Mercurial > hg
annotate mercurial/dagutil.py @ 19093:6f27efc7db23 stable
hgweb: fix empty navigation detection
For some obscure reason, changelog.node(0) returns nullid if changelog is empty.
this break empty navigation detection. We fix this code by using the length of
the changelog.
Using the length have some issue with revision filtering but this is a small
step in the right direction. Proper fix comes in later changeset.
author | Pierre-Yves David <pierre-yves.david@logilab.fr> |
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date | Tue, 30 Apr 2013 15:11:12 +0200 |
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children | 37e2bd560805 |
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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 and r != nullrev] |
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145 return map(self._internalize, ids) |
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146 |
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147 |
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148 class revlogdag(revlogbaseddag): |
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149 '''dag interface to a revlog''' |
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150 |
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151 def __init__(self, revlog): |
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152 revlogbaseddag.__init__(self, revlog, set(xrange(len(revlog)))) |
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153 |
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154 def _getheads(self): |
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155 return [r for r in self._revlog.headrevs() if r != nullrev] |
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156 |
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157 def parents(self, ix): |
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158 rlog = self._revlog |
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159 idx = rlog.index |
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160 revdata = idx[ix] |
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161 prev = revdata[5] |
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162 if prev != nullrev: |
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163 prev2 = revdata[6] |
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164 if prev2 == nullrev: |
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165 return [prev] |
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166 return [prev, prev2] |
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167 prev2 = revdata[6] |
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168 if prev2 != nullrev: |
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169 return [prev2] |
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170 return [] |
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171 |
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172 def inverse(self): |
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173 if self._inverse is None: |
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174 self._inverse = inverserevlogdag(self) |
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175 return self._inverse |
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176 |
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177 def ancestorset(self, starts, stops=None): |
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178 rlog = self._revlog |
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179 idx = rlog.index |
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180 stops = stops and set(stops) or set() |
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181 seen = set() |
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182 pending = list(starts) |
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183 while pending: |
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184 rev = pending.pop() |
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185 if rev not in seen and rev not in stops: |
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186 seen.add(rev) |
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187 revdata = idx[rev] |
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188 for i in [5, 6]: |
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189 prev = revdata[i] |
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190 if prev != nullrev: |
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191 pending.append(prev) |
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192 return seen |
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193 |
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194 def headsetofconnecteds(self, ixs): |
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195 if not ixs: |
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196 return set() |
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197 rlog = self._revlog |
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198 idx = rlog.index |
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199 headrevs = set(ixs) |
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200 for rev in ixs: |
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201 revdata = idx[rev] |
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202 for i in [5, 6]: |
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203 prev = revdata[i] |
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204 if prev != nullrev: |
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205 headrevs.discard(prev) |
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206 assert headrevs |
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207 return headrevs |
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208 |
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209 def linearize(self, ixs): |
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210 '''linearize and topologically sort a list of revisions |
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211 |
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212 The linearization process tries to create long runs of revs where |
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213 a child rev comes immediately after its first parent. This is done by |
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214 visiting the heads of the given revs in inverse topological order, |
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215 and for each visited rev, visiting its second parent, then its first |
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216 parent, then adding the rev itself to the output list. |
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217 ''' |
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218 sorted = [] |
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219 visit = list(self.headsetofconnecteds(ixs)) |
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220 visit.sort(reverse=True) |
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221 finished = set() |
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222 |
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223 while visit: |
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224 cur = visit.pop() |
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225 if cur < 0: |
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226 cur = -cur - 1 |
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227 if cur not in finished: |
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228 sorted.append(cur) |
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229 finished.add(cur) |
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230 else: |
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231 visit.append(-cur - 1) |
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232 visit += [p for p in self.parents(cur) |
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233 if p in ixs and p not in finished] |
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234 assert len(sorted) == len(ixs) |
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235 return sorted |
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236 |
14164
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237 |
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238 class inverserevlogdag(revlogbaseddag, genericdag): |
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239 '''inverse of an existing revlog dag; see revlogdag.inverse()''' |
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240 |
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241 def __init__(self, orig): |
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242 revlogbaseddag.__init__(self, orig._revlog, orig._nodeset) |
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243 self._orig = orig |
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244 self._children = {} |
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245 self._roots = [] |
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246 self._walkfrom = len(self._revlog) - 1 |
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247 |
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248 def _walkto(self, walkto): |
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249 rev = self._walkfrom |
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250 cs = self._children |
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251 roots = self._roots |
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252 idx = self._revlog.index |
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253 while rev >= walkto: |
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254 data = idx[rev] |
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255 isroot = True |
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256 for prev in [data[5], data[6]]: # parent revs |
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257 if prev != nullrev: |
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258 cs.setdefault(prev, []).append(rev) |
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259 isroot = False |
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260 if isroot: |
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261 roots.append(rev) |
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262 rev -= 1 |
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263 self._walkfrom = rev |
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264 |
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265 def _getheads(self): |
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266 self._walkto(nullrev) |
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267 return self._roots |
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268 |
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269 def parents(self, ix): |
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270 if ix is None: |
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271 return [] |
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272 if ix <= self._walkfrom: |
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273 self._walkto(ix) |
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274 return self._children.get(ix, []) |
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275 |
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276 def inverse(self): |
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277 return self._orig |