tests/test-parseindex2.py
author Pierre-Yves David <pierre-yves.david@octobus.net>
Fri, 02 Jul 2021 22:48:35 +0200
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child 48499 52034c42c09d
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run-tests: unroll a non-so-one-liner This is shorter and clearer. Differential Revision: https://phab.mercurial-scm.org/D10938
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"""This unit test primarily tests parsers.parse_index2().
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It also checks certain aspects of the parsers module as a whole.
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"""
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from __future__ import absolute_import, print_function
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import os
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import struct
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import subprocess
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import sys
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import unittest
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from mercurial.node import (
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    bin,
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    hex,
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    nullrev,
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    sha1nodeconstants,
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)
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from mercurial import (
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    policy,
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    pycompat,
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)
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from mercurial.revlogutils import (
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    constants,
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)
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parsers = policy.importmod('parsers')
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# original python implementation
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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 int(int(offset) << 16 | type)
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indexformatng = ">Qiiiiii20s12x"
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def py_parseindex(data, inline):
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    s = 64
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    cache = None
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    index = []
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    nodemap = {sha1nodeconstants.nullid: nullrev}
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    n = off = 0
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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 = struct.unpack(indexformatng, data[off : off + s])
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            e = e + (
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                0,
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                0,
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                constants.COMP_MODE_INLINE,
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                constants.COMP_MODE_INLINE,
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            )
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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 = struct.unpack(indexformatng, data[off : off + s])
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            e = e + (
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                0,
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                0,
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                constants.COMP_MODE_INLINE,
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                constants.COMP_MODE_INLINE,
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            )
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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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    return index, cache
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data_inlined = (
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    b'\x00\x01\x00\x01\x00\x00\x00\x00\x00\x00\x01\x8c'
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    b'\x00\x00\x04\x07\x00\x00\x00\x00\x00\x00\x15\x15\xff\xff\xff'
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    b'\xff\xff\xff\xff\xff\xebG\x97\xb7\x1fB\x04\xcf\x13V\x81\tw\x1b'
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    b'w\xdduR\xda\xc6\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
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    b'x\x9c\x9d\x93?O\xc30\x10\xc5\xf7|\x8a\xdb\x9a\xa8m\x06\xd8*\x95'
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    b'\x81B\xa1\xa2\xa2R\xcb\x86Pd\x9a\x0b5$vd_\x04\xfd\xf6\x9c\xff@'
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    b'\x11!\x0b\xd9\xec\xf7\xbbw\xe7gG6\xad6\x04\xdaN\xc0\x92\xa0$)'
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    b'\xb1\x82\xa2\xd1%\x16\xa4\x8b7\xa9\xca\xd4-\xb2Y\x02\xfc\xc9'
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    b'\xcaS\xf9\xaeX\xed\xb6\xd77Q\x02\x83\xd4\x19\xf5--Y\xea\xe1W'
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    b'\xab\xed\x10\xceR\x0f_\xdf\xdf\r\xe1,\xf5\xf0\xcb\xf5 \xceR\x0f'
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    b'_\xdc\x0e\x0e\xc3R\x0f_\xae\x96\x9b!\x9e\xa5\x1e\xbf\xdb,\x06'
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    b'\xc7q\x9a/\x88\x82\xc3B\xea\xb5\xb4TJ\x93\xb6\x82\x0e\xe16\xe6'
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    b'KQ\xdb\xaf\xecG\xa3\xd1 \x01\xd3\x0b_^\xe8\xaa\xa0\xae\xad\xd1'
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    b'&\xbef\x1bz\x08\xb0|\xc9Xz\x06\xf6Z\x91\x90J\xaa\x17\x90\xaa'
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    b'\xd2\xa6\x11$5C\xcf\xba#\xa0\x03\x02*2\x92-\xfc\xb1\x94\xdf\xe2'
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    b'\xae\xb8\'m\x8ey0^\x85\xd3\x82\xb4\xf0`:\x9c\x00\x8a\xfd\x01'
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    b'\xb0\xc6\x86\x8b\xdd\xae\x80\xf3\xa9\x9fd\x16\n\x00R%\x1a\x06'
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    b'\xe9\xd8b\x98\x1d\xf4\xf3+\x9bf\x01\xd8p\x1b\xf3.\xed\x9f^g\xc3'
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    b'^\xd9W81T\xdb\xd5\x04sx|\xf2\xeb\xd6`%?x\xed"\x831\xbf\xf3\xdc'
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    b'b\xeb%gaY\xe1\xad\x9f\xb9f\'1w\xa9\xa5a\x83s\x82J\xb98\xbc4\x8b'
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    b'\x83\x00\x9f$z\xb8#\xa5\xb1\xdf\x98\xd9\xec\x1b\x89O\xe3Ts\x9a4'
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    b'\x17m\x8b\xfc\x8f\xa5\x95\x9a\xfc\xfa\xed,\xe5|\xa1\xfe\x15\xb9'
