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annotate mercurial/dicthelpers.py @ 21577:c62c5ce750ee

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revert: group related data in tuple in the dispatch table The dispatch table used to be: - action if in target manifest - action if not in target manifest - make backup if in target manifest - make backup if not in target manifest We turn this into two (action, make backup) tuples. This helps both readability of the dispatch table and handling of each case. This also prepares a refactoring where the different actions we performs, whether "file is in target manifest" or not, are determined before reaching this loop.
author Pierre-Yves David <pierre-yves.david@fb.com>
date Tue, 13 May 2014 17:28:19 -0700
parents ed46c2b98b0d
children
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1 # dicthelpers.py - helper routines for Python dicts
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2 #
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3 # Copyright 2013 Facebook
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 def diff(d1, d2, default=None):
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9 '''Return all key-value pairs that are different between d1 and d2.
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10
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11 This includes keys that are present in one dict but not the other, and
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12 keys whose values are different. The return value is a dict with values
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13 being pairs of values from d1 and d2 respectively, and missing values
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14 treated as default, so if a value is missing from one dict and the same as
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15 default in the other, it will not be returned.'''
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16 res = {}
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17 if d1 is d2:
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18 # same dict, so diff is empty
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19 return res
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20
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21 for k1, v1 in d1.iteritems():
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22 v2 = d2.get(k1, default)
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23 if v1 != v2:
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24 res[k1] = (v1, v2)
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25
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26 for k2 in d2:
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27 if k2 not in d1:
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28 v2 = d2[k2]
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29 if v2 != default:
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30 res[k2] = (default, v2)
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31
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32 return res
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33
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34 def join(d1, d2, default=None):
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35 '''Return all key-value pairs from both d1 and d2.
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36
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37 This is akin to an outer join in relational algebra. The return value is a
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38 dict with values being pairs of values from d1 and d2 respectively, and
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39 missing values represented as default.'''
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40 res = {}
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41
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42 for k1, v1 in d1.iteritems():
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43 if k1 in d2:
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44 res[k1] = (v1, d2[k1])
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45 else:
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46 res[k1] = (v1, default)
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47
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48 if d1 is d2:
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49 return res
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50
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51 for k2 in d2:
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52 if k2 not in d1:
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53 res[k2] = (default, d2[k2])
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54
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55 return res