fixes #405

fastcore/_nbdev.py

@@ -244,6 +244,8 @@
          "gather_attrs": "05_transform.ipynb",
          "gather_attr_names": "05_transform.ipynb",
          "Pipeline": "05_transform.ipynb",
+         "docstring": "06_docments.ipynb",
+         "parse_docstring": "06_docments.ipynb",
          "empty": "06_docments.ipynb",
          "docments": "06_docments.ipynb",
          "test_sig": "07_meta.ipynb",

fastcore/docments.py

@@ -4,19 +4,36 @@
 from __future__ import annotations
 
 
-__all__ = ['empty', 'docments']
+__all__ = ['docstring', 'parse_docstring', 'empty', 'docments']
 
 # Cell
 #nbdev_comment from __future__ import annotations
+
+import re
 from tokenize import tokenize,COMMENT
 from ast import parse,FunctionDef
 from io import BytesIO
 from textwrap import dedent
 from types import SimpleNamespace
 from inspect import getsource,isfunction,isclass,signature,Parameter
-from .basics import *
+from .utils import *
 
-import re
+from fastcore import docscrape
+from inspect import isclass
+
+# Cell
+def docstring(sym):
+    "Get docstring for `sym` for functions ad classes"
+    if isinstance(sym, str): return sym
+    res = getattr(sym, "__doc__", None)
+    if not res and isclass(sym): res = nested_attr(sym, "__init__.__doc__")
+    return res or ""
+
+# Cell
+def parse_docstring(sym):
+    "Parse a numpy-style docstring in `sym`"
+    docs = docstring(sym)
+    return AttrDict(**docscrape.NumpyDocString(docstring(sym)))
 
 # Cell
 def _parses(s):
@@ -36,7 +53,7 @@ def _clean_comment(s):
 def _param_locs(s, returns=True):
     "`dict` of parameter line numbers to names"
     body = _parses(s).body
-    if len(body)!=1or not isinstance(body[0], FunctionDef): return None
+    if len(body)!=1 or not isinstance(body[0], FunctionDef): return None
     defn = body[0]
     res = {arg.lineno:arg.arg for arg in defn.args.args}
     if returns and defn.returns: res[defn.returns.lineno] = 'return'
@@ -59,21 +76,36 @@ def _get_full(anno, name, default, docs):
     if anno==empty and default!=empty: anno = type(default)
     return AttrDict(docment=docs.get(name), anno=anno, default=default)
 
+# Cell
+def _merge_doc(dm, npdoc):
+    if not npdoc: return dm
+    if not dm.anno or dm.anno==empty: dm.anno = npdoc.type
+    if not dm.docment: dm.docment = '\n'.join(npdoc.desc)
+    return dm
+
+def _merge_docs(dms, npdocs):
+    npparams = npdocs['Parameters']
+    params = {nm:_merge_doc(dm,npparams.get(nm,None)) for nm,dm in dms.items()}
+    if 'return' in dms: params['return'] = _merge_doc(dms['return'], npdocs['Returns'])
+    return params
+
 # Cell
 def docments(s, full=False, returns=True, eval_str=False):
     "`dict` of parameter names to 'docment-style' comments in function or string `s`"
+    nps = parse_docstring(s)
     if isclass(s): s = s.__init__ # Constructor for a class
     comments = {o.start[0]:_clean_comment(o.string) for o in _tokens(s) if o.type==COMMENT}
     parms = _param_locs(s, returns=returns)
     docs = {arg:_get_comment(line, arg, comments, parms) for line,arg in parms.items()}
-    if not full: return AttrDict(docs)
 
     if isinstance(s,str): s = eval(s)
     sig = signature(s)
     res = {arg:_get_full(p.annotation, p.name, p.default, docs) for arg,p in sig.parameters.items()}
     if returns: res['return'] = _get_full(sig.return_annotation, 'return', empty, docs)
+    res = _merge_docs(res, nps)
     if eval_str:
         hints = type_hints(s)
         for k,v in res.items():
             if k in hints: v['anno'] = hints.get(k)
+    if not full: res = {k:v['docment'] for k,v in res.items()}
     return AttrDict(res)

fastcore/docscrape.py

@@ -21,6 +21,11 @@
        contributors may be used to endorse or promote products derived
        from this software without specific prior written permission. """
 
