annotate mercurial/dagutil.py @ 36705:c6901665cd5b

py3: make sure __repr__ returns a str # skip-blame because just r'' prefix Differential Revision: https://phab.mercurial-scm.org/D2652
author Pulkit Goyal <7895pulkit@gmail.com>
date Sun, 04 Mar 2018 22:40:33 +0530
parents f77121b6bf1b
children 0e46b92b37b1
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1 # dagutil.py - dag utilities for mercurial
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2 #
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3 # Copyright 2010 Benoit Boissinot <bboissin@gmail.com>
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4 # and Peter Arrenbrecht <peter@arrenbrecht.ch>
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5 #
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6 # This software may be used and distributed according to the terms of the
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7 # GNU General Public License version 2 or any later version.
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8
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9 from __future__ import absolute_import
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10
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11 from .i18n import _
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12 from .node import nullrev
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13
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14 class basedag(object):
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15 '''generic interface for DAGs
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16
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17 terms:
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18 "ix" (short for index) identifies a nodes internally,
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19 "id" identifies one externally.
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20
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21 All params are ixs unless explicitly suffixed otherwise.
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22 Pluralized params are lists or sets.
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23 '''
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24
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25 def __init__(self):
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26 self._inverse = None
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27
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28 def nodeset(self):
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29 '''set of all node ixs'''
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30 raise NotImplementedError
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31
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32 def heads(self):
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33 '''list of head ixs'''
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34 raise NotImplementedError
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35
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36 def parents(self, ix):
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37 '''list of parents ixs of ix'''
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38 raise NotImplementedError
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39
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40 def inverse(self):
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41 '''inverse DAG, where parents becomes children, etc.'''
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42 raise NotImplementedError
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43
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44 def ancestorset(self, starts, stops=None):
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45 '''
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46 set of all ancestors of starts (incl), but stop walk at stops (excl)
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47 '''
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48 raise NotImplementedError
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49
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50 def descendantset(self, starts, stops=None):
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51 '''
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52 set of all descendants of starts (incl), but stop walk at stops (excl)
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53 '''
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54 return self.inverse().ancestorset(starts, stops)
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55
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56 def headsetofconnecteds(self, ixs):
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57 '''
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58 subset of connected list of ixs so that no node has a descendant in it
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59
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60 By "connected list" we mean that if an ancestor and a descendant are in
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61 the list, then so is at least one path connecting them.
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62 '''
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63 raise NotImplementedError
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64
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65 def externalize(self, ix):
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66 '''return a node id'''
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67 return self._externalize(ix)
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68
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69 def externalizeall(self, ixs):
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70 '''return a list of (or set if given a set) of node ids'''
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71 ids = self._externalizeall(ixs)
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72 if isinstance(ixs, set):
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73 return set(ids)
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74 return list(ids)
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75
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76 def internalize(self, id):
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77 '''return a node ix'''
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78 return self._internalize(id)
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79
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80 def internalizeall(self, ids, filterunknown=False):
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81 '''return a list of (or set if given a set) of node ixs'''
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82 ixs = self._internalizeall(ids, filterunknown)
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83 if isinstance(ids, set):
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84 return set(ixs)
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85 return list(ixs)
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86
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87
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88 class genericdag(basedag):
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89 '''generic implementations for DAGs'''
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90
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91 def ancestorset(self, starts, stops=None):
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92 if stops:
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93 stops = set(stops)
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94 else:
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95 stops = set()
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96 seen = set()
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97 pending = list(starts)
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98 while pending:
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99 n = pending.pop()
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100 if n not in seen and n not in stops:
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101 seen.add(n)
