Mercurial > hg
annotate mercurial/dagutil.py @ 20555:4add43865a9b
ancestors: remove unnecessary handling of 'left'
If one of the initial nodes also is an ancestor then that most be the only
ancestor. There is no need for additional bookkeeping.
author | Mads Kiilerich <madski@unity3d.com> |
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date | Mon, 24 Feb 2014 22:42:13 +0100 |
parents | 34d4a037dced |
children | ce8cea923a6c |
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1 # dagutil.py - dag utilities for mercurial |
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2 # |
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3 # Copyright 2010 Benoit Boissinot <bboissin@gmail.com> |
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4 # and Peter Arrenbrecht <peter@arrenbrecht.ch> |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
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7 # GNU General Public License version 2 or any later version. |
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8 |
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9 from node import nullrev |
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10 from i18n import _ |
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11 |
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12 |
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13 class basedag(object): |
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14 '''generic interface for DAGs |
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15 |
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16 terms: |
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17 "ix" (short for index) identifies a nodes internally, |
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18 "id" identifies one externally. |
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19 |
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20 All params are ixs unless explicitly suffixed otherwise. |
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21 Pluralized params are lists or sets. |
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22 ''' |
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23 |
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24 def __init__(self): |
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25 self._inverse = None |
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26 |
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27 def nodeset(self): |
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28 '''set of all node idxs''' |
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29 raise NotImplementedError |
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30 |
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31 def heads(self): |
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32 '''list of head ixs''' |
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33 raise NotImplementedError |
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34 |
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35 def parents(self, ix): |
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36 '''list of parents ixs of ix''' |
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37 raise NotImplementedError |
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38 |
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39 def inverse(self): |
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40 '''inverse DAG, where parents becomes children, etc.''' |
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41 raise NotImplementedError |
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42 |
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43 def ancestorset(self, starts, stops=None): |
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44 ''' |
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45 set of all ancestors of starts (incl), but stop walk at stops (excl) |
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46 ''' |
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47 raise NotImplementedError |
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48 |
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49 def descendantset(self, starts, stops=None): |
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50 ''' |
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51 set of all descendants of starts (incl), but stop walk at stops (excl) |
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52 ''' |
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53 return self.inverse().ancestorset(starts, stops) |
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54 |
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55 def headsetofconnecteds(self, ixs): |
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56 ''' |
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57 subset of connected list of ixs so that no node has a descendant in it |
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58 |
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59 By "connected list" we mean that if an ancestor and a descendant are in |
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60 the list, then so is at least one path connecting them. |
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61 ''' |
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62 raise NotImplementedError |
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63 |
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64 def externalize(self, ix): |
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65 '''return a list of (or set if given a set) of node ids''' |
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66 return self._externalize(ix) |
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67 |
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68 def externalizeall(self, ixs): |
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69 '''return a list of (or set if given a set) of node ids''' |
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70 ids = self._externalizeall(ixs) |
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71 if isinstance(ixs, set): |
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72 return set(ids) |
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73 return list(ids) |
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74 |
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75 def internalize(self, id): |
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76 '''return a list of (or set if given a set) of node ixs''' |
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77 return self._internalize(id) |
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78 |
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79 def internalizeall(self, ids, filterunknown=False): |
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80 '''return a list of (or set if given a set) of node ids''' |
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81 ixs = self._internalizeall(ids, filterunknown) |
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82 if isinstance(ids, set): |
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83 return set(ixs) |
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84 return list(ixs) |
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85 |
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86 |
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87 class genericdag(basedag): |
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88 '''generic implementations for DAGs''' |
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89 |
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90 def ancestorset(self, starts, stops=None): |
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91 stops = stops and set(stops) or set() |
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92 seen = set() |
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93 pending = list(starts) |
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94 while pending: |
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95 n = pending.pop() |
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96 if n not in seen and n not in stops: |
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97 seen.add(n) |
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98 pending.extend(self.parents(n)) |
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99 return seen |
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100 |
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101 def headsetofconnecteds(self, ixs): |
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102 hds = set(ixs) |
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103 if not hds: |
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104 return hds |
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105 for n in ixs: |
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106 for p in self.parents(n): |
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107 hds.discard(p) |
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108 assert hds |
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109 return hds |
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110 |
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111 |
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112 class revlogbaseddag(basedag): |
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113 '''generic dag interface to a revlog''' |
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114 |
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115 def __init__(self, revlog, nodeset): |
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116 basedag.__init__(self) |
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117 self._revlog = revlog |
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118 self._heads = None |
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119 self._nodeset = nodeset |
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120 |
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121 def nodeset(self): |
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122 return self._nodeset |
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123 |
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124 def heads(self): |
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125 if self._heads is None: |
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126 self._heads = self._getheads() |
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127 return self._heads |
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128 |
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129 def _externalize(self, ix): |
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130 return self._revlog.index[ix][7] |
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131 def _externalizeall(self, ixs): |
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132 idx = self._revlog.index |
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133 return [idx[i][7] for i in ixs] |
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134 |
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135 def _internalize(self, id): |
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136 ix = self._revlog.rev(id) |
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137 if ix == nullrev: |
