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<Heasummn>
how do I pass in variables to menhir
<Heasummn>
I have an error handler that I want menhir to update
<Heasummn>
I'd like to do it functionally, by letting menhir take my error handler from the lexer, but I can use globals if that's required
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<ra4king>
fun times
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<ra4king>
I thought I was done with OCaml for my Programming Languages course but Assignment 2 involves it
<ra4king>
welcome back gang
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<flux>
:)
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<dario9>
I've come across an issue with Oasis. Basically I have an executable "exec" that has one module "foo_stubs.c" written in C.
<dario9>
I've added "CSources: foo_stubs.c" to the "Executable exec" section of my _oasis file.
<dario9>
However, upon compilation I get an undefined reference to "caml_foobar" error. "caml_foobar" is the name of the function declared in foo_stubs.c.
<dario9>
I've successfully used CSources with Oasis before, but always in the context of libraries, not executables.
<dario9>
Is this a known limitation of Oasis, or is there some special incantation I'm missing?
<Algebr>
maybe just make a small wrapper lib just for this c file, then add in BuildDepends of the exectuable
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<rgrinberg>
Is there a way to constrain an opam package to be available on ocaml switches with ocamlopt?
<rgrinberg>
I.e. the package isn't available on bytecode only systems
<Drup>
rgrinberg: the predicate "ocaml:native" is avaiable
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<rgrinberg>
Drup: so could I add something like & "%{ocaml-native}" to the available field??
<rgrinberg>
or just & {ocaml-native} actually
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<Drup>
I think
<Drup>
you should consult the manual :D
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<rgrinberg>
Well that didn't work :/
<Drup>
huum, I'm not sure
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<Drup>
AltGr ?
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<AltGr>
Have I been summoned ?
<Drup>
Yes you have :D
<companion_cube>
aantron: btw, re-read the thread on lwt-stream, still quite interesting ^^
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<Drup>
no change for 2.0 ?
<Drup>
(pure curiosity)
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<AltGr>
there is no easy way on 2.0 actually
<AltGr>
you can't define that variable globally since ocaml is now a package
<gjaldon>
hannes: ping! are you around?
<AltGr>
so package-variable `ocaml:native` is available, but you can't use it in the `available:` field
<Drup>
Algebr: do we need base-native ?
<AltGr>
yes, we would need something like that
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<Drup>
hum, not unreasable, at least it's consistent
<Drup>
unreasonable*
<Drup>
unreasonable
<Drup>
grmbl.
<AltGr>
everything in the `available:` field that is not tied to the system, outside of opam, should be encoded as `depends:` (therefore, as packages)
<hannes>
gjaldon: yes.. feel free to DM or in #mirage...
<gjaldon>
hannes: oops just realized this was #ocaml. ok will DM
<AltGr>
interestingly enough, we had no package with `available: ocaml-native`, so I was able to skip this issue.
<AltGr>
Now if rgrinberg is adding one to the repo, that'll choke my migration script... :/
<dario9>
Any Oasis gurus in the audience?
<companion_cube>
not particularly :3
<Algebr>
dario9: faster replies by asking in the oasis gitter
<rgrinberg>
AltGr: awww, that's too bad. Gerd is making a fix for this issue so the next point release of omake will be available on bytecode systems
<rgrinberg>
So if it's easy, you could just skip migrating this particular version of omake
<rgrinberg>
But it would be nice if 2.0 supported restricting to native only as well of course.
<Drup>
AltGr: maybe you should just add base-native (and base-dynlink, while we're at it)
<rgrinberg>
+1
<AltGr>
ok, cool. That's what the script should do actually, with a warning
<AltGr>
Drup, yes, that's the easiest fix
<Drup>
it seems consistent to how unix/thread/bigarrays are handled
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<AltGr>
but what is the rule to know if base-native is available or not ?
<AltGr>
There must be some OS/ocaml version based formula ?
<rgrinberg>
check if ocamlopt is in path?
<rgrinberg>
kinda like how the conf-* packages work
<AltGr>
nope, that's dynamic
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<AltGr>
it's possible, but this way, the solver would choose a solution requiring base-native, then the install would fail
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<Drup>
AltGr: how is the presence of base-unix and co decided ?
<rgrinberg>
What about reading ocaml/Makefile.config?
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<AltGr>
if we can find a static formula + dependencies to the actual OCaml package, the solver can handle it properly
<AltGr>
Drup: base-unix is always available, actually :S
<companion_cube>
would jsoo become a compiler-as-a-package at some point?
<Drup>
companion_cube: why ?
