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Re: moving in js
From: |
João Távora |
Subject: |
Re: moving in js |
Date: |
Fri, 10 Aug 2012 02:14:41 +0100 |
> Single words and symbols also are not balanced expressions IMO.
> When on ba|z
>
> (foo (bar ba|z) quux)
>
> C-M-b would reach |baz
>
> (foo (bar |baz) quux)
>
> i.e, it would do backward-word
No, it's doing backward-sexp. "baz" happens to also be a sexp (an
atomic), and it's not a question of opinion (see below).
> a repeat would do backward-word again, a third would error
>
> Can't see any relation to stipulated move over balanced expression here.
>
> Looks fairly arbitrary.
It's not. In lisp-mode, where this is clearer (but as we have seen it
can and has been generalized to other programming modes), a word and a
symbol are also sexp's. See http://en.wikipedia.org/wiki/S-expression:
a sexp can be an atom or a list ( a . b ) where a and b are themselves
sexp's. As you have found, backward-word doesn't error, because it
doesn't care about sexp's. But backward-sexp does :-) , indeed it
*must* error to tell you there are no more sexp's backwards at that
level.
IMO this is one of the best designed features in Emacs, and one many
non-Emacs users envy. When I move and delete with the C-M-* keys, I
get structured editing for free. And (shameless plug) if I add
autopair.el to that, I don't need paredit.el at all. Furthermore,
because Emacs generalizes the sexp concept to other modes via
syntax-tables, structured editing (and autopair) "just work" in
almost every programming mode that defines delimiters.
> CC to help, as it might be of some interest for others to.
of course, I forgot to send my previous message to the list.
--
João Távora
- moving in js, Andreas Röhler, 2012/08/07
- Re: moving in js, Peter Dyballa, 2012/08/07
- Re: moving in js, Andreas Röhler, 2012/08/08
- Re: moving in js, João Távora, 2012/08/08
- Re: moving in js, Andreas Röhler, 2012/08/09
- Message not available
- Re: moving in js, Andreas Röhler, 2012/08/09
- Message not available
- Re: moving in js, Andreas Röhler, 2012/08/09
- Re: moving in js,
João Távora <=
- Re: moving in js, Andreas Röhler, 2012/08/10
- Message not available
- Re: moving in js, Andreas Röhler, 2012/08/10