Change constructing method from `Constructor`’s instance methods to constructing type’s static methods
This commit is contained in:
Norio Nomura
parent
6ddf3e910c
commit
4ec403cf62
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@ -9,88 +9,61 @@
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import Foundation
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public final class Constructor {
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public typealias Method = (Constructor) -> (Node) -> Any?
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let tagMethodMap: [Tag.Name:Method]
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public typealias Map = [Tag.Name: (Node) -> Any?]
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public init(_ map: [Tag.Name:Method]) {
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tagMethodMap = map
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public init(_ map: Map) {
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methodMap = map
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}
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public func any(from node: Node) -> Any {
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if let tagName = node.tag.name, let method = tagMethodMap[tagName], let result = method(self)(node) {
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if let tagName = node.tag.name, let method = methodMap[tagName], let result = method(node) {
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return result
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}
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switch node {
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case .scalar:
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return str(from: node)
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return String._construct(from: node)
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case .mapping:
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return map(from: node)
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return [AnyHashable: Any]._construct(from: node)
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case .sequence:
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return seq(from: node)
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return [Any].construct(from: node)
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}
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}
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func flatten_mapping(_ node: Node) -> Node {
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guard var pairs = node.pairs else { fatalError("Never happen this") }
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var merge = [Pair<Node>]()
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var index = pairs.startIndex
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while index < pairs.count {
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let pair = pairs[index]
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if pair.key.tag.name == .merge {
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pairs.remove(at: index)
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switch pair.value {
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case .mapping:
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let flattened_node = flatten_mapping(pair.value)
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if let pairs = flattened_node.pairs {
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merge.append(contentsOf: pairs)
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}
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case let .sequence(array, _):
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let submerge = array
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.filter { $0.isMapping } // TODO: Should raise error on other than mapping
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.flatMap { flatten_mapping($0).pairs }
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.reversed()
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submerge.forEach {
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merge.append(contentsOf: $0)
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}
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default:
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break // TODO: Should raise error on other than mapping or sequence
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}
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} else if pair.key.tag.name == .value {
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pair.key.tag.name = .str
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index += 1
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} else {
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index += 1
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}
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}
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return .mapping(merge + pairs, node.tag)
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}
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private let methodMap: Map
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}
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public func map(from node: Node) -> [AnyHashable:Any] {
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guard let pairs = flatten_mapping(node).pairs else { fatalError("Never happen this") }
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var dictionary = [AnyHashable: Any](minimumCapacity: pairs.count)
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pairs.forEach {
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// TODO: YAML supports keys other than str.
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dictionary[str(from: $0.key)] = any(from: $0.value)
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}
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return dictionary
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}
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extension Constructor {
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public static let `default` = Constructor(defaultMap)
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public func str(from node: Node) -> String {
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if case let .mapping(pairs, _) = node {
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for pair in pairs where pair.key.tag.name == .value {
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return str(from: pair.value)
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}
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}
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guard let scalar = node.scalar else { fatalError("Never happen this") }
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return scalar
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}
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// We can not write extension of map because that is alias of specialized dictionary
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public static let defaultMap: Map = [
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// Failsafe Schema
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.map: [AnyHashable: Any].construct,
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.str: String.construct,
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.seq: [Any].construct,
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// JSON Schema
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.bool: Bool.construct,
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.float: Double.construct,
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.null: NSNull.construct,
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.int: Int.construct,
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// http://yaml.org/type/index.html
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.binary: Data.construct,
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// .merge is supported in `[AnyHashable: Any].construct`.
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.omap: [Any].construct_omap,
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.pairs: [Any].construct_pairs,
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.set: Set<AnyHashable>.construct,
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.timestamp: Date.construct
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// .value is supported in `String.construct` and `[AnyHashable: Any].construct`.
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]
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}
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public func seq(from node: Node) -> [Any] {
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guard let array = node.sequence else { fatalError("Never happen this") }
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return array.map { any(from: $0) }
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}
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// MARK: - ScalarConstructible
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public protocol ScalarConstructible {
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static func construct(from node: Node) -> Self?
