Mercurial > hg
annotate mercurial/dagop.py @ 39620:b220851999b5
py3: use '%d' for integers instead of '%s'
Differential Revision: https://phab.mercurial-scm.org/D4593
author | Pulkit Goyal <pulkit@yandex-team.ru> |
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date | Sat, 15 Sep 2018 00:24:05 +0300 |
parents | 5362c96f2feb |
children | 0b24fcd88066 |
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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 .thirdparty import ( |
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13 attr, |
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14 ) |
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15 from . import ( |
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16 error, |
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17 mdiff, |
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18 node, |
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19 patch, |
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20 pycompat, |
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21 smartset, |
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22 ) |
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24 baseset = smartset.baseset |
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25 generatorset = smartset.generatorset |
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26 |
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27 # possible maximum depth between null and wdir() |
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28 _maxlogdepth = 0x80000000 |
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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('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 def filectxancestors(fctxs, followfirst=False): |
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83 """Like filectx.ancestors(), but can walk from multiple files/revisions, |
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84 and includes the given fctxs themselves |
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85 |
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86 Yields (rev, {fctx, ...}) pairs in descending order. |
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87 """ |
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88 visit = {} |
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89 visitheap = [] |
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90 def addvisit(fctx): |
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91 rev = fctx.rev() |
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92 if rev not in visit: |
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93 visit[rev] = set() |
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94 heapq.heappush(visitheap, -rev) # max heap |
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95 visit[rev].add(fctx) |
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96 |
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97 if followfirst: |
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98 cut = 1 |
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99 else: |
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100 cut = None |
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101 |
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102 for c in fctxs: |
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103 addvisit(c) |
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104 while visit: |
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105 currev = -heapq.heappop(visitheap) |
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106 curfctxs = visit.pop(currev) |
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107 yield currev, curfctxs |
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108 for c in curfctxs: |
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109 for parent in c.parents()[:cut]: |
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110 addvisit(parent) |
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111 assert not visitheap |
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112 |
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113 def filerevancestors(fctxs, followfirst=False): |
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114 """Like filectx.ancestors(), but can walk from multiple files/revisions, |
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115 and includes the given fctxs themselves |
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116 |
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117 Returns a smartset. |
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118 """ |
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119 gen = (rev for rev, _cs in filectxancestors(fctxs, followfirst)) |
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120 return generatorset(gen, iterasc=False) |
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121 |
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122 def _genrevancestors(repo, revs, followfirst, startdepth, stopdepth, cutfunc): |
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123 if followfirst: |
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124 cut = 1 |
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125 else: |
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126 cut = None |
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127 cl = repo.changelog |
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128 def plainpfunc(rev): |
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129 try: |
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130 return cl.parentrevs(rev)[:cut] |
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131 except error.WdirUnsupported: |
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132 return (pctx.rev() for pctx in repo[rev].parents()[:cut]) |
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133 if cutfunc is None: |
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134 pfunc = plainpfunc |
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135 else: |
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136 pfunc = lambda rev: [r for r in plainpfunc(rev) if not cutfunc(r)] |
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137 revs = revs.filter(lambda rev: not cutfunc(rev)) |
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138 return _walkrevtree(pfunc, revs, startdepth, stopdepth, reverse=True) |
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139 |
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140 def revancestors(repo, revs, followfirst=False, startdepth=None, |
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141 stopdepth=None, cutfunc=None): |
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142 """Like revlog.ancestors(), but supports additional options, includes |
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143 the given revs themselves, and returns a smartset |
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144 |
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145 Scan ends at the stopdepth (exlusive) if specified. Revisions found |
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146 earlier than the startdepth are omitted. |
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147 |
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148 If cutfunc is provided, it will be used to cut the traversal of the DAG. |
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149 When cutfunc(X) returns True, the DAG traversal stops - revision X and |
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150 X's ancestors in the traversal path will be skipped. This could be an |
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151 optimization sometimes. |
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152 |
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153 Note: if Y is an ancestor of X, cutfunc(X) returning True does not |
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154 necessarily mean Y will also be cut. Usually cutfunc(Y) also wants to |
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155 return True in this case. For example, |
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156 |
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157 D # revancestors(repo, D, cutfunc=lambda rev: rev == B) |
