/usr/lib/python3/dist-packages/dbf/ver_33.py is in python3-dbf 0.96.005-1.
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=========
Copyright
=========
- Portions copyright: 2008-2012 Ad-Mail, Inc -- All rights reserved.
- Portions copyright: 2012-2013 Ethan Furman -- All rights reserved.
- Author: Ethan Furman
- Contact: ethan@stoneleaf.us
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of Ad-Mail, Inc nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""
import codecs
import collections
import csv
import datetime
import os
import struct
import sys
import time
import weakref
from array import array
from bisect import bisect_left, bisect_right
from collections import defaultdict
from decimal import Decimal
from enum import Enum
from glob import glob
from math import floor
from os import SEEK_SET, SEEK_CUR, SEEK_END
import types
module = globals()
NoneType = type(None)
# Flag for behavior if bad data is encountered in a logical field
# Return None if True, else raise BadDataError
LOGICAL_BAD_IS_NONE = True
# treat non-unicode data as ...
input_decoding = 'ascii'
# if no codepage specified on dbf creation, use this
default_codepage = 'ascii'
# default format if none specified
default_type = 'db3'
temp_dir = os.environ.get("DBF_TEMP") or os.environ.get("TMP") or os.environ.get("TEMP") or ""
# signature:_meta of template records
_Template_Records = dict()
# dec jan feb mar apr may jun jul aug sep oct nov dec jan
days_per_month = [31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31]
days_per_leap_month = [31, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31]
class Enum(Enum):
"adds 'export_to()' function"
@classmethod
def export_to(cls, namespace):
namespace.update(cls.__members__)
class IntEnum(int, Enum):
pass
class HexEnum(IntEnum):
"repr is in hex"
def __repr__(self):
return '<%s.%s: %#02x>' % (
self.__class__.__name__,
self._name_,
self._value_,
)
class ValueAliasEnum(Enum):
"allows value aliases (not name aliases)"
def __new__(cls, int_value, *value_aliases):
obj = object.__new__(cls)
obj._value_ = int_value
for alias in value_aliases:
cls._value2member_map_[alias] = obj
return obj
class AutoEnum(IntEnum):
"""
Automatically numbers enum members starting from __number__ (defaults to 0).
Includes support for a custom docstring per member.
"""
__number__ = 0
def __new__(cls, *args):
"""Ignores arguments (will be handled in __init__."""
value = cls.__number__
cls.__number__ += 1
obj = int.__new__(cls, value)
obj._value_ = value
return obj
def __init__(self, *args):
"""Can handle 0 or 1 argument; more requires a custom __init__.
0 = auto-number w/o docstring
1 = auto-number w/ docstring
2+ = needs custom __init__
"""
if len(args) == 1 and isinstance(args[0], str):
self.__doc__ = args[0]
elif args:
raise TypeError('%s not dealt with -- need custom __init__' % (args,))
class IsoDay(IntEnum):
MONDAY = 1
TUESDAY = 2
WEDNESDAY = 3
THURSDAY = 4
FRIDAY = 5
SATURDAY = 6
SUNDAY = 7
def next_delta(self, day):
"""Return number of days needed to get from self to day."""
if self == day:
return 7
delta = day - self
if delta < 0:
delta += 7
return delta
def last_delta(self, day):
"""Return number of days needed to get from self to day."""
if self == day:
return -7
delta = day - self
if delta > 0:
delta -= 7
return delta
class RelativeDay(Enum):
LAST_SUNDAY = ()
LAST_SATURDAY = ()
LAST_FRIDAY = ()
LAST_THURSDAY = ()
LAST_WEDNESDAY = ()
LAST_TUESDAY = ()
LAST_MONDAY = ()
NEXT_MONDAY = ()
NEXT_TUESDAY = ()
NEXT_WEDNESDAY = ()
NEXT_THURSDAY = ()
NEXT_FRIDAY = ()
NEXT_SATURDAY = ()
NEXT_SUNDAY = ()
def __new__(cls):
result = object.__new__(cls)
result._value = len(cls.__members__) + 1
return result
def days_from(self, day):
target = IsoDay[self.name[5:]]
if self.name[:4] == 'LAST':
return day.last_delta(target)
return day.next_delta(target)
RelativeDay.export_to(module)
class IsoMonth(IntEnum):
JANUARY = 1
FEBRUARY = 2
MARCH = 3
APRIL = 4
MAY = 5
JUNE = 6
JULY = 7
AUGUST = 8
SEPTEMBER = 9
OCTOBER = 10
NOVEMBER = 11
DECEMBER = 12
def next_delta(self, month):
"""Return number of months needed to get from self to month."""