<AltGr>
but you could depend on a selected subset of the ocaml implementation packages
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<companion_cube>
because jsoo would not have base-unix ;)
<Drup>
companion_cube: actually, it could, there is a set of implementation for some specific use cases
<AltGr>
Until we have `provides:`, the easiest, although a little convoluted, is to have `base-foo` always available, then all compilers _not_ providing it indicate a conflict. This way, `base-foo` gets pulled by the solver when needed and if the compiler is compatible
<Drup>
AltGr: but isn't the presence of native (or threads ?) architecture dependent ?
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<Drup>
not sure if it should be really static ...
<AltGr>
that can be checked using predefined opam variables
<Drup>
hmmm
<AltGr>
yes, sorry, my definition of "dynamic" was a bit weird
<Drup>
what you mean by static is "before calling the solver", right ?
<AltGr>
yes
<Drup>
yeah
<AltGr>
actually, we currently have two species of `base-*` packages
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<Drup>
I don't really have a proposition, sorry. Maybe that should be discussed on the mailing list/bug tracker ?
<AltGr>
e.g. `base-unix` is determined from the compiler package (except in reality, it's always available, but let's assume the compiler `provides:` it)
<companion_cube>
Drup: meh, if you only provide a subset it's quite dangerous...
<AltGr>
and e.g. `base-ocamlbuild` belongs to the other family: the compiler has no knowledge of it, and it's determined by a formula `depends: "ocaml" {>= "3.10" & < "4.03"}`
<Drup>
I see
<AltGr>
(or `available:` in 1.2)
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<AltGr>
yep, feel free to open an issue or thread
<Drup>
well, the conclusion seems to be "we need provide to do it correctly"
<AltGr>
well, that isn't exactly the issue; we have workarounds for provides, they are just more verbose
<AltGr>
here, your ocaml packages would still have to specify "statically" wether the provide a native code compiler or not.
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<AltGr>
(hmm, maybe `provides:` as "just" a way of specifying dependencies in reverse is already useful...)
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<grayswandyr>
hi if anyone from the RWO authors is here: the RWO site is down
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<ocaml871>
Hello, how can I disable, or handle the resizing event using the Graphics module?
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<Drup>
ocaml871: graphics is very limited, not sure you can
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<ocaml871>
well, thanks for the tip, looking for an alternative
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<grayswandyr>
the ppx_deriving_morphism extension allows to generate mappers and folders for ADTs relying on open recursion (in the style of OCaml's Ast_mapper). However, it relies on records which makes its use a bit tedious. Another way to implement folders relies on classes and late binding (see e.g. RWO ch. Classes § Private methods). Anyone knows of a ppx implementing the way with classes?
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<MrMateus>
can someone help me with basic code? getting error
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<tane>
$paste
<tane>
hm
<tane>
wrong channel :) MrMateus what's your problem?
<MrMateus>
hey, do you mind if i show you the code in message?
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<Onemorenickname>
Hi people
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<reynir>
hi Onemorenickname
* reynir
wonders what the original nick was
<Onemorenickname>
I often pattern match |{a=x;position=_}, I was wondering if there was a way to do something like "let pattern x = {a=x;position=_} in match my_var with | pattern(x)", or something similar
<Onemorenickname>
reynir, it seems I've forgotten it myself
<reynir>
You can write a pattern »{ a=x; _ }« if you like. "Punning" the field name is also possible: »{ a; _ }«
<zozozo>
Onemorenickname: afaik, that's not possible
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<Onemorenickname>
reynir, actually, sometimes, i'd like to do patter2 x y = {a=x,position=y}
<Algebr>
could use `when`
<Onemorenickname>
zozozo, hm... So there is no way around long pattern matchings ?
<zozozo>
well, no, but as reynir said, you can do something like: match .. with { a; position; } -> ...
<zozozo>
which is actually fairly concise
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<lyxia>
|{a} -> ...
<Onemorenickname>
zozozo / reynir, and then, I can use a as a variable ?
<zozozo>
yup
<Onemorenickname>
oh, I haven't understood that from what he wrote
<flux>
onemorenickname, if you name your variables right, you can use the punning that direction as well: let patter2 a position = { a; position }
<zozozo>
flux: in that case, it's not a pattern, but a way to construct a value
<Onemorenickname>
Well, later, I have more than 1 level of pattern matching, like {a;position={fst;len}}, does it still work ?
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<flux>
zozozo, well yes, but it seemed he was interested in constructing as well
<zozozo>
sure, although, you'll probably need to use 'as' construct if you want access to the position field
<reynir>
as you wrote it yes, but I don't think 'position' will be bound
<reynir>
zozozo: you're reading my mind :-)
<zozozo>
Onemorenickname: btw, if you have records, you knwo you can simply do : v.a, v.position, v.position.fst, ... ?
