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char.py

#
# This file is part of pyasn1 software.
#
# Copyright (c) 2005-2020, Ilya Etingof <etingof@gmail.com>
# License: https://pyasn1.readthedocs.io/en/latest/license.html
#
import sys

from pyasn1 import error
from pyasn1.type import tag
from pyasn1.type import univ

__all__ = ['NumericString', 'PrintableString', 'TeletexString', 'T61String', 'VideotexString',
           'IA5String', 'GraphicString', 'VisibleString', 'ISO646String',
           'GeneralString', 'UniversalString', 'BMPString', 'UTF8String']

NoValue = univ.NoValue
noValue = univ.noValue

class AbstractCharacterString(univ.OctetString):
    """Creates |ASN.1| schema or value object.

Keyword Args
    ------------
    value: :class:`str`, :class:`bytes` or |ASN.1| object
        :class:`str`, alternatively :class:`bytes`
        representing octet-stream of serialised unicode string
        (note `encoding` parameter) or |ASN.1| class instance.
        If `value` is not given, schema object will be created.

tagSet: :py:class:`~pyasn1.type.tag.TagSet`
        Object representing non-default ASN.1 tag(s)

subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
        Object representing non-default ASN.1 subtype constraint(s). Constraints
        verification for |ASN.1| type occurs automatically on object
        instantiation.

encoding: :py:class:`str`
        Unicode codec ID to encode/decode
        :class:`str` the payload when |ASN.1| object is used
        in octet-stream context.

Raises
    ------
    ~pyasn1.error.ValueConstraintError, ~pyasn1.error.PyAsn1Error
        On constraint violation or bad initializer.
    """

def __str__(self):
        return str(self._value)

def __bytes__(self):
        try:
            return self._value.encode(self.encoding)
        except UnicodeEncodeError as exc:
            raise error.PyAsn1UnicodeEncodeError(
                "Can't encode string '%s' with codec "
                "%s" % (self._value, self.encoding), exc
            )

def prettyIn(self, value):
        try:
            if isinstance(value, str):
                return value
            elif isinstance(value, bytes):
                return value.decode(self.encoding)
            elif isinstance(value, (tuple, list)):
                return self.prettyIn(bytes(value))
            elif isinstance(value, univ.OctetString):
                return value.asOctets().decode(self.encoding)
            else:
                return str(value)

except (UnicodeDecodeError, LookupError) as exc:
            raise error.PyAsn1UnicodeDecodeError(
                "Can't decode string '%s' with codec "
                "%s" % (value, self.encoding), exc
            )

def asOctets(self, padding=True):
        return bytes(self)

def asNumbers(self, padding=True):
        return tuple(bytes(self))

#
    # See OctetString.prettyPrint() for the explanation
    #

def prettyOut(self, value):
        return value

def prettyPrint(self, scope=0):
        # first see if subclass has its own .prettyOut()
        value = self.prettyOut(self._value)

if value is not self._value:
            return value

return AbstractCharacterString.__str__(self)

def __reversed__(self):
        return reversed(self._value)

class NumericString(AbstractCharacterString):
    __doc__ = AbstractCharacterString.__doc__

#: Set (on class, not on instance) or return a
    #: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
    #: associated with |ASN.1| type.
    tagSet = AbstractCharacterString.tagSet.tagImplicitly(
        tag.Tag(tag.tagClassUniversal, tag.tagFormatSimple, 18)
    )
    encoding = 'us-ascii'