text.texi - `buffer-substring'

text.texi - `buffer-substring'

[Andreas Roehler]

Evaluation of the given example to `buffer-substring'
produces a different result as shown in the manual.

Whereas the manual demonstrates

          ---------- Buffer: foo ----------
          This is the contents of buffer foo

          ---------- Buffer: foo ----------

          (buffer-substring 1 10)
               => "This is t"

I get

(buffer-substring 1 10)#("This is t" 0 1 (fontified t) 1 9 (fontified t))

ie text-properties are copied as a kind of comment
behind, not solely `along' as the info says. (Reading
the info I would understand, that the chars copied into
the returned string are propertized as the original
one, as it seems the case altogether.)

The mentioned copying effects eventually following procedures.

(setq baz (buffer-substring 1 10))

baz --> #("This is t" 0 1 (fontified t) 1 9 (fontified t))

Maybe it's a `buffer-substring' bug ?

__
Andreas Roehler

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Re: text.texi - `buffer-substring'

[Miles Bader]

Andreas Roehler <andreas.roehler@online.de> writes:
> (buffer-substring 1 10)#("This is t" 0 1 (fontified t) 1 9 (fontified t))
>
> ie text-properties are copied as a kind of comment
> behind, not solely `along' as the info says. (Reading
> the info I would understand, that the chars copied into
> the returned string are propertized as the original
> one, as it seems the case altogether.)

No, you are still confusing the _printed representation_ of the return
value of buffer-substring with the actual return value.

Try this:

  (type-of (buffer-substring 1 10))

It returns `string', showing that the return value of buffer-substring
is really a string.

-Miles
-- 
`...the Soviet Union was sliding in to an economic collapse so comprehensive
 that in the end its factories produced not goods but bads: finished products
 less valuable than the raw materials they were made from.'  [The Economist]

Re: text.texi - `buffer-substring'

[Andreas Roehler]

Miles Bader schrieb:
> Andreas Roehler <andreas.roehler@online.de> writes:
>> (buffer-substring 1 10)#("This is t" 0 1 (fontified t) 1 9 (fontified t))
>>
>> ie text-properties are copied as a kind of comment
>> behind, not solely `along' as the info says. (Reading
>> the info I would understand, that the chars copied into
>> the returned string are propertized as the original
>> one, as it seems the case altogether.)
>
> No, you are still confusing the _printed representation_ of the return
> value of buffer-substring with the actual return value.
>
> Try this:
>
>   (type-of (buffer-substring 1 10))
>
> It returns `string', showing that the return value of buffer-substring
> is really a string.
>
> -Miles
Sorry, thanks.

__
Andreas Roehler

Re: text.texi - `buffer-substring'

[Eli Zaretskii]

> Date: Fri, 23 Jun 2006 08:47:06 +0200
> From: Andreas Roehler <andreas.roehler@online.de>
> Cc: Richard Stallman <rms@gnu.org>
> 
> Evaluation of the given example to `buffer-substring'
> produces a different result as shown in the manual.
> 
> Whereas the manual demonstrates
> 
>           ---------- Buffer: foo ----------
>           This is the contents of buffer foo
> 
>           ---------- Buffer: foo ----------
> 
>           (buffer-substring 1 10)
>                => "This is t"
> 
> I get
> 
> (buffer-substring 1 10)#("This is t" 0 1 (fontified t) 1 9 (fontified t))

I cannot reproduce this.  If the buffer `foo' is in Fundamental mode,
I get precisely what the manual says.

Your output suggests that the buffer with the text has font-lock
turned on.  Please see how could that happen in Fundamental mode.

> ie text-properties are copied as a kind of comment
> behind, not solely `along' as the info says.

That is normal behavior.

> (setq baz (buffer-substring 1 10))
> 
> baz --> #("This is t" 0 1 (fontified t) 1 9 (fontified t))
> 
> Maybe it's a `buffer-substring' bug ?

No, it's expected behavior when the buffer was fontified.

Re: text.texi - `buffer-substring'

[Richard Stallman]

    I get

    (buffer-substring 1 10)#("This is t" 0 1 (fontified t) 1 9 (fontified t))

    ie text-properties are copied as a kind of comment
    behind, not solely `along' as the info says.

The text properties ARE copied along into thye string, and that is how
such a string looks when you print it.

I will clarify that.