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annotate mercurial/pure/parsers.py @ 43076:2372284d9457

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formatting: blacken the codebase This is using my patch to black (https://github.com/psf/black/pull/826) so we don't un-wrap collection literals. Done with: hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**"' | xargs black -S # skip-blame mass-reformatting only # no-check-commit reformats foo_bar functions Differential Revision: https://phab.mercurial-scm.org/D6971
author Augie Fackler <augie@google.com>
date Sun, 06 Oct 2019 09:45:02 -0400
parents 5961517fd2a8
children 687b865b95ad
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f410c552fa15 pure Python implementation of parsers.c
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1 # parsers.py - Python implementation of parsers.c
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2 #
f410c552fa15 pure Python implementation of parsers.c
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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
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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
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16 stringio = pycompat.bytesio
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17
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18
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19 _pack = struct.pack
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20 _unpack = struct.unpack
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21 _compress = zlib.compress
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22 _decompress = zlib.decompress
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23
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24 # Some code below makes tuples directly because it's more convenient. However,
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25 # code outside this module should always use dirstatetuple.
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26 def dirstatetuple(*x):
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27 # x is a tuple
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28 return x
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31 indexformatng = ">Qiiiiii20s12x"
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32 indexfirst = struct.calcsize('Q')
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33 sizeint = struct.calcsize('i')
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34 indexsize = struct.calcsize(indexformatng)
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35
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36
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37 def gettype(q):
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38 return int(q & 0xFFFF)
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41 def offset_type(offset, type):
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42 return int(int(offset) << 16 | type)
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44
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45 class BaseIndexObject(object):
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46 def __len__(self):
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47 return self._lgt + len(self._extra)
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48
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49 def append(self, tup):
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50 self._extra.append(tup)
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51
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52 def _check_index(self, i):
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53 if not isinstance(i, int):
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54 raise TypeError("expecting int indexes")
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55 if i < 0 or i >= len(self):
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56 raise IndexError
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57
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58 def __getitem__(self, i):
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59 if i == -1:
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60 return (0, 0, 0, -1, -1, -1, -1, nullid)
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61 self._check_index(i)
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62 if i >= self._lgt:
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63 return self._extra[i - self._lgt]
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64 index = self._calculate_index(i)
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65 r = struct.unpack(indexformatng, self._data[index : index + indexsize])
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66 if i == 0:
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67 e = list(r)
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68 type = gettype(e[0])
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69 e[0] = offset_type(0, type)
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70 return tuple(e)
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71 return r
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72
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73
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74 class IndexObject(BaseIndexObject):
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75 def __init__(self, data):
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76 assert len(data) % indexsize == 0
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77 self._data = data
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78 self._lgt = len(data) // indexsize
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79 self._extra = []
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80
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81 def _calculate_index(self, i):
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82 return i * indexsize
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83
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84 def __delitem__(self, i):
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85 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None:
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86 raise ValueError("deleting slices only supports a:-1 with step 1")
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87 i = i.start
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88 self._check_index(i)
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89 if i < self._lgt:
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90 self._data = self._data[: i * indexsize]
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91 self._lgt = i
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92 self._extra = []
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93 else:
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94 self._extra = self._extra[: i - self._lgt]
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95
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96
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97 class InlinedIndexObject(BaseIndexObject):
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98 def __init__(self, data, inline=0):
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99 self._data = data
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100 self._lgt = self._inline_scan(None)
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101 self._inline_scan(self._lgt)
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102 self._extra = []
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103
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104 def _inline_scan(self, lgt):
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105 off = 0
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106 if lgt is not None:
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107 self._offsets = [0] * lgt
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108 count = 0
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109 while off <= len(self._data) - indexsize:
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110 (s,) = struct.unpack(
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111 '>i', self._data[off + indexfirst : off + sizeint + indexfirst]
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112 )
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113 if lgt is not None:
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114 self._offsets[count] = off
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115 count += 1
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116 off += indexsize + s
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117 if off != len(self._data):
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118 raise ValueError("corrupted data")
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119 return count
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120
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121 def __delitem__(self, i):
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122 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None:
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123 raise ValueError("deleting slices only supports a:-1 with step 1")
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124 i = i.start
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125 self._check_index(i)
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126 if i < self._lgt:
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127 self._offsets = self._offsets[:i]
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128 self._lgt = i
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129 self._extra = []
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130 else:
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131 self._extra = self._extra[: i - self._lgt]
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132
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133 def _calculate_index(self, i):
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134 return self._offsets[i]
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135
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136
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137 def parse_index2(data, inline):
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138 if not inline:
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139 return IndexObject(data), None
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140 return InlinedIndexObject(data, inline), (0, data)
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141
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142
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143 def parse_dirstate(dmap, copymap, st):
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144 parents = [st[:20], st[20:40]]
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145 # dereference fields so they will be local in loop
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146 format = ">cllll"
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147 e_size = struct.calcsize(format)
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148 pos1 = 40
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149 l = len(st)
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150
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151 # the inner loop
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152 while pos1 < l:
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153 pos2 = pos1 + e_size
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154 e = _unpack(">cllll", st[pos1:pos2]) # a literal here is faster
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155 pos1 = pos2 + e[4]
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156 f = st[pos2:pos1]
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157 if '\0' in f:
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158 f, c = f.split('\0')
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159 copymap[f] = c
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160 dmap[f] = e[:4]
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161 return parents
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162
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163
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164 def pack_dirstate(dmap, copymap, pl, now):
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165 now = int(now)
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166 cs = stringio()
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167 write = cs.write
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168 write("".join(pl))
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169 for f, e in dmap.iteritems():
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170 if e[0] == 'n' and e[3] == now:
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171 # The file was last modified "simultaneously" with the current
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172 # write to dirstate (i.e. within the same second for file-
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173 # systems with a granularity of 1 sec). This commonly happens
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174 # for at least a couple of files on 'update'.
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175 # The user could change the file without changing its size
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176 # within the same second. Invalidate the file's mtime in
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177 # dirstate, forcing future 'status' calls to compare the
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178 # contents of the file if the size is the same. This prevents
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179 # mistakenly treating such files as clean.
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180 e = dirstatetuple(e[0], e[1], e[2], -1)
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181 dmap[f] = e
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182
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183 if f in copymap:
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184 f = "%s\0%s" % (f, copymap[f])
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185 e = _pack(">cllll", e[0], e[1], e[2], e[3], len(f))
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186 write(e)
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187 write(f)
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188 return cs.getvalue()