Mercurial > hg
annotate mercurial/ancestor.py @ 18365:4148414da120
obsolete: process markers in a stable order
Using set iteration order gave unstable debugsuccessorssets output with
PYTHONHASHSEED=random.
author | Mads Kiilerich <mads@kiilerich.com> |
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date | Tue, 15 Jan 2013 02:59:13 +0100 |
parents | f7f8159caad3 |
children | 2f7186400a07 |
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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, util |
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9 from node import nullrev |
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10 |
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11 def ancestor(a, b, pfunc): |
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12 """ |
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13 Returns the common ancestor of a and b that is furthest from a |
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14 root (as measured by longest path) or None if no ancestor is |
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15 found. If there are multiple common ancestors at the same |
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16 distance, the first one found is returned. |
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17 |
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18 pfunc must return a list of parent vertices for a given vertex |
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19 """ |
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20 |
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21 if a == b: |
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22 return a |
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23 |
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24 a, b = sorted([a, b]) |
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25 |
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26 # find depth from root of all ancestors |
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27 # depth is stored as a negative for heapq |
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28 parentcache = {} |
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29 visit = [a, b] |
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30 depth = {} |
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31 while visit: |
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32 vertex = visit[-1] |
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33 pl = pfunc(vertex) |
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34 parentcache[vertex] = pl |
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35 if not pl: |
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36 depth[vertex] = 0 |
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37 visit.pop() |
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38 else: |
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39 for p in pl: |
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40 if p == a or p == b: # did we find a or b as a parent? |
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41 return p # we're done |
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42 if p not in depth: |
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43 visit.append(p) |
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44 if visit[-1] == vertex: |
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45 # -(maximum distance of parents + 1) |
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46 depth[vertex] = min([depth[p] for p in pl]) - 1 |
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47 visit.pop() |
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48 |
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49 # traverse ancestors in order of decreasing distance from root |
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50 def ancestors(vertex): |
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51 h = [(depth[vertex], vertex)] |
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52 seen = set() |
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53 while h: |
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54 d, n = heapq.heappop(h) |
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55 if n not in seen: |
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56 seen.add(n) |
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57 yield (d, n) |
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58 for p in parentcache[n]: |
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59 heapq.heappush(h, (depth[p], p)) |
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60 |
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61 def generations(vertex): |
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62 sg, s = None, set() |
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63 for g, v in ancestors(vertex): |
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64 if g != sg: |
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65 if sg: |
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66 yield sg, s |
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67 sg, s = g, set((v,)) |
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68 else: |
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69 s.add(v) |
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70 yield sg, s |
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71 |
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72 x = generations(a) |
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73 y = generations(b) |
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74 gx = x.next() |
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75 gy = y.next() |
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76 |
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77 # increment each ancestor list until it is closer to root than |
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78 # the other, or they match |
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79 try: |
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80 while True: |
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81 if gx[0] == gy[0]: |
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82 for v in gx[1]: |
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83 if v in gy[1]: |
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84 return v |
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85 gy = y.next() |
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86 gx = x.next() |
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87 elif gx[0] > gy[0]: |
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88 gy = y.next() |
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89 else: |
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90 gx = x.next() |
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91 except StopIteration: |
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92 return None |
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93 |
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94 def missingancestors(revs, bases, pfunc): |
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95 """Return all the ancestors of revs that are not ancestors of bases. |
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96 |
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97 This may include elements from revs. |
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98 |
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99 Equivalent to the revset (::revs - ::bases). Revs are returned in |
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100 revision number order, which is a topological order. |
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101 |
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102 revs and bases should both be iterables. pfunc must return a list of |
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103 parent revs for a given revs. |
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104 """ |
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105 |
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106 revsvisit = set(revs) |
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107 basesvisit = set(bases) |
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108 if not revsvisit: |
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109 return [] |
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110 if not basesvisit: |
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111 basesvisit.add(nullrev) |
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112 start = max(max(revsvisit), max(basesvisit)) |
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113 bothvisit = revsvisit.intersection(basesvisit) |
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114 revsvisit.difference_update(bothvisit) |
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115 basesvisit.difference_update(bothvisit) |
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116 # At this point, we hold the invariants that: |
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117 # - revsvisit is the set of nodes we know are an ancestor of at least one |
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118 # of the nodes in revs |
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119 # - basesvisit is the same for bases |
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120 # - bothvisit is the set of nodes we know are ancestors of at least one of |
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121 # the nodes in revs and one of the nodes in bases |
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122 # - a node may be in none or one, but not more, of revsvisit, basesvisit |
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123 # and bothvisit at any given time |
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124 # Now we walk down in reverse topo order, adding parents of nodes already |
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125 # visited to the sets while maintaining the invariants. When a node is |
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126 # found in both revsvisit and basesvisit, it is removed from them and |
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127 # added to bothvisit instead. When revsvisit becomes empty, there are no |
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128 # more ancestors of revs that aren't also ancestors of bases, so exit. |
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129 |
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130 missing = [] |
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131 for curr in xrange(start, nullrev, -1): |
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132 if not revsvisit: |
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133 break |
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134 |
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135 if curr in bothvisit: |
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136 bothvisit.remove(curr) |
