refactor: Remove lists of transforms from SphinxStandalonReader

7 files changed, 98 insertions, 24 deletions

diff --git a/sphinx/application.py b/sphinx/application.py
index 887eae86c..dcd143712 100644
--- a/sphinx/application.py
+++ b/sphinx/application.py
@@ -91,11 +91,16 @@ builtin_extensions = (
     'sphinx.parsers',
     'sphinx.registry',
     'sphinx.roles',
+    'sphinx.transforms',
+    'sphinx.transforms.compact_bullet_list',
+    'sphinx.transforms.i18n',
+    'sphinx.transforms.references',
     'sphinx.transforms.post_transforms',
     'sphinx.transforms.post_transforms.code',
     'sphinx.transforms.post_transforms.images',
     'sphinx.transforms.post_transforms.compat',
     'sphinx.util.compat',
+    'sphinx.versioning',
     # collectors should be loaded by specific order
     'sphinx.environment.collectors.dependencies',
     'sphinx.environment.collectors.asset',
diff --git a/sphinx/io.py b/sphinx/io.py
index 00fc2bf1a..f6162b024 100644
--- a/sphinx/io.py
+++ b/sphinx/io.py
@@ -20,17 +20,12 @@ from docutils.writers import UnfilteredWriter
 
 from sphinx.deprecation import RemovedInSphinx30Warning
 from sphinx.transforms import (
-    ApplySourceWorkaround, ExtraTranslatableNodes, SmartQuotesSkipper, CitationReferences,
-    DefaultSubstitutions, MoveModuleTargets, HandleCodeBlocks, SortIds, FigureAligner,
-    AutoNumbering, AutoIndexUpgrader, FilterSystemMessages,
-    UnreferencedFootnotesDetector, SphinxSmartQuotes, DoctreeReadEvent, ManpageLink
+    AutoIndexUpgrader, DoctreeReadEvent, FigureAligner, SphinxTransformer
 )
-from sphinx.transforms import SphinxTransformer
-from sphinx.transforms.compact_bullet_list import RefOnlyBulletListTransform
 from sphinx.transforms.i18n import (
     PreserveTranslatableMessages, Locale, RemoveTranslatableInline,
 )
-from sphinx.transforms.references import SphinxDomains, SubstitutionDefinitionsRemover
+from sphinx.transforms.references import SphinxDomains
 from sphinx.util import logging
 from sphinx.util import UnicodeDecodeErrorHandler
 from sphinx.util.docutils import LoggingReporter
@@ -93,13 +88,6 @@ class SphinxStandaloneReader(SphinxBaseReader):
     """
     A basic document reader for Sphinx.
     """
-    transforms = [ApplySourceWorkaround, ExtraTranslatableNodes, PreserveTranslatableMessages,
-                  Locale, CitationReferences, DefaultSubstitutions, MoveModuleTargets,
-                  HandleCodeBlocks, AutoNumbering, AutoIndexUpgrader, SortIds, FigureAligner,
-                  RemoveTranslatableInline, FilterSystemMessages, RefOnlyBulletListTransform,
-                  UnreferencedFootnotesDetector, SphinxSmartQuotes, ManpageLink,
-                  SphinxDomains, SubstitutionDefinitionsRemover, DoctreeReadEvent,
-                  UIDTransform, SmartQuotesSkipper]
 
     def __init__(self, app, *args, **kwargs):
         # type: (Sphinx, Any, Any) -> None
@@ -136,12 +124,17 @@ class SphinxI18nReader(SphinxBaseReader):
     Because the translated texts are partial and they don't have correct line numbers.
     """
 
-    transforms = [ApplySourceWorkaround, ExtraTranslatableNodes, CitationReferences,
-                  DefaultSubstitutions, MoveModuleTargets, HandleCodeBlocks,
-                  AutoNumbering, SortIds, RemoveTranslatableInline,
-                  FilterSystemMessages, RefOnlyBulletListTransform,
-                  UnreferencedFootnotesDetector, SphinxSmartQuotes, ManpageLink,
-                  SubstitutionDefinitionsRemover, SmartQuotesSkipper]
+    def __init__(self, app, *args, **kwargs):
+        # type: (Sphinx, Any, Any) -> None
+        self.transforms = self.transforms + app.registry.get_transforms()
+        unused = [PreserveTranslatableMessages, Locale, RemoveTranslatableInline,
+                  AutoIndexUpgrader, FigureAligner, SphinxDomains, DoctreeReadEvent,
+                  UIDTransform]
+        for transform in unused:
+            if transform in self.transforms:
+                self.transforms.remove(transform)
+
+        super().__init__(app, *args, **kwargs)
 
     def set_lineno_for_reporter(self, lineno):
         # type: (int) -> None
diff --git a/sphinx/transforms/__init__.py b/sphinx/transforms/__init__.py
index dd7a4c04f..158feafcb 100644
--- a/sphinx/transforms/__init__.py
+++ b/sphinx/transforms/__init__.py
@@ -29,7 +29,7 @@ from sphinx.util.nodes import (
 
