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Subject[PATCH v2 1/5] docs: cdomain.py: add support for two new Sphinx 3.1+ tags
Date
Since Sphinx 3.0, the C domain code was rewritten, but only
after version 3.1 it got support for setting namespaces on
C domains, with is something that it is required, in order to
document system calls, like ioctl() and others.

As part of changing the documentation subsystem to properly
build with Sphinx 3.1+, add support for two tags:

- :c:expr:`foo`
- .. c:namespace::"

The first one just replaces the expresion by ``foo``, with
produces a monotext expression.

The second one replaces the optional "name" tag for functions,
setting a domain for all C references found after its usage.

With that, it should be possible to convert the existing
documentation to be compatible with both Sphinx 1.x/2.x and
3.1+.

Unfortunately, building the documentation with Sphinx 3.0
will produce lots of warnings, because the namespace tag
doesn't exist there, with will cause both warnings for the
usage of a non-existing tag and warnings about multiple
definitions for system calls. There's not much we can
do to solve such issues.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
Documentation/sphinx/cdomain.py | 56 ++++++++++++++++++++++++++++++++-
1 file changed, 55 insertions(+), 1 deletion(-)

diff --git a/Documentation/sphinx/cdomain.py b/Documentation/sphinx/cdomain.py
index cbac8e608dc4..3f6228787282 100644
--- a/Documentation/sphinx/cdomain.py
+++ b/Documentation/sphinx/cdomain.py
@@ -40,14 +40,61 @@ from sphinx import addnodes
from sphinx.domains.c import c_funcptr_sig_re, c_sig_re
from sphinx.domains.c import CObject as Base_CObject
from sphinx.domains.c import CDomain as Base_CDomain
+from itertools import chain
+import re

-__version__ = '1.0'
+__version__ = '1.1'

# Get Sphinx version
major, minor, patch = sphinx.version_info[:3]

+# Namespace to be prepended to the full name
+namespace = None
+
+#
+# Handle trivial newer c domain tags that are part of Sphinx 3.1 c domain tags
+# - Convert :c:expr:`foo` into ``foo``
+# - Store the namespace if ".. c:namespace::" tag is found
+
+RE_namespace = re.compile(r'^\s*..\s*c:namespace::\s*(\S+)\s*$')
+RE_expr = re.compile(r':c:expr:`([^\`]+)`')
+
+def markup_namespace(match):
+ namespace = match.group(1)
+
+ return ""
+
+def markup_c_expr(match):
+
+ return '\ ``' + match.group(1) + '``\ '
+
+def c_markups(app, docname, source):
+ result = ""
+ markup_func = {
+ RE_namespace: markup_namespace,
+ RE_expr: markup_c_expr
+ }
+
+ lines = iter(source[0].splitlines(True))
+ for n in lines:
+ match_iterators = [regex.finditer(n) for regex in markup_func]
+ matches = sorted(chain(*match_iterators), key=lambda m: m.start())
+ for m in matches:
+ n = n[:m.start()] + markup_func[m.re](m) + n[m.end():]
+
+ result = result + n
+
+ source[0] = result
+
+#
+# Now implements support for the cdomain namespacing logic
+#
+
def setup(app):

+ # Handle easy Sphinx 3.1+ simple new tags: :c:expr and .. c:namespace::
+ app.connect('source-read', c_markups)
+
if (major == 1 and minor < 8):
app.override_domain(CDomain)
else:
@@ -107,6 +154,9 @@ class CObject(Base_CObject):
param += nodes.emphasis(argname, argname)
paramlist += param

+ if namespace:
+ fullname = namespace + "." + fullname
+
return fullname

def handle_signature(self, sig, signode):
@@ -122,6 +172,10 @@ class CObject(Base_CObject):
else:
# FIXME: handle :name: value of other declaration types?
pass
+ else:
+ if namespace:
+ fullname = namespace + "." + fullname
+
return fullname

def add_target_and_index(self, name, sig, signode):
--
2.26.2
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