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137 # curr's parents might have made it into revsvisit or basesvisit |
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138 # through another path |
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139 for p in pfunc(curr): |
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140 revsvisit.discard(p) |
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141 basesvisit.discard(p) |
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142 bothvisit.add(p) |
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143 continue |
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144 |
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145 # curr will never be in both revsvisit and basesvisit, since if it |
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146 # were it'd have been pushed to bothvisit |
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147 if curr in revsvisit: |
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148 missing.append(curr) |
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149 thisvisit = revsvisit |
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150 othervisit = basesvisit |
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151 elif curr in basesvisit: |
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152 thisvisit = basesvisit |
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153 othervisit = revsvisit |
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154 else: |
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155 # not an ancestor of revs or bases: ignore |
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156 continue |
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157 |
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158 thisvisit.remove(curr) |
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159 for p in pfunc(curr): |
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160 if p == nullrev: |
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161 pass |
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162 elif p in othervisit or p in bothvisit: |
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163 # p is implicitly in thisvisit. This means p is or should be |
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164 # in bothvisit |
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165 revsvisit.discard(p) |
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166 basesvisit.discard(p) |
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167 bothvisit.add(p) |
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168 else: |
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169 # visit later |
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170 thisvisit.add(p) |
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171 |
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172 missing.reverse() |
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173 return missing |
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174 |
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175 class lazyancestors(object): |
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176 def __init__(self, cl, revs, stoprev=0, inclusive=False): |
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177 """Create a new object generating ancestors for the given revs. Does |
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178 not generate revs lower than stoprev. |
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179 |
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180 This is computed lazily starting from revs. The object supports |
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181 iteration and membership. |
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182 |
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183 cl should be a changelog and revs should be an iterable. inclusive is |
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184 a boolean that indicates whether revs should be included. Revs lower |
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185 than stoprev will not be generated. |
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186 |
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187 Result does not include the null revision.""" |
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188 self._parentrevs = cl.parentrevs |
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189 self._initrevs = revs |
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190 self._stoprev = stoprev |
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191 self._inclusive = inclusive |
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192 |
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193 # Initialize data structures for __contains__. |
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194 # For __contains__, we use a heap rather than a deque because |
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195 # (a) it minimizes the number of parentrevs calls made |
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196 # (b) it makes the loop termination condition obvious |
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197 # Python's heap is a min-heap. Multiply all values by -1 to convert it |
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198 # into a max-heap. |
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199 self._containsvisit = [-rev for rev in revs] |
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200 heapq.heapify(self._containsvisit) |
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201 if inclusive: |
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202 self._containsseen = set(revs) |
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203 else: |
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204 self._containsseen = set() |
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205 |
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206 def __iter__(self): |
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207 """Generate the ancestors of _initrevs in reverse topological order. |
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208 |
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209 If inclusive is False, yield a sequence of revision numbers starting |
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210 with the parents of each revision in revs, i.e., each revision is *not* |
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211 considered an ancestor of itself. Results are in breadth-first order: |
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212 parents of each rev in revs, then parents of those, etc. |
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213 |
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214 If inclusive is True, yield all the revs first (ignoring stoprev), |
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215 then yield all the ancestors of revs as when inclusive is False. |
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216 If an element in revs is an ancestor of a different rev it is not |
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217 yielded again.""" |
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218 seen = set() |
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219 revs = self._initrevs |
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220 if self._inclusive: |
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221 for rev in revs: |
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222 yield rev |
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223 seen.update(revs) |
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224 |
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225 parentrevs = self._parentrevs |
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226 stoprev = self._stoprev |
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227 visit = util.deque(revs) |
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228 |
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229 while visit: |
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230 for parent in parentrevs(visit.popleft()): |
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231 if parent >= stoprev and parent not in seen: |
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232 visit.append(parent) |
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233 seen.add(parent) |
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234 yield parent |
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235 |
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236 def __contains__(self, target): |
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237 """Test whether target is an ancestor of self._initrevs.""" |
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238 # Trying to do both __iter__ and __contains__ using the same visit |
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239 # heap and seen set is complex enough that it slows down both. Keep |
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240 # them separate. |
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241 seen = self._containsseen |
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242 if target in seen: |
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243 return True |
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244 |
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245 parentrevs = self._parentrevs |
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246 visit = self._containsvisit |
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247 stoprev = self._stoprev |
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248 heappop = heapq.heappop |
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249 heappush = heapq.heappush |
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250 |
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251 targetseen = False |
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252 |
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253 while visit and -visit[0] > target and not targetseen: |
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254 for parent in parentrevs(-heappop(visit)): |
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255 if parent < stoprev or parent in seen: |
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256 continue |
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257 # We need to make sure we push all parents into the heap so |
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258 # that we leave it in a consistent state for future calls. |
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259 heappush(visit, -parent) |
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260 seen.add(parent) |
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261 if parent == target: |
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262 targetseen = True |
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263 |
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264 return targetseen |