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# Copyright Mercurial Contributors
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import functools
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import stat
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rangemask = 0x7FFFFFFF
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@functools.total_ordering
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class timestamp(tuple):
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"""
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A Unix timestamp with optional nanoseconds precision,
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modulo 2**31 seconds.
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A 2-tuple containing:
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`truncated_seconds`: seconds since the Unix epoch,
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truncated to its lower 31 bits
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`subsecond_nanoseconds`: number of nanoseconds since `truncated_seconds`.
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When this is zero, the sub-second precision is considered unknown.
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"""
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def __new__(cls, value):
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truncated_seconds, subsec_nanos = value
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value = (truncated_seconds & rangemask, subsec_nanos)
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return super(timestamp, cls).__new__(cls, value)
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def __eq__(self, other):
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self_secs, self_subsec_nanos = self
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other_secs, other_subsec_nanos = other
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return self_secs == other_secs and (
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self_subsec_nanos == other_subsec_nanos
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or self_subsec_nanos == 0
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or other_subsec_nanos == 0
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)
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def __gt__(self, other):
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self_secs, self_subsec_nanos = self
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other_secs, other_subsec_nanos = other
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if self_secs > other_secs:
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return True
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if self_secs < other_secs:
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return False
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if self_subsec_nanos == 0 or other_subsec_nanos == 0:
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# they are considered equal, so not "greater than"
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return False
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return self_subsec_nanos > other_subsec_nanos
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def zero():
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"""
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Returns the `timestamp` at the Unix epoch.
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"""
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return tuple.__new__(timestamp, (0, 0))
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def mtime_of(stat_result):
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"""
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Takes an `os.stat_result`-like object and returns a `timestamp` object
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for its modification time.
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"""
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try:
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# TODO: add this attribute to `osutil.stat` objects,
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# see `mercurial/cext/osutil.c`.
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#
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# This attribute is also not available on Python 2.
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nanos = stat_result.st_mtime_ns
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except AttributeError:
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# https://docs.python.org/2/library/os.html#os.stat_float_times
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# "For compatibility with older Python versions,
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# accessing stat_result as a tuple always returns integers."
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secs = stat_result[stat.ST_MTIME]
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subsec_nanos = 0
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else:
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billion = int(1e9)
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secs = nanos // billion
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subsec_nanos = nanos % billion
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return timestamp((secs, subsec_nanos))
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