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| 06:39 |
user2_ |
i'm currently installing luanti and multicraft to an old phone to compare them side-by-side- i find it sad they profit of 15 years of unpaid development |
| 07:37 |
sfan5 |
luatic: I was thinking the engine could hardcode blank.png to be a blank texture in the code |
| 07:37 |
sfan5 |
also prevents someone from trying any funny business by modifying the file |
| 07:56 |
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celeron55 |
that hardcoding could easily increase the binary size more than 30 bytes though! |
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[MatrxMT] |
<Blockhead256> lol |
| 11:11 |
[MatrxMT] |
<Blockhead256> seriously I was surprised it's a real file and not just a marker to the graphics pipeline to ignore the texture |
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| 17:50 |
pgimeno |
@birdlover32767 the ambiguous syntax thing happens in Lua when the last line ends with an identifier IIRC. Ending the previous line with a semicolon should solve it. |
| 17:50 |
erle_off_ice |
javascript moment ;) |
| 17:51 |
pgimeno |
e.g. a file where a line says: "a = b" and the next line says "(x)()" triggers it |
| 17:53 |
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| 17:54 |
pgimeno |
that's because in Lua, a newline is just whitespace, so a = b (x)(y)() could be parsed either as a=b(x) followed by (y)() or as a=b followed by (x)(y)() |
| 17:55 |
erle_off_ice |
significant whitespace haters when you inform them other languages than python exist: ☹ |
| 18:01 |
* user2_ |
<- python programmer- |
| 18:17 |
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| 18:36 |
bgstack15 |
use "/me" |
| 18:36 |
* bgstack15 |
demonstrates how to use it |
| 18:43 |
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| 18:44 |
[MatrxMT] |
<birdlover32767> i was doing something like { |
| 18:44 |
[MatrxMT] |
<birdlover32767> ("label[0,1;formspec %s"):format(foo) |
| 18:44 |
[MatrxMT] |
<birdlover32767> "random", } |
| 18:47 |
Krock |
birdlover32767: fwiw, make sure that "foo" is formspec escape'd |
| 18:47 |
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| 18:48 |
[MatrxMT] |
<birdlover32767> it is except for cases like numbers or set values (think "image_%s.png") |
| 18:48 |
[MatrxMT] |
<birdlover32767> translations are also escaped |
| 19:22 |
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| 19:28 |
jonadab |
I tried to learn Python, but the documentation that the community pointed me to at the time, was terrible, and also I kept running into situations where something that ought to be a one-liner wouldn't even fit in one screen of code, which gave me bad Cobol flashbacks. |
| 19:29 |
jonadab |
This was years ago before Python was as popular as now, so I assume the documentation has improved ad interim. |
| 19:29 |
jonadab |
But I ended up concluding that learning Python would really be redundant, since I'm already fluent in Perl. |
| 19:29 |
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| 19:33 |
jonadab |
lua is neither my favorite, nor my least favorite, of the various functional languages I've worked in. |
| 19:41 |
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| 19:48 |
bgstack15 |
"functional language"... as in functional programming? Does Luanti use any of the functional programming within lua? |
| 19:49 |
[MatrxMT] |
<birdlover32767> i mean functions are first class |
| 19:57 |
bgstack15 |
Ah, I think we just call that imperative programming. |
| 20:00 |
luatic |
pgimeno: the necessary criterion i'd give is that the *next* line is a function call, with the function being an expression wrapped in parenthesis, so something like (expr)(...). |
| 20:03 |
pgimeno |
anything with an expression in parentheses would do as the second line I presume, not necessarily a function call, for example this triggers it as well: a = b \n (x).c = 2 |
| 20:03 |
luatic |
there are a few different options for what the previous line can be as long as it ends with something that could be taken to be a prefixexp. for example local x = t.k (expr)(...) is in principle ambiguous, as is f() (expr)(...) or f"..." (expr)(...). |
| 20:03 |
luatic |
pgimeno: fair point, though that is not ambiguous? i think the "ambiguity check" lua implements might just be lazy. |
| 20:04 |
luatic |
it's more of a "can i conveniently parse this left to right with little lookahead" check i suppose. |
| 20:04 |
pgimeno |
PUC Lua seems to not care, it's LuaJIT the one complaining FWIW |
| 20:05 |
pgimeno |
you're right that a = b(x).c = 2 is not valid, therefore it can only split after the b, so it's not actually ambiguous, but a recursive descendent parser is very limited, and that's probably what's being used |
| 20:05 |
luatic |
yes |
| 20:06 |
luatic |
though actually i think if you put in some work you could also do this using a recursive descent parser, but some implications e.g. for worst case time complexity might not be nice |
| 20:07 |
pgimeno |
it might need backtracking perhaps |
| 20:07 |
luatic |
yes |
| 20:07 |
luatic |
pgimeno: might be misremembering here because i run into it very rarely, maybe once per 10 kloc, but i think it was specific puc lua versions that complained? |
| 20:07 |
pgimeno |
yes I seem to remembre that as well |
| 20:07 |
luatic |
i think newer lua versions and luajit just pretend the newline is a semicolon if they encounter this "ambiguity" |
| 20:08 |
pgimeno |
oh wait, I was trying with 5.2, my bad |
| 20:08 |
pgimeno |
yeah, 5.1 complains just the same as LuaJIT |
| 20:09 |
luatic |
huh, how is your luajit configured? with or without 5.2 compat? |
| 20:09 |
pgimeno |
with 5.2 compat, but I don't think that influences the parsing |
| 20:10 |
pgimeno |
but my system's lua runs 5.2 |
| 20:11 |
luatic |
actually i think i just got it the wrong way around, f() \n (g)() is parsed as f()(g)() by my luajit it seems |
| 20:11 |
luatic |
but it does not produce a parse error |
| 20:12 |
pgimeno |
yes, it probably stops considering it a function at the newline |
| 20:13 |
pgimeno |
oh for me it does error |
| 20:13 |
luatic |
no no, that seems to be the funny thing, it considers it a single function call |
| 20:13 |
luatic |
pgimeno: looking at the source, luajit will only produce LJ_ERR_XAMBIG #if !LJ_52 |
| 20:14 |
luatic |
and that seems to be enabled iff LUAJIT_ENABLE_LUA52COMPAT is defined basically (: |
| 20:14 |
pgimeno |
ah, with 2.1.1716656478 it doesn't complain indeed |
| 20:15 |
pgimeno |
my system's default luajit is 2.0.4 |
| 20:16 |
luatic |
whoa, older than 2.1? |
| 20:19 |
pgimeno |
(er... don't ask) |
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