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import re
from typing import List, Sequence, Optional, TextIO, Any
from ..ssaevent import SSAEvent
from .subrip import SubripFormat
from ..time import make_time
from ..ssafile import SSAFile
class WebVTTFormat(SubripFormat):
"""
Web Video Text Tracks (WebVTT) subtitle format implementation
Currently, this shares implementation with :class:`pysubs2.formats.subrip.SubripFormat`.
"""
TIMESTAMP = re.compile(r"(\d{0,4}:)?(\d{2}):(\d{2})\.(\d{2,3})")
@staticmethod
def ms_to_timestamp(ms: int) -> str:
result = SubripFormat.ms_to_timestamp(ms)
return result.replace(',', '.')
@staticmethod
def timestamp_to_ms(groups: Sequence[str]) -> int:
_h, _m, _s, _ms = groups
if not _h:
h = 0
else:
h = int(_h.strip(":"))
m, s, ms = map(int, (_m, _s, _ms))
return make_time(h=h, m=m, s=s, ms=ms)
@classmethod
def guess_format(cls, text: str) -> Optional[str]:
"""See :meth:`pysubs2.formats.FormatBase.guess_format()`"""
if text.lstrip().startswith("WEBVTT"):
return "vtt"
else:
return None
@classmethod
def to_file(cls, subs: "SSAFile", fp: TextIO, format_: str, **kwargs: Any) -> None: # type: ignore[override]
"""
See :meth:`pysubs2.formats.SubripFormat.to_file()`, additional SRT options are supported by VTT as well
"""
print("WEBVTT\n", file=fp)
return super(WebVTTFormat, cls).to_file(
subs=subs, fp=fp, format_=format_, **kwargs)
@classmethod
def _get_visible_lines(cls, subs: "SSAFile") -> List[SSAEvent]:
visible_lines = super()._get_visible_lines(subs)
visible_lines.sort(key=lambda e: e.start)
return visible_lines
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