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<Onemorenickname>
"matched_string s returns the substring of s that was matched by the last call to one of the following matching or searching functions:"
<Onemorenickname>
really... ?
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<Onemorenickname>
Is there a more functional standard library for regex ? (which do not rely heavily on exceptions and states ?)
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<jg_>
hi all. so i created a custom toplevel with 'ocamlmktop'. Can i somehow load it with utop?
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<Enjolras>
Onemorenickname: there are tons of re libs. ocaml-pcre, binding to pcre, ocaml-re2, bindings to google re2, and ocaml-re, pure ocaml implementation
<Enjolras>
non of them are particularly functionnals, but at least they are not totally statueful like Str
<Enjolras>
you can easily keep your current state, create a utop.ml with let () = UTop_main.main () and redo you mktop command adding this file
<Onemorenickname>
Enjolras, if performance is not an issue (it's only for the tokenizer of a language), which one is the best ?
<Enjolras>
Onemorenickname: if performance is not an issue, i would say ocaml-re. If it is, re2. If you want full "power" of regexp with backrefs etc, pcre
<Onemorenickname>
Enjolras, ok, ocaml-re it is then. Thank you :)
<sgronblo>
is there no ocaml library that gives aeson-style parser combinators?
<Enjolras>
i'm not sure what is aeson style, but check angstrom for parsers combinators
<jg_>
Enjolras: thanks!
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<sgronblo>
Enjolras: something to make it easier to parse from the generic json value type to ocaml types such as variants
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<ggole>
Ocamlbuild doesn't pass cflags to ocamlmktop. It doesn't have a flags argument for this, either.
<ggole>
Is there some way to pass flags that I'm missing, or do I have to do the plumbing myself?
<Drup>
Enjolras: ocaml-re is efficient
<Drup>
not sure why "if performance is not an issue" ...
<companion_cube>
is it as efficient as re2, really?
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<Drup>
not sure about re2, but compared to all the rest, it's a no brainer
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<Drup>
(and ocaml's re2 bindings come with some strings attached ...)
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<companion_cube>
compared to pcre, really?
<Drup>
pcre is horribly slow
<companion_cube>
I'm surprised, I thought it was only when it did a lot of backtracking
<companion_cube>
(anyway the biggest issue with ocaml-re is not perf, it's unicode)
<Enjolras>
Drup: it's much much more efficient than pcre. PCRE is awfully slow
<Enjolras>
Drup: but re2 is one step ahead
<Enjolras>
companion_cube: pcre is terribly slow because it allocates A LOT
<Enjolras>
not sure why
<Drup>
well, that, and the algorithm is kinda crap
<Enjolras>
re2 comes with some usability cost though
<Enjolras>
for instance, since building the dfa is lazy, there are several classes of errors which will be raised lazily at match time
<Enjolras>
and worse than that, some error will raise depending on the input
<Drup>
Enjolras: that's .. weird
<Enjolras>
mainly the "out of memory" error limiting the size of the dfa
<Enjolras>
but there is another kind of error which can fire on similar occasions
<Enjolras>
still, it's fast.
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<Drup>
(I really like re's api too, but that's another discussion)
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<Enjolras>
that was my point. Use ocaml-re, it's better, unless you need really really high performance
<Drup>
Enjolras: do you have benchmarks comparison for re2 vs re ? I would really like to see the numbers :p
<Enjolras>
Drup: i have some specific benchmarks for some specific workload yes
<companion_cube>
Enjolras: oh ok, interesting
<Enjolras>
i reduced cpu usage of some heavy user of regex from 50%cpu per process to 15% cpu per process by switching
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<Enjolras>
and i've benched a few specific regexp where re2 was between 10 and 20% faster
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<Drup>
10 to 20% ? That's ... really ok
<Enjolras>
Drup: sure. I guess it depends on what you are doing :)
<Enjolras>
20% of a task which takes 7 days is more than a day
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<Drup>
sure :)
<adrien>
btw, pcre is getting a new JIT and whatnot
<adrien>
supposed to be much faster
<adrien>
(don't know how stable however)
<Enjolras>
i think pcre is useless in ocaml. It's only useful if you need well perl compatible regexp
<Enjolras>
at this point you should probably write a parser
<companion_cube>
(how fast is ocamllex, btw, compared to that?)