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    b'\xbc\xb2\x93\x1f\xf2\x95\xff\xdf,\x1a\xc5\xe7\x17*\x93Oz:>\x0e'
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)
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data_non_inlined = (
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    b'\x00\x00\x00\x01\x00\x00\x00\x00\x00\x01D\x19'
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    b'\x00\x07e\x12\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff'
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    b'\xff\xff\xff\xff\xd1\xf4\xbb\xb0\xbe\xfc\x13\xbd\x8c\xd3\x9d'
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    b'\x0f\xcd\xd9;\x8c\x07\x8cJ/\x00\x00\x00\x00\x00\x00\x00\x00\x00'
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    b'\x00\x00\x00\x00\x00\x00\x01D\x19\x00\x00\x00\x00\x00\xdf\x00'
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    b'\x00\x01q\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\xff'
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    b'\xff\xff\xff\xc1\x12\xb9\x04\x96\xa4Z1t\x91\xdfsJ\x90\xf0\x9bh'
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    b'\x07l&\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
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    b'\x00\x01D\xf8\x00\x00\x00\x00\x01\x1b\x00\x00\x01\xb8\x00\x00'
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    b'\x00\x01\x00\x00\x00\x02\x00\x00\x00\x01\xff\xff\xff\xff\x02\n'
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    b'\x0e\xc6&\xa1\x92\xae6\x0b\x02i\xfe-\xe5\xbao\x05\xd1\xe7\x00'
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    b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01F'
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    b'\x13\x00\x00\x00\x00\x01\xec\x00\x00\x03\x06\x00\x00\x00\x01'
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    b'\x00\x00\x00\x03\x00\x00\x00\x02\xff\xff\xff\xff\x12\xcb\xeby1'
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    b'\xb6\r\x98B\xcb\x07\xbd`\x8f\x92\xd9\xc4\x84\xbdK\x00\x00\x00'
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    b'\x00\x00\x00\x00\x00\x00\x00\x00\x00'
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)
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def parse_index2(data, inline, revlogv2=False):
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    index, chunkcache = parsers.parse_index2(data, inline, revlogv2=revlogv2)
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    return list(index), chunkcache
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def importparsers(hexversion):
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    """Import mercurial.parsers with the given sys.hexversion."""
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    # The file parsers.c inspects sys.hexversion to determine the version
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    # of the currently-running Python interpreter, so we monkey-patch
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    # sys.hexversion to simulate using different versions.
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    code = (
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        "import sys; sys.hexversion=%s; "
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        "import mercurial.cext.parsers" % hexversion
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    )
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    cmd = "\"%s\" -c \"%s\"" % (os.environ['PYTHON'], code)
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    # We need to do these tests inside a subprocess because parser.c's
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    # version-checking code happens inside the module init function, and
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    # when using reload() to reimport an extension module, "The init function
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    # of extension modules is not called a second time"
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    # (from http://docs.python.org/2/library/functions.html?#reload).
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    p = subprocess.Popen(
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        cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT
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    )
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    return p.communicate()  # returns stdout, stderr
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def hexfailmsg(testnumber, hexversion, stdout, expected):
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    try:
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        hexstring = hex(hexversion)
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    except TypeError:
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        hexstring = None
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    return (
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        "FAILED: version test #%s with Python %s and patched "
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        "sys.hexversion %r (%r):\n Expected %s but got:\n-->'%s'\n"
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        % (
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            testnumber,
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            sys.version_info,
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            hexversion,
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            hexstring,
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            expected,
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            stdout,
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        )
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    )
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def makehex(major, minor, micro):
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    return int("%x%02x%02x00" % (major, minor, micro), 16)
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class parseindex2tests(unittest.TestCase):
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    def assertversionokay(self, testnumber, hexversion):
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        stdout, stderr = importparsers(hexversion)
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        self.assertFalse(
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            stdout, hexfailmsg(testnumber, hexversion, stdout, 'no stdout')
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        )
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    def assertversionfail(self, testnumber, hexversion):
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        stdout, stderr = importparsers(hexversion)
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        # We include versionerrortext to distinguish from other ImportErrors.