<zozozo>
reynir: ^^
<lyxia>
You can also apply a function that extracts the relevant fields before pattern matching.
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<Onemorenickname>
yep, but it's what's inside the record that allows me to pattern match
<Onemorenickname>
One of the main reason I'm doing this in ocaml is because of deep pattern matching
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<Onemorenickname>
(actually, i don't know how it's called, but you get what i mean)
<flux>
onemorenickname, well you could write a function like: let tupleify { a; position } = (a, position) match List.map tupleify input with | (`Id_Token s, _) :: (`Block_Open_Token; pos) :: rest -> ..
<Onemorenickname>
hm
<flux>
(oops, the last ; should be ,)
<Onemorenickname>
I can transform my data, indeed
<Onemorenickname>
I guess that's what I'll do, as performance is not an issue
<Onemorenickname>
But, there is no better way to do this ?
<flux>
other than restructing the whole problem from explicit pattern matching to a rule machine, I don't think so..
<flux>
seems like you're doing something ocamlyacc does for you.
<Onemorenickname>
flux : ? Could you explain the part about ocamlyacc ?
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<flux>
you're parsing, ocamlyacc is a parser generator..
<Onemorenickname>
oh, you are talking about my code, i see
<Onemorenickname>
i thought you were talking about the problem
<Onemorenickname>
(well, i don't know how i can make ocamlyacc change the fixity of arbitrary operators)
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<flux>
arbitrary as in dynamically introduced?
<Onemorenickname>
flux : "dynamically" not as "runtime", but as scope + rules based
<Onemorenickname>
like, in a bloc, I can "open SomeOtherBloc", and I will get the operators from this bloc with their fixity
<flux>
sounds like something it wouldn't be able to do
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<Onemorenickname>
I don't know any parser generator able to do that ha ha :D
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<Bluddy[m]>
wasn't deep pattern matching proposed for the compiler?
<lyxia>
Onemorenickname: you could parse infix expressions in a flat list first, and resolve fixity at the same time you do names.
<Algebr>
wasn't there a way to use the private keyword such that it would let you see the record definition but you couldn't make one besides the use of a function
<zozozo>
Algebr: type t = private { foo: int} int the signature
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<Algebr>
hmm, I thought that was the case but then my function gets a complaint that I can't make it
<Algebr>
it has to be in a signature? can't be in a struct?
<zozozo>
that's because the "private" should only be in the signature, not the definition in the .ml
<Algebr>
i c
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<Onemorenickname>
lyxia : There are several other things done dynamically, but I haven't thought about such options for these too
<Onemorenickname>
Thank you !
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<Onemorenickname>
(by the way, does anyone know of a tutorial for ocamlbuild ?)
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<Onemorenickname>
(omg, I managed to make it work, it's my first time)
<Onemorenickname>
(this feels so good)
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<Bluddy[m]>
ocamlbuild is pretty easy to use
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<Algebr>
hmm, caml_alloc_array uses char* instead of void*
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<companion_cube>
hey rgrinberg, is hamt still maintained?
<companion_cube>
looks like it doesn't like the last version of oasis
<MrMateus>
hey guys anything wrong with this syntax? let sorted = List.sort (fun (_, i1, _) (_, i2, _) -> Pervasives.compare i1 i2) main_list;
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<companion_cube>
the `;` at the end
<companion_cube>
if it's a definition, don't add anything after main_list
<MrMateus>
still get compiling error ):
<companion_cube>
in the toplevel, add `;;` to tell ocaml to start parsing, is all
<MrMateus>
if i remove that line the code compiles and works
<MrMateus>
can it be any problem with the compiler?
<companion_cube>
probably not.
<MrMateus>
:/ any other idea why it doesnt work?
<companion_cube>
well, the ;
<companion_cube>
it's just wrong
<MrMateus>
without the ; it doenst work also
<companion_cube>
is it in another block of code?
<companion_cube>
are you running in the toplevel, or in a file?
<MrMateus>
file
<MrMateus>
in top level it works fine
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<companion_cube>
can you show the file's content (using a paste)?
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<MrMateus>
anyone around?
<pierpa>
no, nobody.
<MrMateus>
):
<pierpa>
just kidding!
<MrMateus>
can you give me some help with code? xD
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<pierpa>
probably not, but you ask your question, and someone will be able to
<MrMateus>
well
<ethnopes>
there's no point in asking to ask, just ask
<MrMateus>
soo i try this in console it works : let a_tuple = (3,"three");; then: let (x,y) = a_tuple;; , i get the x and y receiving the values of a_tuple positions
<MrMateus>
i did very similar in file but it gives syntax error