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words.go
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words.go
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package pkg
import (
"bufio"
"fmt"
"io"
"net/http"
"os"
"strings"
)
const (
//Url = "https://github.com/ylogx/english-words/blob/master/words.txt?raw=true"
//FileSize = 4862966
//FileName = "gophrase_words_all.txt"
//Url = "https://github.com/ylogx/english-words/blob/master/20k.txt?raw=true"
//FileSize = 155418
//FileName = "/tmp/20k.txt"
Url = "https://github.com/ylogx/english-words/blob/master/google-10000-english-no-swears.txt?raw=true"
FileSize = 75185
FileName = "/tmp/google-10000-english-no-swears.txt"
WordMinLength = 1 //3
WordMaxLength = 100 //10
)
type Vocabulary interface {
words() []string
size() int
}
type english struct {
filename string
wordsData []string
WordMinLength int
WordMaxLength int
}
func NewEnglishVocabulary(filename string) Vocabulary {
return &english{
filename: filename,
wordsData: []string{},
WordMinLength: WordMinLength,
WordMaxLength: WordMaxLength,
}
}
func (e *english) words() []string {
e.ensureWordListExists()
return e.wordsData
}
func (e *english) size() int {
e.ensureWordListExists()
return len(e.wordsData)
}
// DownloadFile will download a url to a local file. It's efficient because it will
// write as it downloads and not load the whole file into memory.
func DownloadFile(filepath string, url string) error {
// Create the file
out, err := os.Create(filepath)
if err != nil {
return err
}
defer out.Close()
// Get the data
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
// Write the body to file
_, err = io.Copy(out, resp.Body)
if err != nil {
return err
}
return nil
}
// Knows the url and corresponding file size
func (e *english) ensureWordListExists() error {
if len(e.wordsData) > 0 {
return nil
}
fileInfo, err := os.Stat(e.filename)
if err != nil || fileInfo.Size() != FileSize {
fmt.Printf("Downloading file (this will only take few seconds)\n")
err = DownloadFile(e.filename, Url)
if err != nil {
return err
}
fmt.Printf("Finished Downloading Successfully\n")
}
e.readWordsFromFile()
return nil
}
func (e *english) readWordsFromFile() {
file, err := os.Open(e.filename)
if err != nil {
panic(err)
}
reader := bufio.NewReader(file)
for {
//word, err := reader.ReadString(10) // 0x0A separator = newline
word, err := reader.ReadString(0x0A)
if err == io.EOF {
break
} else if err != nil {
panic(err) // if you return error
}
word = string(word)
word = strings.TrimSuffix(word, "\r\n")
word = strings.TrimSuffix(word, "\n")
if e.WordMinLength <= len(word) && len(word) <= e.WordMaxLength {
e.wordsData = append(e.wordsData, word)
}
}
//words, err := ioutil.ReadFile(FileName)
if err != nil {
panic(err)
}
}