# Copyright (C) 2001-2006 Python Software Foundation
# Author: Barry Warsaw
# Contact: email-sig@python.org

"""email package exception classes."""


class MessageError(Exception):
 """Base class for errors in the email package."""


class MessageParseError(MessageError):
 """Base class for message parsing errors."""


class HeaderParseError(MessageParseError):
 """Error while parsing headers."""


class BoundaryError(MessageParseError):
 """Couldn't find terminating boundary."""


class MultipartConversionError(MessageError, TypeError):
 """Conversion to a multipart is prohibited."""


class CharsetError(MessageError):
 """An illegal charset was given."""


# These are parsing defects which the parser was able to work around.
class MessageDefect(ValueError):
 """Base class for a message defect."""

 def __init__(self, line=None):
 if line is not None:
 super().__init__(line)
 self.line = line

class NoBoundaryInMultipartDefect(MessageDefect):
 """A message claimed to be a multipart but had no boundary parameter."""

class StartBoundaryNotFoundDefect(MessageDefect):
 """The claimed start boundary was never found."""

class CloseBoundaryNotFoundDefect(MessageDefect):
 """A start boundary was found, but not the corresponding close boundary."""

class FirstHeaderLineIsContinuationDefect(MessageDefect):
 """A message had a continuation line as its first header line."""

class MisplacedEnvelopeHeaderDefect(MessageDefect):
 """A 'Unix-from' header was found in the middle of a header block."""

class MissingHeaderBodySeparatorDefect(MessageDefect):
 """Found line with no leading whitespace and no colon before blank line."""
# XXX: backward compatibility, just in case (it was never emitted).
MalformedHeaderDefect = MissingHeaderBodySeparatorDefect

class MultipartInvariantViolationDefect(MessageDefect):
 """A message claimed to be a multipart but no subparts were found."""

class InvalidMultipartContentTransferEncodingDefect(MessageDefect):
 """An invalid content transfer encoding was set on the multipart itself."""

class UndecodableBytesDefect(MessageDefect):
 """Header contained bytes that could not be decoded"""

class InvalidBase64PaddingDefect(MessageDefect):
 """base64 encoded sequence had an incorrect length"""

class InvalidBase64CharactersDefect(MessageDefect):
 """base64 encoded sequence had characters not in base64 alphabet"""

class InvalidBase64LengthDefect(MessageDefect):
 """base64 encoded sequence had invalid length (1 mod 4)"""

# These errors are specific to header parsing.

class HeaderDefect(MessageDefect):
 """Base class for a header defect."""

 def __init__(self, *args, **kw):
 super().__init__(*args, **kw)

class InvalidHeaderDefect(HeaderDefect):
 """Header is not valid, message gives details."""

class HeaderMissingRequiredValue(HeaderDefect):
 """A header that must have a value had none"""

class NonPrintableDefect(HeaderDefect):
 """ASCII characters outside the ascii-printable range found"""

 def __init__(self, non_printables):
 super().__init__(non_printables)
 self.non_printables = non_printables

 def __str__(self):
 return ("the following ASCII non-printables found in header: "
 "{}".format(self.non_printables))

class ObsoleteHeaderDefect(HeaderDefect):
 """Header uses syntax declared obsolete by RFC 5322"""

class NonASCIILocalPartDefect(HeaderDefect):
 """local_part contains non-ASCII characters"""
 # This defect only occurs during unicode parsing, not when
 # parsing messages decoded from binary.