| --- Log opened Sun Nov 14 00:00:42 2010 |
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| 00:18 | | mode/#code [+o Attilla] by Reiver |
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| 01:57 | < NSJavaGuest-9752> | Hello, |
| 01:58 | < NSJavaGuest-9752> | Anyone there? |
| 01:58 | <@Derakon> | No. |
| 01:58 | < NSJavaGuest-9752> | Oh hey Derakon |
| 01:59 | | NSJavaGuest-9752 is now known as Chicken |
| 01:59 | < Chicken> | :) |
| 01:59 | < Chicken> | It's quiet, anyone wanna chat. |
| 02:00 | < Chicken> | you dont love me D: |
| 02:00 | | Chicken [nsJChat@Nightstar-2d1aa47d.pa.comcast.net] has quit [[NS] Quit: Nightstar's Java Chat http://www.nightstar.net] |
| 02:00 | <@Derakon> | Dang kids and their need for instant gratification |
| 02:00 | <@Derakon> | And, for that matter, random chat in a purpose-built channel~ |
| 02:02 | < celticminstrel> | ... |
| 02:07 | | gnolam [lenin@Nightstar-38637aa0.priv.bahnhof.se] has quit [[NS] Quit: Z?] |
| 02:10 | <@Derakon> | "All this mess will hopefully go away pretty soon when we move to C99 types. It's a shame, I like Angband header files being fun little logic puzzles..." |
| 02:10 | <@Derakon> | From a thread discussing the following lines of C: |
| 02:10 | <@Derakon> | #undef bool |
| 02:10 | <@Derakon> | #define bool bool_hack |
| 02:10 | <@Derakon> | typedef char bool; |
| 02:12 | < celticminstrel> | ...what on earth is that for? |
| 02:12 | <@Derakon> | At a guess, to deal with different interpretations of the keyword "bool" on different compilers? |
| 02:13 | <@Derakon> | Especially e.g. to keep savefiles of the same size. |
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| 03:44 | | * Derakon eyes http://www.youtube.com/watch?v=NszGurDUlHc&feature=player_embedded and can see Reiver's point. |
| 03:44 | <@Derakon> | Mischan. |
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| 04:40 | < kaura> | Avast! |
| 04:41 | <@Vornicus> | Howdy. |
| 04:43 | <@Vornicus> | I have completely forgotten where we were. |
| 04:46 | < kaura> | I have too. Lemme look at my notes. |
| 04:48 | <@Vornicus> | I recall we had lexed the string into tokens, and that we had written our operator precedence dictionary, but beyond that... |
| 04:50 | < kaura> | Yes, something like that. Now I just need to recall the filename~ |
| 04:51 | < kaura> | Oh, right, Pycalc! |
| 04:52 | <@Vornicus> | Pretty sure we were starting work on the actual thing that figures out what it means, which means we had a paste about what to do in each situation. |
| 04:53 | < kaura> | I'd pastebin what we had so far, but pastebin apparently hates me right now. |
| 04:55 | <@Vornicus> | Not just you. And it looks like my rules paste has gone the way of the dodo, so I have to find it again. |
| 04:57 | < kaura> | Here we go. http://pastebin.starforge.co.uk/438 |
| 04:59 | <@Vornicus> | Ah, perfect. |
| 05:00 | <@Vornicus> | All right, so. We want to actually write evaluate now. |
| 05:00 | < kaura> | ...damn, I think I took too long a break. |
| 05:00 | <@Vornicus> | Probably. |
| 05:01 | <@Vornicus> | So let's look over what we've already written, first, and see if we can figure out what it's doing. |
| 05:02 | <@Vornicus> | I guess a good place to start is "rollone" - what's it do? |
| 05:05 | < kaura> | Returns an integer based off a number we set that represents the number of faces on the die. |
| 05:06 | <@Vornicus> | All right, and roll? |
| 05:07 | < kaura> | Hm. Returns the sum of a set of randomized outputs, all with the same number of "sides." |
| 05:08 | <@Vornicus> | Good. Okay, and lex? |
| 05:08 | <@Vornicus> | (one line at a time.) |
| 05:12 | < kaura> | Lesse. Strips the whitespace out of an input, dumping the result into "symbols"... |
| 05:12 | < kaura> | Does a search against the regex string. |
| 05:13 | < kaura> | If found, it appends to... ...actually, yeah, don't quite remember this part. |
| 05:14 | <@Vornicus> | ok, let's look at it for a moment. Actually i see a couple errors in here. Ones that, were we able to run the code, we'd notice immediately. |
| 05:16 | <@Vornicus> | 61: expr = self.expr_string.lstrip(), instead of what's there. This prevents you from stomping on self (which is the original object's name), and gets the thing we're actually dealing with to be local. |