if self == month:
return 12
delta = month - self
if delta < 0:
delta += 12
return delta
def last_delta(self, month):
"""Return number of months needed to get from self to month."""
if self == month:
return -12
delta = month - self
if delta > 0:
delta -= 12
return delta
class RelativeMonth(Enum):
LAST_DECEMBER = ()
LAST_NOVEMBER = ()
LAST_OCTOBER = ()
LAST_SEPTEMBER = ()
LAST_AUGUST = ()
LAST_JULY = ()
LAST_JUNE = ()
LAST_MAY = ()
LAST_APRIL = ()
LAST_MARCH= ()
LAST_FEBRUARY = ()
LAST_JANUARY = ()
NEXT_JANUARY = ()
NEXT_FEBRUARY = ()
NEXT_MARCH = ()
NEXT_APRIL = ()
NEXT_MAY = ()
NEXT_JUNE = ()
NEXT_JULY = ()
NEXT_AUGUST = ()
NEXT_SEPTEMBER = ()
NEXT_OCTOBER = ()
NEXT_NOVEMBER = ()
NEXT_DECEMBER = ()
def __new__(cls):
result = object.__new__(cls)
result._value = len(cls.__members__) + 1
return result
def months_from(self, month):
target = IsoMonth[self.name[5:]]
if self.name[:4] == 'LAST':
return month.last_delta(target)
return month.next_delta(target)
RelativeMonth.export_to(module)
def is_leapyear(year):
if year % 400 == 0:
return True
elif year % 100 == 0:
return False
elif year % 4 == 0:
return True
else:
return False
# Constants
class LatinByte(HexEnum):
NULL = 0x00
LF = 0x0a
CR = 0x0d
EOF = 0x1a
ESC = 0x1b
SPACE = 0x20
ASTERISK = 0x2a
LatinByte.export_to(module)
class FieldType(IntEnum):
def __new__(cls, char):
int_value = ord(char)
obj = int.__new__(cls, int_value)
obj._value_ = int_value
obj.symbol = char.upper()
for alias in (
char.lower(),
char.upper(),
):
cls._value2member_map_[alias] = obj
cls._value2member_map_[alias.encode('ascii')] = obj
return obj
def __repr__(self):
return '<%s.%s: %r>' % (
self.__class__.__name__,
self._name_,
bytes([self._value_]),
)
_NULLFLAG = '0'
CHAR = 'C'
CURRENCY = 'Y'
DATE = 'D'
DATETIME = 'T'
DOUBLE = 'B'
FLOAT = 'F'
GENERAL = 'G'
INTEGER = 'I'
LOGICAL = 'L'
MEMO = 'M'
NUMERIC = 'N'
PICTURE = 'P'
FieldType.export_to(module)
class FieldFlag(IntEnum):
@classmethod
def lookup(cls, alias):
alias = alias.lower()
if alias in ('system', ):
return cls.SYSTEM
elif alias in ('null', 'nullable'):
return cls.NULLABLE
elif alias in ('binary', 'nocptrans'):
return cls.BINARY
else:
raise ValueError('no FieldFlag %r' % alias)
@property
def text(self):
if self is NULLABLE:
return 'null'
else:
return self._name_.lower()
SYSTEM = 0x01
NULLABLE = 0x02
BINARY = 0x04
NOCPTRANS = 0x04
#AUTOINC = 0x0c # not currently supported (not vfp 6)
FieldFlag.export_to(module)
class Field(AutoEnum):
__order__ = 'TYPE START LENGTH END DECIMALS FLAGS CLASS EMPTY NUL'
TYPE = "Char, Date, Logical, etc."
