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95 lines
2.4 KiB
Python
95 lines
2.4 KiB
Python
5 years ago
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import sys
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from collections import deque
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from django.utils.datastructures import SortedDict
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from django.db import models
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from south import exceptions
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class SortedSet(SortedDict):
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def __init__(self, data=tuple()):
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self.extend(data)
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def __str__(self):
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return "SortedSet(%s)" % list(self)
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def add(self, value):
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self[value] = True
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def remove(self, value):
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del self[value]
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def extend(self, iterable):
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[self.add(k) for k in iterable]
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def get_app_label(app):
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"""
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Returns the _internal_ app label for the given app module.
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i.e. for <module django.contrib.auth.models> will return 'auth'
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"""
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return app.__name__.split('.')[-2]
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def app_label_to_app_module(app_label):
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"""
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Given the app label, returns the module of the app itself (unlike models.get_app,
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which returns the models module)
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"""
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# Get the models module
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app = models.get_app(app_label)
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module_name = ".".join(app.__name__.split(".")[:-1])
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try:
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module = sys.modules[module_name]
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except KeyError:
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__import__(module_name, {}, {}, [''])
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module = sys.modules[module_name]
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return module
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def flatten(*stack):
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stack = deque(stack)
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while stack:
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try:
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x = next(stack[0])
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except TypeError:
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stack[0] = iter(stack[0])
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x = next(stack[0])
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except StopIteration:
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stack.popleft()
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continue
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if hasattr(x, '__iter__') and not isinstance(x, str):
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stack.appendleft(x)
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else:
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yield x
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dependency_cache = {}
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def _dfs(start, get_children, path):
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if (start, get_children) in dependency_cache:
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return dependency_cache[(start, get_children)]
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results = []
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if start in path:
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raise exceptions.CircularDependency(path[path.index(start):] + [start])
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path.append(start)
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results.append(start)
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children = sorted(get_children(start), key=lambda x: str(x))
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# We need to apply all the migrations this one depends on
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for n in children:
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results = _dfs(n, get_children, path) + results
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path.pop()
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results = list(SortedSet(results))
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dependency_cache[(start, get_children)] = results
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return results
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def dfs(start, get_children):
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return _dfs(start, get_children, [])
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def depends(start, get_children):
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return dfs(start, get_children)
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