Chip 2007 January, February, March & April/Chip-Cover-CD-2007-02.iso/Pakiet bezpieczenstwa/mini Pentoo LiveCD 2006.1/mpentoo-2006.1.iso/livecd.squashfs/usr/lib/python2.4/multifile.pyc

Python Compiled Bytecode | 2005-10-18 | 5KB | 191 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.4)

'''A readline()-style interface to the parts of a multipart message.

The MultiFile class makes each part of a multipart message "feel" like
an ordinary file, as long as you use fp.readline().  Allows recursive
use, for nested multipart messages.  Probably best used together
with module mimetools.

Suggested use:

real_fp = open(...)
fp = MultiFile(real_fp)

"read some lines from fp"
fp.push(separator)
while 1:
        "read lines from fp until it returns an empty string" (A)
        if not fp.next(): break
fp.pop()
"read remaining lines from fp until it returns an empty string"

The latter sequence may be used recursively at (A).
It is also allowed to use multiple push()...pop() sequences.

If seekable is given as 0, the class code will not do the bookkeeping
it normally attempts in order to make seeks relative to the beginning of the
current file part.  This may be useful when using MultiFile with a non-
seekable stream object.
'''
__all__ = [
    'MultiFile',
    'Error']

class Error(Exception):
    pass


class MultiFile:
    seekable = 0

    def __init__(self, fp, seekable = 1):
        self.fp = fp
        self.stack = []
        self.level = 0
        self.last = 0
        if seekable:
            self.seekable = 1
            self.start = self.fp.tell()
            self.posstack = []



    def tell(self):
        if self.level > 0:
            return self.lastpos

        return self.fp.tell() - self.start


    def seek(self, pos, whence = 0):
        here = self.tell()
        if whence:
            if whence == 1:
                pos = pos + here
            elif whence == 2:
                if self.level > 0:
                    pos = pos + self.lastpos
                else:
                    raise Error, "can't use whence=2 yet"


        if (not None if pos <= pos else pos <= here or self.level > 0) and pos > self.lastpos:
            raise Error, 'bad MultiFile.seek() call'

        self.fp.seek(pos + self.start)
        self.level = 0
        self.last = 0


    def readline(self):
        if self.level > 0:
            return ''

        line = self.fp.readline()
        if not line:
            self.level = len(self.stack)
            self.last = self.level > 0
            if self.last:
                raise Error, 'sudden EOF in MultiFile.readline()'

            return ''

        if not self.level == 0:
            raise AssertionError
        if self.is_data(line):
            return line
        else:
            marker = line.rstrip()
        for i, sep in enumerate(reversed(self.stack)):
            if marker == self.section_divider(sep):
                self.last = 0
                break
                continue
            if marker == self.end_marker(sep):
                self.last = 1
                break
                continue
        else:
            return line
        if self.seekable:
            self.lastpos = self.tell() - len(line)

        self.level = i + 1
        if self.level > 1:
            raise Error, 'Missing endmarker in MultiFile.readline()'

        return ''


    def readlines(self):
        list = []
        while None:
            line = self.readline()
            if not line:
                break

        return list


    def read(self):
        return ''.join(self.readlines())


    def next(self):
        while self.readline():
            pass
        if self.level > 1 or self.last:
            return 0

        self.level = 0
        self.last = 0
        if self.seekable:
            self.start = self.fp.tell()

        return 1


    def push(self, sep):
        if self.level > 0:
            raise Error, 'bad MultiFile.push() call'

        self.stack.append(sep)
        if self.seekable:
            self.posstack.append(self.start)
            self.start = self.fp.tell()



    def pop(self):
        if self.stack == []:
            raise Error, 'bad MultiFile.pop() call'

        if self.level <= 1:
            self.last = 0
        else:
            abslastpos = self.lastpos + self.start
        self.level = max(0, self.level - 1)
        self.stack.pop()
        if self.seekable:
            self.start = self.posstack.pop()
            if self.level > 0:
                self.lastpos = abslastpos - self.start




    def is_data(self, line):
        return line[:2] != '--'


    def section_divider(self, str):
        return '--' + str


    def end_marker(self, str):
        return '--' + str + '--'