Mercurial > hg
annotate mercurial/dagop.py @ 33229:dd50a370c8cb
configitems: register the 'patch.eol' config
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 30 Jun 2017 03:43:35 +0200 |
parents | a53bfc2845f2 |
children | b2670290eab4 |
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dagop: split module hosting DAG-related algorithms from revset
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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 # possible maximum depth between null and wdir() |
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24 _maxlogdepth = 0x80000000 |
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25 |
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26 def _walkrevtree(pfunc, revs, startdepth, stopdepth, reverse): |
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27 """Walk DAG using 'pfunc' from the given 'revs' nodes |
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28 |
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29 'pfunc(rev)' should return the parent/child revisions of the given 'rev' |
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30 if 'reverse' is True/False respectively. |
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31 |
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32 Scan ends at the stopdepth (exlusive) if specified. Revisions found |
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33 earlier than the startdepth are omitted. |
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34 """ |
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35 if startdepth is None: |
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36 startdepth = 0 |
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37 if stopdepth is None: |
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38 stopdepth = _maxlogdepth |
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39 if stopdepth == 0: |
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40 return |
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41 if stopdepth < 0: |
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42 raise error.ProgrammingError('negative stopdepth') |
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43 if reverse: |
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44 heapsign = -1 # max heap |
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45 else: |
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46 heapsign = +1 # min heap |
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47 |
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48 # load input revs lazily to heap so earlier revisions can be yielded |
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49 # without fully computing the input revs |
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50 revs.sort(reverse) |
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51 irevs = iter(revs) |
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52 pendingheap = [] # [(heapsign * rev, depth), ...] (i.e. lower depth first) |
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53 |
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54 inputrev = next(irevs, None) |
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55 if inputrev is not None: |
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56 heapq.heappush(pendingheap, (heapsign * inputrev, 0)) |
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57 |
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58 lastrev = None |
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59 while pendingheap: |
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60 currev, curdepth = heapq.heappop(pendingheap) |
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61 currev = heapsign * currev |
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62 if currev == inputrev: |
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63 inputrev = next(irevs, None) |
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64 if inputrev is not None: |
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65 heapq.heappush(pendingheap, (heapsign * inputrev, 0)) |
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66 # rescan parents until curdepth >= startdepth because queued entries |
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67 # of the same revision are iterated from the lowest depth |
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68 foundnew = (currev != lastrev) |
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69 if foundnew and curdepth >= startdepth: |
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70 lastrev = currev |
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71 yield currev |
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72 pdepth = curdepth + 1 |
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73 if foundnew and pdepth < stopdepth: |
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74 for prev in pfunc(currev): |
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75 if prev != node.nullrev: |
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76 heapq.heappush(pendingheap, (heapsign * prev, pdepth)) |
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77 |
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78 def _genrevancestors(repo, revs, followfirst, startdepth, stopdepth): |
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79 if followfirst: |
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80 cut = 1 |
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81 else: |
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82 cut = None |
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83 cl = repo.changelog |
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84 def pfunc(rev): |
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85 try: |
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86 return cl.parentrevs(rev)[:cut] |
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87 except error.WdirUnsupported: |
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88 return (pctx.rev() for pctx in repo[rev].parents()[:cut]) |
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89 return _walkrevtree(pfunc, revs, startdepth, stopdepth, reverse=True) |
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90 |
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91 def revancestors(repo, revs, followfirst, startdepth=None, stopdepth=None): |
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92 """Like revlog.ancestors(), but supports additional options, includes |
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93 the given revs themselves, and returns a smartset |
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94 |
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95 Scan ends at the stopdepth (exlusive) if specified. Revisions found |
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96 earlier than the startdepth are omitted. |
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97 """ |
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98 gen = _genrevancestors(repo, revs, followfirst, startdepth, stopdepth) |
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99 return generatorset(gen, iterasc=False) |
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100 |
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101 def _genrevdescendants(repo, revs, followfirst): |
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102 if followfirst: |
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103 cut = 1 |
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104 else: |
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105 cut = None |
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106 |
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107 cl = repo.changelog |
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108 first = revs.min() |
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109 nullrev = node.nullrev |
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110 if first == nullrev: |
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111 # Are there nodes with a null first parent and a non-null |
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112 # second one? Maybe. Do we care? Probably not. |
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113 yield first |
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114 for i in cl: |
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115 yield i |
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116 else: |
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117 seen = set(revs) |
