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Wed, 7 Oct 2020 10:50:40 +0200 (CEST) From: Markus Armbruster To: John Snow Subject: Re: [PATCH v5 11/36] qapi/common.py: Add indent manager References: <20201005195158.2348217-1-jsnow@redhat.com> <20201005195158.2348217-12-jsnow@redhat.com> Date: Wed, 07 Oct 2020 10:50:40 +0200 In-Reply-To: <20201005195158.2348217-12-jsnow@redhat.com> (John Snow's message of "Mon, 5 Oct 2020 15:51:33 -0400") Message-ID: <87d01uifmn.fsf@dusky.pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Received-SPF: pass client-ip=63.128.21.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/07 00:44:56 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.733, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org, Eduardo Habkost , Cleber Rosa Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" John Snow writes: > Code style tools really dislike the use of global keywords, because it > generally involves re-binding the name at runtime which can have strange > effects depending on when and how that global name is referenced in > other modules. > > Make a little indent level manager instead. > > Signed-off-by: John Snow > Reviewed-by: Eduardo Habkost > Reviewed-by: Cleber Rosa Intentation is a job for QAPIGen (and its subtypes). But if this patch is easier to achieve this series' goal, I don't mind. > --- > scripts/qapi/common.py | 49 ++++++++++++++++++++++++++++-------------- > scripts/qapi/visit.py | 7 +++--- > 2 files changed, 36 insertions(+), 20 deletions(-) > > diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py > index cee63eb95c7..b35318b72cf 100644 > --- a/scripts/qapi/common.py > +++ b/scripts/qapi/common.py > @@ -93,33 +93,50 @@ def c_name(name, protect=True): > pointer_suffix = ' *' + eatspace > > > -def genindent(count): > - ret = '' > - for _ in range(count): > - ret += ' ' > - return ret > +class Indentation: > + """ > + Indentation level management. > > + :param initial: Initial number of spaces, default 0. > + """ > + def __init__(self, initial: int = 0) -> None: > + self._level = initial > > -indent_level = 0 > + def __int__(self) -> int: > + return self._level > > + def __repr__(self) -> str: > + return "{}({:d})".format(type(self).__name__, self._level) > > -def push_indent(indent_amount=4): > - global indent_level > - indent_level += indent_amount > + def __str__(self) -> str: > + """Return the current indentation as a string of spaces.""" > + return ' ' * self._level > > + def __bool__(self) -> bool: > + """True when there is a non-zero indentation.""" > + return bool(self._level) > > -def pop_indent(indent_amount=4): > - global indent_level > - indent_level -= indent_amount > + def increase(self, amount: int = 4) -> None: > + """Increase the indentation level by ``amount``, default 4.""" > + self._level += amount > + > + def decrease(self, amount: int = 4) -> None: > + """Decrease the indentation level by ``amount``, default 4.""" > + if self._level < amount: > + raise ArithmeticError( > + f"Can't remove {amount:d} spaces from {self!r}") Raise a fancy error when there's an actual need for it. You're not coding a framework thousands of people you never heard of will put to uses you cannot imagine. > + self._level -= amount > + > + > +indent = Indentation() > > > # Generate @code with @kwds interpolated. > -# Obey indent_level, and strip eatspace. > +# Obey indent, and strip eatspace. > def cgen(code, **kwds): > raw = code % kwds > - if indent_level: > - indent = genindent(indent_level) > - raw = re.sub(r'^(?!(#|$))', indent, raw, flags=re.MULTILINE) > + if indent: > + raw = re.sub(r'^(?!(#|$))', str(indent), raw, flags=re.MULTILINE) > return re.sub(re.escape(eatspace) + r' *', '', raw) > > > diff --git a/scripts/qapi/visit.py b/scripts/qapi/visit.py > index 808410d6f1b..14f30c228b7 100644 > --- a/scripts/qapi/visit.py > +++ b/scripts/qapi/visit.py > @@ -18,9 +18,8 @@ > c_name, > gen_endif, > gen_if, > + indent, > mcgen, > - pop_indent, > - push_indent, > ) > from .gen import QAPISchemaModularCVisitor, ifcontext > from .schema import QAPISchemaObjectType > @@ -69,7 +68,7 @@ def gen_visit_object_members(name, base, members, variants): > if (visit_optional(v, "%(name)s", &obj->has_%(c_name)s)) { > ''', > name=memb.name, c_name=c_name(memb.name)) > - push_indent() > + indent.increase() > ret += mcgen(''' > if (!visit_type_%(c_type)s(v, "%(name)s", &obj->%(c_name)s, errp)) { > return false; > @@ -78,7 +77,7 @@ def gen_visit_object_members(name, base, members, variants): > c_type=memb.type.c_name(), name=memb.name, > c_name=c_name(memb.name)) > if memb.optional: > - pop_indent() > + indent.decrease() > ret += mcgen(''' > } > ''')