World: r3wp
[Core] Discuss core issues
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Gregg 25-May-2007 [8211] | http://www.rebol.org/cgi-bin/cgiwrap/rebol/view-script.r?script=like.r |
BrianH 25-May-2007 [8212x3] | The reason that regex compilers for REBOL are rare is that parse is more powerful than regex, and most people who start trying to implement regex usually learn enough about parse during the course of doing so that they switch to using parse instead :) |
Still, if you want help, a tester or a second opinion, post your code on the Parse group and we will optimize it for you. | |
It's funny, there's no better optimizer than the members of this world trying to show off and one-up each other :) | |
Gregg 25-May-2007 [8215] | I love this community. One of my favorite things is the ML threads that optimize code and bring out different perspectives on design. |
Terry 1-Jun-2007 [8216] | Hey... what's the code to prevent the security from popping up in windows? added -s to a shortcut, but not working? |
Gabriele 1-Jun-2007 [8217] | -s should work... |
Maxim 1-Jun-2007 [8218x8] | in 98% of cases I agree with what Brian just said about Parse being more powerfull than Regexp. but in those 2% regexp is SO much more powerfull, that it still has its place. now some of you will ask me to say when or why, (I know how we as rebolers think and like to challenge each other ;-) but I cannot give an exact example, but having had to implement a few complex systems in both, I remember a few times in parse when I'd remember how a single char would replace 2-3 lines of parse "tricks". |
so, having a regexp WITHIN parse would be oh so incredible. especially since Parse allows such an easy way to traverse data at such a fast rate. having regexp to take "decisions" would scale pretty nicely. OTOH having rebol to take decision could be an alternative too. | |
Parse is good at matching, but sometimes, a simple condition "means" something which is hellish to implement as a set of explicitely mutually-excluding matches. regexp is a little easier in this case (note I use easier not in style or readability here... just in raw expressiveness). | |
if we could add a conditional within the dialect of parse directly (without using tricks, which I know many will be tempted to demonstrate, and many which I already know about) then parse itself would have another level of expressiveness IMHO. | |
one example could be to use the return value of evaluated parens as a "matched? or not" in order to continue in a parse rule. | |
this would allow us to make much simpler rules sometimes, especially when such decisions are not based on simple left to right loading of values, but sometimes based on interdependent values, which only take meaning once certain patterns have been loaded. | |
for example, not only the type and shape of data, but its actual value? have I loaded enough of this, for this rule to qualify. is a specific attribute set to a mandatory value? there are many such examples. | |
again, I know most patterns CAN be described using parse, but in many occasions, what could have been a simple parens with a decision and 2 or 3 very simple rules, ended up being a complex tree of tens or more rules, which have non obvious interdenpendencies and things like left entry recursions (I hope I make sense here) which are, well, slow(er) and hard to map in one's mind. | |
Terry 1-Jun-2007 [8226] | regexp should be shot |
Chris 2-Jun-2007 [8227] | Max, could you flesh that out as a hypothetical example? |
Maxim 2-Jun-2007 [8228] | are you asking me to give an example? |
Chris 2-Jun-2007 [8229] | Sure, how would it look? |
Maxim 2-Jun-2007 [8230x2] | well, I guess the best way would be to use parens within the parse block as a means to return if we should continue in this rule, (and maybe even based on type, how many items to skip!). |
hum... you are asking my mind to shift from cgi and web site writing to parse rule generation.. hehe I'm a bit deep in the construction of Revault right now... with about 10 files opened and mapped in my mind ;-) | |
Chris 2-Jun-2007 [8232] | Fair enough -- just curious... |
BrianH 2-Jun-2007 [8233x2] | What Maxim is describing is the CHECK clause proposal I made a few years ago. See here: http://www.colellachiara.com/soft/Misc/parse-rep.html |
This collection was made last year, but I first proposed CHECK years ago (calling it IF at the time), for the previous round of proposals. | |
Henrik 5-Jun-2007 [8235x2] | I'm working on reducing memory consumption on my little database and was wondering if stats is reading out the total memory usage correctly or if Windows XP's job list is. I can do a script that gradually eats up 100 MB memory and then the memory is recycled, when I ask for it. 'stats then prints about 15 MB used, which is fine, but the job list reads out about 100 MB still used and it stays there. Right now it reads about 104.656 KB used, while stats prints 15588191 bytes. This is in a stopped console. Recycling more doesn't help. I've even seen the job list memory jump up 10-20 MB once when recycling. Which one is reading out the correct number? |
