Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/ancestor.py @ 39498:b6a0e06b0f7d

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lazyancestors: extract __iter__ to free function The next patch will keep a reference to the returned iterator in a field, which would otherwise result in a reference cycle. Differential Revision: https://phab.mercurial-scm.org/D4517
author Martin von Zweigbergk <martinvonz@google.com>
date Sun, 09 Sep 2018 23:16:55 -0700
parents 8eb2145ff0fb
children 77a2f6d805f2
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rev   line source
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b1db258e875c Abstract ancestor algorithm into generic function
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1 # ancestor.py - generic DAG ancestor algorithm for mercurial
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2 #
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3 # Copyright 2006 Matt Mackall <mpm@selenic.com>
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4 #
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Martin Geisler <mg@lazybytes.net>
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5 # This software may be used and distributed according to the terms of the
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25e572394f5c Update license to GPLv2+
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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 from __future__ import absolute_import
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9
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10 import heapq
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11
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12 from .node import nullrev
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13 from . import (
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14 pycompat,
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15 )
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16
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17 def commonancestorsheads(pfunc, *nodes):
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18 """Returns a set with the heads of all common ancestors of all nodes,
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19 heads(::nodes[0] and ::nodes[1] and ...) .
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20
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21 pfunc must return a list of parent vertices for a given vertex.
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22 """
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23 if not isinstance(nodes, set):
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24 nodes = set(nodes)
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25 if nullrev in nodes:
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26 return set()
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27 if len(nodes) <= 1:
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28 return nodes
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29
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30 allseen = (1 << len(nodes)) - 1
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31 seen = [0] * (max(nodes) + 1)
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32 for i, n in enumerate(nodes):
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33 seen[n] = 1 << i
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34 poison = 1 << (i + 1)
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35
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36 gca = set()
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37 interesting = len(nodes)
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38 nv = len(seen) - 1
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39 while nv >= 0 and interesting:
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40 v = nv
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41 nv -= 1
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42 if not seen[v]:
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43 continue
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44 sv = seen[v]
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45 if sv < poison:
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46 interesting -= 1
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47 if sv == allseen:
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48 gca.add(v)
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49 sv |= poison
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50 if v in nodes:
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51 # history is linear
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52 return {v}
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53 if sv < poison:
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54 for p in pfunc(v):
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55 sp = seen[p]
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56 if p == nullrev:
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57 continue
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58 if sp == 0:
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59 seen[p] = sv
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60 interesting += 1
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61 elif sp != sv:
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62 seen[p] |= sv
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63 else:
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64 for p in pfunc(v):
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65 if p == nullrev:
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66 continue
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67 sp = seen[p]
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68 if sp and sp < poison:
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69 interesting -= 1
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70 seen[p] = sv
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71 return gca
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72
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73 def ancestors(pfunc, *orignodes):
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74 """
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75 Returns the common ancestors of a and b that are furthest from a
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76 root (as measured by longest path).
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77
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78 pfunc must return a list of parent vertices for a given vertex.
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79 """
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80 def deepest(nodes):
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81 interesting = {}
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82 count = max(nodes) + 1
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83 depth = [0] * count
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84 seen = [0] * count
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85 mapping = []
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86 for (i, n) in enumerate(sorted(nodes)):
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87 depth[n] = 1
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88 b = 1 << i
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89 seen[n] = b
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90 interesting[b] = 1
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91 mapping.append((b, n))
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92 nv = count - 1
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93 while nv >= 0 and len(interesting) > 1:
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94 v = nv
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95 nv -= 1
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96 dv = depth[v]
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97 if dv == 0:
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98 continue
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99 sv = seen[v]
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100 for p in pfunc(v):
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101 if p == nullrev:
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102 continue
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103 dp = depth[p]
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104 nsp = sp = seen[p]
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105 if dp <= dv:
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106 depth[p] = dv + 1
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107 if sp != sv:
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108 interesting[sv] += 1
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109 nsp = seen[p] = sv
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110 if sp:
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111 interesting[sp] -= 1
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112 if interesting[sp] == 0:
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113 del interesting[sp]
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114 elif dv == dp - 1:
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115 nsp = sp | sv
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116 if nsp == sp:
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117 continue
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118 seen[p] = nsp
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119 interesting.setdefault(nsp, 0)
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120 interesting[nsp] += 1
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121 interesting[sp] -= 1
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122 if interesting[sp] == 0:
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123 del interesting[sp]
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124 interesting[sv] -= 1
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125 if interesting[sv] == 0:
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126 del interesting[sv]
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127
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128 if len(interesting) != 1:
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129 return []
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130
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131 k = 0
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132 for i in interesting:
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133 k |= i
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134 return set(n for (i, n) in mapping if k & i)
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135
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136 gca = commonancestorsheads(pfunc, *orignodes)
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137
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138 if len(gca) <= 1:
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139 return gca
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140 return deepest(gca)
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diff changeset
141
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142 class incrementalmissingancestors(object):
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143 '''persistent state used to calculate missing ancestors incrementally
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144
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145 Although similar in spirit to lazyancestors below, this is a separate class
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146 because trying to support contains and missingancestors operations with the
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147 same internal data structures adds needless complexity.'''
