Merge pull request #3339 from marco-buttu/master

Added pyversion option for doctest (issue 3303)

AUTHORS

@@ -21,6 +21,7 @@ Other contributors, listed alphabetically, are:
 * Henrique Bastos -- SVG support for graphviz extension
 * Daniel Bültmann -- todo extension
 * Jean-François Burnol -- LaTeX improvements
+* Marco Buttu -- doctest extension (pyversion option)
 * Etienne Desautels -- apidoc module
 * Michael Droettboom -- inheritance_diagram extension
 * Charles Duffy -- original graphviz extension

CHANGES

@@ -43,6 +43,7 @@ Features added
 * C++, add ``:tparam-line-spec:`` option to templated declarations.
   When specified, each template parameter will be rendered on a separate line.
 * #3359: Allow sphinx.js in a user locale dir to override sphinx.js from Sphinx
+* #3303: Add ``:pyversion:`` option to the doctest directive.
 
 Bugs fixed
 ----------

doc/ext/doctest.rst

@@ -63,7 +63,7 @@ a comma-separated list of group names.
    default set of flags is specified by the :confval:`doctest_default_flags`
    configuration variable.
 
-   This directive supports two options:
+   This directive supports three options:
 
    * ``hide``, a flag option, hides the doctest block in other builders.  By
      default it is shown as a highlighted doctest block.
@@ -73,6 +73,19 @@ a comma-separated list of group names.
      explicit flags per example, with doctest comments, but they will show up in
      other builders too.)
 
+   * ``pyversion``, a string option, can be used to specify the required Python
+     version for the example to be tested. For instance, in the following case
+     the example will be tested only for Python versions greather than 3.3::
+
+         .. doctest::
+            :pyversion: > 3.3
+
+     The supported operands are ``<``, ``<=``, ``==``, ``>=``, ``>``, and
+     comparison is performed by `distutils.version.LooseVersion
+     <https://www.python.org/dev/peps/pep-0386/#distutils>`__.
+
+     .. versionadded:: 1.6
+
    Note that like with standard doctests, you have to use ``<BLANKLINE>`` to
    signal a blank line in the expected output.  The ``<BLANKLINE>`` is removed
    when building presentation output (HTML, LaTeX etc.).

sphinx/ext/doctest.py

@@ -15,10 +15,12 @@ import re
 import sys
 import time
 import codecs
+import platform
 from os import path
 import doctest
 
 from six import itervalues, StringIO, binary_type, text_type, PY2
+from distutils.version import LooseVersion
 
 from docutils import nodes
 from docutils.parsers.rst import Directive, directives
@@ -29,6 +31,7 @@ from sphinx.util import force_decode, logging
 from sphinx.util.nodes import set_source_info
 from sphinx.util.console import bold  # type: ignore
 from sphinx.util.osutil import fs_encoding
+from sphinx.locale import _
 
 if False:
     # For type annotation
@@ -54,6 +57,29 @@ else:
         return text
 
 
+def compare_version(ver1, ver2, operand):
+    """Compare `ver1` to `ver2`, relying on `operand`.
+
+    Some examples:
+
+        >>> compare_version('3.3', '3.5', '<=')
+        True
+        >>> compare_version('3.3', '3.2', '<=')
+        False
+        >>> compare_version('3.3a0', '3.3', '<=')
+        True
+    """
+    if operand not in ('<=', '<', '==', '>=', '>'):
+        raise ValueError("'%s' is not a valid operand.")
+    v1 = LooseVersion(ver1)
+    v2 = LooseVersion(ver2)
+    return ((operand == '<=' and (v1 <= v2)) or
+            (operand == '<' and (v1 < v2)) or
+            (operand == '==' and (v1 == v2)) or
+            (operand == '>=' and (v1 >= v2)) or
+            (operand == '>' and (v1 > v2)))
+
+
 # set up the necessary directives
 
