Merge branch 'master' of ssh://github.com/jdkato/prose

summarize/readability.go

@@ -30,6 +30,12 @@ func (d *Document) GunningFog() float64 {
 	return 0.4 * (x + 100.0*y)
 }
 
+// LIX computes readability measure
+// (https://en.wikipedia.org/wiki/Lix_(readability_test)) .
+func (d *Document) LIX() float64 {
+	return (d.NumWords / d.NumSentences) + ((d.NumLongWords * 100) / d.NumWords)
+}
+
 // 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

summarize/summarize.go

@@ -53,6 +53,7 @@ type Document struct {
 	NumSentences    float64        // Number of sentences
 	NumSyllables    float64        // Number of syllables
 	NumWords        float64        // Number of words
+	NumLongWords    float64        // Number of long words
 	Sentences       []Sentence     // the Document's sentences
 	WordFrequency   map[string]int // [word]frequency
 
@@ -113,6 +114,9 @@ func (d *Document) Initialize() {
 				} else {
 					d.WordFrequency[word] = 1
 				}
+				if len(word) > 6 {
+					d.NumLongWords++
+				}
 				syllables := Syllables(word)
 				words = append(words, Word{Text: word, Syllables: syllables})
 				d.NumSyllables += float64(syllables)