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Parse a marker string and return a dictionary containing a marker expression.
The dictionary will contain keys "op", "lhs" and "rhs" for non-terminals in
the expression grammar, or strings. A string contained in quotes is to be
interpreted as a literal string, and a string not contained in quotes is a
variable (such as os_name).
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Parse a requirement passed in as a string. Return a Container
whose attributes contain the various parts of the requirement.
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Return a list of operator, version tuples if any are
specified, else None.
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'target', or if 'source' exists and 'target' doesn't.
Returns false if both exist and 'target' is the same age or younger
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