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# -*- coding: utf-8 -*-
"""
sphinx.transforms.post_transforms
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Docutils transforms used by Sphinx.
:copyright: Copyright 2007-2017 by the Sphinx team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from docutils import nodes
from sphinx import addnodes
from sphinx.environment import NoUri
from sphinx.locale import _
from sphinx.transforms import SphinxTransform
from sphinx.util import logging
if False:
# For type annotation
from typing import Any, Dict, List, Tuple # NOQA
from sphinx.application import Sphinx # NOQA
from sphinx.domains import Domain # NOQA
logger = logging.getLogger(__name__)
class ReferencesResolver(SphinxTransform):
"""
Resolves cross-references on doctrees.
"""
default_priority = 10
def apply(self):
# type: () -> None
for node in self.document.traverse(addnodes.pending_xref):
contnode = node[0].deepcopy()
newnode = None
typ = node['reftype']
target = node['reftarget']
refdoc = node.get('refdoc', self.env.docname)
domain = None
try:
if 'refdomain' in node and node['refdomain']:
# let the domain try to resolve the reference
try:
domain = self.env.domains[node['refdomain']]
except KeyError:
raise NoUri
newnode = domain.resolve_xref(self.env, refdoc, self.app.builder,
typ, target, node, contnode)
# really hardwired reference types
elif typ == 'any':
newnode = self.resolve_anyref(refdoc, node, contnode)
# no new node found? try the missing-reference event
if newnode is None:
newnode = self.app.emit_firstresult('missing-reference', self.env,
node, contnode)
# still not found? warn if node wishes to be warned about or
# we are in nit-picky mode
if newnode is None:
self.warn_missing_reference(refdoc, typ, target, node, domain)
except NoUri:
newnode = contnode
node.replace_self(newnode or contnode)
def resolve_anyref(self, refdoc, node, contnode):
# type: (unicode, nodes.Node, nodes.Node) -> nodes.Node
"""Resolve reference generated by the "any" role."""
stddomain = self.env.get_domain('std')
target = node['reftarget']
results = [] # type: List[Tuple[unicode, nodes.Node]]
# first, try resolving as :doc:
doc_ref = stddomain.resolve_xref(self.env, refdoc, self.app.builder,
'doc', target, node, contnode)
if doc_ref:
results.append(('doc', doc_ref))
# next, do the standard domain (makes this a priority)
results.extend(stddomain.resolve_any_xref(self.env, refdoc, self.app.builder,
target, node, contnode))
for domain in self.env.domains.values():
if domain.name == 'std':
continue # we did this one already
try:
results.extend(domain.resolve_any_xref(self.env, refdoc, self.app.builder,
target, node, contnode))
except NotImplementedError:
# the domain doesn't yet support the new interface
# we have to manually collect possible references (SLOW)
for role in domain.roles:
res = domain.resolve_xref(self.env, refdoc, self.app.builder,
role, target, node, contnode)
if res and isinstance(res[0], nodes.Element):
results.append(('%s:%s' % (domain.name, role), res))
# now, see how many matches we got...
if not results:
return None
if len(results) > 1:
nice_results = ' or '.join(':%s:' % r[0] for r in results)
logger.warning(_('more than one target found for \'any\' cross-'
'reference %r: could be %s'), target, nice_results,
location=node)
res_role, newnode = results[0]
# Override "any" class with the actual role type to get the styling
# approximately correct.
res_domain = res_role.split(':')[0]
if newnode and newnode[0].get('classes'):
newnode[0]['classes'].append(res_domain)
newnode[0]['classes'].append(res_role.replace(':', '-'))
return newnode
def warn_missing_reference(self, refdoc, typ, target, node, domain):
# type: (unicode, unicode, unicode, nodes.Node, Domain) -> None
warn = node.get('refwarn')
if self.config.nitpicky:
warn = True
if self.env._nitpick_ignore:
dtype = domain and '%s:%s' % (domain.name, typ) or typ
if (dtype, target) in self.env._nitpick_ignore:
warn = False
# for "std" types also try without domain name
if (not domain or domain.name == 'std') and \
(typ, target) in self.env._nitpick_ignore:
warn = False
if not warn:
return
if domain and typ in domain.dangling_warnings:
msg = domain.dangling_warnings[typ]
elif node.get('refdomain', 'std') not in ('', 'std'):
msg = (_('%s:%s reference target not found: %%(target)s') %
(node['refdomain'], typ))
else:
msg = _('%r reference target not found: %%(target)s') % typ
logger.warning(msg % {'target': target},
location=node, type='ref', subtype=typ)
class OnlyNodeTransform(SphinxTransform):
default_priority = 50
def apply(self):
# type: () -> None
# A comment on the comment() nodes being inserted: replacing by [] would
# result in a "Losing ids" exception if there is a target node before
# the only node, so we make sure docutils can transfer the id to
# something, even if it's just a comment and will lose the id anyway...
for node in self.document.traverse(addnodes.only):
try:
ret = self.app.builder.tags.eval_condition(node['expr'])
except Exception as err:
logger.warning('exception while evaluating only directive expression: %s', err,
location=node)
node.replace_self(node.children or nodes.comment())
else:
if ret:
node.replace_self(node.children or nodes.comment())
else:
node.replace_self(nodes.comment())
def setup(app):
# type: (Sphinx) -> Dict[unicode, Any]
app.add_post_transform(ReferencesResolver)
app.add_post_transform(OnlyNodeTransform)
return {
'version': 'builtin',
'parallel_read_safe': True,
'parallel_write_safe': True,
}
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