Re: Upcoming loss of usability of Emacs source files and Emacs.

[Dmitry Gutov]

On 06/30/2015 05:37 PM, Paul Eggert wrote:

> I thought that font-lock couldn't use the same escape syntax that
> substitute-command-keys does, and that this was why you suggested \~
> rather than \= -- i.e., so that one could use \= to escape characters
> that substitute-command-keys would otherwise interpret, and use \~ to
> escape characters that font-lock would otherwise interpret.

Yes. That was while before you asked to only consider paired quotes, and 
I hoped to avoid text property lookups in help--translate-quotes. It 
looks up `help-tilde-escaped' now.

> It would be better to use the one escape syntax, as it's one less thing
> to explain to Emacs users.  But how would it work?  I don't see how.

substitute-command-keys will add a `quoted' (or `escaped'? I'm fuzzy on 
the difference) text property to the characters that were escaped in its 
input. Thus translating "\\=`'" to #("`'" 0 1 (escaped t)) (if we're 
still using "\\=" there).

Then help--translate-quotes will check that property, instead of 
`help-tilde-escaped'.