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# -*- coding: utf-8 -*-
"""
sphinx.ext.linkcode
~~~~~~~~~~~~~~~~~~~
Add external links to module code in Python object descriptions.
:copyright: Copyright 2007-2014 by the Sphinx team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from docutils import nodes
import sphinx
from sphinx import addnodes
from sphinx.locale import _
from sphinx.errors import SphinxError
class LinkcodeError(SphinxError):
category = "linkcode error"
def doctree_read(app, doctree):
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 = dict(
py=['module', 'fullname'],
c=['names'],
cpp=['names'],
js=['object', 'fullname'],
)
for objnode in doctree.traverse(addnodes.desc):
domain = objnode.get('domain')
uris = 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)
onlynode = addnodes.only(expr='html')
onlynode += nodes.reference('', '', internal=False, refuri=uri)
onlynode[0] += nodes.inline('', _('[source]'),
classes=['viewcode-link'])
signode += onlynode
def setup(app):
app.connect('doctree-read', doctree_read)
app.add_config_value('linkcode_resolve', None, '')
return {'version': sphinx.__version__, 'parallel_read_safe': True}
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