Current progress on a PEG parser: https://www.refheap.com/107514

That's an example of a grammar to match JSON ^

Compiles to an instruction set for pattern matching

Based on a little mashup of Lua's LPEG library (which has an amazing paper to go along with it) and Scala's Parboiled2 library

TODO: write the VM, write the capturing code, and implement the AST optimizations in the LPEG paper

Have no idea how fast it will be, but if it is 2x slower than a handwritten parser like Jackson I'll be thrilled

Is there a get like function which will return the map entry in a map, not just the value?

danielcompton: clojure.core/find

perfect

(inc arrdem)

the thought is appreciated

@ghadi: Looks awesome. That LPEG paper is really nice, as is the lib.

I’m using PEG parsers in Cursive for macro parsing too, although just at the lexeme level, not chars

Ah, cool.

Using a lib for PEG in Cursive?

I’m using parser combinators, but compiling to a VM would be nice too.

I'm trying to figure out the appropriate API for the stack of captures

No, using combinators it’s around a page of code

Ok, my capturing stuff is pretty ghetto. I need to go back and read the paper again.

I’m going to be adding error recovery soon too, so I can mark syntax errors in the editor.

which paper, the Hutton one?

The one I was thinking of was Medeiros/Ierusalimschy

http://www.cs.tufts.edu/~nr/cs257/archive/roberto-ierusalimschy/lpegcompiler.pdf

Is there another one I should be reading? It’s been a while since I read all the PEG lit

Oh, yeah it's an amazing paper...

that one is less accessible to me than this article by Ierusalimschy http://www.inf.puc-rio.br/~roberto/docs/peg.pdf

Nice, I hadn’t seen that, thanks. I’m planning to work on the error recovery stuff soon so I can return partial matches with error info (important during editing since the AST is usually broken).

you seen cgrand's talk from the first conj?

No, I haven’t - was that about seqex?

heh, second conj. https://www.youtube.com/watch?v=LtTsJkVLBqI

Nice, I’ll have to watch that. What I ended up with is similar to the Illuminated Macros talk by chouser and Jonathan Claggett

Which is also well worth a watch if you haven’t seen it.

cfleming: nice. Second reference to Illuminated macros I've received tonight

I was there for it but didn't remember it so much about parsing

Is there something like rails’ asset pipeline for clojure, that will smudge all css into one, all js into one, maybe do image spriting?

@pupeno: https://github.com/magnars/optimus might be of interest

@magnars: oh… as a ring middleware. Interesting.

yeah, the idea is that assets needs to be first-class, so that you can write middlewares to transform them

@pupeno: @magnars I also use that one, works good for me

Let’s say there’s a record that exists like: (defrecord User [id]). What’s the difference between instantiating it with ->User vs. User. ?

kushalp: the result is the same. ->User is a clojure function bound to a var while User. invokes the java constructor of the corresponding class User.

kushalp: in general I would go with ->User because you can do all things to this var/fn you can do with every other function, e.g. trace in cider, add/extract metadata etc.

@ordnungswidrig: thanks for the clear explanation

anyone using spark with clojure? what is your experience?

anyone using counterclockwise for clojure dev? since upgrading i can’t seem to launch a headless repl for my project or even for a default leiningen project

getting various java heap space errors

clojure.lang.Compiler$CompilerException: java.lang.OutOfMemoryError: Java heap space, compiling:(deps/cljfmt/v0v1v10/deps/rewrite_clj/v0v4v12/rewrite_clj/potemkin.clj:59:18)

@sp3n: never had such issue. Usually, when something goes wrong with Eclipse, I swich workspaces, then come back

hey @val_waeselynck thanks for the reply - i hadn’t had this issue before either, only since i updated

what do you mean by switch workspaces?

ah wait i found the setting

i think i was using the old ccw-settings from my previous version which was screwing with things

thanks for leading me to switch workspaces - seems to be all working again now

yeah, although I love CCW (especially the structural editing and the REPL) you definitely want to get used to the usual crash

wondering how many ppl miss proper clj support in atom? would be pretty easy to do an integration with cider-nrepl and/or refactor-nrepl for atom but not sure if it worths the effort...

@benedek: someone started working on an ClojureScript editor for Atom : https://github.com/darwin/plastic

thx @jeluard for info. will check it out

it is not useable at this point, if this experiment proves itself, it will be clojurescript first, clojure second

give it few more years

@darwin do you have more details about what you are planning to implement?

this is my one-month old brain dump, at that time, plastic was a fork of LightTable, later I started over as Atom package https://gist.github.com/darwin/d8fc8556e6fbdc7dee11

not very specific, just some thoughts, I’m not a big planner, we’ll see how far I can get

Kinda curious: anyone here has been using Atom for Clojure development?

@viniciushana: Yep, am wavering between that and lighttable at the moment.

Interesting, how do you solve navigating through references? I think that’s the main point I stick with Cursive

In this gist, how come foo is unbound within the inner function applied by the map? https://gist.github.com/cddr/e8a800cd8d416f5d71d7

@cddr: First guess is that map is lazy. So the mapping fn isn’t actually invoked within the binding form.

Ah that's it! Wrapping doall round it makes it work

Thanks

No Prob

Does anyone know how to change the text in the REPL prompt in Emacs Cider? When I have a long nested space, it takes a lot of the screen width... So, instead of something.something.something.myns> i would like it to just display the last part, myns>

@blueberry I think you can define your own function and set it as the value cider-repl-prompt-function

"set it as the value of ..." I meant

@potetm: Thank you! I managed to get a better fix on this by using lightable and in my clojurescript code ended up having to use for, though.

@pupino https://github.com/AvisoNovate/twixt