Mercurial > hg
annotate mercurial/dagop.py @ 43593:ae91e4e4c9b0
tests: rename stopped and started variables to reflect times
In preparation for introducing more variables that will have
similar names.
Differential Revision: https://phab.mercurial-scm.org/D7125
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Wed, 16 Oct 2019 21:25:08 -0700 |
parents | 687b865b95ad |
children | 7cd5c0968139 |
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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 .node import nullrev |
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13 from .thirdparty import attr |
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14 from . import ( |
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15 error, |
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16 mdiff, |
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17 node, |
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18 patch, |
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19 pycompat, |
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20 smartset, |
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21 ) |
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23 baseset = smartset.baseset |
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24 generatorset = smartset.generatorset |
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25 |
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26 # possible maximum depth between null and wdir() |
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27 maxlogdepth = 0x80000000 |
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28 |
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29 |
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30 def _walkrevtree(pfunc, revs, startdepth, stopdepth, reverse): |
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31 """Walk DAG using 'pfunc' from the given 'revs' nodes |
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32 |
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33 'pfunc(rev)' should return the parent/child revisions of the given 'rev' |
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34 if 'reverse' is True/False respectively. |
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35 |
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36 Scan ends at the stopdepth (exlusive) if specified. Revisions found |
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37 earlier than the startdepth are omitted. |
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38 """ |
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39 if startdepth is None: |
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40 startdepth = 0 |
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41 if stopdepth is None: |
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42 stopdepth = maxlogdepth |
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43 if stopdepth == 0: |
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44 return |
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45 if stopdepth < 0: |
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46 raise error.ProgrammingError(b'negative stopdepth') |
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47 if reverse: |
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48 heapsign = -1 # max heap |
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49 else: |
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50 heapsign = +1 # min heap |
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51 |
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52 # load input revs lazily to heap so earlier revisions can be yielded |
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53 # without fully computing the input revs |
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54 revs.sort(reverse) |
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55 irevs = iter(revs) |
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56 pendingheap = [] # [(heapsign * rev, depth), ...] (i.e. lower depth first) |
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57 |
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58 inputrev = next(irevs, None) |
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59 if inputrev is not None: |
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60 heapq.heappush(pendingheap, (heapsign * inputrev, 0)) |
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61 |
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62 lastrev = None |
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63 while pendingheap: |
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64 currev, curdepth = heapq.heappop(pendingheap) |
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65 currev = heapsign * currev |
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66 if currev == inputrev: |
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67 inputrev = next(irevs, None) |
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68 if inputrev is not None: |
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69 heapq.heappush(pendingheap, (heapsign * inputrev, 0)) |
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70 # rescan parents until curdepth >= startdepth because queued entries |
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71 # of the same revision are iterated from the lowest depth |
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72 foundnew = currev != lastrev |
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73 if foundnew and curdepth >= startdepth: |
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74 lastrev = currev |
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75 yield currev |
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76 pdepth = curdepth + 1 |
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77 if foundnew and pdepth < stopdepth: |
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78 for prev in pfunc(currev): |
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79 if prev != node.nullrev: |
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80 heapq.heappush(pendingheap, (heapsign * prev, pdepth)) |
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81 |
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82 |
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83 def filectxancestors(fctxs, followfirst=False): |
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84 """Like filectx.ancestors(), but can walk from multiple files/revisions, |
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85 and includes the given fctxs themselves |
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86 |
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87 Yields (rev, {fctx, ...}) pairs in descending order. |
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88 """ |
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89 visit = {} |
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90 visitheap = [] |
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91 |
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92 def addvisit(fctx): |
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93 rev = fctx.rev() |
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94 if rev not in visit: |
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95 visit[rev] = set() |
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96 heapq.heappush(visitheap, -rev) # max heap |
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97 visit[rev].add(fctx) |
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98 |
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99 if followfirst: |
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100 cut = 1 |
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101 else: |
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102 cut = None |
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103 |
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104 for c in fctxs: |
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105 addvisit(c) |
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106 while visit: |
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107 currev = -(heapq.heappop(visitheap)) |
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108 curfctxs = visit.pop(currev) |
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109 yield currev, curfctxs |
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110 for c in curfctxs: |
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111 for parent in c.parents()[:cut]: |
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112 addvisit(parent) |
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113 assert not visitheap |
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114 |
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115 |
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116 def filerevancestors(fctxs, followfirst=False): |
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117 """Like filectx.ancestors(), but can walk from multiple files/revisions, |
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118 and includes the given fctxs themselves |
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119 |
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120 Returns a smartset. |
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121 """ |
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122 gen = (rev for rev, _cs in filectxancestors(fctxs, followfirst)) |
