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�
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cookie handling for web clients.

This is a backport of the Py3.3 ``http.cookiejar`` module for
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HTTP::Cookies, from the libwww-perl library.

Docstrings, comments and debug strings in this code refer to the
attributes of the HTTP cookie system as cookie-attributes, to distinguish
them clearly from Python attributes.

Class diagram (note that BSDDBCookieJar and the MSIE* classes are not
distributed with the Python standard library, but are available from
http://wwwsearch.sf.net/):

                        CookieJar____
                        /     \      \
            FileCookieJar      \      \
             /    |   \         \      \
 MozillaCookieJar | LWPCookieJar \      \
                  |               |      \
                  |   ---MSIEBase |       \
                  |  /      |     |        \
                  | /   MSIEDBCookieJar BSDDBCookieJar
                  |/
               MSIECookieJar

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    (\d+)              # year
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       (\d\d?):(\d\d)  # hour:min
       (?::(\d\d))?    # optional seconds
    )?                 # optional clock
       \s*
    ([-+]?\d{2,4}|(?![APap][Mm]\b)[A-Za-z]+)? # timezone
       \s*
    (?:\(\w+\))?       # ASCII representation of timezone in parens.
      
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    string contains no timezone, UTC is assumed.

    The timezone in the string may be numerical (like "-0800" or
"+0100") or a
    string timezone (like "UTC", "GMT", "BST"
or "EST").  Currently, only the
    timezone strings equivalent to UTC (zero offset) are known to the
function.

    The function loosely parses the following formats:

    Wed, 09 Feb 1994 22:23:32 GMT       -- HTTP format
    Tuesday, 08-Feb-94 14:15:29 GMT     -- old rfc850 HTTP format
    Tuesday, 08-Feb-1994 14:15:29 GMT   -- broken rfc850 HTTP format
    09 Feb 1994 22:23:32 GMT            -- HTTP format (no weekday)
    08-Feb-94 14:15:29 GMT              -- rfc850 format (no weekday)
    08-Feb-1994 14:15:29 GMT            -- broken rfc850 format (no
weekday)

    The parser ignores leading and trailing whitespace.  The time may be
    absent.

    If the year is given with only 2 digits, the function will select the
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      (\d\d?):?(\d\d)    # hour:min
      (?::?(\d\d(?:\.\d*)?))?  # optional seconds (and fractional)
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    1994-02-03 14:15:29 -0100    -- ISO 8601 format
    1994-02-03 14:15:29          -- zone is optional
    1994-02-03                   -- only date
    1994-02-03T14:15:29          -- Use T as separator
    19940203T141529Z             -- ISO 8601 compact format
    19940203                     -- only date

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parsed as if they
    were separated by ";".

    If the header_values passed as argument contains multiple values, then
they
    are treated as if they were a single value separated by comma
",".

    This means that this function is useful for parsing header fields that
    follow this syntax (BNF as from the HTTP/1.1 specification, but we
relax
    the requirement for tokens).

      headers           = #header
      header            = (token | parameter) *( [";"] (token |
parameter))

      token             = 1*<any CHAR except CTLs or separators>
      separators        = "(" | ")" | "<"
| ">" | "@"
                        | "," | ";" | ":" |
"\" | <">
                        | "/" | "[" | "]" |
"?" | "="
                        | "{" | "}" | SP | HT

      quoted-string     = ( <"> *(qdtext | quoted-pair )
<"> )
      qdtext            = <any TEXT except <">>
      quoted-pair       = "\" CHAR

      parameter         = attribute "=" value
      attribute         = token
      value             = token | quoted-string

    Each header is represented by a list of key/value pairs.  The value for
a
    simple token (not part of a parameter) is None.  Syntactically
incorrect
    headers will not necessarily be parsed as you would want.

    This is easier to describe with some examples:

    >>> split_header_words(['foo="bar";
port="80,81"; discard, bar=baz'])
    [[('foo', 'bar'), ('port',
'80,81'), ('discard', None)], [('bar',
'baz')]]
    >>> split_header_words(['text/html;
charset="iso-8859-1"'])
    [[('text/html', None), ('charset',
'iso-8859-1')]]
    >>> split_header_words([r'Basic
realm="\"foo\bar\""'])
    [[('Basic', None), ('realm',
'"foobar"')]]

   
iu\1u,u^[=\s;]*uN(tHEADER_TOKEN_RER:RaR;tHEADER_QUOTED_VALUE_REtHEADER_ESCAPE_RERTtHEADER_VALUE_REtrstripRtappendRRt
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("charset", "iso-8859/1")]])
    'text/plain; charset="iso-8859/1"'
    >>> join_header_words([[("text/plain", None)],
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parser for Netscape protocol cookie-attributes.

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    XXX This may not make the best possible effort to parse all the crap
    that Netscape Cookie headers contain.  Ronald Tschalar's
HTTPClient
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    Currently, this is also used for parsing RFC 2109 cookies.

   
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    Sometimes we compare one host name with another.  (Such comparisons
SHALL
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if

         *  their host name strings string-compare equal; or

         * A is a HDN string and has the form NB, where N is a non-empty
            name string, B has the form .B', and B' is a HDN
string.  (So,
            x.y.com domain-matches .Y.com but not Y.com.)

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          -  H has the form A.B; and

          -  A has no embedded (that is, interior) dots; and

          -  B has at least one embedded dot, or B is the string
"local".
             then the reach of H is .B.

       *  Otherwise, the reach of H is H.

    >>> reach("www.acme.com")
    '.acme.com'
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    'acme.com'
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    '.local'

   
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    objects -- it deals with cookie parsing, supplying defaults, and
    normalising to the representation used in this class.  CookiePolicy is
    responsible for checking them to see whether they should be accepted
from
    and returned to the server.

    Note that the port may be present in the headers, but unspecified
("Port"
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is None.

   
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