 if False:
     # For type annotation
-    from typing import Any, Generator, List, Tuple  # NOQA
+    from typing import Any, Dict, Generator, List, Tuple  # NOQA
     from sphinx.application import Sphinx  # NOQA
     from sphinx.config import Config  # NOQA
     from sphinx.domain.std import StandardDomain  # NOQA
@@ -438,3 +438,29 @@ class ManpageLink(SphinxTransform):
             if r:
                 info = r.groupdict()
             node.attributes.update(info)
+
+
+def setup(app):
+    # type: (Sphinx) -> Dict[str, Any]
+    app.add_transform(ApplySourceWorkaround)
+    app.add_transform(ExtraTranslatableNodes)
+    app.add_transform(SmartQuotesSkipper)
+    app.add_transform(CitationReferences)
+    app.add_transform(DefaultSubstitutions)
+    app.add_transform(MoveModuleTargets)
+    app.add_transform(HandleCodeBlocks)
+    app.add_transform(SortIds)
+    app.add_transform(FigureAligner)
+    app.add_transform(AutoNumbering)
+    app.add_transform(AutoIndexUpgrader)
+    app.add_transform(FilterSystemMessages)
+    app.add_transform(UnreferencedFootnotesDetector)
+    app.add_transform(SphinxSmartQuotes)
+    app.add_transform(DoctreeReadEvent)
+    app.add_transform(ManpageLink)
+
+    return {
+        'version': 'builtin',
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }
diff --git a/sphinx/transforms/compact_bullet_list.py b/sphinx/transforms/compact_bullet_list.py
index 7f7db5c40..e118e6a84 100644
--- a/sphinx/transforms/compact_bullet_list.py
+++ b/sphinx/transforms/compact_bullet_list.py
@@ -17,7 +17,8 @@ from sphinx.transforms import SphinxTransform
 
 if False:
     # For type annotation
-    from typing import Any, List  # NOQA
+    from typing import Any, Dict, List  # NOQA
+    from sphinx.application import Sphinx  # NOQA
 
 
 class RefOnlyListChecker(nodes.GenericNodeVisitor):
@@ -90,3 +91,14 @@ class RefOnlyBulletListTransform(SphinxTransform):
                     compact_para = addnodes.compact_paragraph()
                     compact_para += ref
                     item.replace(para, compact_para)
+
+
+def setup(app):
+    # type: (Sphinx) -> Dict[str, Any]
+    app.add_transform(RefOnlyBulletListTransform)
+
+    return {
+        'version': 'builtin',
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }
diff --git a/sphinx/transforms/i18n.py b/sphinx/transforms/i18n.py
index c8628c318..c884bb89d 100644
--- a/sphinx/transforms/i18n.py
+++ b/sphinx/transforms/i18n.py
@@ -483,3 +483,16 @@ class RemoveTranslatableInline(SphinxTransform):
         for inline in self.document.traverse(matcher):  # type: nodes.inline
             inline.parent.remove(inline)
             inline.parent += inline.children
+
+
+def setup(app):
+    # type: (Sphinx) -> Dict[str, Any]
+    app.add_transform(PreserveTranslatableMessages)
+    app.add_transform(Locale)
+    app.add_transform(RemoveTranslatableInline)
+
+    return {
+        'version': 'builtin',
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }
diff --git a/sphinx/transforms/references.py b/sphinx/transforms/references.py
index fd7e71779..de512f437 100644
--- a/sphinx/transforms/references.py
+++ b/sphinx/transforms/references.py
@@ -15,7 +15,8 @@ from sphinx.transforms import SphinxTransform
 
 if False:
     # For type annotation
-    from typing import Any  # NOQA
+    from typing import Any, Dict  # NOQA
+    from sphinx.application import Sphinx  # NOQA
 
 
 class SubstitutionDefinitionsRemover(SphinxTransform):
@@ -38,3 +39,15 @@ class SphinxDomains(SphinxTransform):
         # type: (Any) -> None
         for domain in self.env.domains.values():
             domain.process_doc(self.env, self.env.docname, self.document)
+
+
+def setup(app):
+    # type: (Sphinx) -> Dict[str, Any]
+    app.add_transform(SubstitutionDefinitionsRemover)
+    app.add_transform(SphinxDomains)
+
+    return {
+        'version': 'builtin',
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }
diff --git a/sphinx/versioning.py b/sphinx/versioning.py
index d69720c57..c98d166bc 100644
--- a/sphinx/versioning.py
+++ b/sphinx/versioning.py
@@ -20,8 +20,9 @@ from sphinx.transforms import SphinxTransform
 
 if False:
     # For type annotation
-    from typing import Any, Iterator  # NOQA
+    from typing import Any, Dict, Iterator  # NOQA
     from docutils import nodes  # NOQA
+    from sphinx.application import Sphinx  # NOQA
 
 try:
     import Levenshtein
@@ -186,3 +187,14 @@ def prepare(document):
                   RemovedInSphinx30Warning, stacklevel=2)
     transform = UIDTransform(document)
     transform.apply()
+
+
+def setup(app):
+    # type: (Sphinx) -> Dict[str, Any]
+    app.add_transform(UIDTransform)
+
+    return {
+        'version': 'builtin',
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }