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Re: query-replace-interactive not documented
From: |
David Kastrup |
Subject: |
Re: query-replace-interactive not documented |
Date: |
20 Jun 2004 23:05:25 +0200 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.3.50 |
Richard Stallman <address@hidden> writes:
> Wel, optional spaces in the middle of regexp are something that
> needs extra explaining....Actually, I can't think about much
> except symbols here, and maybe forms like 'symbol which end up as
> a list.
>
> I think that is simple enough to explain.
>
> It does feel somewhat strange that the replacement expression
> x + \,(1+ \#) + y;
> would swallow a space,
>
> It would not swallow a space; the reader would stop after the
> close paren.
So what is the rule? The problem is that currently I just use
read-from-string, and that can't distinguish between
'symbol
and
(quote symbol)
even though it sounds as though both should be treated differently.
> Have you taken a look at the DOC-string of the currently checked-in
> version of query-replace-regexp?
>
> No. Did you check something in that doesn't agree with what
> I've said?
You are quoting it.
> These two paragraphs of doc string
>
> When this function is called interactively, the replacement text
> can also contain `\\,' followed by a Lisp expression. The escaped
> shorthands for `query-replace-regexp-eval' are also valid
> here: within the Lisp expression, you can use `\\&' for the whole
> match string, `\\N' for partial matches, `\\#&' and `\\#N' for
> the respective numeric values, and `\\#' for `replace-count'.
>
> If your Lisp expression is an identifier and the next
> letter in the replacement string would be interpreted as part of it,
> you can wrap it with an expression like `\\,(or \\#)'. Incidentally,
> for this particular case you may also enter `\\#' in the replacement
> text directly.
>
> would be clearer as follows:
>
> When this function is called interactively, the replacement text
> can also contain `\\,' followed by a Lisp expression. Each
> replacement evaluates that expression to compute the replacement
> string. In the expression, you can use `\\&' for the whole
> match string, `\\N' for partial matches, and `\\#' for the
> sequence number (origin-zero) of this replacement.
>
> If the replacement expression is a symbol, write a space after it
> to terminate it.
That's cheating. It does not tell that this space will actually get
gobbled and won't appear in the replacement. It does not tell just
_when_ such spaces will get gobbled. It does not tell how many of
them might get gobbled. So it is too easy.
I don't think you can do this much shorter than:
If the replacement expression is a symbol, then it may be followed
by one optional space that won't appear in the actual replacement.
> I left out the part about `\\#&' and `\\#N' because I don't
> understand what they do. I am not sure what "respective numeric
> values" means. When I tried \#&, it seemed to insert the
> replacement count followed by an &.
Not _within_ a Lisp expression, namely something like
\,(format "%d %d" \#& \#2). And if you had a match like
\([0-9]+\), then you can do arithmetic on it with something like
\,(1+ \#1).
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
- Re: query-replace-interactive not documented, (continued)
- Re: query-replace-interactive not documented, Juri Linkov, 2004/06/18
- Re: query-replace-interactive not documented, David Kastrup, 2004/06/18
- Re: query-replace-interactive not documented, Juri Linkov, 2004/06/16
- Re: query-replace-interactive not documented, David Kastrup, 2004/06/16
- Re: query-replace-interactive not documented, David Kastrup, 2004/06/16
- Re: query-replace-interactive not documented, Richard Stallman, 2004/06/17
- Re: query-replace-interactive not documented, Juri Linkov, 2004/06/18
- Re: query-replace-interactive not documented, Richard Stallman, 2004/06/18
- Re: query-replace-interactive not documented, David Kastrup, 2004/06/19
- Re: query-replace-interactive not documented, Richard Stallman, 2004/06/20
- Re: query-replace-interactive not documented,
David Kastrup <=
- Re: query-replace-interactive not documented, Richard Stallman, 2004/06/21
- Re: query-replace-interactive not documented, David Kastrup, 2004/06/21
- Re: query-replace-interactive not documented, Richard Stallman, 2004/06/22
- Re: query-replace-interactive not documented, Juri Linkov, 2004/06/25
- Re: query-replace-interactive not documented, David Kastrup, 2004/06/26
- Re: query-replace-interactive not documented, Juri Linkov, 2004/06/26
- Re: query-replace-interactive not documented, Richard Stallman, 2004/06/27
- Re: query-replace-interactive not documented, Richard Stallman, 2004/06/21
- Re: query-replace-interactive not documented, David Kastrup, 2004/06/21
- Re: query-replace-interactive not documented, Richard Stallman, 2004/06/22