refactor: make translator to an interface

config.go

@@ -14,13 +14,14 @@ var (
 	hideBelow bool
 	// default config
 	defaultConfig = map[string]interface{}{
-		"transparent":             false,
-		"theme":                   "Gruvbox",
-		"source.language":         "English",
-		"source.borderColor":      "red",
-		"destination.language":    "Chinese (Traditional)",
-		"destination.borderColor": "blue",
-		"hide_below":              false,
+		"transparent":                 false,
+		"theme":                       "Gruvbox",
+		"source.borderColor":          "red",
+		"destination.borderColor":     "blue",
+		"source.google.language":      "English",
+		"destination.google.language": "Chinese (Traditional)",
+		"hide_below":                  false,
+		"translator":                  "google",
 	}
 )
 
@@ -62,15 +63,19 @@ func configInit() {
 	}
 
 	// setup
-	if len(*srcLangArg) > 0 {
-		translator.SrcLang = *srcLangArg
-	} else {
-		translator.SrcLang = config.GetString("source.language")
-	}
-	if len(*dstLangArg) > 0 {
-		translator.DstLang = *dstLangArg
-	} else {
-		translator.DstLang = config.GetString("destination.language")
+	switch config.GetString("translator") {
+	case "google":
+		translator = googleTranslate
+		if len(*srcLangArg) > 0 {
+			translator.SetSrcLang(*srcLangArg)
+		} else {
+			translator.SetSrcLang(config.GetString("source.google.language"))
+		}
+		if len(*dstLangArg) > 0 {
+			translator.SetDstLang(*dstLangArg)
+		} else {
+			translator.SetDstLang(config.GetString("destination.google.language"))
+		}
 	}
 	hideBelow = config.GetBool("hide_below")
 	style.Theme = config.GetString("theme")
@@ -85,15 +90,15 @@ func updateConfig() {
 
 	// Source language is not passed in argument
 	if len(*srcLangArg) == 0 &&
-		config.GetString("source.language") != translator.SrcLang {
+		config.GetString("source.google.language") != googleTranslate.GetSrcLang() {
 		changed = true
-		config.Set("source.language", translator.SrcLang)
+		config.Set("source.google.language", googleTranslate.GetSrcLang())
 	}
 	// Destination language is not passed in argument
 	if len(*dstLangArg) == 0 &&
-		config.GetString("destination.language") != translator.DstLang {
+		config.GetString("destination.google.language") != googleTranslate.GetDstLang() {
 		changed = true
-		config.Set("destination.language", translator.DstLang)
+		config.Set("destination.google.language", googleTranslate.GetDstLang())
 	}
 	if config.GetBool("hide_below") != hideBelow {
 		changed = true

internal/lock/lock.go

@@ -1,4 +1,4 @@
-package translate
+package lock
 
 type Lock struct {
 	Stop        bool

internal/translate/google/language.go

@@ -1,8 +1,8 @@
-package translate
+package google
 
 // https://cloud.google.com/translate/docs/languages
 var (
-	Lang = []string{
+	lang = []string{
 		"Afrikaans",
 		"Albanian",
 		"Amharic",
@@ -113,7 +113,7 @@ var (
 		"Yoruba",
 		"Zulu",
 	}
-	LangCode = map[string]string{
+	langCode = map[string]string{
 		"Afrikaans":                     "af",
 		"Albanian":                      "sq",
 		"Amharic":                       "am",