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148 def __init__(self, pfunc, bases):
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149 self.bases = set(bases)
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150 if not self.bases:
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151 self.bases.add(nullrev)
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152 self.pfunc = pfunc
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153
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154 def hasbases(self):
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155 '''whether the common set has any non-trivial bases'''
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156 return self.bases and self.bases != {nullrev}
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157
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158 def addbases(self, newbases):
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159 '''grow the ancestor set by adding new bases'''
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160 self.bases.update(newbases)
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161
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162 def removeancestorsfrom(self, revs):
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163 '''remove all ancestors of bases from the set revs (in place)'''
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164 bases = self.bases
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165 pfunc = self.pfunc
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166 revs.difference_update(bases)
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167 # nullrev is always an ancestor
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168 revs.discard(nullrev)
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169 if not revs:
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170 return
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171 # anything in revs > start is definitely not an ancestor of bases
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172 # revs <= start needs to be investigated
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173 start = max(bases)
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174 keepcount = sum(1 for r in revs if r > start)
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175 if len(revs) == keepcount:
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176 # no revs to consider
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177 return
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178
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diff changeset
179 for curr in pycompat.xrange(start, min(revs) - 1, -1):
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180 if curr not in bases:
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diff changeset
181 continue
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182 revs.discard(curr)
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183 bases.update(pfunc(curr))
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184 if len(revs) == keepcount:
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diff changeset
185 # no more potential revs to discard
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186 break
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187
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188 def missingancestors(self, revs):
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189 '''return all the ancestors of revs that are not ancestors of self.bases
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190
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diff changeset
191 This may include elements from revs.
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192
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diff changeset
193 Equivalent to the revset (::revs - ::self.bases). Revs are returned in
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diff changeset
194 revision number order, which is a topological order.'''
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diff changeset
195 revsvisit = set(revs)
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diff changeset
196 basesvisit = self.bases
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197 pfunc = self.pfunc
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diff changeset
198 bothvisit = revsvisit.intersection(basesvisit)
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diff changeset
199 revsvisit.difference_update(bothvisit)
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diff changeset
200 if not revsvisit:
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diff changeset
201 return []
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202
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diff changeset
203 start = max(max(revsvisit), max(basesvisit))
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diff changeset
204 # At this point, we hold the invariants that:
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diff changeset
205 # - revsvisit is the set of nodes we know are an ancestor of at least
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diff changeset
206 # one of the nodes in revs
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diff changeset
207 # - basesvisit is the same for bases
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diff changeset
208 # - bothvisit is the set of nodes we know are ancestors of at least one
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diff changeset
209 # of the nodes in revs and one of the nodes in bases. bothvisit and
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diff changeset
210 # revsvisit are mutually exclusive, but bothvisit is a subset of
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diff changeset
211 # basesvisit.
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diff changeset
212 # Now we walk down in reverse topo order, adding parents of nodes
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diff changeset
213 # already visited to the sets while maintaining the invariants. When a
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diff changeset
214 # node is found in both revsvisit and basesvisit, it is removed from
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diff changeset
215 # revsvisit and added to bothvisit. When revsvisit becomes empty, there
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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diff changeset
216 # are no more ancestors of revs that aren't also ancestors of bases, so
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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diff changeset
217 # exit.
