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"""Add external links to module code in Python object descriptions."""
from typing import Any, Dict, Set
from docutils import nodes
from docutils.nodes import Node
import sphinx
from sphinx import addnodes
from sphinx.application import Sphinx
from sphinx.errors import SphinxError
from sphinx.locale import _
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):
raise LinkcodeError(
"Function `linkcode_resolve` is not given in conf.py")
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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