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annotate flatten_lines.py @ 319:c58cd7e48db7

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begin to switch settable to TextLineList
author catherine@dellzilla
date Thu, 11 Feb 2010 13:07:05 -0500
parents f44ad8de0d17
children b9f19255d4b7
rev   line source
317
de23e595bb5c experiments with line flattening
cat@eee
parents:
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1 import doctest
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catherine@dellzilla
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2
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3 class TextLineList(list):
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4 '''A list that "wants" to consist of separate lines of text.
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5 Splits multi-line strings and flattens nested lists to
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6 achieve that.
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7 Also omits blank lines, strips leading/trailing whitespace.
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8
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9 >>> tll = TextLineList(['my', 'dog\\nhas', '', [' fleas', 'and\\nticks']])
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10 >>> tll
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11 ['my', 'dog', 'has', 'fleas', 'and', 'ticks']
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12 >>> tll.append(['and', ['spiders', 'and']])
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13 >>> tll
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14 ['my', 'dog', 'has', 'fleas', 'and', 'ticks', 'and', 'spiders', 'and']
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15 >>> tll += 'fish'
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16 >>> tll
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17 ['my', 'dog', 'has', 'fleas', 'and', 'ticks', 'and', 'spiders', 'and', 'fish']
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18 '''
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19 def flattened(self, texts):
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20 result = []
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21 if isinstance(texts, basestring):
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22 result.extend(texts.splitlines())
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23 else:
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24 for text in texts:
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25 result.extend(self.flattened(text))
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26 result = [r.strip() for r in result if r.strip()]
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27 return result
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28 def flatten(self):
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29 list.__init__(self, self.flattened(self))
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30 def __init__(self, values):
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31 list.__init__(self, values)
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32 self.flatten()
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33 def append(self, value):
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34 list.append(self, value)
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35 self.flatten()
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36 def extend(self, values):
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37 list.extend(self, values)
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38 self.flatten()
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39 def __setitem__(self, idx, value):
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40 list.__setitem__(self, idx, value)
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41 self.flatten()
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42 def __iadd__(self, value):
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43 if isinstance(value, basestring):
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44 self.append(value)
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45 else:
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46 list.__iadd__(self, value)
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47 self.flatten()
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48 return self
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49
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50 doctest.testmod()