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118 for i in cl.revs(first): |
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119 if i in seen: |
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120 yield i |
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121 continue |
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122 for x in cl.parentrevs(i)[:cut]: |
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123 if x != nullrev and x in seen: |
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124 seen.add(i) |
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125 yield i |
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126 break |
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127 |
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128 def _builddescendantsmap(repo, startrev, followfirst): |
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129 """Build map of 'rev -> child revs', offset from startrev""" |
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130 cl = repo.changelog |
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131 nullrev = node.nullrev |
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132 descmap = [[] for _rev in xrange(startrev, len(cl))] |
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133 for currev in cl.revs(startrev + 1): |
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134 p1rev, p2rev = cl.parentrevs(currev) |
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135 if p1rev >= startrev: |
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136 descmap[p1rev - startrev].append(currev) |
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137 if not followfirst and p2rev != nullrev and p2rev >= startrev: |
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138 descmap[p2rev - startrev].append(currev) |
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139 return descmap |
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140 |
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141 def _genrevdescendantsofdepth(repo, revs, followfirst, startdepth, stopdepth): |
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142 startrev = revs.min() |
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143 descmap = _builddescendantsmap(repo, startrev, followfirst) |
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144 def pfunc(rev): |
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145 return descmap[rev - startrev] |
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146 return _walkrevtree(pfunc, revs, startdepth, stopdepth, reverse=False) |
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147 |
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148 def revdescendants(repo, revs, followfirst, startdepth=None, stopdepth=None): |
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149 """Like revlog.descendants() but supports additional options, includes |
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150 the given revs themselves, and returns a smartset |
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151 |
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152 Scan ends at the stopdepth (exlusive) if specified. Revisions found |
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153 earlier than the startdepth are omitted. |
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154 """ |
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155 if startdepth is None and stopdepth is None: |
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156 gen = _genrevdescendants(repo, revs, followfirst) |
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157 else: |
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158 gen = _genrevdescendantsofdepth(repo, revs, followfirst, |
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159 startdepth, stopdepth) |
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160 return generatorset(gen, iterasc=True) |
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161 |
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162 def _reachablerootspure(repo, minroot, roots, heads, includepath): |
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163 """return (heads(::<roots> and ::<heads>)) |
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164 |
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165 If includepath is True, return (<roots>::<heads>).""" |
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166 if not roots: |
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167 return [] |
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168 parentrevs = repo.changelog.parentrevs |
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169 roots = set(roots) |
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170 visit = list(heads) |
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171 reachable = set() |
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172 seen = {} |
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173 # prefetch all the things! (because python is slow) |
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174 reached = reachable.add |
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175 dovisit = visit.append |
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176 nextvisit = visit.pop |
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177 # open-code the post-order traversal due to the tiny size of |
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178 # sys.getrecursionlimit() |
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179 while visit: |
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180 rev = nextvisit() |
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181 if rev in roots: |
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182 reached(rev) |
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183 if not includepath: |
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184 continue |
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185 parents = parentrevs(rev) |
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186 seen[rev] = parents |
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187 for parent in parents: |
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188 if parent >= minroot and parent not in seen: |
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189 dovisit(parent) |
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190 if not reachable: |
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191 return baseset() |
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192 if not includepath: |
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193 return reachable |
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194 for rev in sorted(seen): |
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195 for parent in seen[rev]: |
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196 if parent in reachable: |
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197 reached(rev) |
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198 return reachable |
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199 |
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200 def reachableroots(repo, roots, heads, includepath=False): |
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201 """return (heads(::<roots> and ::<heads>)) |
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202 |
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203 If includepath is True, return (<roots>::<heads>).""" |
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204 if not roots: |
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205 return baseset() |
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206 minroot = roots.min() |
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207 roots = list(roots) |
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208 heads = list(heads) |
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209 try: |
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210 revs = repo.changelog.reachableroots(minroot, heads, roots, includepath) |
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211 except AttributeError: |
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212 revs = _reachablerootspure(repo, minroot, roots, heads, includepath) |
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213 revs = baseset(revs) |
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214 revs.sort() |
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215 return revs |
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216 |
