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from abc import ABC, abstractmethod
from io import BytesIO
from pathlib import Path
from typing import Iterable, Optional, Set, Union
from docling_core.types.doc import BoundingBox, Size
from PIL import Image
from docling.backend.abstract_backend import PaginatedDocumentBackend
from docling.datamodel.base_models import Cell, InputFormat
from docling.datamodel.document import InputDocument
class PdfPageBackend(ABC):
@abstractmethod
def get_text_in_rect(self, bbox: BoundingBox) -> str:
pass
@abstractmethod
def get_text_cells(self) -> Iterable[Cell]:
pass
@abstractmethod
def get_bitmap_rects(self, float: int = 1) -> Iterable[BoundingBox]:
pass
@abstractmethod
def get_page_image(
self, scale: float = 1, cropbox: Optional[BoundingBox] = None
) -> Image.Image:
pass
@abstractmethod
def get_size(self) -> Size:
pass
@abstractmethod
def is_valid(self) -> bool:
pass
@abstractmethod
def unload(self):
pass
class PdfDocumentBackend(PaginatedDocumentBackend):
def __init__(self, in_doc: InputDocument, path_or_stream: Union[BytesIO, Path]):
super().__init__(in_doc, path_or_stream)
if self.input_format is not InputFormat.PDF:
if self.input_format is InputFormat.IMAGE:
buf = BytesIO()
img = Image.open(self.path_or_stream)
img.save(buf, "PDF")
buf.seek(0)
self.path_or_stream = buf
else:
raise RuntimeError(
f"Incompatible file format {self.input_format} was passed to a PdfDocumentBackend."
)
@abstractmethod
def load_page(self, page_no: int) -> PdfPageBackend:
pass
@abstractmethod
def page_count(self) -> int:
pass
@classmethod
def supported_formats(cls) -> Set[InputFormat]:
return {InputFormat.PDF}
@classmethod
def supports_pagination(cls) -> bool:
return True
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