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102 pending.extend(self.parents(n))
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103 return seen
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104
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105 def headsetofconnecteds(self, ixs):
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106 hds = set(ixs)
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107 if not hds:
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108 return hds
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109 for n in ixs:
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110 for p in self.parents(n):
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111 hds.discard(p)
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112 assert hds
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113 return hds
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114
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115
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116 class revlogbaseddag(basedag):
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117 '''generic dag interface to a revlog'''
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118
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119 def __init__(self, revlog, nodeset):
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120 basedag.__init__(self)
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121 self._revlog = revlog
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122 self._heads = None
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123 self._nodeset = nodeset
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124
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125 def nodeset(self):
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126 return self._nodeset
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127
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128 def heads(self):
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129 if self._heads is None:
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130 self._heads = self._getheads()
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131 return self._heads
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132
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133 def _externalize(self, ix):
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134 return self._revlog.index[ix][7]
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135 def _externalizeall(self, ixs):
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136 idx = self._revlog.index
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137 return [idx[i][7] for i in ixs]
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138
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139 def _internalize(self, id):
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140 ix = self._revlog.rev(id)
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141 if ix == nullrev:
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142 raise LookupError(id, self._revlog.indexfile, _('nullid'))
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143 return ix
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144 def _internalizeall(self, ids, filterunknown):
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145 rl = self._revlog
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146 if filterunknown:
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147 return [r for r in map(rl.nodemap.get, ids)
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34d4a037dced discovery: enforce filtering into revlogbaseddag._internalizeall
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 20223
diff changeset
148 if (r is not None
34d4a037dced discovery: enforce filtering into revlogbaseddag._internalizeall
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 20223
diff changeset
149 and r != nullrev
34d4a037dced discovery: enforce filtering into revlogbaseddag._internalizeall
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 20223
diff changeset
150 and r not in rl.filteredrevs)]
34728
09397d0dd3b7 dagutil: use a listcomp instead of a map()
Augie Fackler <augie@google.com>
parents: 25942
diff changeset
151 return [self._internalize(i) for i in ids]
14164
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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152
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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153
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
154 class revlogdag(revlogbaseddag):
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
155 '''dag interface to a revlog'''
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
156
35304
f77121b6bf1b setdiscover: allow to ignore part of the local graph
Boris Feld <boris.feld@octobus.net>
parents: 34728
diff changeset
157 def __init__(self, revlog, localsubset=None):
20223
37e2bd560805 discovery: make revlogdag work on filtered repo
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 16687
diff changeset
158 revlogbaseddag.__init__(self, revlog, set(revlog))
35304
f77121b6bf1b setdiscover: allow to ignore part of the local graph
Boris Feld <boris.feld@octobus.net>
parents: 34728
diff changeset
159 self._heads = localsubset
14164
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
160
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
161 def _getheads(self):
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
162 return [r for r in self._revlog.headrevs() if r != nullrev]
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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163
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
164 def parents(self, ix):
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
165 rlog = self._revlog
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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166 idx = rlog.index
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
167 revdata = idx[ix]
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
168 prev = revdata[5]
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
169 if prev != nullrev:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
170 prev2 = revdata[6]
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
171 if prev2 == nullrev:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
172 return [prev]
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
173 return [prev, prev2]
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
174 prev2 = revdata[6]
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
175 if prev2 != nullrev:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
176 return [prev2]
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
177 return []
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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178
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
179 def inverse(self):
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
180 if self._inverse is None:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
181 self._inverse = inverserevlogdag(self)
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
182 return self._inverse
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
183
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
184 def ancestorset(self, starts, stops=None):
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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185 rlog = self._revlog
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
186 idx = rlog.index
24306
6ddc86eedc3b style: kill ersatz if-else ternary operators
Jordi Gutiérrez Hermoso <jordigh@octave.org>
parents: 23216
diff changeset
187 if stops:
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Jordi Gutiérrez Hermoso <jordigh@octave.org>
parents: 23216
diff changeset
188 stops = set(stops)
6ddc86eedc3b style: kill ersatz if-else ternary operators
Jordi Gutiérrez Hermoso <jordigh@octave.org>
parents: 23216
diff changeset
189 else:
6ddc86eedc3b style: kill ersatz if-else ternary operators
Jordi Gutiérrez Hermoso <jordigh@octave.org>
parents: 23216
diff changeset
190 stops = set()
14164
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
191 seen = set()
