annotate mercurial/pure/parsers.py @ 46414:16c18d5e5dc8

merge with stable
author Pulkit Goyal <7895pulkit@gmail.com>
date Fri, 29 Jan 2021 17:32:09 +0530
parents 095fa99ae5f5
children e83327af26f1
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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
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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, nullrev
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14 from .. import (
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15 pycompat,
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16 util,
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17 )
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18
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19 from ..revlogutils import nodemap as nodemaputil
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20
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21 stringio = pycompat.bytesio
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22
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23
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24 _pack = struct.pack
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25 _unpack = struct.unpack
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26 _compress = zlib.compress
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27 _decompress = zlib.decompress
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28
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29 # Some code below makes tuples directly because it's more convenient. However,
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30 # code outside this module should always use dirstatetuple.
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31 def dirstatetuple(*x):
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32 # x is a tuple
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33 return x
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34
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35
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36 def gettype(q):
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37 return int(q & 0xFFFF)
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39
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40 def offset_type(offset, type):
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41 return int(int(offset) << 16 | type)
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43
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44 class BaseIndexObject(object):
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45 index_format = b">Qiiiiii20s12x"
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46 big_int_size = struct.calcsize(b'Q')
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47 int_size = struct.calcsize(b'i')
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48 index_size = struct.calcsize(index_format)
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49 null_item = (0, 0, 0, -1, -1, -1, -1, nullid)
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50
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51 @property
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52 def nodemap(self):
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53 msg = b"index.nodemap is deprecated, use index.[has_node|rev|get_rev]"
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54 util.nouideprecwarn(msg, b'5.3', stacklevel=2)
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55 return self._nodemap
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56
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57 @util.propertycache
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58 def _nodemap(self):
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59 nodemap = nodemaputil.NodeMap({nullid: nullrev})
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60 for r in range(0, len(self)):
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61 n = self[r][7]
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62 nodemap[n] = r
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63 return nodemap
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64
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65 def has_node(self, node):
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66 """return True if the node exist in the index"""
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67 return node in self._nodemap
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68
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69 def rev(self, node):
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70 """return a revision for a node
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71
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72 If the node is unknown, raise a RevlogError"""
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73 return self._nodemap[node]
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74
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75 def get_rev(self, node):
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76 """return a revision for a node
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77
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78 If the node is unknown, return None"""
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79 return self._nodemap.get(node)
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80
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81 def _stripnodes(self, start):
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82 if '_nodemap' in vars(self):
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83 for r in range(start, len(self)):
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84 n = self[r][7]
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85 del self._nodemap[n]
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86
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87 def clearcaches(self):
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88 self.__dict__.pop('_nodemap', None)
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89
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90 def __len__(self):
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91 return self._lgt + len(self._extra)
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92
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93 def append(self, tup):
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94 if '_nodemap' in vars(self):
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95 self._nodemap[tup[7]] = len(self)
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96 data = _pack(self.index_format, *tup)
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97 self._extra.append(data)
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98
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99 def _check_index(self, i):
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100 if not isinstance(i, int):
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101 raise TypeError(b"expecting int indexes")
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102 if i < 0 or i >= len(self):
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103 raise IndexError
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104
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105 def __getitem__(self, i):
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106 if i == -1:
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107 return self.null_item
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108 self._check_index(i)
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109 if i >= self._lgt:
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110 data = self._extra[i - self._lgt]
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111 else:
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112 index = self._calculate_index(i)
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113 data = self._data[index : index + self.index_size]
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114 r = _unpack(self.index_format, data)
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115 if self._lgt and i == 0:
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116 r = (offset_type(0, gettype(r[0])),) + r[1:]
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117 return r
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118
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119
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120 class IndexObject(BaseIndexObject):
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121 def __init__(self, data):
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122 assert len(data) % self.index_size == 0
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123 self._data = data
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124 self._lgt = len(data) // self.index_size
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125 self._extra = []
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126
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127 def _calculate_index(self, i):
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128 return i * self.index_size
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129
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130 def __delitem__(self, i):
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131 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None:
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132 raise ValueError(b"deleting slices only supports a:-1 with step 1")
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133 i = i.start
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134 self._check_index(i)
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135 self._stripnodes(i)
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136 if i < self._lgt:
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137 self._data = self._data[: i * self.index_size]
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138 self._lgt = i
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139 self._extra = []
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140 else:
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141 self._extra = self._extra[: i - self._lgt]
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142
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143
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144 class PersistentNodeMapIndexObject(IndexObject):
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145 """a Debug oriented class to test persistent nodemap
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146
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147 We need a simple python object to test API and higher level behavior. See
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148 the Rust implementation for more serious usage. This should be used only
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149 through the dedicated `devel.persistent-nodemap` config.
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150 """
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151
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152 def nodemap_data_all(self):
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153 """Return bytes containing a full serialization of a nodemap
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154
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155 The nodemap should be valid for the full set of revisions in the
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156 index."""
