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sdiff.py
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sdiff.py
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#!/usr/bin/python
from srt import srt_timestamp_to_timedelta, timedelta_to_srt_timestamp
def compose(start, end, **flags):
'''
Compose sdiff string from `start` and `end` dictionaries.
>>> import datetime
>>> input = ({datetime.timedelta(0, 143, 671000): datetime.timedelta(0, 5, 485000), datetime.timedelta(0, 235, 644000): datetime.timedelta(0, 97, 458000), datetime.timedelta(0, 251, 512000): datetime.timedelta(0, 113, 326000), datetime.timedelta(0, 287, 481000): datetime.timedelta(0, 149, 295000), datetime.timedelta(0, 334, 395000): datetime.timedelta(0, 196, 209000), datetime.timedelta(0, 339, 500000): datetime.timedelta(0, 201, 314000)}, {datetime.timedelta(0, 146, 672000): datetime.timedelta(0, 8, 486000), datetime.timedelta(0, 246, 295000): datetime.timedelta(0, 108, 109000), datetime.timedelta(0, 253, 545000): datetime.timedelta(0, 115, 359000), datetime.timedelta(0, 290, 15000): datetime.timedelta(0, 151, 829000), datetime.timedelta(0, 336, 862000): datetime.timedelta(0, 198, 676000), datetime.timedelta(0, 342, 301000): datetime.timedelta(0, 204, 115000)})
>>> print(compose(*input, flag='Hello'), end='')
:flag Hello
00:02:23,671 --> 00:00:05,485 | 00:02:26,672 --> 00:00:08,486
00:03:55,644 --> 00:01:37,458 | 00:04:06,295 --> 00:01:48,109
00:04:11,512 --> 00:01:53,326 | 00:04:13,545 --> 00:01:55,359
00:04:47,481 --> 00:02:29,295 | 00:04:50,015 --> 00:02:31,829
00:05:34,395 --> 00:03:16,209 | 00:05:36,862 --> 00:03:18,676
00:05:39,500 --> 00:03:21,314 | 00:05:42,301 --> 00:03:24,115
'''
string = ''
for flag, body in flags.items():
string += ':%s %s\n' % (flag, body)
for start_tuple, end_tuple in zip(start.items(), end.items()):
start_sdiff = _compose_sdiff(*start_tuple)
end_sdiff = _compose_sdiff(*end_tuple)
string += '%s | %s\n' % (start_sdiff, end_sdiff)
return string
def parse(string):
'''
Parse `start` and `end` dictionaries from a string in sdiff file fromat.
>>> parse("""
... :flag Hello
...
... 00:02:23,671 --> 00:00:05,485 | 00:02:26,672 --> 00:00:08,486
... 00:03:55,644 --> 00:01:37,458 | 00:04:06,295 --> 00:01:48,109
... 00:04:11,512 --> 00:01:53,326 | 00:04:13,545 --> 00:01:55,359
... 00:04:47,481 --> 00:02:29,295 | 00:04:50,015 --> 00:02:31,829
... 00:05:34,395 --> 00:03:16,209 | 00:05:36,862 --> 00:03:18,676
... 00:05:39,500 --> 00:03:21,314 | 00:05:42,301 --> 00:03:24,115
... """)
({datetime.timedelta(0, 143, 671000): datetime.timedelta(0, 5, 485000), datetime.timedelta(0, 235, 644000): datetime.timedelta(0, 97, 458000), datetime.timedelta(0, 251, 512000): datetime.timedelta(0, 113, 326000), datetime.timedelta(0, 287, 481000): datetime.timedelta(0, 149, 295000), datetime.timedelta(0, 334, 395000): datetime.timedelta(0, 196, 209000), datetime.timedelta(0, 339, 500000): datetime.timedelta(0, 201, 314000)}, {datetime.timedelta(0, 146, 672000): datetime.timedelta(0, 8, 486000), datetime.timedelta(0, 246, 295000): datetime.timedelta(0, 108, 109000), datetime.timedelta(0, 253, 545000): datetime.timedelta(0, 115, 359000), datetime.timedelta(0, 290, 15000): datetime.timedelta(0, 151, 829000), datetime.timedelta(0, 336, 862000): datetime.timedelta(0, 198, 676000), datetime.timedelta(0, 342, 301000): datetime.timedelta(0, 204, 115000)}, {'flag': 'Hello'})
'''
start = []
end = []
flags = {}
header = True
for line in string.split('\n'):
line = line.strip()
if not line:
continue
if header:
if line.startswith('#'):
continue
elif line.startswith(':'):
flag, body = line[1:].split(None, 1)
flags[flag] = body
continue
else:
header = False
start_sdiff, end_sdiff = line.split(' | ')
start.append(_parse_sdiff(start_sdiff))
end.append(_parse_sdiff(end_sdiff))
return (dict(start), dict(end), flags)
def _compose_sdiff(from_time, to_time):
'''
Parse sdiff string to tuple of timedeltas.
>>> from datetime import timedelta
>>> _compose_sdiff(timedelta(1, 5), timedelta(0, 8, 55555))
'24:00:05,000 --> 00:00:08,055'
'''
from_timestamp = timedelta_to_srt_timestamp(from_time)
to_timestamp = timedelta_to_srt_timestamp(to_time)
string = '%s --> %s' % (from_timestamp, to_timestamp)
return string
def _parse_sdiff(sdiff):
'''
Parse sdiff string to tuple of timedeltas.
>>> _parse_sdiff('24:00:05,000 --> 00:00:08,055')
(datetime.timedelta(1, 5), datetime.timedelta(0, 8, 55000))
'''
from_time, to_time = sdiff.split(' --> ')
from_time = srt_timestamp_to_timedelta(from_time)
to_time = srt_timestamp_to_timedelta(to_time)
return (from_time, to_time)
class SDiffError(Exception):
pass
def validate(string):
'''
Validate the format of sdiff string
>>> try:
... validate("""
... # header
... :strip 00:01:50,600
... # random comment
...
... 00:05:34,395 --> 00:03:16,209 | 00:05:36,862 --> 00:03:18,676
... 00:05:39,500 --> 00:03:21,314 | 00:05:42,301 --> 00:03:24,115
... 00:06:37,758 --> 00:04:19,572 | 00:06:41,393 --> 00:04:23,207
... 00:07:13,827 --> 00:04:55,641 | 00:07:15,227 --> 00:04,041
... 00:07:37,618 --> 00:05:19,432 | 00:07:39,017 --> 00:05:20,831
... """)
... except SDiffError as e:
... print(str(e))
...
line 8: Expected timestamp length >= 9, but got 12 (value: 00:04,041)
'''
try:
header = True
for i, line in enumerate(string.split('\n')):
line = line.strip()
if not line:
continue
if header:
if line.startswith('#'):
continue
elif line.startswith(':'):
flag_parts = line.split()
assert len(flag_parts[0]) > 1, 'line %d: Empty flag' % i
assert len(flag_parts) > 1, 'line %d: Empty flag body' % i
continue
else:
header = False
assert ' | ' in line, 'line %d: Missing start/end time separator (" | ")' % i
start, end = line.split(' | ')
assert ' --> ' in start, 'line %d: Missing original/new time separator ' \
'in start time (" --> ")' % i
assert ' --> ' in end, 'line %d: Missing original/new time separator ' \
'in end time (" --> ")' % i
for timestamp in (start.split(' --> ') + end.split(' --> ')):
try:
srt_timestamp_to_timedelta(timestamp)
except ValueError as e:
assert False, 'line %d: %s' % (i, e)
except AssertionError as e:
raise SDiffError(str(e))