jackdaniel changed the topic of #lisp to: Common Lisp, the #1=(programmable . #1#) programming language<http://cliki.net/> logs:<https://irclog.whitequark.org/lisp,http://ccl.clozure.com/irc-logs/lisp/> | SBCL 1.4.5, CMUCL 21b, ECL 16.1.3, CCL 1.11.5, ABCL 1.5.0
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<kristof> So, uh
<kristof> I have stumbled onto something quite accidentally that I read about exactly once in an erik naggum flamewar and I would like to know where in the spec this particular behavior is described
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<Bike> enticing.
<kristof> (defvar variable-name) (defun function-name (variable-name) ;;body) will *bind* variable-name to the value
<Bike> you mean, will be a special binding? yes.
<aeth> expected
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<aeth> I wonder, is there a portability library for lexical globals? Is it common enough?
<kristof> there's no need due to naming conventions
<kristof> I just chose to eschew the naming conventions today and immediately discovered why there are naming conventions
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<Bike> so if you're asking what says this is the case, it's described in
<Bike> clhs special
<Bike> "When used in a proclamation, a special declaration specifier applies to all bindings as well as to all references of the mentioned variables."
<Bike> and defvar/parameter make such a proclamation.
<aeth> There are so many fun ways to avoid globals. You can create a closure by putting one or more defuns in a top-level let, for instance. Or you could create a macro that tracks what you want to track.
<kristof> Ok, my confusion has been dispelled.
<kristof> I do like globals. They're in the language, and special bindings are unique among all the lexically scoped languages that they deserve to be understood and used.
<aeth> This is one way I avoided having a global variable via a macro: (let (... (version (if (fboundp name) (multiple-value-bind (value version) (funcall (fdefinition name)) (declare (ignore value)) (if (and version (integerp version)) (incf version) 1)) 0))) ...)
<aeth> I turned the second return value into the version counter for redefinitions
<kristof> I was actually using a defvar in this case to specify a dynamically scoped value that I just didn't want to pass as an argument. I find that valuable
<kristof> I do wonder why there wasn't a lexical declaration
<aeth> That does make sense, but I find that the things that make sense as special variables usually already exist (things like *standard-output*)
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<kristof> and why it wasn't enforced for, say, defun params
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<Bike> if you declare a variable special _locally_, and then bind it again in that extent, that binding will be lexical, so no need for a declaration
<Bike> proclaiming something globally special is extra special
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<didi`> Can I define methods on struct types?
<Bike> if the defstruct doesn't have a head :type option, yes
<didi`> Bike: Thank you.
<Bike> try (find-class name nil). if you get a class, you can use it as a specializer for methods
<didi`> Nice.
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<didi`> Hum, SBCL must do something interesting with the order of slots of a struct, because changing the order of the slots and redefining the struct freaks out the compiler.
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<Bike> well, it uses that order for the internal data layout
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<Bike> hypothetically i guess it could recognize that you only permuted them
<flip214> didi`: just redefine the same struct a second time ;)
<flip214> that will be silent.
<Bike> redefining a structure class is undefined behavior
<Bike> in sbcl's case it means anything using parts of the structure definition will need to be recompiled
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<didi`> Heh, I redefine structures all the time. :-P
<flip214> me too.
<didi`> "Ops, I forgot to add a specific slot. Redefining it, it is."
<flip214> and ASDF's :SERIAL T takes care of recompilation most of the time
<Bike> it's one of the criteria santa uses, you know
<flip214> yeah, or changing a type afterwards...
<didi`> Bike: :-P
<flip214> Bike: that's not a strong argument in central europe
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<beach> Good morning everyone!
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<oni-on-ion> good morning
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<Myon> svillemot: hi, are you taking over cl-interpol (#900623), or should I upload a fix?
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<svillemot> Myon: I'll do it
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<Myon> svillemot: thanks
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<knobo> I've made a live-reload prototype for clack. It works for files, but now I want to add support for reload when I recompile a function.
<knobo> But it could get quite complicated.
<beach> What is "clack"?
<knobo> beach: Web application environment for Common Lisp
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<knobo> I'm not shure if it would be possible to do what I want.
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<knobo> I want to find out what could be possible.
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<knobo> Like, if it is possible to trace the function call tree when an url is accessed, and send update to the browser when any of those functions are recompiled.
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<akkad> everyone knows about clack!
<blep-on-external> clack sounds complicated
<blep-on-external> it's about the same as bare node.js in my opinion
<knobo> blep-on-external: bare node.js?
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<knobo> Maybe use some xref functionality, but I still don't know how to hook that in to the compiler.
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<blep-on-external> like you're given the request object and the response object and you have to parse them and all tha
<blep-on-external> *that. very bare.
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<knobo> blep-on-external: but nobody uses only clack. Most people would use somthing on top. For example caveman.
<v0|d> Xach: no bits type in ecl afaik (declare (type .. bits)) fails in salza2. maybe #-ecl.
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<knobo> I appreciate any suggestions.
<knobo> maybe I should talk to #sbcl.
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<fe[nl]ix> merhaba v0|d
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<v0|d> fe[nl]ix: lol
<v0|d> i should go an learn some romanian, embarrasd*.
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<akkad> da
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<blep-on-external> i still use hunchentoot, should i move to caveman?
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<Xach> v0|d: bits is the variable, not the type
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<v0|d> oh.
<v0|d> right. so what about this bitstream-buffer-bit-count?
