Mercurial > hg
annotate mercurial/dagop.py @ 33001:92d0945a15e0
dagop: compute depth in revancestors() generator
Surprisingly, this makes revset benchmark slightly faster. I don't know why,
but it appears that wrapping -inputrev by tuple is the key. So I decided to
just enable depth computation by default.
# reverse(ancestors(tip)) using hg repo
1) 0.081051
2) 0.075408
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sun, 18 Jun 2017 00:11:48 +0900 |
parents | d3d36bcdf036 |
children | 272a44cac57e |
rev | line source |
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1 # dagop.py - graph ancestry and topology algorithm for revset |
11275 | 2 # |
3 # Copyright 2010 Matt Mackall <mpm@selenic.com> | |
4 # | |
5 # This software may be used and distributed according to the terms of the | |
6 # GNU General Public License version 2 or any later version. | |
7 | |
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8 from __future__ import absolute_import |
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9 |
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10 import heapq |
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11 |
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12 from . import ( |
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13 error, |
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14 mdiff, |
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15 node, |
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16 patch, |
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17 smartset, |
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18 ) |
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20 baseset = smartset.baseset |
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21 generatorset = smartset.generatorset |
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22 |
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23 def _genrevancestors(repo, revs, followfirst): |
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24 if followfirst: |
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25 cut = 1 |
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26 else: |
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27 cut = None |
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28 cl = repo.changelog |
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29 |
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30 # load input revs lazily to heap so earlier revisions can be yielded |
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31 # without fully computing the input revs |
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32 revs.sort(reverse=True) |
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33 irevs = iter(revs) |
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34 pendingheap = [] # [(-rev, depth), ...] (i.e. lower depth first) |
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35 |
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36 inputrev = next(irevs, None) |
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37 if inputrev is not None: |
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38 heapq.heappush(pendingheap, (-inputrev, 0)) |
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39 |
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40 lastrev = None |
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41 while pendingheap: |
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42 currev, curdepth = heapq.heappop(pendingheap) |
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43 currev = -currev |
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44 if currev == inputrev: |
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45 inputrev = next(irevs, None) |
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46 if inputrev is not None: |
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47 heapq.heappush(pendingheap, (-inputrev, 0)) |
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48 if currev != lastrev: |
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49 lastrev = currev |
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50 yield currev |
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51 pdepth = curdepth + 1 |
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52 try: |
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53 for prev in cl.parentrevs(currev)[:cut]: |
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54 if prev != node.nullrev: |
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55 heapq.heappush(pendingheap, (-prev, pdepth)) |
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56 except error.WdirUnsupported: |
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57 for pctx in repo[currev].parents()[:cut]: |
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58 if pctx.rev() != node.nullrev: |
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59 heapq.heappush(pendingheap, (-pctx.rev(), pdepth)) |
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60 |
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61 def revancestors(repo, revs, followfirst): |
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62 """Like revlog.ancestors(), but supports followfirst.""" |
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63 gen = _genrevancestors(repo, revs, followfirst) |
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64 return generatorset(gen, iterasc=False) |
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65 |
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66 def revdescendants(repo, revs, followfirst): |
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67 """Like revlog.descendants() but supports followfirst.""" |
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68 if followfirst: |
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69 cut = 1 |
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70 else: |
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71 cut = None |
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72 |
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73 def iterate(): |
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74 cl = repo.changelog |
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75 # XXX this should be 'parentset.min()' assuming 'parentset' is a |
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76 # smartset (and if it is not, it should.) |
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77 first = min(revs) |
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78 nullrev = node.nullrev |
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79 if first == nullrev: |
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80 # Are there nodes with a null first parent and a non-null |
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81 # second one? Maybe. Do we care? Probably not. |
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82 for i in cl: |
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83 yield i |
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84 else: |
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85 seen = set(revs) |
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86 for i in cl.revs(first + 1): |
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87 for x in cl.parentrevs(i)[:cut]: |
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88 if x != nullrev and x in seen: |
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89 seen.add(i) |
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90 yield i |
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91 break |
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92 |
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93 return generatorset(iterate(), iterasc=True) |
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94 |
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95 def _reachablerootspure(repo, minroot, roots, heads, includepath): |
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96 """return (heads(::<roots> and ::<heads>)) |
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97 |
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98 If includepath is True, return (<roots>::<heads>).""" |
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99 if not roots: |
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100 return [] |
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101 parentrevs = repo.changelog.parentrevs |
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102 roots = set(roots) |
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103 visit = list(heads) |
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104 reachable = set() |
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105 seen = {} |
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106 # prefetch all the things! (because python is slow) |
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107 reached = reachable.add |
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108 dovisit = visit.append |
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109 nextvisit = visit.pop |
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110 # open-code the post-order traversal due to the tiny size of |
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111 # sys.getrecursionlimit() |
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112 while visit: |
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113 rev = nextvisit() |
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114 if rev in roots: |
