public static EncodedWord Concat(EncodedWord first, EncodedWord second)
{
if (first._charset != second._charset)
{
throw new InvalidOperationException("Both words must have the same charset");
}
if (first._encoding != second._encoding)
{
throw new InvalidOperationException("Both words must have the same encoding");
}
return(new EncodedWord(first._rawValue.TrimEnd('=') + second._rawValue, first._charset, first._encoding)
{
NextSeparator = second.NextSeparator, NextWord = second.NextWord
});
}
private static string OutputTokens(TokenBase token)
{
if (token == null)
{
return(string.Empty);
}
var nextSeparatorStringValue = token.NextSeparator != null?token.NextSeparator.GetStringValue() : string.Empty;
if (token is AsciiWord)
{
return(token.GetStringValue() + nextSeparatorStringValue + OutputTokens(token.NextWord));
}
if (token is EncodedWord)
{
var encodedWordToken = token as EncodedWord;
if (encodedWordToken.CanBeConcatenatedWith(encodedWordToken.NextWord))
{
return(OutputTokens(EncodedWord.Concat(encodedWordToken, encodedWordToken.NextWord as EncodedWord)));
}
if (encodedWordToken.NextWord is EncodedWord)
{
return(token.GetStringValue() + OutputTokens(token.NextWord));
}
return(token.GetStringValue() + nextSeparatorStringValue + OutputTokens(token.NextWord));
}
if (token is Separator)
{
if (token.NextWord is EncodedWord)
{
return(OutputTokens(token.NextWord));
}
return(token.GetStringValue() + OutputTokens(token.NextWord));
}
throw new InvalidOperationException("Unknown token type");
}