Mercurial > hg
annotate mercurial/pure/parsers.py @ 26636:ff6baf32b3ba
revset: eliminate temporary reference to subset in limit() and last()
author | Yuya Nishihara <yuya@tcha.org> |
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date | Mon, 12 Oct 2015 17:14:47 +0900 |
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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 mercurial.node import nullid |
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9 import struct, zlib, cStringIO |
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10 |
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11 _pack = struct.pack |
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12 _unpack = struct.unpack |
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13 _compress = zlib.compress |
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14 _decompress = zlib.decompress |
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15 |
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16 # Some code below makes tuples directly because it's more convenient. However, |
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17 # code outside this module should always use dirstatetuple. |
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18 def dirstatetuple(*x): |
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19 # x is a tuple |
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20 return x |
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21 |
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22 def parse_index2(data, inline): |
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23 def gettype(q): |
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24 return int(q & 0xFFFF) |
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25 |
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26 def offset_type(offset, type): |
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27 return long(long(offset) << 16 | type) |
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28 |
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29 indexformatng = ">Qiiiiii20s12x" |
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30 |
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31 s = struct.calcsize(indexformatng) |
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32 index = [] |
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33 cache = None |
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34 off = 0 |
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36 l = len(data) - s |
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37 append = index.append |
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38 if inline: |
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39 cache = (0, data) |
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40 while off <= l: |
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41 e = _unpack(indexformatng, data[off:off + s]) |
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42 append(e) |
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43 if e[1] < 0: |
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44 break |
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45 off += e[1] + s |
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46 else: |
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47 while off <= l: |
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48 e = _unpack(indexformatng, data[off:off + s]) |
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49 append(e) |
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50 off += s |
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51 |
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52 if off != len(data): |
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53 raise ValueError('corrupt index file') |
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54 |
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55 if index: |
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56 e = list(index[0]) |
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57 type = gettype(e[0]) |
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58 e[0] = offset_type(0, type) |
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59 index[0] = tuple(e) |
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60 |
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61 # add the magic null revision at -1 |
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62 index.append((0, 0, 0, -1, -1, -1, -1, nullid)) |
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63 |
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64 return index, cache |
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65 |
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66 def parse_dirstate(dmap, copymap, st): |
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67 parents = [st[:20], st[20: 40]] |
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68 # dereference fields so they will be local in loop |
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69 format = ">cllll" |
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70 e_size = struct.calcsize(format) |
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71 pos1 = 40 |
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72 l = len(st) |
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73 |
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74 # the inner loop |
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75 while pos1 < l: |
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76 pos2 = pos1 + e_size |
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77 e = _unpack(">cllll", st[pos1:pos2]) # a literal here is faster |
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78 pos1 = pos2 + e[4] |
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79 f = st[pos2:pos1] |
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80 if '\0' in f: |
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81 f, c = f.split('\0') |
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82 copymap[f] = c |
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83 dmap[f] = e[:4] |
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84 return parents |
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85 |
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86 def pack_dirstate(dmap, copymap, pl, now): |
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87 now = int(now) |
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88 cs = cStringIO.StringIO() |
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89 write = cs.write |
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90 write("".join(pl)) |
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91 for f, e in dmap.iteritems(): |
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92 if e[0] == 'n' and e[3] == now: |
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93 # The file was last modified "simultaneously" with the current |
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94 # write to dirstate (i.e. within the same second for file- |
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95 # systems with a granularity of 1 sec). This commonly happens |
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96 # for at least a couple of files on 'update'. |
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97 # The user could change the file without changing its size |
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98 # within the same second. Invalidate the file's mtime in |
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99 # dirstate, forcing future 'status' calls to compare the |
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100 # contents of the file if the size is the same. This prevents |
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101 # mistakenly treating such files as clean. |
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102 e = dirstatetuple(e[0], e[1], e[2], -1) |
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103 dmap[f] = e |
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104 |
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105 if f in copymap: |
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106 f = "%s\0%s" % (f, copymap[f]) |
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107 e = _pack(">cllll", e[0], e[1], e[2], e[3], len(f)) |
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108 write(e) |
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109 write(f) |
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110 return cs.getvalue() |