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158 |\ # will include "A", because the path D -> C -> A was not cut. |
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159 B C # If "B" gets cut, "A" might want to be cut too. |
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160 |/ |
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161 A |
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162 """ |
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163 gen = _genrevancestors(repo, revs, followfirst, startdepth, stopdepth, |
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164 cutfunc) |
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165 return generatorset(gen, iterasc=False) |
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166 |
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167 def _genrevdescendants(repo, revs, followfirst): |
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168 if followfirst: |
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169 cut = 1 |
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170 else: |
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171 cut = None |
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172 |
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173 cl = repo.changelog |
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174 first = revs.min() |
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175 nullrev = node.nullrev |
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176 if first == nullrev: |
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177 # Are there nodes with a null first parent and a non-null |
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178 # second one? Maybe. Do we care? Probably not. |
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179 yield first |
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180 for i in cl: |
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181 yield i |
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182 else: |
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183 seen = set(revs) |
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184 for i in cl.revs(first): |
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185 if i in seen: |
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186 yield i |
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187 continue |
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188 for x in cl.parentrevs(i)[:cut]: |
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189 if x != nullrev and x in seen: |
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190 seen.add(i) |
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191 yield i |
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192 break |
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193 |
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194 def _builddescendantsmap(repo, startrev, followfirst): |
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195 """Build map of 'rev -> child revs', offset from startrev""" |
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196 cl = repo.changelog |
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197 nullrev = node.nullrev |
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198 descmap = [[] for _rev in pycompat.xrange(startrev, len(cl))] |
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199 for currev in cl.revs(startrev + 1): |
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200 p1rev, p2rev = cl.parentrevs(currev) |
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201 if p1rev >= startrev: |
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202 descmap[p1rev - startrev].append(currev) |
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203 if not followfirst and p2rev != nullrev and p2rev >= startrev: |
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204 descmap[p2rev - startrev].append(currev) |
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205 return descmap |
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206 |
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207 def _genrevdescendantsofdepth(repo, revs, followfirst, startdepth, stopdepth): |
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208 startrev = revs.min() |
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209 descmap = _builddescendantsmap(repo, startrev, followfirst) |
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210 def pfunc(rev): |
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211 return descmap[rev - startrev] |
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212 return _walkrevtree(pfunc, revs, startdepth, stopdepth, reverse=False) |
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213 |
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214 def revdescendants(repo, revs, followfirst, startdepth=None, stopdepth=None): |
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215 """Like revlog.descendants() but supports additional options, includes |
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216 the given revs themselves, and returns a smartset |
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217 |
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218 Scan ends at the stopdepth (exlusive) if specified. Revisions found |
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219 earlier than the startdepth are omitted. |
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220 """ |
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221 if startdepth is None and stopdepth is None: |
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222 gen = _genrevdescendants(repo, revs, followfirst) |
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223 else: |
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224 gen = _genrevdescendantsofdepth(repo, revs, followfirst, |
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225 startdepth, stopdepth) |
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226 return generatorset(gen, iterasc=True) |
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227 |
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228 def _reachablerootspure(repo, minroot, roots, heads, includepath): |
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229 """return (heads(::<roots> and ::<heads>)) |
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230 |
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231 If includepath is True, return (<roots>::<heads>).""" |
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232 if not roots: |
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233 return [] |
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234 parentrevs = repo.changelog.parentrevs |
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235 roots = set(roots) |
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236 visit = list(heads) |
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237 reachable = set() |
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238 seen = {} |
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239 # prefetch all the things! (because python is slow) |
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240 reached = reachable.add |
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241 dovisit = visit.append |
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242 nextvisit = visit.pop |
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243 # open-code the post-order traversal due to the tiny size of |
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244 # sys.getrecursionlimit() |
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245 while visit: |
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246 rev = nextvisit() |
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247 if rev in roots: |
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248 reached(rev) |
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249 if not includepath: |
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250 continue |
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251 parents = parentrevs(rev) |
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252 seen[rev] = parents |
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253 for parent in parents: |
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254 if parent >= minroot and parent not in seen: |
