Stop parsing from overwriting Sphinx configuration

src/sphinx_autodoc_typehints/__init__.py

@@ -13,21 +13,21 @@
 
 from docutils import nodes
 from docutils.frontend import OptionParser
-from docutils.parsers.rst import Parser as RstParser
-from docutils.parsers.rst import states
-from docutils.utils import new_document
 from sphinx.ext.autodoc.mock import mock
+from sphinx.parsers import RSTParser
 from sphinx.util import logging, rst
 from sphinx.util.inspect import signature as sphinx_signature
 from sphinx.util.inspect import stringify_signature
 
+from .parser import parse
 from .patches import install_patches
 from .version import __version__
 
 if TYPE_CHECKING:
     from ast import FunctionDef, Module, stmt
 
     from docutils.nodes import Node
+    from docutils.parsers.rst import states
     from sphinx.application import Sphinx
     from sphinx.config import Config
     from sphinx.environment import BuildEnvironment
@@ -793,10 +793,9 @@ def get_insert_index(app: Sphinx, lines: list[str]) -> InsertIndexInfo | None:
 
     # 3. Insert after the parameters.
     # To find the parameters, parse as a docutils tree.
-    settings = OptionParser(components=(RstParser,)).get_default_values()
+    settings = OptionParser(components=(RSTParser,)).get_default_values()
     settings.env = app.env
-    doc = new_document("", settings=settings)
-    RstParser().parse("\n".join(lines), doc)
+    doc = parse("\n".join(lines), settings)
 
     # Find a top level child which is a field_list that contains a field whose
     # name starts with one of the PARAM_SYNONYMS. This is the parameter list. We
@@ -915,8 +914,7 @@ def sphinx_autodoc_typehints_type_role(
     """
     unescaped = unescape(text)
     # the typestubs for docutils don't have any info about Inliner
-    doc = new_document("", inliner.document.settings)  # type: ignore[attr-defined]
-    RstParser().parse(unescaped, doc)
+    doc = parse(unescaped, inliner.document.settings)  # type: ignore[attr-defined]
     n = nodes.inline(text)
     n["classes"].append("sphinx_autodoc_typehints-type")
     n += doc.children[0].children

src/sphinx_autodoc_typehints/attributes_patch.py

@@ -7,14 +7,13 @@
 
 import sphinx.domains.python
 import sphinx.ext.autodoc
-from docutils.parsers.rst import Parser as RstParser
-from docutils.utils import new_document
 from sphinx.domains.python import PyAttribute
 from sphinx.ext.autodoc import AttributeDocumenter
 
-if TYPE_CHECKING:
-    from optparse import Values
+from .parser import parse
 
+if TYPE_CHECKING:
+    from docutils.frontend import Values
     from sphinx.addnodes import desc_signature
     from sphinx.application import Sphinx
 
@@ -62,8 +61,7 @@ def add_directive_header(*args: Any, **kwargs: Any) -> Any:
 
 def rst_to_docutils(settings: Values, rst: str) -> Any:
     """Convert rst to a sequence of docutils nodes."""
-    doc = new_document("", settings)
-    RstParser().parse(rst, doc)
+    doc = parse(rst, settings)
     # Remove top level paragraph node so that there is no line break.
     return doc.children[0].children
 

src/sphinx_autodoc_typehints/parser.py

@@ -0,0 +1,25 @@
+"""Utilities for side-effect-free rST parsing."""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from docutils.utils import new_document
+from sphinx.parsers import RSTParser
+from sphinx.util.docutils import sphinx_domains
+
+if TYPE_CHECKING:
+    import optparse
+
+    from docutils import nodes
+    from docutils.frontend import Values
+
+
+def parse(inputstr: str, settings: Values | optparse.Values) -> nodes.document:
+    """Parse inputstr and return a docutils document."""
+    doc = new_document("", settings=settings)
+    with sphinx_domains(settings.env):
+        parser = RSTParser()
+        parser.set_application(settings.env.app)
+        parser.parse(inputstr, doc)
+    return doc

tests/roots/test-dummy/dummy_module_simple_default_role.py

@@ -0,0 +1,10 @@
+from __future__ import annotations
+
+
+def function(x: bool, y: int) -> str:  # noqa: ARG001
+    """
+    Function docstring.
+
+    :param x: `foo`
+    :param y: ``bar``
+    """

tests/roots/test-dummy/simple_default_role.rst

@@ -0,0 +1,4 @@
+Simple Module
+=============
+
+.. autofunction:: dummy_module_simple_default_role.function

tests/test_sphinx_autodoc_typehints.py

@@ -567,6 +567,38 @@ def test_sphinx_output_future_annotations(app: SphinxTestApp, status: StringIO)
     assert contents == expected_contents
 
 
+@pytest.mark.sphinx("pseudoxml", testroot="dummy")
+@patch("sphinx.writers.text.MAXWIDTH", 2000)
+def test_sphinx_output_default_role(app: SphinxTestApp, status: StringIO) -> None:
+    set_python_path()
+
+    app.config.master_doc = "simple_default_role"  # type: ignore[attr-defined] # create flag
+    app.config.default_role = "literal"  # type: ignore[attr-defined]
+    app.build()
+
+    assert "build succeeded" in status.getvalue()  # Build succeeded
+
+    contents_lines = (Path(app.srcdir) / "_build/pseudoxml/simple_default_role.pseudoxml").read_text().splitlines()
+    list_item_idxs = [i for i, line in enumerate(contents_lines) if line.strip() == "<list_item>"]
+    foo_param = dedent("\n".join(contents_lines[list_item_idxs[0] : list_item_idxs[1]]))
+    expected_foo_param = """\
+    <list_item>
+        <paragraph>
+            <literal_strong>
+                x
+             (
+            <inline classes="sphinx_autodoc_typehints-type">
+                <literal classes="xref py py-class">
+                    bool
+            )
+             \N{EN DASH}\N{SPACE}
+            <literal>
+                foo
+    """.rstrip()
+    expected_foo_param = dedent(expected_foo_param)
+    assert foo_param == expected_foo_param
+
+
 @pytest.mark.parametrize(
     ("defaults_config_val", "expected"),
     [