phoe changed the topic of #lisp to: Common Lisp, the #1=(programmable . #1#) programming language | <http://cliki.net/> <https://irclog.tymoon.eu/freenode/%23lisp> <https://irclog.whitequark.org/lisp> <http://ccl.clozure.com/irc-logs/lisp/> | SBCL 1.4.16, CMUCL 21b, ECL 16.1.3, CCL 1.11.5, ABCL 1.5.0
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<White_Flame> if you have {x:?X} unified against {x:{y:foo}}, then you'll get ?X = {y:foo}
<White_Flame> the only difference with standard unification is that you need to do a set union+difference of the keys of the 2 hashtables
<White_Flame> and construct a new hashtable if you have the equivalent of {x:? . ?rest}
<White_Flame> which would split {x:1 y:2 z:3} into ?rest = {y:2 z:3}
<aeth> It's not a hard concept, or an unusual concept, it's just slightly different.
<White_Flame> oh, and variable keys would need multiple results: unify {?:3 . ?} with {a:3 b:3 c:3}
<aeth> I think the first thing this library would need to do is introduce the trivial HASH macro (or HASH-TABLE or whatever) that turns (hash :foo 42 :bar 43) into (let ((#:hash1234 (make-hash-table))) (psetf :foo 42 :bar 43) #:hash1234) because now we have a concise way to say (hash :a 3 :b 3 :c 3)
<aeth> oops the psetf needs to setf on the gethash
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<rpg> White_Flame: I don't need anything as ambitious as matching on values; just keys + values. It occurs to me that what I'm looking for is DAG unification (well, for DAGs with named edges).
<rpg> aeth: One way to think about it is that unification solves equations over a particular kind of symbolic algebrar.
<rpg> s/algebrar/algebra/
<White_Flame> ok, then you just need a representation for an "entry". A cons cell probably suffices
<White_Flame> but I think your problem is still strangely specified
<White_Flame> are you always going to "unify" two hashtables where 1 is exactly 1 element shorter than the other?
<White_Flame> do you have actual unification variables?
<rpg> White_Flame: The two tricky details are paths in the unifiers, and that the semantics is that if you don't have an entry for a key, then you match *any* entry for that key.
<White_Flame> what's the issue with paths?
<White_Flame> if there is a key whose value is another hashtable... then that entry is simply that key/value pair
<White_Flame> I think showing an example would be good
<aeth> You could probably greatly simplify things by assuming keyword/symbol keys...
<aeth> if you don't need to support an arbitrary hash table
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<rpg> So we extend your example to {x:?X} {p: foo x: { y: {z: bar}}} and we get a unifier that is ?X = {y: {z: bar}} and... I'm not sure what I do with p: foo.... In this case I guess it's the same as if there is an additional, implicit top-level variable -- ?TOP1 = {x: ?X}, ?TOP2 = {p: foo x: { y: {z: bar}}} and ?TOP1 = ?TOP2...
<rpg> aeth: You are right -- symbolic, or even keyword keys are good enough for me.
<White_Flame> that wouldn't actually unify in what's normally done
<White_Flame> because you're trying to match a hashtable of size 1 with one of size 2
<White_Flame> eliminating the keys adn converting them to positional slots, it'd be like trying to unify (?X) with (foo (bar))
<rpg> White_Flame: Right; that's what's difficult about this case; the entries are extensible. That's why I was saying that the semantics are odd.
<White_Flame> but {x:?X . ?} would unify with that p:foo table
<White_Flame> as would {x:?X ?:?}
<White_Flame> because that's compatible with a 2-element table
<White_Flame> having hidden implicit matches I think is bad idea
<rpg> White_Flame: If this was prolog, I would make these things out of difference lists, like your {x: ?x . ?} -- these are data structures that are extensible.
<White_Flame> ie, have magic result buckets for differing-size tables
<White_Flame> prolog does have the equivalent of hashtables, with key/values and these sorts of operations
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<rpg> White_Flame: That's a neat idea, because I can treat these objects as always having a sort of &rest logical variable.
