Mercurial > hg
annotate mercurial/ancestor.py @ 25245:504ef9c49f4a
util: allow to specify buffer size in popen4
We will need unbuffered IO to restore real time output with ssh peer.
Changeset ec171737aaf1 seems to indicate playing with this value could be
dangerous, but does not indicate why.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Wed, 20 May 2015 11:29:45 -0500 |
parents | 0ca8410ea345 |
children | 7125225a5287 |
rev | line source |
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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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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 import collections |
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9 import heapq |
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10 from node import nullrev |
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11 |
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12 def commonancestorsheads(pfunc, *nodes): |
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13 """Returns a set with the heads of all common ancestors of all nodes, |
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14 heads(::nodes[0] and ::nodes[1] and ...) . |
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15 |
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16 pfunc must return a list of parent vertices for a given vertex. |
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17 """ |
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18 if not isinstance(nodes, set): |
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19 nodes = set(nodes) |
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20 if nullrev in nodes: |
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21 return set() |
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22 if len(nodes) <= 1: |
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23 return nodes |
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24 |
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25 allseen = (1 << len(nodes)) - 1 |
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26 seen = [0] * (max(nodes) + 1) |
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27 for i, n in enumerate(nodes): |
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28 seen[n] = 1 << i |
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29 poison = 1 << (i + 1) |
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30 |
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31 gca = set() |
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32 interesting = len(nodes) |
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33 nv = len(seen) - 1 |
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34 while nv >= 0 and interesting: |
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35 v = nv |
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36 nv -= 1 |
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37 if not seen[v]: |
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38 continue |
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39 sv = seen[v] |
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40 if sv < poison: |
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41 interesting -= 1 |
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42 if sv == allseen: |
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43 gca.add(v) |
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44 sv |= poison |
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45 if v in nodes: |
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46 # history is linear |
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47 return set([v]) |
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48 if sv < poison: |
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49 for p in pfunc(v): |
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50 sp = seen[p] |
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51 if p == nullrev: |
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52 continue |
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53 if sp == 0: |
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54 seen[p] = sv |
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55 interesting += 1 |
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56 elif sp != sv: |
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57 seen[p] |= sv |
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58 else: |
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59 for p in pfunc(v): |
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60 if p == nullrev: |
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61 continue |
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62 sp = seen[p] |
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63 if sp and sp < poison: |
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64 interesting -= 1 |
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65 seen[p] = sv |
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66 return gca |
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67 |
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68 def ancestors(pfunc, *orignodes): |
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69 """ |
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70 Returns the common ancestors of a and b that are furthest from a |
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71 root (as measured by longest path). |
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72 |
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73 pfunc must return a list of parent vertices for a given vertex. |
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74 """ |
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75 def deepest(nodes): |
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76 interesting = {} |
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77 count = max(nodes) + 1 |
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78 depth = [0] * count |
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79 seen = [0] * count |
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80 mapping = [] |
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81 for (i, n) in enumerate(sorted(nodes)): |
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82 depth[n] = 1 |
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83 b = 1 << i |
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84 seen[n] = b |
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85 interesting[b] = 1 |
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86 mapping.append((b, n)) |
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87 nv = count - 1 |
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88 while nv >= 0 and len(interesting) > 1: |
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89 v = nv |
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90 nv -= 1 |
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91 dv = depth[v] |
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92 if dv == 0: |
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93 continue |
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94 sv = seen[v] |
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95 for p in pfunc(v): |
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96 if p == nullrev: |
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97 continue |
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98 dp = depth[p] |
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99 nsp = sp = seen[p] |
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100 if dp <= dv: |
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101 depth[p] = dv + 1 |
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102 if sp != sv: |
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103 interesting[sv] += 1 |
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104 nsp = seen[p] = sv |
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105 if sp: |
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106 interesting[sp] -= 1 |
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107 if interesting[sp] == 0: |
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108 del interesting[sp] |
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109 elif dv == dp - 1: |
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110 nsp = sp | sv |
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111 if nsp == sp: |
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112 continue |
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113 seen[p] = nsp |
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114 interesting.setdefault(nsp, 0) |
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115 interesting[nsp] += 1 |
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116 interesting[sp] -= 1 |
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117 if interesting[sp] == 0: |
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118 del interesting[sp] |
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119 interesting[sv] -= 1 |
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120 if interesting[sv] == 0: |
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121 del interesting[sv] |
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122 |
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123 if len(interesting) != 1: |
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124 return [] |
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125 |
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126 k = 0 |
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127 for i in interesting: |
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128 k |= i |
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129 return set(n for (i, n) in mapping if k & i) |
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130 |
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131 gca = commonancestorsheads(pfunc, *orignodes) |
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132 |
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133 if len(gca) <= 1: |