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255 dovisit(parent) |
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256 if not reachable: |
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257 return baseset() |
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258 if not includepath: |
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259 return reachable |
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260 for rev in sorted(seen): |
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261 for parent in seen[rev]: |
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262 if parent in reachable: |
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263 reached(rev) |
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264 return reachable |
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265 |
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266 def reachableroots(repo, roots, heads, includepath=False): |
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267 """return (heads(::<roots> and ::<heads>)) |
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268 |
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269 If includepath is True, return (<roots>::<heads>).""" |
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270 if not roots: |
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271 return baseset() |
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272 minroot = roots.min() |
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273 roots = list(roots) |
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274 heads = list(heads) |
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275 try: |
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276 revs = repo.changelog.reachableroots(minroot, heads, roots, includepath) |
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277 except AttributeError: |
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278 revs = _reachablerootspure(repo, minroot, roots, heads, includepath) |
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279 revs = baseset(revs) |
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280 revs.sort() |
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281 return revs |
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282 |
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283 def _changesrange(fctx1, fctx2, linerange2, diffopts): |
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284 """Return `(diffinrange, linerange1)` where `diffinrange` is True |
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285 if diff from fctx2 to fctx1 has changes in linerange2 and |
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286 `linerange1` is the new line range for fctx1. |
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287 """ |
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288 blocks = mdiff.allblocks(fctx1.data(), fctx2.data(), diffopts) |
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289 filteredblocks, linerange1 = mdiff.blocksinrange(blocks, linerange2) |
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290 diffinrange = any(stype == '!' for _, stype in filteredblocks) |
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291 return diffinrange, linerange1 |
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292 |
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293 def blockancestors(fctx, fromline, toline, followfirst=False): |
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294 """Yield ancestors of `fctx` with respect to the block of lines within |
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295 `fromline`-`toline` range. |
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296 """ |
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297 diffopts = patch.diffopts(fctx._repo.ui) |
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298 fctx = fctx.introfilectx() |
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299 visit = {(fctx.linkrev(), fctx.filenode()): (fctx, (fromline, toline))} |
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300 while visit: |
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301 c, linerange2 = visit.pop(max(visit)) |
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302 pl = c.parents() |
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303 if followfirst: |
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304 pl = pl[:1] |
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305 if not pl: |
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306 # The block originates from the initial revision. |
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307 yield c, linerange2 |
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308 continue |
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309 inrange = False |
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310 for p in pl: |
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311 inrangep, linerange1 = _changesrange(p, c, linerange2, diffopts) |
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312 inrange = inrange or inrangep |
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313 if linerange1[0] == linerange1[1]: |
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314 # Parent's linerange is empty, meaning that the block got |
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315 # introduced in this revision; no need to go futher in this |
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316 # branch. |
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317 continue |
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318 # Set _descendantrev with 'c' (a known descendant) so that, when |
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319 # _adjustlinkrev is called for 'p', it receives this descendant |
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320 # (as srcrev) instead possibly topmost introrev. |
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321 p._descendantrev = c.rev() |
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322 visit[p.linkrev(), p.filenode()] = p, linerange1 |
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323 if inrange: |
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324 yield c, linerange2 |
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325 |
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326 def blockdescendants(fctx, fromline, toline): |
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327 """Yield descendants of `fctx` with respect to the block of lines within |
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328 `fromline`-`toline` range. |
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329 """ |
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330 # First possibly yield 'fctx' if it has changes in range with respect to |
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331 # its parents. |
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332 try: |
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333 c, linerange1 = next(blockancestors(fctx, fromline, toline)) |
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334 except StopIteration: |
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335 pass |
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336 else: |
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337 if c == fctx: |
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338 yield c, linerange1 |
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339 |
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340 diffopts = patch.diffopts(fctx._repo.ui) |
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341 fl = fctx.filelog() |
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342 seen = {fctx.filerev(): (fctx, (fromline, toline))} |
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343 for i in fl.descendants([fctx.filerev()]): |
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344 c = fctx.filectx(i) |
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345 inrange = False |
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346 for x in fl.parentrevs(i): |
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347 try: |
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348 p, linerange2 = seen[x] |
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349 except KeyError: |
