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Re: Unmentioned "stringify" aspect in docu buffer-substring-no-propertie

From: David Kastrup
Subject: Re: Unmentioned "stringify" aspect in docu buffer-substring-no-properties
Date: Thu, 22 Jun 2006 22:28:14 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

Andreas Roehler <address@hidden> writes:

> Richard Stallman schrieb:
>> Would people please check those files for accuracy one more time?
>> They are the files listed in FOR-RELEASE with just one name.
>> text.texi
> IMO:
> Unmentioned "stringify" aspect in
> `buffer-substring-no-properties'; also concerns
> `buffer-substring'
> AFAIU there are two different meanings of string, which
> are mixed up in naming and function of
> `buffer-substring-no-properties':
> 1) it takes a portion of the buffer, but not necessary
>  of a type `string', so `substring' might mislead
>  here (nonetheless, would not ask for changing this
>  name for compatiblity reasons)

Uh what?  Of course the type is `string'.

> 2) it stringifies these portion, changes the type of it

It does nothing of the sort.

> ;;; check the following examples in a buffer starting
>   with it, in order to have the Start-End-Entries
>   set as given
> (defun foo ()
> " "
> (interactive "*")
> )
> (buffer-substring-no-properties 34 37)"e \""

There is no "stringification" done by buffer-substring-no-properties.
The Lisp reader prints the result of the evaluation in string syntax,
that is all.

> It happened to be a discussion in de.comp.editoren,
> concerning a stringify function
> The (still disputed) result exploits just the
> mentioned quality.

It doesn't.

> (defun region2string (start end)
> "Make a string from the chars of a region.
> Doublequotes inside will be quoted therefor.
> baz --> \"baz\"
> baz \"bar\" --> \"baz \\\"bar\\\"\""
> (interactive "r*")
> (goto-char end)
> (prin1 (buffer-substring-no-properties start end) (current-buffer))
> (delete-region start end))

The string quotes get added by prin1, not by
buffer-substring-no-properties.  You should really try reading up some
basics in the Emacs Lisp tutorial.

David Kastrup, Kriemhildstr. 15, 44793 Bochum

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