START = "Field offset in record"
LENGTH = "Length of field in record"
END = "End of field in record (exclusive)"
DECIMALS = "Number of decimal places if numeric"
FLAGS = "System, Binary, Nullable"
CLASS = "python class type"
EMPTY = "python function for empty field"
NUL = "python function for null field"
Field.export_to(module)
class DbfLocation(AutoEnum):
__order__ = 'IN_MEMORY ON_DISK'
IN_MEMORY = "dbf is kept in memory (disappears at program end)"
ON_DISK = "dbf is kept on disk"
DbfLocation.export_to(module)
class DbfStatus(AutoEnum):
__order__ = 'CLOSED READ_ONLY READ_WRITE'
CLOSED = 'closed (only meta information available)'
READ_ONLY = 'read-only'
READ_WRITE = 'read-write'
DbfStatus.export_to(module)
class LazyAttr:
"""
doesn't create object until actually accessed
"""
def __init__(yo, func=None, doc=None):
yo.fget = func
yo.__doc__ = doc or func.__doc__
def __call__(yo, func):
yo.fget = func
def __get__(yo, instance, owner):
if instance is None:
return yo
return yo.fget(instance)
class MutableDefault:
"""
Lives in the class, and on first access calls the supplied factory and
maps the result into the instance it was called on
"""
def __init__(self, func):
self._name = func.__name__
self.func = func
def __call__(self):
return self
def __get__(self, instance, owner):
result = self.func()
if instance is not None:
setattr(instance, self._name, result)
return result
def __repr__(self):
result = self.func()
return "MutableDefault(%r)" % (result, )
def none(*args, **kwargs):
"""
because we can't do `NoneType(*args, **kwargs)`
"""
return None
# warnings and errors
class DbfError(Exception):
"""
Fatal errors elicit this response.
"""
def __init__(self, message, *args):
Exception.__init__(self, message, *args)
self.message = message
class DataOverflowError(DbfError):
"""
Data too large for field
"""
def __init__(self, message, data=None):
DbfError.__init__(self, message)
self.data = data
class BadDataError(DbfError):
"""
bad data in table
"""
def __init__(self, message, data=None):
DbfError.__init__(self, message)
self.data = data
class FieldMissingError(KeyError, DbfError):
"""
Field does not exist in table
"""
def __init__(self, fieldname):
KeyError.__init__(self, '%s: no such field in table' % fieldname)
DbfError.__init__(self, '%s: no such field in table' % fieldname)
self.data = fieldname
class FieldSpecError(DbfError, ValueError):
"""
invalid field specification
"""
def __init__(self, message):
ValueError.__init__(self, message)
DbfError.__init__(self, message)
class NonUnicodeError(DbfError):
"""
Data for table not in unicode
"""
def __init__(self, message=None):
DbfError.__init__(self, message)
class NotFoundError(DbfError, ValueError, KeyError, IndexError):
"""
record criteria not met
"""
def __init__(self, message=None, data=None):
ValueError.__init__(self, message)
KeyError.__init__(self, message)
IndexError.__init__(self, message)
DbfError.__init__(self, message)
self.data = data
class DbfWarning(Exception):
"""
Normal operations elicit this response
"""
class Eof(DbfWarning, StopIteration):
"""
End of file reached
"""
message = 'End of file reached'
def __init__(self):
StopIteration.__init__(self, self.message)
DbfWarning.__init__(self, self.message)
class Bof(DbfWarning, StopIteration):
"""
Beginning of file reached
"""
message = 'Beginning of file reached'
def __init__(self):
StopIteration.__init__(self, self.message)
DbfWarning.__init__(self, self.message)
class DoNotIndex(DbfWarning):
"""
Returned by indexing functions to suppress a record from becoming part of the index
"""
message = 'Not indexing record'
def __init__(self):
DbfWarning.__init__(self, self.message)
# wrappers around datetime and logical objects to allow null values
# gets replaced later by their final values
Unknown = Other = object()
class NullType:
"""
Null object -- any interaction returns Null
"""
def _null(self, *args, **kwargs):
return self