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123 return generatorset(gen, iterasc=False) |
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124 |
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125 |
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126 def _genrevancestors(repo, revs, followfirst, startdepth, stopdepth, cutfunc): |
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127 if followfirst: |
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128 cut = 1 |
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129 else: |
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130 cut = None |
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131 cl = repo.changelog |
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132 |
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133 def plainpfunc(rev): |
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134 try: |
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135 return cl.parentrevs(rev)[:cut] |
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136 except error.WdirUnsupported: |
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137 return (pctx.rev() for pctx in repo[rev].parents()[:cut]) |
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138 |
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139 if cutfunc is None: |
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140 pfunc = plainpfunc |
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141 else: |
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142 pfunc = lambda rev: [r for r in plainpfunc(rev) if not cutfunc(r)] |
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143 revs = revs.filter(lambda rev: not cutfunc(rev)) |
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144 return _walkrevtree(pfunc, revs, startdepth, stopdepth, reverse=True) |
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145 |
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146 |
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147 def revancestors( |
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148 repo, revs, followfirst=False, startdepth=None, stopdepth=None, cutfunc=None |
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149 ): |
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150 r"""Like revlog.ancestors(), but supports additional options, includes |
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151 the given revs themselves, and returns a smartset |
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152 |
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153 Scan ends at the stopdepth (exlusive) if specified. Revisions found |
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154 earlier than the startdepth are omitted. |
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155 |
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156 If cutfunc is provided, it will be used to cut the traversal of the DAG. |
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157 When cutfunc(X) returns True, the DAG traversal stops - revision X and |
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158 X's ancestors in the traversal path will be skipped. This could be an |
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159 optimization sometimes. |
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160 |
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161 Note: if Y is an ancestor of X, cutfunc(X) returning True does not |
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162 necessarily mean Y will also be cut. Usually cutfunc(Y) also wants to |
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163 return True in this case. For example, |
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164 |
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165 D # revancestors(repo, D, cutfunc=lambda rev: rev == B) |
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166 |\ # will include "A", because the path D -> C -> A was not cut. |
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167 B C # If "B" gets cut, "A" might want to be cut too. |
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168 |/ |
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169 A |
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170 """ |
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171 gen = _genrevancestors( |
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172 repo, revs, followfirst, startdepth, stopdepth, cutfunc |
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173 ) |
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174 return generatorset(gen, iterasc=False) |
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175 |
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176 |
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177 def _genrevdescendants(repo, revs, followfirst): |
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178 if followfirst: |
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179 cut = 1 |
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180 else: |
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181 cut = None |
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182 |
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183 cl = repo.changelog |
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184 first = revs.min() |
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185 nullrev = node.nullrev |
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186 if first == nullrev: |
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187 # Are there nodes with a null first parent and a non-null |
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188 # second one? Maybe. Do we care? Probably not. |
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189 yield first |
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190 for i in cl: |
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191 yield i |
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192 else: |
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193 seen = set(revs) |
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194 for i in cl.revs(first): |
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195 if i in seen: |
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196 yield i |
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197 continue |
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198 for x in cl.parentrevs(i)[:cut]: |
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199 if x != nullrev and x in seen: |
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200 seen.add(i) |
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201 yield i |
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202 break |
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203 |
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204 |
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205 def _builddescendantsmap(repo, startrev, followfirst): |
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206 """Build map of 'rev -> child revs', offset from startrev""" |
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207 cl = repo.changelog |
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208 nullrev = node.nullrev |
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209 descmap = [[] for _rev in pycompat.xrange(startrev, len(cl))] |
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210 for currev in cl.revs(startrev + 1): |
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211 p1rev, p2rev = cl.parentrevs(currev) |
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212 if p1rev >= startrev: |
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213 descmap[p1rev - startrev].append(currev) |
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214 if not followfirst and p2rev != nullrev and p2rev >= startrev: |
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215 descmap[p2rev - startrev].append(currev) |
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216 return descmap |
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217 |
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218 |
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219 def _genrevdescendantsofdepth(repo, revs, followfirst, startdepth, stopdepth): |
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220 startrev = revs.min() |
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221 descmap = _builddescendantsmap(repo, startrev, followfirst) |
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222 |
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223 def pfunc(rev): |
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224 return descmap[rev - startrev] |
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225 |
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226 return _walkrevtree(pfunc, revs, startdepth, stopdepth, reverse=False) |
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227 |
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228 |
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229 def revdescendants(repo, revs, followfirst, startdepth=None, stopdepth=None): |
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230 """Like revlog.descendants() but supports additional options, includes |
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231 the given revs themselves, and returns a smartset |
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232 |
