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annotate python/unroll_deps.py @ 151:f89c3615b414

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this is how its done
author Jeff Hammel <jhammel@mozilla.com>
date Tue, 12 Jul 2011 18:21:48 -0700
parents ef01512b2212
children 8d04ad79ef79
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1 #!/usr/bin/env python
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2
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3 def unroll_dependencies(dependencies):
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4 """unroll dependencies"""
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5 order = []
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6
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7 # unroll the dependencies
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8 for package, deps in dependencies.items():
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9 print package, order
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10 try:
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11 index = order.index(package)
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12 except ValueError:
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13 order.append(package)
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14 index = len(order) - 1
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15 for dep in deps:
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16 try:
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17 dep_index = order.index(dep)
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18 if dep_index > index:
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19 order.insert(dep_index+1, package)
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20 order.pop(index)
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21 index = dep_index
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22 except ValueError:
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23 order.insert(index, dep)
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24 except AssertionError:
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25 print reverse_deps
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26 raise
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27
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28 # ensure no cyclic dependencies
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29 # XXX should do this first
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30 order_dict = dict([(j, i) for i, j in enumerate(order)])
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31 for package, deps in dependencies.items():
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32 index = order_dict[package]
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33 for d in deps:
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34 assert index > order_dict[d], "Cyclic dependencies detected"
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35
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36 return order
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37
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38 if __name__ == '__main__':
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39 deps = {'packageA': set(['packageB', 'packageC', 'packageF']),
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40 'packageB': set(['packageC', 'packageD', 'packageE', 'packageG']),
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41 'packageC': set(['packageE']),
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42 'packageE': set(['packageF', 'packageG']),
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43 'packageF': set(['packageG']),
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44 'packageX': set()}
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45 unrolled = unroll_dependencies(deps)
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46 print unrolled