Re: Selective font-locking?

[Stefan Monnier]

> Python-font-lock-keywords is a variable defined in ‘python.el’.
> Its value is
> (python-font-lock-keywords-level-1 python-font-lock-keywords-level-1 
> python-font-lock-keywords-level-2 
> python-font-lock-keywords-maximum-decoration)
>
> Not sure why jit-lock-function would be evaluating it like an sexp.

`python-font-lock-keywords` does not hold a valid value for use on
`font-lock-keywords` but a value to be used as the first element of
`font-lock-defaults`.  This "first element" is used to initialize
`font-lock-keywords` but it depends on things like the
`font-lock-maximum-decoration`.


        Stefan


>> On Apr 11, 2021, at 12:31 PM, Stefan Monnier <monnier@iro.umontreal.ca> 
>> wrote:
>> 
>>> But then, why bother round-tripping text out to a special-use buffer anyway,
>>> vs. just letting font-lock operate in-situ in the shell buffer itself using
>>> python-mode’s fairly simple font-lock-defaults. The only thing needed to
>>> make this work is asking font-lock to ignore all the text with ‘field of
>>> ‘output?  
>> 
>> Maybe you can try something like the following?
>> 
>>    (defvar python--font-lock-keywords ...)
>>    (defvar python-font-lock-keywords
>>      '(python--apply-font-lock))
>>    (defun python--apply-font-lock (limit)
>>      (while (< (point) limit)
>>        (let ((next-boundary (find-next-boundary limit)))
>>          (if (we-should-skip-this-block)
>>              (goto-char next-boundary)
>>            (let ((font-lock-keywords python--font-lock-keywords))
>>              (font-lock-ensure (point) limit))))))
>> 
>> 
>> -- Stefan
>>