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117 lines
4.3 KiB
Python
117 lines
4.3 KiB
Python
from functools import partial
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import re
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from .exceptions import UnknownFPSError
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from .ssaevent import SSAEvent
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from .ssastyle import SSAStyle
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from .formatbase import FormatBase
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from .substation import parse_tags
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from .time import ms_to_frames, frames_to_ms
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#: Matches a MicroDVD line.
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MICRODVD_LINE = re.compile(r" *\{ *(\d+) *\} *\{ *(\d+) *\}(.+)")
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class MicroDVDFormat(FormatBase):
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"""MicroDVD subtitle format implementation"""
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@classmethod
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def guess_format(cls, text):
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"""See :meth:`pysubs2.formats.FormatBase.guess_format()`"""
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if any(map(MICRODVD_LINE.match, text.splitlines())):
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return "microdvd"
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@classmethod
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def from_file(cls, subs, fp, format_, fps=None, **kwargs):
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"""See :meth:`pysubs2.formats.FormatBase.from_file()`"""
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for line in fp:
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match = MICRODVD_LINE.match(line)
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if not match:
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continue
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fstart, fend, text = match.groups()
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fstart, fend = map(int, (fstart, fend))
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if fps is None:
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# We don't know the framerate, but it is customary to include
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# it as text of the first subtitle. In that case, we skip
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# this auxiliary subtitle and proceed with reading.
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try:
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fps = float(text)
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subs.fps = fps
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continue
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except ValueError:
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raise UnknownFPSError("Framerate was not specified and "
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"cannot be read from "
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"the MicroDVD file.")
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start, end = map(partial(frames_to_ms, fps=fps), (fstart, fend))
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def prepare_text(text):
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text = text.replace("|", r"\N")
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def style_replacer(match):
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tags = [c for c in "biu" if c in match.group(0)]
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return "{%s}" % "".join(r"\%s1" % c for c in tags)
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text = re.sub(r"\{[Yy]:[^}]+\}", style_replacer, text)
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text = re.sub(r"\{[Ff]:([^}]+)\}", r"{\\fn\1}", text)
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text = re.sub(r"\{[Ss]:([^}]+)\}", r"{\\fs\1}", text)
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text = re.sub(r"\{P:(\d+),(\d+)\}", r"{\\pos(\1,\2)}", text)
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return text.strip()
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ev = SSAEvent(start=start, end=end, text=prepare_text(text))
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subs.append(ev)
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@classmethod
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def to_file(cls, subs, fp, format_, fps=None, write_fps_declaration=True, apply_styles=True, **kwargs):
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"""
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See :meth:`pysubs2.formats.FormatBase.to_file()`
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The only supported styling is marking whole lines italic.
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Keyword args:
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write_fps_declaration: If True, create a zero-duration first subtitle which will contain
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the fps.
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apply_styles: If False, do not write any styling.
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"""
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if fps is None:
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fps = subs.fps
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if fps is None:
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raise UnknownFPSError("Framerate must be specified when writing MicroDVD.")
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to_frames = partial(ms_to_frames, fps=fps)
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def is_entirely_italic(line):
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style = subs.styles.get(line.style, SSAStyle.DEFAULT_STYLE)
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for fragment, sty in parse_tags(line.text, style, subs.styles):
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fragment = fragment.replace(r"\h", " ")
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fragment = fragment.replace(r"\n", "\n")
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fragment = fragment.replace(r"\N", "\n")
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if not sty.italic and fragment and not fragment.isspace():
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return False
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return True
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# insert an artificial first line telling the framerate
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if write_fps_declaration:
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subs.insert(0, SSAEvent(start=0, end=0, text=str(fps)))
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for line in subs:
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if line.is_comment or line.is_drawing:
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continue
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text = "|".join(line.plaintext.splitlines())
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if apply_styles and is_entirely_italic(line):
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text = "{Y:i}" + text
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start, end = map(to_frames, (line.start, line.end))
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# XXX warn on underflow?
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if start < 0: start = 0
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if end < 0: end = 0
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print("{%d}{%d}%s" % (start, end, text), file=fp)
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# remove the artificial framerate-telling line
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if write_fps_declaration:
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subs.pop(0)
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