author | Matt Harbison <matt_harbison@yahoo.com> |
Sun, 15 Apr 2018 22:28:03 -0400 | |
changeset 37710 | 0a5fe2a08e82 |
parent 32291 | bd872f64a8ba |
child 38595 | f8b46245b26a |
permissions | -rw-r--r-- |
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# ancestor.py - generic DAG ancestor algorithm for mercurial |
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Abstract ancestor algorithm into generic function
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# |
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Abstract ancestor algorithm into generic function
Matt Mackall <mpm@selenic.com>
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# Copyright 2006 Matt Mackall <mpm@selenic.com> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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from __future__ import absolute_import |
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import collections |
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import heapq |
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from .node import nullrev |
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def commonancestorsheads(pfunc, *nodes): |
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"""Returns a set with the heads of all common ancestors of all nodes, |
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heads(::nodes[0] and ::nodes[1] and ...) . |
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pfunc must return a list of parent vertices for a given vertex. |
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""" |
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if not isinstance(nodes, set): |
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nodes = set(nodes) |
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if nullrev in nodes: |
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return set() |
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if len(nodes) <= 1: |
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return nodes |
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allseen = (1 << len(nodes)) - 1 |
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seen = [0] * (max(nodes) + 1) |
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for i, n in enumerate(nodes): |
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seen[n] = 1 << i |
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poison = 1 << (i + 1) |
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|
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gca = set() |
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interesting = len(nodes) |
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nv = len(seen) - 1 |
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while nv >= 0 and interesting: |
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v = nv |
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nv -= 1 |
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if not seen[v]: |
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continue |
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sv = seen[v] |
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if sv < poison: |
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interesting -= 1 |
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if sv == allseen: |
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gca.add(v) |
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sv |= poison |
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if v in nodes: |
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# history is linear |
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return {v} |
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if sv < poison: |
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for p in pfunc(v): |
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sp = seen[p] |
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if p == nullrev: |
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continue |
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if sp == 0: |
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seen[p] = sv |
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interesting += 1 |
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elif sp != sv: |
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seen[p] |= sv |
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else: |
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for p in pfunc(v): |
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if p == nullrev: |
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continue |
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sp = seen[p] |
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if sp and sp < poison: |
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interesting -= 1 |
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seen[p] = sv |
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return gca |
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def ancestors(pfunc, *orignodes): |
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""" |
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Returns the common ancestors of a and b that are furthest from a |
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root (as measured by longest path). |
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|
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pfunc must return a list of parent vertices for a given vertex. |
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""" |
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def deepest(nodes): |
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interesting = {} |
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count = max(nodes) + 1 |
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depth = [0] * count |
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seen = [0] * count |
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mapping = [] |
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for (i, n) in enumerate(sorted(nodes)): |
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depth[n] = 1 |
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b = 1 << i |
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seen[n] = b |
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interesting[b] = 1 |
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mapping.append((b, n)) |
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nv = count - 1 |
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while nv >= 0 and len(interesting) > 1: |
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v = nv |
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nv -= 1 |
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dv = depth[v] |
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if dv == 0: |
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continue |
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sv = seen[v] |
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for p in pfunc(v): |
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if p == nullrev: |
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continue |
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dp = depth[p] |
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nsp = sp = seen[p] |
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if dp <= dv: |
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depth[p] = dv + 1 |
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if sp != sv: |
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interesting[sv] += 1 |
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nsp = seen[p] = sv |
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if sp: |
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interesting[sp] -= 1 |
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110 |
if interesting[sp] == 0: |
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del interesting[sp] |
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112 |
elif dv == dp - 1: |
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113 |
nsp = sp | sv |
