public string NextToken(PortsTokenizeRequest request)
{
while (HasNext(request))
{
switch (request.TrimmedStatement[request.StringPosition])
{
case TabChar:
case SpaceChar:
case CommaChar:
case DotChar:
// Just skip these chars.
request.StringPosition++;
break;
default:
{
request.InEscape = false;
request.StartPos = request.StringPosition;
request.EscapePos = request.StringPosition;
if (request.PortDone || request.IsPortList)
{
if (request.TrimmedStatement[request.StringPosition] == LeftRoundBracketChar)
{
// Wire / port name starts after this bracket.
request.StringPosition++;
// Skip leading spaces (if any).
while (HasNext(request) && request.TrimmedStatement[request.StringPosition] == ' ')
{
request.StringPosition++;
}
request.EscapePos = request.StringPosition;
request.StartPos = request.StringPosition;
}
else
{
if (!request.IsPortList)
{
// Skip all chars before the wire name bracket.
request.StringPosition++;
continue;
}
}
// Parse loop for the wire / port name.
request.InBus = false;
while (HasNext(request))
{
if (request.InEscape)
{
if (request.TrimmedStatement[request.StringPosition] == SpaceChar)
{
request.InEscape = false;
request.StringPosition++;
}
else
{
request.StringPosition++;
}
}
else if (request.InBus)
{
switch (request.TrimmedStatement[request.StringPosition])
{
case BackslashChar:
// Must be the first char to be legal.
if (request.EscapePos == request.StringPosition)
{
request.InEscape = true;
}
break;
case RightCurlyBracketChar:
request.InBus = false;
break;
case CommaChar:
case SpaceChar:
// Escape is legal after these chars.
request.EscapePos = request.StringPosition + 1;
break;
}
request.StringPosition++;
}
else
{
switch (request.TrimmedStatement[request.StringPosition])
{
case BackslashChar:
// Must be the first char to be legal.
if (request.StringPosition == request.EscapePos)
{
request.InEscape = true;
}
request.StringPosition++;
break;
case RightRoundBracketChar:
request.PortDone = false;
request.StringPosition++;
return(request.TrimmedStatement.Substring(request.StartPos, request.StringPosition - 1 - request.StartPos).Trim());
case CommaChar:
request.StringPosition++;
if (request.IsPortList)
{
return(request.TrimmedStatement.Substring(request.StartPos, request.StringPosition - 1 - request.StartPos).Trim());
}
break;
case LeftCurlyBracketChar:
request.InBus = true;
request.StringPosition++;
break;
default:
request.StringPosition++;
break;
}
}
}
}
else
{
request.EscapePos = request.StringPosition;
// Parse loop for the port name.
while (HasNext(request))
{
// Exit if port was done.
if (request.PortDone)
{
break;
}
if (request.InEscape)
{
if (request.TrimmedStatement[request.StringPosition] == SpaceChar)
{
request.InEscape = false;
request.PortDone = true;
return(request.TrimmedStatement.Substring(request.StartPos, request.StringPosition - request.StartPos).Trim());
}
request.StringPosition++;
}
else
{
switch (request.TrimmedStatement[request.StringPosition])
{
case BackslashChar:
// Must be the first char to be legal.
if (request.StringPosition == request.EscapePos)
{
request.InEscape = true;
}
request.StringPosition++;
break;
case SpaceChar:
case LeftRoundBracketChar:
request.PortDone = true;
return(request.TrimmedStatement.Substring(request.StartPos, request.StringPosition - request.StartPos).Trim());
default:
request.StringPosition++;
break;
}
}
}
}
}
break;
}
}
if (!request.IsPortList)
{
return(null);
}
if (request.StringPosition <= request.StartPos)
{
return(null);
}
return(request.TrimmedStatement.Substring(request.StartPos, request.StringPosition - request.StartPos).Trim());
}
public bool HasNext(PortsTokenizeRequest request)
{
return(request.StringPosition < request.MaxLen);
}
