On 19-Dec-2011 14:40, Дмитрий Франк wrote:
> 19 декабря 2011 г. 17:03 пользователь Ingo Karkat <[email protected]
> <mailto:[email protected]>>написал:
>
> On 19-Dec-2011 13:35, Дмитрий Франк wrote:
>
> > Citation from help: "Return the *byte count* from the start of the
> buffer for
> > line {lnum}"
> >
> > Returned *byte count* is wrong. It returns character count instead of
> > byte count.
>
> I cannot reproduce this, neither with Vim 7.3.0 on Windows/x64, nor with
> Vim
> 7.3.353 on Linux/x86:
>
> $ vim -N -u NONE --cmd "set enc=utf-8" -c "call setline(1, ['foobaN',
> ''])" -c
> "2|echo line2byte('.')"
> 8
> $ vim -N -u NONE --cmd "set enc=utf-8" -c "call setline(1,
> ['fooba'.nr2char(1049), ''])" -c "2|echo line2byte('.')"
> 9
>
> Please post your Vim version, and steps to reproduce.
>
> -- regards, ingo
>
> PS: Please bottom-post on vim_dev.
>
>
> i use Windows, and i have to keep Vim's encoding cp1251. (standard encoding
> for
> russian Windows)
>
> Vim 7.3.46 on Windows/x86
>
> $ vim -N -u NONE --cmd "set enc=cp1251 | set fenc=utf-8 | set ff=unix" -c
> "call
> setline(1,['foobaN', ''])" -c "2|echo line2byte('.')"
> 8
> $ vim -N -u NONE --cmd "set enc=cp1251 | set fenc=utf-8 | set ff=unix" -c
> "call
> setline(1,['fooba'.nr2char(1049), ''])" -c "2|echo line2byte('.')"
> 8
>
> seems like line2byte() looks on the &encoding , but it should look on the
> &fileencoding .
Your analysis looks right, and probably doesn't surprise the devs, because
internally Vim always uses 'encoding' to represent the buffer (and only converts
to 'fileencoding' during writes).
This raises the question how line2byte() (and go/:goto commands) should behave.
I would side with you, using byte counts of the file, not the internal
representation (especially because for all Unicode encodings, Vim internally
uses UTF-8, so it wouldn't be possible to jump to UTF-16 / UTF-32 offsets even
by setting 'encoding' to it).
:help line2byte() indirectly supports this (*emphasis* mine):
> This can also be used to get the byte count for the line just
> below the last line: >
> line2byte(line("$") + 1)
> *This is the file size plus one.*
I think this issue needs at least a note in the documentation, and I wonder
whether it's feasible to implement in the way you suggest. (For maximum
flexibility, line2byte() could take an optional flag whether file- or
internal-offset is wanted.)
-- regards, ingo
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