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annotate env/lib/python3.7/site-packages/libpasteurize/fixes/feature_base.py @ 3:758bc20232e8 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -0400
parents 26e78fe6e8c4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 u"""
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2 Base classes for features that are backwards-incompatible.
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3
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4 Usage:
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5 features = Features()
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6 features.add(Feature("py3k_feature", "power< 'py3k' any* >", "2.7"))
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7 PATTERN = features.PATTERN
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8 """
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9
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10 pattern_unformatted = u"%s=%s" # name=pattern, for dict lookups
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11 message_unformatted = u"""
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12 %s is only supported in Python %s and above."""
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13
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14 class Feature(object):
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15 u"""
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16 A feature has a name, a pattern, and a minimum version of Python 2.x
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17 required to use the feature (or 3.x if there is no backwards-compatible
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18 version of 2.x)
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19 """
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20 def __init__(self, name, PATTERN, version):
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21 self.name = name
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22 self._pattern = PATTERN
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23 self.version = version
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24
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25 def message_text(self):
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26 u"""
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27 Format the above text with the name and minimum version required.
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28 """
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29 return message_unformatted % (self.name, self.version)
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30
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31 class Features(set):
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32 u"""
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33 A set of features that generates a pattern for the features it contains.
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34 This set will act like a mapping in that we map names to patterns.
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35 """
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36 mapping = {}
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37
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38 def update_mapping(self):
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39 u"""
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40 Called every time we care about the mapping of names to features.
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41 """
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42 self.mapping = dict([(f.name, f) for f in iter(self)])
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43
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44 @property
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45 def PATTERN(self):
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46 u"""
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47 Uses the mapping of names to features to return a PATTERN suitable
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48 for using the lib2to3 patcomp.
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49 """
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50 self.update_mapping()
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51 return u" |\n".join([pattern_unformatted % (f.name, f._pattern) for f in iter(self)])
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52
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53 def __getitem__(self, key):
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54 u"""
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55 Implement a simple mapping to get patterns from names.
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56 """
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57 return self.mapping[key]