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<Xach> v0|d: it's defined in types.lisp
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<v0|d> can't reproduce, wierd.
<v0|d> sry.
<Xach> no worries
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<jmercouris> I'm looking here at gentle introduction to symolic computation and they say you can only sharp-quote normal functions, can't do it for macro functions
<minion> jmercouris, memo from flip214: if the image is uncompressed, the mmap() is quite fast. if it's compressed, larger images will take more time to run.
<jmercouris> I see
<jmercouris> yet, in SBCL, I can #'if no problem
<jmercouris> is this something that SBCL does not obey from the specification? is the author mistaken?
<jmercouris> CL-USER> #'if -> #<CLOSURE (:SPECIAL IF) {1000D8796B}>
<shka> wow
<shka> i had no idea that you can #'if in sbcl!
<ebzzry> jmercouris: sbcl takes that liberty. ccl and clisp barfs with #'if.
<shka> jmercouris: don't count on doing that though, standard states that if is a special form and it is up to implementation to decide how to implement it
<jmercouris> I see, so undefined
<shka> yes
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<shka> as for #' in macros
<jmercouris> What's the equivalent of sharp quoting a macro?
<jmercouris> is there a way?
<shka> honestly it never occured to me
<shka> because who would want to do it anyway?
<shka> what for?
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<jmercouris> no reason, just wondering
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<shka> i see
<ebzzry> jmercouris: so, yes. it is not portable behavior.
<jmercouris> I see I see
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<jmercouris> I always thought mapcar was a strange name, and it only just occured to me that we are mapping a function onto the car of each cons cell
<jmercouris> unbelievable...
<ebzzry> jmercouris: :)
<ebzzry> jmercouris: see mapcan. :)
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<jmercouris> Aha, so many derivatives
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<jmercouris> ebzzry: I'm not there yet though, don't want to go down that rabbit hole just yet, first I would like to finish this book
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<ebzzry> jmercouris: CLAGITSC by Touretzky?
<jmercouris> Yes
<ebzzry> jmercouris: that’s a good book.
<jmercouris> I've already done PCL, and I've been doing some lisp programming for approximately a year now, but I felt there are so many gaps in my knowledge, decided to go back to basics from cover to cover
<ebzzry> jmercouris: that’s the path that I suggest. CLAGITSC before PCL.
<jmercouris> Well, it's too late now :D
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<ebzzry> jmercouris: that’s ok. you’ll get a better appreciation of recursion in lisp with that book.
<ebzzry> jmercouris: and some introductory concepts of symbolic programming.
<jmercouris> I intend to become much better at recursion, its been a weakness of mine for a long time
<jmercouris> Yeah, I like the book, because it is indeed gentle
<jmercouris> there are some exercises where I feel like I am wasting my time, but for the most part, it has been a very valuable experience
<ebzzry> jmercouris: [:
<knobo> blep-on-external: Depends on your project.
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<beach> jmercouris: You can use MACRO-FUNCTION to get to the function that a macro defines, but it has a strange signature, so you can't just FUNCALL it with the arguments to the macro.
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<jmercouris> beach: interesting, thanks
<jmercouris> the hyperspec makes it sound like a predicate
<beach> Oh?
<beach> clhs macro-function
<jmercouris> "Determines whether symbol has a function definition as a macro in the specified environment. "
<beach> You need to read further, I guess.
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<jmercouris> Yeah, I read the whole thing, its just a strange way to start the description
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<beach> I guess I can test the memory allocator by allocating and freeing random chunks and verifying after each operation how much total space is left on the heap.
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<Josh_2> I guess you can
<shka> beach: that's what i would do
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<beach> Anything else I can test?
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<shka> let i run for half a day, and keep verifing memory
<shka> beach: maybe verify whole heap with checksums?
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<beach> How so?
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<shka> beach: scudo allocator embeds 16 bit checksum into chunks
<shka> so they can verify if chunk was corrupted somehow
<beach> Oh, I see.
<shka> not sure if you can easily do something similar, but it may be helpfull debuging tool
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<beach> Absolutely. I'll think about it.
<shka> maybe you can maintain separate checksum list just for testing
<beach> Maybe so.
<beach> I'll do the simple one first. Then we'll see.
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<Xach> borodust!!!
<Xach> borodust: the cl-muth problems vex me!
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<lthms> hi
<jackdaniel> are we shifting towards latin or something in this spirit lately? ;)
<jackdaniel> \o
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<makomo> o/
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<borodust> Xach: hi!
<borodust> lets see
<borodust> Xach: looks like it is fixed itself - i don't see it in the last report ;p
<Xach> ok phew
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<borodust> or well, maybe you just removed it XD
<Xach> no, i think it is resolved. thanks for double-checking!
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<borodust> it's weird, it should have been fixed a week ago when i saw it first appeared in 06/25 report..
<Xach> i think i had stale repos from 6/22
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<Xach> i updated things to have a fresher start
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<borodust> Xach: ah, i see, thanks!
<borodust> hello lthms o/
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<cnx> hi guys, suddenly my swank from emacs cannot be loaded, saying `Package ASDF does not exist.'
<cnx> it run fine a few days earlier and I didn't run any update or tweak any config
<cnx> anybody?
