author | Yuya Nishihara <yuya@tcha.org> |
Sat, 15 Sep 2018 12:34:13 +0900 | |
changeset 39752 | 2d478b05fb14 |
parent 39217 | 5961517fd2a8 |
child 43076 | 2372284d9457 |
permissions | -rw-r--r-- |
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# parsers.py - Python implementation of parsers.c |
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# |
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# Copyright 2009 Matt Mackall <mpm@selenic.com> and others |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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from __future__ import absolute_import |
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import struct |
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import zlib |
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from ..node import nullid |
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from .. import pycompat |
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stringio = pycompat.bytesio |
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_pack = struct.pack |
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_unpack = struct.unpack |
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_compress = zlib.compress |
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_decompress = zlib.decompress |
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# Some code below makes tuples directly because it's more convenient. However, |
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# code outside this module should always use dirstatetuple. |
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def dirstatetuple(*x): |
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# x is a tuple |
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return x |
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indexformatng = ">Qiiiiii20s12x" |
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indexfirst = struct.calcsize('Q') |
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sizeint = struct.calcsize('i') |
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indexsize = struct.calcsize(indexformatng) |
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def gettype(q): |
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return int(q & 0xFFFF) |
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def offset_type(offset, type): |
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return int(int(offset) << 16 | type) |
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class BaseIndexObject(object): |
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def __len__(self): |
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return self._lgt + len(self._extra) |
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def append(self, tup): |
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self._extra.append(tup) |
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def _check_index(self, i): |
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if not isinstance(i, int): |
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raise TypeError("expecting int indexes") |
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if i < 0 or i >= len(self): |
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raise IndexError |
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def __getitem__(self, i): |
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if i == -1: |
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return (0, 0, 0, -1, -1, -1, -1, nullid) |
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self._check_index(i) |
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if i >= self._lgt: |
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return self._extra[i - self._lgt] |
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index = self._calculate_index(i) |
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r = struct.unpack(indexformatng, self._data[index:index + indexsize]) |
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if i == 0: |
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e = list(r) |
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type = gettype(e[0]) |
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e[0] = offset_type(0, type) |
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return tuple(e) |
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return r |
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class IndexObject(BaseIndexObject): |
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def __init__(self, data): |
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assert len(data) % indexsize == 0 |
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self._data = data |
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self._lgt = len(data) // indexsize |
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self._extra = [] |
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def _calculate_index(self, i): |
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return i * indexsize |
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def __delitem__(self, i): |
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if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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raise ValueError("deleting slices only supports a:-1 with step 1") |
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i = i.start |
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self._check_index(i) |
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if i < self._lgt: |
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self._data = self._data[:i * indexsize] |
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self._lgt = i |
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self._extra = [] |
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else: |
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self._extra = self._extra[:i - self._lgt] |
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class InlinedIndexObject(BaseIndexObject): |
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def __init__(self, data, inline=0): |
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self._data = data |
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self._lgt = self._inline_scan(None) |
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self._inline_scan(self._lgt) |
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self._extra = [] |
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def _inline_scan(self, lgt): |
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off = 0 |
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if lgt is not None: |
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self._offsets = [0] * lgt |
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count = 0 |
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while off <= len(self._data) - indexsize: |
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s, = struct.unpack('>i', |
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self._data[off + indexfirst:off + sizeint + indexfirst]) |
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if lgt is not None: |
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self._offsets[count] = off |
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count += 1 |
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off += indexsize + s |
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if off != len(self._data): |
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raise ValueError("corrupted data") |
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return count |
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def __delitem__(self, i): |
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if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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raise ValueError("deleting slices only supports a:-1 with step 1") |
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i = i.start |
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self._check_index(i) |
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if i < self._lgt: |
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self._offsets = self._offsets[:i] |
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self._lgt = i |
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121 |
self._extra = [] |
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122 |
else: |
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123 |
self._extra = self._extra[:i - self._lgt] |
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124 |
|
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125 |
def _calculate_index(self, i): |
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return self._offsets[i] |
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127 |
|
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128 |
def parse_index2(data, inline): |
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129 |
if not inline: |
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130 |
return IndexObject(data), None |
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return InlinedIndexObject(data, inline), (0, data) |
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132 |
|
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133 |
def parse_dirstate(dmap, copymap, st): |
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134 |
parents = [st[:20], st[20: 40]] |
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fix wording and not-completely-trivial spelling errors and bad docstrings
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135 |
# dereference fields so they will be local in loop |
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136 |
format = ">cllll" |
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137 |
e_size = struct.calcsize(format) |
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138 |
pos1 = 40 |
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139 |
l = len(st) |
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140 |
|
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141 |
# the inner loop |
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142 |
while pos1 < l: |
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143 |
pos2 = pos1 + e_size |
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144 |
e = _unpack(">cllll", st[pos1:pos2]) # a literal here is faster |
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145 |
pos1 = pos2 + e[4] |
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146 |
f = st[pos2:pos1] |
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147 |
if '\0' in f: |
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148 |
f, c = f.split('\0') |
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149 |
copymap[f] = c |
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150 |
dmap[f] = e[:4] |
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151 |
return parents |
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152 |
|
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153 |
def pack_dirstate(dmap, copymap, pl, now): |
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154 |
now = int(now) |
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155 |
cs = stringio() |
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156 |
write = cs.write |
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157 |
write("".join(pl)) |
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158 |
for f, e in dmap.iteritems(): |
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159 |
if e[0] == 'n' and e[3] == now: |
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160 |
# The file was last modified "simultaneously" with the current |
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161 |
# write to dirstate (i.e. within the same second for file- |
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162 |
# systems with a granularity of 1 sec). This commonly happens |
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163 |
# for at least a couple of files on 'update'. |
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164 |
# The user could change the file without changing its size |
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165 |
# within the same second. Invalidate the file's mtime in |
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166 |
# dirstate, forcing future 'status' calls to compare the |
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167 |
# contents of the file if the size is the same. This prevents |
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168 |
# mistakenly treating such files as clean. |
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169 |
e = dirstatetuple(e[0], e[1], e[2], -1) |
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170 |
dmap[f] = e |
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171 |
|
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172 |
if f in copymap: |
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173 |
f = "%s\0%s" % (f, copymap[f]) |
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174 |
e = _pack(">cllll", e[0], e[1], e[2], e[3], len(f)) |
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175 |
write(e) |
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176 |
write(f) |
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177 |
return cs.getvalue() |