__eq__ = __ne__ = __ge__ = __gt__ = __le__ = __lt__ = _null
__add__ = __iadd__ = __radd__ = _null
__sub__ = __isub__ = __rsub__ = _null
__mul__ = __imul__ = __rmul__ = _null
__div__ = __idiv__ = __rdiv__ = _null
__mod__ = __imod__ = __rmod__ = _null
__pow__ = __ipow__ = __rpow__ = _null
__and__ = __iand__ = __rand__ = _null
__xor__ = __ixor__ = __rxor__ = _null
__or__ = __ior__ = __ror__ = _null
__truediv__ = __itruediv__ = __rtruediv__ = _null
__floordiv__ = __ifloordiv__ = __rfloordiv__ = _null
__lshift__ = __ilshift__ = __rlshift__ = _null
__rshift__ = __irshift__ = __rrshift__ = _null
__neg__ = __pos__ = __abs__ = __invert__ = _null
__call__ = __getattr__ = _null
def __divmod__(self, other):
return self, self
__rdivmod__ = __divmod__
def __hash__(self):
raise TypeError("unhashable type: 'Null'")
def __new__(cls, *args):
return cls.null
def __bool__(self):
return False
def __repr__(self):
return '<null>'
def __setattr__(self, name, value):
return None
def __setitem___(self, index, value):
return None
def __str__(self):
return ''
NullType.null = object.__new__(NullType)
Null = NullType()
class Vapor:
"""
used in Vapor Records -- compares unequal with everything
"""
def __eq__(self, other):
return False
def __ne__(self, other):
return True
Vapor = Vapor()
class Char(str):
"""
Strips trailing whitespace, and ignores trailing whitespace for comparisons
"""
def __new__(cls, text=''):
if not isinstance(text, (basestring, cls)):
raise ValueError("Unable to automatically coerce %r to Char" % text)
result = str.__new__(cls, text.rstrip())
result.field_size = len(text)
return result
__hash__ = str.__hash__
def __eq__(self, other):
"""
ignores trailing whitespace
"""
if not isinstance(other, (self.__class__, basestring)):
return NotImplemented
return str(self) == other.rstrip()
def __ge__(self, other):
"""
ignores trailing whitespace
"""
if not isinstance(other, (self.__class__, basestring)):
return NotImplemented
return str(self) >= other.rstrip()
def __gt__(self, other):
"""
ignores trailing whitespace
"""
if not isinstance(other, (self.__class__, basestring)):
return NotImplemented
return str(self) > other.rstrip()
def __le__(self, other):
"""
ignores trailing whitespace
"""
if not isinstance(other, (self.__class__, basestring)):
return NotImplemented
return str(self) <= other.rstrip()
def __lt__(self, other):
"""
ignores trailing whitespace
"""
if not isinstance(other, (self.__class__, basestring)):
return NotImplemented
return str(self) < other.rstrip()
def __ne__(self, other):
"""
ignores trailing whitespace
"""
if not isinstance(other, (self.__class__, basestring)):
return NotImplemented
return str(self) != other.rstrip()
def __bool__(self):
"""
ignores trailing whitespace
"""
return bool(str(self))
def __add__(self, other):
result = self.__class__(str(self) + other)
result.field_size = self.field_size
return result
baseinteger = int
basestring = str, Char
class Date:
"""
adds null capable datetime.date constructs
"""
__slots__ = ['_date']
def __new__(cls, year=None, month=0, day=0):
"""
date should be either a datetime.date or date/month/day should
all be appropriate integers
"""
if year is None or year is Null:
return cls._null_date
nd = object.__new__(cls)
if isinstance(year, basestring):
return Date.strptime(year)
elif isinstance(year, (datetime.date)):
nd._date = year
elif isinstance(year, (Date)):
nd._date = year._date
else:
nd._date = datetime.date(year, month, day)
return nd
def __add__(self, other):
if self and isinstance(other, (datetime.timedelta)):
return Date(self._date + other)
else:
return NotImplemented
def __eq__(self, other):
if isinstance(other, self.__class__):
return self._date == other._date
if isinstance(other, datetime.date):
return self._date == other
if isinstance(other, type(None)):
return self._date is None
return NotImplemented
def __format__(self, spec):
if self:
return self._date.__format__(spec)
return ''
def __getattr__(self, name):
if name == '_date':
raise AttributeError('_date missing!')
