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30 lines
945 B
Swift
30 lines
945 B
Swift
//
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// File.swift
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// Readability
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//
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// Created by Shibo Lyu on 2022/5/20.
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//
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import Foundation
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public struct RAFleschKincaidGradeScorer: RAScorer {
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public static let requiresCommonMetrics: Set<RACommonMetric>? = [
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.avgWordsPerSentence,
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.avgSyllablesPerWord
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]
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public static let meta = RAScorerMeta(
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name: "Flesch-Kincaid Grade",
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creator: "John P. Kincaid",
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citation: "Kincaid, J. P., Fishburne Jr, R. P., Rogers, R. L., & Chissom, B. S. (1975). Derivation of new readability formulas (automated readability index, fog count and flesch reading ease formula) for navy enlisted personnel. Naval Technical Training Command Millington TN Research Branch."
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)
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public init() {}
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public func score(_ text: String, metrics: RACommonMetricsCalculator.Results?) -> Double {
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let asl = metrics![.avgWordsPerSentence]!
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let asw = metrics![.avgSyllablesPerWord]!
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return (0.39 * asl) + (11.8 * asw) - 15.59
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}
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}
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