Mercurial > public > mercurial-scm > hg
annotate mercurial/manifest.py @ 1089:142b5d5ec9cc
Break apart hg.py
- move the various parts of hg.py into their own files
- create node.py to store node manipulation functions
| author | mpm@selenic.com |
|---|---|
| date | Sat, 27 Aug 2005 14:21:25 -0700 |
| parents | mercurial/hg.py@05dc7aba22eb |
| children | 50a0a36dd48a |
| rev | line source |
|---|---|
| 1089 | 1 # manifest.py - manifest revision class for mercurial |
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2 # |
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3 # Copyright 2005 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 |
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6 # of the GNU General Public License, incorporated herein by reference. |
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7 |
| 1089 | 8 import sys, struct |
| 262 | 9 from revlog import * |
| 10 from demandload import * | |
| 1089 | 11 demandload(globals(), "bisect") |
| 79 | 12 |
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13 class manifest(revlog): |
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14 def __init__(self, opener): |
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15 self.mapcache = None |
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16 self.listcache = None |
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17 self.addlist = None |
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18 revlog.__init__(self, opener, "00manifest.i", "00manifest.d") |
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19 |
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20 def read(self, node): |
| 313 | 21 if node == nullid: return {} # don't upset local cache |
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22 if self.mapcache and self.mapcache[0] == node: |
| 561 | 23 return self.mapcache[1] |
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24 text = self.revision(node) |
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25 map = {} |
| 276 | 26 flag = {} |
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27 self.listcache = (text, text.splitlines(1)) |
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28 for l in self.listcache[1]: |
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29 (f, n) = l.split('\0') |
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30 map[f] = bin(n[:40]) |
| 276 | 31 flag[f] = (n[40:-1] == "x") |
| 32 self.mapcache = (node, map, flag) | |
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33 return map |
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34 |
| 276 | 35 def readflags(self, node): |
| 313 | 36 if node == nullid: return {} # don't upset local cache |
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37 if not self.mapcache or self.mapcache[0] != node: |
| 276 | 38 self.read(node) |
| 39 return self.mapcache[2] | |
| 40 | |
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41 def diff(self, a, b): |
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42 # this is sneaky, as we're not actually using a and b |
| 140 | 43 if self.listcache and self.addlist and self.listcache[0] == a: |
| 98 | 44 d = mdiff.diff(self.listcache[1], self.addlist, 1) |
| 45 if mdiff.patch(a, d) != b: | |
| 46 sys.stderr.write("*** sortdiff failed, falling back ***\n") | |
| 47 return mdiff.textdiff(a, b) | |
| 48 return d | |
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49 else: |
| 44 | 50 return mdiff.textdiff(a, b) |
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51 |
| 741 | 52 def add(self, map, flags, transaction, link, p1=None, p2=None, |
| 53 changed=None): | |
| 644 | 54 # directly generate the mdiff delta from the data collected during |
| 55 # the bisect loop below | |
| 56 def gendelta(delta): | |
| 57 i = 0 | |
| 58 result = [] | |
| 59 while i < len(delta): | |
| 60 start = delta[i][2] | |
| 61 end = delta[i][3] | |
| 62 l = delta[i][4] | |
| 63 if l == None: | |
| 64 l = "" | |
