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d | �d t �} g | D] \ } } | ^ qj S( s Get order for installation of requirements in RequirementSet.
The returned list contains a requirement before another that depends on
it. This helps ensure that the environment is kept consistent as they
get installed one-by-one.
The current implementation creates a topological ordering of the
dependency graph, while breaking any cycles in the graph at arbitrary
points. We make no guarantees about where the cycle would be broken,
other than they would be broken.
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^c si t � � i � � � � � f d � � � d � � d d k sG t � t � � t � � k se t � � S( s� Assign weights to each node based on how "deep" they are.
This implementation may change at any point in the future without prior
notice.
We take the length for the longest path to any node from root, ignoring any
paths that contain a single node twice (i.e. cycles). This is done through
a depth-first search through the graph, while keeping track of the path to
the node.
Cycles in the graph result would result in node being revisited while also
being it's own path. In this case, take no action. This helps ensure we
don't get stuck in a cycle.
When assigning weight, the longer path (i.e. larger length) is preferred.
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c C s t | d � } | | | f S( s) Key function used to sort install requirements for installation.
Based on the "weight" mapping calculated in ``get_installation_order()``.
The canonical package name is returned as the second member as a tie-
breaker to ensure the result is predictable, which is useful in tests.
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