annotate mercurial/manifest.py @ 9385:570416319ed3

Merge with crew-stable
author Patrick Mezard <pmezard@gmail.com>
date Sun, 23 Aug 2009 13:03:10 +0200
parents beae42f3d93b
children a5adf55ee533
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1 # manifest.py - manifest revision class for mercurial
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2 #
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3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2, incorporated herein by reference.
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7
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8 from i18n import _
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9 import mdiff, parsers, error, revlog
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10 import array, struct
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11
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12 class manifestdict(dict):
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13 def __init__(self, mapping=None, flags=None):
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14 if mapping is None: mapping = {}
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15 if flags is None: flags = {}
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16 dict.__init__(self, mapping)
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17 self._flags = flags
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18 def flags(self, f):
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19 return self._flags.get(f, "")
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20 def set(self, f, flags):
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21 self._flags[f] = flags
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22 def copy(self):
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23 return manifestdict(dict.copy(self), dict.copy(self._flags))
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24
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25 class manifest(revlog.revlog):
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26 def __init__(self, opener):
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27 self.mapcache = None
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28 self.listcache = None
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29 revlog.revlog.__init__(self, opener, "00manifest.i")
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30
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31 def parse(self, lines):
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32 mfdict = manifestdict()
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33 parsers.parse_manifest(mfdict, mfdict._flags, lines)
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34 return mfdict
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35
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36 def readdelta(self, node):
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37 r = self.rev(node)
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38 return self.parse(mdiff.patchtext(self.revdiff(r - 1, r)))
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39
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40 def read(self, node):
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41 if node == revlog.nullid:
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42 return manifestdict() # don't upset local cache
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43 if self.mapcache and self.mapcache[0] == node:
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44 return self.mapcache[1]
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45 text = self.revision(node)
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46 self.listcache = array.array('c', text)
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47 mapping = self.parse(text)
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48 self.mapcache = (node, mapping)
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49 return mapping
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50
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51 def _search(self, m, s, lo=0, hi=None):
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52 '''return a tuple (start, end) that says where to find s within m.
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53
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54 If the string is found m[start:end] are the line containing
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55 that string. If start == end the string was not found and
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56 they indicate the proper sorted insertion point. This was
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57 taken from bisect_left, and modified to find line start/end as
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58 it goes along.
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59
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60 m should be a buffer or a string
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61 s is a string'''
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62 def advance(i, c):
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63 while i < lenm and m[i] != c:
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64 i += 1
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65 return i
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66 if not s:
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67 return (lo, lo)
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68 lenm = len(m)
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69 if not hi:
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70 hi = lenm
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71 while lo < hi:
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72 mid = (lo + hi) // 2
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73 start = mid
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74 while start > 0 and m[start-1] != '\n':
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75 start -= 1
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76 end = advance(start, '\0')
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77 if m[start:end] < s:
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78 # we know that after the null there are 40 bytes of sha1
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79 # this translates to the bisect lo = mid + 1
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80 lo = advance(end + 40, '\n') + 1
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81 else:
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82 # this translates to the bisect hi = mid
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83 hi = start
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84 end = advance(lo, '\0')
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85 found = m[lo:end]
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86 if cmp(s, found) == 0:
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87 # we know that after the null there are 40 bytes of sha1
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88 end = advance(end + 40, '\n')
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89 return (lo, end+1)
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90 else:
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91 return (lo, lo)
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92
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93 def find(self, node, f):
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94 '''look up entry for a single file efficiently.
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95 return (node, flags) pair if found, (None, None) if not.'''
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96 if self.mapcache and node == self.mapcache[0]:
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97 return self.mapcache[1].get(f), self.mapcache[1].flags(f)
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98 text = self.revision(node)
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99 start, end = self._search(text, f)
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100 if start == end:
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101 return None, None
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102 l = text[start:end]
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103 f, n = l.split('\0')
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104 return revlog.bin(n[:40]), n[40:-1]
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105
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106 def add(self, map, transaction, link, p1=None, p2=None,
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107 changed=None):
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108 # apply the changes collected during the bisect loop to our addlist
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109 # return a delta suitable for addrevision
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110 def addlistdelta(addlist, x):
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111 # start from the bottom up
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112 # so changes to the offsets don't mess things up.
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113 i = len(x)
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114 while i > 0:
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115 i -= 1
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116 start = x[i][0]
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117 end = x[i][1]
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118 if x[i][2]:
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119 addlist[start:end] = array.array('c', x[i][2])
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120 else:
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121 del addlist[start:end]
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122 return "".join([struct.pack(">lll", d[0], d[1], len(d[2])) + d[2]
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123 for d in x ])
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124
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125 def checkforbidden(l):
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126 for f in l:
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127 if '\n' in f or '\r' in f:
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128 raise error.RevlogError(
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129 _("'\\n' and '\\r' disallowed in filenames: %r") % f)
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130
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131 # if we're using the listcache, make sure it is valid and
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132 # parented by the same node we're diffing against
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133 if not (changed and self.listcache and p1 and self.mapcache[0] == p1):
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134 files = sorted(map)
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135 checkforbidden(files)
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136
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137 # if this is changed to support newlines in filenames,
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138 # be sure to check the templates/ dir again (especially *-raw.tmpl)
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139 hex, flags = revlog.hex, map.flags
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140 text = ["%s\000%s%s\n" % (f, hex(map[f]), flags(f))
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141 for f in files]
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142 self.listcache = array.array('c', "".join(text))
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143 cachedelta = None
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144 else:
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145 addlist = self.listcache
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146
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147 checkforbidden(changed[0])
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148 # combine the changed lists into one list for sorting
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149 work = [[x, 0] for x in changed[0]]
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150 work[len(work):] = [[x, 1] for x in changed[1]]
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151 work.sort()
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152
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153 delta = []
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154 dstart = None
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155 dend = None
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156 dline = [""]
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157 start = 0
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158 # zero copy representation of addlist as a buffer
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159 addbuf = buffer(addlist)
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160
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161 # start with a readonly loop that finds the offset of
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162 # each line and creates the deltas
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163 for w in work:
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164 f = w[0]
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165 # bs will either be the index of the item or the insert point
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166 start, end = self._search(addbuf, f, start)
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167 if w[1] == 0:
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168 l = "%s\000%s%s\n" % (f, revlog.hex(map[f]), map.flags(f))
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169 else:
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170 l = ""
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171 if start == end and w[1] == 1:
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172 # item we want to delete was not found, error out
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173 raise AssertionError(
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174 _("failed to remove %s from manifest") % f)
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175 if dstart != None and dstart <= start and dend >= start:
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176 if dend < end:
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177 dend = end
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178 if l:
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179 dline.append(l)
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180 else:
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181 if dstart != None:
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182 delta.append([dstart, dend, "".join(dline)])
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183 dstart = start
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184 dend = end
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185 dline = [l]
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186
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187 if dstart != None:
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188 delta.append([dstart, dend, "".join(dline)])
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189 # apply the delta to the addlist, and get a delta for addrevision
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190 cachedelta = addlistdelta(addlist, delta)
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191
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192 # the delta is only valid if we've been processing the tip revision
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193 if self.mapcache[0] != self.tip():
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194 cachedelta = None
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195 self.listcache = addlist
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196
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197 n = self.addrevision(buffer(self.listcache), transaction, link,
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198 p1, p2, cachedelta)
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199 self.mapcache = (n, map)
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parents:
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200
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201 return n