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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2019 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 the list of Swift project authors
//
//===----------------------------------------------------------------------===//
/// Represents an indentation unit that is applied to lines that are pretty-printed.
public enum Indent: Hashable, Codable {
/// An indentation unit equal to the given number of tab characters.
///
/// This value is independent of the actual tab width, which is set separately in the
/// `Configuration`.
case tabs(Int)
/// An indentation unit equal to the given number of spaces.
case spaces(Int)
private enum CodingKeys: CodingKey {
case tabs
case spaces
}
public init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
let spacesCount = try container.decodeIfPresent(Int.self, forKey: .spaces)
let tabsCount = try container.decodeIfPresent(Int.self, forKey: .tabs)
if spacesCount != nil && tabsCount != nil {
throw DecodingError.dataCorrupted(
DecodingError.Context(
codingPath: decoder.codingPath,
debugDescription: "Only one of \"tabs\" or \"spaces\" may be specified"))
}
if let spacesCount = spacesCount {
self = .spaces(spacesCount)
return
}
if let tabsCount = tabsCount {
self = .tabs(tabsCount)
return
}
throw DecodingError.dataCorrupted(
DecodingError.Context(
codingPath: decoder.codingPath,
debugDescription: "One of \"tabs\" or \"spaces\" must be specified"))
}
public func encode(to encoder: Encoder) throws {
var container = encoder.container(keyedBy: CodingKeys.self)
switch self {
case .tabs(let count):
try container.encode(count, forKey: .tabs)
case .spaces(let count):
try container.encode(count, forKey: .spaces)
}
}
/// Returns the number of units (tabs or spaces) that this indent represents.
///
/// Note that this does _not_ represent the physical number of spaces occupied by the indentation.
public var count: Int {
switch self {
case .spaces(let count):
return count
case .tabs(let count):
return count
}
}
}
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