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Re: [Qemu-devel] [PATCH for-2.9 16/47] qapi2texi: Convert to QAPISchemaV

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH for-2.9 16/47] qapi2texi: Convert to QAPISchemaVisitor
Date: Tue, 14 Mar 2017 12:31:56 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 03/13/2017 01:18 AM, Markus Armbruster wrote:
> qapi2texi works with schema expression trees.  Such a tight coupling
> to schema language syntax is not a good idea.  Convert it to the visitor
> interface the other generators use.
> No change to generated documentation.
> Signed-off-by: Markus Armbruster <address@hidden>
> ---
>  scripts/qapi2texi.py | 228 
> ++++++++++++++++++++++++++-------------------------
>  1 file changed, 118 insertions(+), 110 deletions(-)

> +    def visit_object_type(self, name, info, base, members, variants):
> +        doc = self.cur_doc
> +        if not variants:
> +            typ = 'Struct'
> +        elif variants._tag_name:        # TODO unclean member access
> +            typ = 'Flat Union'
> +        else:
> +            typ = 'Simple Union'

Do we even want to document this distinction to the end user?
Introspection managed to hide the difference by introducing the
appropriate generated wrapper types that demonstrate the additional {}
nesting in a way compatible with rewriting simple unions into flat
unions.  If we don't explain the difference here, we can get rid of the
unclean member access, but then again risk documentation that is not
clear whether {} nesting is needed.

I guess there's also the fact that for this patch, you intentionally
tried to make no difference to the generated docs (good); so any tweaks
to union output should be later patches anyways.

Reviewed-by: Eric Blake <address@hidden>

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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