| 05:17 | <@Vornicus> | What it /does/ is it takes self.expr_string, chops off any starting whitespace, and assigns it to expr. |
| 05:17 | <@Vornicus> | (now we also have to change most references to "self" in here to "expr" |
| 05:17 | <@Vornicus> | 62... makes an empty list that we're calling "symbols" |
| 05:19 | <@Vornicus> | 63: replace "self" with "expr" again; loop until we're out of expression to deal with. |
| 05:19 | <@Vornicus> | 64: run a regex match. |
| 05:20 | <@Vornicus> | This assigns the match object to "match". |
| 05:20 | <@Vornicus> | (again replace self with expr on 64. Also in 68, both times. Indent 69 one level) |
| 05:21 | <@Vornicus> | So far so good. What's 65 do? |
| 05:21 | < kaura> | If it isn't found in the regex, it tosses up an error flag. |
| 05:22 | <@Vornicus> | Good good. Okay, 67? |
| 05:24 | < kaura> | yeah, I forgot what x.group() does. |
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| 05:25 | < kaura> | It looks as if it takes everything stripped out and appends it to Symbols |
| 05:26 | <@Vornicus> | It takes the thing it found and appends it to symbols; |
| 05:26 | <@Vornicus> | 68 on the other hand manipulates expr. What's it do? |
| 05:28 | < kaura> | You know, that's about where I really got stumped. I think match.end() checks from the end of the list, but I don't know why there's a colon there. |
| 05:28 | <@Vornicus> | match.end() actually returns the index in the string of the last character of the match. |
| 05:29 | <@Vornicus> | and it's in an array slicing. Do yourself a favor, try "abcde"[2:] in the terp. |
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| 05:31 | < kaura> | ...bwah, syntax error. |
| 05:31 | < kaura> | Over a colon in U_DICT. Bwah? |
| 05:31 | < kaura> | Oh, nm. |
| 05:31 | <@Vornicus> | Put commas after each value. "+": "u+", |
| 05:31 | < kaura> | Yeah, saw that. |
| 05:32 | <@Vornicus> | (that one occasionally sneaks up on me, too.) |
| 05:34 | < kaura> | Ahhh, I see now. |
| 05:35 | <@Vornicus> | What we're actually doing here is removing the symbol we found from expr, so that naxt time through... |
| 05:36 | | * Vornicus thinks kaura can figure out what happens next time through. |
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| 05:39 | < kaura> | Right, the next part was to basically cycle through the expressions, removing them as it processes them, right? ...or something like that? |
| 05:40 | <@Vornicus> | Right. Okay, and 69. |
| 05:40 | <@Vornicus> | (and, actually, through the symbols.) |
| 05:50 | < kaura> | Right, 69... defines self.symbols as the... tuple, right? ...why are we doing that again? |
| 05:51 | <@Vornicus> | Self.symbols exists outside the function; symbols itself does not. |
| 05:53 | < kaura> | Ahh. |
| 05:58 | <@Vornicus> | And that's that. What we have, after lex is called, is an object with both expr_string and symbols on it. Now, we can move on to evaluate. |
| 06:03 | <@Vornicus> | So far what we've done in evaluate is set stuff up. |
| 06:05 | <@Vornicus> | Now, we have to take that stuff in the text (78-end) and turn it into code. This is a lot of stuff to do in one function, but you can if you want; I've actually separated it out into four functions. |
| 06:08 | <@Vornicus> | (specifically: one that handles the beginning and end and dispatches stuff to the operator- and number-mode functions, the operator- and number-mode functions themselves, and the thing that actually does the evaluation.) |
| 06:10 | <@Vornicus> | (which I actually do entirely separately from the reading off of symbols.) |
| 06:24 | <@Derakon> | ...why is top using 25% of my CPU? |
| 06:24 | <@Derakon> | It shouldn't need anywhere near that much. |
| 06:25 | <@McMartin> | If there's a shit-ton of processes it keeps interrogating them all |
| 06:25 | <@Derakon> | ps -efwww | wc -l |
| 06:25 | <@Derakon> | 81 |
| 06:33 | <@Vornicus> | (my four functions are called, in that order: postfixize, pfi_number, pfi_operator, and eval_postfix) |
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| 14:25 | | mode/#code [+o Attilla] by Reiver |
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| --- Log closed Mon Nov 15 00:00:43 2010 |