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350 # nullrev or other branch |
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351 continue |
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352 inrangep, linerange1 = _changesrange(c, p, linerange2, diffopts) |
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353 inrange = inrange or inrangep |
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354 # If revision 'i' has been seen (it's a merge) and the line range |
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355 # previously computed differs from the one we just got, we take the |
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356 # surrounding interval. This is conservative but avoids loosing |
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357 # information. |
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358 if i in seen and seen[i][1] != linerange1: |
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359 lbs, ubs = zip(linerange1, seen[i][1]) |
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360 linerange1 = min(lbs), max(ubs) |
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361 seen[i] = c, linerange1 |
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362 if inrange: |
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363 yield c, linerange1 |
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364 |
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365 @attr.s(slots=True, frozen=True) |
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366 class annotateline(object): |
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367 fctx = attr.ib() |
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368 lineno = attr.ib() |
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369 # Whether this annotation was the result of a skip-annotate. |
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370 skip = attr.ib(default=False) |
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371 text = attr.ib(default=None) |
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372 |
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373 @attr.s(slots=True, frozen=True) |
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374 class _annotatedfile(object): |
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375 # list indexed by lineno - 1 |
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376 fctxs = attr.ib() |
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377 linenos = attr.ib() |
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378 skips = attr.ib() |
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379 # full file content |
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380 text = attr.ib() |
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381 |
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382 def _countlines(text): |
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383 if text.endswith("\n"): |
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384 return text.count("\n") |
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385 return text.count("\n") + int(bool(text)) |
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386 |
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387 def _decoratelines(text, fctx): |
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388 n = _countlines(text) |
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389 linenos = pycompat.rangelist(1, n + 1) |
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390 return _annotatedfile([fctx] * n, linenos, [False] * n, text) |
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391 |
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392 def _annotatepair(parents, childfctx, child, skipchild, diffopts): |
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393 r''' |
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394 Given parent and child fctxes and annotate data for parents, for all lines |
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395 in either parent that match the child, annotate the child with the parent's |
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396 data. |
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397 |
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398 Additionally, if `skipchild` is True, replace all other lines with parent |
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399 annotate data as well such that child is never blamed for any lines. |
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400 |
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401 See test-annotate.py for unit tests. |
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402 ''' |
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403 pblocks = [(parent, mdiff.allblocks(parent.text, child.text, opts=diffopts)) |
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404 for parent in parents] |
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405 |
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406 if skipchild: |
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407 # Need to iterate over the blocks twice -- make it a list |
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408 pblocks = [(p, list(blocks)) for (p, blocks) in pblocks] |
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409 # Mercurial currently prefers p2 over p1 for annotate. |
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410 # TODO: change this? |
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411 for parent, blocks in pblocks: |
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412 for (a1, a2, b1, b2), t in blocks: |
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413 # Changed blocks ('!') or blocks made only of blank lines ('~') |
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414 # belong to the child. |
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415 if t == '=': |
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416 child.fctxs[b1:b2] = parent.fctxs[a1:a2] |
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417 child.linenos[b1:b2] = parent.linenos[a1:a2] |
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418 child.skips[b1:b2] = parent.skips[a1:a2] |
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419 |
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420 if skipchild: |
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421 # Now try and match up anything that couldn't be matched, |
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422 # Reversing pblocks maintains bias towards p2, matching above |
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423 # behavior. |
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424 pblocks.reverse() |
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425 |
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426 # The heuristics are: |
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427 # * Work on blocks of changed lines (effectively diff hunks with -U0). |
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428 # This could potentially be smarter but works well enough. |
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429 # * For a non-matching section, do a best-effort fit. Match lines in |
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430 # diff hunks 1:1, dropping lines as necessary. |
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431 # * Repeat the last line as a last resort. |
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432 |
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433 # First, replace as much as possible without repeating the last line. |
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434 remaining = [(parent, []) for parent, _blocks in pblocks] |
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435 for idx, (parent, blocks) in enumerate(pblocks): |
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436 for (a1, a2, b1, b2), _t in blocks: |
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437 if a2 - a1 >= b2 - b1: |
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438 for bk in pycompat.xrange(b1, b2): |
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439 if child.fctxs[bk] == childfctx: |
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440 ak = min(a1 + (bk - b1), a2 - 1) |