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<companion_cube>
(for the class of regex it supports)
<Enjolras>
no idea
<Drup>
ocamllex is really fast
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<Drup>
(no warmup time, no indirection since it generates the code directly, can be further optimized by the compiler ...)
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<Enjolras>
i'm actually starting to think that performance should never be discussed "generally"
<Enjolras>
it's always depends on some specific workloads and input etc
<Enjolras>
i should have refrain to comment.
<Drup>
Enjolras: well, you can still make some comparison
<Drup>
the thing is by how much
<Enjolras>
Like if you are trying to match on data you read from an HDD the perfomance of the regex engine does not matter at all
<Enjolras>
C++ users always talk about cache friendliness and stuff and i used to say "lol"
<adrien>
they tend to discover that not all access patterns for multidimensional arrays are the same also
<Enjolras>
but now for the first time of my life i have a programm with reaches the maximum memory bandwidth of the ram punctually and it would matter
<Enjolras>
still it does not mean lists are total crap for 99% of the programs
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<Drup>
Enjolras: generally, if it's by 10/20%, then ok, maybe it will depend, and maybe convenience trumps that... if it's 3 order of magnitude, just no.
<Enjolras>
like pcre/re :D
<Drup>
exactly.
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<gjaldon>
I'm trying to use Jane Street's fieldslib lib that comes with Core but I get a syntax error when I try to use `with`. I'm using it like: http://stackoverflow.com/a/6027659/1245024
<gjaldon>
Is there a change to how to use it since last 2013? I'm following the Real World Ocaml book
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<companion_cube>
Algebr: hey, you know why linenoise doesn't support ctrl-arrow?
<companion_cube>
(otherwise the lib is nice)
<Algebr>
don't know, haven't looked at it in a bit
<Algebr>
can ask on twitter
<companion_cube>
would be nice indeed
<Algebr>
k, asked, usually people reply
<companion_cube>
or maybe the one bundled with your lib is old?
<Algebr>
I haven't updated it in a bit so probably need to cut a new release anyway
<Algebr>
there's some things I wanted to clean up anyway
<companion_cube>
(not the API, I hope? ^^)
<Algebr>
no, I think there are mistakes in the C side
<Algebr>
API I think was fine
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<companion_cube>
ok cool
<Algebr>
why, have plans on using it?
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<companion_cube>
already the case
<companion_cube>
(in a personal project though)
<Algebr>
ah, k, so I won't touch the api
<Algebr>
I wanted to run address sanitizer on it, love addr sanitize
<companion_cube>
thanks
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<tobiasBora>
Hello,
<tobiasBora>
Does anyone knows how I could speak/read from an arduino device (which uses serial port) ?
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<etc>
Is there any way to link a library against itself? within "filename.ml": open Filename;;
<etc>
filename's a bad example because that's already a library, but I think it's clear
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<sgronblo>
so ocaml programmers tend to say that they dont need haskell style type definitions because they would put those in the .mli file right, but doesnt this then have the consequence that they will be exposed from the module by doing that? so if you wanna explicitly specify the type for an internal function you have to do it the kinda crappy way.
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<tobiasBora>
etc: Why would you want to do that ?
<oriba_>
tobiasBora: thats magic. You wrote, what I thought, just at the same moment! :-)
<tobiasBora>
sgronblo: Well, haskell has moreover class type, while ocaml hasn't. So Ocaml don't need has much type explicit :
<oriba_>
maybe this can be used one day ;-)
<tobiasBora>
a + b always meens in Ocaml that 'a' and 'b' are integers.
<tobiasBora>
In haskell it's not that trivial so it tries to use tricky ways to find the type... and usually it fails if you do not provide the type in the function parameters
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<tobiasBora>
what could be used ?
<oriba>
tobiasBora: just a joke about my telepathy that you write what I think ;-)
<oriba>
tobiasBora: I also wondered, why one should linka a library against itself
<tobiasBora>
sgronblo: And if you need to hidde type, I would say that you would use module to do so
<tobiasBora>
sgronblo: you build a general signature for the module, and after you create several "implementations".
<tobiasBora>
and using functors with modules make them still more powerfull
<tobiasBora>
(basiquely, a functor takes a module in argument, and gives back another module)
<tobiasBora>
And to conclude our game with type, you can play with objects, GADT... Lot's of fun !
<tobiasBora>
Btw, if I didn't answer to your question (which is possible since I'm not really the best man to talk about this), just ask !
<tobiasBora>
oriba: Yes, Quantum Teleportation is with us.