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"""Add external links to module code in Python object descriptions."""
from __future__ import annotations
from typing import TYPE_CHECKING, Any
from docutils import nodes
import sphinx
from sphinx import addnodes
from sphinx.errors import SphinxError
from sphinx.locale import _
if TYPE_CHECKING:
from docutils.nodes import Node
from sphinx.application import Sphinx
class LinkcodeError(SphinxError):
category = "linkcode error"
def doctree_read(app: Sphinx, doctree: Node) -> None:
env = app.builder.env
resolve_target = getattr(env.config, 'linkcode_resolve', None)
if not callable(env.config.linkcode_resolve):
msg = 'Function `linkcode_resolve` is not given in conf.py'
raise LinkcodeError(msg)
assert resolve_target is not None # for mypy
domain_keys = {
'py': ['module', 'fullname'],
'c': ['names'],
'cpp': ['names'],
'js': ['object', 'fullname'],
}
for objnode in list(doctree.findall(addnodes.desc)):
domain = objnode.get('domain')
uris: set[str] = set()
for signode in objnode:
if not isinstance(signode, addnodes.desc_signature):
continue
# Convert signode to a specified format
info = {}
for key in domain_keys.get(domain, []):
value = signode.get(key)
if not value:
value = ''
info[key] = value
if not info:
continue
# Call user code to resolve the link
uri = resolve_target(domain, info)
if not uri:
# no source
continue
if uri in uris or not uri:
# only one link per name, please
continue
uris.add(uri)
inline = nodes.inline('', _('[source]'), classes=['viewcode-link'])
onlynode = addnodes.only(expr='html')
onlynode += nodes.reference('', '', inline, internal=False, refuri=uri)
signode += onlynode
def setup(app: Sphinx) -> dict[str, Any]:
app.connect('doctree-read', doctree_read)
app.add_config_value('linkcode_resolve', None, '')
return {'version': sphinx.__display_version__, 'parallel_read_safe': True}
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