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}
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public func bool(from node: Node) -> Bool? {
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extension Bool: ScalarConstructible {
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public static func construct(from node: Node) -> Bool? {
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guard let scalar = node.scalar else { fatalError("Never happen this") }
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switch scalar.lowercased() {
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case "true", "yes", "on":
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@ -101,130 +74,24 @@ public final class Constructor {
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return nil
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}
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}
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}
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public func float(from node: Node) -> Double? {
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guard var scalar = node.scalar else { fatalError("Never happen this") }
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switch scalar {
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case ".inf", ".Inf", ".INF", "+.inf", "+.Inf", "+.INF":
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return Double.infinity
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case "-.inf", "-.Inf", "-.INF":
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return -Double.infinity
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case ".nan", ".NaN", ".NAN":
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return Double.nan
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default:
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scalar = scalar.replacingOccurrences(of: "_", with: "")
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if scalar.contains(":") {
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var sign: Double = 1
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if scalar.hasPrefix("-") {
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sign = -1
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scalar = scalar.substring(from: scalar.index(after: scalar.startIndex))
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} else if scalar.hasPrefix("+") {
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scalar = scalar.substring(from: scalar.index(after: scalar.startIndex))
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}
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let digits = scalar.components(separatedBy: ":").flatMap(Double.init).reversed()
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var base = 1.0
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var value = 0.0
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digits.forEach {
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value += $0 * base
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base *= 60
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}
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return sign * value
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}
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return Double(scalar)
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}
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}
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public func null(from node: Node) -> NSNull? {
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guard let scalar = node.scalar else { fatalError("Never happen this") }
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switch scalar {
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case "", "~", "null", "Null", "NULL":
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return NSNull()
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default:
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return nil
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}
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}
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public func int(from node: Node) -> Int? {
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guard var scalar = node.scalar else { fatalError("Never happen this") }
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scalar = scalar.replacingOccurrences(of: "_", with: "")
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if scalar == "0" {
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return 0
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}
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if scalar.hasPrefix("0x") {
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let hexadecimal = scalar.substring(from: scalar.index(scalar.startIndex, offsetBy: 2))
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return Int(hexadecimal, radix: 16)
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}
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if scalar.hasPrefix("0b") {
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let octal = scalar.substring(from: scalar.index(scalar.startIndex, offsetBy: 2))
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return Int(octal, radix: 2)
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}
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if scalar.hasPrefix("0o") {
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let octal = scalar.substring(from: scalar.index(scalar.startIndex, offsetBy: 2))
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return Int(octal, radix: 8)
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}
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if scalar.hasPrefix("0") {
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let octal = scalar.substring(from: scalar.index(after: scalar.startIndex))
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return Int(octal, radix: 8)
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}
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if scalar.contains(":") {
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var sign = 1
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if scalar.hasPrefix("-") {
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sign = -1
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scalar = scalar.substring(from: scalar.index(after: scalar.startIndex))
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} else if scalar.hasPrefix("+") {
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scalar = scalar.substring(from: scalar.index(after: scalar.startIndex))
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}
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let digits = scalar.components(separatedBy: ":").flatMap({ Int($0) }).reversed()
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var base = 1
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var value = 0
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digits.forEach {
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value += $0 * base
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base *= 60
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}
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return sign * value
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}
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return Int(scalar)
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}
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public func binary(from node: Node) -> Data? {
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extension Data: ScalarConstructible {
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public static func construct(from node: Node) -> Data? {
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guard let scalar = node.scalar else { fatalError("Never happen this") }
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let data = Data(base64Encoded: scalar, options: .ignoreUnknownCharacters)
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return data
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}
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}
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public func omap(from node: Node) -> [(Any, Any)] {
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// Note: we do not check for duplicate keys.
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guard let array = node.sequence else { fatalError("Never happen this") }
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return array.flatMap { subnode -> (Any, Any)? in
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// TODO: Should rais error if subnode is not mapping or pairs.count != 1
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guard let pairs = subnode.pairs, let pair = pairs.first else { return nil }
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return (any(from: pair.key), any(from: pair.value))
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}
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}
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public func pairs(from node: Node) -> [(Any, Any)] {
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// Note: the same code as `omap(from:)`.
