robotools · benkiel · Oct 29, 2024 · Jul 22, 2024 · Jul 22, 2024 · Jul 29, 2024
diff --git a/Lib/fontParts/base/annotations.py b/Lib/fontParts/base/annotations.py
@@ -0,0 +1,47 @@
+# pylint: disable=C0103, C0114
+
+from __future__ import annotations
+from typing import Dict, List, Protocol, Tuple, TypeVar, Union
+
+from fontTools.pens.basePen import AbstractPen
+from fontTools.pens.pointPen import AbstractPointPen
+
+# ------------
+# Type Aliases
+# ------------
+
+# Builtins
+
+T = TypeVar('T')
+CollectionType = Union[List[T], Tuple[T, ...]]
+IntFloatType = Union[int, float]
+
+# FontTools
+
+PenType = AbstractPen
+PointPenType = AbstractPointPen
+
+# FontParts
+
+BoundsType = Tuple[IntFloatType, IntFloatType, IntFloatType, IntFloatType]
+CharacterMappingType = Dict[int, Tuple[str, ...]]
+ColorType = Tuple[IntFloatType, IntFloatType, IntFloatType, IntFloatType]
+CoordinateType = Tuple[IntFloatType, IntFloatType]
+FactorType = Union[IntFloatType, Tuple[IntFloatType, IntFloatType]]
+InterpolatableType = TypeVar('InterpolatableType', bound='Interpolatable')
+KerningKeyType = Tuple[str, str]
+KerningDictType = Dict[KerningKeyType, IntFloatType]
+ReverseComponentMappingType = Dict[str, Tuple[str, ...]]
+ScaleType = Tuple[IntFloatType, IntFloatType]
+TransformationMatrixType = Tuple[
+    IntFloatType, IntFloatType, IntFloatType,
+    IntFloatType, IntFloatType, IntFloatType
+]
+
+
+class Interpolatable(Protocol):
+    """Represent a protocol for interpolatable types."""
+
+    def __add__(self, other: InterpolatableType) -> InterpolatableType: ...
+    def __sub__(self, other: InterpolatableType) -> InterpolatableType: ...
+    def __mul__(self, other: FactorType) -> InterpolatableType: ...