/// <summary>
/// Creates a translation dictionary between <paramref name="srcLanguage"/> and <paramref name="tgtLanguage"/> by:
/// - downloading the appropriate files
/// - extracting information from them
/// - associating the info of the different files
/// </summary>
/// <param name="srcLanguage">The ISO-639-1 code for the source language</param>
/// <param name="tgtLanguage">The ISO-639-1 code for the target language</param>
/// <param name="wikimedia">The wikipedia resource (wikipedia, witionary...)</param>
/// <returns>The collection of translated entities</returns>
public string CreateDictionary(string srcLanguage, string tgtLanguage, Wikimedia wikimedia, DumpDownloader dumpDownloader)
{
Console.WriteLine("Start creating dictionary {0}-{1}", srcLanguage, tgtLanguage);
// Creates the output file name
var outputFilePath = PathToProject + string.Format("Output\\{0}-{1}-{2}-dictionary.txt",
srcLanguage, tgtLanguage, Enum.GetName(typeof(Wikimedia), wikimedia));
TranslatedEntities translatedEntities;
if (wikimedia == Wikimedia.Wikipedia)
{
// Creates the dictionary from the language links between the pages
translatedEntities = ExtractTranslatedEntitiesFromLanguageLinks(srcLanguage, tgtLanguage, wikimedia, dumpDownloader);
}
else if (wikimedia == Wikimedia.Wiktionary)
{
// Creates the dictionary from the content of wiktionary pages (a translation section is sometimes present on wiktionary)
translatedEntities = ExtractTranslatedEntitiesFromWiktionaryContent(srcLanguage, tgtLanguage, wikimedia, dumpDownloader);
}
else
{
throw new ArgumentException(string.Format("Wikimedia '{0}' is not supported for building translation dictionaries", Enum.GetName(typeof(Wikimedia), wikimedia)));
}
// Write all translated entities
if (File.Exists(outputFilePath))
{
File.Delete(outputFilePath);
}
File.AppendAllLines(outputFilePath, translatedEntities.GetTextFileLines());
Console.WriteLine("Finished creating dictionary {0}-{1}", srcLanguage, tgtLanguage);
Console.WriteLine("----");
return(outputFilePath);
}
/// <summary>
/// Creates a translation dictionary from languagelinks for a wikimedia resource. Language links are a specific kind of
/// interwikilinks (ie links between two different domains - en.wikipedia.org and fr.wikipedia.org for instance).
/// See https://en.wiktionary.org/wiki/Help:FAQ#What_are_interwiki_links.3F for more details.
/// </summary>
/// <param name="srcLanguage">The ISO-639-1 code for the source language</param>
/// <param name="tgtLanguage">The ISO-639-1 code for the target language</param>
/// <param name="wikimedia">The wikipedia resource (wikipedia, witionary...)</param>
/// <returns>The collection of translated entities</returns>
private TranslatedEntities ExtractTranslatedEntitiesFromLanguageLinks(string srcLanguage, string tgtLanguage, Wikimedia wikimedia, DumpDownloader dumpDownloader)
{
var translatedEntities = new TranslatedEntities()
{
SrcLanguage = srcLanguage,
TgtLanguage = tgtLanguage,
Entities = new List <TranslatedEntity>()
};
// Download dump files with pages and langlinks of the source language (always take the latest version)
var pageDumpFileName = string.Format("{0}{1}-latest-page.sql.gz", srcLanguage, GetWikimediaExtension(wikimedia));
var srcPagePropsFilePath = dumpDownloader.DownloadFile(pageDumpFileName);
var langLinksDumpFileName = string.Format("{0}{1}-latest-langlinks.sql.gz", srcLanguage, GetWikimediaExtension(wikimedia));
var srcLangLinksFilePath = dumpDownloader.DownloadFile(langLinksDumpFileName);
// Parse language links and load them in dictionary for fast retrieval
Console.WriteLine("Start parsing language links");
var parser = new DumpParser();
var languageLinks = parser.ParseLanguageLinks(srcLangLinksFilePath, tgtLanguage)
.ToDictionary(ll => ll.Id, ll => ll);
Console.WriteLine("{0} language links found", languageLinks.Count());
// Associate the pages (with title in src language) with the language links (with title in tgt language)
Console.WriteLine("Start associating pages and language links");
var counter = 0;
var pageInfoReader = new SqlDumpFileReader(srcPagePropsFilePath);
var pageInfo = pageInfoReader.ReadNext();
while (pageInfo != null)
{
LanguageLink languageLink;
if (languageLinks.TryGetValue(pageInfo.Id, out languageLink))
{
counter++;
translatedEntities.Entities.Add(new TranslatedEntity()
{
SrcName = pageInfo.GetDisplayedTitle(),
TgtName = languageLink.GetDisplayedTitle()
});
}
pageInfo = pageInfoReader.ReadNext();
}
Console.WriteLine("Associated {0} entries for {1}-{2}", counter, srcLanguage, tgtLanguage);
return(translatedEntities);
}
private TranslatedEntities ExtractTranslatedEntitiesFromWiktionaryContent(string srcLanguage, string tgtLanguage,
Wikimedia wikimedia, DumpDownloader dumpDownloader)
{
// Download dump files with pages and langlinks of the source language (always take the latest version)
var pagesDumpFileName = string.Format("{0}{1}-latest-pages-meta-current.xml.bz2", srcLanguage, GetWikimediaExtension(wikimedia));
var srcPageFilePath = dumpDownloader.DownloadFile(pagesDumpFileName);
var parser = new WiktionaryDumpParser.Src.WiktionaryDumpParser();
var translatedEntities = parser.ExtractTranslatedEntities(srcPageFilePath, srcLanguage, tgtLanguage);
return(translatedEntities);
}