fix: update SlidePlaceholder to inherit from Shape and enhance value handling in SlideLayoutProxy

Author: ya7010

src/tppt/pptx/shape/placeholder.py

@@ -7,10 +7,10 @@
 from tppt.pptx.presentation import PptxConvertible
 from tppt.types._length import Length
 
-from . import BaseShape
+from . import Shape
 
 
-class SlidePlaceholder(BaseShape[PptxSlidePlaceholder]):
+class SlidePlaceholder(Shape[PptxSlidePlaceholder]):
     def __init__(self, pptx_obj: PptxSlidePlaceholder) -> None:
         self._pptx = pptx_obj
 

src/tppt/template/slide_layout.py

@@ -1,3 +1,4 @@
+import datetime
 from typing import (
     TYPE_CHECKING,
     Annotated,
@@ -14,6 +15,8 @@
     overload,
 )
 
+from tppt.exception import InvalidSetterTypeError
+
 if TYPE_CHECKING:
     from ..pptx.slide import SlideBuilder
     from ..pptx.slide_layout import SlideLayout as PptxConvertibleSlideLayout
@@ -152,6 +155,16 @@ def placeholder_registry(slide: Slide):
             for placeholder, value in zip(
                 slide.placeholders, get_placeholders(self._slide_layout).values()
             ):
+                match value:
+                    case None:
+                        continue
+                    case str():
+                        pass
+                    case datetime.date():
+                        value = value.strftime("%Y%m/%d")
+                    case _:
+                        raise InvalidSetterTypeError(str, type(value))
+
                 placeholder.text = value
 
         return SlideBuilder(