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<White_Flame> (I did say I thought that was a bad idea ;) )
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<rpg> If I do that, then standardization (making variables unique) will solve my problem, because the logical variable for the "hole" will always end up with a unique name.
<rpg> Then there's only the more limited problem of treating these things as non-positional.
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<rpg> White_Flame: Your suggestion is really like difference lists; thanks for mentioning that -- it suggests a path to a solution.
<White_Flame> I've thought about this a long time for our tools, and it actually ends up exacly the same a prolog's tools
<rpg> The issue for me is that I want to have operations on something like a python dictionary, *but* I want to be able to backtrack over it, so doing the updates by something functional.
<White_Flame> backtracking & search are beyond unification
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<White_Flame> unification is just a single step in a backtracking search
<White_Flame> it doesn't encompass the search itself
<rpg> White_Flame: There were a lot of good ideas in prolog, but it never caught on.... I think for good reasons. But some of the ideas developed for programming it are quite clever...
<White_Flame> my biggest problem with prolog is that there's too many imperative practicalities shoved into it, breaking its declarative nature
<White_Flame> but yes, it is a great language in concept
<rpg> White_Flame: Yes, that's true. It's possible that what I need is simply a data structure with an undo-able assignment. More thought is required!
<White_Flame> also, probably the only non-Lisp homoiconic language of note
<rpg> White_Flame, aeth -- thanks for discussing this with me. I have to go now -- there is a dog scraping at the door. Hope to chat with you again sometime soon. Good night!
<dlowe> tcl
<White_Flame> tcl is a concatenative language
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<White_Flame> there isn't really any structure to be homoiconic with
<dlowe> space delimited strings is a structure
<dlowe> it's of note, it's not lisp, and it's homoiconic
<White_Flame> its homoiconicity is very arguable
<dlowe> apparently
<rpg> I think homoiconicity requires something stronger -- something intuitively like "the syntax IS the abstract syntax tree."
<White_Flame> or put differently, TCL's syntax is degenerate to a point underneath which homoiconicity is determinable :-P
<White_Flame> erm, not stated exactly correctly but whatever
<aeth> cltcl when?
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<no-defun-allowed> Common Lisp the Common Lisp?
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<oni-on-ion> tcl strings all the way down
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<beach> Good morning everyone!
<Lycurgus> moin beach
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<anamorphic> In SBCL, is there some way to treat a compile warning as an error?
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<logicmoo> the best alternative to prolog is OPS5
<oni-on-ion> why not Logtalk ?
<logicmoo> (written in lisp even)
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<oni-on-ion> "The first implementation of OPS5 was written in Lisp, and later rewritten in BLISS for speed. " <--- are you sure
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<logicmoo> the problem i have againt Logtalk is merely that it is an experiement with static OO (that never gets to OO)
<oni-on-ion> experiment? it feels quite mature
<logicmoo> its very mature.. but all it need is aobut 500 lines of code to do the type of OO i am refering to
<logicmoo> ("but" there is that the author code introduce those lines even but hasnt)
<oni-on-ion> "type" of OO <--- wait wait. types and oo? =P
<logicmoo> in fact at his place of business (Kyndi) he had to pay someone 6k $ to circumvent his not adding it :)
<logicmoo> sorry i just mean OO that lets you call "new" on a virtual object
<oni-on-ion> thats about half a year salary for me
<logicmoo> what he does is creates a new "module" for each new instance
<logicmoo> though i did mean static types.. he does have that!
<logicmoo> but lets say you want to (make-isntance 'Person :name "Fred") (make-isntance 'Person :name "Joe") .. you cannot do that in Logtalk
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<logicmoo> you have to litteraly design a "type" with a name of Joe and another type named of "Fred"
<logicmoo> which is very fun in an experimental way
<oni-on-ion> hmm
<oni-on-ion> for strings ..?
