File size: 10,258 Bytes
1c60c6e
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
# coding: utf-8
"""
Sphinx directive integration
============================

We usually need to document the life-cycle of functions and classes:
when they are created, modified or deprecated.

To do that, `Sphinx <http://www.sphinx-doc.org>`_ has a set
of `Paragraph-level markups <http://www.sphinx-doc.org/en/stable/markup/para.html>`_:

- ``versionadded``: to document the version of the project which added the described feature to the library,
- ``versionchanged``: to document changes of a feature,
- ``deprecated``: to document a deprecated feature.

The purpose of this module is to defined decorators which adds this Sphinx directives
to the docstring of your function and classes.

Of course, the ``@deprecated`` decorator will emit a deprecation warning
when the function/method is called or the class is constructed.
"""
import re
import textwrap

import wrapt

from deprecated.classic import ClassicAdapter
from deprecated.classic import deprecated as _classic_deprecated


class SphinxAdapter(ClassicAdapter):
    """
    Sphinx adapter -- *for advanced usage only*

    This adapter override the :class:`~deprecated.classic.ClassicAdapter`
    in order to add the Sphinx directives to the end of the function/class docstring.
    Such a directive is a `Paragraph-level markup <http://www.sphinx-doc.org/en/stable/markup/para.html>`_

    - The directive can be one of "versionadded", "versionchanged" or "deprecated".
    - The version number is added if provided.
    - The reason message is obviously added in the directive block if not empty.
    """

    def __init__(
        self,
        directive,
        reason="",
        version="",
        action=None,
        category=DeprecationWarning,
        line_length=70,
    ):
        """
        Construct a wrapper adapter.

        :type  directive: str
        :param directive:
            Sphinx directive: can be one of "versionadded", "versionchanged" or "deprecated".

        :type  reason: str
        :param reason:
            Reason message which documents the deprecation in your library (can be omitted).

        :type  version: str
        :param version:
            Version of your project which deprecates this feature.
            If you follow the `Semantic Versioning <https://semver.org/>`_,
            the version number has the format "MAJOR.MINOR.PATCH".

        :type  action: str
        :param action:
            A warning filter used to activate or not the deprecation warning.
            Can be one of "error", "ignore", "always", "default", "module", or "once".
            If ``None`` or empty, the the global filtering mechanism is used.
            See: `The Warnings Filter`_ in the Python documentation.

        :type  category: type
        :param category:
            The warning category to use for the deprecation warning.
            By default, the category class is :class:`~DeprecationWarning`,
            you can inherit this class to define your own deprecation warning category.

        :type  line_length: int
        :param line_length:
            Max line length of the directive text. If non nul, a long text is wrapped in several lines.
        """
        if not version:
            # https://github.com/tantale/deprecated/issues/40
            raise ValueError("'version' argument is required in Sphinx directives")
        self.directive = directive
        self.line_length = line_length
        super(SphinxAdapter, self).__init__(reason=reason, version=version, action=action, category=category)

    def __call__(self, wrapped):
        """
        Add the Sphinx directive to your class or function.

        :param wrapped: Wrapped class or function.

        :return: the decorated class or function.
        """
        # -- build the directive division
        fmt = ".. {directive}:: {version}" if self.version else ".. {directive}::"
        div_lines = [fmt.format(directive=self.directive, version=self.version)]
        width = self.line_length - 3 if self.line_length > 3 else 2 ** 16
        reason = textwrap.dedent(self.reason).strip()
        for paragraph in reason.splitlines():
            if paragraph:
                div_lines.extend(
                    textwrap.fill(
                        paragraph,
                        width=width,
                        initial_indent="   ",
                        subsequent_indent="   ",
                    ).splitlines()
                )
            else:
                div_lines.append("")

        # -- get the docstring, normalize the trailing newlines
        # keep a consistent behaviour if the docstring starts with newline or directly on the first one
        docstring = wrapped.__doc__ or ""
        lines = docstring.splitlines(keepends=True) or [""]
        docstring = textwrap.dedent("".join(lines[1:])) if len(lines) > 1 else ""
        docstring = lines[0] + docstring
        if docstring:
            # An empty line must separate the original docstring and the directive.
            docstring = re.sub(r"\n+$", "", docstring, flags=re.DOTALL) + "\n\n"
        else:
            # Avoid "Explicit markup ends without a blank line" when the decorated function has no docstring
            docstring = "\n"

        # -- append the directive division to the docstring
        docstring += "".join("{}\n".format(line) for line in div_lines)

        wrapped.__doc__ = docstring
        if self.directive in {"versionadded", "versionchanged"}:
            return wrapped
        return super(SphinxAdapter, self).__call__(wrapped)

    def get_deprecated_msg(self, wrapped, instance):
        """
        Get the deprecation warning message (without Sphinx cross-referencing syntax) for the user.

