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# type: ignore
import struct
from io import BytesIO
from typing import AsyncGenerator
import olefile
from core.base.parsers.base_parser import AsyncParser
from core.base.providers import (
CompletionProvider,
DatabaseProvider,
IngestionConfig,
)
class PPTParser(AsyncParser[str | bytes]):
"""A parser for legacy PPT (PowerPoint 97-2003) files."""
def __init__(
self,
config: IngestionConfig,
database_provider: DatabaseProvider,
llm_provider: CompletionProvider,
):
self.database_provider = database_provider
self.llm_provider = llm_provider
self.config = config
self.olefile = olefile
def _extract_text_from_record(self, data: bytes) -> str:
"""Extract text from a PPT text record."""
try:
# Skip record header
text_data = data[8:]
# Convert from UTF-16-LE
return text_data.decode("utf-16-le", errors="ignore").strip()
except Exception:
return ""
async def ingest(
self, data: str | bytes, **kwargs
) -> AsyncGenerator[str, None]:
"""Ingest PPT data and yield text from each slide."""
if isinstance(data, str):
raise ValueError("PPT data must be in bytes format.")
try:
ole = self.olefile.OleFileIO(BytesIO(data))
# PPT stores text in PowerPoint Document stream
if not ole.exists("PowerPoint Document"):
raise ValueError("Not a valid PowerPoint file")
# Read PowerPoint Document stream
ppt_stream = ole.openstream("PowerPoint Document")
content = ppt_stream.read()
# Text records start with 0x0FA0 or 0x0FD0
text_markers = [b"\xa0\x0f", b"\xd0\x0f"]
current_position = 0
while current_position < len(content):
# Look for text markers
for marker in text_markers:
marker_pos = content.find(marker, current_position)
if marker_pos != -1:
# Get record size from header (4 bytes after marker)
size_bytes = content[marker_pos + 2 : marker_pos + 6]
record_size = struct.unpack("<I", size_bytes)[0]
# Extract record data
record_data = content[
marker_pos : marker_pos + record_size + 8
]
text = self._extract_text_from_record(record_data)
if text.strip():
yield text.strip()
current_position = marker_pos + record_size + 8
break
else:
current_position += 1
except Exception as e:
raise ValueError(f"Error processing PPT file: {str(e)}") from e
finally:
ole.close()
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