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From: Markus Armbruster <armbru@redhat.com>
To: John Snow <jsnow@redhat.com>
Cc: Michael Roth <michael.roth@amd.com>,
	Cleber Rosa <crosa@redhat.com>,
	qemu-devel@nongnu.org, Eduardo Habkost <ehabkost@redhat.com>
Subject: Re: [PATCH v4 13/19] qapi/expr.py: Consolidate check_if_str calls in check_if
Date: Thu, 25 Mar 2021 16:15:32 +0100
Message-ID: <87eeg3s1rf.fsf@dusky.pond.sub.org> (raw)
In-Reply-To: <20210325060356.4040114-14-jsnow@redhat.com> (John Snow's message of "Thu, 25 Mar 2021 02:03:50 -0400")

John Snow <jsnow@redhat.com> writes:

> This is a small rewrite to address some minor style nits.
>
> Don't compare against the empty list to check for the empty condition, and
> move the normalization forward to unify the check on the now-normalized
> structure.
>
> With the check unified, the local nested function isn't needed anymore
> and can be brought down into the normal flow of the function. With the
> nesting level changed, shuffle the error strings around a bit to get
> them to fit in 79 columns.
>
> Note: although ifcond is typed as Sequence[str] elsewhere, we *know* that
> the parser will produce real, bona-fide lists. It's okay to check
> isinstance(ifcond, list) here.
>
> Signed-off-by: John Snow <jsnow@redhat.com>
> ---
>  scripts/qapi/expr.py | 32 ++++++++++++++------------------
>  1 file changed, 14 insertions(+), 18 deletions(-)
>
> diff --git a/scripts/qapi/expr.py b/scripts/qapi/expr.py
> index ea9d39fcf2..5921fa34ab 100644
> --- a/scripts/qapi/expr.py
> +++ b/scripts/qapi/expr.py
> @@ -144,30 +144,26 @@ def check_flags(expr: _JSONObject, info: QAPISourceInfo) -> None:
>  
>  def check_if(expr: _JSONObject, info: QAPISourceInfo, source: str) -> None:
>  
> -    def check_if_str(ifcond: object) -> None:
> -        if not isinstance(ifcond, str):
> -            raise QAPISemError(
> -                info,
> -                "'if' condition of %s must be a string or a list of strings"
> -                % source)
> -        if ifcond.strip() == '':
> -            raise QAPISemError(
> -                info,
> -                "'if' condition '%s' of %s makes no sense"
> -                % (ifcond, source))
> -
>      ifcond = expr.get('if')
>      if ifcond is None:
>          return
> +
>      if isinstance(ifcond, list):
> -        if ifcond == []:
> +        if not ifcond:
>              raise QAPISemError(
> -                info, "'if' condition [] of %s is useless" % source)
> -        for elt in ifcond:
> -            check_if_str(elt)
> +                info, f"'if' condition [] of {source} is useless")

Unrelated change from interpolation to formatted string literal.

>      else:
> -        check_if_str(ifcond)
> -        expr['if'] = [ifcond]
> +        # Normalize to a list
> +        ifcond = expr['if'] = [ifcond]
> +
> +    for elt in ifcond:
> +        if not isinstance(elt, str):
> +            raise QAPISemError(info, (
> +                f"'if' condition of {source}"
> +                " must be a string or a list of strings"))
> +        if not elt.strip():
> +            raise QAPISemError(
> +                info, f"'if' condition '{elt}' of {source} makes no sense")

Likewise.

I like formatted string literals, they're often easier to read than
interpolation.  But let's try to keep patches focused on their stated
purpose.

I'd gladly consider a series that convers to formatted strings
wholesale.  But I guess we better finish the typing job, first.