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diff changeset
218
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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diff changeset
219 missing = []
38823
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 38596
diff changeset
220 for curr in pycompat.xrange(start, nullrev, -1):
23334
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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diff changeset
221 if not revsvisit:
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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parents: 23333
diff changeset
222 break
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diff changeset
223
23334
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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diff changeset
224 if curr in bothvisit:
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diff changeset
225 bothvisit.remove(curr)
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diff changeset
226 # curr's parents might have made it into revsvisit through
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diff changeset
227 # another path
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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parents: 23333
diff changeset
228 for p in pfunc(curr):
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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diff changeset
229 revsvisit.discard(p)
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diff changeset
230 basesvisit.add(p)
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diff changeset
231 bothvisit.add(p)
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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diff changeset
232 continue
17970
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diff changeset
233
23334
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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diff changeset
234 if curr in revsvisit:
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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diff changeset
235 missing.append(curr)
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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diff changeset
236 revsvisit.remove(curr)
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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diff changeset
237 thisvisit = revsvisit
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diff changeset
238 othervisit = basesvisit
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parents: 23333
diff changeset
239 elif curr in basesvisit:
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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diff changeset
240 thisvisit = basesvisit
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diff changeset
241 othervisit = revsvisit
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diff changeset
242 else:
23334
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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diff changeset
243 # not an ancestor of revs or bases: ignore
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diff changeset
244 continue
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diff changeset
245
23334
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diff changeset
246 for p in pfunc(curr):
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diff changeset
247 if p == nullrev:
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diff changeset
248 pass
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diff changeset
249 elif p in othervisit or p in bothvisit:
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diff changeset
250 # p is implicitly in thisvisit. This means p is or should be
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diff changeset
251 # in bothvisit
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diff changeset
252 revsvisit.discard(p)
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diff changeset
253 basesvisit.add(p)
59e6e5dd3605 ancestor.missingancestors: turn into a state-keeping class
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parents: 23333
diff changeset
254 bothvisit.add(p)
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parents: 23333
diff changeset
255 else:
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parents: 23333
diff changeset
256 # visit later
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parents: 23333
diff changeset
257 thisvisit.add(p)
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diff changeset
258
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diff changeset
259 missing.reverse()
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diff changeset
260 return missing
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diff changeset
261
39498
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
262 # Extracted from lazyancestors.__iter__ to avoid a reference cycle
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
263 def _lazyancestorsiter(parentrevs, initrevs, stoprev, inclusive):
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
264 seen = {nullrev}
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parents: 39494
diff changeset
265 revs = initrevs
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diff changeset
266
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
267 schedule = heapq.heappush
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parents: 39494
diff changeset
268 nextitem = heapq.heappop
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parents: 39494
diff changeset
269 see = seen.add
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parents: 39494
diff changeset
270
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
271 if inclusive:
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
272 visit = [-r for r in revs]
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
273 seen.update(revs)
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
274 heapq.heapify(visit)
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
275 else:
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
276 visit = []
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
277 heapq.heapify(visit)
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
278 for r in revs:
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
279 for parent in parentrevs(r):
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
280 if parent not in seen:
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
281 schedule(visit, -parent)
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
282 see(parent)
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
283
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
284 while visit:
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
285 current = -nextitem(visit)
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
286 if current >= stoprev:
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
287 yield current
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
288 for parent in parentrevs(current):
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
289 if parent not in seen:
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
290 schedule(visit, -parent)
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
291 see(parent)
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Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
292
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parents: 18079
diff changeset
293 class lazyancestors(object):
23328
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parents: 22225
diff changeset
294 def __init__(self, pfunc, revs, stoprev=0, inclusive=False):
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parents: 18079
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295 """Create a new object generating ancestors for the given revs. Does
9abc55ef85b5 revlog: move ancestor generation out to a new class
Siddharth Agarwal <sid0@fb.com>
parents: 18079
diff changeset
296 not generate revs lower than stoprev.
9abc55ef85b5 revlog: move ancestor generation out to a new class
Siddharth Agarwal <sid0@fb.com>
parents: 18079
diff changeset
297
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diff changeset
298 This is computed lazily starting from revs. The object supports
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
299 iteration and membership.