<logicmoo> and you can _even runtime generate those modules_ (Types = MNodues) in Logtalk.. Instance == modules to
<logicmoo> well you wouldnt want to use strings here you use Atoms
<logicmoo> he wanted to show off that neat trick where instances are just inheriting from a parent instance
<logicmoo> nothing wrong with this at all! the only problem is that is the only type of instancing/iheritance available
<anamorphic> oni-on-ion, thanks for that pointer. Didn't think to look in asdf for hints
<oni-on-ion> anamorphic, np hope you find the solution. i'd like to know it as well
<oni-on-ion> logicmoo, hmm well about modules, i'm still learning them in OCaml and their clear difference between "Objects/Classes"
<logicmoo> where program programmers normally will pass aorund a term refernce like person("Joe") and person("Fred").. Logtalk does not yet supprt this.. it could ina couple hundred lines
<logicmoo> program programmers/prolog programmers
<logicmoo> the term reference model is the most propular and there is even low level support .. basically its like a C struct
<oni-on-ion> hmm i havent had the chance to use Logtalk
<oni-on-ion> it looks robust and well thought out though
<logicmoo> i go for it about once a year for about 10 years now .. the author is awesome dude.. i love the concept
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<oni-on-ion> cool =)
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<logicmoo> he wants to open peoples mind to his "static object system"
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<oni-on-ion> been avoiding the OO-stuff in ocaml (interestingly, objects can be created/instantiated without classes), but learning all the Module stuff
<oni-on-ion> prolog KB is a bit static anyway, by nature: what with assert/etc not entirely meant to be "dynamic"
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<oni-on-ion> also see: dynamic predicates
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<logicmoo> it comes down to Object = Code Modules.. and Logtalk doesnt want to cupprt dynamicly crea5ed isntances.. since veryhting a person might create an object for can be redesigned
<logicmoo> i meran anything that needed "dynamic" Code Modules .. are dubious and proabably should be redesigned
<logicmoo> in order to support lisp CLOS i could not use Logtalk :(
<oni-on-ion> heh unless you restart the PL system on each class change =)
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<logicmoo> I ended up using all 6 data models for CLOS objects (the user can choose!) .. they can keep Fields in the assert/retract database.. they can call static code (for read only fields) .. i support FFI Object OO, Hashmaps, ALists and Prolog-Terms-Refs
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<logicmoo> Logtalk could have done that to
<logicmoo> Paulo wants *everyone* to use "call static code" so ensures that was all the language could support.. I want *everyone* to use assert/retract since that is the most OPS5-y .. but neither I or Paulo should get our way
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<logicmoo> hereis all the code Paulo and i would need to create a "getter" https://github.com/TeamSPoon/wam_common_lisp/blob/master/prolog/wam_cl/soops.pl#L643-L689
<logicmoo> line 664 allows me to use logtalk objects
<oni-on-ion> six! *reads*
<oni-on-ion> this reminds me of an ocaml library, forget which; that supplies two intrfaces, "Modular" style code and "OO" style code. i think it was ocaml
* anamorphic only ; caught 4408 STYLE-WARNING conditions to go
<oni-on-ion> anamorphic, wow. maybe suppress is what you want =)?
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<logicmoo> yeah .. deep down it is all about style
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<logicmoo> (making multiple styles ubiquitous implementation-wise)
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<anamorphic> Yeah, I have a macro that creates a function with signature &rest rest &key ... lots of key args, but the logic inside the uses the rest argument to do the processing of the key args. It's harmless, but I can probably generate a (declare (ignore ...)) as part of that definition
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<oni-on-ion> ah he/she left
<oni-on-ion> logicmoo, what about prototypes/cloning ?
