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import re
from .formatbase import FormatBase
from .ssaevent import SSAEvent
from .ssastyle import SSAStyle
from .substation import parse_tags
from .exceptions import ContentNotUsable
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):
"""SubRip Text (SRT) subtitle format implementation"""
TIMESTAMP = TIMESTAMP
@staticmethod
def timestamp_to_ms(groups):
return timestamp_to_ms(groups)
@classmethod
def guess_format(cls, text):
"""See :meth:`pysubs2.formats.FormatBase.guess_format()`"""
if "[Script Info]" in text or "[V4+ Styles]" in text:
# disambiguation vs. SSA/ASS
return None
if text.lstrip().startswith("WEBVTT"):
# disambiguation vs. WebVTT
return None
for line in text.splitlines():
if len(cls.TIMESTAMP.findall(line)) == 2:
return "srt"
@classmethod
def from_file(cls, subs, fp, format_, keep_unknown_html_tags=False, **kwargs):
"""
See :meth:`pysubs2.formats.FormatBase.from_file()`
Supported tags:
- ``<i>``
- ``<u>``
- ``<s>``
Keyword args:
keep_unknown_html_tags: If True, HTML tags other than i/u/s will be kept as-is.
Otherwise, they will be stripped from input.
"""
timestamps = [] # (start, end)
following_lines = [] # contains lists of lines following each timestamp
for line in fp:
stamps = cls.TIMESTAMP.findall(line)
if len(stamps) == 2: # timestamp line
start, end = map(cls.timestamp_to_ms, stamps)
timestamps.append((start, end))
following_lines.append([])
else:
if timestamps:
following_lines[-1].append(line)
def prepare_text(lines):
# Handle the "happy" empty subtitle case, which is timestamp line followed by blank line(s)
# followed by number line and timestamp line of the next subtitle. Fixes issue #11.
if (len(lines) >= 2
and all(re.match("\s*$", line) for line in lines[:-1])
and re.match("\s*\d+\s*$", lines[-1])):
return ""
# Handle the general case.
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)
if not keep_unknown_html_tags:
s = re.sub(r"< */? *[a-zA-Z][^>]*>", "", s) # strip other HTML tags
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_, apply_styles=True, **kwargs):
"""
See :meth:`pysubs2.formats.FormatBase.to_file()`
Italic, underline and strikeout styling is supported.
Keyword args:
apply_styles: If False, do not write any styling.
"""
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 apply_styles:
if sty.italic: fragment = "<i>%s</i>" % fragment
if sty.underline: fragment = "<u>%s</u>" % fragment
if sty.strikeout: fragment = "<s>%s</s>" % fragment
if sty.drawing: raise ContentNotUsable
body.append(fragment)
return re.sub("\n+", "\n", "".join(body).strip())
visible_lines = (line for line in subs if not line.is_comment)
lineno = 1
for line in visible_lines:
start = ms_to_timestamp(line.start)
end = ms_to_timestamp(line.end)
try:
text = prepare_text(line.text, subs.styles.get(line.style, SSAStyle.DEFAULT_STYLE))
except ContentNotUsable:
continue
print("%d" % lineno, file=fp) # Python 2.7 compat
print(start, "-->", end, file=fp)
print(text, end="\n\n", file=fp)
lineno += 1
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