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115 reached(rev) |
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116 if not includepath: |
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117 continue |
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118 parents = parentrevs(rev) |
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119 seen[rev] = parents |
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120 for parent in parents: |
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121 if parent >= minroot and parent not in seen: |
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122 dovisit(parent) |
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123 if not reachable: |
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124 return baseset() |
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125 if not includepath: |
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126 return reachable |
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127 for rev in sorted(seen): |
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128 for parent in seen[rev]: |
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129 if parent in reachable: |
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130 reached(rev) |
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131 return reachable |
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132 |
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133 def reachableroots(repo, roots, heads, includepath=False): |
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134 """return (heads(::<roots> and ::<heads>)) |
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135 |
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136 If includepath is True, return (<roots>::<heads>).""" |
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137 if not roots: |
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138 return baseset() |
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139 minroot = roots.min() |
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140 roots = list(roots) |
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141 heads = list(heads) |
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142 try: |
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143 revs = repo.changelog.reachableroots(minroot, heads, roots, includepath) |
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144 except AttributeError: |
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145 revs = _reachablerootspure(repo, minroot, roots, heads, includepath) |
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146 revs = baseset(revs) |
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147 revs.sort() |
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148 return revs |
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149 |
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150 def _changesrange(fctx1, fctx2, linerange2, diffopts): |
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151 """Return `(diffinrange, linerange1)` where `diffinrange` is True |
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152 if diff from fctx2 to fctx1 has changes in linerange2 and |
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153 `linerange1` is the new line range for fctx1. |
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154 """ |
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155 blocks = mdiff.allblocks(fctx1.data(), fctx2.data(), diffopts) |
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156 filteredblocks, linerange1 = mdiff.blocksinrange(blocks, linerange2) |
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157 diffinrange = any(stype == '!' for _, stype in filteredblocks) |
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158 return diffinrange, linerange1 |
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159 |
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160 def blockancestors(fctx, fromline, toline, followfirst=False): |
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161 """Yield ancestors of `fctx` with respect to the block of lines within |
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162 `fromline`-`toline` range. |
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163 """ |
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164 diffopts = patch.diffopts(fctx._repo.ui) |
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165 introrev = fctx.introrev() |
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166 if fctx.rev() != introrev: |
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167 fctx = fctx.filectx(fctx.filenode(), changeid=introrev) |
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168 visit = {(fctx.linkrev(), fctx.filenode()): (fctx, (fromline, toline))} |
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169 while visit: |
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170 c, linerange2 = visit.pop(max(visit)) |
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171 pl = c.parents() |
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172 if followfirst: |
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173 pl = pl[:1] |
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174 if not pl: |
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175 # The block originates from the initial revision. |
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176 yield c, linerange2 |
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177 continue |
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178 inrange = False |
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179 for p in pl: |
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180 inrangep, linerange1 = _changesrange(p, c, linerange2, diffopts) |
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181 inrange = inrange or inrangep |
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182 if linerange1[0] == linerange1[1]: |
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183 # Parent's linerange is empty, meaning that the block got |
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184 # introduced in this revision; no need to go futher in this |
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185 # branch. |
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186 continue |
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187 # Set _descendantrev with 'c' (a known descendant) so that, when |
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188 # _adjustlinkrev is called for 'p', it receives this descendant |
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189 # (as srcrev) instead possibly topmost introrev. |
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190 p._descendantrev = c.rev() |
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191 visit[p.linkrev(), p.filenode()] = p, linerange1 |
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192 if inrange: |
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193 yield c, linerange2 |
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194 |
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195 def blockdescendants(fctx, fromline, toline): |
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196 """Yield descendants of `fctx` with respect to the block of lines within |
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197 `fromline`-`toline` range. |
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198 """ |
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199 # First possibly yield 'fctx' if it has changes in range with respect to |
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200 # its parents. |
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201 try: |
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202 c, linerange1 = next(blockancestors(fctx, fromline, toline)) |
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203 except StopIteration: |
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204 pass |
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205 else: |
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206 if c == fctx: |
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207 yield c, linerange1 |
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208 |
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209 diffopts = patch.diffopts(fctx._repo.ui) |
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210 fl = fctx.filelog() |
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211 seen = {fctx.filerev(): (fctx, (fromline, toline))} |
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212 for i in fl.descendants([fctx.filerev()]): |
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213 c = fctx.filectx(i) |
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214 inrange = False |
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215 for x in fl.parentrevs(i): |
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216 try: |
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217 p, linerange2 = seen[x] |
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218 except KeyError: |
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219 # nullrev or other branch |
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220 continue |
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221 inrangep, linerange1 = _changesrange(c, p, linerange2, diffopts) |
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222 inrange = inrange or inrangep |