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<jackdaniel> cnx: I assume you try to load *all* contribs including swank-asdf, because swank itself does not depend on asdf whatsoever
<jackdaniel> most likely scenario is that you had quicklisp initialized in your implementation init file (i.e ~/.sbclrc) and you have removed it
<jackdaniel> just put "(require 'asdf)" in ~/.sbclrc in that case
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<theseb> is this a great macro strategy?....do as much as you can with a "normal" function and then call that helper function from your shiny new macro?....in short..use macros to change the syntax of the language but do the real work in regular code?
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<beach> Sounds good.
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<theseb> beach: thanks...people were always warning about overdoing it with macros...my strategy above seemed like such a simple way to strike a balance...it should be more widely taught
<beach> theseb: It's the traditional way of doing it, but perhaps it is not said so explicitly in the literature.
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<theseb> beach: ah ok thanks
<beach> There is an exception for very small macros.
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<beach> But if you look in the CLIM II specification, for instance, you will find several pairs like WITH-FOO and INVOKE-WITH-FOO.
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<jmercouris> let's say I want to write my own setter instead of using the default accessor
<jmercouris> how would I refer to a given slot without an accessor?
<Xach> slot-value
<jmercouris> Ah, okay, thank you
<beach> jmercouris: But why would you want to do that?
<Xach> another option is to use :writer (setf %my-slot)
<jmercouris> beach: Because I want side-effects to occur when a given slot is changed
<Xach> jmercouris: one way to do that is an around method on the setter.
<jmercouris> I have an interface object that abstracts an interface framework
<beach> jmercouris: Use an auxiliary method on the setter.
<Xach> or after, or before method.
<theseb> Xach: everyone knows Common Lisp is the Lisp for "real work"...however...I've been checking out Clojure which seem to also be good for "real work" since uses JVM...what do think of Clojure?
<theseb> if i may ask?
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<jmercouris> beach: Ok, will do
<Xach> theseb: I don't think about it. And this is not the channel to discuss it.
<beach> theseb: Off topic. Sorry.
<jmercouris> Isn't it possible to run CL on the JVM? I thought there was an implementation that had interop of some sort
<beach> ABCL
<Josh_2> That's wrong, it's ABCD
<Josh_2> idk who taught you the alphabet hue hue
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<jmercouris> No, it isn't it is ABCL
<jmercouris> https://abcl.org
<jmercouris> Oh, I see it was a joke
<Josh_2> xD
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<figurelisp> I have heard a lot about lisp. Is it good to learn it now? I am thinking about common lisp
<figurelisp> Why should i learn lisp is my main question.
<Josh_2> yeh u should learn it
<beach> figurelisp: Because it is one of the best languages around.
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<francogrex> hi, I have a lisp (or fasl) file in a specific common network directory/folder (UNC path: //network1/specs/called.fasl) that is being loaded from a user's local lisp program. is there a way to make sure that the user is loading that specific fasl file (and not a local one he may have copied into his local folder?)
<Josh_2> beach: what's another?
<beach> figurelisp: And it will change your way of thinking about programming.
<figurelisp> Is lisp seriously that good
<Josh_2> You'll have to find out ;)
<ebrasca> For me it is.
<jmercouris> We are all extremely biased in this channel
<figurelisp> I'm new in programming so i don't know other languages well and won't be able ito compare it
<Josh_2> ahh
<jmercouris> I think it is best to learn it when you are new to programming
<beach> figurelisp: It really is that good.
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<jmercouris> becasue you won't be influenced by prior knowledge
<Josh_2> well I learned CL first and now I don't want to learn any others cos I'm lazy and they suck
<ebrasca> figurelisp: Yea it is #lisp irc .
<jmercouris> Josh_2: How would you know? You don't know any other langauges
<Josh_2> jmercouris: av done Python, Ruby C++ ya know
<figurelisp> Josh_2 if you haven't learned any other how do you know they suck
<Josh_2> and Javascript n PHP
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<Josh_2> meh they probably don't, they have their place like
<jmercouris> Anyways, these kinds of debates are pointless, if you wish to learn Lisp, obviously you'd have the endorsement of this channel
<ebrasca> I hate Javascript.
<jmercouris> Who doesn't?
<Josh_2> I say you should learn CL :D
<random-nick> jmercouris: many people love javascript
<ebrasca> haha
<jmercouris> random-nick: Secretly they hate it
<ebrasca> random-nick: Are you sure?
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<jackdaniel> any argument supporting my ideas is valid. contrary arguments are just other people delusions (and false claims), like it ought to be ;-)
<random-nick> ebrasca: well, why would thing like node.js exist otherwise?
<jmercouris> figurelisp: If you decide to learn lisp start with this book: https://www.cs.cmu.edu/~dst/LispBook/book.pdf and install this editor: https://portacle.github.io
<Josh_2> figurelisp: get gentle introduction to symbolic computation, is very good intro to programming :)
<figurelisp> I'll be starting learning CL from the book cl: gentle introduction to symbolic computimg
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<Josh_2> ^^ that's how I did it
<jmercouris> jackdaniel: Preach!
<figurelisp> Ok great
<jmercouris> jackdaniel: as long as I agree with you
<figurelisp> Thank you all
<jackdaniel> jmercouris: confirmation bias won't do any good to you. Lisp zealotry just closes you in a fixed mindset.
<jmercouris> jackdaniel: I know, I'm only joking
<jmercouris> I like Lisp, but I won't pretend like it is the best thing to ever happen ever
<random-nick> but what if Lisp really is the best thing to ever happen ever?