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233 Scan ends at the stopdepth (exlusive) if specified. Revisions found |
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234 earlier than the startdepth are omitted. |
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235 """ |
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236 if startdepth is None and (stopdepth is None or stopdepth >= maxlogdepth): |
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237 gen = _genrevdescendants(repo, revs, followfirst) |
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238 else: |
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239 gen = _genrevdescendantsofdepth( |
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240 repo, revs, followfirst, startdepth, stopdepth |
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241 ) |
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242 return generatorset(gen, iterasc=True) |
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243 |
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244 |
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245 def descendantrevs(revs, revsfn, parentrevsfn): |
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246 """Generate revision number descendants in revision order. |
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247 |
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248 Yields revision numbers starting with a child of some rev in |
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249 ``revs``. Results are ordered by revision number and are |
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250 therefore topological. Each revision is not considered a descendant |
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251 of itself. |
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252 |
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253 ``revsfn`` is a callable that with no argument iterates over all |
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254 revision numbers and with a ``start`` argument iterates over revision |
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255 numbers beginning with that value. |
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256 |
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257 ``parentrevsfn`` is a callable that receives a revision number and |
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258 returns an iterable of parent revision numbers, whose values may include |
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259 nullrev. |
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260 """ |
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261 first = min(revs) |
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262 |
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263 if first == nullrev: |
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264 for rev in revsfn(): |
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265 yield rev |
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266 return |
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267 |
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268 seen = set(revs) |
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269 for rev in revsfn(start=first + 1): |
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270 for prev in parentrevsfn(rev): |
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271 if prev != nullrev and prev in seen: |
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272 seen.add(rev) |
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273 yield rev |
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274 break |
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275 |
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276 |
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277 def _reachablerootspure(pfunc, minroot, roots, heads, includepath): |
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278 """See revlog.reachableroots""" |
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279 if not roots: |
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280 return [] |
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281 roots = set(roots) |
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282 visit = list(heads) |
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283 reachable = set() |
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284 seen = {} |
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285 # prefetch all the things! (because python is slow) |
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286 reached = reachable.add |
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287 dovisit = visit.append |
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288 nextvisit = visit.pop |
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289 # open-code the post-order traversal due to the tiny size of |
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290 # sys.getrecursionlimit() |
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291 while visit: |
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292 rev = nextvisit() |
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293 if rev in roots: |
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294 reached(rev) |
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295 if not includepath: |
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296 continue |
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297 parents = pfunc(rev) |
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298 seen[rev] = parents |
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299 for parent in parents: |
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300 if parent >= minroot and parent not in seen: |
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301 dovisit(parent) |
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302 if not reachable: |
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303 return baseset() |
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304 if not includepath: |
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305 return reachable |
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306 for rev in sorted(seen): |
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307 for parent in seen[rev]: |
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308 if parent in reachable: |
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309 reached(rev) |
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310 return reachable |
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311 |
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312 |
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313 def reachableroots(repo, roots, heads, includepath=False): |
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314 """See revlog.reachableroots""" |
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315 if not roots: |
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316 return baseset() |
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317 minroot = roots.min() |
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318 roots = list(roots) |
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319 heads = list(heads) |
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320 revs = repo.changelog.reachableroots(minroot, heads, roots, includepath) |
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321 revs = baseset(revs) |
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322 revs.sort() |
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323 return revs |
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324 |
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325 |
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326 def _changesrange(fctx1, fctx2, linerange2, diffopts): |
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327 """Return `(diffinrange, linerange1)` where `diffinrange` is True |
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328 if diff from fctx2 to fctx1 has changes in linerange2 and |
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329 `linerange1` is the new line range for fctx1. |
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330 """ |
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331 blocks = mdiff.allblocks(fctx1.data(), fctx2.data(), diffopts) |
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332 filteredblocks, linerange1 = mdiff.blocksinrange(blocks, linerange2) |
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333 diffinrange = any(stype == b'!' for _, stype in filteredblocks) |
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334 return diffinrange, linerange1 |
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335 |
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336 |
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337 def blockancestors(fctx, fromline, toline, followfirst=False): |
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338 """Yield ancestors of `fctx` with respect to the block of lines within |
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339 `fromline`-`toline` range. |
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340 """ |
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341 diffopts = patch.diffopts(fctx._repo.ui) |
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342 fctx = fctx.introfilectx() |
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343 visit = {(fctx.linkrev(), fctx.filenode()): (fctx, (fromline, toline))} |
