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# -*- coding: utf-8 -*-
from datetime import timedelta
import logging
from typing import Any, cast, List, Optional
try:
import cchardet
except: # noqa: E722
cchardet = None
try:
import chardet
except: # noqa: E722
chardet = None
try:
import charset_normalizer
except: # noqa: E722
charset_normalizer = None
import pysubs2
from ffsubsync.sklearn_shim import TransformerMixin
import srt
from ffsubsync.constants import (
DEFAULT_ENCODING,
DEFAULT_MAX_SUBTITLE_SECONDS,
DEFAULT_START_SECONDS,
)
from ffsubsync.file_utils import open_file
from ffsubsync.generic_subtitles import GenericSubtitle, GenericSubtitlesFile, SubsMixin
logging.basicConfig(level=logging.INFO)
logger: logging.Logger = logging.getLogger(__name__)
def _preprocess_subs(
subs,
max_subtitle_seconds: Optional[int] = None,
start_seconds: int = 0,
tolerant: bool = True,
) -> List[GenericSubtitle]:
subs_list = []
start_time = timedelta(seconds=start_seconds)
max_duration = timedelta(days=1)
if max_subtitle_seconds is not None:
max_duration = timedelta(seconds=max_subtitle_seconds)
subs = iter(subs)
while True:
try:
next_sub = GenericSubtitle.wrap_inner_subtitle(next(subs))
if next_sub.start < start_time:
continue
next_sub.end = min(next_sub.end, next_sub.start + max_duration)
subs_list.append(next_sub)
# We don't catch SRTParseError here b/c that is typically raised when we
# are trying to parse with the wrong encoding, in which case we might
# be able to try another one on the *entire* set of subtitles elsewhere.
except ValueError as e:
if tolerant:
logger.warning(e)
continue
else:
raise
except StopIteration:
break
return subs_list
class GenericSubtitleParser(SubsMixin, TransformerMixin):
def __init__(
self,
fmt: str = "srt",
encoding: str = "infer",
caching: bool = False,
max_subtitle_seconds: Optional[int] = None,
start_seconds: int = 0,
skip_ssa_info: bool = False,
strict: bool = False,
) -> None:
super(self.__class__, self).__init__()
self.sub_format: str = fmt
self.encoding: str = encoding
self.caching: bool = caching
self.fit_fname: Optional[str] = None
self.detected_encoding_: Optional[str] = None
self.max_subtitle_seconds: Optional[int] = max_subtitle_seconds
self.start_seconds: int = start_seconds
# FIXME: hack to get tests to pass; remove
self._skip_ssa_info: bool = skip_ssa_info
self._strict: bool = strict
def fit(self, fname: str, *_) -> "GenericSubtitleParser":
if self.caching and self.fit_fname == ("<stdin>" if fname is None else fname):
return self
encodings_to_try = (self.encoding,)
with open_file(fname, "rb") as f:
subs = f.read()
if self.encoding == "infer":
for chardet_lib in (cchardet, charset_normalizer, chardet):
if chardet_lib is not None:
try:
detected_encoding = cast(
Optional[str], chardet_lib.detect(subs)["encoding"]
)
except: # noqa: E722
continue
if detected_encoding is not None:
self.detected_encoding_ = detected_encoding
encodings_to_try = (detected_encoding,)
break
assert self.detected_encoding_ is not None
logger.info("detected encoding: %s" % self.detected_encoding_)
exc = None
for encoding in encodings_to_try:
try:
decoded_subs = subs.decode(encoding, errors="replace").strip()
if self.sub_format == "srt":
parsed_subs = srt.parse(
decoded_subs, ignore_errors=not self._strict
)
elif self.sub_format in ("ass", "ssa", "sub"):
parsed_subs = pysubs2.SSAFile.from_string(decoded_subs)
else:
raise NotImplementedError(
"unsupported format: %s" % self.sub_format
)
extra_generic_subtitle_file_kwargs = {}
if isinstance(parsed_subs, pysubs2.SSAFile):
extra_generic_subtitle_file_kwargs.update(
dict(
styles=parsed_subs.styles,
# pysubs2 on Python >= 3.6 doesn't support this
fonts_opaque=getattr(parsed_subs, "fonts_opaque", None),
info=parsed_subs.info if not self._skip_ssa_info else None,
)
)
self.subs_ = GenericSubtitlesFile(
_preprocess_subs(
parsed_subs,
max_subtitle_seconds=self.max_subtitle_seconds,
start_seconds=self.start_seconds,
),
sub_format=self.sub_format,
encoding=encoding,
**extra_generic_subtitle_file_kwargs,
)
self.fit_fname = "<stdin>" if fname is None else fname
if len(encodings_to_try) > 1:
self.detected_encoding_ = encoding
logger.info("detected encoding: %s" % self.detected_encoding_)
return self
except Exception as e:
exc = e
continue
raise exc
def transform(self, *_) -> GenericSubtitlesFile:
return self.subs_
def make_subtitle_parser(
fmt: str,
encoding: str = DEFAULT_ENCODING,
caching: bool = False,
max_subtitle_seconds: int = DEFAULT_MAX_SUBTITLE_SECONDS,
start_seconds: int = DEFAULT_START_SECONDS,
**kwargs: Any,
) -> GenericSubtitleParser:
return GenericSubtitleParser(
fmt=fmt,
encoding=encoding,
caching=caching,
max_subtitle_seconds=max_subtitle_seconds,
start_seconds=start_seconds,
skip_ssa_info=kwargs.get("skip_ssa_info", False),
strict=kwargs.get("strict", False),
)
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