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114 |
if nsp == sp: |
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|
115 |
continue |
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|
116 |
seen[p] = nsp |
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|
117 |
interesting.setdefault(nsp, 0) |
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|
118 |
interesting[nsp] += 1 |
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|
119 |
interesting[sp] -= 1 |
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|
120 |
if interesting[sp] == 0: |
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|
121 |
del interesting[sp] |
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|
122 |
interesting[sv] -= 1 |
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|
123 |
if interesting[sv] == 0: |
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|
124 |
del interesting[sv] |
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|
125 |
|
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|
126 |
if len(interesting) != 1: |
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|
127 |
return [] |
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|
128 |
|
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|
129 |
k = 0 |
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130 |
for i in interesting: |
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|
131 |
k |= i |
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132 |
return set(n for (i, n) in mapping if k & i) |
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|
133 |
|
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|
134 |
gca = commonancestorsheads(pfunc, *orignodes) |
18986
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|
135 |
|
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|
136 |
if len(gca) <= 1: |
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|
137 |
return gca |
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|
138 |
return deepest(gca) |
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|
139 |
|
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|
140 |
class incrementalmissingancestors(object): |
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141 |
'''persistent state used to calculate missing ancestors incrementally |
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142 |
|
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|
143 |
Although similar in spirit to lazyancestors below, this is a separate class |
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|
144 |
because trying to support contains and missingancestors operations with the |
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|
145 |
same internal data structures adds needless complexity.''' |
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|
146 |
def __init__(self, pfunc, bases): |
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147 |
self.bases = set(bases) |
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148 |
if not self.bases: |
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|
149 |
self.bases.add(nullrev) |
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150 |
self.pfunc = pfunc |
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|
151 |
|
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|
152 |
def hasbases(self): |
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|
153 |
'''whether the common set has any non-trivial bases''' |
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|
154 |
return self.bases and self.bases != {nullrev} |
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|
155 |
|
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|
156 |
def addbases(self, newbases): |
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157 |
'''grow the ancestor set by adding new bases''' |
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|
158 |
self.bases.update(newbases) |
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|
159 |
|
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|
160 |
def removeancestorsfrom(self, revs): |
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161 |
'''remove all ancestors of bases from the set revs (in place)''' |
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|
162 |
bases = self.bases |
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|
163 |
pfunc = self.pfunc |
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|
164 |
revs.difference_update(bases) |
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|
165 |
# nullrev is always an ancestor |
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|
166 |
revs.discard(nullrev) |
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|
167 |
if not revs: |
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|
168 |
return |
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|
169 |
# anything in revs > start is definitely not an ancestor of bases |
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|
170 |
# revs <= start needs to be investigated |
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|
171 |
start = max(bases) |
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|
172 |
keepcount = sum(1 for r in revs if r > start) |
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|
173 |
if len(revs) == keepcount: |
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|
174 |
# no revs to consider |
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|
175 |
return |
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changeset
|
176 |
|
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|
177 |
for curr in xrange(start, min(revs) - 1, -1): |
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|
178 |
if curr not in bases: |
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|
179 |
continue |
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|
180 |
revs.discard(curr) |
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|
181 |
bases.update(pfunc(curr)) |
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|
182 |
if len(revs) == keepcount: |
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changeset
|
183 |
# no more potential revs to discard |
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changeset
|
184 |
break |
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changeset
|
185 |
|
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|
186 |
def missingancestors(self, revs): |
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|
187 |
'''return all the ancestors of revs that are not ancestors of self.bases |
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changeset
|
188 |
|
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|
189 |
This may include elements from revs. |
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changeset
|
190 |
|
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changeset
|
191 |
Equivalent to the revset (::revs - ::self.bases). Revs are returned in |
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changeset
|
192 |
revision number order, which is a topological order.''' |
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changeset
|
193 |
revsvisit = set(revs) |
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|
194 |
basesvisit = self.bases |
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|
195 |
pfunc = self.pfunc |
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|
196 |
bothvisit = revsvisit.intersection(basesvisit) |
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changeset
|
197 |
revsvisit.difference_update(bothvisit) |
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|
198 |
if not revsvisit: |
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|
199 |
return [] |
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changeset
|
200 |
|
23334
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changeset
|
201 |
start = max(max(revsvisit), max(basesvisit)) |
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changeset
|
202 |
# At this point, we hold the invariants that: |
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changeset
|
203 |
# - revsvisit is the set of nodes we know are an ancestor of at least |
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|
