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annotate python/unroll_deps.py @ 288:498210b6e1a9

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author Jeff Hammel <jhammel@mozilla.com>
date Fri, 10 May 2013 12:36:13 -0700
parents f7cfd58eafe6
children da62e6411ab7
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1 #!/usr/bin/env python
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2
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3 def cycle_check(order, dependencies):
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4 """ensure no cyclic dependencies"""
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5 order_dict = dict([(j, i) for i, j in enumerate(order)])
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6 for package, deps in dependencies.items():
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7 index = order_dict[package]
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8 for d in deps:
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9 assert index > order_dict[d], "Cyclic dependencies detected"
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10
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11
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12 def unroll_dependencies(dependencies):
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13 """unroll dependencies"""
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14 order = []
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15
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16 # unroll the dependencies
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17 for package, deps in dependencies.items():
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18 try:
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19 index = order.index(package)
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20 except ValueError:
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21 order.append(package)
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22 index = len(order) - 1
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23 for dep in deps:
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24 try:
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25 dep_index = order.index(dep)
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26 if dep_index > index:
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27 order.insert(dep_index+1, package)
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28 order.pop(index)
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29 index = dep_index
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30 except ValueError:
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31 order.insert(index, dep)
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32
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33 cycle_check(order, dependencies)
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34 return order
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35
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36 def unroll_dependencies2(dependencies):
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37 """a variation"""
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38 order = []
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39
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40 # flatten all
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41 packages = set(dependencies.keys())
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42 for deps in dependencies.values():
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43 packages.update(deps)
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44
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45 while len(order) != len(packages):
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46
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47 for package in packages.difference(order):
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48 if dependencies.get(package, set()).issubset(order):
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49 order.append(package)
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50 break
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51 else:
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52 raise AssertionError("Cyclic dependencies detected")
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53
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54 cycle_check(order, dependencies)
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55
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56 return order
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57
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58 if __name__ == '__main__':
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59 deps = {'packageA': set(['packageB', 'packageC', 'packageF']),
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60 'packageB': set(['packageC', 'packageD', 'packageE', 'packageG']),
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61 'packageC': set(['packageE']),
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62 'packageE': set(['packageF', 'packageG']),
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63 'packageF': set(['packageG']),
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64 'packageX': set(['packageA', 'packageG'])}
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65 unrolled = unroll_dependencies(deps)
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66 print unrolled
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67
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68 unrolled = unroll_dependencies2(deps)
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69 print unrolled
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70
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71 # ensure cycle check works
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72 deps['packageD'] = set(['packageX'])
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73 try:
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74 unroll_dependencies(deps)
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75 raise Exception("Missed a cyclic dependency!")
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76 except AssertionError:
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77 pass
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78
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79 try:
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80 unroll_dependencies2(deps)
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81 raise Exception("Missed a cyclic dependency!")
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82 except AssertionError:
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83 pass