Re: Why js2-mode in Emacs 23.2?

[Daniel Colascione]

On Aug 9, 2009, at 8:17 PM, Lennart Borgman wrote:
> Could not JIT-lock do a second pass?

> > Is there another way to solve the problem? Can mumamo tell espresso  
> > to
> > ignore certain parts of the buffer?
>
> Well, it does, but espresso kind of ignores that ... ;-)
>
> Just telling it where to scan will however not help since
> espresso-mode will be called every time a user enters a chunk with
> espresso-mode.

A second pass when? The problem is that functions that have nothing to  
do with fontification operate improperly unless correct text  
properties are attached to certain bits of the buffer.

Consider the regular expression /}/. syntactic-keywords are used to  
mark the whole expression as a string. If forward-sexp encounters that  
expression before the expression is marked as a string, then it'll  
interpret the '}' incorrectly. When the user actually enters a '}', we  
fontify it correctly. However, when we first start up, we need to  
fonyify the whole buffer so that we don't trip over
one of these regular expressions if we look at it before jit-lock gets  
around to it.

Can espresso just perform the regexp-marking scan 1) on only the  
region given to it by mumamo, and 2) only once, with some kind of  
indication given by mumamo of whether we're seen this particular chunk  
before?


> > As for define-derived-mode: nope, espresso-mode doesn't use that.
>
> It is a minor change but will help keeping it upto date later.

So just use define-derived-mode to inherit from fundamental-mode?