From 707f2bbb7899297884095a76a1237c8dbfce09fd Mon Sep 17 00:00:00 2001 From: John Snow Date: Mon, 10 Mar 2025 23:42:29 -0400 Subject: [PATCH] docs/qapi-domain: Fix error context reporting in Sphinx 5.x and 6.x Sphinx 5.3.0 to Sphinx 6.2.0 has a bug where nested content in an ObjectDescription content block has its error position reported incorrectly due to an oversight when they added nested section support to this directive. (This bug is present in Sphinx's own Python and C domains; test it yourself by creating a py:func directive and creating a syntax error in the directive's content block. The reporting will be incorrect.) To avoid overriding and re-implementing the entirety of the run() method, a workaround is employed where we parse the content block ourselves in before_content(), then null the content block to make Sphinx's own parsing a no-op. Then, in transform_content (which occurs after Sphinx's nested parse), we simply swap our own parsed content tree back in for Sphinx's. It appears a little tricky, but it's the nicest solution I can find. Signed-off-by: John Snow Message-ID: <20250311034303.75779-32-jsnow@redhat.com> Acked-by: Markus Armbruster Signed-off-by: Markus Armbruster --- docs/sphinx/compat.py | 56 ++++++++++++++++++++++++++++++++++++++ docs/sphinx/qapi_domain.py | 15 ++++++---- 2 files changed, 65 insertions(+), 6 deletions(-) diff --git a/docs/sphinx/compat.py b/docs/sphinx/compat.py index f068d70388..9cf7fe006e 100644 --- a/docs/sphinx/compat.py +++ b/docs/sphinx/compat.py @@ -4,6 +4,7 @@ Sphinx cross-version compatibility goop import re from typing import ( + TYPE_CHECKING, Any, Callable, Optional, @@ -12,9 +13,11 @@ from typing import ( from docutils import nodes from docutils.nodes import Element, Node, Text +from docutils.statemachine import StringList import sphinx from sphinx import addnodes, util +from sphinx.directives import ObjectDescription from sphinx.environment import BuildEnvironment from sphinx.roles import XRefRole from sphinx.util import docfields @@ -172,3 +175,56 @@ class CompatGroupedField(docfields.GroupedField): class CompatTypedField(docfields.TypedField): if MAKE_XREF_WORKAROUND: make_xref = _compat_make_xref + + +# ################################################################ +# Nested parsing error location fix for Sphinx 5.3.0 < x < 6.2.0 # +# ################################################################ + +# When we require Sphinx 4.x, the TYPE_CHECKING hack where we avoid +# subscripting ObjectDescription at runtime can be removed in favor of +# just always subscripting the class. + +# When we require Sphinx > 6.2.0, the rest of this compatibility hack +# can be dropped and QAPIObject can just inherit directly from +# ObjectDescription[Signature]. + +SOURCE_LOCATION_FIX = (5, 3, 0) <= sphinx.version_info[:3] < (6, 2, 0) + +Signature = str + + +if TYPE_CHECKING: + _BaseClass = ObjectDescription[Signature] +else: + _BaseClass = ObjectDescription + + +class ParserFix(_BaseClass): + + _temp_content: StringList + _temp_offset: int + _temp_node: Optional[addnodes.desc_content] + + def before_content(self) -> None: + # Work around a sphinx bug and parse the content ourselves. + self._temp_content = self.content + self._temp_offset = self.content_offset + self._temp_node = None + + if SOURCE_LOCATION_FIX: + self._temp_node = addnodes.desc_content() + self.state.nested_parse( + self.content, self.content_offset, self._temp_node + ) + # Sphinx will try to parse the content block itself, + # Give it nothingness to parse instead. + self.content = StringList() + self.content_offset = 0 + + def transform_content(self, content_node: addnodes.desc_content) -> None: + # Sphinx workaround: Inject our parsed content and restore state. + if self._temp_node: + content_node += self._temp_node.children + self.content = self._temp_content + self.content_offset = self._temp_offset diff --git a/docs/sphinx/qapi_domain.py b/docs/sphinx/qapi_domain.py index b23db1eba2..ca3f3a7e2d 100644 --- a/docs/sphinx/qapi_domain.py +++ b/docs/sphinx/qapi_domain.py @@ -29,6 +29,8 @@ from compat import ( CompatGroupedField, CompatTypedField, KeywordNode, + ParserFix, + Signature, SpaceNode, ) from sphinx import addnodes @@ -147,12 +149,7 @@ class QAPIXRefRole(XRefRole): return results, [] -# Alias for the return of handle_signature(), which is used in several places. -# (In the Python domain, this is Tuple[str, str] instead.) -Signature = str - - -class QAPIDescription(ObjectDescription[Signature]): +class QAPIDescription(ParserFix): """ Generic QAPI description. @@ -422,6 +419,10 @@ class QAPIObject(QAPIDescription): logger.warning(msg, location=field) def transform_content(self, content_node: addnodes.desc_content) -> None: + # This hook runs after before_content and the nested parse, but + # before the DocFieldTransformer is executed. + super().transform_content(content_node) + self._add_infopips(content_node) # Validate field lists. @@ -519,10 +520,12 @@ class QAPIObjectWithMembers(QAPIObject): class QAPIEvent(QAPIObjectWithMembers): + # pylint: disable=too-many-ancestors """Description of a QAPI Event.""" class QAPIJSONObject(QAPIObjectWithMembers): + # pylint: disable=too-many-ancestors """Description of a QAPI Object: structs and unions.""" -- 2.39.5