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Sat, 10 Oct 2020 11:55:04 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PULL 11/34] qapi/common.py: Add indent manager Date: Sat, 10 Oct 2020 11:54:41 +0200 Message-Id: <20201010095504.796182-12-armbru@redhat.com> In-Reply-To: <20201010095504.796182-1-armbru@redhat.com> References: <20201010095504.796182-1-armbru@redhat.com> 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-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=216.205.24.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/10 02:57:53 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H4=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: peter.maydell@linaro.org, John Snow , Eduardo Habkost , Cleber Rosa Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: John Snow 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 Message-Id: <20201009161558.107041-12-jsnow@redhat.com> Reviewed-by: Markus Armbruster Signed-off-by: Markus Armbruster --- scripts/qapi/common.py | 57 +++++++++++++++++++++++++++--------------- scripts/qapi/visit.py | 7 +++--- 2 files changed, 40 insertions(+), 24 deletions(-) diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py index cee63eb95c..b35318b72c 100644 --- a/scripts/qapi/common.py +++ b/scripts/qapi/common.py @@ -93,33 +93,50 @@ eatspace = '\033EATSPACE.' 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 + + def __int__(self) -> int: + return self._level + + def __repr__(self) -> str: + return "{}({:d})".format(type(self).__name__, self._level) + + 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 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}") + self._level -= amount -indent_level = 0 - - -def push_indent(indent_amount=4): - global indent_level - indent_level += indent_amount - - -def pop_indent(indent_amount=4): - global indent_level - indent_level -= indent_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 9fdbe5b9ef..708f72c4a1 100644 --- a/scripts/qapi/visit.py +++ b/scripts/qapi/visit.py @@ -18,9 +18,8 @@ from .common import ( 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 @@ bool visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **errp) 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 @@ bool visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **errp) c_type=memb.type.c_name(), name=memb.name, c_name=c_name(memb.name)) if memb.optional: - pop_indent() + indent.decrease() ret += mcgen(''' } ''') -- 2.26.2