public LanguageTag[] Filter(LanguageTag[] languageTags)
{
List <LanguageTag> filteredLanguageTags = new List <LanguageTag>(Count);
foreach (var value in this)
{
LanguageTag matchingLanguageTag = null;
int? matchingLanguageTagSepcificy = null;
foreach (var languageTag in languageTags)
{
if (!filteredLanguageTags.Contains(languageTag) &&
Match(value, languageTag) &&
(matchingLanguageTagSepcificy == null || languageTag.Subtags.Length < matchingLanguageTagSepcificy))
{
matchingLanguageTagSepcificy = languageTag.Subtags.Length;
matchingLanguageTag = languageTag;
}
}
if (matchingLanguageTag != null)
{
filteredLanguageTags.Add(matchingLanguageTag);
}
}
return(filteredLanguageTags.ToArray());
}
public bool Match(LanguageTag languageTag)
{
switch (Type)
{
case LanguageRangeType.Extended:
return(ExtendedFilteringMatch(languageTag));
case LanguageRangeType.Basic:
default:
return(BasicFilteringMatch(languageTag));
}
}
public static bool Match(LanguageRange languageRange, LanguageTag languageTag)
{
if (languageRange.ToString() == "*" || string.Compare(languageRange.ToString(), languageTag.ToString(), StringComparison.InvariantCultureIgnoreCase) == 0)
{
return(true);
}
if (languageRange.Subtags.Length <= languageTag.Subtags.Length)
{
for (int i = 0; i < languageRange.Subtags.Length; i++)
{
if (string.Compare(languageRange.Subtags[i], languageTag.Subtags[i], StringComparison.InvariantCultureIgnoreCase) != 0)
{
return(false);
}
}
return(true);
}
return(false);
}
public bool BasicFilteringMatch(LanguageTag languageTag)
{
if (this.ToString() == "*" || string.Compare(this.ToString(), languageTag.ToString(), StringComparison.InvariantCultureIgnoreCase) == 0)
{
return(true);
}
if (this.Subtags.Length <= languageTag.Subtags.Length)
{
for (int i = 0; i < this.Subtags.Length; i++)
{
if (string.Compare(this.Subtags[i], languageTag.Subtags[i], StringComparison.InvariantCultureIgnoreCase) != 0)
{
return(false);
}
}
return(true);
}
return(false);
}
public bool ExtendedFilteringMatch(LanguageTag languageTag)
{
if (SubtagMatch(Subtags[0], languageTag.Subtags[0]))
{
int currentlanguageRangeSubTag = 1;
int currentlanguageTagSubTag = 1;
while (Subtags.GetUpperBound(0) <= currentlanguageRangeSubTag)
{
if (Subtags[currentlanguageRangeSubTag] == "*")
{
currentlanguageRangeSubTag++;
}
else if (languageTag.Subtags.GetUpperBound(0) < currentlanguageTagSubTag)
{
return(false);
}
else if (SubtagMatch(Subtags[currentlanguageRangeSubTag], languageTag.Subtags[currentlanguageTagSubTag]))
{
currentlanguageRangeSubTag++;
currentlanguageTagSubTag++;
}
else if (Regex.IsMatch(languageTag.Subtags[currentlanguageTagSubTag], @"^[\dA-Za-z]$"))
{
return(false);
}
else
{
currentlanguageTagSubTag++;
}
}
return(true);
}
return(false);
}