internal/translate/google/translator.go

@@ -0,0 +1,127 @@
+package google
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"gtt/internal/lock"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+)
+
+const (
+	textURL = "https://translate.googleapis.com/translate_a/single?client=gtx&dt=t&dt=bd&dt=md&dt=ex&sl=%s&tl=%s&q=%s"
+)
+
+type GoogleTranslate struct {
+	srcLang   string
+	dstLang   string
+	SoundLock *lock.Lock
+}
+
+func (t *GoogleTranslate) GetAllLang() []string {
+	return lang
+}
+
+func (t *GoogleTranslate) GetSrcLang() string {
+	return t.srcLang
+}
+
+func (t *GoogleTranslate) GetDstLang() string {
+	return t.dstLang
+}
+
+func (t *GoogleTranslate) SetSrcLang(srcLang string) {
+	t.srcLang = srcLang
+}
+
+func (t *GoogleTranslate) SetDstLang(dstLang string) {
+	t.dstLang = dstLang
+}
+
+func (t *GoogleTranslate) SwapLang() {
+	t.srcLang, t.dstLang = t.dstLang, t.srcLang
+}
+
+func (t *GoogleTranslate) Translate(message string) (
+	translation string,
+	definition string,
+	partOfSpeech string,
+	err error) {
+	var data []interface{}
+
+	urlStr := fmt.Sprintf(
+		textURL,
+		langCode[t.srcLang],
+		langCode[t.dstLang],
+		url.QueryEscape(message),
+	)
+	res, err := http.Get(urlStr)
+	if err != nil {
+		return "", "", "", err
+	}
+	body, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		return "", "", "", err
+	}
+
+	if err = json.Unmarshal(body, &data); err != nil {
+		return "", "", "", err
+	}
+
+	if len(data) > 0 {
+		// translation = data[0]
+		for _, lines := range data[0].([]interface{}) {
+			translatedLine := lines.([]interface{})[0]
+			translation += fmt.Sprintf("%v", translatedLine)
+		}
+
+		// part of speech = data[1]
+		if data[1] != nil {
+			for _, parts := range data[1].([]interface{}) {
+				// part of speech
+				part := parts.([]interface{})[0]
+				partOfSpeech += fmt.Sprintf("[%v]\n", part)
+				for _, words := range parts.([]interface{})[2].([]interface{}) {
+					// dst lang
+					dstWord := words.([]interface{})[0]
+					partOfSpeech += fmt.Sprintf("\t%v:", dstWord)
+					// src lang
+					firstWord := true
+					for _, word := range words.([]interface{})[1].([]interface{}) {
+						if firstWord {
+							partOfSpeech += fmt.Sprintf(" %v", word)
+							firstWord = false
+						} else {
+							partOfSpeech += fmt.Sprintf(", %v", word)
+						}
+					}
+					partOfSpeech += "\n"
+				}
+			}
+		}
+
+		// definition = data[12]
+		if len(data) >= 13 && data[12] != nil {
+			for _, parts := range data[12].([]interface{}) {
+				// part of speech
+				part := parts.([]interface{})[0]
+				definition += fmt.Sprintf("[%v]\n", part)
+				for _, sentences := range parts.([]interface{})[1].([]interface{}) {
+					// definition
+					def := sentences.([]interface{})[0]
+					definition += fmt.Sprintf("\t- %v\n", def)
+					// example sentence
+					if len(sentences.([]interface{})) >= 3 && sentences.([]interface{})[2] != nil {
+						example := sentences.([]interface{})[2]
+						definition += fmt.Sprintf("\t\t\"%v\"\n", example)
+					}
+				}
+			}
+		}
+		return translation, definition, partOfSpeech, nil
+	}
+
+	return "", "", "", errors.New("Translation not found")
+}

