Re: [PATCH 19/25] qapi: Improve reporting of invalid flags

[Markus Armbruster <armbru@redhat.com>]

Markus Armbruster <armbru@redhat.com> writes:

> Eric Blake <eblake@redhat.com> writes:
>
>> On 9/24/19 8:28 AM, Markus Armbruster wrote:
>>> Split check_flags() off check_keys() and have check_exprs() call it
>>> later, so its error messages gain an "in definition" line.  Tweak the
>>> error messages.
>>> 
>>> Checking values in a function named check_keys() is unclean anyway.
>>> 
>>> Signed-off-by: Markus Armbruster <armbru@redhat.com>
>>> ---
>>>  scripts/qapi/common.py                     | 22 ++++++++++++----------
>>>  tests/qapi-schema/allow-preconfig-test.err |  3 ++-
>>>  tests/qapi-schema/args-bad-boxed.err       |  3 ++-
>>>  tests/qapi-schema/oob-test.err             |  3 ++-
>>>  tests/qapi-schema/type-bypass-bad-gen.err  |  3 ++-
>>>  5 files changed, 20 insertions(+), 14 deletions(-)
>>> 
>>
>>> +
>>> +def check_flags(expr, info):
>>> +    for key in ['gen', 'success-response']:
>>> +        if key in expr and expr[key] is not False:
>>
>> Is it any more pythonic and/or a micro-optimization to compress this to:
>>
>> if expr.get(key, False) is not False:
>>
>>> +            raise QAPISemError(
>>> +                info, "flag '%s' may only use false value" % key)
>>> +    for key in ['boxed', 'allow-oob', 'allow-preconfig']:
>>> +        if key in expr and expr[key] is not True:
>>
>> and here too.
>
> Will do.

Second thoughts in the morning:

    if key in expr and expr[key] is not VALUE:

feels slightly clearer than

    if expr.get(key, VALUE) is not VALUE:

>> Reviewed-by: Eric Blake <eblake@redhat.com>
>
> Thanks!