<jackdaniel> usually jokes carry convictions despite being humorous, but tha'ts offtopic on my side, sorry
<jmercouris> My convictions are nothing but intense irony
<beach> figurelisp: Make sure you ask for advice when you get ready to install your environment. It is easy to get it wrong.
<beach> figurelisp: Also, it is OK, to paste your code somewhere and give us a link, in case you want feedback on it. Newbie questions are tolerated as long as it looks like you are making progress and following advice.
<figurelisp> Ok thanks :) i have already setup my emacs with slime+sbcl
<beach> OK, good.
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<antoszka> figurelisp: there's also a #clnoobs channel, just in case :)
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<schweers> figurelisp: my advice: don’t let people tell you that the lisp you chose (Common Lisp, as I understand) has some flaw, and that another lisp is better. Or at least in some way better. Its not that they are wrong (if you really want to do functional programming, Clojure has a more pleasant out of the box experience). Its that you shouldn’t let that distract you. I made that mistake, bouncing from one lisp to anothe
<schweers> getting really good with any of them.
<Josh_2> schweers: idk if I agree with you, GISC is a real good intro to functional programming
<figurelisp> schweers will keep that in mind and won't be distracted
<schweers> Josh_2: sorry, GISC?
<Josh_2> gentle introduction to symbolic computation
<Josh_2> something like that
<schweers> ah
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* schweers has to admit to never having read that book
<antoszka> I think "Touretzky" is the recognizable shorthand name for the book here ;)
<Josh_2> Well I didn't know that
<antoszka> That's why I mentioned it :)
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<Josh_2> am gonna forget that
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<jmercouris> When writing predicates, when do you use a hyphen, and when do you just stick it onto the word?
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<antoszka> jmercouris: there's a rule for that
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<jmercouris> And the rule is..?
<schweers> jmercouris: I think most people use a dash if the predicate consists of more than one word
<antoszka> jmercouris: if it's a single word predicate, you just slam on the p
<schweers> i.e. if you have dashes in it anyway
<antoszka> + what schweers says :)
<schweers> composite-type-p vs typep
<antoszka> yep
<schweers> which can muck with automatically named predicates, but that’s another story
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<random-nick> is the proper naming convention for definition macros to prefix with "def" if it is just one word and to use dashes and prefix it with "define-" for multiple words?
<Xach> The rule is explained in CLtL2 and I copied it to cliki some time ago
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<Xach> https://cliki.net/Naming%20conventions - see "By convention, "
<random-nick> thank you!
<Xach> concluding with: The name string-less-p would incorrectly imply that it is a predicate that tests for a kind of object called a string-less, and the name stringlessp would connote a predicate that tests whether something has no strings (is "stringless")!
<Xach> random-nick: sorry, this is for jmercouris's question about predicates
<random-nick> Xach: but the page also answers my question
<Xach> that was not my intent so i cannot take any credit
<jmercouris> Aha, I see
<jmercouris> there is some nuance here
<jmercouris> Makes me feel too much like a comptuer parsing the string
<jmercouris> s/comptuer/computer
<makomo> _death: i think it is done
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<jmercouris> If I use (with-slots) within a method body, is it any quicker than using the slot accessors every time?
<jmercouris> is it even worth thinking about?
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<makomo> jmercouris: i'm not sure if this is correct (someone can correct me), but i would think it could be slower because it has the extra dispatch to go through for the accessor
<jmercouris> makomo: I was thinking that exactly
<makomo> but i don't think it's something you should really worry early on
<makomo> worry about*
<beach> jmercouris: No, and it might be slower.
<beach> jmercouris: I would use WITH-ACCESSORS instead.
<jmercouris> that would be counterintuitive that it could be slower
<makomo> hm, why?
<jmercouris> with-accessors is new to me, thanks
<makomo> jmercouris: also, WITH-ACCESSORS supports any accessor and doesn't have to be used just for objects/slots
<makomo> the clhs page is pretty misleading if you ask me
<jmercouris> ah, that makes it even more useful
<beach> jmercouris: WITH-SLOTS uses SLOT-VALUE. SLOT-VALUE takes a symbol to name the slot. If the implementers are not careful, they have to look up the name, find the slot metaobject, find the slot offset, then access the slot.
<makomo> oh wait, no, i might be wrong
<beach> jmercouris: But the accessor can usually go directly to the slot.
<jmercouris> Oh, I see
<jmercouris> that is an interesting thought
<makomo> beach: we discussed this once -- the fact that WITH-ACCESSORS doesn't have to be used just for slots. is this true or is my memory just failing?
<jmercouris> I feel like maybe the only way to really learn this stuff is to make your own CL implementation of the spec
<makomo> it does take an object though, so i'm not sure what i remember anymore
<beach> makomo: I think it's true. It only introduces symbol macros.
<makomo> ah right, so INSTANCE-FORM could be anything, right?
<makomo> clhs with-accessors
<makomo> i.e. not just an instance
<beach> makomo: Every Common Lisp object is an instance of some class.
<makomo> hmm, right, good point
<makomo> right, heh
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<makomo> then, not an instance of a class that's a STANDARD-CLASS?
<makomo> but i guess that's not surprising at all anyway
<makomo> since everything is an instance of some class
<makomo> hm right, i think now the clhs page is finally clear to me
<beach> Look at the bottom of the Common Lisp HyperSpec page. It says what with-accessors does.
<makomo> i forgot that everything is an instance of some class
<makomo> for some reason i thought you were limited to instanced of classes that are DEFCLASS'd
<makomo> not sure why
<makomo> instances*
<makomo> jmercouris: hmm idk, why would you think that?