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223 # If revision 'i' has been seen (it's a merge), we assume that its |
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224 # line range is the same independently of which parents was used |
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225 # to compute it. |
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226 assert i not in seen or seen[i][1] == linerange1, ( |
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227 'computed line range for %s is not consistent between ' |
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228 'ancestor branches' % c) |
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229 seen[i] = c, linerange1 |
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230 if inrange: |
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231 yield c, linerange1 |
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232 |
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233 def toposort(revs, parentsfunc, firstbranch=()): |
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234 """Yield revisions from heads to roots one (topo) branch at a time. |
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235 |
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236 This function aims to be used by a graph generator that wishes to minimize |
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237 the number of parallel branches and their interleaving. |
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238 |
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239 Example iteration order (numbers show the "true" order in a changelog): |
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240 |
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241 o 4 |
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242 | |
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243 o 1 |
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244 | |
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245 | o 3 |
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246 | | |
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247 | o 2 |
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248 |/ |
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249 o 0 |
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250 |
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251 Note that the ancestors of merges are understood by the current |
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252 algorithm to be on the same branch. This means no reordering will |
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253 occur behind a merge. |
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254 """ |
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255 |
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256 ### Quick summary of the algorithm |
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257 # |
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258 # This function is based around a "retention" principle. We keep revisions |
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259 # in memory until we are ready to emit a whole branch that immediately |
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260 # "merges" into an existing one. This reduces the number of parallel |
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261 # branches with interleaved revisions. |
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262 # |
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263 # During iteration revs are split into two groups: |
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264 # A) revision already emitted |
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265 # B) revision in "retention". They are stored as different subgroups. |
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266 # |
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267 # for each REV, we do the following logic: |
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268 # |
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269 # 1) if REV is a parent of (A), we will emit it. If there is a |
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270 # retention group ((B) above) that is blocked on REV being |
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271 # available, we emit all the revisions out of that retention |
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272 # group first. |
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273 # |
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274 # 2) else, we'll search for a subgroup in (B) awaiting for REV to be |
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275 # available, if such subgroup exist, we add REV to it and the subgroup is |
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276 # now awaiting for REV.parents() to be available. |
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277 # |
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278 # 3) finally if no such group existed in (B), we create a new subgroup. |
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279 # |
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280 # |
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281 # To bootstrap the algorithm, we emit the tipmost revision (which |
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282 # puts it in group (A) from above). |
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283 |
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284 revs.sort(reverse=True) |
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285 |
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286 # Set of parents of revision that have been emitted. They can be considered |
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287 # unblocked as the graph generator is already aware of them so there is no |
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288 # need to delay the revisions that reference them. |
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289 # |
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290 # If someone wants to prioritize a branch over the others, pre-filling this |
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291 # set will force all other branches to wait until this branch is ready to be |
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292 # emitted. |
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293 unblocked = set(firstbranch) |
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294 |
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295 # list of groups waiting to be displayed, each group is defined by: |
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296 # |
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297 # (revs: lists of revs waiting to be displayed, |
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298 # blocked: set of that cannot be displayed before those in 'revs') |
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299 # |
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300 # The second value ('blocked') correspond to parents of any revision in the |
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301 # group ('revs') that is not itself contained in the group. The main idea |
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302 # of this algorithm is to delay as much as possible the emission of any |
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303 # revision. This means waiting for the moment we are about to display |
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304 # these parents to display the revs in a group. |
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305 # |
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306 # This first implementation is smart until it encounters a merge: it will |
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307 # emit revs as soon as any parent is about to be emitted and can grow an |
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308 # arbitrary number of revs in 'blocked'. In practice this mean we properly |
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309 # retains new branches but gives up on any special ordering for ancestors |
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310 # of merges. The implementation can be improved to handle this better. |
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311 # |
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312 # The first subgroup is special. It corresponds to all the revision that |
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313 # were already emitted. The 'revs' lists is expected to be empty and the |
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314 # 'blocked' set contains the parents revisions of already emitted revision. |
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315 # |
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316 # You could pre-seed the <parents> set of groups[0] to a specific |
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317 # changesets to select what the first emitted branch should be. |
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318 groups = [([], unblocked)] |
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319 pendingheap = [] |
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320 pendingset = set() |
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321 |
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322 heapq.heapify(pendingheap) |
