[Proposal] add a lexical analyzer

[xjchengo]

When I add feature that variable resolve can be escaped, I found current shell analyzer is too simple and inconsistent with real shell. Maybe we can add a shell lexical analyzer into it.

[GrahamCampbell]

Sounds a bit overkill doesn't it?

[xjchengo]

Is there any existing package that can be used? There are pygments and shlex in Python Community.

[GrahamCampbell]

I'm not aware of anything, but that doesn't mean they don't exist. :)

[jbrooksuk]

I'm with Graham, it seems like a huge bunch of overhead for something that should be quite fast?

[vlucas]

I agree this is overkill for phpdotenv.