f546ff0c0c
As promised, drop support for some ancient sphinx releases, along with a lot of the cruft that was required to make that support work. Signed-off-by: Jonathan Corbet <corbet@lwn.net>
254 lines
7.6 KiB
Python
254 lines
7.6 KiB
Python
# -*- coding: utf-8; mode: python -*-
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# pylint: disable=W0141,C0113,C0103,C0325
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u"""
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cdomain
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~~~~~~~
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Replacement for the sphinx c-domain.
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:copyright: Copyright (C) 2016 Markus Heiser
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:license: GPL Version 2, June 1991 see Linux/COPYING for details.
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List of customizations:
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* Moved the *duplicate C object description* warnings for function
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declarations in the nitpicky mode. See Sphinx documentation for
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the config values for ``nitpick`` and ``nitpick_ignore``.
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* Add option 'name' to the "c:function:" directive. With option 'name' the
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ref-name of a function can be modified. E.g.::
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.. c:function:: int ioctl( int fd, int request )
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:name: VIDIOC_LOG_STATUS
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The func-name (e.g. ioctl) remains in the output but the ref-name changed
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from 'ioctl' to 'VIDIOC_LOG_STATUS'. The function is referenced by::
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* :c:func:`VIDIOC_LOG_STATUS` or
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* :any:`VIDIOC_LOG_STATUS` (``:any:`` needs sphinx 1.3)
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* Handle signatures of function-like macros well. Don't try to deduce
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arguments types of function-like macros.
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"""
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from docutils import nodes
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from docutils.parsers.rst import directives
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import sphinx
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from sphinx import addnodes
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from sphinx.domains.c import c_funcptr_sig_re, c_sig_re
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from sphinx.domains.c import CObject as Base_CObject
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from sphinx.domains.c import CDomain as Base_CDomain
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from itertools import chain
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import re
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__version__ = '1.1'
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# Get Sphinx version
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major, minor, patch = sphinx.version_info[:3]
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# Namespace to be prepended to the full name
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namespace = None
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#
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# Handle trivial newer c domain tags that are part of Sphinx 3.1 c domain tags
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# - Store the namespace if ".. c:namespace::" tag is found
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#
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RE_namespace = re.compile(r'^\s*..\s*c:namespace::\s*(\S+)\s*$')
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def markup_namespace(match):
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global namespace
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namespace = match.group(1)
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return ""
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#
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# Handle c:macro for function-style declaration
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#
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RE_macro = re.compile(r'^\s*..\s*c:macro::\s*(\S+)\s+(\S.*)\s*$')
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def markup_macro(match):
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return ".. c:function:: " + match.group(1) + ' ' + match.group(2)
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#
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# Handle newer c domain tags that are evaluated as .. c:type: for
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# backward-compatibility with Sphinx < 3.0
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#
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RE_ctype = re.compile(r'^\s*..\s*c:(struct|union|enum|enumerator|alias)::\s*(.*)$')
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def markup_ctype(match):
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return ".. c:type:: " + match.group(2)
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#
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# Handle newer c domain tags that are evaluated as :c:type: for
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# backward-compatibility with Sphinx < 3.0
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#
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RE_ctype_refs = re.compile(r':c:(var|struct|union|enum|enumerator)::`([^\`]+)`')
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def markup_ctype_refs(match):
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return ":c:type:`" + match.group(2) + '`'
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#
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# Simply convert :c:expr: and :c:texpr: into a literal block.
