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# -*- coding: utf-8 -*-
"""
c_annotations.py
~~~~~~~~~~~~~~~~
Supports annotations for C API elements:
* reference count annotations for C API functions. Based on
refcount.py and anno-api.py in the old Python documentation tools.
* stable API annotations
Usage:
* Set the `refcount_file` config value to the path to the reference
count data file.
* Set the `stable_abi_file` config value to the path to stable ABI list.
:copyright: Copyright 2007-2014 by Georg Brandl.
:license: Python license.
"""
from os import path
from docutils import nodes
from docutils.parsers.rst import directives
from docutils.parsers.rst import Directive
from docutils.statemachine import StringList
import csv
from sphinx import addnodes
from sphinx.domains.c import CObject
REST_ROLE_MAP = {
'function': 'func',
'var': 'data',
'type': 'type',
'macro': 'macro',
'type': 'type',
}
class RCEntry:
def __init__(self, name):
self.name = name
self.args = []
self.result_type = ''
self.result_refs = None
class Annotations:
def __init__(self, refcount_filename, stable_abi_file):
self.refcount_data = {}
with open(refcount_filename, 'r') as fp:
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 = self.refcount_data[function]
except KeyError:
entry = self.refcount_data[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
self.stable_abi_data = {}
with open(stable_abi_file, 'r') as fp:
for record in csv.DictReader(fp):
role = record['role']
name = record['name']
self.stable_abi_data[name] = record
def add_annotations(self, app, doctree):
for node in doctree.traverse(addnodes.desc_content):
par = node.parent
if par['domain'] != 'c':
continue
if not par[0].has_key('ids') or not par[0]['ids']:
continue
name = par[0]['ids'][0]
if name.startswith("c."):
name = name[2:]
objtype = par['objtype']
# Stable ABI annotation. These have two forms:
# Part of the [Stable ABI](link).
# Part of the [Stable ABI](link) since version X.Y.
record = self.stable_abi_data.get(name)
if record:
if record['role'] != objtype:
raise ValueError(
f"Object type mismatch in limited API annotation "
f"for {name}: {record['role']!r} != {objtype!r}")
stable_added = record['added']
message = ' Part of the '
emph_node = nodes.emphasis(message, message,
classes=['stableabi'])
ref_node = addnodes.pending_xref(
'Stable ABI', refdomain="std", reftarget='stable',
reftype='ref', refexplicit="False")
ref_node += nodes.Text('Stable ABI')
emph_node += ref_node
if record['ifdef_note']:
emph_node += nodes.Text(' ' + record['ifdef_note'])
if stable_added == '3.2':
# Stable ABI was introduced in 3.2.
emph_node += nodes.Text('.')
else:
emph_node += nodes.Text(f' since version {stable_added}.')
node.insert(0, emph_node)
# Return value annotation
if objtype != 'function':
continue
entry = self.refcount_data.get(name)
if not entry:
continue
elif not entry.result_type.endswith("Object*"):
continue
if entry.result_refs is None:
rc = 'Return value: Always NULL.'
elif entry.result_refs:
rc = 'Return value: New reference.'
else:
rc = 'Return value: Borrowed reference.'
node.insert(0, nodes.emphasis(rc, rc, classes=['refcount']))
def init_annotations(app):
annotations = Annotations(
path.join(app.srcdir, app.config.refcount_file),
path.join(app.srcdir, app.config.stable_abi_file),
)
app.connect('doctree-read', annotations.add_annotations)
class LimitedAPIList(Directive):
has_content = False
required_arguments = 0
optional_arguments = 0
final_argument_whitespace = True
def run(self):
content = []
for record in annotations.stable_abi_data.values():
role = REST_ROLE_MAP[record['role']]
name = record['name']
content.append(f'* :c:{role}:`{name}`')
pnode = nodes.paragraph()
self.state.nested_parse(StringList(content), 0, pnode)
return [pnode]
app.add_directive('limited-api-list', LimitedAPIList)
def setup(app):
app.add_config_value('refcount_file', '', True)
app.add_config_value('stable_abi_file', '', True)
app.connect('builder-inited', init_annotations)
# monkey-patch C object...
CObject.option_spec = {
'noindex': directives.flag,
'stableabi': directives.flag,
}
old_handle_signature = CObject.handle_signature
def new_handle_signature(self, sig, signode):
signode.parent['stableabi'] = 'stableabi' in self.options
return old_handle_signature(self, sig, signode)
CObject.handle_signature = new_handle_signature
return {'version': '1.0', 'parallel_read_safe': True}
|
