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annotate mercurial/node.py @ 46780:6266d19556ad

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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
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1 # node.py - basic nodeid manipulation for mercurial
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2 #
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3 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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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 binascii
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11
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12 # This ugly style has a noticeable effect in manifest parsing
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13 hex = binascii.hexlify
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14 # Adapt to Python 3 API changes. If this ends up showing up in
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15 # profiles, we can use this version only on Python 3, and forward
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16 # binascii.unhexlify like we used to on Python 2.
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17 def bin(s):
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18 try:
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19 return binascii.unhexlify(s)
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20 except binascii.Error as e:
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21 raise TypeError(e)
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22
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24 def short(node):
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25 return hex(node[:6])
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27
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28 nullrev = -1
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29
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30 # pseudo identifier for working directory
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31 # (experimental, so don't add too many dependencies on it)
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32 wdirrev = 0x7FFFFFFF
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33
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35 class sha1nodeconstants(object):
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36 nodelen = 20
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37
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38 # In hex, this is '0000000000000000000000000000000000000000'
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39 nullid = b"\0" * nodelen
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40 nullhex = hex(nullid)
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41
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42 # Phony node value to stand-in for new files in some uses of
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43 # manifests.
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44 # In hex, this is '2121212121212121212121212121212121212121'
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45 newnodeid = b'!!!!!!!!!!!!!!!!!!!!'
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46 # In hex, this is '3030303030303030303030303030306164646564'
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47 addednodeid = b'000000000000000added'
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48 # In hex, this is '3030303030303030303030306d6f646966696564'
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49 modifiednodeid = b'000000000000modified'
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50
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51 wdirfilenodeids = {newnodeid, addednodeid, modifiednodeid}
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52
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53 # pseudo identifier for working directory
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54 # (experimental, so don't add too many dependencies on it)
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55 # In hex, this is 'ffffffffffffffffffffffffffffffffffffffff'
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56 wdirid = b"\xff" * nodelen
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57 wdirhex = hex(wdirid)
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59
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60 # legacy starting point for porting modules
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61 nullid = sha1nodeconstants.nullid
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62 nullhex = sha1nodeconstants.nullhex
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63 newnodeid = sha1nodeconstants.newnodeid
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64 addednodeid = sha1nodeconstants.addednodeid
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65 modifiednodeid = sha1nodeconstants.modifiednodeid
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66 wdirfilenodeids = sha1nodeconstants.wdirfilenodeids
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67 wdirid = sha1nodeconstants.wdirid
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68 wdirhex = sha1nodeconstants.wdirhex