Eli Barzilay wrote at 08/16/2011 02:20 PM:
Isn't this just a JS-based editor?
CodeMirror a rather nice JS-based text editor for programming languages, as JS-based text editors for programming languages go, and includes a Scheme language mode.
Danny Yoo has used CodeMirror in the implementation of WeScheme.
As for interactive examples, that would be "easy" with a sandbox. The usual caveats are that it won't be able to show off functionality related to FS operations, FFI, GUI, and probably a few more.
Well, if you wanted to support FS operations and FFI, and you have a spare server with the virtualization helper CPU instructions, setting up a KVM VM per session is doable for moderate traffic. (New Linux VM per user session; COW disks; pipe each session to a Racket process in the respective VM; have a fresh VM loaded in the chamber for the next new session) I'd be willing to bang out a couple Racket libraries to control the virtualization, if someone really wanted this.
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