/// <summary>
/// Converts a language to its identifier.
/// </summary>
/// <param name="language">The language."</param>
/// <returns>The identifier or <see cref="string.Empty"/> if none.</returns>
private static string LanguageEnumToIdentifier
(string language)
{
string mode = string.Empty;
GoogleTranslator.EnsureInitialized();
GoogleTranslator._languageModeMap.TryGetValue(language, out mode);
return(mode);
}
/// <summary>
/// Translates the specified source text.
/// </summary>
/// <param name="sourceText">The source text.</param>
/// <param name="sourceLanguage">The source language.</param>
/// <param name="targetLanguage">The target language.</param>
/// <returns>The translation.</returns>
public async Task <string> Translate
(string sourceText,
string sourceLanguage,
string targetLanguage)
{
// Initialize
DateTime tmStart = DateTime.Now;
string text = string.Empty;
// Download translation
string url = string.Format("https://translate.googleapis.com/translate_a/single?client=gtx&sl={0}&tl={1}&dt=t&q={2}",
GoogleTranslator.LanguageEnumToIdentifier(sourceLanguage),
GoogleTranslator.LanguageEnumToIdentifier(targetLanguage),
HttpUtility.UrlEncode(sourceText));
using (HttpClient http = new HttpClient())
{
http.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36");
text = await http.GetStringAsync(url).ConfigureAwait(false);
}
return(string.Concat(JArray.Parse(text)[0].Select(x => x[0])));
}
/// <summary>
/// Translates the specified source text.
/// </summary>
/// <param name="sourceText">The source text.</param>
/// <param name="sourceLanguage">The source language.</param>
/// <param name="targetLanguage">The target language.</param>
/// <returns>The translation.</returns>
public string Translate
(string sourceText,
string sourceLanguage,
string targetLanguage)
{
// Initialize
this.Error = null;
this.TranslationSpeechUrl = null;
this.TranslationTime = TimeSpan.Zero;
DateTime tmStart = DateTime.Now;
string translation = string.Empty;
try
{
// Download translation
string url = string.Format("https://translate.googleapis.com/translate_a/single?client=gtx&sl={0}&tl={1}&dt=t&q={2}",
GoogleTranslator.LanguageEnumToIdentifier(sourceLanguage),
GoogleTranslator.LanguageEnumToIdentifier(targetLanguage),
HttpUtility.UrlEncode(sourceText));
string outputFile = Path.GetTempFileName();
using (WebClient wc = new WebClient())
{
wc.Headers.Add("user-agent", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36");
wc.DownloadFile(url, outputFile);
}
// Get translated text
if (File.Exists(outputFile))
{
// Get phrase collection
string text = File.ReadAllText(outputFile);
int index = text.IndexOf(string.Format(",,\"{0}\"", GoogleTranslator.LanguageEnumToIdentifier(sourceLanguage)));
if (index == -1)
{
// Translation of single word
int startQuote = text.IndexOf('\"');
if (startQuote != -1)
{
int endQuote = text.IndexOf('\"', startQuote + 1);
if (endQuote != -1)
{
translation = text.Substring(startQuote + 1, endQuote - startQuote - 1);
}
}
}
else
{
// Translation of phrase
text = text.Substring(0, index);
text = text.Replace("],[", ",");
text = text.Replace("]", string.Empty);
text = text.Replace("[", string.Empty);
text = text.Replace("\",\"", "\"");
// Get translated phrases
string[] phrases = text.Split(new[] { '\"' }, StringSplitOptions.RemoveEmptyEntries);
for (int i = 0; (i < phrases.Count()); i += 2)
{
string translatedPhrase = phrases[i];
if (translatedPhrase.StartsWith(",,"))
{
i--;
continue;
}
translation += translatedPhrase + " ";
}
}
// Fix up translation
translation = translation.Trim();
translation = translation.Replace(" ?", "?");
translation = translation.Replace(" !", "!");
translation = translation.Replace(" ,", ",");
translation = translation.Replace(" .", ".");
translation = translation.Replace(" ;", ";");
// And translation speech URL
this.TranslationSpeechUrl = string.Format("https://translate.googleapis.com/translate_tts?ie=UTF-8&q={0}&tl={1}&total=1&idx=0&textlen={2}&client=gtx",
HttpUtility.UrlEncode(translation), GoogleTranslator.LanguageEnumToIdentifier(targetLanguage), translation.Length);
}
}
catch (Exception ex)
{
this.Error = ex;
}
// Return result
this.TranslationTime = DateTime.Now - tmStart;
return(translation);
}