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Date: Wed, 14 Oct 2020 11:56:44 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: "Nícolas F. R. A. Prado" <nfraprado@...tonmail.com>
Cc: Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, lkcamp@...ts.libreplanetbr.org,
andrealmeid@...labora.com
Subject: Re: [PATCH v2 5/5] docs: automarkup.py: Allow automatic
cross-reference inside C namespace
Em Tue, 13 Oct 2020 23:13:40 +0000
Nícolas F. R. A. Prado <nfraprado@...tonmail.com> escreveu:
> Sphinx 3.1 introduced namespaces for C cross-references. With this,
> each C domain type/function declaration is put inside the namespace that
> was active at the time of its declaration.
>
> To support automatic cross-reference inside C namespaces:
> - Save the C namespace used in each doc file (if any) at the source-read
> phase, in the beginning of the Sphinx process.
> - When making the automarkup, if any namespace was used in the current
> file, try to cross-reference to the symbol inside of it before trying
> in the global namespace.
>
> To make the first step possible, disable the parallel_read_safe option
> in Sphinx, since the dictionary that maps the files to the C namespaces
> can't be concurrently updated. This unfortunately increases the build
> time of the documentation.
Disabling parallel_read_safe will make performance very poor.
Doesn't the C domain store the current namespace somewhere?
If so, then, instead of using the source-read phase, something
else could be used instead.
>
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...tonmail.com>
> ---
> Documentation/sphinx/automarkup.py | 130 ++++++++++++++++++-----------
> 1 file changed, 82 insertions(+), 48 deletions(-)
>
> diff --git a/Documentation/sphinx/automarkup.py b/Documentation/sphinx/automarkup.py
> index 409dbc4100de..bca8cf5f519d 100644
> --- a/Documentation/sphinx/automarkup.py
> +++ b/Documentation/sphinx/automarkup.py
> @@ -45,6 +45,8 @@ RE_typedef = re.compile(r'\b(typedef)\s+([a-zA-Z_]\w+)', flags=re.ASCII)
> #
> RE_doc = re.compile(r'\bDocumentation(/[\w\-_/]+)(\.\w+)*')
>
> +RE_namespace = re.compile(r'^\s*..\s*c:namespace::\s*(\S+)\s*$')
> +
> #
> # Reserved C words that we should skip when cross-referencing
> #
> @@ -62,6 +64,8 @@ Skipfuncs = [ 'open', 'close', 'read', 'write', 'fcntl', 'mmap',
> 'select', 'poll', 'fork', 'execve', 'clone', 'ioctl',
> 'socket' ]
>
> +c_namespace = {}
> +
> def markup_refs(docname, app, node):
> t = node.astext()
> done = 0
> @@ -120,30 +124,42 @@ def markup_func_ref_sphinx3(docname, app, match):
> #
> # Go through the dance of getting an xref out of the C domain
> #
> - target = match.group(2)
> + base_target = match.group(2)
> target_text = nodes.Text(match.group(0))
> xref = None
> - if not (target in Skipfuncs or target in Skipnames):
> - for class_s, reftype_s in zip(class_str, reftype_str):
> - lit_text = nodes.literal(classes=['xref', 'c', class_s])
> - lit_text += target_text
> - pxref = addnodes.pending_xref('', refdomain = 'c',
> - reftype = reftype_s,
> - reftarget = target, modname = None,
> - classname = None)
> - #
> - # XXX The Latex builder will throw NoUri exceptions here,
> - # work around that by ignoring them.
> - #
> - try:
> - xref = cdom.resolve_xref(app.env, docname, app.builder,
> - reftype_s, target, pxref,
> - lit_text)
> - except NoUri:
> - xref = None
> -
> - if xref:
> - return xref
> + possible_targets = [base_target]
> + # Check if this document has a namespace, and if so, try
> + # cross-referencing inside it first.