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134 return gca |
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135 return deepest(gca) |
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136 |
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137 class incrementalmissingancestors(object): |
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138 '''persistent state used to calculate missing ancestors incrementally |
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139 |
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140 Although similar in spirit to lazyancestors below, this is a separate class |
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141 because trying to support contains and missingancestors operations with the |
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142 same internal data structures adds needless complexity.''' |
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143 def __init__(self, pfunc, bases): |
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144 self.bases = set(bases) |
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145 if not self.bases: |
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146 self.bases.add(nullrev) |
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147 self.pfunc = pfunc |
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148 |
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149 def hasbases(self): |
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150 '''whether the common set has any non-trivial bases''' |
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151 return self.bases and self.bases != set([nullrev]) |
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152 |
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153 def addbases(self, newbases): |
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154 '''grow the ancestor set by adding new bases''' |
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155 self.bases.update(newbases) |
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156 |
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157 def removeancestorsfrom(self, revs): |
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158 '''remove all ancestors of bases from the set revs (in place)''' |
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159 bases = self.bases |
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160 pfunc = self.pfunc |
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161 revs.difference_update(bases) |
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162 # nullrev is always an ancestor |
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163 revs.discard(nullrev) |
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164 if not revs: |
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165 return |
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166 # anything in revs > start is definitely not an ancestor of bases |
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167 # revs <= start needs to be investigated |
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168 start = max(bases) |
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169 keepcount = sum(1 for r in revs if r > start) |
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170 if len(revs) == keepcount: |
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171 # no revs to consider |
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172 return |
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173 |
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174 for curr in xrange(start, min(revs) - 1, -1): |
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175 if curr not in bases: |
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176 continue |
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177 revs.discard(curr) |
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178 bases.update(pfunc(curr)) |
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179 if len(revs) == keepcount: |
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180 # no more potential revs to discard |
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181 break |
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182 |
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183 def missingancestors(self, revs): |
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184 '''return all the ancestors of revs that are not ancestors of self.bases |
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185 |
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186 This may include elements from revs. |
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187 |
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188 Equivalent to the revset (::revs - ::self.bases). Revs are returned in |
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189 revision number order, which is a topological order.''' |
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190 revsvisit = set(revs) |
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191 basesvisit = self.bases |
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192 pfunc = self.pfunc |
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193 bothvisit = revsvisit.intersection(basesvisit) |
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194 revsvisit.difference_update(bothvisit) |
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195 if not revsvisit: |
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196 return [] |
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197 |
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198 start = max(max(revsvisit), max(basesvisit)) |
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199 # At this point, we hold the invariants that: |
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200 # - revsvisit is the set of nodes we know are an ancestor of at least |
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201 # one of the nodes in revs |
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202 # - basesvisit is the same for bases |
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203 # - bothvisit is the set of nodes we know are ancestors of at least one |
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204 # of the nodes in revs and one of the nodes in bases. bothvisit and |
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205 # revsvisit are mutually exclusive, but bothvisit is a subset of |
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206 # basesvisit. |
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207 # Now we walk down in reverse topo order, adding parents of nodes |
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208 # already visited to the sets while maintaining the invariants. When a |
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209 # node is found in both revsvisit and basesvisit, it is removed from |
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210 # revsvisit and added to bothvisit. When revsvisit becomes empty, there |
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211 # are no more ancestors of revs that aren't also ancestors of bases, so |
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212 # exit. |
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213 |
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214 missing = [] |
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215 for curr in xrange(start, nullrev, -1): |
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216 if not revsvisit: |
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217 break |
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218 |
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219 if curr in bothvisit: |
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220 bothvisit.remove(curr) |
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221 # curr's parents might have made it into revsvisit through |
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222 # another path |
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223 for p in pfunc(curr): |
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224 revsvisit.discard(p) |
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225 basesvisit.add(p) |
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226 bothvisit.add(p) |
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227 continue |
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228 |
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229 if curr in revsvisit: |
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230 missing.append(curr) |
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231 revsvisit.remove(curr) |
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232 thisvisit = revsvisit |
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233 othervisit = basesvisit |
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234 elif curr in basesvisit: |
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235 thisvisit = basesvisit |
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236 othervisit = revsvisit |
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237 else: |
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238 # not an ancestor of revs or bases: ignore |
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239 continue |
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240 |
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241 for p in pfunc(curr): |
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242 if p == nullrev: |
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243 pass |
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244 elif p in othervisit or p in bothvisit: |
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245 # p is implicitly in thisvisit. This means p is or should be |
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246 # in bothvisit |
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247 revsvisit.discard(p) |
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248 basesvisit.add(p) |
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249 bothvisit.add(p) |
