[wtp-dev] new parser@master

["Gorkem Ercan" <gorkem.ercan@xxxxxxxxx>]

The esprima based parser has landed to master. I would like to give a 
quick update on the current state.

At this time the old parser is still in place and the Javascript 
validator is still using the old parser.
We will switch to the new parser along with a change to move to using 
WTP validators[1]. However the
type inference and indexing of the old parser has been disabled so JSDT 
should no longer be causing OOM errors.
Unfortunately, missing inference causes code assist, search, and some 
related functions to stop working.
Fixes/replacements for some of those are already waiting for reviews but 
we will probably not restore all of them.

I have hooked some of the editor features to the new parser for example 
outline view is using AST generated
by new Parser and supports ES6 class and imports.

Unfortunately, the only way to introduce nashorn to run the esprima 
parser was to use ClassLoader Hooks[2]. At this
time working with them is a bit cumbersome and I have some ideas on how 
to improve it.

To work with the new parser
1. Import the nashorn related bundles from nashorn/ directory. You need 
to import these two bundles to your workspace for now
2. Due to the fact that Equinox needs any framework extension co-located 
with the OSGi framework bundle you need to also import org.eclipse.osgi 
into your workspace (from the Plug-Ins view's context menu select Import 
As → Source Project).
3. Add 
-Dosgi.framework.extensions=org.eclipse.wst.jsdt.nashorn.extension to 
your config.ini or launch configuration


[1] https://bugs.eclipse.org/bugs/show_bug.cgi?id=482841
[2] https://wiki.eclipse.org/Adaptor_Hooks

Thanks,
—
Gorkem