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102 lines
3.2 KiB
102 lines
3.2 KiB
# -*- coding: utf-8 -*-
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"""
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SubRip's subtitle parser
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"""
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from pysrt.srtexc import InvalidItem, InvalidIndex
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from pysrt.srttime import SubRipTime
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from pysrt.comparablemixin import ComparableMixin
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from pysrt.compat import str, is_py2
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import re
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class SubRipItem(ComparableMixin):
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"""
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SubRipItem(index, start, end, text, position)
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index -> int: index of item in file. 0 by default.
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start, end -> SubRipTime or coercible.
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text -> unicode: text content for item.
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position -> unicode: raw srt/vtt "display coordinates" string
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"""
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ITEM_PATTERN = str('%s\n%s --> %s%s\n%s\n')
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TIMESTAMP_SEPARATOR = '-->'
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def __init__(self, index=0, start=None, end=None, text='', position=''):
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try:
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self.index = int(index)
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except (TypeError, ValueError): # try to cast as int, but it's not mandatory
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self.index = index
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self.start = SubRipTime.coerce(start or 0)
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self.end = SubRipTime.coerce(end or 0)
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self.position = str(position)
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self.text = str(text)
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@property
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def duration(self):
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return self.end - self.start
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@property
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def text_without_tags(self):
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RE_TAG = re.compile(r'<[^>]*?>')
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return RE_TAG.sub('', self.text)
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@property
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def characters_per_second(self):
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characters_count = len(self.text_without_tags.replace('\n', ''))
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try:
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return characters_count / (self.duration.ordinal / 1000.0)
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except ZeroDivisionError:
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return 0.0
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def __str__(self):
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position = ' %s' % self.position if self.position.strip() else ''
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return self.ITEM_PATTERN % (self.index, self.start, self.end,
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position, self.text)
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if is_py2:
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__unicode__ = __str__
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def __str__(self):
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raise NotImplementedError('Use unicode() instead!')
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def _cmpkey(self):
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return (self.start, self.end)
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def shift(self, *args, **kwargs):
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"""
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shift(hours, minutes, seconds, milliseconds, ratio)
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Add given values to start and end attributes.
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All arguments are optional and have a default value of 0.
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"""
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self.start.shift(*args, **kwargs)
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self.end.shift(*args, **kwargs)
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@classmethod
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def from_string(cls, source):
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return cls.from_lines(source.splitlines(True))
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@classmethod
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def from_lines(cls, lines):
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if len(lines) < 2:
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raise InvalidItem()
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lines = [l.rstrip() for l in lines]
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index = None
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if cls.TIMESTAMP_SEPARATOR not in lines[0]:
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index = lines.pop(0)
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start, end, position = cls.split_timestamps(lines[0])
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body = '\n'.join(lines[1:])
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return cls(index, start, end, body, position)
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@classmethod
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def split_timestamps(cls, line):
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timestamps = line.split(cls.TIMESTAMP_SEPARATOR)
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if len(timestamps) != 2:
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raise InvalidItem()
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start, end_and_position = timestamps
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end_and_position = end_and_position.lstrip().split(' ', 1)
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end = end_and_position[0]
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position = end_and_position[1] if len(end_and_position) > 1 else ''
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return (s.strip() for s in (start, end, position))
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