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guard let array = node.sequence else { fatalError("Never happen this") }
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return array.flatMap { subnode -> (Any, Any)? in
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// TODO: Should rais error if subnode is not mapping or pairs.count != 1
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guard let pairs = subnode.pairs, let pair = pairs.first else { return nil }
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return (any(from: pair.key), any(from: pair.value))
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}
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}
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public func set(from node: Node) -> Set<AnyHashable> {
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guard let pairs = node.pairs else { fatalError("Never happen this") }
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// TODO: YAML supports Hashable elements other than str.
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return Set(pairs.map({ str(from: $0.key) as AnyHashable }))
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}
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public func timestamp(from node: Node) -> Date? {
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extension Date: ScalarConstructible {
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public static func construct(from node: Node) -> Date? {
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guard let scalar = node.scalar else { fatalError("Never happen this") }
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let range = NSRange(location: 0, length: scalar.utf16.count)
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guard let result = timestampPattern.firstMatch(in: scalar, options: [], range: range),
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result.range.location != NSNotFound else {
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return nil
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result.range.location != NSNotFound else {
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return nil
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}
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#if os(Linux)
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let components = (1..<result.numberOfRanges).map(result.range(at:)).map(scalar.substring)
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@ -266,51 +133,216 @@ public final class Constructor {
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// Using `DateComponents.date` causes crash on Linux
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return NSCalendar(identifier: .gregorian)?.date(from: datecomponents)
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}
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private static let timestampPattern: NSRegularExpression = pattern([
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"^([0-9][0-9][0-9][0-9])", // year
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"-([0-9][0-9]?)", // month
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"-([0-9][0-9]?)", // day
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"(?:(?:[Tt]|[ \\t]+)",
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"([0-9][0-9]?)", // hour
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":([0-9][0-9])", // minute
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":([0-9][0-9])", // second
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"(?:\\.([0-9]*))?", // fraction
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"(?:[ \\t]*(Z|([-+])([0-9][0-9]?)", // tz_sign, tz_hour
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"(?::([0-9][0-9]))?))?)?$" // tz_minute
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].joined()
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)
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}
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fileprivate let timestampPattern: NSRegularExpression = pattern([
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"^([0-9][0-9][0-9][0-9])", // year
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"-([0-9][0-9]?)", // month
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"-([0-9][0-9]?)", // day
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"(?:(?:[Tt]|[ \\t]+)",
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"([0-9][0-9]?)", // hour
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":([0-9][0-9])", // minute
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":([0-9][0-9])", // second
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"(?:\\.([0-9]*))?", // fraction
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"(?:[ \\t]*(Z|([-+])([0-9][0-9]?)", // tz_sign, tz_hour
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"(?::([0-9][0-9]))?))?)?$" // tz_minute
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].joined()
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)
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extension Constructor {
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public static let `default` = Constructor([
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// Failsafe Schema
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.str: Constructor.str,
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.seq: Constructor.seq,
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.map: Constructor.map,
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// JSON Schema
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.bool: Constructor.bool,
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.float: Constructor.float,
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.null: Constructor.null,
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.int: Constructor.int,
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// http://yaml.org/type/index.html
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.binary: Constructor.binary,
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// .merge is supported in `Constructor.map`.
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.omap: Constructor.omap,
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.pairs: Constructor.pairs,
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.set: Constructor.set,
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.timestamp: Constructor.timestamp
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// .value is supported in `Constructor.str` and `Constructor.map`.
