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comparison python/unroll_deps.py @ 149:05e461e4b409

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add an unroll-deps example prog
author Jeff Hammel <jhammel@mozilla.com>
date Tue, 12 Jul 2011 13:48:50 -0700
parents
children ef01512b2212
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148:7a4c86310463 149:05e461e4b409
1 #!/usr/bin/env python
2
3 def unroll_dependencies(dependencies):
4 """unroll dependencies"""
5 order = []
6 for package, deps in dependencies.items():
7 try:
8 index = order.index(package)
9 except ValueError:
10 order.append(package)
11 index = len(order) - 1
12 for dep in deps:
13 try:
14 dep_index = order.index(dep)
15 assert dep_index < index, "Cyclic dependencies detected"
16 except ValueError:
17 order.insert(index, dep)
18 return order
19
20 if __name__ == '__main__':
21 deps = {'packageA': set(['packageB', 'packageC']),
22 'packageB': set(['packageC', 'packageD']),
23 'packageC': set()}
24 unrolled = unroll_dependencies(deps)
25 print unrolled