204 |
# one of the nodes in revs |
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changeset
|
205 |
# - basesvisit is the same for bases |
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changeset
|
206 |
# - bothvisit is the set of nodes we know are ancestors of at least one |
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|
207 |
# of the nodes in revs and one of the nodes in bases. bothvisit and |
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changeset
|
208 |
# revsvisit are mutually exclusive, but bothvisit is a subset of |
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changeset
|
209 |
# basesvisit. |
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|
210 |
# Now we walk down in reverse topo order, adding parents of nodes |
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changeset
|
211 |
# already visited to the sets while maintaining the invariants. When a |
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changeset
|
212 |
# node is found in both revsvisit and basesvisit, it is removed from |
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changeset
|
213 |
# revsvisit and added to bothvisit. When revsvisit becomes empty, there |
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changeset
|
214 |
# are no more ancestors of revs that aren't also ancestors of bases, so |
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changeset
|
215 |
# exit. |
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changeset
|
216 |
|
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changeset
|
217 |
missing = [] |
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changeset
|
218 |
for curr in xrange(start, nullrev, -1): |
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changeset
|
219 |
if not revsvisit: |
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changeset
|
220 |
break |
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changeset
|
221 |
|
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|
222 |
if curr in bothvisit: |
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|
223 |
bothvisit.remove(curr) |
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|
224 |
# curr's parents might have made it into revsvisit through |
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|
225 |
# another path |
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|
226 |
for p in pfunc(curr): |
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|
227 |
revsvisit.discard(p) |
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|
228 |
basesvisit.add(p) |
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|
229 |
bothvisit.add(p) |
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|
230 |
continue |
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|
231 |
|
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|
232 |
if curr in revsvisit: |
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|
233 |
missing.append(curr) |
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|
234 |
revsvisit.remove(curr) |
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|
235 |
thisvisit = revsvisit |
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|
236 |
othervisit = basesvisit |
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|
237 |
elif curr in basesvisit: |
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|
238 |
thisvisit = basesvisit |
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|
239 |
othervisit = revsvisit |
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|
240 |
else: |
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|
241 |
# not an ancestor of revs or bases: ignore |
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|
242 |
continue |
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changeset
|
243 |
|
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|
244 |
for p in pfunc(curr): |
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|
245 |
if p == nullrev: |
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|
246 |
pass |
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|
247 |
elif p in othervisit or p in bothvisit: |
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|
248 |
# p is implicitly in thisvisit. This means p is or should be |
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|
249 |
# in bothvisit |
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|
250 |
revsvisit.discard(p) |
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|
251 |
basesvisit.add(p) |
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|
252 |
bothvisit.add(p) |
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|
253 |
else: |
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|
254 |
# visit later |
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|
255 |
thisvisit.add(p) |
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changeset
|
256 |
|
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changeset
|
257 |
missing.reverse() |
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|
258 |
return missing |
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changeset
|
259 |
|
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|
260 |
class lazyancestors(object): |
23328
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|
261 |
def __init__(self, pfunc, revs, stoprev=0, inclusive=False): |
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|
262 |
"""Create a new object generating ancestors for the given revs. Does |
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|
263 |
not generate revs lower than stoprev. |
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changeset
|
264 |
|
18091
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|
265 |
This is computed lazily starting from revs. The object supports |
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|
266 |
iteration and membership. |
18090
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changeset
|
267 |
|
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diff
changeset
|
268 |
cl should be a changelog and revs should be an iterable. inclusive is |
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|
269 |
a boolean that indicates whether revs should be included. Revs lower |
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|
270 |
than stoprev will not be generated. |
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changeset
|
271 |
|
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|
272 |
Result does not include the null revision.""" |
23328
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|
273 |
self._parentrevs = pfunc |
18090
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|
274 |
self._initrevs = revs |
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|
275 |
self._stoprev = stoprev |
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|
276 |
self._inclusive = inclusive |
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changeset
|
277 |
|
18091
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diff
changeset
|
278 |
# Initialize data structures for __contains__. |
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changeset
|
279 |
# For __contains__, we use a heap rather than a deque because |
f7f8159caad3
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changeset
|
280 |
# (a) it minimizes the number of parentrevs calls made |
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diff
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|
281 |
# (b) it makes the loop termination condition obvious |
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|
282 |
# Python's heap is a min-heap. Multiply all values by -1 to convert it |
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changeset
|
283 |
# into a max-heap. |
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changeset
|
284 |
self._containsvisit = [-rev for rev in revs] |
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changeset
|
285 |
heapq.heapify(self._containsvisit) |
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changeset
|
286 |
if inclusive: |
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|
287 |
self._containsseen = set(revs) |
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changeset
|
288 |
