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/

George Dietrich

@Blacksmoke16

there are no specific scope overloads

other option would be to use a decorator

mfiano

@mjfiano:matrix.org

[m]

Perhaps my concerns are nothing, but I am hesitant to do such a thing, if the library I am writing is to be used with third party code expecting different behavior for =~ of 2 floats.

I don't know how the language behaves in this regard

George Dietrich

@Blacksmoke16

would be better off defining a new method in such case

mfiano

@mjfiano:matrix.org

[m]

Fair enough. Should I subclass the builtin float type and use that everywhere in my domain, or is there a more idiomatic approach?

George Dietrich

@Blacksmoke16

a decorator type is usually the better way to go afaik

mfiano

@mjfiano:matrix.org

[m]

I'll look that up

Thanks

Do you mean defining an annotation?

George Dietrich

@Blacksmoke16

more like something like

struct FloatWrapper
  @value : Float64

  forward_missing_to @value

  def initialize(@value : Float64); end

  def special_method
  end
end

mfiano

@mjfiano:matrix.org

[m]

Hmm, I don't really understand how that is delegating, but I'll study that code some. Thanks

George Dietrich

@Blacksmoke16

https://crystal-lang.org/api/master/Object.html#forward_missing_to(delegate)-macro

mfiano

@mjfiano:matrix.org

[m]

Yeah that was my first stop. Just trying to figure out how this is different than inheritance. The docstring/example could be better imo

Taupiqueur

@alexherbo2

@Blacksmoke16 what is the % in the macro?

George Dietrich

@Blacksmoke16

hm?

Taupiqueur

@alexherbo2

%v1

George Dietrich

@Blacksmoke16

https://crystal-lang.org/reference/syntax_and_semantics/macros/fresh_variables.html

Taupiqueur

@alexherbo2

it looks to work without the %

Rishav Sharan

@rishavs

How would one go about converting a hex string to normal string?

Taupiqueur

@alexherbo2

https://github.com/alexherbo2/walk.cr/blob/master/src/walk/down/filter.cr#L8-L14

George Dietrich

@Blacksmoke16

what do you mean by "normal string"?

a hex string is just a string of hex characters

Taupiqueur

@alexherbo2

so I should replace my value with %value to avoid side effects?

George Dietrich

@Blacksmoke16

@alexherbo2 idt it would matter

that's not what fresh vars are for

Rishav Sharan

@rishavs

I am trying to convert a hexstring to base64. I am assuming that i need to first convert the hex to slice and then to base64

George Dietrich

@Blacksmoke16

hexstring.hexbytes

Rishav Sharan

@rishavs

Thanks :heart:

mfiano

@mjfiano:matrix.org

[m]

Is there a shorthand form for when you have the same type restriction for adjacent parameters, to make something like (a : Float64, b : Float64, c : Float64, d : Float64) more concise?

oprypin

@oprypin:matrix.org

[m]

mfiano: no

mfiano

@mjfiano:matrix.org

[m]

Ok, thanks

mfiano

@mjfiano:matrix.org

[m]

# src/origin/common.cr

require "math"

module Origin
  def foo(x, y, rel_tol, abs_tol)
    (x - y).abs <= Math.max(abs_tol, rel_tol * Math.max(x.abs, y.abs))
  end
end

# src/origin.cr

require "./origin/*"

Origin.foo 1.2, 3.4, 1e-7, 1e-7 # Error: undefined method 'foo' for Origin:Module

Can someone tell me what I am doing wrong here?

oprypin

@oprypin:matrix.org

[m]

mfiano: u defined an instance method but there's no instance involved

class A
include Origin
end

A.new.foo

but you probably want to just define a class/module method by writing def self.foo

mfiano

@mjfiano:matrix.org

[m]

Oh I see.

