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Re: [libvirt] [PATCH] libvirt-domain.h: Fix enum description placement

On Fri, Jul 21, 2017 at 12:52:06PM +0200, Michal Privoznik wrote:
> There are only two acceptable places for describing enum values.
> It's either:
>     typedef enum {
>         /* Some long description. Therefore it's placed before
>          * the value. */
>         VIR_ENUM_A_VAL = 1,
>     } virEnumA;
> or:
>     typedef enum {
>         VIR_ENUM_B_VAL = 1, /* Some short description */
>     } virEnumB;
> However, during review of a patch sent upstream I realized that
> is not always the case. I went through all the public header
> files and identified all the offenders. Luckily there were just
> two of them.
> Yes, this makes our HTML generated documentation broken, but
> that's bug of the generator. Our header files shouldn't be forced
> to use something we don't want to.

FWIW, the problem is in the parseEnumBLock() method in apibuild.py

Once it has completed parsing an enum item, it delays adding that
enum to the list until it sees the next item, so that it can capture
the trailing comment.

The only way we can distinguish between a comment that comes before
the enum vs a comment after the enum, on the same line, is by detecting
whitespace (newline) before the trailing comment. Unfortunately I don't
thing this is exposed by the lexer right, so its not entirely easy
to solve.

> Signed-off-by: Michal Privoznik <mprivozn redhat com>
> ---
>  include/libvirt/libvirt-domain.h | 17 +++++++++--------
>  1 file changed, 9 insertions(+), 8 deletions(-)

Reviewed-by: Daniel P. Berrange <berrange redhat com>

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