tests: move stdlib imports before mercurial modules in test-parseindex2

tests/test-parseindex2.py

@@ -1,210 +1,212
 """This unit test primarily tests parsers.parse_index2().
 
 It also checks certain aspects of the parsers module as a whole.
 """
 
 from __future__ import absolute_import, print_function
+
+import struct
+import subprocess
+import sys
+
 from mercurial import (
     parsers,
 )
 from mercurial.node import (
     nullid,
     nullrev,
 )
-import struct
-import subprocess
-import sys
 
 # original python implementation
 def gettype(q):
     return int(q & 0xFFFF)
 
 def offset_type(offset, type):
     return long(long(offset) << 16 | type)
 
 indexformatng = ">Qiiiiii20s12x"
 
 def py_parseindex(data, inline) :
     s = 64
     cache = None
     index = []
     nodemap = {nullid: nullrev}
     n = off = 0
 
     l = len(data) - s
     append = index.append
     if inline:
         cache = (0, data)
         while off <= l:
             e = struct.unpack(indexformatng, data[off:off + s])
             nodemap[e[7]] = n
             append(e)
             n += 1
             if e[1] < 0:
                 break
             off += e[1] + s
     else:
         while off <= l:
             e = struct.unpack(indexformatng, data[off:off + s])
             nodemap[e[7]] = n
             append(e)
             n += 1
             off += s
 
     e = list(index[0])
     type = gettype(e[0])
     e[0] = offset_type(0, type)
     index[0] = tuple(e)
 
     # add the magic null revision at -1
     index.append((0, 0, 0, -1, -1, -1, -1, nullid))
 
     return index, cache
 
 data_inlined = '\x00\x01\x00\x01\x00\x00\x00\x00\x00\x00\x01\x8c' \
     '\x00\x00\x04\x07\x00\x00\x00\x00\x00\x00\x15\x15\xff\xff\xff' \
     '\xff\xff\xff\xff\xff\xebG\x97\xb7\x1fB\x04\xcf\x13V\x81\tw\x1b' \
     'w\xdduR\xda\xc6\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' \
     'x\x9c\x9d\x93?O\xc30\x10\xc5\xf7|\x8a\xdb\x9a\xa8m\x06\xd8*\x95' \
     '\x81B\xa1\xa2\xa2R\xcb\x86Pd\x9a\x0b5$vd_\x04\xfd\xf6\x9c\xff@' \
     '\x11!\x0b\xd9\xec\xf7\xbbw\xe7gG6\xad6\x04\xdaN\xc0\x92\xa0$)' \
     '\xb1\x82\xa2\xd1%\x16\xa4\x8b7\xa9\xca\xd4-\xb2Y\x02\xfc\xc9' \
     '\xcaS\xf9\xaeX\xed\xb6\xd77Q\x02\x83\xd4\x19\xf5--Y\xea\xe1W' \
     '\xab\xed\x10\xceR\x0f_\xdf\xdf\r\xe1,\xf5\xf0\xcb\xf5 \xceR\x0f' \
     '_\xdc\x0e\x0e\xc3R\x0f_\xae\x96\x9b!\x9e\xa5\x1e\xbf\xdb,\x06' \
     '\xc7q\x9a/\x88\x82\xc3B\xea\xb5\xb4TJ\x93\xb6\x82\x0e\xe16\xe6' \
     'KQ\xdb\xaf\xecG\xa3\xd1 \x01\xd3\x0b_^\xe8\xaa\xa0\xae\xad\xd1' \
     '&\xbef\x1bz\x08\xb0|\xc9Xz\x06\xf6Z\x91\x90J\xaa\x17\x90\xaa' \
     '\xd2\xa6\x11$5C\xcf\xba#\xa0\x03\x02*2\x92-\xfc\xb1\x94\xdf\xe2' \
     '\xae\xb8\'m\x8ey0^\x85\xd3\x82\xb4\xf0`:\x9c\x00\x8a\xfd\x01' \
     '\xb0\xc6\x86\x8b\xdd\xae\x80\xf3\xa9\x9fd\x16\n\x00R%\x1a\x06' \
     '\xe9\xd8b\x98\x1d\xf4\xf3+\x9bf\x01\xd8p\x1b\xf3.\xed\x9f^g\xc3' \
     '^\xd9W81T\xdb\xd5\x04sx|\xf2\xeb\xd6`%?x\xed"\x831\xbf\xf3\xdc' \
     'b\xeb%gaY\xe1\xad\x9f\xb9f\'1w\xa9\xa5a\x83s\x82J\xb98\xbc4\x8b' \
     '\x83\x00\x9f$z\xb8#\xa5\xb1\xdf\x98\xd9\xec\x1b\x89O\xe3Ts\x9a4' \
     '\x17m\x8b\xfc\x8f\xa5\x95\x9a\xfc\xfa\xed,\xe5|\xa1\xfe\x15\xb9' \
     '\xbc\xb2\x93\x1f\xf2\x95\xff\xdf,\x1a\xc5\xe7\x17*\x93Oz:>\x0e'
 