internal/translate/google/tts.go

@@ -0,0 +1,68 @@
+package google
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"time"
+
+	"github.com/hajimehoshi/go-mp3"
+	"github.com/hajimehoshi/oto/v2"
+)
+
+const (
+	ttsURL = "https://translate.google.com.vn/translate_tts?ie=UTF-8&q=%s&tl=%s&client=tw-ob"
+)
+
+func (t *GoogleTranslate) LockAvailable() bool {
+	return t.SoundLock.Available()
+}
+
+func (t *GoogleTranslate) LockAcquire() {
+	t.SoundLock.Acquire()
+}
+
+func (t *GoogleTranslate) StopTTS() {
+	t.SoundLock.Stop = true
+}
+
+func (t *GoogleTranslate) PlayTTS(lang string, message string) error {
+	urlStr := fmt.Sprintf(
+		ttsURL,
+		url.QueryEscape(message),
+		langCode[lang],
+	)
+	res, err := http.Get(urlStr)
+	if err != nil {
+		t.SoundLock.Release()
+		return err
+	}
+	decoder, err := mp3.NewDecoder(res.Body)
+	if err != nil {
+		t.SoundLock.Release()
+		return err
+	}
+	otoCtx, readyChan, err := oto.NewContext(decoder.SampleRate(), 2, 2)
+	if err != nil {
+		t.SoundLock.Release()
+		return err
+	}
+	<-readyChan
+	player := otoCtx.NewPlayer(decoder)
+	player.Play()
+	for player.IsPlaying() {
+		if t.SoundLock.Stop {
+			t.SoundLock.Release()
+			return nil
+		} else {
+			time.Sleep(time.Millisecond)
+		}
+	}
+	if err = player.Close(); err != nil {
+		t.SoundLock.Release()
+		return err
+	}
+
+	t.SoundLock.Release()
+	return nil
+}

internal/translate/translator.go

@@ -1,154 +1,32 @@
 package translate
 
 import (
-	"encoding/json"
-	"errors"
-	"fmt"
-	"io/ioutil"
-	"net/http"
-	"net/url"
-	"time"
-
-	"github.com/hajimehoshi/go-mp3"
-	"github.com/hajimehoshi/oto/v2"
+	"gtt/internal/lock"
+	"gtt/internal/translate/google"
 )
 
-const (
-	textURL  = "https://translate.googleapis.com/translate_a/single?client=gtx&dt=t&dt=bd&dt=md&dt=ex&sl=%s&tl=%s&q=%s"
-	soundURL = "https://translate.google.com.vn/translate_tts?ie=UTF-8&q=%s&tl=%s&client=tw-ob"
-)
-
-type Translator struct {
-	SrcLang   string
-	DstLang   string
-	SoundLock *Lock
+type Translator interface {
+	// text
+	GetAllLang() []string
+	GetSrcLang() string
+	GetDstLang() string
+	SetSrcLang(srcLang string)
+	SetDstLang(dstLang string)
+	SwapLang()
+	Translate(message string) (
+		translation string,
+		definition string,
+		partOfSpeech string,
+		err error)
+	// text to speech
+	LockAvailable() bool
+	LockAcquire()
+	StopTTS()
+	PlayTTS(lang string, message string) error
 }
 
