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crystal-lang/crystal

The Crystal programming language | http://crystal-lang.org | Fund Crystal's development: http://is.gd/X7PRtI | Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/

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Jan 28 21:02

Blacksmoke16 labeled #13025
Jan 28 21:02

Blacksmoke16 labeled #13025
Jan 28 21:02

Blacksmoke16 labeled #13024
Jan 28 21:02

Blacksmoke16 labeled #13024
Jan 28 18:45

asterite opened #13025
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meatball133 synchronize #13024
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meatball133 edited #13024
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meatball133 opened #13024
Jan 28 15:10

meatball133 ready_for_review #13008
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straight-shoota closed #13014
Jan 28 02:34

Blacksmoke16 labeled #13023
Jan 28 02:19

cyangle labeled #13023
Jan 28 02:19

cyangle opened #13023
Jan 28 00:41

devnote-dev labeled #13022
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devnote-dev opened #13022
Jan 27 23:05

straight-shoota labeled #13021
Jan 27 23:05

straight-shoota labeled #13021
Jan 27 23:05

straight-shoota labeled #13021
Jan 27 23:05

straight-shoota labeled #13021
Jan 27 23:05

straight-shoota opened #13021

George Dietrich

@Blacksmoke16

the type of literal hashes are inferred based on the values in the literal

but hashes with a lot of unioned types is kinda meh

From IRC (bridge bot)

@FromIRC

<Guest64> yea thats probably going to be messy since these procs vary in arguments from 0 to 6 with various types ranging from simply ints up to pointers to structs

<Guest64> although thats neat that works like that. ill keep that in mind

From IRC (bridge bot)

@FromIRC

<Guest64> @Blacksmoke16: I am having a bit of trouble implementing a simple test for your callable suggest: https://play.crystal-lang.org/#/r/biyo im probably not doing this right at all heh

George Dietrich

@Blacksmoke16

https://play.crystal-lang.org/#/r/biyq

prob not going to be that easy when you add more, as the compiler wont be able to guarantee that the value returned from the hash has that method with those arguments

From IRC (bridge bot)

@FromIRC

<Guest64> hmm yes, i will have to ponder about that. thanks for the assistance

George Dietrich

@Blacksmoke16

are the string keys anything significant?

Kirk Haines

@wyhaines

Yeah, it won't work once you add a second struct.

From IRC (bridge bot)

@FromIRC

<Guest64> the string keys are just a way to fetch the correct proc pointer from the hash to return to the dynamic linker. the dynamic linker actually gives me a char*, but i convert it to a string for use.

Kirk Haines

@wyhaines

I've been down this road when I built my #send implementation. :)

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@FromIRC

<Guest64> if it matters im attempting to implement rtld-audit for fun and experience: https://man7.org/linux/man-pages/man7/rtld-audit.7.html

George Dietrich

@Blacksmoke16

https://play.crystal-lang.org/#/r/biyx

From IRC (bridge bot)

@FromIRC

<Guest64> i have everything working, im just testing new theories and ways to generate code

George Dietrich

@Blacksmoke16

if the strings are just a way to know what the proc is, you can make the proc's class the key of the hash

could also ofc have a #get method that returns the related Callable instance that you could then directly invoke #call on

but i just combined them into 1 method

Kirk Haines

@wyhaines

Yeah. You can't get away from storing the class/type of Proc or Struct somewhere, in some form.

From IRC (bridge bot)

@FromIRC

<Guest64> random question: is there a way for crystal to expand macros in other files, then move the expanded code into another file for use? if that makes any sense.

<Guest64> for example: https://pastebin.com/rez9g1t2 vs https://pastebin.com/sAfrAy4M

From IRC (bridge bot)

@FromIRC

<Guest64> i wish there was better docs for macros somewhere. it seems to have all these cool features but i cant make heads or tails of them

George Dietrich

@Blacksmoke16

you already asked this and we answered it twice :P

:point_up: July 11, 2021 1:45 AM

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@FromIRC

<Guest64> ha, i suppose i did, my bad

George Dietrich

@Blacksmoke16

i will say that mutable constant approach is kinda a smell

im still of the opinion you dont even need a macro

From IRC (bridge bot)

@FromIRC

<Guest64> i guess the problem i am trying to solve is that i have all these function prototypes that vary radically, but the internal body consists mostly of the same method calls plus a bit of dynamic logic based on the function being called, hence the yeild in the macro. i think in the end i was just exploring different options so that i did not have to

<Guest64> write boilerplate 50+ times

Kirk Haines

@wyhaines

A macro generates code only in the location in which it is executed.

However.....you can make what you want to do work with macros.

Macros have access to constants.

So, if you generate all of your procs, assigned to a constant name, under a common namespace, then in your main.cr you can iterate over
that namespace (see Crystal::Maros::TypeNode in the Crystal API docs), find the names of all of your Proc constants, and build your master hash.

George Dietrich

@Blacksmoke16

i.e. in the previous example the logic that was like arg0 + arg1 is the stuff thats unique per proc? but there is also common logic between them all?

From IRC (bridge bot)

@FromIRC

<Guest64> yes corrent, a fair bit of common logic

<Guest64> im reading https://crystal-lang.org/api/1.0.0/Crystal/Macros/TypeNode.html atm like wyhaines suggested

Kirk Haines

@wyhaines

TypeNode just shows you what you have access to within a TypeNode. i.e. #constants, so you can iterate constants.

George Dietrich

@Blacksmoke16

https://play.crystal-lang.org/#/r/bizd

Kirk Haines

@wyhaines

The fact that macros have access to constants means that you can use them to store and gather information from a wide variety of locations, and use it in a central location.

George Dietrich

@Blacksmoke16

auto registers proc types in the collection type, and shows how you can do before/after logic

can remove the #register method then too

From IRC (bridge bot)

@FromIRC

<Guest64> wait i am a bit confised here. you can use {% %} and {{ }} outside of a macro def block?

George Dietrich

@Blacksmoke16

yes, this is also macro code

macro some_name are reusable portions of macro code, but you can also use the macro code outside of them

the end result is the same. Code generated by the macro code is included where it's called as if you manually typed it

From IRC (bridge bot)

@FromIRC

<Guest64> okay, that is pretty cool now, im starting to understand this system a bit more

<Guest64> thanks for the aid

George Dietrich

@Blacksmoke16

I'd also read https://crystal-lang.org/reference/conventions/coding_style.html

From IRC (bridge bot)

@FromIRC

<Guest64> wynhaines: just to circle back on what you said. if i define a proc with a constant such as MY_PROC = -> (){}, if i used {% Proc.constants %} I should be returned an array of all constants that contain a proc?

George Dietrich

@Blacksmoke16

From IRC (bridge bot)

@FromIRC

<Guest64> im just trying to understand the macros and typenode system as a whole now, outside of my project

George Dietrich

@Blacksmoke16

sec

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