An online Zig compiler inspired by Go and Rust

Related tags

Miscellaneous zig
Overview

Zig Playground

This is a rudimentary online compiler for the Zig programming language. It is inspired by the Go playground.

Setup

The main server is a Go binary that serves up a single HTML page that allows you to enter your Zig code and then run it. To run it yourself, you will need a Go tool chain which can be installed via brew on a Mac. If you wish to run it locally, you must compile it for your GOOS and GOARCH but I have included a small shell script to make a Linux binary that Docker can use as well. You should also have Zig installed and accessible from within your $PATH on the host.

Hosting

In theory this could be run anywhere that a Docker container can execute. Google's Cloud Run may be a cheap option considering their generous free tier.

FAQ

What can this playground do?

It is currently set up to simply run a single Zig source file. (i.e. zig run source.zig)

Are there any timeouts?

If your code doesn't build within 10 seconds, the server will quit your request.

Why does the page look so bad?

I'm clearly more of a server-side programmer. Any styling changes are very much appreciated!

Why am I getting rate-limited?

You're allowed five compilations per minute which I think is fairly generous.

Is it secure?

Go read the source. I do not collect logs of any kind and am not interested in your data. Unless it is causing issues to the service.

Will this always be available?

To the best of my ability, I will try and keep this online. I may even buy a domain for it.

Contact

Feel free to email me at my listed address with any other questions or comments.

License

MIT

Comments
  • Improve UI slightly

    Improve UI slightly

    A few things:

    • Display result of compiling on the same page
    • Improve the look slightly
    • Add a favicon
    • Have a default example in the code box

    To do the first, it uses a little JavaScript to POST the text to the server, instead of submitting it as a form.

    I removed bootstrap and added a few of my own styles; let me know if there's parts you don't like. (As a bonus, removing bootstrap cuts out 98% of the page size! :) )

    opened by macarc 4
  • Compiler version is outdated

    Compiler version is outdated

    I tried running this program in the Zig playground, but it doesn't compile successfully. This might be due to an outdated version of the Zig compiler:

    const std = @import("std");
    
    // we make the interface very explicit here.
    // Might also be possible with less comptime parameters, but could be way more ugly then
    fn map(comptime Src: type, comptime Dst: type, comptime len: usize, array: [len]Src, function: fn(Src) Dst) [len]Dst {
        var result: [len]Dst = undefined;
        for (result) |*res ,index| {
            res.* = function(array[index]);
        }
        return result;
    }
    
    fn add(a: f64) f64 {
        return a + 1.0;
    }
    
    pub fn main() void {
        var array_thing = map(
            f64, // src type
            f64, // dst type
            3,   // array length
            .{1.0, 2.0,3.0},  // anonymous literal, can be coerced to array
            add, // the function
        );
        std.debug.print("Hello, {d}!", .{array_thing}); // prints "Hello, { 2, 3, 4 }!"
    }
    

    Will the Zig playground be automatically updated to use the latest compiler version, or does it still need to be updated manually?

    opened by jarble 3
  • Enhancement: Support zig fmt

    Enhancement: Support zig fmt

    Similar to Go Playground, I was wondering if we could possibly add an fmt option too in the zig-play. To format the user's source zig code in the textarea.

    Wanted to run it by you if it was feasible to handle sending the source code as a payload, formatting it, and then updating the source text area with the formatted code or displaying fmt warnings (if any) in the stdout box.

    Something along these lines:

    $ echo 'const std = @import("std"); pub fn main() void { std.debug.print("Hello, {s}!", .{"world"}); }' | zig fmt --stdin
    const std = @import("std");
    pub fn main() void {
        std.debug.print("Hello, {s}!", .{"world"});
    }
    
    opened by el10savio 2
  • Added Zig Fmt Support

    Added Zig Fmt Support

    Fixes: #10

    Now the playground includes a "Format" button to fun zig fmt on the user's source code similar to how we compile it. If the formatted code is different from the original code, it gets updated in the textarea. Likewise, If the code gets an error in fmt, the error message gets updated in stdout.

    A new route /server/fmt is added which is similar to /server/run takes in the source as payload converts it to a file and now runs zig fmt on it with the same constraints as zig run with size & time.

    It still has a few hiccups, like inadequate line number detection in the user's text area. Will try to improve on it in later PRs.

    opened by el10savio 1
  • Fix Placeholder Program Compile Error

    Fix Placeholder Program Compile Error

    Hi,

    Really nice work with https://zig-play.dev/ I visited the page and found out the default placeholder in the Source: text box does not compile. The following PR fixes this issue.

    Issue:

    For the current placeholder

    const std = @import("std"); pub fn main() void { std.debug.print("Hello, {}!", .{"world"}); }
    

    It fails to compile with the error in stdout

    An error occurred:
    /usr/local/bin/lib/std/fmt.zig:519:25: error: cannot format array ref without a specifier (i.e. {s} or {*})
                            @compileError("cannot format array ref without a specifier (i.e. {s} or {*})");
                            ^
    /usr/local/bin/lib/std/fmt.zig:352:23: note: called from here
            try formatType(
                          ^
    /usr/local/bin/lib/std/io/writer.zig:34:34: note: called from here
                return std.fmt.format(self, format, args);
                                     ^
    /usr/local/bin/lib/std/debug.zig:68:27: note: called from here
        nosuspend stderr.print(fmt, args) catch return;
                              ^
    /tmp/playground092885291/play.zig:1:65: note: called from here
    const std = @import("std"); pub fn main() void { std.debug.print("Hello, {}!", .{"world"}); }
                                                                    ^
    /tmp/playground092885291/play.zig:1:48: note: called from here
    const std = @import("std"); pub fn main() void { std.debug.print("Hello, {}!", .{"world"}); }
                                                   ^
    

    Adding the specifier now fixes this

    const std = @import("std"); pub fn main() void { std.debug.print("Hello, {s}!", .{"world"}); }
    
    opened by el10savio 1
  • Add hosting url to readme

    Add hosting url to readme

    Saw this on lobster, but it took me a minute to locate the link because I seldom look at the sidebar. Throw a link into the README so it is in the body.

    opened by dbready 1
  • Loading and saving programs from the playground

    Loading and saving programs from the playground

    There's currently no way to share links to programs in the Zig playground. But there should be a way to save a link to a program in a query string, like this:

    https://zig-play.dev/?source_code_goes_here

    I would use encodeURIComponent to convert the source code to a query string, and then use decodeURIcomponent to convert it back to source code.

    opened by jarble 3
  • The program isn't sufficiently isolated thus users can access files they probably shouldn't

    The program isn't sufficiently isolated thus users can access files they probably shouldn't

    If a user enters similar to the following they're capable of querying the system for

    const std = @import("std");
    
    pub fn main() void {
        std.debug.print("Hello, {}!", .{@embedFile("../../etc/profile")});
    }
    

    Along with being root

    const std = @import("std");
    
    pub fn main() !void {
        const result = try std.ChildProcess.exec(.{
            .allocator = std.heap.page_allocator,
            .argv = &[_][]const u8{ "sh", "-c", "whoami" },
        });
    
        std.log.err("{s}", .{result.stdout});
    }
    

    The program should probably be isolated using namespaces and under a different user such that it's not possible for it to see anything other than the stdlib files and dependencies.

    opened by tauoverpi 3
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