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bazarr/libs/pysubs2/subrip.py

90 lines
3.5 KiB

6 years ago
from __future__ import print_function, unicode_literals
import re
from .formatbase import FormatBase
from .ssaevent import SSAEvent
from .ssastyle import SSAStyle
from .substation import parse_tags
from .time import ms_to_times, make_time, TIMESTAMP, timestamp_to_ms
#: Largest timestamp allowed in SubRip, ie. 99:59:59,999.
MAX_REPRESENTABLE_TIME = make_time(h=100) - 1
def ms_to_timestamp(ms):
"""Convert ms to 'HH:MM:SS,mmm'"""
# XXX throw on overflow/underflow?
if ms < 0: ms = 0
if ms > MAX_REPRESENTABLE_TIME: ms = MAX_REPRESENTABLE_TIME
h, m, s, ms = ms_to_times(ms)
return "%02d:%02d:%02d,%03d" % (h, m, s, ms)
class SubripFormat(FormatBase):
@classmethod
def guess_format(cls, text):
if "[Script Info]" in text or "[V4+ Styles]" in text:
# disambiguation vs. SSA/ASS
return None
for line in text.splitlines():
if len(TIMESTAMP.findall(line)) == 2:
return "srt"
@classmethod
def from_file(cls, subs, fp, format_, **kwargs):
timestamps = [] # (start, end)
following_lines = [] # contains lists of lines following each timestamp
for line in fp:
stamps = TIMESTAMP.findall(line)
if len(stamps) == 2: # timestamp line
start, end = map(timestamp_to_ms, stamps)
timestamps.append((start, end))
following_lines.append([])
else:
if timestamps:
following_lines[-1].append(line)
def prepare_text(lines):
s = "".join(lines).strip()
s = re.sub(r"\n* *\d+ *$", "", s) # strip number of next subtitle
s = re.sub(r"< *i *>", r"{\i1}", s)
s = re.sub(r"< */ *i *>", r"{\i0}", s)
s = re.sub(r"< *s *>", r"{\s1}", s)
s = re.sub(r"< */ *s *>", r"{\s0}", s)
s = re.sub(r"< *u *>", "{\\u1}", s) # not r" for Python 2.7 compat, triggers unicodeescape
s = re.sub(r"< */ *u *>", "{\\u0}", s)
s = re.sub(r"< */? *[a-zA-Z][^>]*>", "", s) # strip other HTML tags
s = re.sub(r"\r", "", s) # convert newlines
s = re.sub(r"\n", r"\N", s) # convert newlines
return s
subs.events = [SSAEvent(start=start, end=end, text=prepare_text(lines))
for (start, end), lines in zip(timestamps, following_lines)]
@classmethod
def to_file(cls, subs, fp, format_, **kwargs):
def prepare_text(text, style):
body = []
for fragment, sty in parse_tags(text, style, subs.styles):
fragment = fragment.replace(r"\h", " ")
fragment = fragment.replace(r"\n", "\n")
fragment = fragment.replace(r"\N", "\n")
if sty.italic: fragment = "<i>%s</i>" % fragment
if sty.underline: fragment = "<u>%s</u>" % fragment
if sty.strikeout: fragment = "<s>%s</s>" % fragment
body.append(fragment)
return re.sub("\n+", "\n", "".join(body).strip())
visible_lines = (line for line in subs if not line.is_comment)
for i, line in enumerate(visible_lines, 1):
start = ms_to_timestamp(line.start)
end = ms_to_timestamp(line.end)
text = prepare_text(line.text, subs.styles.get(line.style, SSAStyle.DEFAULT_STYLE))
print("%d" % i, file=fp) # Python 2.7 compat
print(start, "-->", end, file=fp)
print(text, end="\n\n", file=fp)