♻️ REFACTOR: __slots__ for dataclasses (#214)

Author: hukkin

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] = {}

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

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

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