mirror of https://github.com/pret/pokecrystal.git
103 lines
3.3 KiB
Python
103 lines
3.3 KiB
Python
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from bisect import bisect_left, bisect_right
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from itertools import izip
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class IntervalMap(object):
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"""
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This class maps a set of intervals to a set of values.
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>>> i = IntervalMap()
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>>> i[0:5] = "hello world"
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>>> i[6:10] = "hello cruel world"
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>>> print i[4]
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"hello world"
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"""
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def __init__(self):
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"""initializes an empty IntervalMap"""
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self._bounds = []
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self._items = []
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self._upperitem = None
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def __setitem__(self, _slice, _value):
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"""sets an interval mapping"""
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assert isinstance(_slice, slice), 'The key must be a slice object'
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if _slice.start is None:
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start_point = -1
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else:
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start_point = bisect_left(self._bounds, _slice.start)
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if _slice.stop is None:
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end_point = -1
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else:
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end_point = bisect_left(self._bounds, _slice.stop)
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if start_point>=0:
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if start_point < len(self._bounds) and self._bounds[start_point]<_slice.start:
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start_point += 1
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if end_point>=0:
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self._bounds[start_point:end_point] = [_slice.start, _slice.stop]
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if start_point < len(self._items):
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self._items[start_point:end_point] = [self._items[start_point], _value]
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else:
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self._items[start_point:end_point] = [self._upperitem, _value]
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else:
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self._bounds[start_point:] = [_slice.start]
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if start_point < len(self._items):
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self._items[start_point:] = [self._items[start_point], _value]
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else:
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self._items[start_point:] = [self._upperitem]
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self._upperitem = _value
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else:
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if end_point>=0:
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self._bounds[:end_point] = [_slice.stop]
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self._items[:end_point] = [_value]
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else:
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self._bounds[:] = []
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self._items[:] = []
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self._upperitem = _value
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def __getitem__(self,_point):
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"""gets a value from the mapping"""
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assert not isinstance(_point, slice), 'The key cannot be a slice object'
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index = bisect_right(self._bounds, _point)
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if index < len(self._bounds):
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return self._items[index]
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else:
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return self._upperitem
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def items(self):
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"""returns an iterator with each item being
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((low_bound, high_bound), value)
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these items are returned in order"""
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previous_bound = None
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for (b, v) in izip(self._bounds, self._items):
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if v is not None:
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yield (previous_bound, b), v
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previous_bound = b
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if self._upperitem is not None:
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yield (previous_bound, None), self._upperitem
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def values(self):
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"""returns an iterator with each item being a stored value
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the items are returned in order"""
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for v in self._items:
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if v is not None:
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yield v
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if self._upperitem is not None:
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yield self._upperitem
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def __repr__(self):
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s = []
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for b,v in self.items():
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if v is not None:
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s.append('[%r, %r] => %r'%(
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b[0],
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b[1],
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v
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))
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return '{'+', '.join(s)+'}'
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