Yes, I think I just want self.foo here

Rishav Sharan

@rishavs

How should I go about converting this weird string into a normal one?

pub_key_cert = pub_key_certs[jwt_header["kid"]] # => "-----BEGIN CERTIFICATE-----\n" +
"MIIDJjCCAg6gAwIBAgIIPLhThxCpHiEwDQYJKoZIhvcNAQEFBQAwNjE0MDIGA1UE\n" +
"AxMrZmVkZXJhdGVkLXNpZ25vbi5zeXN0ZW0uZ3NlcnZpY2VhY2NvdW50LmNvbTAe\n" +
"Fw0yMTA3MTQwNDMwMDBaFw0yMTA3MzAxNjQ1MDBaMDYxNDAyBgNVBAMTK2ZlZGVy\n" +
"YXRlZC1zaWdub24uc3lzdGVtLmdzZXJ2aWNlYWNjb3VudC5jb20wggEiMA0GCSqG\n" +
"SIb3DQEBAQUAA4IBDwAwggEKAoIBAQCdA8H9aoYbXymMZIUZDBEtxmRxGiMcfB43\n" +
"buZXWhM154faq6rk29aJssSF6K6RU/rSddwY2mQ/89rJxhqER+8CckYtf8ixwYA4\n" +
"nrtZYWzgzzBccfqDaZOdqVwBiCak3VAMxWDPg1xYhJc1NH7wVl9aAU3gsNmArh/T\n" +
"Bc5omWH8HOH6mU8slBRfJjuZlMRWwfxffCDZ+9XQfGP8e52OAWVg90OuLU6Li8jT\n" +
"CIpXickJFn4g0fc4i8+X7TlZWNn5dNJd02Ms3Hfk0zY2lyuv1Wlnxd6DumvTCNqa\n" +
"p3/TvF8QB20XGw3oDLoRzPeTSidA/7pItEIYuswDGJ/OKK+aZp8JAgMBAAGjODA2\n" +
"MAwGA1UdEwEB/wQCMAAwDgYDVR0PAQH/BAQDAgeAMBYGA1UdJQEB/wQMMAoGCCsG\n" +
"AQUFBwMCMA0GCSqGSIb3DQEBBQUAA4IBAQCaCB/WTMa79FgyczlwRtWYCH2GWJC7\n" +
"vIunI2dh3yZbzT1NBiDHx2Epp+nyz0sx1cN5s1HEsXFFTVtLa6vFl1p+O6SR/Hck\n" +
"Uj2waSiEmSXEJupzqKYXzyqgU+SE0TaaNAU9VvrSLI0HlMcSY2OReLcBgpvs8C7j\n" +
"zXyBmmlrMlUokvYE5h4Rui6JH9MahtcWARXkIPH5JwXVeXKPPie30NlqmifFPFTQ\n" +
"D3CCTbzYfk8kS4jgM5+DkYCJse3iDh4Wtfm4RuZKZ6IzgqgQr+JFkCatJcSlpgwC\n" +
"iPWtLgKNsmGDiU9Pj7KXRV5rXVygX3/Eb5m5Rug+UhXd1c3QlIlW1EF6\n" +
"-----END CERTIFICATE-----\n"

Do i need to reencode it somehow?

From IRC (bridge bot)

@FromIRC

<raz> hmm, is there a way to make from_json (JSON::Serializable) invoke my setters when populating the object

Ali Naqvi

@naqvis

converter is what you are looking for

@[JSON::Field(key: "foo", converter: FooConverter)]
.......

oops, that was not your question :)

From IRC (bridge bot)

@FromIRC

<raz> hmm right, but close :⁠)

<raz> i guess what i'm really trying to ask: is there a way to add something to the constructors that JSON::Serializable generates (short of making a custom converter for every field 🙈)

<raz> i have this really nice and rather relevant logic in my settings, but serializable doesn't care to invoke them when populating the object from json :,(

<raz> s/settings/setters/

Ali Naqvi

@naqvis

macro populate the fields, it would have been better if it would have invoked setters (if any) and fall-back to current behavior

in that way, one could just define the setters for fields which require some extra processing

Where communities thrive

People

Repo info

Activity