Fixes for Sphinx v4

.github/workflows/unit_tests.yml

@@ -6,18 +6,18 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
+        python-version: [3.6, 3.7, 3.8, 3.9]
         sphinx-version:
           - 3.0.4
           - 3.1.2
           - 3.2.1
           - 3.3.1
           - 3.4.3
-          - 3.5.0
-          - git+https://github.com/sphinx-doc/sphinx.git@3.5.x
-          - git+https://github.com/sphinx-doc/sphinx.git@3.x
-          # master (Sphinx 4) will require at least Python 3.6, so disable it for now
-          #- git+https://github.com/sphinx-doc/sphinx.git@master
+          - 3.5.4
+          - git+https://github.com/sphinx-doc/sphinx.git@4.0.x
+          # enable 4.x again when 4.0.x has been merged into it
+          #- git+https://github.com/sphinx-doc/sphinx.git@4.x
+          - git+https://github.com/sphinx-doc/sphinx.git@master
 
     steps:
       - uses: actions/checkout@v2

breathe/renderer/sphinxrenderer.py

@@ -1,3 +1,5 @@
+import sphinx
+
 from breathe.parser import DoxygenCompoundParser
 from breathe.project import ProjectInfo
 from breathe.renderer import RenderContext
@@ -667,10 +669,23 @@ def content(contentnode):
         assert declarator is not None
         if display_obj_type is not None:
             n = declarator[0]
-            assert isinstance(n, addnodes.desc_annotation)
-            assert n.astext()[-1] == " "
-            txt = display_obj_type + ' '
-            declarator[0] = addnodes.desc_annotation(txt, txt)
+            newStyle = True
+            # the new style was introduced in Sphinx v4
+            if sphinx.version_info[0] < 4:
+                newStyle = False
+            # but only for the C and C++ domains
+            if self.get_domain() and self.get_domain() not in ('c', 'cpp'):
+                newStyle = False
+            if newStyle:
+                # TODO: remove the "type: ignore" when Sphinx >= 4 is required
+                assert isinstance(n, addnodes.desc_sig_keyword)  # type: ignore
+                declarator[0] = addnodes.desc_sig_keyword(  # type: ignore
+                    display_obj_type, display_obj_type)
+            else:
+                assert isinstance(n, addnodes.desc_annotation)
+                assert n.astext()[-1] == " "
+                txt = display_obj_type + ' '
+                declarator[0] = addnodes.desc_annotation(txt, txt)
         if not self.app.env.config.breathe_debug_trace_doxygen_ids:
             target = self.create_doxygen_target(node)
         declarator.insert(0, target)
@@ -1162,6 +1177,7 @@ def render_signature(file_data, doxygen_target, name, kind):
 
             rst_node.document = self.state.document
             rst_node['objtype'] = kind
+            rst_node['domain'] = self.get_domain() if self.get_domain() else 'cpp'
 
             contentnode = addnodes.desc_content()
             rst_node.append(contentnode)
@@ -1700,6 +1716,7 @@ def visit_docxrefsect(self, node) -> List[Node]:
 
         descnode = addnodes.desc()
         descnode['objtype'] = 'xrefsect'
+        descnode['domain'] = self.get_domain() if self.get_domain() else 'cpp'
         descnode += signode
         descnode += contentnode
 
@@ -1710,6 +1727,7 @@ def visit_docvariablelist(self, node) -> List[Node]:
         for varlistentry, listitem in zip(node.varlistentries, node.listitems):
             descnode = addnodes.desc()
             descnode['objtype'] = 'varentry'
+            descnode['domain'] = self.get_domain() if self.get_domain() else 'cpp'
             signode = addnodes.desc_signature()
             signode += self.render_optional(varlistentry)
             descnode += signode
@@ -1995,6 +2013,7 @@ def visit_friendclass(self, node) -> List[Node]:
 
         desc = addnodes.desc()
         desc['objtype'] = 'friendclass'
+        desc['domain'] = self.get_domain() if self.get_domain() else 'cpp'
         signode = addnodes.desc_signature()
         desc += signode
 

requirements/production.txt

@@ -2,5 +2,5 @@ docutils>=0.12
 Jinja2>=2.7.3
 MarkupSafe>=0.23
 Pygments>=1.6
-Sphinx>=3.0,<3.6
+Sphinx>=3.0,<5
 six>=1.9.0

setup.py

@@ -14,10 +14,10 @@
  render `Doxygen <http://www.doxygen.org>`__ xml output.
 '''
 
-requires = ['Sphinx>=3.0,<3.6', 'docutils>=0.12', 'six>=1.9']
+requires = ['Sphinx>=3.0,<5', 'docutils>=0.12', 'six>=1.9']
 
-if sys.version_info < (3, 5):
-    print('ERROR: Sphinx requires at least Python 3.5 to run.')
+if sys.version_info < (3, 6):
+    print('ERROR: Sphinx requires at least Python 3.6 to run.')
     sys.exit(1)
 
 

tests/test_renderer.py

@@ -288,11 +288,21 @@ def test_render_func(app):
                                   param=[WrappedParam(type_=WrappedLinkedText(content_=[WrappedMixedContainer(value=u'int')]))])
     signature = find_node(render(app, member_def), 'desc_signature')
     assert signature.astext().startswith('void')
-    assert find_node(signature, 'desc_name')[0] == 'foo'
+    if sphinx.version_info[0] < 4:
+        assert find_node(signature, 'desc_name')[0] == 'foo'
+    else:
+        n = find_node(signature, 'desc_name')[0]
+        assert isinstance(n, sphinx.addnodes.desc_sig_name)
+        assert len(n) == 1
+        assert n[0] == 'foo'
     params = find_node(signature, 'desc_parameterlist')
     assert len(params) == 1
     param = params[0]
-    assert param[0] == 'int'
+    if sphinx.version_info[0] < 4:
+        assert param[0] == 'int'
+    else:
+        assert isinstance(param[0], sphinx.addnodes.desc_sig_keyword_type)
+        assert param[0][0] == 'int'
 
 
 def test_render_typedef(app):
@@ -312,10 +322,15 @@ def test_render_c_function_typedef(app):
                                   type_='void* (*', name='voidFuncPtr', argsstring=')(float, int)')
     signature = find_node(render(app, member_def, domain='c'), 'desc_signature')
     assert signature.astext().startswith('typedef void *')
-    params = find_node(signature, 'desc_parameterlist')
-    assert len(params) == 2
-    assert params[0].astext() == "float"
-    assert params[1].astext() == "int"
+    if sphinx.version_info[0] < 4:
+        params = find_node(signature, 'desc_parameterlist')
+        assert len(params) == 2
+        assert params[0].astext() == "float"
+        assert params[1].astext() == "int"
+    else:
+        # the use of desc_parameterlist in this case was not correct,
+        # it should only be used for a top-level function
+        pass
 
 
 def test_render_using_alias(app):