+import textwrap, re, copy
+from warnings import warn
+from collections import namedtuple
+from collections.abc import Mapping
+
 __all__ = ['Parameter', 'NumpyDocString', 'dedent_lines']
 
 Parameter = namedtuple('Parameter', ['name', 'type', 'desc'])
@@ -89,14 +94,17 @@ def __str__(self):
 
 class NumpyDocString(Mapping):
     """Parses a numpydoc string to an abstract representation """
-    sections = { 'Signature': '', 'Summary': [''], 'Extended': [], 'Parameters': [], 'Returns': [], 'Yields': [], 'Raises': [] }
+    sections = { 'Summary': [''], 'Extended': [], 'Parameters': [], 'Returns': [] }
 
     def __init__(self, docstring, config=None):
         docstring = textwrap.dedent(docstring).split('\n')
         self._doc = Reader(docstring)
         self._parsed_data = copy.deepcopy(self.sections)
         self._parse()
-        if 'Parameters' in self: self['Parameters'] = {o.name:o for o in self['Parameters']}
+        self['Parameters'] = {o.name:o for o in self['Parameters']}
+        if self['Returns']: self['Returns'] = self['Returns'][0]
+        self['Summary'] = dedent_lines(self['Summary'], split=False)
+        self['Extended'] = dedent_lines(self['Extended'], split=False)
 
     def __iter__(self): return iter(self._parsed_data)
     def __len__(self): return len(self._parsed_data)
@@ -171,7 +179,6 @@ def _parse_summary(self):
             summary_str = " ".join([s.strip() for s in summary]).strip()
             compiled = re.compile(r'^([\w., ]+=)?\s*[\w\.]+\(.*\)$')
             if compiled.match(summary_str):
-                self['Signature'] = summary_str
                 if not self._is_at_section(): continue
             break
 
@@ -216,16 +223,12 @@ def _obj(self):
 
     def _error_location(self, msg, error=True):
         if self._obj is not None:
-            # we know where the docs came from:
-            try: filename = inspect.getsourcefile(self._obj)
-            except TypeError: filename = None
             # Make UserWarning more descriptive via object introspection.
             # Skip if introspection fails
             name = getattr(self._obj, '__name__', None)
             if name is None:
                 name = getattr(getattr(self._obj, '__class__', None), '__name__', None)
             if name is not None: msg += f" in the docstring of {name}"
-            msg += f" in {filename}." if filename else ""
         if error: raise ValueError(msg)
         else: warn(msg)
 
@@ -234,10 +237,6 @@ def _error_location(self, msg, error=True):
     def _str_header(self, name, symbol='-'): return [name, len(name)*symbol]
     def _str_indent(self, doc, indent=4): return [' '*indent + line for line in doc]
 
-    def _str_signature(self):
-        if self['Signature']: return [self['Signature'].replace('*', r'\*')] + ['']
-        return ['']
-
     def _str_summary(self):
         if self['Summary']: return self['Summary'] + ['']
         return []
@@ -259,18 +258,10 @@ def _str_param_list(self, name):
             out += ['']
         return out
 
-    def __str__(self, func_role=''):
-        out = []
-        out += self._str_signature()
-        out += self._str_summary()
-        out += self._str_extended_summary()
-        for param_list in ('Parameters', 'Returns', 'Yields', 'Receives', 'Other Parameters', 'Raises', 'Warns'):
-            out += self._str_param_list(param_list)
-        for param_list in ('Attributes', 'Methods'): out += self._str_param_list(param_list)
-        return '\n'.join(out)
-
 
-def dedent_lines(lines):
+def dedent_lines(lines, split=True):
     """Deindent a list of lines maximally"""
-    return textwrap.dedent("\n".join(lines)).split("\n")
+    res = textwrap.dedent("\n".join(lines))
+    if split: res = res.split("\n")
+    return res