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441 child.fctxs[bk] = parent.fctxs[ak] |
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442 child.linenos[bk] = parent.linenos[ak] |
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443 child.skips[bk] = True |
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444 else: |
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445 remaining[idx][1].append((a1, a2, b1, b2)) |
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446 |
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447 # Then, look at anything left, which might involve repeating the last |
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448 # line. |
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449 for parent, blocks in remaining: |
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450 for a1, a2, b1, b2 in blocks: |
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451 for bk in pycompat.xrange(b1, b2): |
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452 if child.fctxs[bk] == childfctx: |
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453 ak = min(a1 + (bk - b1), a2 - 1) |
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454 child.fctxs[bk] = parent.fctxs[ak] |
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455 child.linenos[bk] = parent.linenos[ak] |
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456 child.skips[bk] = True |
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457 return child |
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458 |
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459 def annotate(base, parents, skiprevs=None, diffopts=None): |
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460 """Core algorithm for filectx.annotate() |
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461 |
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462 `parents(fctx)` is a function returning a list of parent filectxs. |
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463 """ |
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464 |
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465 # This algorithm would prefer to be recursive, but Python is a |
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466 # bit recursion-hostile. Instead we do an iterative |
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467 # depth-first search. |
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468 |
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469 # 1st DFS pre-calculates pcache and needed |
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470 visit = [base] |
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471 pcache = {} |
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472 needed = {base: 1} |
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473 while visit: |
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474 f = visit.pop() |
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475 if f in pcache: |
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476 continue |
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477 pl = parents(f) |
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478 pcache[f] = pl |
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479 for p in pl: |
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480 needed[p] = needed.get(p, 0) + 1 |
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481 if p not in pcache: |
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482 visit.append(p) |
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483 |
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484 # 2nd DFS does the actual annotate |
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485 visit[:] = [base] |
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486 hist = {} |
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487 while visit: |
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488 f = visit[-1] |
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489 if f in hist: |
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490 visit.pop() |
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491 continue |
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492 |
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493 ready = True |
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494 pl = pcache[f] |
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495 for p in pl: |
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496 if p not in hist: |
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497 ready = False |
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498 visit.append(p) |
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499 if ready: |
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500 visit.pop() |
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501 curr = _decoratelines(f.data(), f) |
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502 skipchild = False |
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503 if skiprevs is not None: |
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504 skipchild = f._changeid in skiprevs |
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505 curr = _annotatepair([hist[p] for p in pl], f, curr, skipchild, |
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506 diffopts) |
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507 for p in pl: |
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508 if needed[p] == 1: |
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509 del hist[p] |
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510 del needed[p] |
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511 else: |
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512 needed[p] -= 1 |
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513 |
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514 hist[f] = curr |
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515 del pcache[f] |
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516 |
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517 a = hist[base] |
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518 return [annotateline(*r) for r in zip(a.fctxs, a.linenos, a.skips, |
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519 mdiff.splitnewlines(a.text))] |
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520 |
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521 def toposort(revs, parentsfunc, firstbranch=()): |
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522 """Yield revisions from heads to roots one (topo) branch at a time. |
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523 |
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524 This function aims to be used by a graph generator that wishes to minimize |
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525 the number of parallel branches and their interleaving. |
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526 |
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527 Example iteration order (numbers show the "true" order in a changelog): |
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528 |
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529 o 4 |
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530 | |
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531 o 1 |
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532 | |
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533 | o 3 |
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534 | | |
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535 | o 2 |
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536 |/ |
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537 o 0 |
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538 |
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539 Note that the ancestors of merges are understood by the current |
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540 algorithm to be on the same branch. This means no reordering will |
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541 occur behind a merge. |
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542 """ |
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543 |
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544 ### Quick summary of the algorithm |
