/// <summary>
/// Parse the list of attributes - separated by ';'s. Attributes always are in the
/// form 'id=value' and indicate key/value pairs in the iCalendar attribute format.
/// </summary>
/// <returns></returns>
protected virtual bool parseAttributes(Scanner scan)
{
Token key = scan.GetNextToken(ScannerState.ParseKey);
if (key == null || key.TokenVal == TokenValue.Error)
{
// some kind of error - skip rest of line and continue
if (key == null)
{
reportError(scanner, " expecting ID - found nothing.");
}
else
{
reportError(scanner, " expecting ID - found " + key.TokenText);
}
return(false);
}
Token sep = scan.GetNextToken(ScannerState.ParseSimple);
if (sep == null || sep.TokenVal == TokenValue.Error || sep.TokenVal != TokenValue.Equals)
{
// some kind of error - skip rest of line and continue
if (sep == null)
{
reportError(scanner, " expecting = - found nothing.");
}
else
{
reportError(scanner, " expecting = - found " + sep.TokenText);
}
return(false);
}
Token val = scan.GetNextToken(ScannerState.ParseParms);
if (val == null || val.TokenVal == TokenValue.Error)
{
// some kind of error - skip rest of line and continue
if (val == null)
{
reportError(scanner, " expecting parameter - found nothing.");
}
else
{
reportError(scanner, " expecting parameter - found " + val.TokenText);
}
return(false);
}
if (key.TokenVal == TokenValue.Tvalue && scanner == scan)
{
// it's an IPROP - don't ask...
iprop = val;
}
else
{
attributes.Push(new DictionaryEntry(key, val));
}
// do a recursive case to identify all of the attributes
sep = scan.GetNextToken(ScannerState.ParseSimple);
if (sep == null || sep.TokenVal == TokenValue.Error)
{
// if we are parsing an rrule - this is the line termination
if (scanner != scan)
{
return(true);
}
// some kind of error - skip rest of line and continue
if (sep == null)
{
reportError(scanner, " expecting : or ; - found nothing.");
}
else
{
reportError(scanner, " expecting : or ; - found " + sep.TokenText);
}
return(false);
}
if (sep.TokenVal == TokenValue.Colon)
{
// termination case
return(true);
}
else if (sep.TokenVal == TokenValue.SemiColon)
{
// recursive case
return(parseAttributes(scan));
}
return(true);
}
/// <summary>
/// Parse the list of attributes - separated by ';'s. Attributes always are in the
/// form 'id=value' and indicate key/value pairs in the iCalendar attribute format.
/// </summary>
/// <returns></returns>
protected virtual bool parseAttributes(Scanner scan)
{
Token key = scan.GetNextToken(ScannerState.ParseKey);
if (key == null || key.TokenVal == TokenValue.Error)
{
// some kind of error - skip rest of line and continue
if (key == null)
reportError(scanner, " expecting ID - found nothing.");
else
reportError(scanner, " expecting ID - found " + key.TokenText);
return false;
}
Token sep = scan.GetNextToken(ScannerState.ParseSimple);
if (sep == null || sep.TokenVal == TokenValue.Error || sep.TokenVal != TokenValue.Equals)
{
// some kind of error - skip rest of line and continue
if (sep == null)
reportError(scanner, " expecting = - found nothing.");
else
reportError(scanner, " expecting = - found " + sep.TokenText);
return false;
}
Token val = scan.GetNextToken(ScannerState.ParseParms);
if (val == null || val.TokenVal == TokenValue.Error)
{
// some kind of error - skip rest of line and continue
if (val == null)
reportError(scanner, " expecting parameter - found nothing.");
else
reportError(scanner, " expecting parameter - found " + val.TokenText);
return false;
}
if (key.TokenVal == TokenValue.Tvalue && scanner == scan)
{
// it's an IPROP - don't ask...
iprop = val;
}
else
{
attributes.Push(new DictionaryEntry(key, val));
}
// do a recursive case to identify all of the attributes
sep = scan.GetNextToken(ScannerState.ParseSimple);
if (sep == null || sep.TokenVal == TokenValue.Error)
{
// if we are parsing an rrule - this is the line termination
if (scanner != scan)
{
return true;
}
// some kind of error - skip rest of line and continue
if (sep == null)
reportError(scanner, " expecting : or ; - found nothing.");
else
reportError(scanner, " expecting : or ; - found " + sep.TokenText);
return false;
}
if (sep.TokenVal == TokenValue.Colon)
{
// termination case
return true;
}
else if (sep.TokenVal == TokenValue.SemiColon)
{
// recursive case
return parseAttributes(scan);
}
return true;
}
/// <summary>
/// Alternate entry point for starting the parser.
/// </summary>
/// <param name="emitHandT">Indicates if the emitter should be told to emit headers
/// and trailers before and after emitting the iCalendar body</param>
public void Parse(bool emitHandT)
{
buff = new StringBuilder();
stack = new Stack();
linenumber = 0;
attributes = new Stack(); // a stack of key-value pairs (implemented as a stack of DitionaryEntry)
if (emitHandT)
{
emitter.doIntro();
}
// each time through the loop will get a single (maybe folded) line
while (true)
{
// check for termination condition
if (scanner.isEOF())
{
// end of file - do cleanup and go
break;
}
// empty the attribute stack and the iprop value...
attributes.Clear();
iprop = null;
id = null;
//FIXME: linenumber doesn't really keep track of actual line numbers because
// it is not aware of folded lines...
linenumber++;
//DEBUG: emit line number
//emitter.emit( linenumber + ". " );
if (!parseID())
{
continue;
}
// we now have to parse a set of attributes (semi-colon separated) or
// a value (delimited by a colon)
Token sep = scanner.GetNextToken(ScannerState.ParseSimple);
if (sep == null || sep.TokenVal == TokenValue.Error)
{
// some kind of error - skip rest of line and continue
reportError(scanner, " expecting : or ; after id - found nothing.");
continue;
}
else if (sep.TokenVal == TokenValue.SemiColon)
{
if (!parseAttributes(scanner))
{
continue;
}
// now we have to parse the value
sep = scanner.GetNextToken(ScannerState.ParseSimple);
if (!parseValue())
{
continue;
}
}
else if (sep.TokenVal == TokenValue.Colon)
{
if (!parseValue())
{
continue;
}
}
else
{
reportError(scanner, "expecting : or ; after id - found: " + sep.TokenText);
continue;
}
// now sploosh out the attributes (if any) and finish the ID tag
while (attributes.Count > 0)
{
DictionaryEntry entry = (DictionaryEntry)attributes.Pop();
Token key = (Token)entry.Key;
Token val = (Token)entry.Value;
emitter.doAttribute(key, val);
}
emitter.doEnd(id);
}
if (emitHandT)
{
emitter.doOutro();
}
}
public bool MoveNext()
{
current = scanner.GetNextToken();
return(current != null);
}