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text_cleaner.go
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text_cleaner.go
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package text_cleaner
import (
"bufio"
"os"
"strings"
"unicode"
error_handler "github.com/kartik-dutt/Simple-Search-Engine/src/error_handler"
snowballeng "github.com/kljensen/snowball/english"
)
func Tokenize(text string) []string {
return strings.FieldsFunc(text, func(r rune) bool {
return !unicode.IsLetter(r) && !unicode.IsNumber(r)
})
}
func ToLowerCase(tokens []string) []string {
for i, token := range tokens {
tokens[i] = strings.ToLower(token)
}
return tokens
}
func ReadWordsFromTxt(path string) ([]string, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
scanner := bufio.NewScanner(file)
scanner.Split(bufio.ScanWords)
var words []string
for scanner.Scan() {
words = append(words, scanner.Text())
}
return words, nil
}
func RemoveStopWords(tokens []string) []string {
stopWords, err := ReadWordsFromTxt("../data/stop_words.txt")
if err != nil {
error_handler.ErrorHandler("Error reading stop words", err)
}
stopWordsSet := make(map[string]struct{})
for _, stopWord := range stopWords {
stopWordsSet[stopWord] = struct{}{}
}
res := make([]string, 0)
for _, token := range tokens {
if _, exists := stopWordsSet[token]; !exists {
res = append(res, token)
}
}
return res
}
func StemTokens(tokens []string) []string {
r := make([]string, len(tokens))
for i, token := range tokens {
r[i] = snowballeng.Stem(token, false)
}
return r
}
func TextCleaner(text string) []string {
tokens := Tokenize(text)
tokens = ToLowerCase(tokens)
tokens = RemoveStopWords(tokens)
tokens = StemTokens(tokens)
return tokens
}