forked from advancedlogic/GoOse
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stopwords.go
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stopwords.go
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package goose
import (
"io/ioutil"
"log"
"regexp"
"strings"
"github.com/fatih/set"
)
var punctuationRegex = regexp.MustCompile(`[^\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}\s]`)
// StopWords implements a simple language detector
type StopWords struct {
cachedStopWords map[string]*set.Set
}
// NewStopwords returns an instance of a stop words detector
func NewStopwords() StopWords {
cachedStopWords := make(map[string]*set.Set)
for lang, stopwords := range sw {
lines := strings.Split(stopwords, "\n")
cachedStopWords[lang] = set.New(set.ThreadSafe).(*set.Set)
for _, line := range lines {
if strings.HasPrefix(line, "#") {
continue
}
line = strings.TrimSpace(line)
cachedStopWords[lang].Add(line)
}
}
return StopWords{
cachedStopWords: cachedStopWords,
}
}
/*
func NewStopwords(path string) StopWords {
cachedStopWords := make(map[string]*set.Set)
files, err := ioutil.ReadDir(path)
if err != nil {
panic(err.Error())
}
for _, file := range files {
name := strings.Replace(file.Name(), ".txt", "", -1)
name = strings.Replace(name, "stopwords-", "", -1)
name = strings.ToLower(name)
stops := set.New()
lines := ReadLinesOfFile(path + "/" + file.Name())
for _, line := range lines {
line = strings.Trim(line, " ")
stops.Add(line)
}
cachedStopWords[name] = stops
}
return StopWords{
cachedStopWords: cachedStopWords,
}
}
*/
func (stop *StopWords) removePunctuation(text string) string {
return punctuationRegex.ReplaceAllString(text, "")
}
func (stop *StopWords) stopWordsCount(lang string, text string) wordStats {
if text == "" {
return wordStats{}
}
ws := wordStats{}
stopWords := set.New(set.ThreadSafe).(*set.Set)
text = strings.ToLower(text)
items := strings.Split(text, " ")
stops := stop.cachedStopWords[lang]
count := 0
if stops != nil {
for _, item := range items {
if stops.Has(item) {
stopWords.Add(item)
count++
}
}
}
ws.stopWordCount = stopWords.Size()
ws.wordCount = len(items)
ws.stopWords = stopWords
return ws
}
// SimpleLanguageDetector returns the language code for the text, based on its stop words
func (stop StopWords) SimpleLanguageDetector(text string) string {
max := 0
currentLang := "en"
for k := range sw {
ws := stop.stopWordsCount(k, text)
if ws.stopWordCount > max {
max = ws.stopWordCount
currentLang = k
}
}
return currentLang
}
// ReadLinesOfFile returns the lines from a file as a slice of strings
func ReadLinesOfFile(filename string) []string {
content, err := ioutil.ReadFile(filename)
if err != nil {
log.Println(err.Error())
}
lines := strings.Split(string(content), "\n")
return lines
}
var sw = map[string]string{
"ar": `
فى
في
كل
لم
لن
له
من
هو
هي
قوة
كما
لها
منذ
وقد
ولا
نفسه
لقاء
مقابل
هناك
وقال
وكان
نهاية
وقالت
وكانت
للامم
فيه
كلم
لكن
وفي
وقف
ولم
ومن
وهو
وهي
يوم
فيها
منها
مليار
لوكالة
يكون
يمكن
مليون
حيث
اكد
الا
اما
امس
السابق
التى
التي
اكثر
ايار
ايضا
ثلاثة
الذاتي
الاخيرة
الثاني
الثانية
الذى
الذي
الان
امام
ايام
خلال
حوالى
الذين
الاول
الاولى
بين
ذلك
دون
حول
حين
الف
الى
انه
اول
ضمن
انها
جميع
الماضي
الوقت
المقبل
اليوم
ـ
ف
و
و6
قد
لا
ما
مع
مساء
هذا
واحد
واضاف
واضافت
فان
قبل
قال
كان
لدى
نحو
هذه
وان
واكد
كانت
واوضح
مايو
ب
ا
أ
،
عشر
عدد
عدة
عشرة
عدم
عام
عاما
عن
عند
عندما
على
عليه
عليها
زيارة
سنة
سنوات
تم
ضد
بعد
بعض
اعادة
اعلنت
بسبب
حتى
اذا
احد
اثر
برس
باسم
غدا
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صباح
اطار
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اخرى
بان
اجل
غير
بشكل
حاليا
بن
به
ثم
اف
ان
او
اي
بها
صفر
`,
"en": `
a's
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`,
"es": `
de
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