Re: antlr-mode.el - need some support by python.el

[Dmitry Gutov]

On 02/18/2015 07:48 AM, Stefan Monnier wrote:

> Narrowing sucks, so no it's not a viable alternative.

Do you suppose the submodes will implement prog-indentation-context 
support using something other than narrowing? It's a powerful approach.

> > LEFTMOST-COL, likewise, can by added by the calling function.  No need to
> > make the submode's indentation function be aware of it.
>
> Yes and no: currently, the standard API to indentation is just
> indent-line-function which performs the indentation directly, rather
> than returning an indentation column.  So implementing LEFTMOST-COL
> "outside" means re-indenting after you called the indentation function.

I think I'd rather change the indent-line-function API, to return the 
column offset. Or add a new one, like `line-indentation-function'.

> Furthermore, I can imagine some cases where the inner mode may still
> want to indent to a column smaller than LEFTMOST-COL for good reasons.

I wonder what that is. But anyway, line-indentation-function would 
return a negative value in that case.