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344 while visit: |
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345 c, linerange2 = visit.pop(max(visit)) |
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346 pl = c.parents() |
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347 if followfirst: |
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348 pl = pl[:1] |
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349 if not pl: |
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350 # The block originates from the initial revision. |
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351 yield c, linerange2 |
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352 continue |
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353 inrange = False |
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354 for p in pl: |
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355 inrangep, linerange1 = _changesrange(p, c, linerange2, diffopts) |
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356 inrange = inrange or inrangep |
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357 if linerange1[0] == linerange1[1]: |
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358 # Parent's linerange is empty, meaning that the block got |
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359 # introduced in this revision; no need to go futher in this |
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360 # branch. |
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361 continue |
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362 # Set _descendantrev with 'c' (a known descendant) so that, when |
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363 # _adjustlinkrev is called for 'p', it receives this descendant |
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364 # (as srcrev) instead possibly topmost introrev. |
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365 p._descendantrev = c.rev() |
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366 visit[p.linkrev(), p.filenode()] = p, linerange1 |
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367 if inrange: |
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368 yield c, linerange2 |
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369 |
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370 |
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371 def blockdescendants(fctx, fromline, toline): |
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372 """Yield descendants of `fctx` with respect to the block of lines within |
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373 `fromline`-`toline` range. |
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374 """ |
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375 # First possibly yield 'fctx' if it has changes in range with respect to |
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376 # its parents. |
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377 try: |
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378 c, linerange1 = next(blockancestors(fctx, fromline, toline)) |
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379 except StopIteration: |
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380 pass |
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381 else: |
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382 if c == fctx: |
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383 yield c, linerange1 |
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384 |
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385 diffopts = patch.diffopts(fctx._repo.ui) |
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386 fl = fctx.filelog() |
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387 seen = {fctx.filerev(): (fctx, (fromline, toline))} |
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388 for i in fl.descendants([fctx.filerev()]): |
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389 c = fctx.filectx(i) |
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390 inrange = False |
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391 for x in fl.parentrevs(i): |
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392 try: |
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393 p, linerange2 = seen[x] |
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394 except KeyError: |
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395 # nullrev or other branch |
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396 continue |
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397 inrangep, linerange1 = _changesrange(c, p, linerange2, diffopts) |
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398 inrange = inrange or inrangep |
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399 # If revision 'i' has been seen (it's a merge) and the line range |
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400 # previously computed differs from the one we just got, we take the |
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401 # surrounding interval. This is conservative but avoids loosing |
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402 # information. |
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403 if i in seen and seen[i][1] != linerange1: |
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404 lbs, ubs = zip(linerange1, seen[i][1]) |
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405 linerange1 = min(lbs), max(ubs) |
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406 seen[i] = c, linerange1 |
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407 if inrange: |
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408 yield c, linerange1 |
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409 |
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410 |
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411 @attr.s(slots=True, frozen=True) |
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412 class annotateline(object): |
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413 fctx = attr.ib() |
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414 lineno = attr.ib() |
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415 # Whether this annotation was the result of a skip-annotate. |
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416 skip = attr.ib(default=False) |
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417 text = attr.ib(default=None) |
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418 |
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419 |
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420 @attr.s(slots=True, frozen=True) |
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421 class _annotatedfile(object): |
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422 # list indexed by lineno - 1 |
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423 fctxs = attr.ib() |
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424 linenos = attr.ib() |
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425 skips = attr.ib() |
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426 # full file content |
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427 text = attr.ib() |
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428 |
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429 |
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430 def _countlines(text): |
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431 if text.endswith(b"\n"): |
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432 return text.count(b"\n") |
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433 return text.count(b"\n") + int(bool(text)) |
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434 |
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435 |
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436 def _decoratelines(text, fctx): |
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437 n = _countlines(text) |
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438 linenos = pycompat.rangelist(1, n + 1) |
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439 return _annotatedfile([fctx] * n, linenos, [False] * n, text) |
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440 |
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441 |
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442 def _annotatepair(parents, childfctx, child, skipchild, diffopts): |
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443 r''' |
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444 Given parent and child fctxes and annotate data for parents, for all lines |
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445 in either parent that match the child, annotate the child with the parent's |
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446 data. |
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447 |
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448 Additionally, if `skipchild` is True, replace all other lines with parent |
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449 annotate data as well such that child is never blamed for any lines. |
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450 |
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451 See test-annotate.py for unit tests. |
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452 ''' |
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453 pblocks = [ |
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454 (parent, mdiff.allblocks(parent.text, child.text, opts=diffopts)) |
