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Copy pathTokenEnumeratorUtils.cs
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70 lines (52 loc) · 1.61 KB
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namespace NLanguageTag
{
internal static class TokenEnumeratorUtils
{
public static Language? TryParseLanguage(this TokenEnumerator tokens)
{
if (!tokens.NextTokenAvailable)
{
// No other tokens — try parsing current and return whatever we got
var result = Language.TryParse(tokens.CurrentToken);
if (result != null)
tokens.ToNextToken();
return result;
}
// Try parsing main language tag
var baseLanguage = Language.TryParse(tokens.CurrentToken);
if (baseLanguage is null)
return null;
tokens.ToNextToken();
if (!baseLanguage.ExtLanguageAvailable)
return baseLanguage;
// There may be extlang subtag here
var correctedLanguage = baseLanguage.TryParseExtLanguage(tokens.CurrentToken);
if (correctedLanguage is null)
return baseLanguage;
// There is, indeed, extlang subtag. Skip the reader over it and return proper language
tokens.ToNextToken();
return correctedLanguage;
}
public static Script? TryParseScript(this TokenEnumerator tokens)
{
var script = Script.TryParse(tokens.CurrentToken);
if (script != null)
tokens.ToNextToken();
return script;
}
public static Region? TryParseRegion(this TokenEnumerator tokens)
{
var region = Region.TryParse(tokens.CurrentToken);
if (region != null)
tokens.ToNextToken();
return region;
}
public static Variant? TryParseVariant(this TokenEnumerator tokens)
{
var variant = Variant.TryParse(tokens.CurrentToken);
if (variant != null)
tokens.ToNextToken();
return variant;
}
}
}