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"""Document loader helpers."""
import concurrent.futures
from typing import NamedTuple, Optional, cast
class FileEncoding(NamedTuple):
"""A file encoding as the NamedTuple."""
encoding: Optional[str]
"""The encoding of the file."""
confidence: float
"""The confidence of the encoding."""
language: Optional[str]
"""The language of the file."""
def detect_file_encodings(file_path: str, timeout: int = 5) -> list[FileEncoding]:
"""Try to detect the file encoding.
Returns a list of `FileEncoding` tuples with the detected encodings ordered
by confidence.
Args:
file_path: The path to the file to detect the encoding for.
timeout: The timeout in seconds for the encoding detection.
"""
import chardet
def read_and_detect(file_path: str) -> list[dict]:
with open(file_path, "rb") as f:
rawdata = f.read()
return cast(list[dict], chardet.detect_all(rawdata))
with concurrent.futures.ThreadPoolExecutor() as executor:
future = executor.submit(read_and_detect, file_path)
try:
encodings = future.result(timeout=timeout)
except concurrent.futures.TimeoutError:
raise TimeoutError(
f"Timeout reached while detecting encoding for {file_path}"
)
if all(encoding["encoding"] is None for encoding in encodings):
raise RuntimeError(f"Could not detect encoding for {file_path}")
return [FileEncoding(**enc) for enc in encodings if enc["encoding"] is not None]
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