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217 def _changesrange(fctx1, fctx2, linerange2, diffopts): |
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218 """Return `(diffinrange, linerange1)` where `diffinrange` is True |
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219 if diff from fctx2 to fctx1 has changes in linerange2 and |
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220 `linerange1` is the new line range for fctx1. |
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221 """ |
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222 blocks = mdiff.allblocks(fctx1.data(), fctx2.data(), diffopts) |
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223 filteredblocks, linerange1 = mdiff.blocksinrange(blocks, linerange2) |
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224 diffinrange = any(stype == '!' for _, stype in filteredblocks) |
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225 return diffinrange, linerange1 |
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226 |
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227 def blockancestors(fctx, fromline, toline, followfirst=False): |
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228 """Yield ancestors of `fctx` with respect to the block of lines within |
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229 `fromline`-`toline` range. |
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230 """ |
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231 diffopts = patch.diffopts(fctx._repo.ui) |
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232 introrev = fctx.introrev() |
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233 if fctx.rev() != introrev: |
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234 fctx = fctx.filectx(fctx.filenode(), changeid=introrev) |
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235 visit = {(fctx.linkrev(), fctx.filenode()): (fctx, (fromline, toline))} |
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236 while visit: |
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237 c, linerange2 = visit.pop(max(visit)) |
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238 pl = c.parents() |
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239 if followfirst: |
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240 pl = pl[:1] |
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241 if not pl: |
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242 # The block originates from the initial revision. |
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243 yield c, linerange2 |
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244 continue |
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245 inrange = False |
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246 for p in pl: |
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247 inrangep, linerange1 = _changesrange(p, c, linerange2, diffopts) |
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248 inrange = inrange or inrangep |
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249 if linerange1[0] == linerange1[1]: |
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250 # Parent's linerange is empty, meaning that the block got |
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251 # introduced in this revision; no need to go futher in this |
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252 # branch. |
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253 continue |
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254 # Set _descendantrev with 'c' (a known descendant) so that, when |
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255 # _adjustlinkrev is called for 'p', it receives this descendant |
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256 # (as srcrev) instead possibly topmost introrev. |
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257 p._descendantrev = c.rev() |
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258 visit[p.linkrev(), p.filenode()] = p, linerange1 |
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259 if inrange: |
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260 yield c, linerange2 |
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261 |
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262 def blockdescendants(fctx, fromline, toline): |
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263 """Yield descendants of `fctx` with respect to the block of lines within |
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264 `fromline`-`toline` range. |
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265 """ |
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266 # First possibly yield 'fctx' if it has changes in range with respect to |
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267 # its parents. |
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268 try: |
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269 c, linerange1 = next(blockancestors(fctx, fromline, toline)) |
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270 except StopIteration: |
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271 pass |
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272 else: |
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273 if c == fctx: |
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274 yield c, linerange1 |
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275 |
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276 diffopts = patch.diffopts(fctx._repo.ui) |
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277 fl = fctx.filelog() |
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278 seen = {fctx.filerev(): (fctx, (fromline, toline))} |
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279 for i in fl.descendants([fctx.filerev()]): |
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280 c = fctx.filectx(i) |
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281 inrange = False |
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282 for x in fl.parentrevs(i): |
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283 try: |
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284 p, linerange2 = seen[x] |
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285 except KeyError: |
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286 # nullrev or other branch |
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287 continue |
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288 inrangep, linerange1 = _changesrange(c, p, linerange2, diffopts) |
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289 inrange = inrange or inrangep |
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290 # If revision 'i' has been seen (it's a merge), we assume that its |
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291 # line range is the same independently of which parents was used |
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292 # to compute it. |
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293 assert i not in seen or seen[i][1] == linerange1, ( |
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294 'computed line range for %s is not consistent between ' |
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295 'ancestor branches' % c) |
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296 seen[i] = c, linerange1 |
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297 if inrange: |
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298 yield c, linerange1 |
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299 |
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300 def toposort(revs, parentsfunc, firstbranch=()): |
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301 """Yield revisions from heads to roots one (topo) branch at a time. |
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302 |
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303 This function aims to be used by a graph generator that wishes to minimize |
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304 the number of parallel branches and their interleaving. |
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305 |
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306 Example iteration order (numbers show the "true" order in a changelog): |
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307 |
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308 o 4 |
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309 | |
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310 o 1 |
