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Re: Interpretation of a space in regexp isearch?
From: |
Juri Linkov |
Subject: |
Re: Interpretation of a space in regexp isearch? |
Date: |
Sat, 01 Sep 2012 03:47:34 +0300 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.2.50 (x86_64-pc-linux-gnu) |
> No, ignoring whitespace differences entirely is not desireable.
> If the user searches for the word "tome" and isearch hits on "to me",
> that would be annoying.
It doesn't ignore empty whitespace differences because
`search-whitespace-regexp' matches non-empty strings
as a 1+ sequence of whitespace with "\\s-+". Of course,
changing it to "\\s-*" would be annoying.
But what I meant is that the current C implementation
of `search-spaces-regexp' can be converted to Lisp as:
(defun search-forward-ignore-whitespace (string &optional bound noerror count)
(re-search-forward (search-whitespace-regexp (regexp-quote string))
bound noerror count))
(defun search-whitespace-regexp (string)
(replace-regexp-in-string
" +"
search-whitespace-regexp
string nil t))
whereas it would be also very useful to have
(defun search-whitespace-regexp (string)
(replace-regexp-in-string
"\\s-+"
search-whitespace-regexp
string nil t))
that matches a non-empty sequence of whitespace, not just spaces.
So what I think is that this matching regexp could be configurable
with the default value " +".
> That's why I suggested the suffix -lax-space-match. Or, if that is too
> wordy, maybe -lax will do (there's already word-search-*-lax but I think
> that's OK since this feature doesn't overlap with word search). Or
> maybe -lazy-spaces. Or feel free to suggest something better.
The reason why I think that related function and variable names
should contain the word `whitespace' is because it will connect it
with the already existing `search-whitespace-regexp'.
OTOH, the suffix `-lax' is short and has no limited meaning,
so maybe it would be good to have names like:
(defcustom search-whitespace-regexp
(defvar isearch-whitespace-lax
(defun isearch-toggle-whitespace-lax
(defun search-forward-whitespace-lax
(defun search-backward-whitespace-lax
> The message for isearch-toggle-whitespace should not speak of "ignoring
> whitespace", for the same reason.
One message for `isearch-toggle-whitespace' was taken from the defcustom
definition of `search-whitespace-regexp' to display the same meaning as
"treat spaces literally". Another message to enable this feature
could display something more meaningful too like
"space matches a sequence of whitespace chars".
> I think the simplest, most backward compatible solution is simply to
> allow search-whitespace-regexp to take a cons cell value :-P
I meant that supporting lax whitespace in regexp mode makes functionality
more complicated because of adding special conditions in
`isearch-toggle-whitespace', `isearch-query-replace',
`isearch-occur', `isearch-search-fun-default'.
But configuring it with a cons cell makes it more complicated.
So the question was rather do we need to support lax whitespace
in regexp mode at all?
- Re: Interpretation of a space in regexp isearch?, (continued)
- Re: Interpretation of a space in regexp isearch?, Juri Linkov, 2012/08/29
- Re: Interpretation of a space in regexp isearch?, Chong Yidong, 2012/08/30
- Re: Interpretation of a space in regexp isearch?, Chong Yidong, 2012/08/30
- Re: Interpretation of a space in regexp isearch?, Juri Linkov, 2012/08/30
- Re: Interpretation of a space in regexp isearch?, Stefan Monnier, 2012/08/30
- Re: Interpretation of a space in regexp isearch?, Juri Linkov, 2012/08/30
- Re: Interpretation of a space in regexp isearch?, Juri Linkov, 2012/08/30
- Re: Interpretation of a space in regexp isearch?, Chong Yidong, 2012/08/31
- Re: Interpretation of a space in regexp isearch?, Juri Linkov, 2012/08/31
- Re: Interpretation of a space in regexp isearch?, Chong Yidong, 2012/08/31
- Re: Interpretation of a space in regexp isearch?,
Juri Linkov <=
- Re: Interpretation of a space in regexp isearch?, Chong Yidong, 2012/08/31
- Re: Interpretation of a space in regexp isearch?, Chong Yidong, 2012/08/29
- Re: Interpretation of a space in regexp isearch?, Juri Linkov, 2012/08/29
- Re: Interpretation of a space in regexp isearch?, Stefan Monnier, 2012/08/29
- Re: Interpretation of a space in regexp isearch?, Dani Moncayo, 2012/08/29
- Re: Interpretation of a space in regexp isearch?, Juri Linkov, 2012/08/29
- Re: Interpretation of a space in regexp isearch?, Juri Linkov, 2012/08/28
- Re: Interpretation of a space in regexp isearch?, Chong Yidong, 2012/08/29
- Re: Interpretation of a space in regexp isearch?, Juri Linkov, 2012/08/29
- Re: Interpretation of a space in regexp isearch?, Chong Yidong, 2012/08/30