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250 else: |
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251 # visit later |
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252 thisvisit.add(p) |
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253 |
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254 missing.reverse() |
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255 return missing |
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256 |
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257 class lazyancestors(object): |
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258 def __init__(self, pfunc, revs, stoprev=0, inclusive=False): |
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259 """Create a new object generating ancestors for the given revs. Does |
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260 not generate revs lower than stoprev. |
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261 |
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262 This is computed lazily starting from revs. The object supports |
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263 iteration and membership. |
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264 |
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265 cl should be a changelog and revs should be an iterable. inclusive is |
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266 a boolean that indicates whether revs should be included. Revs lower |
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267 than stoprev will not be generated. |
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268 |
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269 Result does not include the null revision.""" |
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270 self._parentrevs = pfunc |
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271 self._initrevs = revs |
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272 self._stoprev = stoprev |
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273 self._inclusive = inclusive |
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274 |
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275 # Initialize data structures for __contains__. |
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276 # For __contains__, we use a heap rather than a deque because |
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277 # (a) it minimizes the number of parentrevs calls made |
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278 # (b) it makes the loop termination condition obvious |
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279 # Python's heap is a min-heap. Multiply all values by -1 to convert it |
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280 # into a max-heap. |
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281 self._containsvisit = [-rev for rev in revs] |
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282 heapq.heapify(self._containsvisit) |
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283 if inclusive: |
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284 self._containsseen = set(revs) |
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285 else: |
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286 self._containsseen = set() |
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287 |
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288 def __nonzero__(self): |
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289 """False if the set is empty, True otherwise.""" |
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290 try: |
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291 iter(self).next() |
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292 return True |
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293 except StopIteration: |
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294 return False |
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295 |
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296 def __iter__(self): |
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297 """Generate the ancestors of _initrevs in reverse topological order. |
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298 |
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299 If inclusive is False, yield a sequence of revision numbers starting |
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300 with the parents of each revision in revs, i.e., each revision is *not* |
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301 considered an ancestor of itself. Results are in breadth-first order: |
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302 parents of each rev in revs, then parents of those, etc. |
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303 |
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304 If inclusive is True, yield all the revs first (ignoring stoprev), |
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305 then yield all the ancestors of revs as when inclusive is False. |
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306 If an element in revs is an ancestor of a different rev it is not |
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307 yielded again.""" |
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308 seen = set() |
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309 revs = self._initrevs |
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310 if self._inclusive: |
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311 for rev in revs: |
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312 yield rev |
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313 seen.update(revs) |
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314 |
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315 parentrevs = self._parentrevs |
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316 stoprev = self._stoprev |
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317 visit = collections.deque(revs) |
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318 |
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319 while visit: |
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320 for parent in parentrevs(visit.popleft()): |
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321 if parent >= stoprev and parent not in seen: |
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322 visit.append(parent) |
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323 seen.add(parent) |
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324 yield parent |
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325 |
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326 def __contains__(self, target): |
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327 """Test whether target is an ancestor of self._initrevs.""" |
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328 # Trying to do both __iter__ and __contains__ using the same visit |
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329 # heap and seen set is complex enough that it slows down both. Keep |
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330 # them separate. |
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331 seen = self._containsseen |
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332 if target in seen: |
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333 return True |
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334 |
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335 parentrevs = self._parentrevs |
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336 visit = self._containsvisit |
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337 stoprev = self._stoprev |
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338 heappop = heapq.heappop |
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339 heappush = heapq.heappush |
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340 |
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341 targetseen = False |
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342 |
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Siddharth Agarwal <sid0@fb.com>
parents:
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343 while visit and -visit[0] > target and not targetseen: |
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parents:
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344 for parent in parentrevs(-heappop(visit)): |
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Siddharth Agarwal <sid0@fb.com>
parents:
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345 if parent < stoprev or parent in seen: |
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Siddharth Agarwal <sid0@fb.com>
parents:
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346 continue |
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parents:
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347 # We need to make sure we push all parents into the heap so |
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parents:
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348 # that we leave it in a consistent state for future calls. |
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Siddharth Agarwal <sid0@fb.com>
parents:
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349 heappush(visit, -parent) |
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Siddharth Agarwal <sid0@fb.com>
parents:
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350 seen.add(parent) |
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Siddharth Agarwal <sid0@fb.com>
parents:
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351 if parent == target: |
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Siddharth Agarwal <sid0@fb.com>
parents:
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352 targetseen = True |
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parents:
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353 |
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Siddharth Agarwal <sid0@fb.com>
parents:
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354 return targetseen |