 data_non_inlined = '\x00\x00\x00\x01\x00\x00\x00\x00\x00\x01D\x19' \
     '\x00\x07e\x12\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff' \
     '\xff\xff\xff\xff\xd1\xf4\xbb\xb0\xbe\xfc\x13\xbd\x8c\xd3\x9d' \
     '\x0f\xcd\xd9;\x8c\x07\x8cJ/\x00\x00\x00\x00\x00\x00\x00\x00\x00' \
     '\x00\x00\x00\x00\x00\x00\x01D\x19\x00\x00\x00\x00\x00\xdf\x00' \
     '\x00\x01q\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\xff' \
     '\xff\xff\xff\xc1\x12\xb9\x04\x96\xa4Z1t\x91\xdfsJ\x90\xf0\x9bh' \
     '\x07l&\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' \
     '\x00\x01D\xf8\x00\x00\x00\x00\x01\x1b\x00\x00\x01\xb8\x00\x00' \
     '\x00\x01\x00\x00\x00\x02\x00\x00\x00\x01\xff\xff\xff\xff\x02\n' \
     '\x0e\xc6&\xa1\x92\xae6\x0b\x02i\xfe-\xe5\xbao\x05\xd1\xe7\x00' \
     '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01F' \
     '\x13\x00\x00\x00\x00\x01\xec\x00\x00\x03\x06\x00\x00\x00\x01' \
     '\x00\x00\x00\x03\x00\x00\x00\x02\xff\xff\xff\xff\x12\xcb\xeby1' \
     '\xb6\r\x98B\xcb\x07\xbd`\x8f\x92\xd9\xc4\x84\xbdK\x00\x00\x00' \
     '\x00\x00\x00\x00\x00\x00\x00\x00\x00'
 
 def parse_index2(data, inline):
     index, chunkcache = parsers.parse_index2(data, inline)
     return list(index), chunkcache
 
 def importparsers(hexversion):
     """Import mercurial.parsers with the given sys.hexversion."""
     # The file parsers.c inspects sys.hexversion to determine the version
     # of the currently-running Python interpreter, so we monkey-patch
     # sys.hexversion to simulate using different versions.
     code = ("import sys; sys.hexversion=%s; "
             "import mercurial.parsers" % hexversion)
     cmd = "python -c \"%s\"" % code
     # We need to do these tests inside a subprocess because parser.c's
     # version-checking code happens inside the module init function, and
     # when using reload() to reimport an extension module, "The init function
     # of extension modules is not called a second time"
     # (from http://docs.python.org/2/library/functions.html?#reload).
     p = subprocess.Popen(cmd, shell=True,
                          stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
     return p.communicate()  # returns stdout, stderr
 
 def printhexfail(testnumber, hexversion, stdout, expected):
     try:
         hexstring = hex(hexversion)
     except TypeError:
         hexstring = None
     print("FAILED: version test #%s with Python %s and patched "
           "sys.hexversion %r (%r):\n Expected %s but got:\n-->'%s'\n" %
           (testnumber, sys.version_info, hexversion, hexstring, expected,
            stdout))
 
 def testversionokay(testnumber, hexversion):
     stdout, stderr = importparsers(hexversion)
     if stdout:
         printhexfail(testnumber, hexversion, stdout, expected="no stdout")
 
 def testversionfail(testnumber, hexversion):
     stdout, stderr = importparsers(hexversion)
     # We include versionerrortext to distinguish from other ImportErrors.
     errtext = "ImportError: %s" % parsers.versionerrortext
     if errtext not in stdout:
         printhexfail(testnumber, hexversion, stdout,
                      expected="stdout to contain %r" % errtext)
 
 def makehex(major, minor, micro):
     return int("%x%02x%02x00" % (major, minor, micro), 16)
 
 def runversiontests():
     """Check the version-detection logic when importing parsers."""
     info = sys.version_info
     major, minor, micro = info[0], info[1], info[2]
     # Test same major-minor versions.
     testversionokay(1, makehex(major, minor, micro))
     testversionokay(2, makehex(major, minor, micro + 1))
     # Test different major-minor versions.
     testversionfail(3, makehex(major + 1, minor, micro))
     testversionfail(4, makehex(major, minor + 1, micro))
     testversionfail(5, "'foo'")
 
 def runtest() :
     # Only test the version-detection logic if it is present.
     try:
         parsers.versionerrortext
     except AttributeError:
         pass
     else:
         runversiontests()
 
     # Check that parse_index2() raises TypeError on bad arguments.
     try:
         parse_index2(0, True)
     except TypeError:
         pass
     else:
         print("Expected to get TypeError.")
 
    # Check parsers.parse_index2() on an index file against the original
    # Python implementation of parseindex, both with and without inlined data.
 
     py_res_1 = py_parseindex(data_inlined, True)
     c_res_1 = parse_index2(data_inlined, True)
 
     py_res_2 = py_parseindex(data_non_inlined, False)
     c_res_2 = parse_index2(data_non_inlined, False)
 
     if py_res_1 != c_res_1:
         print("Parse index result (with inlined data) differs!")
 
     if py_res_2 != c_res_2:
         print("Parse index result (no inlined data) differs!")
 
     ix = parsers.parse_index2(data_inlined, True)[0]
     for i, r in enumerate(ix):
         if r[7] == nullid:
             i = -1
         try:
             if ix[r[7]] != i:
                 print('Reverse lookup inconsistent for %r'
                     % r[7].encode('hex'))
         except TypeError:
             # pure version doesn't support this
             break
 
     print("done")
 
 runtest()