# node.py - basic nodeid manipulation for mercurial

#

# Copyright 2005, 2006 Olivia Mackall <olivia@selenic.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import binascii

# This ugly style has a noticeable effect in manifest parsing

hex = binascii.hexlify

# Adapt to Python 3 API changes. If this ends up showing up in

# profiles, we can use this version only on Python 3, and forward

# binascii.unhexlify like we used to on Python 2.

def bin(s):

    try:

        return binascii.unhexlify(s)

    except binascii.Error as e:

        raise TypeError(e)

def short(node):

    return hex(node[:6])

nullrev = -1

# pseudo identifier for working directory

# (experimental, so don't add too many dependencies on it)

wdirrev = 0x7FFFFFFF

class sha1nodeconstants(object):

    nodelen = 20

    # In hex, this is '0000000000000000000000000000000000000000'

    nullid = b"\0" * nodelen

    nullhex = hex(nullid)

    # Phony node value to stand-in for new files in some uses of

    # manifests.

    # In hex, this is '2121212121212121212121212121212121212121'

    newnodeid = b'!!!!!!!!!!!!!!!!!!!!'

    # In hex, this is '3030303030303030303030303030306164646564'

    addednodeid = b'000000000000000added'

    # In hex, this is '3030303030303030303030306d6f646966696564'

    modifiednodeid = b'000000000000modified'

    wdirfilenodeids = {newnodeid, addednodeid, modifiednodeid}

    # pseudo identifier for working directory

    # (experimental, so don't add too many dependencies on it)

    # In hex, this is 'ffffffffffffffffffffffffffffffffffffffff'

    wdirid = b"\xff" * nodelen

    wdirhex = hex(wdirid)

# legacy starting point for porting modules

nullid = sha1nodeconstants.nullid

nullhex = sha1nodeconstants.nullhex

newnodeid = sha1nodeconstants.newnodeid

addednodeid = sha1nodeconstants.addednodeid

modifiednodeid = sha1nodeconstants.modifiednodeid

wdirfilenodeids = sha1nodeconstants.wdirfilenodeids

wdirid = sha1nodeconstants.wdirid

wdirhex = sha1nodeconstants.wdirhex