1 files changed, 0 insertions, 90 deletions
diff --git a/sphinx/transforms/post_transforms/compat.py b/sphinx/transforms/post_transforms/compat.py
deleted file mode 100644
index 67b67f8d4..000000000
--- a/sphinx/transforms/post_transforms/compat.py
+++ /dev/null
@@ -1,90 +0,0 @@
-"""
-    sphinx.transforms.post_transforms.compat
-    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-    Post transforms for compatibility
-
-    :copyright: Copyright 2007-2019 by the Sphinx team, see AUTHORS.
-    :license: BSD, see LICENSE for details.
-"""
-
-import warnings
-
-from docutils import nodes
-from docutils.writers.docutils_xml import XMLTranslator
-
-from sphinx.addnodes import math_block, displaymath
-from sphinx.deprecation import RemovedInSphinx30Warning
-from sphinx.transforms import SphinxTransform
-from sphinx.util import logging
-
-if False:
-    # For type annotation
-    from typing import Any, Dict  # NOQA
-    from sphinx.application import Sphinx  # NOQA
-
-logger = logging.getLogger(__name__)
-
-
-class MathNodeMigrator(SphinxTransform):
-    """Migrate a math node to docutils'.
-
-    For a long time, Sphinx uses an original node for math. Since 1.8,
-    Sphinx starts to use a math node of docutils'.  This transform converts
-    old and new nodes to keep compatibility.
-    """
-    default_priority = 999
-
-    def apply(self, **kwargs):
-        # type: (Any) -> None
-        for math_node in self.document.traverse(nodes.math):
-            # case: old styled ``math`` node generated by old extensions
-            if len(math_node) == 0:
-                warnings.warn("math node for Sphinx was replaced by docutils'. "
-                              "Please use ``docutils.nodes.math`` instead.",
-                              RemovedInSphinx30Warning)
-                equation = math_node['latex']
-                math_node += nodes.Text(equation, equation)
-
-        translator = self.app.builder.get_translator_class()
-        if hasattr(translator, 'visit_displaymath') and translator != XMLTranslator:
-            # case: old translators which does not support ``math_block`` node
-            warnings.warn("Translator for %s does not support math_block node'. "
-                          "Please update your extension." % translator,
-                          RemovedInSphinx30Warning)
-            for old_math_block_node in self.document.traverse(math_block):
-                alt = displaymath(latex=old_math_block_node.astext(),
-                                  number=old_math_block_node.get('number'),
-                                  label=old_math_block_node.get('label'),
-                                  nowrap=old_math_block_node.get('nowrap'),
-                                  docname=old_math_block_node.get('docname'))
-                old_math_block_node.replace_self(alt)
-        elif getattr(self.app.builder, 'math_renderer_name', None) == 'unknown':
-            # case: math extension provides old styled math renderer
-            for math_block_node in self.document.traverse(nodes.math_block):
-                math_block_node['latex'] = math_block_node.astext()
-
-        # case: old styled ``displaymath`` node generated by old extensions
-        for math_block_node in self.document.traverse(math_block):
-            if len(math_block_node) == 0:
-                warnings.warn("math node for Sphinx was replaced by docutils'. "
-                              "Please use ``docutils.nodes.math_block`` instead.",
-                              RemovedInSphinx30Warning)
-                if isinstance(math_block_node, displaymath):
-                    newnode = nodes.math_block('', math_block_node['latex'],
-                                               **math_block_node.attributes)
-                    math_block_node.replace_self(newnode)
-                else:
-                    latex = math_block_node['latex']
-                    math_block_node += nodes.Text(latex, latex)
-
-
-def setup(app):
-    # type: (Sphinx) -> Dict[str, Any]
-    app.add_post_transform(MathNodeMigrator)
-
-    return {
-        'version': 'builtin',
-        'parallel_read_safe': True,
-        'parallel_write_safe': True,
-    }