private static TerminalSequence ConsumeEscapeSequence(XTermInputBuffer stream)
{
stream.PushState();
var next = stream.Read();
switch (next)
{
case '[':
return(ConsumeCSI(stream));
case ']':
return(ConsumeOSC(stream));
case 'P':
return(ConsumeDeviceControlStringSequence(stream));
case '#':
return(ConsumeCharacterSize(stream));
case ' ':
return(ConsumeCompliance(stream));
case '%':
return(ConsumeUnicode(stream));
case '(':
case ')':
case '*':
case '+':
case '-':
case '.':
case '/':
return(ConsumeCharacterSet(next, stream));
case 'Y':
var vt52mc = new Vt52MoveCursorSequence
{
Row = stream.ReadRaw() - ' ',
Column = stream.ReadRaw() - ' '
};
stream.Commit();
System.Diagnostics.Debug.WriteLine(vt52mc.ToString());
return(vt52mc);
default:
var esc = new EscapeSequence
{
Command = next.ToString()
};
stream.Commit();
//System.Diagnostics.Debug.WriteLine(esc.ToString());
return(esc);
}
}
public static TerminalSequence ConsumeNextSequence(XTermInputBuffer stream, bool utf8)
{
stream.PushState();
var next = stream.Read(utf8);
TerminalSequence sequence = null;
switch (next)
{
case '\u001b': // ESC
sequence = ConsumeEscapeSequence(stream);
break;
case '\u008e': // SS2
sequence = ConsumeSS2Sequence(stream);
break;
case '\u008f': // SS3
sequence = ConsumeSS3Sequence(stream);
break;
case '\u0090': // DCS
sequence = ConsumeDeviceControlStringSequence(stream);
break;
default:
break;
}
if (sequence == null)
{
sequence = new CharacterSequence
{
Character = next
};
stream.Commit();
}
return(sequence);
}
private static TerminalSequence ConsumeDeviceControlStringSequence(XTermInputBuffer stream)
{
stream.PushState();
string command = "";
bool readingCommand = false;
bool atStart = true;
bool isQuery = false;
bool isSend = false;
bool isBang = false;
char? modifier = null;
int currentParameter = -1;
List <int> Parameters = new List <int>();
while (!stream.AtEnd)
{
var next = stream.Read();
if (readingCommand)
{
if (next == 0x07 || next == 0x9C) // BEL or ST
{
var dcs = new DcsSequence
{
Parameters = Parameters,
IsQuery = isQuery,
IsSend = isSend,
IsBang = isBang,
Command = (modifier.HasValue ? modifier.Value.ToString() : "") + command
};
stream.Commit();
//System.Diagnostics.Debug.WriteLine(dcs.ToString());
return(dcs);
}
else if (next == 0x1B) // ESC
{
var stChar = stream.Read();
if (stChar == '\\')
{
var dcs = new DcsSequence
{
Parameters = Parameters,
IsQuery = isQuery,
IsSend = isSend,
IsBang = isBang,
Command = (modifier.HasValue ? modifier.Value.ToString() : "") + command
};
stream.Commit();
//System.Diagnostics.Debug.WriteLine(dcs.ToString());
return(dcs);
}
else
{
throw new EscapeSequenceException("ESC \\ is needed to terminate DCS. Encounterd wrong character.", stream.Stacked);
}
}
else
{
command += next;
}
}
else
{
if (atStart && next == '?')
{
isQuery = true;
}
else if (atStart && next == '>')
{
isSend = true;
}
else if (atStart && next == '!')
{
isBang = true;
}
else if (next == ';')
{
if (currentParameter == -1)
{
throw new EscapeSequenceException("Invalid position for ';' in DCS", stream.Stacked);
}
Parameters.Add(currentParameter);
currentParameter = -1;
}
else if (char.IsDigit(next))
{
atStart = false;
if (currentParameter == -1)
{
currentParameter = Convert.ToInt32(next - '0');
}
else
{
currentParameter = (currentParameter * 10) + Convert.ToInt32(next - '0');
}
}
else if (next == '$' || next == '"' || next == ' ')
{
if (modifier.HasValue)
{
throw new EscapeSequenceException("There appears to be two modifiers in a row", stream.Stacked);
}
if (currentParameter != -1)
{
Parameters.Add(currentParameter);
currentParameter = -1;
}
modifier = next;
}
else
{
if (currentParameter != -1)
{
Parameters.Add(currentParameter);
currentParameter = -1;
}
command += next;
readingCommand = true;
}
}
}
stream.PopState();
return(null);
}
private static TerminalSequence ConsumeOSC(XTermInputBuffer stream)
{
stream.PushState();
string command = "";
bool readingCommand = false;
bool atStart = true;
bool isQuery = false;
bool isSend = false;
bool isBang = false;
char? modifier = null;
int currentParameter = -1;
List <int> Parameters = new List <int>();
while (true)
{
if (stream.AtEnd)
{
return(null);
}
var next = stream.Read();
if (readingCommand)
{
if (next == 0x07 || next == 0x9C) // BEL or ST
{
var osc = new OscSequence
{
Parameters = Parameters,
IsQuery = isQuery,
IsSend = isSend,
IsBang = isBang,
Command = command
};
stream.Commit();
//System.Diagnostics.Debug.WriteLine(osc.ToString());
return(osc);
}
else
{
command += next;
}
}
else
{
if (atStart && next == '?')