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])
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extension Double: ScalarConstructible {
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public static func construct(from node: Node) -> Double? {
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guard var scalar = node.scalar else { fatalError("Never happen this") }
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switch scalar {
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case ".inf", ".Inf", ".INF", "+.inf", "+.Inf", "+.INF":
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return Double.infinity
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case "-.inf", "-.Inf", "-.INF":
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return -Double.infinity
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case ".nan", ".NaN", ".NAN":
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return Double.nan
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default:
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scalar = scalar.replacingOccurrences(of: "_", with: "")
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if scalar.contains(":") {
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var sign: Double = 1
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if scalar.hasPrefix("-") {
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sign = -1
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scalar = scalar.substring(from: scalar.index(after: scalar.startIndex))
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} else if scalar.hasPrefix("+") {
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scalar = scalar.substring(from: scalar.index(after: scalar.startIndex))
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}
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let digits = scalar.components(separatedBy: ":").flatMap(Double.init).reversed()
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var base = 1.0
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var value = 0.0
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digits.forEach {
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value += $0 * base
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base *= 60
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}
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return sign * value
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}
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return Double(scalar)
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}
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}
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}
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fileprivate let ISO8601Formatter: DateFormatter = {
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let dateFormatter = DateFormatter()
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dateFormatter.locale = Locale(identifier: "en_US_POSIX")
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dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
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dateFormatter.dateFormat = "yyyy-MM-ddTHH:mm:ssZ"
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return dateFormatter
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}()
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extension Int: ScalarConstructible {
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public static func construct(from node: Node) -> Int? {
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guard var scalar = node.scalar else { fatalError("Never happen this") }
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scalar = scalar.replacingOccurrences(of: "_", with: "")
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if scalar == "0" {
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return 0
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}
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if scalar.hasPrefix("0x") {
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let hexadecimal = scalar.substring(from: scalar.index(scalar.startIndex, offsetBy: 2))
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return Int(hexadecimal, radix: 16)
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}
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if scalar.hasPrefix("0b") {
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let octal = scalar.substring(from: scalar.index(scalar.startIndex, offsetBy: 2))
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return Int(octal, radix: 2)
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}
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if scalar.hasPrefix("0o") {
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let octal = scalar.substring(from: scalar.index(scalar.startIndex, offsetBy: 2))
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return Int(octal, radix: 8)
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}
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if scalar.hasPrefix("0") {
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let octal = scalar.substring(from: scalar.index(after: scalar.startIndex))
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return Int(octal, radix: 8)
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}
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if scalar.contains(":") {
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var sign = 1
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if scalar.hasPrefix("-") {
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sign = -1
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scalar = scalar.substring(from: scalar.index(after: scalar.startIndex))
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} else if scalar.hasPrefix("+") {
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scalar = scalar.substring(from: scalar.index(after: scalar.startIndex))
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}
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let digits = scalar.components(separatedBy: ":").flatMap({ Int($0) }).reversed()
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var base = 1
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var value = 0
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digits.forEach {
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value += $0 * base
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base *= 60
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}
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return sign * value
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}
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return Int(scalar)
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}
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}
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extension String: ScalarConstructible {
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public static func construct(from node: Node) -> String? {
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return _construct(from: node)
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}
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fileprivate static func _construct(from node: Node) -> String {
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if case let .mapping(pairs, _) = node {
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for pair in pairs where pair.key.tag.name == .value {
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return _construct(from: pair.value)
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}
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}
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guard let scalar = node.scalar else { fatalError("Never happen this") }
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return scalar
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}
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}
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// MARK: - Types that can't conform to ScalarConstructible
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extension NSNull/*: ScalarConstructible*/ {
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public static func construct(from node: Node) -> NSNull? {
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guard let scalar = node.scalar else { fatalError("Never happen this") }
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switch scalar {
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case "", "~", "null", "Null", "NULL":
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return NSNull()
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default:
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return nil
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}
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}
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}
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// MARK: mapping
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extension Dictionary {
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public static func construct(from node: Node) -> [AnyHashable: Any]? {
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return _construct(from: node)
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}
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public static func _construct(from node: Node) -> [AnyHashable: Any] {
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guard let pairs = flatten_mapping(node).pairs else { fatalError("Never happen this") }
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var dictionary = [AnyHashable: Any](minimumCapacity: pairs.count)
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pairs.forEach {
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// TODO: YAML supports keys other than str.
