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_precord.py

from pyrsistent._checked_types import CheckedType, _restore_pickle, InvariantException, store_invariants
from pyrsistent._field_common import (
    set_fields, check_type, is_field_ignore_extra_complaint, PFIELD_NO_INITIAL, serialize, check_global_invariants
)
from pyrsistent._pmap import PMap, pmap

class _PRecordMeta(type):
    def __new__(mcs, name, bases, dct):
        set_fields(dct, bases, name='_precord_fields')
        store_invariants(dct, bases, '_precord_invariants', '__invariant__')

dct['_precord_mandatory_fields'] = \
            set(name for name, field in dct['_precord_fields'].items() if field.mandatory)

dct['_precord_initial_values'] = \
            dict((k, field.initial) for k, field in dct['_precord_fields'].items() if field.initial is not PFIELD_NO_INITIAL)

dct['__slots__'] = ()

return super(_PRecordMeta, mcs).__new__(mcs, name, bases, dct)

class PRecord(PMap, CheckedType, metaclass=_PRecordMeta):
    """
    A PRecord is a PMap with a fixed set of specified fields. Records are declared as python classes inheriting
    from PRecord. Because it is a PMap it has full support for all Mapping methods such as iteration and element
    access using subscript notation.

More documentation and examples of PRecord usage is available at https://github.com/tobgu/pyrsistent
    """
    def __new__(cls, **kwargs):
        # Hack total! If these two special attributes exist that means we can create
        # ourselves. Otherwise we need to go through the Evolver to create the structures
        # for us.
        if '_precord_size' in kwargs and '_precord_buckets' in kwargs:
            return super(PRecord, cls).__new__(cls, kwargs['_precord_size'], kwargs['_precord_buckets'])

factory_fields = kwargs.pop('_factory_fields', None)
        ignore_extra = kwargs.pop('_ignore_extra', False)

initial_values = kwargs
        if cls._precord_initial_values:
            initial_values = dict((k, v() if callable(v) else v)
                                  for k, v in cls._precord_initial_values.items())
            initial_values.update(kwargs)

e = _PRecordEvolver(cls, pmap(pre_size=len(cls._precord_fields)), _factory_fields=factory_fields, _ignore_extra=ignore_extra)
        for k, v in initial_values.items():
            e[k] = v

return e.persistent()

def set(self, *args, **kwargs):
        """
        Set a field in the record. This set function differs slightly from that in the PMap
        class. First of all it accepts key-value pairs. Second it accepts multiple key-value
        pairs to perform one, atomic, update of multiple fields.
        """

# The PRecord set() can accept kwargs since all fields that have been declared are
        # valid python identifiers. Also allow multiple fields to be set in one operation.
        if args:
            return super(PRecord, self).set(args[0], args[1])

return self.update(kwargs)

def evolver(self):
        """
        Returns an evolver of this object.
        """
        return _PRecordEvolver(self.__class__, self)

def __repr__(self):
        return "{0}({1})".format(self.__class__.__name__,
                                 ', '.join('{0}={1}'.format(k, repr(v)) for k, v in self.items()))

@classmethod
    def create(cls, kwargs, _factory_fields=None, ignore_extra=False):
        """
        Factory method. Will create a new PRecord of the current type and assign the values
        specified in kwargs.

:param ignore_extra: A boolean which when set to True will ignore any keys which appear in kwargs that are not
                             in the set of fields on the PRecord.
        """
        if isinstance(kwargs, cls):
            return kwargs

if ignore_extra:
            kwargs = {k: kwargs[k] for k in cls._precord_fields if k in kwargs}

return cls(_factory_fields=_factory_fields, _ignore_extra=ignore_extra, **kwargs)

def __reduce__(self):
        # Pickling support
        return _restore_pickle, (self.__class__, dict(self),)

def serialize(self, format=None):
        """
        Serialize the current PRecord using custom serializer functions for fields where
        such have been supplied.
        """
        return dict((k, serialize(self._precord_fields[k].serializer, format, v)) for k, v in self.items())

class _PRecordEvolver(PMap._Evolver):
    __slots__ = ('_destination_cls', '_invariant_error_codes', '_missing_fields', '_factory_fields', '_ignore_extra')

def __init__(self, cls, original_pmap, _factory_fields=None, _ignore_extra=False):
        super(_PRecordEvolver, self).__init__(original_pmap)
        self._destination_cls = cls
        self._invariant_error_codes = []
        self._missing_fields = []
        self._factory_fields = _factory_fields
        self._ignore_extra = _ignore_extra

def __setitem__(self, key, original_value):
        self.set(key, original_value)

def set(self, key, original_value):
        field = self._destination_cls._precord_fields.get(key)
        if field:
            if self._factory_fields is None or field in self._factory_fields:
                try:
                    if is_field_ignore_extra_complaint(PRecord, field, self._ignore_extra):
                        value = field.factory(original_value, ignore_extra=self._ignore_extra)
                    else:
                        value = field.factory(original_value)
                except InvariantException as e:
                    self._invariant_error_codes += e.invariant_errors
                    self._missing_fields += e.missing_fields
                    return self
            else:
                value = original_value

check_type(self._destination_cls, field, key, value)

is_ok, error_code = field.invariant(value)
            if not is_ok:
                self._invariant_error_codes.append(error_code)

return super(_PRecordEvolver, self).set(key, value)
        else:
            raise AttributeError("'{0}' is not among the specified fields for {1}".format(key, self._destination_cls.__name__))

def persistent(self):
        cls = self._destination_cls
        is_dirty = self.is_dirty()
        pm = super(_PRecordEvolver, self).persistent()
        if is_dirty or not isinstance(pm, cls):
            result = cls(_precord_buckets=pm._buckets, _precord_size=pm._size)
        else:
            result = pm

if cls._precord_mandatory_fields:
            self._missing_fields += tuple('{0}.{1}'.format(cls.__name__, f) for f
                                          in (cls._precord_mandatory_fields - set(result.keys())))

if self._invariant_error_codes or self._missing_fields:
            raise InvariantException(tuple(self._invariant_error_codes), tuple(self._missing_fields),
                                     'Field invariant failed')

check_global_invariants(result, cls._precord_invariants)

return result

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2025-07-02 08:05:14
..	dir	-	root/root	drwxr-xr-x	2025-07-11 05:57:56
__pycache__	dir	-	root/root	drwxr-xr-x	2025-07-02 08:05:14
__init__.py	text/x-script.python	1.44 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
__init__.pyi	text/x-script.python	7.02 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_checked_types.py	text/x-script.python	17.94 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_field_common.py	text/x-script.python	11.68 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_helpers.py	text/x-script.python	3.16 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_immutable.py	text/x-script.python	3.21 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_pbag.py	text/x-script.python	6.57 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_pclass.py	text/x-script.python	9.47 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_pdeque.py	text/x-script.python	11.92 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_plist.py	text/x-script.python	8.1 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_pmap.py	text/x-script.python	18.34 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_precord.py	text/x-script.python	6.87 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_pset.py	text/x-script.python	5.56 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_pvector.py	text/x-script.python	22.16 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_toolz.py	text/plain	3.34 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
_transformations.py	text/x-script.python	3.71 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
py.typed	application/x-empty	0 B	root/root	-rw-r--r--	2025-06-09 11:12:39
typing.py	text/plain	1.73 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
typing.pyi	text/x-script.python	10.17 KB	root/root	-rw-r--r--	2025-06-09 11:12:39