<makomo> it's not complicated. maybe it's just because you've only heard about it for the first time
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<jmercouris> makomo: I don't know, I just have these vague ideas in my mind, it would seem to me that with-slots is kind of like some version of let, so you don't have to keep getting the value every time
<jmercouris> and you are just creating a temporary binding
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<jmercouris> I assume that (slot-accessor object) is a funcall
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<makomo> jmercouris: ah, well, it could have been made to do that instead i guess. it's all about the documentation and standardized stuff in the end :D
<makomo> standardizing*
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<beach> jmercouris: SLOT-VALUE is a function call as well.
<makomo> jmercouris: but i think this name is more fitting for the thing it does
<makomo> what you describe is something that could be called SLOT-LET or similar maybe?
<jmercouris> Maybe, I'm not sure
<jmercouris> it is still so vague in my head
<jmercouris> I need to sleep on it, I'm just now beginning to grasp very basic CLOS things
<beach> jmercouris: And, in the worst case, it must find the class of the object (another function call), then find the slot metaobject with that name (another call), then access that object to find the slot offset (another call), then access memory (another call).
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<makomo> jmercouris: heh, that's how i felt while implementing this macro: https://plaster.tymoon.eu/view/844#844. now i finally feel like the idea has crystallized
<beach> jmercouris: There are tricks to get around it when the slot name is quoted, but it is not simple to implement.
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<jasom> beach: can you declare the type of an object in such a way to remove some of those lookups (with declarations in the standard)?
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<Bike> jasom: even if you declare the type of an object, its class could be redefined.
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<Bike> strictly speaking, the compilation semantics allow you not to worry about that, i think
<Bike> ah, no, you actually do have to
<Bike> that is, there's no restriction that the slots of a class have to be the same at compile and run time
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<Bike> the metaclass and superclass only
<Bike> superclass-es.
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<jasom> can its metaclass be redefined?
<Bike> uh... maybe
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<Bike> "Classes defined by defclass in the compilation environment must be defined at run time to have the same superclasses and same metaclass." is the text
<jasom> So it would require a separate declaration that indicates the class would not be redefined.
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<beach> jasom: I don't think declaring the type will help.
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<beach> jasom: But one can play the same kind of tricks as one can with an accessor, provided the slot name is constant.
<beach> jasom: But things may have to be recompiled when the class changes, just like the accessors do. That can be done of course.
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<makomo> what arguments exactly does a macro function take?
<makomo> for example, if i have (macro-function 'alexandria:once-only), how do i funcall this properly?
<makomo> the bottom of this page says that the first argument is the "entire macro call" http://www.lispworks.com/documentation/HyperSpec/Body/f_macro_.htm
<makomo> soo, a list of its arguments?
<makomo> is this correct (funcall (macro-function 'alexandria:once-only) '((x) ((print "hello there"))))?
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<Bike> no, it's the whole form
<pjb> makomo: a form and an environment.
<Bike> and the second argument is an environment. just pass NIL, to indicate the global environment
<makomo> oops, forgot the environment while typing it out
<makomo> Bike: can you clarify what is the "whole form"? literally (once-only (x) (print "hello there"))?
<Bike> yep.
<pjb> (funcall (macro-function 'alexandria:once-only) '(alexandria:once-only (x) (print x)) nil) #| --> (let ((#1=#:once-only175411 (gensym "X"))) (list* 'let (list* (list (list* #1# (list x))) (list (let ((x #1#)) (print x)))))) |#
<makomo> oh huh, it requires the name again? that's weird
<pjb> makomo: it's what you get in the &whole parameter.
<Bike> macro lambda lists can take &whole
<pjb> makomo: it's smart: then you can use the same code for a bunch of macros!
<makomo> i see, but i thought since once-only doesn't have that that i'm good
<pjb> eg. when you define macros to expand to HTML, it's always the same thing. You can have a single macro function for all!
<Bike> macro functions taking different arguments depending on the macro lambda list would be confusing for no reason.
<makomo> i guess that makes sense
<pjb> notice how macro-function is an ACCESSOR! (read AND write)
<makomo> pjb: hm, interesting but i don't get the example. single macro function for all what?
<Bike> meaning you could have multiple names with the same macro-function.
<makomo> ahh
<Bike> like have each html tag bound to the same macro functio, which checks the first element to see what to do.
<makomo> hm, very neat
<pjb> (defun gen-html-tag (form environment) (destructuring-bind (tag &rest body) form `(progn (format t "<~A>" ',tag) ,@body (format t "</~A>" ',tag)))) (setf (macro-function 'a) (function gen-html-tag) (macro-function 'p) (function gen-html-tag) #| …the whole html…|#) (with-output-to-string (*standard-output*) (p (princ "foo") (a (princ "link")) (princ "bar"))) #| --> "<p>foo<a>link</a>bar</p>" |#
<shka_> pjb: you really should not paste such line into irc
<pjb> Now, for html, it's a tad more complex, since there are sometimes optional open or close tag, and various set of attributes, etc. so you'd need more than one function, but, it this could still be used.
<pjb> shka_: It's only 3 forms! ;-)
<makomo> pjb: yup, i see
<pjb> There: https://pastebin.com/bdBpQ4HX better?
<pjb> shka_: but technically I don't paste those lines into irc. I type them right there!