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455 for parent in parents |
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456 ] |
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457 |
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458 if skipchild: |
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459 # Need to iterate over the blocks twice -- make it a list |
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460 pblocks = [(p, list(blocks)) for (p, blocks) in pblocks] |
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461 # Mercurial currently prefers p2 over p1 for annotate. |
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462 # TODO: change this? |
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463 for parent, blocks in pblocks: |
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464 for (a1, a2, b1, b2), t in blocks: |
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465 # Changed blocks ('!') or blocks made only of blank lines ('~') |
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466 # belong to the child. |
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467 if t == b'=': |
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468 child.fctxs[b1:b2] = parent.fctxs[a1:a2] |
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469 child.linenos[b1:b2] = parent.linenos[a1:a2] |
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470 child.skips[b1:b2] = parent.skips[a1:a2] |
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471 |
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472 if skipchild: |
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473 # Now try and match up anything that couldn't be matched, |
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474 # Reversing pblocks maintains bias towards p2, matching above |
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475 # behavior. |
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476 pblocks.reverse() |
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477 |
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478 # The heuristics are: |
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479 # * Work on blocks of changed lines (effectively diff hunks with -U0). |
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480 # This could potentially be smarter but works well enough. |
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481 # * For a non-matching section, do a best-effort fit. Match lines in |
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482 # diff hunks 1:1, dropping lines as necessary. |
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483 # * Repeat the last line as a last resort. |
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484 |
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485 # First, replace as much as possible without repeating the last line. |
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486 remaining = [(parent, []) for parent, _blocks in pblocks] |
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487 for idx, (parent, blocks) in enumerate(pblocks): |
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488 for (a1, a2, b1, b2), _t in blocks: |
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489 if a2 - a1 >= b2 - b1: |
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490 for bk in pycompat.xrange(b1, b2): |
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491 if child.fctxs[bk] == childfctx: |
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492 ak = min(a1 + (bk - b1), a2 - 1) |
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493 child.fctxs[bk] = parent.fctxs[ak] |
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494 child.linenos[bk] = parent.linenos[ak] |
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495 child.skips[bk] = True |
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496 else: |
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497 remaining[idx][1].append((a1, a2, b1, b2)) |
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498 |
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499 # Then, look at anything left, which might involve repeating the last |
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500 # line. |
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501 for parent, blocks in remaining: |
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502 for a1, a2, b1, b2 in blocks: |
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503 for bk in pycompat.xrange(b1, b2): |
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504 if child.fctxs[bk] == childfctx: |
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505 ak = min(a1 + (bk - b1), a2 - 1) |
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506 child.fctxs[bk] = parent.fctxs[ak] |
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507 child.linenos[bk] = parent.linenos[ak] |
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508 child.skips[bk] = True |
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509 return child |
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510 |
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511 |
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512 def annotate(base, parents, skiprevs=None, diffopts=None): |
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513 """Core algorithm for filectx.annotate() |
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514 |
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515 `parents(fctx)` is a function returning a list of parent filectxs. |
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516 """ |
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517 |
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518 # This algorithm would prefer to be recursive, but Python is a |
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519 # bit recursion-hostile. Instead we do an iterative |
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520 # depth-first search. |
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521 |
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522 # 1st DFS pre-calculates pcache and needed |
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523 visit = [base] |
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524 pcache = {} |
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525 needed = {base: 1} |
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526 while visit: |
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527 f = visit.pop() |
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528 if f in pcache: |
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529 continue |
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530 pl = parents(f) |
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531 pcache[f] = pl |
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532 for p in pl: |
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533 needed[p] = needed.get(p, 0) + 1 |
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534 if p not in pcache: |
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535 visit.append(p) |
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536 |
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537 # 2nd DFS does the actual annotate |
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538 visit[:] = [base] |
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539 hist = {} |
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540 while visit: |
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541 f = visit[-1] |
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542 if f in hist: |
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543 visit.pop() |
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544 continue |
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545 |
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546 ready = True |
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547 pl = pcache[f] |
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548 for p in pl: |
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549 if p not in hist: |
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550 ready = False |
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551 visit.append(p) |
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552 if ready: |
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553 visit.pop() |
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554 curr = _decoratelines(f.data(), f) |
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555 skipchild = False |
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556 if skiprevs is not None: |
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557 skipchild = f._changeid in skiprevs |
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558 curr = _annotatepair( |
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559 [hist[p] for p in pl], f, curr, skipchild, diffopts |
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560 ) |
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561 for p in pl: |
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562 if needed[p] == 1: |
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563 del hist[p] |
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564 del needed[p] |
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565 else: |
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566 needed[p] -= 1 |
