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34 lines
921 B
Swift
34 lines
921 B
Swift
//
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// File.swift
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//
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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 RAColemanLiauIndexScorer: RAScorer {
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public static let requiresCommonMetrics: Set<RACommonMetric>? = [
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.wordCount,
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.characterCount,
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.sentenceCount
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]
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public static let meta = RAScorerMeta(
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name: "Coleman–Liau Index",
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creator: "Meri Coleman & T. L. Liau",
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citation: "Coleman, M., & Liau, T. L. (1975). A computer readability formula designed for machine scoring. Journal of Applied Psychology, 60(2), 283."
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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 wordCount = metrics![.wordCount]!
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let l = metrics![.characterCount]! * 100 / wordCount
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let s = metrics![.sentenceCount]! * 100 / wordCount
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let cloze = 141.8401 - (0.214590 * l) + (1.079812 * s)
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return (-27.4004 * cloze) + 23.06395
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}
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}
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