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
192 pending = list(starts)
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
193 while pending:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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194 rev = pending.pop()
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
195 if rev not in seen and rev not in stops:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
196 seen.add(rev)
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
197 revdata = idx[rev]
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
198 for i in [5, 6]:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
199 prev = revdata[i]
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
200 if prev != nullrev:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
201 pending.append(prev)
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
202 return seen
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
203
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
204 def headsetofconnecteds(self, ixs):
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
205 if not ixs:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
206 return set()
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
207 rlog = self._revlog
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
208 idx = rlog.index
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
209 headrevs = set(ixs)
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
210 for rev in ixs:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
211 revdata = idx[rev]
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
212 for i in [5, 6]:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
213 prev = revdata[i]
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
214 if prev != nullrev:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
215 headrevs.discard(prev)
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
216 assert headrevs
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
217 return headrevs
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
218
14364
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
219 def linearize(self, ixs):
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Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
220 '''linearize and topologically sort a list of revisions
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
221
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
222 The linearization process tries to create long runs of revs where
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
223 a child rev comes immediately after its first parent. This is done by
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
224 visiting the heads of the given revs in inverse topological order,
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
225 and for each visited rev, visiting its second parent, then its first
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
226 parent, then adding the rev itself to the output list.
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
227 '''
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
228 sorted = []
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Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
229 visit = list(self.headsetofconnecteds(ixs))
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Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
230 visit.sort(reverse=True)
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Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
231 finished = set()
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
232
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
233 while visit:
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
234 cur = visit.pop()
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
235 if cur < 0:
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
236 cur = -cur - 1
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
237 if cur not in finished:
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
238 sorted.append(cur)
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
239 finished.add(cur)
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
240 else:
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
241 visit.append(-cur - 1)
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
242 visit += [p for p in self.parents(cur)
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Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
243 if p in ixs and p not in finished]
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
244 assert len(sorted) == len(ixs)
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
245 return sorted
a3b9f1bddab1 revlogdag: add linearize function
Sune Foldager <cryo@cyanite.org>
parents: 14206
diff changeset
246
14164
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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247
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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248 class inverserevlogdag(revlogbaseddag, genericdag):
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
249 '''inverse of an existing revlog dag; see revlogdag.inverse()'''
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
250
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
251 def __init__(self, orig):
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
252 revlogbaseddag.__init__(self, orig._revlog, orig._nodeset)
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
253 self._orig = orig
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
254 self._children = {}
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
255 self._roots = []
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
256 self._walkfrom = len(self._revlog) - 1
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
257
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
258 def _walkto(self, walkto):
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
259 rev = self._walkfrom
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
260 cs = self._children
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
261 roots = self._roots
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
262 idx = self._revlog.index
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
263 while rev >= walkto:
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
264 data = idx[rev]
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
265 isroot = True
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
266 for prev in [data[5], data[6]]: # parent revs
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
267 if prev != nullrev:
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
268 cs.setdefault(prev, []).append(rev)
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
269 isroot = False
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
270 if isroot:
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
271 roots.append(rev)
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
272 rev -= 1
15052
06c3667c259c dagutil: fix off-by-one in inverserevlogdag buildup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 14634
diff changeset
273 self._walkfrom = rev
14164
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
274
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
275 def _getheads(self):
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
276 self._walkto(nullrev)
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
277 return self._roots
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
278
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
279 def parents(self, ix):
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
280 if ix is None:
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
281 return []
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
282 if ix <= self._walkfrom:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
283 self._walkto(ix)
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
284 return self._children.get(ix, [])
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
285
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
286 def inverse(self):
cb98fed52495 discovery: add new set-based discovery
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff changeset
287 return self._orig