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Initial import.
This commit is contained in:
Jeremy Fincher
parent
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ca4ad3882f
105
src/structures.py
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105
src/structures.py
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#!/usr/bin/env python
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###
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# Copyright (c) 2002, Jeremiah Fincher
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions, and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions, and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# * Neither the name of the author of this software nor the name of
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# contributors to this software may be used to endorse or promote products
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# derived from this software without specific prior written consent.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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###
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"""
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Data structures for Python.
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"""
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import types
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__all__ = ['RingBuffer']
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class RingBuffer(object):
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#__slots__ = ('L', 'i')
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def __init__(self, maxSize, seq=()):
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## if not maxSize and seq:
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## maxSize = len(seq)
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if maxSize <= 0:
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raise ValueError, 'maxSize must be > 0.'
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self.i = maxSize
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self.L = []
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for elt in seq:
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self.append(elt)
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def __len__(self):
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return len(self.L)
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def __nonzero__(self):
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return len(self) > 0
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def __contains__(self, elt):
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return elt in self.L
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def append(self, elt):
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if len(self) >= self.i:
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self.__class__ = _FullRingBuffer
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self.i = 0
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self.append(elt)
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else:
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self.L.append(elt)
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def extend(self, seq):
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for elt in seq:
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self.append(elt)
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def __getitem__(self, idx):
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if type(idx) == types.SliceType:
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pass
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else:
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return self.L[idx]
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def __setitem__(self, idx, elt):
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self.L[idx] = elt
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def __repr__(self):
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return 'RingBuffer(%r, %r)' % (self.i, list(self))
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class _FullRingBuffer(RingBuffer):
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#__slots__ = ('L', 'i')
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def append(self, elt):
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self.L[self.i] = elt
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self.i += 1
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self.i %= len(self.L)
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def __getitem__(self, oidx):
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(m, idx) = divmod(oidx, len(self.L))
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if m and m != -1:
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raise IndexError, oidx
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idx = (idx + self.i) % len(self.L)
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return self.L[idx]
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def __setitem__(self, oidx, elt):
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(m, idx) = divmod(oidx, len(self.L))
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if m and m != -1:
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raise IndexError, oidx
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idx = (idx + self.i) % len(self.L)
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self.L[idx] = elt
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def __repr__(self):
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return 'RingBuffer(%r, %r)' % (len(self.L), list(self))
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129
test/test_structures.py
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129
test/test_structures.py
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#!/usr/bin/env python
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###
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# Copyright (c) 2002, Jeremiah Fincher
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions, and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions, and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# * Neither the name of the author of this software nor the name of
|
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# contributors to this software may be used to endorse or promote products
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# derived from this software without specific prior written consent.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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###
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from test import *
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from structures import *
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class RingBufferTestCase(unittest.TestCase):
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def testInit(self):
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self.assertRaises(ValueError, RingBuffer, -1)
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self.assertRaises(ValueError, RingBuffer, 0)
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self.assertEqual(range(10), list(RingBuffer(10, range(10))))
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def testLen(self):
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b = RingBuffer(3)
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self.assertEqual(0, len(b))
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b.append(1)
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self.assertEqual(1, len(b))
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b.append(2)
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self.assertEqual(2, len(b))
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b.append(3)
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self.assertEqual(3, len(b))
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b.append(4)
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self.assertEqual(3, len(b))
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b.append(5)
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self.assertEqual(3, len(b))
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def testNonzero(self):
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b = RingBuffer(3)
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self.failIf(b)
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b.append(1)
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self.failUnless(b)
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def testAppend(self):
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b = RingBuffer(3)
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self.assertEqual([], list(b))
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b.append(1)
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self.assertEqual([1], list(b))
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b.append(2)
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self.assertEqual([1, 2], list(b))
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b.append(3)
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self.assertEqual([1, 2, 3], list(b))
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b.append(4)
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self.assertEqual([2, 3, 4], list(b))
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b.append(5)
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self.assertEqual([3, 4, 5], list(b))
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b.append(6)
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self.assertEqual([4, 5, 6], list(b))
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def testContains(self):
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b = RingBuffer(3, range(3))
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self.failUnless(0 in b)
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self.failUnless(1 in b)
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self.failUnless(2 in b)
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self.failIf(3 in b)
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def testGetitem(self):
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L = range(10)
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b = RingBuffer(len(L), L)
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for i in range(len(b)):
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self.assertEqual(L[i], b[i])
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for i in range(len(b)):
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b.append(i)
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for i in range(len(b)):
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self.assertEqual(L[i], b[i])
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def testSetitem(self):
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L = range(10)
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b = RingBuffer(len(L), [0]*len(L))
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for i in range(len(b)):
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b[i] = i
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for i in range(len(b)):
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self.assertEqual(b[i], i)
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for i in range(len(b)):
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b.append(0)
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for i in range(len(b)):
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b[i] = i
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for i in range(len(b)):
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self.assertEqual(b[i], i)
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def testExtend(self):
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b = RingBuffer(3, range(3))
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self.assertEqual(list(b), range(3))
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b.extend(range(6))
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self.assertEqual(list(b), range(6)[3:])
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def testRepr(self):
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b = RingBuffer(3)
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self.assertEqual(repr(b), 'RingBuffer(3, [])')
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b.append(1)
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self.assertEqual(repr(b), 'RingBuffer(3, [1])')
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b.append(2)
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self.assertEqual(repr(b), 'RingBuffer(3, [1, 2])')
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b.append(3)
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self.assertEqual(repr(b), 'RingBuffer(3, [1, 2, 3])')
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b.append(4)
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self.assertEqual(repr(b), 'RingBuffer(3, [2, 3, 4])')
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b.append(5)
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self.assertEqual(repr(b), 'RingBuffer(3, [3, 4, 5])')
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b.append(6)
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self.assertEqual(repr(b), 'RingBuffer(3, [4, 5, 6])')
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