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comparison mercurial/revlog.py @ 39356:729082bb9938

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revlog: split constants into a new `revlogutils.constants` module We want to split some logic out of the main revlog file (the delta computing logic). However, this logic needs access to multiple constants related to the revlog. So we move all revlog related constants into a new module that could be imported from multiple places. We don't copy the file (preserving blame history) because there are only a few moving lines. Also, copying the file would result in annoying merge conflicts with ongoing work from others contributors.
author Boris Feld <boris.feld@octobus.net>
date Thu, 16 Aug 2018 02:08:13 +0200
parents 0a5b20c107a6
children 655b5b465953
comparison
equal deleted inserted replaced
39355:94a4980695f8 39356:729082bb9938
34 wdirhex, 34 wdirhex,
35 wdirid, 35 wdirid,
36 wdirrev, 36 wdirrev,
37 ) 37 )
38 from .i18n import _ 38 from .i18n import _
39 from .revlogutils.constants import (
40 FLAG_GENERALDELTA,
41 FLAG_INLINE_DATA,
42 LIMIT_DELTA2TEXT,
43 REVIDX_DEFAULT_FLAGS,
44 REVIDX_ELLIPSIS,
45 REVIDX_EXTSTORED,
46 REVIDX_FLAGS_ORDER,
47 REVIDX_ISCENSORED,
48 REVIDX_KNOWN_FLAGS,
49 REVIDX_RAWTEXT_CHANGING_FLAGS,
50 REVLOGV0,
51 REVLOGV1,
52 REVLOGV1_FLAGS,
53 REVLOGV2,
54 REVLOGV2_FLAGS,
55 REVLOG_DEFAULT_FLAGS,
56 REVLOG_DEFAULT_FORMAT,
57 REVLOG_DEFAULT_VERSION,
58 )
39 from .thirdparty import ( 59 from .thirdparty import (
40 attr, 60 attr,
41 ) 61 )
42 from . import ( 62 from . import (
43 ancestor, 63 ancestor,
52 from .utils import ( 72 from .utils import (
53 interfaceutil, 73 interfaceutil,
54 stringutil, 74 stringutil,
55 ) 75 )
56 76
77 # blanked usage of all the name to prevent pyflakes constraints
78 # We need these name available in the module for extensions.
79 REVLOGV0
80 REVLOGV1
81 REVLOGV2
82 FLAG_INLINE_DATA
83 FLAG_GENERALDELTA
84 REVLOG_DEFAULT_FLAGS
85 REVLOG_DEFAULT_FORMAT
86 REVLOG_DEFAULT_VERSION
87 REVLOGV1_FLAGS
88 REVLOGV2_FLAGS
89 REVIDX_ISCENSORED
90 REVIDX_ELLIPSIS
91 REVIDX_EXTSTORED
92 REVIDX_DEFAULT_FLAGS
93 REVIDX_FLAGS_ORDER
94 REVIDX_KNOWN_FLAGS
95 REVIDX_RAWTEXT_CHANGING_FLAGS
96
57 parsers = policy.importmod(r'parsers') 97 parsers = policy.importmod(r'parsers')
58 98
59 # Aliased for performance. 99 # Aliased for performance.
60 _zlibdecompress = zlib.decompress 100 _zlibdecompress = zlib.decompress
61
62 # revlog header flags
63 REVLOGV0 = 0
64 REVLOGV1 = 1
65 # Dummy value until file format is finalized.
66 # Reminder: change the bounds check in revlog.__init__ when this is changed.
67 REVLOGV2 = 0xDEAD
68 FLAG_INLINE_DATA = (1 << 16)
69 FLAG_GENERALDELTA = (1 << 17)
70 REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
71 REVLOG_DEFAULT_FORMAT = REVLOGV1
72 REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
73 REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA
74 REVLOGV2_FLAGS = REVLOGV1_FLAGS
75
76 # revlog index flags
77 REVIDX_ISCENSORED = (1 << 15) # revision has censor metadata, must be verified
78 REVIDX_ELLIPSIS = (1 << 14) # revision hash does not match data (narrowhg)
79 REVIDX_EXTSTORED = (1 << 13) # revision data is stored externally
80 REVIDX_DEFAULT_FLAGS = 0
81 # stable order in which flags need to be processed and their processors applied
82 REVIDX_FLAGS_ORDER = [
83 REVIDX_ISCENSORED,
84 REVIDX_ELLIPSIS,
85 REVIDX_EXTSTORED,
86 ]
87 REVIDX_KNOWN_FLAGS = util.bitsfrom(REVIDX_FLAGS_ORDER)
88 # bitmark for flags that could cause rawdata content change
89 REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED
90 101
91 # max size of revlog with inline data 102 # max size of revlog with inline data
92 _maxinline = 131072 103 _maxinline = 131072
93 _chunksize = 1048576 104 _chunksize = 1048576
94 105
851 class revlogoldindex(list): 862 class revlogoldindex(list):
852 def __getitem__(self, i): 863 def __getitem__(self, i):
853 if i == -1: 864 if i == -1:
854 return (0, 0, 0, -1, -1, -1, -1, nullid) 865 return (0, 0, 0, -1, -1, -1, -1, nullid)
855 return list.__getitem__(self, i) 866 return list.__getitem__(self, i)
856
857 # maximum <delta-chain-data>/<revision-text-length> ratio
858 LIMIT_DELTA2TEXT = 2
859 867
860 class revlogoldio(object): 868 class revlogoldio(object):
861 def __init__(self): 869 def __init__(self):
862 self.size = indexformatv0.size 870 self.size = indexformatv0.size
863 871