<makomo> is there anything that could go wrong if i just pass in NIL for the envrionment?
<makomo> i mean, are there corner cases where it's required to do so
<makomo> so you have to drag the environment around through everything
<pjb> Yes. It's for local macros (macrolets)
<makomo> anything else?
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<pjb> If you want to call this function from within a macro, you should (defmacro m (… &environment environment) … (gen-html-tag form environment) …)
<pjb> now, notice that the above function didn't use the environment, but if it called macroexpand, it would have to pass it.
<pjb> Notably, macroexpand let you detect or process symbol-macros (not only normal macros), and you would see symbol-macrolets, only by using this environment.
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<makomo> aha
<makomo> welp, that concludes my macro-function solution and it's no better than what i had before
<makomo> i still have to call EVAL manually
<pjb> just add one macro.
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<pjb> makomo: you have a bug in the docstring: "Evaluates INITFORMS to get a list…"
<makomo> mhm?
<pjb> makomo: for a macro, you cannot just "evaluate" something. You have to make it explicit if it is evaluated at macroexpansion time, or if you return a form that will evaluate it at run-time.
<makomo> pjb: right, i meant the former
<makomo> i'll fix it
<pjb> Then it is possible, but difficult. Since this evaluation is done, eg. in the compilation environment, it cannot rely on anything defined in the program.
<pjb> Only things loaded in the compilation environment.
<makomo> yes, indeed
<pjb> So you need to have a good reason to be wanting to do that.
<Bike> makomo: (defun zip (&rest seqs) (apply #'mapcar #'list seqs))
<makomo> Bike: heh yeah, not sure why i have an extra layer of indirection there, thanks
<Bike> eval-with is scary
<makomo> i know :D
<makomo> pjb: right, and the context is this: we were discussing how to solve the multiple evaluation problem when you don't know the number of symbols "at compile-time" (???)
<pjb> makomo: but as I said, you only need to add a macro. Ie. instead of evaluating initforms in the once-only-list macro, evaluate it at macro expansion time in a macro that expands to once-only-list (or whatever).
<makomo> not sure if that's the right terminology, but i hope you get what i mean -- you can't tell ONCE-ONLY to do it for a list of symbols
<makomo> pjb: ONCE-ONLY-LIST injects the macroexpansion-time evaluation into another macro
<makomo> and FBIND is the one that ends up evaluating at macroexpansion time
<makomo> so it can make ONCE-ONLY work for an arbitrary list of symbols
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<Bike> i don't understand how this works. in fbind-2, is (mapcar #'second bindings) evaluated when once-only-list-eval is macroexpanded?
<makomo> Bike: yes, indeed
<Bike> that can't be right
<makomo> the point is to reuse ONCE-ONLY, instead of having to write a function (or rely on the authors to do so) that will return me the expansion of ONCE-ONLY
<makomo> i don't see another way to do this
<Bike> BINDINGS doesn't even have a value at macroexpansion time
<makomo> Bike: what do you mean it doesn't have a value?
<makomo> ONCE-ONLY-LIST will expand into something that will evaluate that form
<Bike> so it's not evaluated when once-only list-eval is expanded. it's evaluated by its expansion.
<makomo> Bike: ah right, my bad
<makomo> but both of those are macroexpansion-time though, right?
<pjb> makomo: what does fbind do?
<Bike> no.
<Bike> i mean, macroexpansion is done at compile time.
<makomo> pjb: take a look at the example at the bottom
<makomo> pjb: allows you to use a function object without having to use FUNCALL
<makomo> i.e. just syntactic sugar
<makomo> Bike: erm, yeah, but the FBIND macro itself is also expanded at compile-time, and it contains the expansion of ONCE-ONLY-EVAL-LIST
<pjb> ok.
<makomo> so the evaluation is done at macroexpansion-time, but within FBIND
<Bike> i'm just going to look at the expansion
<makomo> the expansion of FBIND is pretty nice :D
<makomo> it's the same as phoe's from yesterday really
<makomo> except he redid what ONCE-ONLY does manually
<jackdaniel> did I got transferred one day into the past or it's just another iteration? :-)
<makomo> jackdaniel: :D
<makomo> hey, this stuff is great to think about
<makomo> double backquoting is becoming almost second nature
<Bike> i meant theexpansion of once-only-list-eval, which is again, scary
<jackdaniel> sure, enjoy. it was a funny impression though (semi-dejavu-like)
<makomo> jackdaniel: i can imagine :D
<makomo> Bike: yeah, true, it's non-trivial, but it's interesting to see the same patterns pop up when writing macros
<Bike> i feel like there's got to be a way to do this without eval
<pjb> makomo: what about my annotation: https://plaster.tymoon.eu/view/844#846 ?
<makomo> like forcing double evaluation, etc.
<Bike> since you don't even use the particular bindings, just the list of them
<makomo> you start to feel it
<Bike> yeah like pjb did.
<pjb> I have to confess, that I never use once-only and rarely with-gensyms…
<makomo> hm let me see
<makomo> right, but this is reinventing ONCE-ONLY
<makomo> that's the point of this whole thing, to avoid doing that
<makomo> what's the point of all this lisp goodness if i can't reuse macros with ease
<makomo> that's what bothers me the most
<pjb> Perhaps, but doing this I don't get lost into using eval in a macro…
<makomo> yeah, true, i agree
<makomo> i had to show that it can be done, and in multiple ways too
<makomo> but you see, i can't avoid EVAL
<Bike> you have a weird idea of 'ease', yo.