> + try:
> + namespace = c_namespace[docname]
> + except KeyError:
> + pass
> + else:
> + possible_targets.insert(0, namespace + "." + base_target)
> +
> + if base_target not in Skipnames:
> + for target in possible_targets:
> + if target not in Skipfuncs:
> + for class_s, reftype_s in zip(class_str, reftype_str):
> + lit_text = nodes.literal(classes=['xref', 'c', class_s])
> + lit_text += target_text
> + pxref = addnodes.pending_xref('', refdomain = 'c',
> + reftype = reftype_s,
> + reftarget = target, modname = None,
> + classname = None)
> + #
> + # XXX The Latex builder will throw NoUri exceptions here,
> + # work around that by ignoring them.
> + #
> + try:
> + xref = cdom.resolve_xref(app.env, docname, app.builder,
> + reftype_s, target, pxref,
> + lit_text)
> + except NoUri:
> + xref = None
> +
> + if xref:
> + return xref
>
> return target_text
>
> @@ -171,34 +187,43 @@ def markup_c_ref(docname, app, match):
> #
> # Go through the dance of getting an xref out of the C domain
> #
> - target = match.group(2)
> + base_target = match.group(2)
> target_text = nodes.Text(match.group(0))
> xref = None
> - if not ((match.re == RE_function and target in Skipfuncs)
> - or (target in Skipnames)):
> - lit_text = nodes.literal(classes=['xref', 'c', class_str[match.re]])
> - lit_text += target_text
> - pxref = addnodes.pending_xref('', refdomain = 'c',
> - reftype = reftype_str[match.re],
> - reftarget = target, modname = None,
> - classname = None)
> - #
> - # XXX The Latex builder will throw NoUri exceptions here,
> - # work around that by ignoring them.
> - #
> - try:
> - xref = cdom.resolve_xref(app.env, docname, app.builder,
> - reftype_str[match.re], target, pxref,
> - lit_text)
> - except NoUri:
> - xref = None
> - #
> - # Return the xref if we got it; otherwise just return the plain text.
> - #
> - if xref:
> - return xref
> + possible_targets = [base_target]
> + # Check if this document has a namespace, and if so, try
> + # cross-referencing inside it first.
> + try:
> + namespace = c_namespace[docname]
> + except KeyError:
> + pass
> else:
> - return target_text
> + possible_targets.insert(0, namespace + "." + base_target)
> +
> + if base_target not in Skipnames:
> + for target in possible_targets:
> + if not (match.re == RE_function and target in Skipfuncs):
> + lit_text = nodes.literal(classes=['xref', 'c', class_str[match.re]])
> + lit_text += target_text
> + pxref = addnodes.pending_xref('', refdomain = 'c',
> + reftype = reftype_str[match.re],
> + reftarget = target, modname = None,
> + classname = None)
> + #
> + # XXX The Latex builder will throw NoUri exceptions here,
> + # work around that by ignoring them.
> + #
> + try:
> + xref = cdom.resolve_xref(app.env, docname, app.builder,
> + reftype_str[match.re], target, pxref,
> + lit_text)
> + except NoUri:
> + xref = None
> +
> + if xref:
> + return xref
> +
> + return target_text
>
> #
> # Try to replace a documentation reference of the form Documentation/... with a
> @@ -246,9 +271,18 @@ def auto_markup(app, doctree, name):
> if not isinstance(node.parent, nodes.literal):
> node.parent.replace(node, markup_refs(name, app, node))
>
> +def save_c_namespace(app, docname, source):
> + lines = iter(source[0].splitlines(True))
> + for l in lines:
> + match = RE_namespace.search(l)
> + if match:
> + c_namespace[docname] = match.group(1)
> + return
> +
> def setup(app):
> + app.connect('source-read', save_c_namespace)
> app.connect('doctree-resolved', auto_markup)
> return {
> - 'parallel_read_safe': True,
> + 'parallel_read_safe': False,
> 'parallel_write_safe': True,
> }
Thanks,
Mauro
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