else: |
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changeset
|
289 |
self._containsseen = set() |
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diff
changeset
|
290 |
|
22225
baecf4e1b7d0
ancestors: add a __nonzero__ method
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
21101
diff
changeset
|
291 |
def __nonzero__(self): |
baecf4e1b7d0
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diff
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|
292 |
"""False if the set is empty, True otherwise.""" |
baecf4e1b7d0
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Pierre-Yves David <pierre-yves.david@fb.com>
parents:
21101
diff
changeset
|
293 |
try: |
29216
ead25aa27a43
py3: convert to next() function
timeless <timeless@mozdev.org>
parents:
25915
diff
changeset
|
294 |
next(iter(self)) |
22225
baecf4e1b7d0
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diff
changeset
|
295 |
return True |
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diff
changeset
|
296 |
except StopIteration: |
baecf4e1b7d0
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diff
changeset
|
297 |
return False |
baecf4e1b7d0
ancestors: add a __nonzero__ method
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
21101
diff
changeset
|
298 |
|
31476
413b44003462
py3: add __bool__ to every class defining __nonzero__
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29216
diff
changeset
|
299 |
__bool__ = __nonzero__ |
413b44003462
py3: add __bool__ to every class defining __nonzero__
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29216
diff
changeset
|
300 |
|
18090
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diff
changeset
|
301 |
def __iter__(self): |
9abc55ef85b5
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changeset
|
302 |
"""Generate the ancestors of _initrevs in reverse topological order. |
9abc55ef85b5
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diff
changeset
|
303 |
|
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diff
changeset
|
304 |
If inclusive is False, yield a sequence of revision numbers starting |
9abc55ef85b5
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diff
changeset
|
305 |
with the parents of each revision in revs, i.e., each revision is *not* |
9abc55ef85b5
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changeset
|
306 |
considered an ancestor of itself. Results are in breadth-first order: |
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diff
changeset
|
307 |
parents of each rev in revs, then parents of those, etc. |
9abc55ef85b5
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diff
changeset
|
308 |
|
9abc55ef85b5
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diff
changeset
|
309 |
If inclusive is True, yield all the revs first (ignoring stoprev), |
9abc55ef85b5
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diff
changeset
|
310 |
then yield all the ancestors of revs as when inclusive is False. |
9abc55ef85b5
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diff
changeset
|
311 |
If an element in revs is an ancestor of a different rev it is not |
9abc55ef85b5
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changeset
|
312 |
yielded again.""" |
9abc55ef85b5
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changeset
|
313 |
seen = set() |
9abc55ef85b5
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diff
changeset
|
314 |
revs = self._initrevs |
9abc55ef85b5
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diff
changeset
|
315 |
if self._inclusive: |
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changeset
|
316 |
for rev in revs: |
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changeset
|
317 |
yield rev |
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changeset
|
318 |
seen.update(revs) |
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diff
changeset
|
319 |
|
9abc55ef85b5
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diff
changeset
|
320 |
parentrevs = self._parentrevs |
9abc55ef85b5
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diff
changeset
|
321 |
stoprev = self._stoprev |
25113
0ca8410ea345
util: drop alias for collections.deque
Martin von Zweigbergk <martinvonz@google.com>
parents:
23342
diff
changeset
|
322 |
visit = collections.deque(revs) |
18090
9abc55ef85b5
revlog: move ancestor generation out to a new class
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diff
changeset
|
323 |
|
25639
7125225a5287
ancestors: prefetch method outside of the loop
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
25113
diff
changeset
|
324 |
see = seen.add |
7125225a5287
ancestors: prefetch method outside of the loop
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
25113
diff
changeset
|
325 |
schedule = visit.append |
7125225a5287
ancestors: prefetch method outside of the loop
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
25113
diff
changeset
|
326 |
|
18090
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changeset
|
327 |
while visit: |
9abc55ef85b5
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changeset
|
328 |
for parent in parentrevs(visit.popleft()): |
9abc55ef85b5
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changeset
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329 |
if parent >= stoprev and parent not in seen: |
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330 |
schedule(parent) |
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331 |
see(parent) |
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332 |
yield parent |
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333 |
|
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334 |
def __contains__(self, target): |
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335 |
"""Test whether target is an ancestor of self._initrevs.""" |
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336 |
# Trying to do both __iter__ and __contains__ using the same visit |
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337 |
# heap and seen set is complex enough that it slows down both. Keep |
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338 |
# them separate. |
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seen = self._containsseen |
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340 |
if target in seen: |
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341 |
return True |
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342 |
|
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343 |
parentrevs = self._parentrevs |
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344 |
visit = self._containsvisit |
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stoprev = self._stoprev |
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346 |
heappop = heapq.heappop |
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heappush = heapq.heappush |
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see = seen.add |
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349 |
|
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targetseen = False |
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351 |
|
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352 |
while visit and -visit[0] > target and not targetseen: |
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353 |
for parent in parentrevs(-heappop(visit)): |
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354 |
if parent < stoprev or parent in seen: |
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continue |
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356 |
# We need to make sure we push all parents into the heap so |
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# that we leave it in a consistent state for future calls. |
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358 |
heappush(visit, -parent) |
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359 |
see(parent) |
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if parent == target: |
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361 |
targetseen = True |
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362 |
|
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363 |
return targetseen |