On Sunday, 23 June 2013 at 17:54:01 UTC, Andrei Alexandrescu
wrote:
Awesome!
I realized initializing the runtime might have been a mistake
when loading the .so and moreover I was using the wrong calling
convention. Fixed that and now the shared library thing works. On
Linux at least, I hardcoded ".so" so don't try it anywhere else.
Here's some code:
http://arsdnet.net/dcode/dhp.zip
unzip it, hit make. dhp2.d is the main file here, it also uses
some helper libraries you can see in the arsd folder.
Then run ./dhp2 in another window or something. It is a long
running process that serves http.
Head over to your browser and surf to
http://localhost:8085/
It will take a couple seconds to load the first time, because it
needs to compile the code. Subsequent loads will pull it from a
cache and be faster.
Anyway it will show you some stuff and a link. These pull from
the files in the zip called index.dhp and dhpt.dhp. index is just
html, no D code, although it will compile it since this server
compiles everything.
dhpt.dhp actually includes some D:
<p>Hello, <% cgi.write(cgi.request("name", "user")); %>,
happy to see you.</p>
Note: you access that by going to localhost:8085/dhpt, NOT
/dhpt.dhp. It strips out dots from the url as a way of sanitizing
the filename so keep it simple.
It uses ASP style <% %> tags instead of <?d ?> because my dom.d
already understands them. (BTW this parses the .dhp files to be
well-formed xml, so if you mismatch tags, it will throw. It might
be fun to put the DOM node in scope to inspect too).
There's a Cgi cgi in scope in the function it builds here. Use it
to do communication instead of writeln() etc., as seen in this
example.
Here's where the shared library magic comes in: feel free to edit
one of those .dhp files, or create your own, and go back to it in
the browser. It will recompile and present it to you without
having to restart the server. That's kinda cool. The downside is
if you segfault in here it will take the whole server down so
don't do that.
If you fail compiling though, it will actually read dmd's output
and translate the filename and line number to match the .dhp file
input, instead of the .d file dmd actually sees. So it feels less
like a filthy hack then.
Feel free to look at index.d and dhpt.d in that same folder after
you browse to them to see what the generated code looks like.
Soooo yeah. I'll probably never use this, dom templates rok so
much more than anything asp/php style, but if you wanna play,
feel free and let me know if you want more features or see bugs.
Probably won't be too hard to fix up now that it is started.