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dictionary[String._construct(from: $0.key)] = node.tag.constructor.any(from: $0.value)
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}
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return dictionary
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}
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private static func flatten_mapping(_ node: Node) -> Node {
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guard var pairs = node.pairs else { fatalError("Never happen this") }
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var merge = [Pair<Node>]()
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var index = pairs.startIndex
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while index < pairs.count {
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let pair = pairs[index]
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if pair.key.tag.name == .merge {
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pairs.remove(at: index)
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switch pair.value {
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case .mapping:
|
||||
let flattened_node = flatten_mapping(pair.value)
|
||||
if let pairs = flattened_node.pairs {
|
||||
merge.append(contentsOf: pairs)
|
||||
}
|
||||
case let .sequence(array, _):
|
||||
let submerge = array
|
||||
.filter { $0.isMapping } // TODO: Should raise error on other than mapping
|
||||
.flatMap { flatten_mapping($0).pairs }
|
||||
.reversed()
|
||||
submerge.forEach {
|
||||
merge.append(contentsOf: $0)
|
||||
}
|
||||
default:
|
||||
break // TODO: Should raise error on other than mapping or sequence
|
||||
}
|
||||
} else if pair.key.tag.name == .value {
|
||||
pair.key.tag.name = .str
|
||||
index += 1
|
||||
} else {
|
||||
index += 1
|
||||
}
|
||||
}
|
||||
return .mapping(merge + pairs, node.tag)
|
||||
}
|
||||
}
|
||||
|
||||
extension Set {
|
||||
public static func construct(from node: Node) -> Set<AnyHashable>? {
|
||||
guard let pairs = node.pairs else { fatalError("Never happen this") }
|
||||
// TODO: YAML supports Hashable elements other than str.
|
||||
return Set<AnyHashable>(pairs.map({ String._construct(from: $0.key) as AnyHashable }))
|
||||
}
|
||||
}
|
||||
|
||||
// MARK: sequence
|
||||
extension Array {
|
||||
public static func construct(from node: Node) -> [Any] {
|
||||
guard let array = node.sequence else { fatalError("Never happen this") }
|
||||
return array.map { node.tag.constructor.any(from: $0) }
|
||||
}
|
||||
|
||||
public static func construct_omap(from node: Node) -> [(Any, Any)] {
|
||||
// Note: we do not check for duplicate keys.
|
||||
guard let array = node.sequence else { fatalError("Never happen this") }
|
||||
return array.flatMap { subnode -> (Any, Any)? in
|
||||
// TODO: Should rais error if subnode is not mapping or pairs.count != 1
|
||||
guard let pairs = subnode.pairs, let pair = pairs.first else { return nil }
|
||||
return (node.tag.constructor.any(from: pair.key), node.tag.constructor.any(from: pair.value))
|
||||
}
|
||||
}
|
||||
|
||||
public static func construct_pairs(from node: Node) -> [(Any, Any)] {
|
||||
// Note: we do not check for duplicate keys.
|
||||
guard let array = node.sequence else { fatalError("Never happen this") }
|
||||
return array.flatMap { subnode -> (Any, Any)? in
|
||||
// TODO: Should rais error if subnode is not mapping or pairs.count != 1
|
||||
guard let pairs = subnode.pairs, let pair = pairs.first else { return nil }
|
||||
return (node.tag.constructor.any(from: pair.key), node.tag.constructor.any(from: pair.value))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fileprivate extension String {
|
||||
func substring(with range: NSRange) -> String? {
|
||||
|
|
|
|||
|
|
@ -43,31 +43,31 @@ extension Node {
|
|||
}
|
||||
|
||||
public var string: String? {
|
||||
return tag.constructor.str(from: self)
|
||||
return String.construct(from: self)
|
||||
}
|
||||
|
||||
public var bool: Bool? {
|
||||
return tag.constructor.bool(from: self)
|
||||
return Bool.construct(from: self)
|
||||
}
|
||||
|
||||
public var float: Double? {
|
||||
return tag.constructor.float(from: self)
|
||||
return Double.construct(from: self)
|
||||
}
|
||||
|
||||
public var null: NSNull? {
|
||||
return tag.constructor.null(from: self)
|
||||
return NSNull.construct(from: self)
|
||||
}
|
||||
|
||||
public var int: Int? {
|
||||
return tag.constructor.int(from: self)
|
||||
return Int.construct(from: self)
|
||||
}
|
||||
|
||||
public var binary: Data? {
|
||||
return tag.constructor.binary(from: self)
|
||||
return Data.construct(from: self)
|
||||
}
|
||||
|
||||
public var timestamp: Date? {
|
||||
return tag.constructor.timestamp(from: self)
|
||||
return Date.construct(from: self)
|
||||
}
|
||||
|
||||
public subscript(node: Node) -> Node? {
|
||||
|
|
|
|||
Loading…
Reference in New Issue