public static bool TryBuildEscapeSequenceFormatToken(char escapeCode, string formatString, int offset, int length, out ILispFormatToken token, out string errorMessage)
{
token = default;
switch (char.ToLowerInvariant(escapeCode))
{
case LispFormatTokenTilde.EscapeCode:
if (LispFormatTokenTilde.TryCreateTildeToken(formatString, offset, length, out var tildeToken, out errorMessage))
{
token = tildeToken;
return(true);
}
break;
case LispFormatTokenNewLine.EscapeCode:
if (LispFormatTokenNewLine.TryCreateNewLineToken(formatString, offset, length, out var newlineToken, out errorMessage))
{
token = newlineToken;
return(true);
}
break;
case LispFormatTokenLineStart.EscapeCode:
if (LispFormatTokenLineStart.TryCreateLineStartToken(formatString, offset, length, out var lineStartToken, out errorMessage))
{
token = lineStartToken;
return(true);
}
break;
case LispFormatTokenAExpression.EscapeCode:
if (LispFormatTokenAExpression.TryCreateAExpressionToken(formatString, offset, length, out var aToken, out errorMessage))
{
token = aToken;
return(true);
}
break;
case LispFormatTokenSExpression.EscapeCode:
if (LispFormatTokenSExpression.TryCreateSExpressionToken(formatString, offset, length, out var sToken, out errorMessage))
{
token = sToken;
return(true);
}
break;
default:
errorMessage = $"Unsuppored escape code '{escapeCode}'";
break;
}
return(false);
}
public static bool TryCreateLineStartToken(string formatString, int offset, int length, out LispFormatTokenLineStart token, out string errorMessage)
{
token = default;
errorMessage = default;
if (length != 2)
{
errorMessage = "Expected no format arguments";
return(false);
}
token = new LispFormatTokenLineStart(offset, length);
return(true);
}
