Mercurial > hg
annotate mercurial/ancestor.py @ 23333:9a2489015592
ancestor.missingancestors: calculate start point after filtering revsvisit
Any revs that are filtered out are also in basesvisit, which means they
wouldn't be returned in the missing list anyway. There's no need to explore
such revs or their ancestors.
The 'if not revsvisit' check moves down because we can't call max() on an empty
set.
author | Siddharth Agarwal <sid0@fb.com> |
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date | Fri, 14 Nov 2014 13:47:25 -0800 |
parents | 194508240dc9 |
children | 59e6e5dd3605 |
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 heapq |
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9 import util |
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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 def missingancestors(revs, bases, pfunc): |
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138 """Return all the ancestors of revs that are not ancestors of bases. |
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139 |
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140 This may include elements from revs. |
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141 |
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142 Equivalent to the revset (::revs - ::bases). Revs are returned in |
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143 revision number order, which is a topological order. |
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144 |
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145 revs and bases should both be iterables. pfunc must return a list of |
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146 parent revs for a given revs. |
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147 """ |
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148 |
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149 revsvisit = set(revs) |
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150 basesvisit = set(bases) |
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151 if not basesvisit: |
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152 basesvisit.add(nullrev) |
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153 bothvisit = revsvisit.intersection(basesvisit) |
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154 revsvisit.difference_update(bothvisit) |
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155 if not revsvisit: |
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156 return [] |
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157 start = max(max(revsvisit), max(basesvisit)) |
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158 # At this point, we hold the invariants that: |
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159 # - revsvisit is the set of nodes we know are an ancestor of at least one |
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160 # of the nodes in revs |
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161 # - basesvisit is the same for bases |
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162 # - bothvisit is the set of nodes we know are ancestors of at least one of |
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163 # the nodes in revs and one of the nodes in bases, and that are smaller |
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164 # than curr. bothvisit and revsvisit are mutually exclusive, but bothvisit |
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165 # is a subset of basesvisit. |
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166 # Now we walk down in reverse topo order, adding parents of nodes already |
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167 # visited to the sets while maintaining the invariants. When a node is found |
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168 # in both revsvisit and basesvisit, it is removed from revsvisit and added |
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169 # to bothvisit. When revsvisit becomes empty, there are no more ancestors of |
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170 # revs that aren't also ancestors of bases, so exit. |
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171 |
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172 missing = [] |
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173 for curr in xrange(start, nullrev, -1): |
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174 if not revsvisit: |
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175 break |
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176 |
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177 if curr in bothvisit: |
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178 bothvisit.remove(curr) |
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179 # curr's parents might have made it into revsvisit through another |
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180 # path |
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181 for p in pfunc(curr): |
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182 revsvisit.discard(p) |
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183 basesvisit.add(p) |
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184 bothvisit.add(p) |
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185 continue |
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186 |
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187 if curr in revsvisit: |
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188 missing.append(curr) |
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189 revsvisit.remove(curr) |
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190 thisvisit = revsvisit |
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191 othervisit = basesvisit |
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192 elif curr in basesvisit: |
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193 thisvisit = basesvisit |
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194 othervisit = revsvisit |
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195 else: |
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196 # not an ancestor of revs or bases: ignore |
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197 continue |
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198 |
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199 for p in pfunc(curr): |
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200 if p == nullrev: |
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201 pass |
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202 elif p in othervisit or p in bothvisit: |
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203 # p is implicitly in thisvisit. This means p is or should be |
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204 # in bothvisit |
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205 revsvisit.discard(p) |
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206 basesvisit.add(p) |
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207 bothvisit.add(p) |
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208 else: |
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209 # visit later |
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210 thisvisit.add(p) |
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211 |
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212 missing.reverse() |
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213 return missing |
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214 |
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215 class lazyancestors(object): |
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216 def __init__(self, pfunc, revs, stoprev=0, inclusive=False): |
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217 """Create a new object generating ancestors for the given revs. Does |
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218 not generate revs lower than stoprev. |
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219 |
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220 This is computed lazily starting from revs. The object supports |
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221 iteration and membership. |
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222 |
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223 cl should be a changelog and revs should be an iterable. inclusive is |
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224 a boolean that indicates whether revs should be included. Revs lower |
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225 than stoprev will not be generated. |
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226 |
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227 Result does not include the null revision.""" |
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228 self._parentrevs = pfunc |
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229 self._initrevs = revs |
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230 self._stoprev = stoprev |
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231 self._inclusive = inclusive |
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232 |
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233 # Initialize data structures for __contains__. |
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234 # For __contains__, we use a heap rather than a deque because |
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235 # (a) it minimizes the number of parentrevs calls made |
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236 # (b) it makes the loop termination condition obvious |
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237 # Python's heap is a min-heap. Multiply all values by -1 to convert it |
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238 # into a max-heap. |
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239 self._containsvisit = [-rev for rev in revs] |
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240 heapq.heapify(self._containsvisit) |
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241 if inclusive: |
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242 self._containsseen = set(revs) |
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243 else: |
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244 self._containsseen = set() |
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245 |
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246 def __nonzero__(self): |
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247 """False if the set is empty, True otherwise.""" |
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248 try: |
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249 iter(self).next() |
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250 return True |
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251 except StopIteration: |
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252 return False |
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253 |
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254 def __iter__(self): |
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255 """Generate the ancestors of _initrevs in reverse topological order. |
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256 |
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257 If inclusive is False, yield a sequence of revision numbers starting |
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258 with the parents of each revision in revs, i.e., each revision is *not* |
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259 considered an ancestor of itself. Results are in breadth-first order: |
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260 parents of each rev in revs, then parents of those, etc. |
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261 |
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262 If inclusive is True, yield all the revs first (ignoring stoprev), |
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263 then yield all the ancestors of revs as when inclusive is False. |
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264 If an element in revs is an ancestor of a different rev it is not |
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265 yielded again.""" |
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266 seen = set() |
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267 revs = self._initrevs |
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268 if self._inclusive: |
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269 for rev in revs: |
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270 yield rev |
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271 seen.update(revs) |
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272 |
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273 parentrevs = self._parentrevs |
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274 stoprev = self._stoprev |
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275 visit = util.deque(revs) |
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276 |
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277 while visit: |
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278 for parent in parentrevs(visit.popleft()): |
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279 if parent >= stoprev and parent not in seen: |
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280 visit.append(parent) |
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281 seen.add(parent) |
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282 yield parent |
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283 |
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284 def __contains__(self, target): |
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285 """Test whether target is an ancestor of self._initrevs.""" |
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286 # Trying to do both __iter__ and __contains__ using the same visit |
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287 # heap and seen set is complex enough that it slows down both. Keep |
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288 # them separate. |
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289 seen = self._containsseen |
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290 if target in seen: |
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291 return True |
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292 |
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293 parentrevs = self._parentrevs |
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294 visit = self._containsvisit |
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295 stoprev = self._stoprev |
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296 heappop = heapq.heappop |
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297 heappush = heapq.heappush |
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298 |
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299 targetseen = False |
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300 |
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301 while visit and -visit[0] > target and not targetseen: |
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302 for parent in parentrevs(-heappop(visit)): |
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303 if parent < stoprev or parent in seen: |
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304 continue |
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305 # We need to make sure we push all parents into the heap so |
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306 # that we leave it in a consistent state for future calls. |
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307 heappush(visit, -parent) |
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308 seen.add(parent) |
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309 if parent == target: |
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310 targetseen = True |
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311 |
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312 return targetseen |