ENH: Xref param type

.gitignore

@@ -8,3 +8,4 @@
 *.swo
 build
 dist
+doc/_build

.travis.yml

@@ -1,23 +1,21 @@
 # After changing this file, check it on:
 #   http://lint.travis-ci.org/
 language: python
+dist: xenial
 sudo: false
-env:
-  - SPHINX_SPEC="Sphinx==1.2.3"
-  - SPHINX_SPEC="Sphinx"
 matrix:
   include:
-    - python: 3.6
+    - python: 3.7
+      env: SPHINX_SPEC="==1.2.3" SPHINXOPTS=""
+    - python: 3.7
     - python: 2.7
-      env:
-        - SPHINXOPTS='-W'
 cache:
   directories:
     - $HOME/.cache/pip
 before_install:
   - sudo apt-get install texlive texlive-latex-extra latexmk
   - pip install --upgrade pip setuptools  # Upgrade pip and setuptools to get ones with `wheel` support
-  - pip install pytest numpy matplotlib ${SPHINX_SPEC}
+  - pip install pytest numpy matplotlib sphinx${SPHINX_SPEC}
 script:
   - |
     python setup.py sdist

doc/Makefile

@@ -2,7 +2,7 @@
 #
 
 # You can set these variables from the command line.
-SPHINXOPTS    =
+SPHINXOPTS    = -nWT --keep-going
 SPHINXBUILD   = sphinx-build
 PAPER         =
 BUILDDIR      = _build

doc/conf.py

@@ -82,6 +82,8 @@
 release = numpydoc.__version__
 version = re.sub(r'(\d+\.\d+)\.\d+(.*)', r'\1\2', numpydoc.__version__)
 version = re.sub(r'(\.dev\d+).*?$', r'\1', version)
+numpydoc_xref_param_type = True
+numpydoc_xref_ignore = {'optional', 'type_without_description', 'BadException'}
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -269,5 +271,6 @@
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {
     'python': ('http://docs.python.org/', None),
-    'scikitlearn': ('http://scikit-learn.org/stable/', None),
+    'numpy': ('https://www.numpy.org/devdocs', None),
+    'sklearn': ('http://scikit-learn.org/stable/', None),
 }

doc/example.py

@@ -78,10 +78,10 @@ def foo(var1, var2, long_var_name='hi'):
 
     See Also
     --------
-    otherfunc : relationship (optional)
-    newfunc : Relationship (optional), which could be fairly long, in which
-              case the line wraps here.
-    thirdfunc, fourthfunc, fifthfunc
+    numpy.array : relationship (optional)
+    numpy.ndarray : Relationship (optional), which could be fairly long, in
+                    which case the line wraps here.
+    numpy.dot, numpy.linalg.norm, numpy.eye
 
     Notes
     -----

doc/install.rst

@@ -47,6 +47,52 @@ numpydoc_attributes_as_param_list : bool
   as the Parameter section. If it's False, the Attributes section will be
   formatted as the Methods section using an autosummary table.
   ``True`` by default.
+numpydoc_xref_param_type : bool
+  Whether to create cross-references for the parameter types in the
+  ``Parameters``, ``Other Parameters``, ``Returns`` and ``Yields``
+  sections of the docstring.
+  ``False`` by default.
+
+  .. note:: Depending on the link types, the CSS styles might be different.
+            consider overridding e.g. ``span.classifier a span.xref`` and
+            ``span.classifier a code.docutils.literal.notranslate``
+            CSS classes to achieve a uniform appearance.
+
+numpydoc_xref_aliases : dict
+  Mappings to fully qualified paths (or correct ReST references) for the
+  aliases/shortcuts used when specifying the types of parameters.
+  The keys should not have any spaces. Together with the ``intersphinx``
+  extension, you can map to links in any documentation.
+  The default is an empty ``dict``.
+
+  If you have the following ``intersphinx`` namespace configuration::
+
+      intersphinx_mapping = {
+          'python': ('https://docs.python.org/3/', None),
+          'numpy': ('https://docs.scipy.org/doc/numpy', None),
+          ...
+      }
+
+  The default ``numpydoc_xref_aliases`` will supply some common ``Python``
+  standard library and ``NumPy`` names for you. Then for your module, a useful
+  ``dict`` may look like the following (e.g., if you were documenting
+  :mod:`sklearn.model_selection`)::
+
+      numpydoc_xref_aliases = {
+          'LeaveOneOut': 'sklearn.model_selection.LeaveOneOut',
+          ...
+      }
+
+  This option depends on the ``numpydoc_xref_param_type`` option
+  being ``True``.
+numpydoc_xref_ignore : set
+    Words not to cross-reference. Most likely, these are common words
+    used in parameter type descriptions that may be confused for
+    classes of the same name. For example::
+
+        numpydoc_xref_ignore = {'type', 'optional', 'default'}
+
+    The default is an empty set.
 numpydoc_edit_link : bool
   .. deprecated:: edit your HTML template instead
 

