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feat: Coleman-Liau Index.

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Shibo Lyu 2022-05-20 18:09:12 +08:00
parent 3a5ec5de50
commit 474c4c708d
3 changed files with 51 additions and 5 deletions
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Sources/Readability/Scorers/ColemanLiauIndex.swift Normal file
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//
// File.swift
//
//
// Created by Shibo Lyu on 2022/5/20.
//
import Foundation
public struct RAColemanLiauIndexScorer: RAScorer {
public static let requiresCommonMetrics: Set<RACommonMetric>? = [
.wordCount,
.characterCount,
.sentenceCount
]
public static let meta = RAScorerMeta(
name: "Coleman–Liau Index",
creator: "Meri Coleman & T. L. Liau",
citation: "Coleman, M., & Liau, T. L. (1975). A computer readability formula designed for machine scoring. Journal of Applied Psychology, 60(2), 283."
)
public init() {}
public func score(_ text: String, metrics: RACommonMetricsCalculator.Results?) -> Double {
let wordCount = metrics![.wordCount]!
let l = metrics![.characterCount]! * 100 / wordCount
let s = metrics![.sentenceCount]! * 100 / wordCount
let cloze = 141.8401 - (0.214590 * l) + (1.079812 * s)
return (-27.4004 * cloze) + 23.06395
}
}