18090
9abc55ef85b5 revlog: move ancestor generation out to a new class
Siddharth Agarwal <sid0@fb.com>
parents: 18079
diff changeset
300
9abc55ef85b5 revlog: move ancestor generation out to a new class
Siddharth Agarwal <sid0@fb.com>
parents: 18079
diff changeset
301 cl should be a changelog and revs should be an iterable. inclusive is
9abc55ef85b5 revlog: move ancestor generation out to a new class
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parents: 18079
diff changeset
302 a boolean that indicates whether revs should be included. Revs lower
9abc55ef85b5 revlog: move ancestor generation out to a new class
Siddharth Agarwal <sid0@fb.com>
parents: 18079
diff changeset
303 than stoprev will not be generated.
9abc55ef85b5 revlog: move ancestor generation out to a new class
Siddharth Agarwal <sid0@fb.com>
parents: 18079
diff changeset
304
9abc55ef85b5 revlog: move ancestor generation out to a new class
Siddharth Agarwal <sid0@fb.com>
parents: 18079
diff changeset
305 Result does not include the null revision."""
23328
3a7d9c0c57a5 ancestor.lazyancestors: take parentrevs function rather than changelog
Siddharth Agarwal <sid0@fb.com>
parents: 22225
diff changeset
306 self._parentrevs = pfunc
39493
7eadc9407867 ancestor: filter out initial revisions lower than stoprev
Yuya Nishihara <yuya@tcha.org>
parents: 39491
diff changeset
307 self._initrevs = revs = [r for r in revs if r >= stoprev]
18090
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diff changeset
308 self._stoprev = stoprev
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diff changeset
309 self._inclusive = inclusive
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parents: 18079
diff changeset
310
18091
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diff changeset
311 # Initialize data structures for __contains__.
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parents: 18090
diff changeset
312 # For __contains__, we use a heap rather than a deque because
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
313 # (a) it minimizes the number of parentrevs calls made
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parents: 18090
diff changeset
314 # (b) it makes the loop termination condition obvious
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
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parents: 18090
diff changeset
315 # Python's heap is a min-heap. Multiply all values by -1 to convert it
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
316 # into a max-heap.
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
317 self._containsvisit = [-rev for rev in revs]
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parents: 18090
diff changeset
318 heapq.heapify(self._containsvisit)
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
319 if inclusive:
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
320 self._containsseen = set(revs)
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parents: 18090
diff changeset
321 else:
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
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diff changeset
322 self._containsseen = set()
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
323
22225
baecf4e1b7d0 ancestors: add a __nonzero__ method
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 21101
diff changeset
324 def __nonzero__(self):
baecf4e1b7d0 ancestors: add a __nonzero__ method
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 21101
diff changeset
325 """False if the set is empty, True otherwise."""
baecf4e1b7d0 ancestors: add a __nonzero__ method
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 21101
diff changeset
326 try:
29216
ead25aa27a43 py3: convert to next() function
timeless <timeless@mozdev.org>
parents: 25915
diff changeset
327 next(iter(self))
22225
baecf4e1b7d0 ancestors: add a __nonzero__ method
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 21101
diff changeset
328 return True
baecf4e1b7d0 ancestors: add a __nonzero__ method
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 21101
diff changeset
329 except StopIteration:
baecf4e1b7d0 ancestors: add a __nonzero__ method
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 21101
diff changeset
330 return False
baecf4e1b7d0 ancestors: add a __nonzero__ method
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 21101
diff changeset
331
31483
413b44003462 py3: add __bool__ to every class defining __nonzero__
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29216
diff changeset
332 __bool__ = __nonzero__
413b44003462 py3: add __bool__ to every class defining __nonzero__
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29216
diff changeset
333
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parents: 18079
diff changeset
334 def __iter__(self):
9abc55ef85b5 revlog: move ancestor generation out to a new class
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parents: 18079
diff changeset
335 """Generate the ancestors of _initrevs in reverse topological order.