        :param wrapped: Wrapped class or function.

        :param instance: The object to which the wrapped function was bound when it was called.

        :return: The warning message.

        .. versionadded:: 1.2.12
           Strip Sphinx cross-referencing syntax from warning message.

        """
        msg = super(SphinxAdapter, self).get_deprecated_msg(wrapped, instance)
        # Strip Sphinx cross reference syntax (like ":function:", ":py:func:" and ":py:meth:")
        # Possible values are ":role:`foo`", ":domain:role:`foo`"
        # where ``role`` and ``domain`` should match "[a-zA-Z]+"
        msg = re.sub(r"(?: : [a-zA-Z]+ )? : [a-zA-Z]+ : (`[^`]*`)", r"\1", msg, flags=re.X)
        return msg


def versionadded(reason="", version="", line_length=70):
    """
    This decorator can be used to insert a "versionadded" directive
    in your function/class docstring in order to documents the
    version of the project which adds this new functionality in your library.

    :param str reason:
        Reason message which documents the addition in your library (can be omitted).

    :param str version:
        Version of your project which adds this feature.
        If you follow the `Semantic Versioning <https://semver.org/>`_,
        the version number has the format "MAJOR.MINOR.PATCH", and,
        in the case of a new functionality, the "PATCH" component should be "0".

    :type  line_length: int
    :param line_length:
        Max line length of the directive text. If non nul, a long text is wrapped in several lines.

    :return: the decorated function.
    """
    adapter = SphinxAdapter(
        'versionadded',
        reason=reason,
        version=version,
        line_length=line_length,
    )
    return adapter


def versionchanged(reason="", version="", line_length=70):
    """
    This decorator can be used to insert a "versionchanged" directive
    in your function/class docstring in order to documents the
    version of the project which modifies this functionality in your library.

    :param str reason:
        Reason message which documents the modification in your library (can be omitted).

    :param str version:
        Version of your project which modifies this feature.
        If you follow the `Semantic Versioning <https://semver.org/>`_,
        the version number has the format "MAJOR.MINOR.PATCH".

    :type  line_length: int
    :param line_length:
        Max line length of the directive text. If non nul, a long text is wrapped in several lines.

    :return: the decorated function.
    """
    adapter = SphinxAdapter(
        'versionchanged',
        reason=reason,
        version=version,
        line_length=line_length,
    )
    return adapter


def deprecated(reason="", version="", line_length=70, **kwargs):
    """
    This decorator can be used to insert a "deprecated" directive
    in your function/class docstring in order to documents the
    version of the project which deprecates this functionality in your library.

    :param str reason:
        Reason message which documents the deprecation in your library (can be omitted).

    :param str version:
        Version of your project which deprecates this feature.
        If you follow the `Semantic Versioning <https://semver.org/>`_,
        the version number has the format "MAJOR.MINOR.PATCH".

    :type  line_length: int
    :param line_length:
        Max line length of the directive text. If non nul, a long text is wrapped in several lines.

    Keyword arguments can be:

    -   "action":
        A warning filter used to activate or not the deprecation warning.
        Can be one of "error", "ignore", "always", "default", "module", or "once".
        If ``None``, empty or missing, the the global filtering mechanism is used.

    -   "category":
        The warning category to use for the deprecation warning.
        By default, the category class is :class:`~DeprecationWarning`,
        you can inherit this class to define your own deprecation warning category.

    :return: a decorator used to deprecate a function.

    .. versionchanged:: 1.2.13
       Change the signature of the decorator to reflect the valid use cases.
    """
    directive = kwargs.pop('directive', 'deprecated')
    adapter_cls = kwargs.pop('adapter_cls', SphinxAdapter)
    kwargs["reason"] = reason
    kwargs["version"] = version
    kwargs["line_length"] = line_length
    return _classic_deprecated(directive=directive, adapter_cls=adapter_cls, **kwargs)