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        errtext = b"ImportError: %s" % pycompat.sysbytes(
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            parsers.versionerrortext
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        )
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        self.assertIn(
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            errtext,
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            stdout,
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            hexfailmsg(
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                testnumber,
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                hexversion,
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                stdout,
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                expected="stdout to contain %r" % errtext,
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            ),
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        )
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    def testversiondetection(self):
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        """Check the version-detection logic when importing parsers."""
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        # Only test the version-detection logic if it is present.
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        try:
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            parsers.versionerrortext
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        except AttributeError:
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            return
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        info = sys.version_info
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        major, minor, micro = info[0], info[1], info[2]
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        # Test same major-minor versions.
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        self.assertversionokay(1, makehex(major, minor, micro))
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        self.assertversionokay(2, makehex(major, minor, micro + 1))
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        # Test different major-minor versions.
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        self.assertversionfail(3, makehex(major + 1, minor, micro))
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        self.assertversionfail(4, makehex(major, minor + 1, micro))
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        self.assertversionfail(5, "'foo'")
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    def testbadargs(self):
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        # Check that parse_index2() raises TypeError on bad arguments.
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        with self.assertRaises(TypeError):
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            parse_index2(0, True)
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    def testparseindexfile(self):
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        # Check parsers.parse_index2() on an index file against the
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        # original Python implementation of parseindex, both with and
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        # without inlined data.
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        want = py_parseindex(data_inlined, True)
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        got = parse_index2(data_inlined, True)
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        self.assertEqual(want, got)  # inline data
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        want = py_parseindex(data_non_inlined, False)
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        got = parse_index2(data_non_inlined, False)
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        self.assertEqual(want, got)  # no inline data
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        ix = parsers.parse_index2(data_inlined, True)[0]
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        for i, r in enumerate(ix):
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            if r[7] == sha1nodeconstants.nullid:
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                i = -1
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            try:
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                self.assertEqual(
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                    ix[r[7]],
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                    i,
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                    'Reverse lookup inconsistent for %r' % hex(r[7]),
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                )
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            except TypeError:
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                # pure version doesn't support this
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   255
                break
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   256
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    def testminusone(self):
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        want = (
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            0,
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            0,
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            0,
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            -1,
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            -1,
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            -1,
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            -1,
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            sha1nodeconstants.nullid,
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            0,
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            0,
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            constants.COMP_MODE_INLINE,
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            constants.COMP_MODE_INLINE,
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        )
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        index, junk = parsers.parse_index2(data_inlined, True)
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        got = index[-1]
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        self.assertEqual(want, got)  # inline data
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        index, junk = parsers.parse_index2(data_non_inlined, False)
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        got = index[-1]
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        self.assertEqual(want, got)  # no inline data
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    def testdelitemwithoutnodetree(self):
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        index, _junk = parsers.parse_index2(data_non_inlined, False)
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        def hexrev(rev):
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            if rev == nullrev:
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                return b'\xff\xff\xff\xff'
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   286
            else:
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                return bin('%08x' % rev)
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   288
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   289
        def appendrev(p1, p2=nullrev):
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   290
            # node won't matter for this test, let's just make sure
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            # they don't collide. Other data don't matter either.
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   292
            node = hexrev(p1) + hexrev(p2) + b'.' * 12
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   293
            e = (
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                0,
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   295
                0,
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   296
                12,
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   297
                1,
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   298
                34,
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   299
                p1,
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   300
                p2,
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   301
                node,
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   302
                0,
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   303
                0,
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   304
                constants.COMP_MODE_INLINE,
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   305
                constants.COMP_MODE_INLINE,
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   306
            )
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   307
            index.append(e)
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   308
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   309
        appendrev(4)
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   310
        appendrev(5)
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   311
        appendrev(6)
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   312
        self.assertEqual(len(index), 7)
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   313
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   314
        del index[1:-1]
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   315
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   316
        # assertions that failed before correction
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   317
        self.assertEqual(len(index), 1)  # was 4
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   318
        headrevs = getattr(index, 'headrevs', None)
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   319
        if headrevs is not None:  # not implemented in pure
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   320
            self.assertEqual(index.headrevs(), [0])  # gave ValueError
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diff changeset
   321
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diff changeset
   322
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diff changeset
   323
if __name__ == '__main__':
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   324
    import silenttestrunner
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   325
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   326
    silenttestrunner.main(__name__)