| 741 | 65 while i < len(delta) - 1 and start <= delta[i+1][2] \ |
| 66 and end >= delta[i+1][2]: | |
| 644 | 67 if delta[i+1][3] > end: |
| 68 end = delta[i+1][3] | |
| 69 if delta[i+1][4]: | |
| 70 l += delta[i+1][4] | |
| 71 i += 1 | |
| 72 result.append(struct.pack(">lll", start, end, len(l)) + l) | |
| 73 i += 1 | |
| 74 return result | |
| 75 | |
| 76 # apply the changes collected during the bisect loop to our addlist | |
| 77 def addlistdelta(addlist, delta): | |
| 78 # apply the deltas to the addlist. start from the bottom up | |
| 79 # so changes to the offsets don't mess things up. | |
| 80 i = len(delta) | |
| 81 while i > 0: | |
| 82 i -= 1 | |
| 83 start = delta[i][0] | |
| 84 end = delta[i][1] | |
| 85 if delta[i][4]: | |
| 86 addlist[start:end] = [delta[i][4]] | |
| 87 else: | |
| 88 del addlist[start:end] | |
| 89 return addlist | |
| 90 | |
| 91 # calculate the byte offset of the start of each line in the | |
| 92 # manifest | |
| 93 def calcoffsets(addlist): | |
| 94 offsets = [0] * (len(addlist) + 1) | |
| 95 offset = 0 | |
| 96 i = 0 | |
| 97 while i < len(addlist): | |
| 98 offsets[i] = offset | |
| 99 offset += len(addlist[i]) | |
| 100 i += 1 | |
| 101 offsets[i] = offset | |
| 102 return offsets | |
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103 |
| 644 | 104 # if we're using the listcache, make sure it is valid and |
| 105 # parented by the same node we're diffing against | |
| 741 | 106 if not changed or not self.listcache or not p1 or \ |
| 107 self.mapcache[0] != p1: | |
| 644 | 108 files = map.keys() |
| 109 files.sort() | |
| 110 | |
| 111 self.addlist = ["%s\000%s%s\n" % | |
| 112 (f, hex(map[f]), flags[f] and "x" or '') | |
| 113 for f in files] | |
| 114 cachedelta = None | |
| 115 else: | |
| 116 addlist = self.listcache[1] | |
| 117 | |
| 118 # find the starting offset for each line in the add list | |
| 119 offsets = calcoffsets(addlist) | |
| 120 | |
| 121 # combine the changed lists into one list for sorting | |
| 122 work = [[x, 0] for x in changed[0]] | |
| 123 work[len(work):] = [[x, 1] for x in changed[1]] | |
| 124 work.sort() | |
| 125 | |
| 126 delta = [] | |
| 127 bs = 0 | |
| 128 | |
| 129 for w in work: | |
| 130 f = w[0] | |
| 741 | 131 # bs will either be the index of the item or the insert point |
| 644 | 132 bs = bisect.bisect(addlist, f, bs) |
| 133 if bs < len(addlist): | |
| 134 fn = addlist[bs][:addlist[bs].index('\0')] | |
| 135 else: | |
| 136 fn = None | |
| 137 if w[1] == 0: | |
| 741 | 138 l = "%s\000%s%s\n" % (f, hex(map[f]), |
| 139 flags[f] and "x" or '') | |
| 644 | 140 else: |
| 141 l = None | |
| 142 start = bs | |
| 143 if fn != f: | |
| 144 # item not found, insert a new one | |
| 659 | 145 end = bs |
| 644 | 146 if w[1] == 1: |
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147 sys.stderr.write("failed to remove %s from manifest\n" |
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148 % f) |
| 644 | 149 sys.exit(1) |
| 150 else: | |
| 151 # item is found, replace/delete the existing line | |
| 152 end = bs + 1 | |
| 153 delta.append([start, end, offsets[start], offsets[end], l]) | |
| 154 | |
| 155 self.addlist = addlistdelta(addlist, delta) | |
| 156 if self.mapcache[0] == self.tip(): | |
| 157 cachedelta = "".join(gendelta(delta)) | |
| 158 else: | |
| 159 cachedelta = None | |
| 160 | |
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161 text = "".join(self.addlist) |
| 644 | 162 if cachedelta and mdiff.patch(self.listcache[0], cachedelta) != text: |
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163 sys.stderr.write("manifest delta failure\n") |
| 644 | 164 sys.exit(1) |
| 165 n = self.addrevision(text, transaction, link, p1, p2, cachedelta) | |
| 302 | 166 self.mapcache = (n, map, flags) |
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167 self.listcache = (text, self.addlist) |
| 140 | 168 self.addlist = None |
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169 |
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170 return n |