On Feb 25, 11:24 pm, Joe Antoon <[email protected]> wrote:
> But if nobody has done this before, would any of the users be
> interested in supporting a plug-in system like the one I described
> above? There's only a single function that actually needs to be
> embedded in your application to use it, so extensions could be
> developed separate of each other.
i developed just such a system for the SpiderApe project (http://
SpiderApe.sf.net), which is a C++ toolkit for expanding SpiderMonkey.
i've recently all but abandoned SpiderMonkey because it's so poorly
documented and certain aspects of it are particularly painful without
good documentation. Since v8 seems to be the only really portable JS
engine out there, i'd like to focus future JS/C++ work on v8.
That said: if we can come to an agreement on what a plugin model might
need to look like, i could commit some time on this. i have previous
work off of which i could base it, assuming the proposed model is
either close to that code or people are willing to accept whatever i
code ;).
For SpiderMonkey i wrote ncurses and sqlite3 plugins, and they would
be loaded like this:
(JS code):
if( ! dll_load("SQLite3") ) { throw new Error(...); }
var db = sqlite3_open( "path/to/my.db" );
...
By default that would use some compile-time-determined library path to
find a DLL named PluginName.(platform-specific-extension). The DLL
loader was based off of the classloader model described here:
http://wanderinghorse.net/computing/papers/#classloading_cpp
and opening the DLL would use a callback mechanism to inject DLL-side
symbols (new JS functions and classes) into the JS context which
opened the DLL.
The lookup path for plugins could be changed by scripts with something
like:
dll_classpath_set( dll_classpath_get() + ":/home/me/lib/v8/
plugins" );
(a more OO approach is probably a good idea). The existing code (for
SpiderApe) has been extensively used on Unix platforms, but has also
been shown to run on Windows. Mac - no idea.
If this basic scenario sounds reasonable as a starting point, i
wouldn't mind trying to throw together a prototype.
:-?
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