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545 # |
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546 # This function is based around a "retention" principle. We keep revisions |
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547 # in memory until we are ready to emit a whole branch that immediately |
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548 # "merges" into an existing one. This reduces the number of parallel |
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549 # branches with interleaved revisions. |
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550 # |
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551 # During iteration revs are split into two groups: |
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552 # A) revision already emitted |
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553 # B) revision in "retention". They are stored as different subgroups. |
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554 # |
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555 # for each REV, we do the following logic: |
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556 # |
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557 # 1) if REV is a parent of (A), we will emit it. If there is a |
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558 # retention group ((B) above) that is blocked on REV being |
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559 # available, we emit all the revisions out of that retention |
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560 # group first. |
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561 # |
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562 # 2) else, we'll search for a subgroup in (B) awaiting for REV to be |
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563 # available, if such subgroup exist, we add REV to it and the subgroup is |
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564 # now awaiting for REV.parents() to be available. |
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565 # |
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566 # 3) finally if no such group existed in (B), we create a new subgroup. |
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567 # |
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568 # |
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569 # To bootstrap the algorithm, we emit the tipmost revision (which |
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570 # puts it in group (A) from above). |
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571 |
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572 revs.sort(reverse=True) |
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573 |
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574 # Set of parents of revision that have been emitted. They can be considered |
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575 # unblocked as the graph generator is already aware of them so there is no |
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576 # need to delay the revisions that reference them. |
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577 # |
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578 # If someone wants to prioritize a branch over the others, pre-filling this |
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579 # set will force all other branches to wait until this branch is ready to be |
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580 # emitted. |
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581 unblocked = set(firstbranch) |
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582 |
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583 # list of groups waiting to be displayed, each group is defined by: |
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584 # |
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585 # (revs: lists of revs waiting to be displayed, |
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586 # blocked: set of that cannot be displayed before those in 'revs') |
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587 # |
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588 # The second value ('blocked') correspond to parents of any revision in the |
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589 # group ('revs') that is not itself contained in the group. The main idea |
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590 # of this algorithm is to delay as much as possible the emission of any |
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591 # revision. This means waiting for the moment we are about to display |
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592 # these parents to display the revs in a group. |
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593 # |
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594 # This first implementation is smart until it encounters a merge: it will |
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595 # emit revs as soon as any parent is about to be emitted and can grow an |
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596 # arbitrary number of revs in 'blocked'. In practice this mean we properly |
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597 # retains new branches but gives up on any special ordering for ancestors |
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598 # of merges. The implementation can be improved to handle this better. |
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599 # |
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600 # The first subgroup is special. It corresponds to all the revision that |
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601 # were already emitted. The 'revs' lists is expected to be empty and the |
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602 # 'blocked' set contains the parents revisions of already emitted revision. |
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603 # |
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604 # You could pre-seed the <parents> set of groups[0] to a specific |
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605 # changesets to select what the first emitted branch should be. |
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606 groups = [([], unblocked)] |
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607 pendingheap = [] |
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608 pendingset = set() |
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609 |
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610 heapq.heapify(pendingheap) |
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611 heappop = heapq.heappop |
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612 heappush = heapq.heappush |
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613 for currentrev in revs: |
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614 # Heap works with smallest element, we want highest so we invert |
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615 if currentrev not in pendingset: |
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616 heappush(pendingheap, -currentrev) |
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617 pendingset.add(currentrev) |
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618 # iterates on pending rev until after the current rev have been |
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619 # processed. |
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620 rev = None |
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621 while rev != currentrev: |
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622 rev = -heappop(pendingheap) |
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623 pendingset.remove(rev) |
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624 |
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625 # Seek for a subgroup blocked, waiting for the current revision. |
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626 matching = [i for i, g in enumerate(groups) if rev in g[1]] |
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627 |
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628 if matching: |
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629 # The main idea is to gather together all sets that are blocked |
