Mercurial > hg
annotate mercurial/pure/parsers.py @ 27339:6ab8c6511a6a
parsers: use absolute_import
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sat, 12 Dec 2015 13:39:29 -0500 |
parents | 4ece2847cf4c |
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1 # parsers.py - Python implementation of parsers.c |
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2 # |
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3 # Copyright 2009 Matt Mackall <mpm@selenic.com> and others |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import cStringIO |
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11 import struct |
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12 import zlib |
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13 |
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14 from .node import nullid |
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15 |
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16 _pack = struct.pack |
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17 _unpack = struct.unpack |
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18 _compress = zlib.compress |
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19 _decompress = zlib.decompress |
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20 |
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21 # Some code below makes tuples directly because it's more convenient. However, |
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22 # code outside this module should always use dirstatetuple. |
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23 def dirstatetuple(*x): |
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24 # x is a tuple |
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25 return x |
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26 |
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27 def parse_index2(data, inline): |
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28 def gettype(q): |
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29 return int(q & 0xFFFF) |
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30 |
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31 def offset_type(offset, type): |
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32 return long(long(offset) << 16 | type) |
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33 |
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34 indexformatng = ">Qiiiiii20s12x" |
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35 |
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36 s = struct.calcsize(indexformatng) |
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37 index = [] |
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38 cache = None |
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39 off = 0 |
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41 l = len(data) - s |
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42 append = index.append |
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43 if inline: |
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44 cache = (0, data) |
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45 while off <= l: |
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46 e = _unpack(indexformatng, data[off:off + s]) |
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47 append(e) |
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48 if e[1] < 0: |
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49 break |
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50 off += e[1] + s |
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51 else: |
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52 while off <= l: |
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53 e = _unpack(indexformatng, data[off:off + s]) |
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54 append(e) |
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55 off += s |
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56 |
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57 if off != len(data): |
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58 raise ValueError('corrupt index file') |
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59 |
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60 if index: |
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61 e = list(index[0]) |
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62 type = gettype(e[0]) |
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63 e[0] = offset_type(0, type) |
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64 index[0] = tuple(e) |
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65 |
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66 # add the magic null revision at -1 |
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67 index.append((0, 0, 0, -1, -1, -1, -1, nullid)) |
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68 |
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69 return index, cache |
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70 |
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71 def parse_dirstate(dmap, copymap, st): |
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72 parents = [st[:20], st[20: 40]] |
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73 # dereference fields so they will be local in loop |
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74 format = ">cllll" |
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75 e_size = struct.calcsize(format) |
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76 pos1 = 40 |
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77 l = len(st) |
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78 |
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79 # the inner loop |
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80 while pos1 < l: |
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81 pos2 = pos1 + e_size |
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82 e = _unpack(">cllll", st[pos1:pos2]) # a literal here is faster |
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83 pos1 = pos2 + e[4] |
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84 f = st[pos2:pos1] |
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85 if '\0' in f: |
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86 f, c = f.split('\0') |
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87 copymap[f] = c |
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88 dmap[f] = e[:4] |
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89 return parents |
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90 |
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91 def pack_dirstate(dmap, copymap, pl, now): |
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92 now = int(now) |
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93 cs = cStringIO.StringIO() |
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94 write = cs.write |
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95 write("".join(pl)) |
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96 for f, e in dmap.iteritems(): |
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97 if e[0] == 'n' and e[3] == now: |
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98 # The file was last modified "simultaneously" with the current |
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99 # write to dirstate (i.e. within the same second for file- |
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100 # systems with a granularity of 1 sec). This commonly happens |
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101 # for at least a couple of files on 'update'. |
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102 # The user could change the file without changing its size |
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103 # within the same second. Invalidate the file's mtime in |
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104 # dirstate, forcing future 'status' calls to compare the |
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105 # contents of the file if the size is the same. This prevents |
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106 # mistakenly treating such files as clean. |
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107 e = dirstatetuple(e[0], e[1], e[2], -1) |
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108 dmap[f] = e |
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109 |
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110 if f in copymap: |
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111 f = "%s\0%s" % (f, copymap[f]) |
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112 e = _pack(">cllll", e[0], e[1], e[2], e[3], len(f)) |
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113 write(e) |
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114 write(f) |
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115 return cs.getvalue() |