| --- Log opened Sat Nov 20 00:00:16 2010 |
| 00:28 | | kwsn [kwsn@Nightstar-ca9721ae.dyn.centurytel.net] has joined #code |
| 00:29 | | shade_of_cpux is now known as cpux |
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| 00:41 | < PinkFreud> | I read that as '... Harrison plotting ... Ford ... unavailable' |
| 00:44 | < Alek> | hehe |
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| 05:47 | <@McMartin> | "Truly it is said that the hacker whom the Gods would make mad, they first inspire to add one more layer of abstraction. Just one more. Then it'll be perfect." |
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| 06:13 | <@jerith> | Abstractions leak. |
| 06:43 | < Stalker> | Good morning again Mr. Jerith? |
| 06:44 | <@jerith> | It *is* a good morning, actually. :-) |
| 06:44 | | * jerith snugs his Young Lady. |
| 06:44 | | * Stalker will be going home from work now. |
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| 09:32 | < simon_> | is it the case that look-aheads and look-behinds extend the set of regular languages? |
| 09:32 | < simon_> | or are they just syntax sugar to reduce the size of certain regular expressions? |
| 09:34 | <@jerith> | They're extensions. |
| 09:36 | < simon_> | that means there is a regex using look-aheads that can't be expressed without look-aheads |
| 09:36 | < simon_> | I wonder how to construct such an example. |
| 09:36 | <@jerith> | Lookaheads don't match. |
| 09:37 | < simon_> | you mean they don't eat characters? |
| 09:37 | <@jerith> | I'm actually thinking more of negative lookaheads and such. |
| 09:37 | <@jerith> | Yeah. That's why they're lookaheads (or lookbehinds) rather than just matches. |
| 09:37 | < simon_> | are you saying that look-arounds and negative look-arounds extend regexes differently? |
| 09:38 | < simon_> | because zero-width assertions do match. |
| 09:38 | <@jerith> | Hrm. |
| 09:38 | <@jerith> | I think I'm out of my depth here. |
| 09:38 | <@jerith> | It's been a while since I looked at regexen in any detail. |
| 09:38 | < simon_> | yeah, I'm mostly interested in an example of negative look-arounds that can't be expressed without them. |
| 09:39 | < simon_> | it's funny to try and make mathematical statements about something I'd otherwise consider a hackish tool. well, that's university. :) |
| 09:39 | <@jerith> | I'm pretty sure they're implemented more efficiently than the syntactic-sugar alternatives if there are any. |
| 09:40 | <@jerith> | Regex is a language, and therefore mathematical statements make sense. |
| 09:44 | | gnolam [lenin@Nightstar-38637aa0.priv.bahnhof.se] has joined #code |
| 09:45 | < simon_> | well, if you were to do ^(?!abc).{5}$, I could do that using ^([^a]..|.[^b].|..[^c]|a[^b].|a.[^c]|etc)$, so that's just syntax sugar to prevent a blow-up in regex size. |
| 09:45 | < simon_> | hey gnolam |
| 09:45 | < simon_> | sorry, .{3} |
| 09:46 | < simon_> | gnolam, do you know if negative look-aheads is just syntax sugar, or if they extend the set of regular languages? |
| 09:49 | < simon_> | well, here's something |
| 09:50 | < simon_> | it seems that to step from regular languages to context-free languages, recursion is necessary |
| 09:50 | < simon_> | and afaik, you can only obtain recursive statements in regexes using backreferences. |
| 09:51 | <@jerith> | They're *regular* expressions. |
| 09:51 | < simon_> | jerith, regexes with backreferences aren't regular :P |
| 09:53 | < simon_> | e.g. you couldn't express ([a-z])\1 without the backref. |
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| 15:20 | | mode/#code [+o Attilla] by Reiver |
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| --- Log closed Sat Nov 20 17:37:43 2010 |
| --- Log opened Sat Nov 20 17:38:33 2010 |
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| 19:12 | | * jerith sighs at the comment he got on http://bugs.python.org/issue10231 |
| 19:14 | < celticminstrel> | orsenthil? |
| 19:20 | <@jerith> | Yeah. Looks like he completely misunderstood the problem. |
| 19:24 | < celticminstrel> | Yeah. |
| 19:24 | < celticminstrel> | Though it also looks like you didn't make it clear at first. |
| 19:26 | <@jerith> | Perhaps. The code is pretty clear, though. |
| 19:43 | | * jerith updates the patch and waits for orsenthil to wake up again. |
| 20:08 | | cpux is now known as shade_of_cpux |
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| 23:30 | < celticminstrel> | Is there any way to tell my computer to not let applications change the resolution? |
| 23:33 | <@froztbyte> | I imagine there might be some windows policy to do that, if it's windows |
| 23:33 | < celticminstrel> | Mac. |
| 23:34 | <@froztbyte> | Unknown mapping detected, raising lack of knowledge exception. |
| 23:34 | < celticminstrel> | XD |
| 23:34 | <@froztbyte> | although I'd be prepared to bet that it's possible |
| 23:34 | < celticminstrel> | Well, if it is it's far from obvious, and my Googling has had no luck so far. |
| --- Log closed Sun Nov 21 00:00:21 2010 |