<makomo> is this really the curse we have to live with?
<makomo> heh
<Bike> once-only-list and once-only are kind of different things.
<pjb> makomo: perhaps you could use once-only. But the thing is that you must evaluate your expressions in the right macro. The parameters to a macro aren't evaluated by the called macro, so you need to compute them in the caller!
<makomo> pjb: pretty much, and that's the whole problem
<pjb> Hence the let that computes names, initforms, and funs in fbind, not in an once-only-list.
<makomo> pjb: that happens in my FBIND too, it's just that ONCE-ONLY-LIST expands into code that does that
<pjb> Well you could do that, but you don't need to evaluate the arguments.
<makomo> Bike: i guess so, but is there even a way to write a "list" version of ONCE-ONLY?
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<pjb> Expand to a `(once-only-list ,initform …) form.
<makomo> i don't think there is, since macros receive source code
<makomo> the stuff you wrote when you called ONCE-ONLY is what it receives, that's it
<makomo> there's no way around this problem really :^(
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<makomo> pjb: erm, where would you put that?
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<makomo> i wonder if meta-meta-programming would solve this issue
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<makomo> and even the macro-function version ends up using EVAL
<makomo> Bike: also, you would probably use ONCE-ONLY if you didn't have an arbitrary number of bindings
<makomo> because that's the point of ONCE-ONLY, to help you write macros and reduce boilerplate when writing them
<makomo> but as soon as the number of symbols isn't constant, you're out of luck
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<pjb> Again, I drop it, there's no need to implement something like once-only-list, or to use once-only. It only makes the macros more complicated than they should be.
<makomo> pjb: but ONCE-ONLY doesn't complicate anything by itself
<makomo> it makes writing macros easier if anything
<makomo> but only if you have a *constant number of forms* you want to evaluate
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<pjb> perhaps. On the other hand, I like to use different names for the expression and the variable bound to the expression. (let ((,vstuff ,stuff)) …) instead of (once-only (stuff) …).
<Bike> wow, and fbind itself expands into something easy to understand, despite its horrible upbringing
<Bike> that's spooky
<makomo> Bike: exactly, that's the most beautiful part
<Bike> but yes i don't usually use once-only either.
<makomo> pjb: ONCE-ONLY supports lists as specs too
<makomo> you can say (once-only ((hello stuff)) ...)
<makomo> whatever form is bound to STUFF within the macro is evaluated once within the expansion into a gensym, which is bound to HELLO within the macro
<pjb> In macros, it's important to keep separate the bindings in the different environments, or levels of backquotes. Once-only confuses things up, IMO.
<Bike> yeah.
<makomo> Bike: i'm looking at your annotation
<makomo> meh, idk, i don't feel like it's that confusing. it's just a thing that you get used to, just another "black box" if you will
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<makomo> ONCE-ONLY only confuses things because its docs are a bit crappy
<pjb> makomo: I can agree to the getting used to.
<makomo> it doesn't really say anything about INITFORMs
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<makomo> perhaps a PR for that wouldn't be bad
<makomo> Bike: does your solution work or?
<Bike> seems to.
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<makomo> Bike: err, but i don't think this ONCE-ONLY does anything?
<makomo> removing it changes nothing
<makomo> i think you just did it manually again using GENSYM yourself
<Xach> Friends, this day we will have a new Quicklisp dist update! I can feel it in my bones!
<Bike> you mean the alexandria:once-only in the once-only-list macro function?
<makomo> Bike: yes
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<makomo> hmm
<makomo> yeah, what does it even do?
<makomo> the argument INITFORMS within ONCE-ONLY-LIST is bound to the symbol INITFORMS
<Bike> it prevents multiple evaluation of the initforms form in the macro
<Bike> it doesn't matter in this particular case
<Bike> but you could try removing it, and then rewriting fbind to do (once-only-list (funs (mapcar #'second bindings)) ...),and then macroexpand it
<Bike> it'll do the mapcartwice
<Bike> mapcar twice
<Bike> i friggin hate writing code like this. i have to reverse engineer what i wrote thirty seconds after writing it because it doesn't stay in my head
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<makomo> Bike: ah you're right, but it doesn't have the same function as the ONCE-ONLY i used within my expansions
<makomo> this is only for the purposes of your own macro's hygiene, it has nothing to do with the ultimate goal, i.e. reusing ONCE-ONLY
<makomo> aren't you still doing it all manually
<makomo> yeah, pretty much reinvented ONCE-ONLY from what i can see
<makomo> Bike: yeah lol, it's not the easiest thing
<makomo> but once it is written, you can forget about it and use it like a black box, so who cares how complex it is underneath if it's well documented and does it job
<makomo> (until bugs pop in i guess :D)
<makomo> its*
<Bike> yes, i'm doing it "manually", because like i said, once-only and once-only-list are not the same thing.
