jhass / carc.in Goto Github PK

I'm trying to run this example to test the network performance (because in my computer it seems to be a little slow on IO#gets method) but it seems to be impossible to share the result on carc.in, am I right?

https://carc.in/#/r/16wj

This is based on Crystal's examples of tcp server/client.

I assume this is just a limitation with highlight.js since it supports Ruby but not Crystal, but I figured I'd open an issue here in case you can think of another workaround for it.

From a quick google search, it seems like the Prism library supports Crystal highlighting, but I haven't tried it.

Here is a random example of what I'm talking about: https://carc.in/#/r/ab4n

When I try to run this crystal code:

io = IO::Memory.new

IO::ByteFormat::LittleEndian.encode(5, io)

puts io

In Brave, it sends me back to the homepage with an empty field. In firefox and safari, it sends me back to the main page with the original code still in.

Using latest browsers on macOS Catalina compiling crystal 0.32.1

Hi @jhass !

I think would be nice to have a favicon on https://play.crystal-lang.org/#/cr and https://carc.in/#/cr WDYT?

The source code renders directly to the DOM without filtering, which leads to a possible XSS attack vector via forged documents.

POC - Corrupted image which fails to load directly executes some stored JavaScript code.

Even if the online compiler doesn't contain user information one could still use the available attack vector for something malicious.

For testing purposes this list can be used, 90% of it will work since the DOM is rendered directly.

Cheers.

With Crystal 0.30.0+, a compilation error only shows the last frame, e.g:

Showing last frame. Use --error-trace for full trace.

In /usr/lib/crystal/json/from_json.cr:136:13

 136 | yield T.new(pull)
               ^--
Error: wrong number of arguments for 'M.new' (given 1, expected 0)

Overloads are:
 - Reference.new()

When the full error trace would be:

In some_file.cr:31:5

 31 | p Q.from_json(json_queue)
          ^--------
Error: instantiating 'Array(M).class#from_json(String)'


In /usr/local/Cellar/crystal/0.30.1/src/json/from_json.cr:13:3

 13 | new parser
      ^--
Error: instantiating 'new(JSON::PullParser)'


In /usr/local/Cellar/crystal/0.30.1/src/json/from_json.cr:128:3

 128 | new(pull) do |element|
       ^--
Error: instantiating 'new(JSON::PullParser)'


In /usr/local/Cellar/crystal/0.30.1/src/json/from_json.cr:135:8

 135 | pull.read_array do
            ^---------
Error: instantiating 'JSON::PullParser#read_array()'


In /usr/local/Cellar/crystal/0.30.1/src/json/from_json.cr:135:8

 135 | pull.read_array do
            ^---------
Error: instantiating 'JSON::PullParser#read_array()'


In /usr/local/Cellar/crystal/0.30.1/src/json/from_json.cr:136:13

 136 | yield T.new(pull)
               ^--
Error: wrong number of arguments for 'M.new' (given 1, expected 0)

Overloads are:
 - Reference.new()

Which provides much more intel on the actual error.

I think it would be nice to have a download code link.
It will allow to use carc.in for sharing code in a gist manner.

Thoughts?

It would be nice if you could run code with the nightly build of the Crystal compiler.

With the new CI setup there are nightly builds of Crystal master available. Currently it seems the only feasible way to access them is using the docker tag crystal:nightly, though.

I don't know how hard it would be to integrate into the sandbox system.

Currently when you use Crystal, Ruby or C in carc.in, pressing tab gives you an actual tab.
But in Crystal and Ruby you indent with 2 spaces so pressing tab should probably give 2 spaces in Crystal and Ruby and just give a real tab in C.

When carc.in is given the code

puts "<something />"

the run output is accurately

<something />

but the code preview shows

puts ""

If the tag is expanded and given contents, like

puts "<something>something</something>"

the run output is still accurate, but the code preview only shows the contents:

puts "something"

(Migrated from crystal-lang/crystal#1739)

http://carc.in/#/r/j0g

There was no output.

Of course there was no output. The compiler crashed!

Basically, it would be great to print info like the return code of the program that ran (like Ideone does) and messages like "Segmentation fault" if a program segfaults.

I added Crystal language definition to highlight.js. highlightjs/highlight.js#921

If highlight.js v8.8.0 is released, you should update highlight.js and fix it

Carc.in can run code in Crystal, Ruby and C languages, but the downloaded file always has .cr extension.

When you have a link to a compiled code example, like https://play.crystal-lang.org/#/r/157a, you can view the code when you use Chrome or Safari on OSX. When pasting this in to FireFox (47.0.1) there is a redirect back to the main page https://play.crystal-lang.org/#/crystal

It looks like a 502 error is being thrown as shown in the screen shot. The error pages shown are Nginx error pages.

Running OSX (10.11.6) FireFox (47.0.1)

I'm OK with Crystal and C. I'd be fine you add C++, Clojure, Clang, Coffescript, C# and Ceylon. But Ruby... it somehow feels out of place.

I added. Could you update codemirror and use Crystal mode?

https://codemirror.net/mode/crystal/index.html