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# -*- coding: utf-8 -*-
"""
sphinx.ext.refcounting
~~~~~~~~~~~~~~~~~~~~~~
Supports reference count annotations for C API functions. Based on
refcount.py and anno-api.py in the old Python documentation tools.
Usage: Set the `refcount_file` config value to the path to the reference
count data file.
:copyright: Copyright 2007-2009 by the Sphinx team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from os import path
from docutils import nodes
from sphinx import addnodes
# refcount annotation
class refcount(nodes.emphasis): pass
class RCEntry:
def __init__(self, name):
self.name = name
self.args = []
self.result_type = ''
self.result_refs = None
class Refcounts(dict):
@classmethod
def fromfile(cls, filename):
d = cls()
fp = open(filename, 'r')
try:
for line in fp:
line = line.strip()
if line[:1] in ("", "#"):
# blank lines and comments
continue
parts = line.split(":", 4)
if len(parts) != 5:
raise ValueError("Wrong field count in %r" % line)
function, type, arg, refcount, comment = parts
# Get the entry, creating it if needed:
try:
entry = d[function]
except KeyError:
entry = d[function] = RCEntry(function)
if not refcount or refcount == "null":
refcount = None
else:
refcount = int(refcount)
# Update the entry with the new parameter or the result information.
if arg:
entry.args.append((arg, type, refcount))
else:
entry.result_type = type
entry.result_refs = refcount
finally:
fp.close()
return d
def add_refcount_annotations(self, app, doctree):
for node in doctree.traverse(addnodes.desc_content):
par = node.parent
if par['desctype'] != 'cfunction':
continue
if not par[0].has_key('names') or not par[0]['names']:
continue
entry = self.get(par[0]['names'][0])
if not entry:
continue
elif entry.result_type not in ("PyObject*", "PyVarObject*"):
continue
rc = 'Return value: '
if entry.result_refs is None:
rc += "Always NULL."
else:
rc += (entry.result_refs and "New" or "Borrowed") + " reference."
node.insert(0, refcount(rc, rc))
def init_refcounts(app):
if app.config.refcount_file:
refcounts = Refcounts.fromfile(
path.join(app.srcdir, app.config.refcount_file))
app.connect('doctree-read', refcounts.add_refcount_annotations)
def setup(app):
app.add_node(refcount)
app.add_config_value('refcount_file', '', True)
app.connect('builder-inited', init_refcounts)
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