>  
>  
>  def normalize_members(members: object) -> None:



  reply index

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-25  6:03 [PATCH v4 00/19] qapi: static typing conversion, pt3 John Snow
2021-03-25  6:03 ` [PATCH v4 01/19] qapi/expr: Comment cleanup John Snow
2021-03-25 15:41   ` Markus Armbruster
2021-03-25 20:06     ` John Snow
2021-03-25  6:03 ` [PATCH v4 02/19] flake8: Enforce shorter line length for comments and docstrings John Snow
2021-03-25 15:21   ` Markus Armbruster
2021-03-25 20:20     ` John Snow
2021-03-26  6:26       ` Markus Armbruster
2021-03-26 16:30         ` John Snow
2021-03-26 16:44           ` Peter Maydell
2021-04-08  8:32             ` Markus Armbruster
2021-04-08  8:58             ` Daniel P. Berrangé
2021-04-09  9:33               ` Markus Armbruster
2021-04-09 17:08                 ` John Snow
2021-04-08  8:35           ` Markus Armbruster
2021-04-16 12:44   ` Markus Armbruster
2021-04-16 20:25     ` John Snow
2021-04-17 10:52       ` Markus Armbruster
2021-04-20 18:06         ` John Snow
2021-03-25  6:03 ` [PATCH v4 03/19] qapi/expr.py: Remove 'info' argument from nested check_if_str John Snow
2021-03-25  6:03 ` [PATCH v4 04/19] qapi/expr.py: Check for dict instead of OrderedDict John Snow
2021-03-25  6:03 ` [PATCH v4 05/19] qapi/expr.py: constrain incoming expression types John Snow
2021-03-25 14:04   ` Markus Armbruster
2021-03-25 20:48     ` John Snow
2021-03-26  5:40       ` Markus Armbruster
2021-03-26 17:12         ` John Snow
2021-03-25  6:03 ` [PATCH v4 06/19] qapi/expr.py: Add assertion for union type 'check_dict' John Snow
2021-03-25  6:03 ` [PATCH v4 07/19] qapi/expr.py: move string check upwards in check_type John Snow
2021-03-25  6:03 ` [PATCH v4 08/19] qapi: add tests for invalid 'data' field type John Snow
2021-03-25 14:24   ` Markus Armbruster
2021-03-25  6:03 ` [PATCH v4 09/19] qapi/expr.py: Check type of 'data' member John Snow
2021-03-25 14:26   ` Markus Armbruster
2021-03-25 21:04     ` John Snow
2021-03-25  6:03 ` [PATCH v4 10/19] qapi/expr.py: Add casts in a few select cases John Snow
2021-03-25 14:33   ` Markus Armbruster
2021-03-25 23:32     ` John Snow
2021-03-25  6:03 ` [PATCH v4 11/19] qapi/expr.py: Modify check_keys to accept any Collection John Snow
2021-03-25 14:45   ` Markus Armbruster
2021-03-25 23:37     ` John Snow
2021-03-25  6:03 ` [PATCH v4 12/19] qapi/expr.py: add type hint annotations John Snow
2021-03-25  6:03 ` [PATCH v4 13/19] qapi/expr.py: Consolidate check_if_str calls in check_if John Snow
2021-03-25 15:15   ` Markus Armbruster [this message]
2021-03-26  0:07     ` John Snow
2021-03-25  6:03 ` [PATCH v4 14/19] qapi/expr.py: Remove single-letter variable John Snow
2021-03-25  6:03 ` [PATCH v4 15/19] qapi/expr.py: enable pylint checks John Snow
2021-03-25  6:03 ` [PATCH v4 16/19] qapi/expr.py: Add docstrings John Snow
2021-04-14 15:04   ` Markus Armbruster
2021-04-17  1:00     ` John Snow
2021-04-17 13:18       ` Markus Armbruster
2021-04-21  1:27         ` John Snow
2021-04-21 13:58           ` Markus Armbruster
2021-04-21 18:20             ` John Snow
2021-03-25  6:03 ` [PATCH v4 17/19] qapi/expr.py: Use tuples instead of lists for static data John Snow
2021-03-25 15:19   ` Markus Armbruster
2021-03-25  6:03 ` [PATCH v4 18/19] qapi/expr.py: move related checks inside check_xxx functions John Snow
2021-03-25  6:03 ` [PATCH v4 19/19] qapi/expr.py: Use an expression checker dispatch table John Snow
2021-03-25 15:46 ` [PATCH v4 00/19] qapi: static typing conversion, pt3 Markus Armbruster
2021-03-26  0:40 ` John Snow
2021-03-26 18:01 ` John Snow

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