 class TestDirective(Directive):
@@ -101,12 +127,32 @@ class TestDirective(Directive):
             # parse doctest-like output comparison flags
             option_strings = self.options['options'].replace(',', ' ').split()
             for option in option_strings:
-                if (option[0] not in '+-' or option[1:] not in
+                prefix, option_name = option[0], option[1:]
-                        doctest.OPTIONFLAGS_BY_NAME):  # type: ignore
+                if prefix not in '+-':  # type: ignore
-                    # XXX warn?
+                    self.state.document.reporter.warning(
+                        _("missing '+' or '-' in '%s' option.") % option,
+                        line=self.lineno)
+                    continue
+                if option_name not in doctest.OPTIONFLAGS_BY_NAME:  # type: ignore
+                    self.state.document.reporter.warning(
+                        _("'%s' is not a valid option.") % option_name,
+                        line=self.lineno)
                     continue
                 flag = doctest.OPTIONFLAGS_BY_NAME[option[1:]]  # type: ignore
                 node['options'][flag] = (option[0] == '+')
+        if self.name == 'doctest' and 'pyversion' in self.options:
+            try:
+                option = self.options['pyversion']
+                # :pyversion: >= 3.6   -->   operand='>=', option_version='3.6'
+                operand, option_version = [item.strip() for item in option.split()]
+                running_version = platform.python_version()
+                if not compare_version(running_version, option_version, operand):
+                    flag = doctest.OPTIONFLAGS_BY_NAME['SKIP']
+                    node['options'][flag] = True  # Skip the test
+            except ValueError:
+                self.state.document.reporter.warning(
+                    _("'%s' is not a valid pyversion option") % option,
+                    line=self.lineno)
         return [node]
 
 
@@ -122,12 +168,14 @@ class DoctestDirective(TestDirective):
     option_spec = {
         'hide': directives.flag,
         'options': directives.unchanged,
+        'pyversion': directives.unchanged_required,
     }
 
 
 class TestcodeDirective(TestDirective):
     option_spec = {
         'hide': directives.flag,
+        'pyversion': directives.unchanged_required,
     }
 
 
@@ -135,6 +183,7 @@ class TestoutputDirective(TestDirective):
     option_spec = {
         'hide': directives.flag,
         'options': directives.unchanged,
+        'pyversion': directives.unchanged_required,
     }
 
 

tests/roots/test-doctest/doctest.txt

@@ -69,7 +69,7 @@ Special directives
   >>> squared(2)
   4
 
-* options for testcode/testoutput blocks
+* options for doctest/testcode/testoutput blocks
 
   .. testcode::
      :hide:
@@ -82,6 +82,20 @@ Special directives
 
      Output text.
 
+  .. doctest::
+     :pyversion: >= 2.0
+
+     >>> a = 3
+     >>> a
+     3
+
+  .. doctest::
+     :pyversion: < 2.0
+
+     >>> a = 3
+     >>> a
+     4
+
 * grouping
 
   .. testsetup:: group1

tests/test_ext_doctest.py

@@ -9,6 +9,7 @@
     :license: BSD, see LICENSE for details.
 """
 import pytest
+from sphinx.ext.doctest import compare_version
 
 cleanup_called = 0
 
@@ -25,6 +26,21 @@ def test_build(app, status, warning):
     assert cleanup_called == 3, 'testcleanup did not get executed enough times'
 
 
+def test_compare_version():
+    assert compare_version('3.3', '3.4', '<') is True
+    assert compare_version('3.3', '3.2', '<') is False
+    assert compare_version('3.3', '3.4', '<=') is True
+    assert compare_version('3.3', '3.2', '<=') is False
+    assert compare_version('3.3', '3.3', '==') is True
+    assert compare_version('3.3', '3.4', '==') is False
+    assert compare_version('3.3', '3.2', '>=') is True
+    assert compare_version('3.3', '3.4', '>=') is False
+    assert compare_version('3.3', '3.2', '>') is True
+    assert compare_version('3.3', '3.4', '>') is False
+    with pytest.raises(ValueError):
+        compare_version('3.3', '3.4', '+')
+
+
 def cleanup_call():
     global cleanup_called
     cleanup_called += 1