<makomo> right, but they're pretty close in their functionality
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<makomo> one takes a list of a constant number of specs, the other takes an arbitrary number of specs
<makomo> that's it
<makomo> and yet that immediately requires you to use EVAL
<makomo> at macroexpansion-time, as we said
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<Bike> yeah, like (+ 3 4 5) is easy but (apply #'+ list) is different
<makomo> yeah, pretty much
<makomo> right, exactly that
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<makomo> but this whole problem is bigger than ONCE-ONLY
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<makomo> all macros have this "problem"
<_death> I think macros are for syntactic convenience and clarity, and this "re-use" inverts the purpose ;)
<makomo> i don't know, i feel like macros should be composable as well, just like functions
<makomo> otherwise you can't escape from constantly rewriting the same things over and over again, such as avoiding multiple evaluation
<makomo> (in the case of an arbitarary number of forms, that is; otherwise you just use ONCE-ONLY)
<Bike> this is the first time i have run into a situation even vaguely like this
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<_death> also, once-only rebinds the names passed to it.. in this situation I don't think you need that
<_death> that's why a simple solution using gensym + let works pretty well
<makomo> _death: right, but those disappear in the end anyway because nobody uses those rebound symbols
<makomo> Bike: definitely not the first time for me
<makomo> literally anything that you want to generalize to an arbitary number of arguments is screwed
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<_death> but you don't usually need to rebind the names.. so once-only isn't the exact fit
<makomo> hm, why not?
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<makomo> so in the end, the only solutions are (1) use the original macro and EVAL to make it work for an arbitrary number of arguments or (2) write two versions of the same macro
<makomo> but i guess the constant size version could just delegate to the list version?
<makomo> by quoting the thing to be evaluated
<makomo> and by "original macro" i mean the constant size version
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<_death> the fact that you call gensym by yourself already indicates an issue.. after all once-only is supposed to hide the use of gensyms
<makomo> _death: right, but this is only to generate dummy symbols for the ONCE-ONLY to use
<makomo> these are the symbols that then get rebound, but nobody cares about them anyway, because nobody knows their names and what initforms they correspond to
<makomo> we care about the gensyms made by ONCE-ONLY, those that are part of the expansion that ONCE-ONLY helped write
<makomo> that's what i bind to the list "oo"
<makomo> and also, this gensym creation thing is hidden away anyway
<makomo> this isn't something the user does, this is just to actually implement the list version of ONCE-ONLY
<makomo> take a look at FBIND for the usage
<makomo> no gensyms at all
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<makomo> and EVAL wouldn't even be a problem if i didn't have to explictily pass variables of the using macro to ONCE-ONLY-LIST so that they're available in the EVAL
<_death> if you look at your final fbind macro, it looks pretty similar to the fbind that uses a function that returns the gensyms and the bindings
<makomo> _death: do you have the FBIND version that uses a function? i don't have it
<makomo> or did i miss something
<_death> https://plaster.tymoon.eu/view/842 ;; remove the silly gensym->name that was there to make a point
<makomo> right, but i don't see how that's a bad thing. it's not something you can avoid either, since there's an arbitrary number of symbols you have to create
<makomo> they'll have to be gensyms
<_death> yes, but what does the macro give you that the function doesn't
<makomo> the fact that i don't have to write the prefix LET myself
<makomo> and the fact that i don't have to write such a function myself
<_death> just a gnarly macro ;)
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<makomo> the call to this function and then binding its results and using them to prefix my own macro with a LET
<makomo> that's what i want to avoid, and that's the job of ONCE-ONLY and ONCE-ONLY-LIST
<makomo> i don't want to do that every time
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<_death> and still you can have a once-only-list macro that doesn't use once-only and it should be much simpler
<makomo> right, true, and that's the one Bike wrote
<makomo> to me that seems like the best solution i think
<makomo> although it then requires that the author plan ahead for the arbitrary version right away, instead of the constant version
<makomo> and the constant version can then be derived from the arbitrary one, i think
<_death> only the name is confusing because the analogy isn't very good
<makomo> hmm. yeah, the arbitrary one evaluates at macroexpansion time so maybe that's why it appears to be different?
<makomo> but the essence is the same
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<auricle> hello fellows, I have not found a GLL parsing library for CL so I am going to translate one from this Racket GLL library: https://github.com/epsil/gll/blob/master/3/parser.rkt
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<makomo> _death: huh... i don't think the constant version can be written using the arbitrary version... without EVAL
<makomo> i'm not sure yet, i'll try
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<pjb> makomo: in scheme eval takes an environment argument (like macroexpand or the macro functions). This is what makes it actually rather useless! You don't usually have the environment you want to evaluate things…
<pjb> (and since scheme doesn't have dynamic bindings (by default), …)
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<Xach> auricle: What is GLL?
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<jkordani> looks like a cool article to me
<auricle> Xach: apparently it is like PEGs but without the left recursion constraint
<auricle> Xach: so one can finally just write literally the BNF grammar one wants without having to factor it at all, like a human being
<Xach> https://github.com/dimitri/cl-abnf is pretty cool in that regard
<auricle> Xach: that seems liek a beefed up regex library. I think GLLs are like beefed up PEGs (they can parse CFGs)
<Xach> "literally the bnf grammar" is what made me think of it
<auricle> Xach: by that I meant being able to write "expr -> expr + expr" whereas that would never work in most parsers... you'd need to factor it out; not so with GLLs
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<auricle> Xach: have you ever translated a library from scheme that I could use as a reference for all the tricky "..." (scheme's macro ellipses) etc?
<Xach> auricle: no, sorry.
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<auricle> Xach: in case you're interested there's apparently a so-called "Earley algorithm" that gives us PEGs with left-recursion. anyway, I'm out, have a good day, and thanks for all you do for CL
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<Xach> beach has sung earley's praises in that pst
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<didi> Is anyone aware of an expression language for defining dates? Like CL-PPCRE accepts a parse tree for defining regular expressions.
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