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311 | |
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312 | o 3 |
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313 | | |
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314 | o 2 |
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315 |/ |
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316 o 0 |
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317 |
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318 Note that the ancestors of merges are understood by the current |
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319 algorithm to be on the same branch. This means no reordering will |
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320 occur behind a merge. |
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321 """ |
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322 |
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323 ### Quick summary of the algorithm |
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324 # |
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325 # This function is based around a "retention" principle. We keep revisions |
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326 # in memory until we are ready to emit a whole branch that immediately |
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327 # "merges" into an existing one. This reduces the number of parallel |
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328 # branches with interleaved revisions. |
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329 # |
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330 # During iteration revs are split into two groups: |
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331 # A) revision already emitted |
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332 # B) revision in "retention". They are stored as different subgroups. |
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333 # |
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334 # for each REV, we do the following logic: |
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335 # |
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336 # 1) if REV is a parent of (A), we will emit it. If there is a |
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337 # retention group ((B) above) that is blocked on REV being |
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338 # available, we emit all the revisions out of that retention |
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339 # group first. |
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340 # |
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341 # 2) else, we'll search for a subgroup in (B) awaiting for REV to be |
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342 # available, if such subgroup exist, we add REV to it and the subgroup is |
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343 # now awaiting for REV.parents() to be available. |
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344 # |
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345 # 3) finally if no such group existed in (B), we create a new subgroup. |
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346 # |
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347 # |
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348 # To bootstrap the algorithm, we emit the tipmost revision (which |
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349 # puts it in group (A) from above). |
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350 |
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351 revs.sort(reverse=True) |
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352 |
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353 # Set of parents of revision that have been emitted. They can be considered |
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354 # unblocked as the graph generator is already aware of them so there is no |
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355 # need to delay the revisions that reference them. |
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356 # |
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357 # If someone wants to prioritize a branch over the others, pre-filling this |
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358 # set will force all other branches to wait until this branch is ready to be |
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359 # emitted. |
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360 unblocked = set(firstbranch) |
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361 |
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362 # list of groups waiting to be displayed, each group is defined by: |
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363 # |
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364 # (revs: lists of revs waiting to be displayed, |
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365 # blocked: set of that cannot be displayed before those in 'revs') |
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366 # |
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367 # The second value ('blocked') correspond to parents of any revision in the |
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368 # group ('revs') that is not itself contained in the group. The main idea |
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369 # of this algorithm is to delay as much as possible the emission of any |
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370 # revision. This means waiting for the moment we are about to display |
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371 # these parents to display the revs in a group. |
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372 # |
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373 # This first implementation is smart until it encounters a merge: it will |
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374 # emit revs as soon as any parent is about to be emitted and can grow an |
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375 # arbitrary number of revs in 'blocked'. In practice this mean we properly |
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376 # retains new branches but gives up on any special ordering for ancestors |
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377 # of merges. The implementation can be improved to handle this better. |
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378 # |
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379 # The first subgroup is special. It corresponds to all the revision that |
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380 # were already emitted. The 'revs' lists is expected to be empty and the |
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381 # 'blocked' set contains the parents revisions of already emitted revision. |
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382 # |
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383 # You could pre-seed the <parents> set of groups[0] to a specific |
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384 # changesets to select what the first emitted branch should be. |
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385 groups = [([], unblocked)] |
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386 pendingheap = [] |
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387 pendingset = set() |
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388 |
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389 heapq.heapify(pendingheap) |
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390 heappop = heapq.heappop |
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391 heappush = heapq.heappush |
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392 for currentrev in revs: |
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393 # Heap works with smallest element, we want highest so we invert |
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394 if currentrev not in pendingset: |
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395 heappush(pendingheap, -currentrev) |
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396 pendingset.add(currentrev) |
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397 # iterates on pending rev until after the current rev have been |
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398 # processed. |
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399 rev = None |
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400 while rev != currentrev: |
