[Lazarus] [TIP] Run only one copy of the application (Linux/Windows)

silvioprog silvioprog at gmail.com
Wed Sep 8 23:51:34 CEST 2010

On 07/09/2010 18:20, Vincent Snijders wrote:
> 2010/9/7 Lukasz Sokol <el.es.cr at gmail.com>:
>> Hi Group,
>> How should the TStringList behave when
>> Delimiter := ' ';
>> QuoteChar := '"';
>> ?
>> On my
>> Lazarus r22279 FPC 2.2.4 i386-win32-win32/win64
>> when reading a line like this
>> Sep  3 16:27:32 router_ip src="internal IP:46987" dst="external_ip:64880" msg="Traffic Log" note="Traffic Log" devID="0019CBDF94A3" cat="Traffic Log" duration=300 send=168 rcvd=48 dir="LAN:WAN" protoID=17 proto="others" trans="Normal"
>> {the above should be one line}
>> I will obviously get the date split in 3 different Strings[],
>> !but! it also splits the 'msg="Traffic' and 'Log"' - is this correct ?
> Maybe StrictDelimiter is true?
> http://www.freepascal.org/docs-html/rtl/classes/tstrings.strictdelimiter.html
> Vincent
No, after forcing it to false, it still behaves the same (splits 'msg="Traffic' and 'Log"').

I know this is possibly a corner case, when Delimiter = ' ';  but there seems something
wrong with the logic in SetDelimitedText... ? (stringl.inc)
It fails on things like 'msg="Traffic Log"'... because it does not understand that a string
can be composed of plain and quoted part and should then be treated as one:

	// next string is not quoted
       while (j<=length(AValue)) and
             (Ord(AValue[j])>Ord(' ')) and
             (AValue[j]<>FDelimiter) do inc(j);
       Add( Copy(AValue,i,j-i));

maybe could become

  while (j<=length(AValue)) do
      // we might find QuoteChar in string that begins unquoted
      if (AValue[j]<>FDelimiter) then inc(j) 
      if (AValue[j]=FQuoteChar) then 
            inc(j);	// carry on until you find another quote, regardless of what is quoted
	  until (AValue[j]=FQuoteChar) or (j=length(AValue));
      // do we really have to have a special case for ' ' ? for backward compatibility maybe
      // but then be it lower priority than quotechar and delimiter
      if (Ord(AValue[j])>Ord(' ')) then inc(j) 
	else break;

This should be enough to support 'name="some value"' separated by spaces... and also
"some name"="some value" too... - comments ?

(the if...then...else...if maybe isn't optimal, but shows the idea)


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