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567 |
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568 hist[f] = curr |
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569 del pcache[f] |
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570 |
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571 a = hist[base] |
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572 return [ |
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573 annotateline(*r) |
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574 for r in zip(a.fctxs, a.linenos, a.skips, mdiff.splitnewlines(a.text)) |
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575 ] |
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576 |
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577 |
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578 def toposort(revs, parentsfunc, firstbranch=()): |
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579 """Yield revisions from heads to roots one (topo) branch at a time. |
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580 |
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581 This function aims to be used by a graph generator that wishes to minimize |
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582 the number of parallel branches and their interleaving. |
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583 |
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584 Example iteration order (numbers show the "true" order in a changelog): |
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585 |
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586 o 4 |
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587 | |
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588 o 1 |
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589 | |
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590 | o 3 |
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591 | | |
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592 | o 2 |
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593 |/ |
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594 o 0 |
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595 |
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596 Note that the ancestors of merges are understood by the current |
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597 algorithm to be on the same branch. This means no reordering will |
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598 occur behind a merge. |
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599 """ |
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600 |
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601 ### Quick summary of the algorithm |
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602 # |
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603 # This function is based around a "retention" principle. We keep revisions |
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604 # in memory until we are ready to emit a whole branch that immediately |
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605 # "merges" into an existing one. This reduces the number of parallel |
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606 # branches with interleaved revisions. |
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607 # |
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608 # During iteration revs are split into two groups: |
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609 # A) revision already emitted |
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610 # B) revision in "retention". They are stored as different subgroups. |
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611 # |
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612 # for each REV, we do the following logic: |
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613 # |
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614 # 1) if REV is a parent of (A), we will emit it. If there is a |
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615 # retention group ((B) above) that is blocked on REV being |
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616 # available, we emit all the revisions out of that retention |
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617 # group first. |
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618 # |
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619 # 2) else, we'll search for a subgroup in (B) awaiting for REV to be |
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620 # available, if such subgroup exist, we add REV to it and the subgroup is |
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621 # now awaiting for REV.parents() to be available. |
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622 # |
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623 # 3) finally if no such group existed in (B), we create a new subgroup. |
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624 # |
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625 # |
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626 # To bootstrap the algorithm, we emit the tipmost revision (which |
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627 # puts it in group (A) from above). |
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628 |
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629 revs.sort(reverse=True) |
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630 |
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631 # Set of parents of revision that have been emitted. They can be considered |
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632 # unblocked as the graph generator is already aware of them so there is no |
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633 # need to delay the revisions that reference them. |
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634 # |
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635 # If someone wants to prioritize a branch over the others, pre-filling this |
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636 # set will force all other branches to wait until this branch is ready to be |
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637 # emitted. |
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638 unblocked = set(firstbranch) |
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639 |
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640 # list of groups waiting to be displayed, each group is defined by: |
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641 # |
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642 # (revs: lists of revs waiting to be displayed, |
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643 # blocked: set of that cannot be displayed before those in 'revs') |
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644 # |
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645 # The second value ('blocked') correspond to parents of any revision in the |
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646 # group ('revs') that is not itself contained in the group. The main idea |
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647 # of this algorithm is to delay as much as possible the emission of any |
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648 # revision. This means waiting for the moment we are about to display |
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649 # these parents to display the revs in a group. |
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650 # |
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651 # This first implementation is smart until it encounters a merge: it will |
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652 # emit revs as soon as any parent is about to be emitted and can grow an |
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653 # arbitrary number of revs in 'blocked'. In practice this mean we properly |
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654 # retains new branches but gives up on any special ordering for ancestors |
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655 # of merges. The implementation can be improved to handle this better. |
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656 # |
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657 # The first subgroup is special. It corresponds to all the revision that |
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658 # were already emitted. The 'revs' lists is expected to be empty and the |
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659 # 'blocked' set contains the parents revisions of already emitted revision. |
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660 # |
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661 # You could pre-seed the <parents> set of groups[0] to a specific |
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662 # changesets to select what the first emitted branch should be. |
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663 groups = [([], unblocked)] |
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664 pendingheap = [] |
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665 pendingset = set() |
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666 |
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667 heapq.heapify(pendingheap) |
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668 heappop = heapq.heappop |
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669 heappush = heapq.heappush |