-func NewTranslator() *Translator {
-	return &Translator{
-		SoundLock: NewLock(),
+func NewGoogleTranslate() *google.GoogleTranslate {
+	return &google.GoogleTranslate{
+		SoundLock: lock.NewLock(),
 	}
 }
-
-func (t *Translator) Translate(message string) (
-	translation string,
-	definition string,
-	partOfSpeech string,
-	err error) {
-	var data []interface{}
-
-	urlStr := fmt.Sprintf(
-		textURL,
-		LangCode[t.SrcLang],
-		LangCode[t.DstLang],
-		url.QueryEscape(message),
-	)
-	res, err := http.Get(urlStr)
-	if err != nil {
-		return "", "", "", err
-	}
-	body, err := ioutil.ReadAll(res.Body)
-	if err != nil {
-		return "", "", "", err
-	}
-
-	if err = json.Unmarshal(body, &data); err != nil {
-		return "", "", "", err
-	}
-
-	if len(data) > 0 {
-		// translation = data[0]
-		for _, lines := range data[0].([]interface{}) {
-			translatedLine := lines.([]interface{})[0]
-			translation += fmt.Sprintf("%v", translatedLine)
-		}
-
-		// part of speech = data[1]
-		if data[1] != nil {
-			for _, parts := range data[1].([]interface{}) {
-				// part of speech
-				part := parts.([]interface{})[0]
-				partOfSpeech += fmt.Sprintf("[%v]\n", part)
-				for _, words := range parts.([]interface{})[2].([]interface{}) {
-					// dst lang
-					dstWord := words.([]interface{})[0]
-					partOfSpeech += fmt.Sprintf("\t%v:", dstWord)
-					// src lang
-					firstWord := true
-					for _, word := range words.([]interface{})[1].([]interface{}) {
-						if firstWord {
-							partOfSpeech += fmt.Sprintf(" %v", word)
-							firstWord = false
-						} else {
-							partOfSpeech += fmt.Sprintf(", %v", word)
-						}
-					}
-					partOfSpeech += "\n"
-				}
-			}
-		}
-
-		// definition = data[12]
-		if len(data) >= 13 && data[12] != nil {
-			for _, parts := range data[12].([]interface{}) {
-				// part of speech
-				part := parts.([]interface{})[0]
-				definition += fmt.Sprintf("[%v]\n", part)
-				for _, sentences := range parts.([]interface{})[1].([]interface{}) {
-					// definition
-					def := sentences.([]interface{})[0]
-					definition += fmt.Sprintf("\t- %v\n", def)
-					// example sentence
-					if len(sentences.([]interface{})) >= 3 && sentences.([]interface{})[2] != nil {
-						example := sentences.([]interface{})[2]
-						definition += fmt.Sprintf("\t\t\"%v\"\n", example)
-					}
-				}
-			}
-		}
-		return translation, definition, partOfSpeech, nil
-	}
-
-	return "", "", "", errors.New("Translation not found")
-}
-
-func (t *Translator) PlaySound(lang string, message string) error {
-	urlStr := fmt.Sprintf(
-		soundURL,
-		url.QueryEscape(message),
-		LangCode[lang],
-	)
-	res, err := http.Get(urlStr)
-	if err != nil {
-		t.SoundLock.Release()
-		return err
-	}
-	decoder, err := mp3.NewDecoder(res.Body)
-	if err != nil {
-		t.SoundLock.Release()
-		return err
-	}
-	otoCtx, readyChan, err := oto.NewContext(decoder.SampleRate(), 2, 2)
-	if err != nil {
-		t.SoundLock.Release()
-		return err
-	}
-	<-readyChan
-	player := otoCtx.NewPlayer(decoder)
-	player.Play()
-	for player.IsPlaying() {
-		if t.SoundLock.Stop {
-			t.SoundLock.Release()
-			return nil
-		} else {
-			time.Sleep(time.Millisecond)
-		}
-	}
-	if err = player.Close(); err != nil {
-		t.SoundLock.Release()
-		return err
-	}
-
-	t.SoundLock.Release()
-	return nil
-}

main.go

@@ -15,7 +15,8 @@ var (
 	srcLangArg *string = flag.String("src", "", "Set source language")
 	dstLangArg *string = flag.String("dst", "", "Set destination language")
 	// Translate
-	translator = translate.NewTranslator()
+	translator      translate.Translator
+	googleTranslate = translate.NewGoogleTranslate()
 	// UI
 	app                 = tview.NewApplication()
 	srcInput            = tview.NewTextArea()

ui.go

@@ -3,7 +3,6 @@ package main
 import (
 	"fmt"
 	"gtt/internal/color"
-	"gtt/internal/translate"
 	"strconv"
 
