75 lines
2.3 KiB
Python
75 lines
2.3 KiB
Python
"""SCons.Sig.TimeStamp
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The TimeStamp signature package for the SCons software construction
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utility.
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"""
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#
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# Copyright (c) 2001, 2002, 2003, 2004 The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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__revision__ = "/home/scons/scons/branch.0/baseline/src/engine/SCons/Sig/TimeStamp.py 0.96.1.D001 2004/08/23 09:55:29 knight"
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def current(new, old):
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"""Return whether a new timestamp is up-to-date with
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respect to an old timestamp.
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"""
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return not old is None and new <= old
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def collect(signatures):
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"""
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Collect a list of timestamps, returning
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the most-recent timestamp from the list
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signatures - a list of timestamps
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returns - the most recent timestamp
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"""
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if len(signatures) == 0:
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return 0
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elif len(signatures) == 1:
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return signatures[0]
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else:
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return max(signatures)
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def signature(obj):
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"""Generate a timestamp.
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"""
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return obj.get_timestamp()
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def to_string(signature):
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"""Convert a timestamp to a string"""
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return str(signature)
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def from_string(string):
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"""Convert a string to a timestamp"""
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try:
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return int(string)
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except ValueError:
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# if the signature isn't an int, then
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# the user probably just switched from
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# MD5 signatures to timestamp signatures,
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# so ignore the error:
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return None
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