| 1 | import os
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| 2 | import struct
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| 3 |
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| 4 | # mangle() is used by both symbols and pycodegen.
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| 5 |
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| 6 | MANGLE_LEN = 256 # magic constant from compile.c
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| 7 |
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| 8 | def mangle(name, klass):
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| 9 | if klass is None: # nothing to mangle
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| 10 | return name
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| 11 | if not name.startswith('__'): # not a private var
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| 12 | return name
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| 13 |
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| 14 | if len(name) + 2 >= MANGLE_LEN:
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| 15 | return name
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| 16 | if name.endswith('__'):
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| 17 | return name
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| 18 | try:
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| 19 | i = 0
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| 20 | while klass[i] == '_':
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| 21 | i = i + 1
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| 22 | except IndexError:
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| 23 | return name
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| 24 | klass = klass[i:]
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| 25 |
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| 26 | tlen = len(klass) + len(name)
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| 27 | if tlen > MANGLE_LEN:
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| 28 | klass = klass[:MANGLE_LEN-tlen]
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| 29 |
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| 30 | return "_%s%s" % (klass, name)
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| 31 |
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| 32 |
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| 33 | PY27_MAGIC = b'\x03\xf3\r\n' # removed host dep imp.get_magic()
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| 34 |
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| 35 | def getPycHeader(filename):
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| 36 | # compile.c uses marshal to write a long directly, with
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| 37 | # calling the interface that would also generate a 1-byte code
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| 38 | # to indicate the type of the value. simplest way to get the
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| 39 | # same effect is to call marshal and then skip the code.
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| 40 | mtime = os.path.getmtime(filename)
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| 41 | mtime = struct.pack('<i', int(mtime))
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| 42 |
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| 43 | # Update for Python 3:
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| 44 | # https://nedbatchelder.com/blog/200804/the_structure_of_pyc_files.html
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| 45 | # https://gist.github.com/anonymous/35c08092a6eb70cdd723
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| 46 |
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| 47 | return PY27_MAGIC + mtime
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