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comparison mercurial/node.py @ 46793:6266d19556ad

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node: introduce nodeconstants class In preparing for moving from SHA1 hashes to a modern hash function, place nullid and other constant magic vules in a class. Provide the active set of constants in the repository and push it down. Provide nullid directly in strategic places like the repository as it is accessed very often. This changeset introduces the API change, but not the mechanical replacement of the node.py attributes itself. Differential Revision: https://phab.mercurial-scm.org/D9750
author Joerg Sonnenberger <joerg@bec.de>
date Wed, 13 Jan 2021 16:14:58 +0100
parents 687b865b95ad
children d4ba4d51f85f
comparison
equal deleted inserted replaced
46792:49fd21f32695 46793:6266d19556ad
19 return binascii.unhexlify(s) 19 return binascii.unhexlify(s)
20 except binascii.Error as e: 20 except binascii.Error as e:
21 raise TypeError(e) 21 raise TypeError(e)
22 22
23 23
24 nullrev = -1 24 def short(node):
25 # In hex, this is '0000000000000000000000000000000000000000' 25 return hex(node[:6])
26 nullid = b"\0" * 20
27 nullhex = hex(nullid)
28
29 # Phony node value to stand-in for new files in some uses of
30 # manifests.
31 # In hex, this is '2121212121212121212121212121212121212121'
32 newnodeid = b'!!!!!!!!!!!!!!!!!!!!'
33 # In hex, this is '3030303030303030303030303030306164646564'
34 addednodeid = b'000000000000000added'
35 # In hex, this is '3030303030303030303030306d6f646966696564'
36 modifiednodeid = b'000000000000modified'
37
38 wdirfilenodeids = {newnodeid, addednodeid, modifiednodeid}
39
40 # pseudo identifiers for working directory
41 # (they are experimental, so don't add too many dependencies on them)
42 wdirrev = 0x7FFFFFFF
43 # In hex, this is 'ffffffffffffffffffffffffffffffffffffffff'
44 wdirid = b"\xff" * 20
45 wdirhex = hex(wdirid)
46 26
47 27
48 def short(node): 28 nullrev = -1
49 return hex(node[:6]) 29
30 # pseudo identifier for working directory
31 # (experimental, so don't add too many dependencies on it)
32 wdirrev = 0x7FFFFFFF
33
34
35 class sha1nodeconstants(object):
36 nodelen = 20
37
38 # In hex, this is '0000000000000000000000000000000000000000'
39 nullid = b"\0" * nodelen
40 nullhex = hex(nullid)
41
42 # Phony node value to stand-in for new files in some uses of
43 # manifests.
44 # In hex, this is '2121212121212121212121212121212121212121'
45 newnodeid = b'!!!!!!!!!!!!!!!!!!!!'
46 # In hex, this is '3030303030303030303030303030306164646564'
47 addednodeid = b'000000000000000added'
48 # In hex, this is '3030303030303030303030306d6f646966696564'
49 modifiednodeid = b'000000000000modified'
50
51 wdirfilenodeids = {newnodeid, addednodeid, modifiednodeid}
52
53 # pseudo identifier for working directory
54 # (experimental, so don't add too many dependencies on it)
55 # In hex, this is 'ffffffffffffffffffffffffffffffffffffffff'
56 wdirid = b"\xff" * nodelen
57 wdirhex = hex(wdirid)
58
59
60 # legacy starting point for porting modules
61 nullid = sha1nodeconstants.nullid
62 nullhex = sha1nodeconstants.nullhex
63 newnodeid = sha1nodeconstants.newnodeid
64 addednodeid = sha1nodeconstants.addednodeid
65 modifiednodeid = sha1nodeconstants.modifiednodeid
66 wdirfilenodeids = sha1nodeconstants.wdirfilenodeids
67 wdirid = sha1nodeconstants.wdirid
68 wdirhex = sha1nodeconstants.wdirhex