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#
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RE_expr = re.compile(r':c:(expr|texpr):`([^\`]+)`')
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def markup_c_expr(match):
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return '\ ``' + match.group(2) + '``\ '
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#
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# Parse Sphinx 3.x C markups, replacing them by backward-compatible ones
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#
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def c_markups(app, docname, source):
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result = ""
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markup_func = {
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RE_namespace: markup_namespace,
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RE_expr: markup_c_expr,
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RE_macro: markup_macro,
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RE_ctype: markup_ctype,
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RE_ctype_refs: markup_ctype_refs,
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}
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lines = iter(source[0].splitlines(True))
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for n in lines:
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match_iterators = [regex.finditer(n) for regex in markup_func]
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matches = sorted(chain(*match_iterators), key=lambda m: m.start())
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for m in matches:
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n = n[:m.start()] + markup_func[m.re](m) + n[m.end():]
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result = result + n
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source[0] = result
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#
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# Now implements support for the cdomain namespacing logic
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#
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def setup(app):
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# Handle easy Sphinx 3.1+ simple new tags: :c:expr and .. c:namespace::
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app.connect('source-read', c_markups)
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if (major == 1 and minor < 8):
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app.override_domain(CDomain)
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else:
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app.add_domain(CDomain, override=True)
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return dict(
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version = __version__,
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parallel_read_safe = True,
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parallel_write_safe = True
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)
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class CObject(Base_CObject):
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"""
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Description of a C language object.
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"""
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option_spec = {
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"name" : directives.unchanged
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}
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def handle_func_like_macro(self, sig, signode):
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u"""Handles signatures of function-like macros.
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If the objtype is 'function' and the the signature ``sig`` is a
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function-like macro, the name of the macro is returned. Otherwise
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``False`` is returned. """
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global namespace
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if not self.objtype == 'function':
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return False
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m = c_funcptr_sig_re.match(sig)
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if m is None:
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m = c_sig_re.match(sig)
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if m is None:
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raise ValueError('no match')
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rettype, fullname, arglist, _const = m.groups()
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arglist = arglist.strip()
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if rettype or not arglist:
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return False
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arglist = arglist.replace('`', '').replace('\\ ', '') # remove markup
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arglist = [a.strip() for a in arglist.split(",")]
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# has the first argument a type?
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if len(arglist[0].split(" ")) > 1:
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return False
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# This is a function-like macro, it's arguments are typeless!
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signode += addnodes.desc_name(fullname, fullname)
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paramlist = addnodes.desc_parameterlist()
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signode += paramlist
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for argname in arglist:
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param = addnodes.desc_parameter('', '', noemph=True)
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# separate by non-breaking space in the output
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param += nodes.emphasis(argname, argname)
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paramlist += param
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if namespace:
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fullname = namespace + "." + fullname
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return fullname
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def handle_signature(self, sig, signode):
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"""Transform a C signature into RST nodes."""
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global namespace
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fullname = self.handle_func_like_macro(sig, signode)
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if not fullname:
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fullname = super(CObject, self).handle_signature(sig, signode)
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if "name" in self.options:
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if self.objtype == 'function':
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fullname = self.options["name"]
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else:
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# FIXME: handle :name: value of other declaration types?
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pass
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else:
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if namespace:
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fullname = namespace + "." + fullname
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return fullname
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def add_target_and_index(self, name, sig, signode):
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# for C API items we add a prefix since names are usually not qualified
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# by a module name and so easily clash with e.g. section titles
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targetname = 'c.' + name
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if targetname not in self.state.document.ids:
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signode['names'].append(targetname)
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signode['ids'].append(targetname)
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signode['first'] = (not self.names)
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self.state.document.note_explicit_target(signode)
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inv = self.env.domaindata['c']['objects']
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if (name in inv and self.env.config.nitpicky):
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if self.objtype == 'function':
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if ('c:func', name) not in self.env.config.nitpick_ignore:
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self.state_machine.reporter.warning(
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'duplicate C object description of %s, ' % name +
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'other instance in ' + self.env.doc2path(inv[name][0]),
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line=self.lineno)
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inv[name] = (self.env.docname, self.objtype)
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indextext = self.get_index_text(name)
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if indextext:
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self.indexnode['entries'].append(
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('single', indextext, targetname, '', None))
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class CDomain(Base_CDomain):
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"""C language domain."""
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name = 'c'
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label = 'C'
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directives = {
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'function': CObject,
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'member': CObject,
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'macro': CObject,
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'type': CObject,
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'var': CObject,
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}
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