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/*
This source file is part of the Swift.org open source project
Copyright (c) 2021 Apple Inc. and the Swift project authors
Licensed under Apache License v2.0 with Runtime Library Exception
See https://swift.org/LICENSE.txt for license information
See https://swift.org/CONTRIBUTORS.txt for Swift project authors
*/
/// A heading.
public struct Heading: BlockMarkup, InlineContainer {
public var _data: _MarkupData
init(_ raw: RawMarkup) throws {
guard case .heading = raw.data else {
throw RawMarkup.Error.concreteConversionError(from: raw, to: Heading.self)
}
let absoluteRaw = AbsoluteRawMarkup(markup: raw, metadata: MarkupMetadata(id: .newRoot(), indexInParent: 0))
self.init(_MarkupData(absoluteRaw))
}
init(_ data: _MarkupData) {
self._data = data
}
}
// MARK: - Public API
public extension Heading {
// MARK: Primitive
/// Create a heading with a level and a sequence of children.
init<Children: Sequence>(level: Int, _ children: Children) where Children.Element == InlineMarkup {
try! self.init(.heading(level: level, parsedRange: nil, children.map { $0.raw.markup }))
}
/// The level of the heading, starting at `1`.
var level: Int {
get {
guard case let .heading(level) = _data.raw.markup.data else {
fatalError("\(self) markup wrapped unexpected \(_data.raw)")
}
return level
}
set {
precondition(newValue > 0, "Heading level must be 1 or greater")
guard level != newValue else {
return
}
_data = _data.replacingSelf(.heading(level: newValue, parsedRange: nil, _data.raw.markup.copyChildren()))
}
}
// MARK: Secondary
/// Create a heading with a level and a sequence of children.
init(level: Int, _ children: InlineMarkup...) {
self.init(level: level, children)
}
// MARK: Visitation
func accept<V: MarkupVisitor>(_ visitor: inout V) -> V.Result {
return visitor.visitHeading(self)
}
}
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