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157 return nodemaputil.persistent_data(self)
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158
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159 def nodemap_data_incremental(self):
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160 """Return bytes containing a incremental update to persistent nodemap
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161
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162 This containst the data for an append-only update of the data provided
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163 in the last call to `update_nodemap_data`.
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164 """
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165 if self._nm_root is None:
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166 return None
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167 docket = self._nm_docket
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168 changed, data = nodemaputil.update_persistent_data(
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169 self, self._nm_root, self._nm_max_idx, self._nm_docket.tip_rev
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170 )
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171
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172 self._nm_root = self._nm_max_idx = self._nm_docket = None
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173 return docket, changed, data
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174
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175 def update_nodemap_data(self, docket, nm_data):
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176 """provide full block of persisted binary data for a nodemap
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177
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178 The data are expected to come from disk. See `nodemap_data_all` for a
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179 produceur of such data."""
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180 if nm_data is not None:
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181 self._nm_root, self._nm_max_idx = nodemaputil.parse_data(nm_data)
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182 if self._nm_root:
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183 self._nm_docket = docket
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184 else:
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185 self._nm_root = self._nm_max_idx = self._nm_docket = None
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186
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187
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188 class InlinedIndexObject(BaseIndexObject):
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189 def __init__(self, data, inline=0):
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190 self._data = data
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191 self._lgt = self._inline_scan(None)
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192 self._inline_scan(self._lgt)
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193 self._extra = []
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194
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195 def _inline_scan(self, lgt):
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196 off = 0
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197 if lgt is not None:
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198 self._offsets = [0] * lgt
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199 count = 0
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200 while off <= len(self._data) - self.index_size:
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201 start = off + self.big_int_size
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202 (s,) = struct.unpack(
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203 b'>i',
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204 self._data[start : start + self.int_size],
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205 )
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206 if lgt is not None:
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207 self._offsets[count] = off
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208 count += 1
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209 off += self.index_size + s
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210 if off != len(self._data):
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211 raise ValueError(b"corrupted data")
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212 return count
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213
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214 def __delitem__(self, i):
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215 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None:
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216 raise ValueError(b"deleting slices only supports a:-1 with step 1")
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217 i = i.start
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218 self._check_index(i)
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219 self._stripnodes(i)
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220 if i < self._lgt:
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221 self._offsets = self._offsets[:i]
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222 self._lgt = i
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223 self._extra = []
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224 else:
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225 self._extra = self._extra[: i - self._lgt]
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226
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227 def _calculate_index(self, i):
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228 return self._offsets[i]
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229
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230
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231 def parse_index2(data, inline):
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232 if not inline:
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233 return IndexObject(data), None
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234 return InlinedIndexObject(data, inline), (0, data)
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235
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236
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237 def parse_index_devel_nodemap(data, inline):
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238 """like parse_index2, but alway return a PersistentNodeMapIndexObject"""
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239 return PersistentNodeMapIndexObject(data), None
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240
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241
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242 def parse_dirstate(dmap, copymap, st):
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243 parents = [st[:20], st[20:40]]
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244 # dereference fields so they will be local in loop
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245 format = b">cllll"
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246 e_size = struct.calcsize(format)
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247 pos1 = 40
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248 l = len(st)
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249
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250 # the inner loop
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251 while pos1 < l:
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252 pos2 = pos1 + e_size
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253 e = _unpack(b">cllll", st[pos1:pos2]) # a literal here is faster
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254 pos1 = pos2 + e[4]
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255 f = st[pos2:pos1]
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256 if b'\0' in f:
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257 f, c = f.split(b'\0')
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258 copymap[f] = c
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259 dmap[f] = e[:4]
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260 return parents
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261
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262
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263 def pack_dirstate(dmap, copymap, pl, now):
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264 now = int(now)
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265 cs = stringio()
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266 write = cs.write
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267 write(b"".join(pl))
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268 for f, e in pycompat.iteritems(dmap):
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269 if e[0] == b'n' and e[3] == now:
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270 # The file was last modified "simultaneously" with the current
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271 # write to dirstate (i.e. within the same second for file-
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272 # systems with a granularity of 1 sec). This commonly happens
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273 # for at least a couple of files on 'update'.
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274 # The user could change the file without changing its size
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275 # within the same second. Invalidate the file's mtime in
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276 # dirstate, forcing future 'status' calls to compare the
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277 # contents of the file if the size is the same. This prevents
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278 # mistakenly treating such files as clean.
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279 e = dirstatetuple(e[0], e[1], e[2], -1)
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280 dmap[f] = e
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281
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282 if f in copymap:
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283 f = b"%s\0%s" % (f, copymap[f])
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284 e = _pack(b">cllll", e[0], e[1], e[2], e[3], len(f))
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285 write(e)
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286 write(f)
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287 return cs.getvalue()