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323 heappop = heapq.heappop |
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324 heappush = heapq.heappush |
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325 for currentrev in revs: |
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326 # Heap works with smallest element, we want highest so we invert |
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327 if currentrev not in pendingset: |
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328 heappush(pendingheap, -currentrev) |
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329 pendingset.add(currentrev) |
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330 # iterates on pending rev until after the current rev have been |
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331 # processed. |
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332 rev = None |
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333 while rev != currentrev: |
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334 rev = -heappop(pendingheap) |
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335 pendingset.remove(rev) |
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336 |
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337 # Seek for a subgroup blocked, waiting for the current revision. |
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338 matching = [i for i, g in enumerate(groups) if rev in g[1]] |
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339 |
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340 if matching: |
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341 # The main idea is to gather together all sets that are blocked |
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342 # on the same revision. |
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343 # |
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344 # Groups are merged when a common blocking ancestor is |
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345 # observed. For example, given two groups: |
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346 # |
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347 # revs [5, 4] waiting for 1 |
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348 # revs [3, 2] waiting for 1 |
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349 # |
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350 # These two groups will be merged when we process |
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351 # 1. In theory, we could have merged the groups when |
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352 # we added 2 to the group it is now in (we could have |
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353 # noticed the groups were both blocked on 1 then), but |
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354 # the way it works now makes the algorithm simpler. |
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355 # |
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356 # We also always keep the oldest subgroup first. We can |
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357 # probably improve the behavior by having the longest set |
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358 # first. That way, graph algorithms could minimise the length |
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359 # of parallel lines their drawing. This is currently not done. |
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360 targetidx = matching.pop(0) |
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361 trevs, tparents = groups[targetidx] |
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362 for i in matching: |
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363 gr = groups[i] |
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364 trevs.extend(gr[0]) |
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365 tparents |= gr[1] |
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366 # delete all merged subgroups (except the one we kept) |
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367 # (starting from the last subgroup for performance and |
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368 # sanity reasons) |
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369 for i in reversed(matching): |
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370 del groups[i] |
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371 else: |
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372 # This is a new head. We create a new subgroup for it. |
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373 targetidx = len(groups) |
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374 groups.append(([], {rev})) |
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375 |
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376 gr = groups[targetidx] |
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377 |
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378 # We now add the current nodes to this subgroups. This is done |
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379 # after the subgroup merging because all elements from a subgroup |
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380 # that relied on this rev must precede it. |
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381 # |
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382 # we also update the <parents> set to include the parents of the |
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383 # new nodes. |
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384 if rev == currentrev: # only display stuff in rev |
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385 gr[0].append(rev) |
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386 gr[1].remove(rev) |
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387 parents = [p for p in parentsfunc(rev) if p > node.nullrev] |
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388 gr[1].update(parents) |
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389 for p in parents: |
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390 if p not in pendingset: |
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391 pendingset.add(p) |
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392 heappush(pendingheap, -p) |
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393 |
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394 # Look for a subgroup to display |
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395 # |
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396 # When unblocked is empty (if clause), we were not waiting for any |
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397 # revisions during the first iteration (if no priority was given) or |
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398 # if we emitted a whole disconnected set of the graph (reached a |
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399 # root). In that case we arbitrarily take the oldest known |
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400 # subgroup. The heuristic could probably be better. |
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401 # |
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402 # Otherwise (elif clause) if the subgroup is blocked on |
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403 # a revision we just emitted, we can safely emit it as |
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404 # well. |
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405 if not unblocked: |
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406 if len(groups) > 1: # display other subset |
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407 targetidx = 1 |
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408 gr = groups[1] |
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409 elif not gr[1] & unblocked: |
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410 gr = None |
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411 |
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412 if gr is not None: |
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413 # update the set of awaited revisions with the one from the |
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414 # subgroup |
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415 unblocked |= gr[1] |
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416 # output all revisions in the subgroup |
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417 for r in gr[0]: |
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418 yield r |
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419 # delete the subgroup that you just output |
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420 # unless it is groups[0] in which case you just empty it. |
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421 if targetidx: |
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422 del groups[targetidx] |
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423 else: |
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424 gr[0][:] = [] |
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425 # Check if we have some subgroup waiting for revisions we are not going to |
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426 # iterate over |
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427 for g in groups: |
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428 for r in g[0]: |
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429 yield r |