numpydoc/docscrape_sphinx.py

@@ -17,6 +17,7 @@
 from sphinx.jinja2glue import BuiltinTemplateLoader
 
 from .docscrape import NumpyDocString, FunctionDoc, ClassDoc
+from .xref import make_xref
 
 if sys.version_info[0] >= 3:
     sixu = lambda s: s
@@ -37,6 +38,9 @@ def load_config(self, config):
         self.use_blockquotes = config.get('use_blockquotes', False)
         self.class_members_toctree = config.get('class_members_toctree', True)
         self.attributes_as_param_list = config.get('attributes_as_param_list', True)
+        self.xref_param_type = config.get('xref_param_type', False)
+        self.xref_aliases = config.get('xref_aliases', dict())
+        self.xref_ignore = config.get('xref_ignore', set())
         self.template = config.get('template', None)
         if self.template is None:
             template_dirs = [os.path.join(os.path.dirname(__file__), 'templates')]
@@ -79,11 +83,17 @@ def _str_returns(self, name='Returns'):
             out += self._str_field_list(name)
             out += ['']
             for param in self[name]:
+                param_type = param.type
+                if param_type and self.xref_param_type:
+                    param_type = make_xref(
+                        param_type,
+                        self.xref_aliases,
+                        self.xref_ignore)
                 if param.name:
                     out += self._str_indent([named_fmt % (param.name.strip(),
-                                                          param.type)])
+                                                          param_type)])
                 else:
-                    out += self._str_indent([unnamed_fmt % param.type.strip()])
+                    out += self._str_indent([unnamed_fmt % param_type.strip()])
                 if not param.desc:
                     out += self._str_indent(['..'], 8)
                 else:
@@ -158,10 +168,8 @@ def _process_param(self, param, desc, fake_autosummary):
 
         prefix = getattr(self, '_name', '')
         if prefix:
-            autosum_prefix = '~%s.' % prefix
             link_prefix = '%s.' % prefix
         else:
-            autosum_prefix = ''
             link_prefix = ''
 
         # Referenced object has a docstring
@@ -213,8 +221,15 @@ def _str_param_list(self, name, fake_autosummary=False):
                 parts = []
                 if display_param:
                     parts.append(display_param)
-                if param.type:
-                    parts.append(param.type)
+                param_type = param.type
+                if param_type:
+                    param_type = param.type
+                    if self.xref_param_type:
+                        param_type = make_xref(
+                            param_type,
+                            self.xref_aliases,
+                            self.xref_ignore)
+                    parts.append(param_type)
                 out += self._str_indent([' : '.join(parts)])
 
                 if desc and self.use_blockquotes:

numpydoc/numpydoc.py

@@ -37,6 +37,7 @@
     raise RuntimeError("Sphinx 1.0.1 or newer is required")
 
 from .docscrape_sphinx import get_doc_object
+from .xref import DEFAULT_LINKS
 from . import __version__
 
 if sys.version_info[0] >= 3:
@@ -154,7 +155,11 @@ def mangle_docstrings(app, what, name, obj, options, lines):
            app.config.numpydoc_show_inherited_class_members,
            'class_members_toctree': app.config.numpydoc_class_members_toctree,
            'attributes_as_param_list':
-           app.config.numpydoc_attributes_as_param_list}
+           app.config.numpydoc_attributes_as_param_list,
+           'xref_param_type': app.config.numpydoc_xref_param_type,
+           'xref_aliases': app.config.numpydoc_xref_aliases,
+           'xref_ignore': app.config.numpydoc_xref_ignore,
+           }
 
     cfg.update(options or {})
     u_NL = sixu('\n')
@@ -218,6 +223,7 @@ def setup(app, get_doc_object_=get_doc_object):
 
     app.setup_extension('sphinx.ext.autosummary')
 
+    app.connect('builder-inited', update_config)
     app.connect('autodoc-process-docstring', mangle_docstrings)
     app.connect('autodoc-process-signature', mangle_signature)
     app.connect('doctree-read', relabel_references)
@@ -230,6 +236,9 @@ def setup(app, get_doc_object_=get_doc_object):
     app.add_config_value('numpydoc_class_members_toctree', True, True)
     app.add_config_value('numpydoc_citation_re', '[a-z0-9_.-]+', True)
     app.add_config_value('numpydoc_attributes_as_param_list', True, True)
+    app.add_config_value('numpydoc_xref_param_type', False, True)
+    app.add_config_value('numpydoc_xref_aliases', dict(), True)
+    app.add_config_value('numpydoc_xref_ignore', set(), True)
 
     # Extra mangling domains
     app.add_domain(NumpyPythonDomain)
@@ -239,6 +248,14 @@ def setup(app, get_doc_object_=get_doc_object):
                 'parallel_read_safe': True}
     return metadata
 
+
+def update_config(app):
+    """Update the configuration with default values."""
+    for key, value in DEFAULT_LINKS.items():
+        if key not in app.config.numpydoc_xref_aliases:
+            app.config.numpydoc_xref_aliases[key] = value
+
+
 # ------------------------------------------------------------------------------
 # Docstring-mangling domains
 # ------------------------------------------------------------------------------