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630 # on the same revision. |
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631 # |
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632 # Groups are merged when a common blocking ancestor is |
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633 # observed. For example, given two groups: |
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634 # |
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635 # revs [5, 4] waiting for 1 |
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636 # revs [3, 2] waiting for 1 |
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637 # |
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638 # These two groups will be merged when we process |
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639 # 1. In theory, we could have merged the groups when |
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640 # we added 2 to the group it is now in (we could have |
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641 # noticed the groups were both blocked on 1 then), but |
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642 # the way it works now makes the algorithm simpler. |
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643 # |
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644 # We also always keep the oldest subgroup first. We can |
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645 # probably improve the behavior by having the longest set |
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646 # first. That way, graph algorithms could minimise the length |
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647 # of parallel lines their drawing. This is currently not done. |
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648 targetidx = matching.pop(0) |
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649 trevs, tparents = groups[targetidx] |
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650 for i in matching: |
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651 gr = groups[i] |
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652 trevs.extend(gr[0]) |
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653 tparents |= gr[1] |
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654 # delete all merged subgroups (except the one we kept) |
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655 # (starting from the last subgroup for performance and |
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656 # sanity reasons) |
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657 for i in reversed(matching): |
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658 del groups[i] |
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659 else: |
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660 # This is a new head. We create a new subgroup for it. |
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661 targetidx = len(groups) |
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662 groups.append(([], {rev})) |
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663 |
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664 gr = groups[targetidx] |
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665 |
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666 # We now add the current nodes to this subgroups. This is done |
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667 # after the subgroup merging because all elements from a subgroup |
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668 # that relied on this rev must precede it. |
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669 # |
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670 # we also update the <parents> set to include the parents of the |
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671 # new nodes. |
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672 if rev == currentrev: # only display stuff in rev |
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673 gr[0].append(rev) |
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674 gr[1].remove(rev) |
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675 parents = [p for p in parentsfunc(rev) if p > node.nullrev] |
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676 gr[1].update(parents) |
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677 for p in parents: |
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678 if p not in pendingset: |
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679 pendingset.add(p) |
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680 heappush(pendingheap, -p) |
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681 |
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682 # Look for a subgroup to display |
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683 # |
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684 # When unblocked is empty (if clause), we were not waiting for any |
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685 # revisions during the first iteration (if no priority was given) or |
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686 # if we emitted a whole disconnected set of the graph (reached a |
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687 # root). In that case we arbitrarily take the oldest known |
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688 # subgroup. The heuristic could probably be better. |
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689 # |
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690 # Otherwise (elif clause) if the subgroup is blocked on |
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691 # a revision we just emitted, we can safely emit it as |
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692 # well. |
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693 if not unblocked: |
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694 if len(groups) > 1: # display other subset |
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695 targetidx = 1 |
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696 gr = groups[1] |
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697 elif not gr[1] & unblocked: |
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698 gr = None |
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|
699 |
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|
700 if gr is not None: |
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|
701 # update the set of awaited revisions with the one from the |
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702 # subgroup |
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|
703 unblocked |= gr[1] |
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704 # output all revisions in the subgroup |
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|
705 for r in gr[0]: |
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|
706 yield r |
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|
707 # delete the subgroup that you just output |
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|
708 # unless it is groups[0] in which case you just empty it. |
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|
709 if targetidx: |
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|
710 del groups[targetidx] |
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|
711 else: |
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|
712 gr[0][:] = [] |
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|
713 # Check if we have some subgroup waiting for revisions we are not going to |
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714 # iterate over |
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|
715 for g in groups: |
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|
716 for r in g[0]: |
98535ad46fc0
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|
717 yield r |
39179
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|
718 |
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diff
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|
719 def headrevs(revs, parentsfn): |
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diff
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|
720 """Resolve the set of heads from a set of revisions. |
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|
721 |
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|