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401 rev = -heappop(pendingheap) |
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402 pendingset.remove(rev) |
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403 |
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404 # Seek for a subgroup blocked, waiting for the current revision. |
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405 matching = [i for i, g in enumerate(groups) if rev in g[1]] |
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406 |
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407 if matching: |
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408 # The main idea is to gather together all sets that are blocked |
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409 # on the same revision. |
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410 # |
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411 # Groups are merged when a common blocking ancestor is |
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412 # observed. For example, given two groups: |
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413 # |
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414 # revs [5, 4] waiting for 1 |
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415 # revs [3, 2] waiting for 1 |
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416 # |
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417 # These two groups will be merged when we process |
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418 # 1. In theory, we could have merged the groups when |
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419 # we added 2 to the group it is now in (we could have |
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420 # noticed the groups were both blocked on 1 then), but |
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421 # the way it works now makes the algorithm simpler. |
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422 # |
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423 # We also always keep the oldest subgroup first. We can |
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424 # probably improve the behavior by having the longest set |
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425 # first. That way, graph algorithms could minimise the length |
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426 # of parallel lines their drawing. This is currently not done. |
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427 targetidx = matching.pop(0) |
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428 trevs, tparents = groups[targetidx] |
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429 for i in matching: |
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430 gr = groups[i] |
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431 trevs.extend(gr[0]) |
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432 tparents |= gr[1] |
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433 # delete all merged subgroups (except the one we kept) |
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434 # (starting from the last subgroup for performance and |
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435 # sanity reasons) |
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436 for i in reversed(matching): |
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437 del groups[i] |
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438 else: |
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439 # This is a new head. We create a new subgroup for it. |
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440 targetidx = len(groups) |
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441 groups.append(([], {rev})) |
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442 |
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443 gr = groups[targetidx] |
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444 |
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445 # We now add the current nodes to this subgroups. This is done |
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446 # after the subgroup merging because all elements from a subgroup |
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447 # that relied on this rev must precede it. |
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448 # |
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449 # we also update the <parents> set to include the parents of the |
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450 # new nodes. |
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451 if rev == currentrev: # only display stuff in rev |
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452 gr[0].append(rev) |
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453 gr[1].remove(rev) |
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454 parents = [p for p in parentsfunc(rev) if p > node.nullrev] |
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455 gr[1].update(parents) |
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456 for p in parents: |
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457 if p not in pendingset: |
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458 pendingset.add(p) |
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459 heappush(pendingheap, -p) |
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460 |
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461 # Look for a subgroup to display |
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462 # |
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463 # When unblocked is empty (if clause), we were not waiting for any |
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464 # revisions during the first iteration (if no priority was given) or |
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465 # if we emitted a whole disconnected set of the graph (reached a |
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466 # root). In that case we arbitrarily take the oldest known |
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467 # subgroup. The heuristic could probably be better. |
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468 # |
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469 # Otherwise (elif clause) if the subgroup is blocked on |
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470 # a revision we just emitted, we can safely emit it as |
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471 # well. |
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472 if not unblocked: |
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473 if len(groups) > 1: # display other subset |
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474 targetidx = 1 |
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475 gr = groups[1] |
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476 elif not gr[1] & unblocked: |
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477 gr = None |
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478 |
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479 if gr is not None: |
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480 # update the set of awaited revisions with the one from the |
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481 # subgroup |
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482 unblocked |= gr[1] |
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483 # output all revisions in the subgroup |
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484 for r in gr[0]: |
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485 yield r |
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486 # delete the subgroup that you just output |
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487 # unless it is groups[0] in which case you just empty it. |
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488 if targetidx: |
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489 del groups[targetidx] |
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490 else: |
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491 gr[0][:] = [] |
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492 # Check if we have some subgroup waiting for revisions we are not going to |
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493 # iterate over |
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494 for g in groups: |
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495 for r in g[0]: |
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496 yield r |