private void TryAddEscapeSequence(char key, string value)
{
if (!EscapeSequences.ContainsKey(key))
{
EscapeSequences[key] = value;
}
}
private void BuildLookups(EncodingCharacters encoding)
{
SpecialCharacters[0] = encoding.FieldSeparator;
SpecialCharacters[1] = encoding.ComponentSeparator;
SpecialCharacters[2] = encoding.SubcomponentSeparator;
SpecialCharacters[3] = encoding.RepetitionSeparator;
SpecialCharacters[4] = encoding.EscapeCharacter;
SpecialCharacters[5] = TruncateChar;
SpecialCharacters[6] = LineFeed;
SpecialCharacters[7] = CarriageReturn;
for (var i = 0; i < Codes.Length; i++)
{
var seq = $"{encoding.EscapeCharacter}{Codes[i]}{encoding.EscapeCharacter}";
EscapeSequences.Add(SpecialCharacters[i], seq);
}
// Escaping of truncation # is not implemented yet. It may only be escaped if it is the first character that
// exceeds the conformance length of the component (ch 2.5.5.2). As of now, this information is not
// available at this place.
EscapeSequences.Add(TruncateChar, $"{TruncateChar}");
EscapeSequences.Add(LineFeed, $"\\{LineFeedHexadecimal}\\");
EscapeSequences.Add(CarriageReturn, $"\\{CarriageReturnHexadecimal}\\");
}
public static Lexeme Create(string value, int lineNumber, int index)
{
if (EscapeSequences.TryParse(value, out char result))
{
return(new CharLiteralLexeme(result, lineNumber, index));
}
else
{
return(new InvalidLexeme(value, ErrorCode.EscapeSequenceError, lineNumber, index));
}
}
private void TryAddEscapeSequence(char key, string value)
{
EscapeSequences.TryAdd(key, value);
}
