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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 mercurial.node import bin, nullid, nullrev
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from mercurial import util
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import struct, zlib
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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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_sha = util.sha1
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def parse_manifest(mfdict, fdict, lines):
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for l in lines.splitlines():
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f, n = l.split('\0')
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if len(n) > 40:
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fdict[f] = n[40:]
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mfdict[f] = bin(n[:40])
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else:
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mfdict[f] = bin(n)
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def parse_index(data, inline):
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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 long(long(offset) << 16 | type)
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indexformatng = ">Qiiiiii20s12x"
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s = struct.calcsize(indexformatng)
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index = []
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cache = None
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nodemap = {nullid: nullrev}
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n = off = 0
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# if we're not using lazymap, always read the whole index
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l = len(data) - s
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append = index.append
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if inline:
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cache = (0, data)
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while off <= l:
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e = _unpack(indexformatng, data[off:off + s])
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nodemap[e[7]] = n
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append(e)
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n += 1
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if e[1] < 0:
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break
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off += e[1] + s
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else:
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while off <= l:
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e = _unpack(indexformatng, data[off:off + s])
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nodemap[e[7]] = n
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append(e)
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n += 1
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off += s
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e = list(index[0])
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type = gettype(e[0])
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e[0] = offset_type(0, type)
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index[0] = tuple(e)
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# add the magic null revision at -1
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index.append((0, 0, 0, -1, -1, -1, -1, nullid))
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return index, nodemap, cache
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def parse_dirstate(dmap, copymap, st):
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parents = [st[:20], st[20: 40]]
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# deref fields so they will be local in loop
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format = ">cllll"
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e_size = struct.calcsize(format)
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pos1 = 40
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l = len(st)
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# the inner loop
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while pos1 < l:
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pos2 = pos1 + e_size
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e = _unpack(">cllll", st[pos1:pos2]) # a literal here is faster
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pos1 = pos2 + e[4]
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f = st[pos2:pos1]
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if '\0' in f:
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f, c = f.split('\0')
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copymap[f] = c
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dmap[f] = e[:4]
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return parents
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