private bool ProcessHexString(CharReader charReader)
{
if (charReader.PeekChar() != '<')
{
return(false);
}
FlushTokenBuffer();
charReader.ReadChar();
var textBuilder = new StringBuilder();
while (true)
{
var character = charReader.ReadChar();
if (character == '>')
{
OnToken?.Invoke(TokenType.HexString, textBuilder.ToString());
return(true);
}
else if (character == '\0')
{
throw new Exception("Unexpected end of data.");
}
else if (IsBaseX(character, 16))
{
textBuilder.Append(character);
}
else if (IsWhitespace(character))
{
// Skip new line
}
else
{
throw new Exception("Invalid hex charcter.");
}
}
}
private bool ProcessXPacket(CharReader charReader)
{
if (!charReader.PeekLine().Equals("<?xpacket begin=\"\" id=\"W5M0MpCehiHzreSzNTczkc9d\"?>"))
{
return(false);
}
FlushTokenBuffer();
charReader.ReadLine();
var textBuilder = new StringBuilder();
while (true)
{
var line = charReader.ReadLine();
if (line.Equals("<?xpacket end=\"w\"?>"))
{
OnToken?.Invoke(TokenType.XPacket, textBuilder.ToString());
return(true);
}
else if (!string.IsNullOrEmpty(line))
{
textBuilder.AppendLine(line);
}
}
}
private bool ProcessString(CharReader charReader)
{
if (charReader.PeekChar() != '(')
{
return(false);
}
int bracketCount = 1;
FlushTokenBuffer();
charReader.ReadChar();
var textBuilder = new StringBuilder();
while (true)
{
var character = charReader.ReadChar();
if (character == '\\')
{
var peekedChar = charReader.PeekChar();
if (IsBaseX(peekedChar, 8))
{
var octalString = GetOctalString(charReader);
textBuilder.Append(octalString);
continue;
}
if (peekedChar == '\\' || peekedChar == '(' || peekedChar == ')')
{
textBuilder.Append(charReader.ReadChar());
continue;
}
if (peekedChar == 'n')
{
charReader.ReadChar();
textBuilder.Append('\n');
continue;
}
if (peekedChar == 'r')
{
charReader.ReadChar();
textBuilder.Append('\r');
continue;
}
if (peekedChar == 't')
{
charReader.ReadChar();
textBuilder.Append('\t');
continue;
}
if (peekedChar == 'b')
{
charReader.ReadChar();
textBuilder.Append('\b');
continue;
}
if (peekedChar == 'f')
{
charReader.ReadChar();
textBuilder.Append('\f');
continue;
}
throw new Exception("Unexpected escape code.");
}
else if (character == '(')
{
bracketCount++;
}
else if (character == ')' && bracketCount > 1)
{
bracketCount--;
}
else if (character == ')' && bracketCount == 1)
{
OnToken?.Invoke(TokenType.String, textBuilder.ToString());
return(true);
}
else if (character == '\0')
{
throw new Exception("Unexpected end of data.");
}
textBuilder.Append(character);
}
}