From 6547c8990ed17264799d15d246ce9875dcaa0a0a Mon Sep 17 00:00:00 2001
From: Taneli Hukkinen <3275109+hukkin@users.noreply.github.com>
Date: Fri, 15 Apr 2022 15:32:46 +0300
Subject: [PATCH] __slots__ for dataclasses

---
 markdown_it/_compat.py                   | 10 ++++++++++
 markdown_it/ruler.py                     |  4 +++-
 markdown_it/rules_inline/state_inline.py |  3 ++-
 markdown_it/token.py                     |  4 +++-
 4 files changed, 18 insertions(+), 3 deletions(-)
 create mode 100644 markdown_it/_compat.py

diff --git a/markdown_it/_compat.py b/markdown_it/_compat.py
new file mode 100644
index 00000000..12df1aa6
--- /dev/null
+++ b/markdown_it/_compat.py
@@ -0,0 +1,10 @@
+from __future__ import annotations
+
+from collections.abc import Mapping
+import sys
+from typing import Any
+
+if sys.version_info >= (3, 10):
+    DATACLASS_KWARGS: Mapping[str, Any] = {"slots": True}
+else:
+    DATACLASS_KWARGS: Mapping[str, Any] = {}
diff --git a/markdown_it/ruler.py b/markdown_it/ruler.py
index b46bac69..11b937a0 100644
--- a/markdown_it/ruler.py
+++ b/markdown_it/ruler.py
@@ -21,6 +21,8 @@ class Ruler
 from dataclasses import dataclass, field
 from typing import TYPE_CHECKING
 
+from markdown_it._compat import DATACLASS_KWARGS
+
 if TYPE_CHECKING:
     from markdown_it import MarkdownIt
 
@@ -50,7 +52,7 @@ def src(self, value: str) -> None:
 RuleFunc = Callable
 
 
-@dataclass()
+@dataclass(**DATACLASS_KWARGS)
 class Rule:
     name: str
     enabled: bool
diff --git a/markdown_it/rules_inline/state_inline.py b/markdown_it/rules_inline/state_inline.py
index 442dac81..283532cc 100644
--- a/markdown_it/rules_inline/state_inline.py
+++ b/markdown_it/rules_inline/state_inline.py
@@ -5,6 +5,7 @@
 from dataclasses import dataclass
 from typing import TYPE_CHECKING
 
+from .._compat import DATACLASS_KWARGS
 from ..common.utils import isMdAsciiPunct, isPunctChar, isWhiteSpace
 from ..ruler import StateBase
 from ..token import Token
@@ -13,7 +14,7 @@
     from markdown_it import MarkdownIt
 
 
-@dataclass()
+@dataclass(**DATACLASS_KWARGS)
 class Delimiter:
     # Char code of the starting marker (number).
     marker: int
diff --git a/markdown_it/token.py b/markdown_it/token.py
index b3c24728..b20875b6 100644
--- a/markdown_it/token.py
+++ b/markdown_it/token.py
@@ -5,6 +5,8 @@
 from typing import Any
 import warnings
 
+from markdown_it._compat import DATACLASS_KWARGS
+
 
 def convert_attrs(value: Any) -> Any:
     """Convert Token.attrs set as ``None`` or ``[[key, value], ...]`` to a dict.
@@ -18,7 +20,7 @@ def convert_attrs(value: Any) -> Any:
     return value
 
 
-@dc.dataclass()
+@dc.dataclass(**DATACLASS_KWARGS)
 class Token:
 
     type: str