<logicmoo> cloning can be used to "break an instance off" from its prototype
<logicmoo> though a clone can still be achived via useage of prototype as long as a prototype field values wont affect the extender (non-prototype object)
<logicmoo> in my impl since i have to roll back side effects for "unwinding objects" i litternaly extend the object each time the program sets a feild
<logicmoo> allows my to roll back by just returning the parent class reference
<logicmoo> i wished/need Logtalk to to that to ( in cases of Prolog backtracking )
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<oni-on-ion> it feels disparate
<oni-on-ion> ie. if the cloned-from proto was changed and other such situations
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<logicmoo> I suppsoe every time you clone something you can perhaps create a second clone that takes over for the oringal
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<logicmoo> (the system in this case makes all callers find the original thru a replaced (repointed to) refernce)
<oni-on-ion> hmm true; sounds like functional record update (FRU) now =)
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<logicmoo> speaking of "clone" if i could clone someting other than a dictionary in Logtalk it'd have all teh features i could ever want https://logtalk.org/library/predicate_index.html#clone-3
<logicmoo> or _if_ i could make a dictionary pretend to be any object
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<logicmoo> every year i check logtalk.. maybe next year!
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<logicmoo> i assume it is not a technical barrier but a design or relgious barrier
<logicmoo> but heh I actually ask him and report back in ##prolog what he says
<oni-on-ion> hmm =)
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<logicmoo> If he accepts this https://pastebin.com/DN6X5iYg i will even create a OPS5 binding in Logtalk
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<oni-on-ion> hm
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<oni-on-ion> Objects are interesting, but i've been wondering what "Subjects" would be like. modules perhaps?
<loke> oni-on-ion: that would be your code
* oni-on-ion ponders
<oni-on-ion> so objects = data, subjects = code ?
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<logicmoo> Logtalk might call those "protocals" as long as you didnt mean "Subject Predciate Object" :P
<oni-on-ion> oh traits / types ?
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<oni-on-ion> well if Object were "addition" and Subject were "subtraction", perhaps. im not quite sure...
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<gabbiel> can macros have setftability, or are only functions allowed to have setftability?
<LdBeth> gabbiel: you mean (setf macro-function) ?
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<beach> gabbiel: I think you must give an example of what you think you can or can not do.
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<aeth> gabbiel: the macro equivalent is defsetf iirc. Also, sometimes you get setf for "free" with a macro if e.g. you have a macro that expands to (aref foo 42) it will work as expected with setfs... iirc
<aeth> hmm, yes, defsetf supports functions or macros. http://www.lispworks.com/documentation/HyperSpec/Body/m_defset.htm
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<fivo> scymtym: Good morning
<fivo> scymtym: Do you want to share your thoughts/ideas on macroexpansion with source location annotations?
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<scymtym> fivo: hi. sorry, i'm super busy today
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<fivo> scymtym: sure, no worries
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<fivo> scymtym: do you want me to open a git issue, so you can reply when it suits you and we also have a better trace of the thing?
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<scymtym> fivo: i'm not sure this is in scope for concrete-syntax-tree (if that's the project you wanted to create the issue in)
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<schweers> Are macros at a toplevel somehow special? I have a macro which I have been using for a long time inside fiveam tests to setup my fixtures. I now tried to use this as a toplevel form in order to not run the test setup for every test case, and it doesn’t seem to macroexpand.
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<beach> It should.
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<fivo> scymtym: yes I was thinking of cst. Why do you think it's outside of its scope? The final output would be a cst of the expanded macro call.
<fivo> scymtym: anyways just let me know if you want to have a discussion on it somewhere
<logicmoo> oni-on-ion: he replied.. turns out to be religious reasons: https://gitter.im/LogtalkDotOrg/logtalk3
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<schweers> Oh my. I had a typo in the macro name.
<oni-on-ion> ah wait didnt i mention "functional record update" ? o_o
<beach> schweers: You should have gotten a warning about an undefined function. No?
<schweers> If so, I didn’t see it.
<beach> Hmm.
<beach> I take my warnings very seriously, which is why I am a bit annoyed, when there are "note"s that I can't seem to avoid, because they force me to look at every compiler message to make sure I am not missing anything.
<oni-on-ion> is there a way [for sbcl] to treat warnings as errors? someone asked earlier
<shka__> no
<shka__> as far as i know
<beach> ASDF can do it though, as I recall.
<shka__> oh, that's cool
<beach> asdf:*compile-file-failure-behavior* it seems
<aeth> Can it do it for warnings and not notes? Or is it for everything? Because some notes in SBCL seem literally impossible to avoid. Like "hey, if you change the semantics of your program, it's faster".
<beach> I set it to IGNORE when I had to compile huge sequence functions. I should set it back to whatever it was.
<shka__> aeth: i think so
<jackdaniel> sbcl has muffle-warnings machinery
<jackdaniel> to filter what you are not interested in
<oni-on-ion> beach, ok, thats what i found earlier as well
<beach> jackdaniel: Can it filter notes?
<beach> jackdaniel: I am interested in every warning, but usually not in the notes.
<jackdaniel> afair it works on condition class basis
<jackdaniel> so if notes have their own class, then it should work
<beach> I might look into that.
<jackdaniel> i.e (declaim (sb-ext:muffle-conditions sb-ext:compiler-note))
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<beach> Thanks!
<jackdaniel> sure
<aeth> jackdaniel: oh cool, I guess I can locally declare a muffle for note in this one place that has to be both (speed 3) and a rational. thanks.
<aeth> (it's a typecase... the last, slow case is naturally something that SBCL's optimization notes don't like)
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<gabbiel> Sorry I was sleeping and now saw messages. Aeth: so if it expands into a seftable function, then it's seftable?
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<jmercouris> so I'm having an error in loading my website, loads fine on macOS, doesn't load fine on my FreeBSD install
<jmercouris> however, the error doesn't appear to be a difference between anything, both are SBCL, same version
<jmercouris> I already tried clearing the cache
<jmercouris> I believe it thinks that DEFTABLE is a function call, when it is actually a macro provided by mito
<Bike> that's what it looks like to me.
<jmercouris> see here: https://github.com/fukamachi/mito/
<jmercouris> now here's the interesting thing though, if you see packages.lisp (also in the gist), you'll see I'm using all the symbols from mito
<Bike> this doesn't seem like an OS-variant kind of error. are you totally sure you're running the same thing on each system?
<jmercouris> I'll recopy the folder onto the server again just to make sure
<jmercouris> one moment please
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<jmercouris> same exact issue
<jmercouris> maybe the versions of quicklisp are different
<jmercouris> ah, they are using different versions of quicklisp, I will update and try again
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<Bike> maybe the mito in one doesn't have deftable.
<jmercouris> ok, so that was the problem
<jmercouris> indeed, the older version of mito didn't have deftable
<jmercouris> thank you for the rubber duck services :D
<Bike> i live to serve
<jmercouris> Lol, nice
<jmercouris> You also use BSD?
<Bike> nope
<Bike> like i said, nothing to do with operating systems here
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<jmercouris> I see
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<ebzzry> what ffi library can you recommend to interface with python?
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<remexre> Can I make a method that dispatches on an argument by value?
<Bike> you can use an eql specializer, if that's what you mean.
<Bike> (defgeneric foo (x)) (defmethod foo ((x (eql 5))) 7) (foo 5) => 7
<remexre> okay, thanks!
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<dlowe> it won't work with strings, or structured data
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<flip214> (ql:who-depends-on :alexandria)
<flip214> that gives me NIL, which is unexpected
<flip214> ouch
<flip214> (ql:who-depends-on (ql-dist:find-system :alexandria))
<flip214> is rejected with an error, but the other is not - and both are wrong
<flip214> (ql:who-depends-on "alexandria")
<Xach> flip214: "alexandria" would get what you seek. i think someone has a PR for making it downcase by default.
<flip214> works
<flip214> Xach: ah, thanks
<flip214> would've been my next thought ;)
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<nicklaf> I am reading the introduction to R5Rs, where the features that scheme introduced to lisp are enumerated
<nicklaf> I would be curious to know if any of these features didn't make their way into common lisp
<nicklaf> I guess hygienic macros would be one
<nicklaf> "Scheme was one of the first programming languages to incorporate first
<nicklaf> class procedures as in the lambda calculus, thereby proving the
<nicklaf> usefulness of static scope rules and block structure in a dynamically
<nicklaf> typed language."
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<nicklaf> and then: "Scheme was the first major dialect of Lisp to distinguish procedures from lambda expressions and symbols..."
<pfdietz> Scheme has guaranteed tail calls, CL does not. Scheme evaluates the operator position of an expression the same way as other positions; CL does not.
<pfdietz> Lisp-1 vs. Lisp-2
<nicklaf> right i was just about to mention that latter point
<nicklaf> but the other ones i'm still figuring out
<nicklaf> many common lisp implementations perform tail calls, i believe?
<pfdietz> They do, but it is not required.
<pfdietz> So you cannot depend on it happening.
<pfdietz> Scheme has explicit continuations (I believe?), CL does not.
<nicklaf> it has call-cc, think?
<nicklaf> *i think
<nicklaf> anyway i've been looking at some very early lisp code, and am unfamiliar with dynamic scope
<nicklaf> and i was somewhat startled by the claim in R5Rs that scheme was one of the first languages to have first class procedures
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<nicklaf> I thought lambdas were in there very the very early days
<nicklaf> and i am still trying to figure out what this has to do with lexical scoping
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<pfdietz> "Most Lisps specify an order of evaluation for procedure arguments. Scheme does not." This difference from CL is, by itself, enough to consign the language to the depths of hell. :)
<Bike> i believe in early lisps, binding was dynamic so there were no actual closures
<pfdietz> That's right.
<nicklaf> ahh that makes sense
<nicklaf> that sounds kind of insane
<Bike> and scheme, like, the RABBIT compiler and stuff, early on, was all lexical
<Bike> which lisps at the time probably weren't, but i'm not sure.
<tfb> nicklaf: I think Scheme was one of the first implementations to have really coherent lexical scope, and you could argue functions are not first class without that
<nicklaf> tfb: thanks, i think that's what R5Rs is saying
<nicklaf> i think i understand now
<tfb> Lots of older lisps had dynamic scope in the interpreter and perhaps half of lexical scope in compiled code (so, yes, code behaved differently if it was compiled)
<tfb> 'half of lexical scope' means lexical scope but definite extent
<nicklaf> do you think this was a hardcoded limitation made to make implementation possible?
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<tfb> I think many people thought that dynamic scope was better (this seems odd now but I have heard this from people). But it's a bit hostile to any reasonable compilation strategy, so they compromised.
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<nicklaf> According to Paul Graham, there is a typo in Mccarthy's original 'metacircular' eval function, and graham blames it on dynamic scope
<nicklaf> actually i take that back
<nicklaf> i think he might have said that it was because it was written before it was programmed :)
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<nicklaf> or, no, i was right the first time: "It's an eloquent testimony to the dangers of dynamic scope that even the very first example of higher-order Lisp functions was broken because of it. It may be that McCarthy was not fully aware of the implications of dynamic scope in 1960."
<tfb> nicklaf: incidentally it looks like Standard Lisp (which is what I learnt, really) has just this weirdness: see http://user.ceng.metu.edu.tr/~ucoluk/research/lisp/generalinfo.html (the PDF report, p16)
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<tfb> I think it was also a lisp-1 (at least, something I used in that era was): lisp-1s with dynamic scope can be ... exciting, in bad ways
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<pfdietz> I have wondered if the scheme-ish approach of compiling with continuations would be useful for a CL compiler where one would want to be able to recompile functions even when they are on the current call stack (for example, if class definitions changed).
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<amerlyq> pfdietz: sounds like a good way to splash your brain matters over walls. Execute half of continuation, then recompile, and... continue from the middle of "somewhere"
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<Josh_2> Worked out how to do clicking with xlib thanks to this :) https://github.com/VitoVan/cl-dino/blob/master/cl-autogui.lisp
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