Mercurial > hg
annotate mercurial/pure/parsers.py @ 29942:3664537386ab
crecord: delete commented line
author | Nathan Goldbaum <ngoldbau@illinois.edu> |
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date | Wed, 14 Sep 2016 11:39:47 -0500 |
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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 struct |
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11 import zlib |
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12 |
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13 from .node import nullid |
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14 from . import pycompat |
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15 stringio = pycompat.stringio |
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16 |
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17 _pack = struct.pack |
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18 _unpack = struct.unpack |
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19 _compress = zlib.compress |
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20 _decompress = zlib.decompress |
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21 |
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22 # Some code below makes tuples directly because it's more convenient. However, |
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23 # code outside this module should always use dirstatetuple. |
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24 def dirstatetuple(*x): |
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25 # x is a tuple |
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26 return x |
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27 |
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28 indexformatng = ">Qiiiiii20s12x" |
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29 indexfirst = struct.calcsize('Q') |
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30 sizeint = struct.calcsize('i') |
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31 indexsize = struct.calcsize(indexformatng) |
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32 |
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33 def gettype(q): |
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34 return int(q & 0xFFFF) |
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35 |
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36 def offset_type(offset, type): |
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37 return long(long(offset) << 16 | type) |
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38 |
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39 class BaseIndexObject(object): |
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40 def __len__(self): |
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41 return self._lgt + len(self._extra) + 1 |
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42 |
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43 def insert(self, i, tup): |
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44 assert i == -1 |
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45 self._extra.append(tup) |
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46 |
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47 def _fix_index(self, i): |
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48 if not isinstance(i, int): |
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49 raise TypeError("expecting int indexes") |
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50 if i < 0: |
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51 i = len(self) + i |
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52 if i < 0 or i >= len(self): |
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53 raise IndexError |
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54 return i |
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55 |
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56 def __getitem__(self, i): |
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57 i = self._fix_index(i) |
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58 if i == len(self) - 1: |
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59 return (0, 0, 0, -1, -1, -1, -1, nullid) |
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60 if i >= self._lgt: |
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61 return self._extra[i - self._lgt] |
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62 index = self._calculate_index(i) |
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63 r = struct.unpack(indexformatng, self._data[index:index + indexsize]) |
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64 if i == 0: |
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65 e = list(r) |
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66 type = gettype(e[0]) |
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67 e[0] = offset_type(0, type) |
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68 return tuple(e) |
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69 return r |
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70 |
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71 class IndexObject(BaseIndexObject): |
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72 def __init__(self, data): |
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73 assert len(data) % indexsize == 0 |
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74 self._data = data |
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75 self._lgt = len(data) // indexsize |
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76 self._extra = [] |
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77 |
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78 def _calculate_index(self, i): |
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79 return i * indexsize |
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81 def __delitem__(self, i): |
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82 if not isinstance(i, slice) or not i.stop == -1 or not i.step is None: |
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83 raise ValueError("deleting slices only supports a:-1 with step 1") |
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84 i = self._fix_index(i.start) |
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85 if i < self._lgt: |
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86 self._data = self._data[:i * indexsize] |
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87 self._lgt = i |
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88 self._extra = [] |
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89 else: |
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90 self._extra = self._extra[:i - self._lgt] |
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91 |
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92 class InlinedIndexObject(BaseIndexObject): |
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93 def __init__(self, data, inline=0): |
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94 self._data = data |
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95 self._lgt = self._inline_scan(None) |
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96 self._inline_scan(self._lgt) |
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97 self._extra = [] |
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98 |
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99 def _inline_scan(self, lgt): |
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100 off = 0 |
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101 if lgt is not None: |
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102 self._offsets = [0] * lgt |
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103 count = 0 |
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104 while off <= len(self._data) - indexsize: |
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105 s, = struct.unpack('>i', |
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106 self._data[off + indexfirst:off + sizeint + indexfirst]) |
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107 if lgt is not None: |
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108 self._offsets[count] = off |
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109 count += 1 |
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110 off += indexsize + s |
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111 if off != len(self._data): |
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112 raise ValueError("corrupted data") |
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113 return count |
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114 |
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115 def __delitem__(self, i): |
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116 if not isinstance(i, slice) or not i.stop == -1 or not i.step is None: |
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117 raise ValueError("deleting slices only supports a:-1 with step 1") |
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118 i = self._fix_index(i.start) |
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119 if i < self._lgt: |
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120 self._offsets = self._offsets[:i] |
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121 self._lgt = i |
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122 self._extra = [] |
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123 else: |
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124 self._extra = self._extra[:i - self._lgt] |
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125 |
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126 def _calculate_index(self, i): |
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127 return self._offsets[i] |
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128 |
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129 def parse_index2(data, inline): |
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130 if not inline: |
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131 return IndexObject(data), None |
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132 return InlinedIndexObject(data, inline), (0, data) |
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133 |
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134 def parse_dirstate(dmap, copymap, st): |
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135 parents = [st[:20], st[20: 40]] |
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136 # dereference fields so they will be local in loop |
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137 format = ">cllll" |
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138 e_size = struct.calcsize(format) |
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139 pos1 = 40 |
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140 l = len(st) |
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141 |
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142 # the inner loop |
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143 while pos1 < l: |
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144 pos2 = pos1 + e_size |
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145 e = _unpack(">cllll", st[pos1:pos2]) # a literal here is faster |
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146 pos1 = pos2 + e[4] |
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147 f = st[pos2:pos1] |
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148 if '\0' in f: |
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149 f, c = f.split('\0') |
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150 copymap[f] = c |
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151 dmap[f] = e[:4] |
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152 return parents |
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153 |
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154 def pack_dirstate(dmap, copymap, pl, now): |
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155 now = int(now) |
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156 cs = stringio() |
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157 write = cs.write |
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158 write("".join(pl)) |
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159 for f, e in dmap.iteritems(): |
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160 if e[0] == 'n' and e[3] == now: |
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161 # The file was last modified "simultaneously" with the current |
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162 # write to dirstate (i.e. within the same second for file- |
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163 # systems with a granularity of 1 sec). This commonly happens |
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164 # for at least a couple of files on 'update'. |
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165 # The user could change the file without changing its size |
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166 # within the same second. Invalidate the file's mtime in |
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167 # dirstate, forcing future 'status' calls to compare the |
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168 # contents of the file if the size is the same. This prevents |
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169 # mistakenly treating such files as clean. |
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170 e = dirstatetuple(e[0], e[1], e[2], -1) |
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171 dmap[f] = e |
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172 |
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173 if f in copymap: |
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174 f = "%s\0%s" % (f, copymap[f]) |
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175 e = _pack(">cllll", e[0], e[1], e[2], e[3], len(f)) |
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176 write(e) |
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177 write(f) |
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178 return cs.getvalue() |