722 Receives an iterable of revision numbers and a callbable that receives a |
1c3184d7e882
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38783
diff
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|
723 revision number and returns an iterable of parent revision numbers, possibly |
1c3184d7e882
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diff
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|
724 including nullrev. |
1c3184d7e882
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diff
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|
725 |
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38783
diff
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|
726 Returns a set of revision numbers that are DAG heads within the passed |
1c3184d7e882
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parents:
38783
diff
changeset
|
727 subset. |
1c3184d7e882
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diff
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|
728 |
1c3184d7e882
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38783
diff
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|
729 ``nullrev`` is never included in the returned set, even if it is provided in |
1c3184d7e882
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parents:
38783
diff
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|
730 the input set. |
1c3184d7e882
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parents:
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diff
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|
731 """ |
1c3184d7e882
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parents:
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diff
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|
732 headrevs = set(revs) |
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diff
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|
733 |
1c3184d7e882
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diff
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|
734 for rev in revs: |
1c3184d7e882
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Gregory Szorc <gregory.szorc@gmail.com>
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38783
diff
changeset
|
735 for prev in parentsfn(rev): |
1c3184d7e882
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parents:
38783
diff
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|
736 headrevs.discard(prev) |
1c3184d7e882
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diff
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|
737 |
1c3184d7e882
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diff
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|
738 headrevs.discard(node.nullrev) |
1c3184d7e882
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|
739 |
1c3184d7e882
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38783
diff
changeset
|
740 return headrevs |
39181
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|
741 |
0a934ee94f09
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diff
changeset
|
742 def linearize(revs, parentsfn): |
0a934ee94f09
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diff
changeset
|
743 """Linearize and topologically sort a list of revisions. |
0a934ee94f09
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diff
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|
744 |
39607
5362c96f2feb
dagop: fix typo spotted while doing unrelated investigation
Augie Fackler <augie@google.com>
parents:
39181
diff
changeset
|
745 The linearization process tries to create long runs of revs where a child |
39181
0a934ee94f09
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39179
diff
changeset
|
746 rev comes immediately after its first parent. This is done by visiting the |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
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parents:
39179
diff
changeset
|
747 heads of the revs in inverse topological order, and for each visited rev, |
0a934ee94f09
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39179
diff
changeset
|
748 visiting its second parent, then its first parent, then adding the rev |
0a934ee94f09
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diff
changeset
|
749 itself to the output list. |
0a934ee94f09
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39179
diff
changeset
|
750 |
0a934ee94f09
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parents:
39179
diff
changeset
|
751 Returns a list of revision numbers. |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
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39179
diff
changeset
|
752 """ |
0a934ee94f09
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diff
changeset
|
753 visit = list(sorted(headrevs(revs, parentsfn), reverse=True)) |
0a934ee94f09
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parents:
39179
diff
changeset
|
754 finished = set() |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
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parents:
39179
diff
changeset
|
755 result = [] |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
Gregory Szorc <gregory.szorc@gmail.com>
parents:
39179
diff
changeset
|
756 |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
Gregory Szorc <gregory.szorc@gmail.com>
parents:
39179
diff
changeset
|
757 while visit: |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
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parents:
39179
diff
changeset
|
758 rev = visit.pop() |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
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parents:
39179
diff
changeset
|
759 if rev < 0: |
0a934ee94f09
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
39179
diff
changeset
|
760 rev = -rev - 1 |
0a934ee94f09
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
39179
diff
changeset
|
761 |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
Gregory Szorc <gregory.szorc@gmail.com>
parents:
39179
diff
changeset
|
762 if rev not in finished: |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
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diff
changeset
|
763 result.append(rev) |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
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39179
diff
changeset
|
764 finished.add(rev) |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
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39179
diff
changeset
|
765 |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
Gregory Szorc <gregory.szorc@gmail.com>
parents:
39179
diff
changeset
|
766 else: |
0a934ee94f09
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39179
diff
changeset
|
767 visit.append(-rev - 1) |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
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39179
diff
changeset
|
768 |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
Gregory Szorc <gregory.szorc@gmail.com>
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39179
diff
changeset
|
769 for prev in parentsfn(rev): |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
Gregory Szorc <gregory.szorc@gmail.com>
parents:
39179
diff
changeset
|
770 if prev == node.nullrev or prev not in revs or prev in finished: |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
Gregory Szorc <gregory.szorc@gmail.com>
parents:
39179
diff
changeset
|
771 continue |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
Gregory Szorc <gregory.szorc@gmail.com>
parents:
39179
diff
changeset
|
772 |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
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parents:
39179
diff
changeset
|
773 visit.append(prev) |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
Gregory Szorc <gregory.szorc@gmail.com>
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39179
diff
changeset
|
774 |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
Gregory Szorc <gregory.szorc@gmail.com>
parents:
39179
diff
changeset
|
775 assert len(result) == len(revs) |
0a934ee94f09
dagop: port revlogdag.linearize() to standalone function
Gregory Szorc <gregory.szorc@gmail.com>
parents:
39179
diff
changeset
|
776 |
0a934ee94f09
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Gregory Szorc <gregory.szorc@gmail.com>
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39179
diff
changeset
|
777 return result |