 	"github.com/gdamore/tcell/v2"
@@ -172,16 +171,14 @@ func updateAllColor() {
 
 // Update title and option
 func updateTitle() {
-	srcInput.SetTitle(translator.SrcLang)
-	dstOutput.SetTitle(translator.DstLang)
+	srcInput.SetTitle(translator.GetSrcLang())
+	dstOutput.SetTitle(translator.GetDstLang())
 	srcLangDropDown.SetCurrentOption(
-		IndexOf(translator.SrcLang,
-			translate.Lang)).
-		SetTitle(translator.SrcLang)
+		IndexOf(translator.GetSrcLang(), translator.GetAllLang())).
+		SetTitle(translator.GetSrcLang())
 	dstLangDropDown.SetCurrentOption(
-		IndexOf(translator.DstLang,
-			translate.Lang)).
-		SetTitle(translator.DstLang)
+		IndexOf(translator.GetDstLang(), translator.GetAllLang())).
+		SetTitle(translator.GetDstLang())
 }
 
 func attachButton() *tview.Flex {
@@ -204,7 +201,7 @@ func uiInit() {
 
 	// dropdown
 	for _, langDropDown := range []*tview.DropDown{srcLangDropDown, dstLangDropDown} {
-		langDropDown.SetOptions(translate.Lang, nil).
+		langDropDown.SetOptions(translator.GetAllLang(), nil).
 			SetBorder(true)
 	}
 	themeDropDown.SetLabel("Theme: ").
@@ -323,13 +320,13 @@ func uiInit() {
 	keyMapWindow.SetInputCapture(popOutWindowHandler)
 	srcLangDropDown.SetDoneFunc(langDropDownHandler).
 		SetSelectedFunc(func(text string, index int) {
-			translator.SrcLang = text
+			translator.SetSrcLang(text)
 			srcInput.SetTitle(text)
 			srcLangDropDown.SetTitle(text)
 		})
 	dstLangDropDown.SetDoneFunc(langDropDownHandler).
 		SetSelectedFunc(func(text string, index int) {
-			translator.DstLang = text
+			translator.SetDstLang(text)
 			dstOutput.SetTitle(text)
 			dstLangDropDown.SetTitle(text)
 		})
@@ -444,7 +441,7 @@ func translateWindowHandler(event *tcell.EventKey) *tcell.EventKey {
 			CopyToClipboard(text[:len(text)-1])
 		}
 	case tcell.KeyCtrlS:
-		translator.SrcLang, translator.DstLang = translator.DstLang, translator.SrcLang
+		translator.SwapLang()
 		updateTitle()
 		srcText := srcInput.GetText()
 		dstText := dstOutput.GetText(false)
@@ -457,13 +454,13 @@ func translateWindowHandler(event *tcell.EventKey) *tcell.EventKey {
 		dstOutput.SetText(srcText)
 	case tcell.KeyCtrlO:
 		// Play source sound
-		if translator.SoundLock.Available() {
+		if translator.LockAvailable() {
 			message := srcInput.GetText()
 			// Only play when message exist
 			if len(message) > 0 {
-				translator.SoundLock.Acquire()
+				translator.LockAcquire()
 				go func() {
-					err := translator.PlaySound(translator.SrcLang, message)
+					err := translator.PlayTTS(translator.GetSrcLang(), message)
 					if err != nil {
 						srcInput.SetText(err.Error(), true)
 					}
@@ -473,13 +470,13 @@ func translateWindowHandler(event *tcell.EventKey) *tcell.EventKey {
 		}
 	case tcell.KeyCtrlP:
 		// Play destination sound
-		if translator.SoundLock.Available() {
+		if translator.LockAvailable() {
 			message := dstOutput.GetText(false)
 			// Only play when message exist
 			if len(message) > 0 {
-				translator.SoundLock.Acquire()
+				translator.LockAcquire()
 				go func() {
-					err := translator.PlaySound(translator.DstLang, message)
+					err := translator.PlayTTS(translator.GetDstLang(), message)
 					if err != nil {
 						dstOutput.SetText(err.Error())
 					}
@@ -488,7 +485,7 @@ func translateWindowHandler(event *tcell.EventKey) *tcell.EventKey {
 		}
 	case tcell.KeyCtrlX:
 		// Stop play sound
-		translator.SoundLock.Stop = true
+		translator.StopTTS()
 	}
 
 	return event