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670 for currentrev in revs: |
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671 # Heap works with smallest element, we want highest so we invert |
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672 if currentrev not in pendingset: |
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673 heappush(pendingheap, -currentrev) |
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674 pendingset.add(currentrev) |
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675 # iterates on pending rev until after the current rev have been |
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676 # processed. |
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677 rev = None |
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678 while rev != currentrev: |
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679 rev = -heappop(pendingheap) |
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680 pendingset.remove(rev) |
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681 |
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682 # Seek for a subgroup blocked, waiting for the current revision. |
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683 matching = [i for i, g in enumerate(groups) if rev in g[1]] |
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684 |
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685 if matching: |
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686 # The main idea is to gather together all sets that are blocked |
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687 # on the same revision. |
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688 # |
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689 # Groups are merged when a common blocking ancestor is |
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690 # observed. For example, given two groups: |
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691 # |
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692 # revs [5, 4] waiting for 1 |
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693 # revs [3, 2] waiting for 1 |
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694 # |
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695 # These two groups will be merged when we process |
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696 # 1. In theory, we could have merged the groups when |
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697 # we added 2 to the group it is now in (we could have |
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698 # noticed the groups were both blocked on 1 then), but |
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699 # the way it works now makes the algorithm simpler. |
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700 # |
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701 # We also always keep the oldest subgroup first. We can |
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702 # probably improve the behavior by having the longest set |
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703 # first. That way, graph algorithms could minimise the length |
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704 # of parallel lines their drawing. This is currently not done. |
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|
705 targetidx = matching.pop(0) |
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|
706 trevs, tparents = groups[targetidx] |
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707 for i in matching: |
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|
708 gr = groups[i] |
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709 trevs.extend(gr[0]) |
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710 tparents |= gr[1] |
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711 # delete all merged subgroups (except the one we kept) |
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|
712 # (starting from the last subgroup for performance and |
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713 # sanity reasons) |
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|
714 for i in reversed(matching): |
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|
715 del groups[i] |
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|
716 else: |
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|
717 # This is a new head. We create a new subgroup for it. |
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718 targetidx = len(groups) |
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|
719 groups.append(([], {rev})) |
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720 |
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721 gr = groups[targetidx] |
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|
722 |
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723 # We now add the current nodes to this subgroups. This is done |
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724 # after the subgroup merging because all elements from a subgroup |
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725 # that relied on this rev must precede it. |
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|
726 # |
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727 # we also update the <parents> set to include the parents of the |
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728 # new nodes. |
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|
729 if rev == currentrev: # only display stuff in rev |
29347
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730 gr[0].append(rev) |
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|
731 gr[1].remove(rev) |
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732 parents = [p for p in parentsfunc(rev) if p > node.nullrev] |
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|
733 gr[1].update(parents) |
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|
734 for p in parents: |
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735 if p not in pendingset: |
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|
736 pendingset.add(p) |
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737 heappush(pendingheap, -p) |
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|
738 |
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739 # Look for a subgroup to display |
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|
740 # |
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741 # When unblocked is empty (if clause), we were not waiting for any |
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742 # revisions during the first iteration (if no priority was given) or |
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743 # if we emitted a whole disconnected set of the graph (reached a |
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744 # root). In that case we arbitrarily take the oldest known |
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745 # subgroup. The heuristic could probably be better. |
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|
746 # |
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|
747 # Otherwise (elif clause) if the subgroup is blocked on |
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|
748 # a revision we just emitted, we can safely emit it as |
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|
749 # well. |
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|
750 if not unblocked: |
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|
751 if len(groups) > 1: # display other subset |
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|
752 targetidx = 1 |
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|
753 gr = groups[1] |
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|
754 elif not gr[1] & unblocked: |
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|
755 gr = None |
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|
756 |
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|
757 if gr is not None: |
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|
758 # update the set of awaited revisions with the one from the |
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|
759 # subgroup |
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|
760 unblocked |= gr[1] |
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|
761 # output all revisions in the subgroup |
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|
762 for r in gr[0]: |
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|
763 yield r |
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|
764 # delete the subgroup that you just output |
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|
765 # unless it is groups[0] in which case you just empty it. |
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|
766 if targetidx: |
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|
767 del groups[targetidx] |
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|
768 else: |
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|
769 gr[0][:] = [] |
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|
770 # Check if we have some subgroup waiting for revisions we are not going to |
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|
771 # iterate over |
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|
772 for g in groups: |
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|
773 for r in g[0]: |
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|
774 yield r |
