) -> _NodeContainer {
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.init(nodes: components)
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}
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@inlinable
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public static func buildEither<N: TextNode, N1: TextNode>(first component: N) -> _EitherNode<N, N1> {
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.first(component)
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}
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@inlinable
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public static func buildEither<N: TextNode, N1: TextNode>(second component: N1) -> _EitherNode<N, N1> {
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.second(component)
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}
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@inlinable
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public static func buildOptional<N: TextNode>(_ component: N?) -> N? {
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component
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}
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}
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// swiftlint:disable type_name
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public enum _EitherNode<N: TextNode, N1: TextNode>: TextNode {
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case first(N)
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case second(N1)
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public var body: some TextNode {
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switch self {
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case let .first(node): return node.eraseToAnyTextNode()
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case let .second(node): return node.eraseToAnyTextNode()
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}
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}
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}
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public struct _NodeContainer: TextNode {
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@usableFromInline
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var nodes: [any TextNode]
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@usableFromInline
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init(nodes: [any TextNode]) {
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self.nodes = nodes.reduce(into: [any TextNode]()) { array, next in
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if let many = next as? _NodeContainer {
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array += many.nodes
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} else {
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array.append(next)
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}
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}
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}
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@inlinable
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public var body: some TextNode {
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nodes.reduce("") { $0 + $1.render() }
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}
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}
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// swiftlint:enable type_name
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