9abc55ef85b5 revlog: move ancestor generation out to a new class
Siddharth Agarwal <sid0@fb.com>
parents: 18079
diff changeset
336
9abc55ef85b5 revlog: move ancestor generation out to a new class
Siddharth Agarwal <sid0@fb.com>
parents: 18079
diff changeset
337 If inclusive is False, yield a sequence of revision numbers starting
39490
b6db2e80a9ce ancestors: actually iterate over ancestors in topological order (issue5979)
Boris Feld <boris.feld@octobus.net>
parents: 38823
diff changeset
338 with the parents of each revision in revs, i.e., each revision is
b6db2e80a9ce ancestors: actually iterate over ancestors in topological order (issue5979)
Boris Feld <boris.feld@octobus.net>
parents: 38823
diff changeset
339 *not* considered an ancestor of itself. Results are emitted in reverse
b6db2e80a9ce ancestors: actually iterate over ancestors in topological order (issue5979)
Boris Feld <boris.feld@octobus.net>
parents: 38823
diff changeset
340 revision number order. That order is also topological: a child is
b6db2e80a9ce ancestors: actually iterate over ancestors in topological order (issue5979)
Boris Feld <boris.feld@octobus.net>
parents: 38823
diff changeset
341 always emitted before its parent.
18090
9abc55ef85b5 revlog: move ancestor generation out to a new class
Siddharth Agarwal <sid0@fb.com>
parents: 18079
diff changeset
342
39491
a60dae060bc8 ancestors: ensure a consistent order even in the "inclusive" case
Boris Feld <boris.feld@octobus.net>
parents: 39490
diff changeset
343 If inclusive is True, the source revisions are also yielded. The
a60dae060bc8 ancestors: ensure a consistent order even in the "inclusive" case
Boris Feld <boris.feld@octobus.net>
parents: 39490
diff changeset
344 reverse revision number order is still enforced."""
39498
b6a0e06b0f7d lazyancestors: extract __iter__ to free function
Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
345 for rev in _lazyancestorsiter(self._parentrevs, self._initrevs,
b6a0e06b0f7d lazyancestors: extract __iter__ to free function
Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
346 self._stoprev, self._inclusive):
b6a0e06b0f7d lazyancestors: extract __iter__ to free function
Martin von Zweigbergk <martinvonz@google.com>
parents: 39494
diff changeset
347 yield rev
18091
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Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
348
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
349 def __contains__(self, target):
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
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parents: 18090
diff changeset
350 """Test whether target is an ancestor of self._initrevs."""
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
351 # Trying to do both __iter__ and __contains__ using the same visit
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
352 # heap and seen set is complex enough that it slows down both. Keep
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
353 # them separate.
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
354 seen = self._containsseen
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
355 if target in seen:
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
356 return True
38596
f8b46245b26a py3: make 'None in lazyancestors' not crash
Yuya Nishihara <yuya@tcha.org>
parents: 32331
diff changeset
357 # Only integer target is valid, but some callers expect 'None in self'
f8b46245b26a py3: make 'None in lazyancestors' not crash
Yuya Nishihara <yuya@tcha.org>
parents: 32331
diff changeset
358 # to be False. So we explicitly allow it.
f8b46245b26a py3: make 'None in lazyancestors' not crash
Yuya Nishihara <yuya@tcha.org>
parents: 32331
diff changeset
359 if target is None:
f8b46245b26a py3: make 'None in lazyancestors' not crash
Yuya Nishihara <yuya@tcha.org>
parents: 32331
diff changeset
360 return False
18091
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
361
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
362 parentrevs = self._parentrevs
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
363 visit = self._containsvisit
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
364 stoprev = self._stoprev
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
365 heappop = heapq.heappop
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
366 heappush = heapq.heappush
25639
7125225a5287 ancestors: prefetch method outside of the loop
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 25113
diff changeset
367 see = seen.add
18091
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
368
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
369 targetseen = False
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
370
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
371 while visit and -visit[0] > target and not targetseen:
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
372 for parent in parentrevs(-heappop(visit)):
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
373 if parent < stoprev or parent in seen:
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
374 continue
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
375 # We need to make sure we push all parents into the heap so
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
376 # that we leave it in a consistent state for future calls.
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
377 heappush(visit, -parent)
25639
7125225a5287 ancestors: prefetch method outside of the loop
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 25113
diff changeset
378 see(parent)
18091
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
379 if parent == target:
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
380 targetseen = True
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
381
f7f8159caad3 ancestor: add lazy membership testing to lazyancestors
Siddharth Agarwal <sid0@fb.com>
parents: 18090
diff changeset
382 return targetseen