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parents:
38783
diff
changeset
|
775 |
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parents:
42446
diff
changeset
|
776 |
39179
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diff
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|
777 def headrevs(revs, parentsfn): |
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|
778 """Resolve the set of heads from a set of revisions. |
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|
779 |
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diff
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|
780 Receives an iterable of revision numbers and a callbable that receives a |
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diff
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|
781 revision number and returns an iterable of parent revision numbers, possibly |
1c3184d7e882
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diff
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|
782 including nullrev. |
1c3184d7e882
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diff
changeset
|
783 |
1c3184d7e882
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diff
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|
784 Returns a set of revision numbers that are DAG heads within the passed |
1c3184d7e882
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diff
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|
785 subset. |
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|
786 |
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diff
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|
787 ``nullrev`` is never included in the returned set, even if it is provided in |
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|
788 the input set. |
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|
789 """ |
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diff
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|
790 headrevs = set(revs) |
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parents:
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diff
changeset
|
791 parents = {node.nullrev} |
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parents:
40000
diff
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|
792 up = parents.update |
39179
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|
793 |
1c3184d7e882
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|
794 for rev in revs: |
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Boris Feld <boris.feld@octobus.net>
parents:
40000
diff
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|
795 up(parentsfn(rev)) |
61f9ef23a12f
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parents:
40000
diff
changeset
|
796 headrevs.difference_update(parents) |
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diff
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|
797 return headrevs |
39181
0a934ee94f09
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parents:
39179
diff
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|
798 |
43076
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Augie Fackler <augie@google.com>
parents:
42446
diff
changeset
|
799 |
40000
8af835af0a85
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
39999
diff
changeset
|
800 def headrevssubset(revsfn, parentrevsfn, startrev=None, stoprevs=None): |
8af835af0a85
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
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801 """Returns the set of all revs that have no children with control. |
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802 |
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803 ``revsfn`` is a callable that with no arguments returns an iterator over |
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804 all revision numbers in topological order. With a ``start`` argument, it |
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805 returns revision numbers starting at that number. |
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806 |
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807 ``parentrevsfn`` is a callable receiving a revision number and returns an |
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808 iterable of parent revision numbers, where values can include nullrev. |
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809 |
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810 ``startrev`` is a revision number at which to start the search. |
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811 |
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812 ``stoprevs`` is an iterable of revision numbers that, when encountered, |
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813 will stop DAG traversal beyond them. Parents of revisions in this |
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814 collection will be heads. |
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815 """ |
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816 if startrev is None: |
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817 startrev = nullrev |
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818 |
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819 stoprevs = set(stoprevs or []) |
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820 |
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821 reachable = {startrev} |
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822 heads = {startrev} |
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823 |
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824 for rev in revsfn(start=startrev + 1): |
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825 for prev in parentrevsfn(rev): |
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826 if prev in reachable: |
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827 if rev not in stoprevs: |
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828 reachable.add(rev) |
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829 heads.add(rev) |
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830 |
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831 if prev in heads and prev not in stoprevs: |
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832 heads.remove(prev) |
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833 |
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834 return heads |
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835 |
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836 |
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837 def linearize(revs, parentsfn): |
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838 """Linearize and topologically sort a list of revisions. |
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839 |
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840 The linearization process tries to create long runs of revs where a child |
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841 rev comes immediately after its first parent. This is done by visiting the |
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842 heads of the revs in inverse topological order, and for each visited rev, |
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843 visiting its second parent, then its first parent, then adding the rev |
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844 itself to the output list. |
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845 |
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846 Returns a list of revision numbers. |
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847 """ |
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848 visit = list(sorted(headrevs(revs, parentsfn), reverse=True)) |
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849 finished = set() |
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850 result = [] |
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851 |
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852 while visit: |
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853 rev = visit.pop() |
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854 if rev < 0: |
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855 rev = -rev - 1 |
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856 |
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857 if rev not in finished: |
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858 result.append(rev) |
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859 finished.add(rev) |
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860 |
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861 else: |
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862 visit.append(-rev - 1) |
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863 |
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864 for prev in parentsfn(rev): |
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865 if prev == node.nullrev or prev not in revs or prev in finished: |
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866 continue |
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867 |
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|
868 visit.append(prev) |
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869 |
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870 assert len(result) == len(revs) |
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871 |
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872 return result |