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package summarize
import (
"math"
"github.com/jdkato/prose/internal/util"
)
// FleschKincaid computes the Flesch–Kincaid grade level
// (https://en.wikipedia.org/wiki/Flesch%E2%80%93Kincaid_readability_tests).
func (d *Document) FleschKincaid() float64 {
x := 0.39 * d.NumWords / d.NumSentences
y := 11.8 * d.NumSyllables / d.NumWords
return x + y - 15.59
}
// FleschReadingEase computes the Flesch reading-ease score
// (https://en.wikipedia.org/wiki/Flesch%E2%80%93Kincaid_readability_tests).
func (d *Document) FleschReadingEase() float64 {
x := 1.015 * d.NumWords / d.NumSentences
y := 84.6 * d.NumSyllables / d.NumWords
return 206.835 - x - y
}
// GunningFog computes the Gunning Fog index score
// (https://en.wikipedia.org/wiki/Gunning_fog_index).
func (d *Document) GunningFog() float64 {
x := d.NumWords / d.NumSentences
y := d.NumComplexWords / d.NumWords
return 0.4 * (x + 100.0*y)
}
// SMOG computes the SMOG grade (https://en.wikipedia.org/wiki/SMOG).
func (d *Document) SMOG() float64 {
return 1.0430*math.Sqrt(d.NumPolysylWords*30.0/d.NumSentences) + 3.1291
}
// AutomatedReadability computes the automated readability index score
// (https://en.wikipedia.org/wiki/Automated_readability_index).
func (d *Document) AutomatedReadability() float64 {
x := 4.71 * (d.NumCharacters / d.NumWords)
y := 0.5 * (d.NumWords / d.NumSentences)
return x + y - 21.43
}
// ColemanLiau computes the Coleman–Liau index score
// (https://en.wikipedia.org/wiki/Coleman%E2%80%93Liau_index).
func (d *Document) ColemanLiau() float64 {
x := 0.0588 * (d.NumCharacters / d.NumWords) * 100
y := 0.296 * (d.NumSentences / d.NumWords) * 100
return x - y - 15.8
}
// DaleChall computes the Dale–Chall score
// (https://en.wikipedia.org/wiki/Dale%E2%80%93Chall_readability_formula).
func (d *Document) DaleChall() float64 {
easy := 0.0
for word := range d.WordFrequency {
// TODO: look into more efficient lookup techniques.
if util.StringInSlice(word, easyWords) {
easy++
}
}
hard := d.NumWords - easy
x := (hard / d.NumWords) * 100
y := (d.NumWords / d.NumSentences)
return 0.1579*x + 0.0496*y
}
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