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"""Generating content for autodoc using typehints
"""
import re
from collections import OrderedDict
from typing import Any, Dict, Iterable, Set, cast
from docutils import nodes
from docutils.nodes import Element
from sphinx import addnodes
from sphinx.application import Sphinx
from sphinx.util import inspect, typing
def record_typehints(app: Sphinx, objtype: str, name: str, obj: Any,
options: Dict, args: str, retann: str) -> None:
"""Record type hints to env object."""
if app.config.autodoc_typehints_format == 'short':
mode = 'smart'
else:
mode = 'fully-qualified'
try:
if callable(obj):
annotations = app.env.temp_data.setdefault('annotations', {})
annotation = annotations.setdefault(name, OrderedDict())
sig = inspect.signature(obj, type_aliases=app.config.autodoc_type_aliases)
for param in sig.parameters.values():
if param.annotation is not param.empty:
annotation[param.name] = typing.stringify(param.annotation, mode)
if sig.return_annotation is not sig.empty:
annotation['return'] = typing.stringify(sig.return_annotation, mode)
except (TypeError, ValueError):
pass
def merge_typehints(app: Sphinx, domain: str, objtype: str, contentnode: Element) -> None:
if domain != 'py':
return
if app.config.autodoc_typehints not in ('both', 'description'):
return
try:
signature = cast(addnodes.desc_signature, contentnode.parent[0])
if signature['module']:
fullname = '.'.join([signature['module'], signature['fullname']])
else:
fullname = signature['fullname']
except KeyError:
# signature node does not have valid context info for the target object
return
annotations = app.env.temp_data.get('annotations', {})
if annotations.get(fullname, {}):
field_lists = [n for n in contentnode if isinstance(n, nodes.field_list)]
if field_lists == []:
field_list = insert_field_list(contentnode)
field_lists.append(field_list)
for field_list in field_lists:
if app.config.autodoc_typehints_description_target == "all":
modify_field_list(field_list, annotations[fullname])
else:
augment_descriptions_with_types(field_list, annotations[fullname])
def insert_field_list(node: Element) -> nodes.field_list:
field_list = nodes.field_list()
desc = [n for n in node if isinstance(n, addnodes.desc)]
if desc:
# insert just before sub object descriptions (ex. methods, nested classes, etc.)
index = node.index(desc[0])
node.insert(index - 1, [field_list])
else:
node += field_list
return field_list
def modify_field_list(node: nodes.field_list, annotations: Dict[str, str]) -> None:
arguments: Dict[str, Dict[str, bool]] = {}
fields = cast(Iterable[nodes.field], node)
for field in fields:
field_name = field[0].astext()
parts = re.split(' +', field_name)
if parts[0] == 'param':
if len(parts) == 2:
# :param xxx:
arg = arguments.setdefault(parts[1], {})
arg['param'] = True
elif len(parts) > 2:
# :param xxx yyy:
name = ' '.join(parts[2:])
arg = arguments.setdefault(name, {})
arg['param'] = True
arg['type'] = True
elif parts[0] == 'type':
name = ' '.join(parts[1:])
arg = arguments.setdefault(name, {})
arg['type'] = True
elif parts[0] == 'rtype':
arguments['return'] = {'type': True}
for name, annotation in annotations.items():
if name == 'return':
continue
arg = arguments.get(name, {})
if not arg.get('type'):
field = nodes.field()
field += nodes.field_name('', 'type ' + name)
field += nodes.field_body('', nodes.paragraph('', annotation))
node += field
if not arg.get('param'):
field = nodes.field()
field += nodes.field_name('', 'param ' + name)
field += nodes.field_body('', nodes.paragraph('', ''))
node += field
if 'return' in annotations and 'return' not in arguments:
field = nodes.field()
field += nodes.field_name('', 'rtype')
field += nodes.field_body('', nodes.paragraph('', annotation))
node += field
def augment_descriptions_with_types(
node: nodes.field_list,
annotations: Dict[str, str],
) -> None:
fields = cast(Iterable[nodes.field], node)
has_description = set() # type: Set[str]
has_type = set() # type: Set[str]
for field in fields:
field_name = field[0].astext()
parts = re.split(' +', field_name)
if parts[0] == 'param':
if len(parts) == 2:
# :param xxx:
has_description.add(parts[1])
elif len(parts) > 2:
# :param xxx yyy:
name = ' '.join(parts[2:])
has_description.add(name)
has_type.add(name)
elif parts[0] == 'type':
name = ' '.join(parts[1:])
has_type.add(name)
elif parts[0] in ('return', 'returns'):
has_description.add('return')
elif parts[0] == 'rtype':
has_type.add('return')
# Add 'type' for parameters with a description but no declared type.
for name in annotations:
if name in ('return', 'returns'):
continue
if name in has_description and name not in has_type:
field = nodes.field()
field += nodes.field_name('', 'type ' + name)
field += nodes.field_body('', nodes.paragraph('', annotations[name]))
node += field
# Add 'rtype' if 'return' is present and 'rtype' isn't.
if 'return' in annotations:
if 'return' in has_description and 'return' not in has_type:
field = nodes.field()
field += nodes.field_name('', 'rtype')
field += nodes.field_body('', nodes.paragraph('', annotations['return']))
node += field
def setup(app: Sphinx) -> Dict[str, Any]:
app.connect('autodoc-process-signature', record_typehints)
app.connect('object-description-transform', merge_typehints)
return {
'version': 'builtin',
'parallel_read_safe': True,
'parallel_write_safe': True,
}
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