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138 raise LookupError(id, self._revlog.indexfile, _('nullid')) |
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139 return ix |
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140 def _internalizeall(self, ids, filterunknown): |
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141 rl = self._revlog |
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142 if filterunknown: |
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143 return [r for r in map(rl.nodemap.get, ids) |
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144 if (r is not None |
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145 and r != nullrev |
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146 and r not in rl.filteredrevs)] |
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147 return map(self._internalize, ids) |
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148 |
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149 |
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150 class revlogdag(revlogbaseddag): |
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151 '''dag interface to a revlog''' |
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152 |
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153 def __init__(self, revlog): |
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154 revlogbaseddag.__init__(self, revlog, set(revlog)) |
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155 |
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156 def _getheads(self): |
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157 return [r for r in self._revlog.headrevs() if r != nullrev] |
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158 |
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159 def parents(self, ix): |
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160 rlog = self._revlog |
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161 idx = rlog.index |
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162 revdata = idx[ix] |
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163 prev = revdata[5] |
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164 if prev != nullrev: |
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165 prev2 = revdata[6] |
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166 if prev2 == nullrev: |
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167 return [prev] |
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168 return [prev, prev2] |
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169 prev2 = revdata[6] |
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170 if prev2 != nullrev: |
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171 return [prev2] |
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172 return [] |
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173 |
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174 def inverse(self): |
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175 if self._inverse is None: |
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176 self._inverse = inverserevlogdag(self) |
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177 return self._inverse |
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178 |
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179 def ancestorset(self, starts, stops=None): |
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180 rlog = self._revlog |
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181 idx = rlog.index |
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182 stops = stops and set(stops) or set() |
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183 seen = set() |
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184 pending = list(starts) |
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185 while pending: |
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186 rev = pending.pop() |
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187 if rev not in seen and rev not in stops: |
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188 seen.add(rev) |
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189 revdata = idx[rev] |
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190 for i in [5, 6]: |
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191 prev = revdata[i] |
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192 if prev != nullrev: |
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193 pending.append(prev) |
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194 return seen |
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195 |
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196 def headsetofconnecteds(self, ixs): |
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197 if not ixs: |
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198 return set() |
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199 rlog = self._revlog |
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200 idx = rlog.index |
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201 headrevs = set(ixs) |
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202 for rev in ixs: |
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203 revdata = idx[rev] |
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204 for i in [5, 6]: |
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205 prev = revdata[i] |
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206 if prev != nullrev: |
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207 headrevs.discard(prev) |
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208 assert headrevs |
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209 return headrevs |
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210 |
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211 def linearize(self, ixs): |
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212 '''linearize and topologically sort a list of revisions |
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213 |
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214 The linearization process tries to create long runs of revs where |
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215 a child rev comes immediately after its first parent. This is done by |
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216 visiting the heads of the given revs in inverse topological order, |
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217 and for each visited rev, visiting its second parent, then its first |
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218 parent, then adding the rev itself to the output list. |
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219 ''' |
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220 sorted = [] |
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221 visit = list(self.headsetofconnecteds(ixs)) |
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222 visit.sort(reverse=True) |
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223 finished = set() |
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224 |
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225 while visit: |
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226 cur = visit.pop() |
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227 if cur < 0: |
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228 cur = -cur - 1 |
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229 if cur not in finished: |
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230 sorted.append(cur) |
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231 finished.add(cur) |
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232 else: |
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233 visit.append(-cur - 1) |
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234 visit += [p for p in self.parents(cur) |
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235 if p in ixs and p not in finished] |
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236 assert len(sorted) == len(ixs) |
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237 return sorted |
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238 |
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239 |
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240 class inverserevlogdag(revlogbaseddag, genericdag): |
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241 '''inverse of an existing revlog dag; see revlogdag.inverse()''' |
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242 |
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243 def __init__(self, orig): |
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244 revlogbaseddag.__init__(self, orig._revlog, orig._nodeset) |
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245 self._orig = orig |
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246 self._children = {} |
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247 self._roots = [] |
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248 self._walkfrom = len(self._revlog) - 1 |
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249 |
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250 def _walkto(self, walkto): |
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251 rev = self._walkfrom |
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252 cs = self._children |
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253 roots = self._roots |
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254 idx = self._revlog.index |
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255 while rev >= walkto: |
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256 data = idx[rev] |
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257 isroot = True |
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258 for prev in [data[5], data[6]]: # parent revs |
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259 if prev != nullrev: |
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260 cs.setdefault(prev, []).append(rev) |
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261 isroot = False |
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262 if isroot: |
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263 roots.append(rev) |
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264 rev -= 1 |
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265 self._walkfrom = rev |
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266 |
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267 def _getheads(self): |
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268 self._walkto(nullrev) |
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269 return self._roots |
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270 |
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271 def parents(self, ix): |
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272 if ix is None: |
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273 return [] |
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274 if ix <= self._walkfrom: |
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275 self._walkto(ix) |
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276 return self._children.get(ix, []) |
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277 |
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278 def inverse(self): |
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279 return self._orig |