I think I get it. If I run the script again, the job list does not show memory usage to be above 104 MB until stats also show above 104 MB. So Windows must be keeping inactive memory around for the task. | |
Chris 5-Jun-2007 [8237] | I've made a small change to the %filtered-import.r script -- it should now properly handle the 'opt modifier: >> import [][test: opt string!] == [test none] >> import [test ""][test: opt string!] == [test none] >> import [test ""][test: string!] == none This last one could be considered unexpected? |
Louis 6-Jun-2007 [8238x2] | I'm trying to learn how to make tcp servers, reading this rebol doc: file:///C:/SDK/docs/core23/rebolcore-13.html#section-14 Why am I getting this error: >> listen: open tcp://:8001 ** Access Error: Error opening socket listen port ** Near: listen: open tcp://:8001 Turning the firewall off does not help. |
This seems to work: >> listen: open tcp://localhost:8001 But the docs specifically say: Notice that you do not supply a host name, only a port number. This type of port is called a listen port. The system now accepts connections on port number 8001. Is this a mistake in the docs? | |
Sunanda 6-Jun-2007 [8240] | Henrik -- I think Gabriele said recently that REBOL *never* hands back memory to the opsys. So, although, REBOL's stats are reporting in-use memory, they are not telling you all the still reserved memory. I think that explains your observations. |
sqlab 6-Jun-2007 [8241x2] | Lous: your port is already opened either by an opther application or by this rebol instance as you can connect to. So either use an other port number or close your listen socket before opening again |
sorry Lous --> Louis | |
Henrik 6-Jun-2007 [8243] | sunanda, I see, thanks |
Will 6-Jun-2007 [8244x2] | anyone else thinks this would be useful? reduce 'abc/'def/(1 + 2) instead of to path! reduce ['abc 'def (1 + 2)] |
but you can't do abc/'def/(1 + 2) so maybe a new repath function: repath abc/'def/(1 + 2) ? | |
Louis 6-Jun-2007 [8246] | sqlab, thanks. But no matter what number I use it is not working for me. |
Anton 6-Jun-2007 [8247] | Will, I think so. |
Oldes 6-Jun-2007 [8248] | Louis: if you: open tcp://localhost:8001 you do not open port for listening but for reading/writing as for example: p: open tcp://www.rebol.com:80 so if you can open such a port on localhost, you MUST have something what listens on such a port |
Anton 6-Jun-2007 [8249] | Oh yes, Oldes is right. Remove "localhost" if you want to be a server. The docs are right. Your next script, the rebol client that connects to this server, *will* specify localhost. |
Louis 6-Jun-2007 [8250] | Anton, Olds, sqlab, thanks for the help. Here I paste directly from the docs: >> server-port: open/lines tcp://:4321 ** Access Error: Error opening socket listen port ** Near: server-port: open/lines tcp://:4321 >> Could there be something wrong with the way XP is set up that is causing this? |
btiffin 6-Jun-2007 [8251x2] | Louis; Is something alreasy open on 4321...try another port... |
Never mind...just read back through the thread. Time for sleep. :) Good luck. | |
Will 6-Jun-2007 [8253] | Anton: you mean we need a repath function? |
Louis 6-Jun-2007 [8254] | btiffin and sqlab, it turns out that you both suggested the right thing. I must have a lot of ports being used already on my computer. Since you both thought this is what was wrong. I just kept on trying port numbers until finally...it worked! Thank you both very much! Thanks to all of you that helped me, this day has ended pretty good! Having endured the earlier aggravation, the good feels even better than usual. So many ports being open does make me wonder why, however. That seems a little dangerous to me. |
Ammon 6-Jun-2007 [8255] | Louis, here's a windows tool that will let you see what ports are open and what application is listening on the ports. http://www.nirsoft.net/utils/cports.html |
Oldes 6-Jun-2007 [8256] | or use this http://www.microsoft.com/technet/sysinternals/utilities/TcpView.mspx |
Louis 6-Jun-2007 [8257x2] | Ammon and Oldes, thanks. I'll check them out. |
87 ports open---most of them by REBOL. The script was working, but I didn't realize it because no window was opening. This was the result of working too many hours without enough sleep. It just doesn't pay. We get more done in the long run if we stop and play or sleep when we should. Thanks again, you guys, for all the help; very much appreciated! | |
Gregg 6-Jun-2007 [8259] | Will, a REPATH, AS-PATH, or DO-AS-PATH kind of thing would be very handy at times. |
Louis 6-Jun-2007 [8260] | Does the following line only work with e-mail? system/options/binary-base: 64 ; best binary encoding |
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