{
isQuery = true;
}
else if (atStart && next == '>')
{
isSend = true;
}
else if (atStart && next == '!')
{
isBang = true;
}
else if (next == ';')
{
if (currentParameter == -1)
{
throw new EscapeSequenceException("Invalid position for ';' in OSC", stream.Stacked);
}
Parameters.Add(currentParameter);
currentParameter = -1;
}
else if (char.IsDigit(next))
{
atStart = false;
if (currentParameter == -1)
{
currentParameter = Convert.ToInt32(next - '0');
}
else
{
currentParameter = (currentParameter * 10) + Convert.ToInt32(next - '0');
}
}
else if (next == '$' || next == '"' || next == ' ')
{
if (modifier.HasValue)
{
throw new EscapeSequenceException("There appears to be two modifiers in a row", stream.Stacked);
}
if (currentParameter != -1)
{
Parameters.Add(currentParameter);
currentParameter = -1;
}
modifier = next;
}
else
{
if (currentParameter != -1)
{
Parameters.Add(currentParameter);
currentParameter = -1;
}
command += next;
readingCommand = true;
}
}
}
}
private static TerminalSequence ConsumeCSI(XTermInputBuffer stream)
{
stream.PushState();
bool atStart = true;
bool isQuery = false;
bool isSend = false;
bool isBang = false;
char?modifier = null;
int currentParameter = -1;
List <int> Parameters = new List <int>();
List <TerminalSequence> ProcesFirst = new List <TerminalSequence>();
while (true)
{
var next = stream.Read();
if (atStart && next == '?')
{
isQuery = true;
}
else if (atStart && next == '>')
{
isSend = true;
}
else if (atStart && next == '!')
{
isBang = true;
}
else if (next == ';')
{
if (currentParameter == -1)
{
//currentParameter = 1; // ctrlseqs.txt seems to always default to 1 here. Might not be a great idea
atStart = false;
//throw new EscapeSequenceException("Invalid position for ';' in CSI", stream.Stacked);
}
Parameters.Add(currentParameter);
currentParameter = -1;
}
else if (char.IsDigit(next))
{
atStart = false;
if (currentParameter == -1)
{
currentParameter = Convert.ToInt32(next - '0');
}
else
{
currentParameter = (currentParameter * 10) + Convert.ToInt32(next - '0');
}
}
else if (next == '$' || next == '"' || next == ' ' || next == '\'')
{
if (modifier.HasValue)
{
throw new EscapeSequenceException("There appears to be two modifiers in a row", stream.Stacked);
}
if (currentParameter != -1)
{
Parameters.Add(currentParameter);
currentParameter = -1;
}
modifier = next;
}
else if (next == '\b' || next == '\r' || next == '\u000B')
{
// Trash chars that have to be processed before this sequence
ProcesFirst.Add(
new CharacterSequence
{
Character = next
}
);
}
else if (next == '\0')
{
// Trash null characters. Telnet is injecting them after carriage returns for
// some horrible reason
}
else
{
if (currentParameter != -1)
{
Parameters.Add(currentParameter);
currentParameter = -1;
}
var csi = new CsiSequence
{
Parameters = Parameters,
IsQuery = isQuery,
IsSend = isSend,
IsBang = isBang,
Command = (modifier.HasValue ? modifier.Value.ToString() : "") + next.ToString(),
ProcessFirst = ProcesFirst.Count > 0 ? ProcesFirst : null
};
stream.Commit();
//System.Diagnostics.Debug.WriteLine(csi.ToString());
return(csi);
}
}
}