elif self:
return getattr(self._date, name)
else:
raise AttributeError('NullDate object has no attribute %s' % name)
def __ge__(self, other):
if isinstance(other, (datetime.date)):
return self._date >= other
elif isinstance(other, (Date)):
if other:
return self._date >= other._date
return False
return NotImplemented
def __gt__(self, other):
if isinstance(other, (datetime.date)):
return self._date > other
elif isinstance(other, (Date)):
if other:
return self._date > other._date
return True
return NotImplemented
def __hash__(self):
return hash(self._date)
def __le__(self, other):
if self:
if isinstance(other, (datetime.date)):
return self._date <= other
elif isinstance(other, (Date)):
if other:
return self._date <= other._date
return False
else:
if isinstance(other, (datetime.date)):
return True
elif isinstance(other, (Date)):
if other:
return True
return True
return NotImplemented
def __lt__(self, other):
if self:
if isinstance(other, (datetime.date)):
return self._date < other
elif isinstance(other, (Date)):
if other:
return self._date < other._date
return False
else:
if isinstance(other, (datetime.date)):
return True
elif isinstance(other, (Date)):
if other:
return True
return False
return NotImplemented
def __ne__(self, other):
if self:
if isinstance(other, (datetime.date)):
return self._date != other
elif isinstance(other, (Date)):
if other:
return self._date != other._date
return True
else:
if isinstance(other, (datetime.date)):
return True
elif isinstance(other, (Date)):
if other:
return True
return False
return NotImplemented
def __bool__(self):
return self._date is not None
__radd__ = __add__
def __rsub__(self, other):
if self and isinstance(other, (datetime.date)):
return other - self._date
elif self and isinstance(other, (Date)):
return other._date - self._date
elif self and isinstance(other, (datetime.timedelta)):
return Date(other - self._date)
else:
return NotImplemented
def __repr__(self):
if self:
return "Date(%d, %d, %d)" % self.timetuple()[:3]
else:
return "Date()"
def __str__(self):
if self:
return str(self._date)
return ""
def __sub__(self, other):
if self and isinstance(other, (datetime.date)):
return self._date - other
elif self and isinstance(other, (Date)):
return self._date - other._date
elif self and isinstance(other, (datetime.timedelta)):
return Date(self._date - other)
else:
return NotImplemented
def date(self):
if self:
return self._date
return None
@classmethod
def fromordinal(cls, number):
if number:
return cls(datetime.date.fromordinal(number))
return cls()
@classmethod
def fromtimestamp(cls, timestamp):
return cls(datetime.date.fromtimestamp(timestamp))
@classmethod
def fromymd(cls, yyyymmdd):
if yyyymmdd in ('', ' ', 'no date'):
return cls()
return cls(datetime.date(int(yyyymmdd[:4]), int(yyyymmdd[4:6]), int(yyyymmdd[6:])))
def replace(self, year=None, month=None, day=None, delta_year=0, delta_month=0, delta_day=0):
if not self:
return self.__class__._null_date
old_year, old_month, old_day = self.timetuple()[:3]
if isinstance(month, RelativeMonth):
this_month = IsoMonth(old_month)
delta_month += month.months_from(this_month)
month = None
if isinstance(day, RelativeDay):
this_day = IsoDay(self.isoweekday())
delta_day += day.days_from(this_day)
day = None
year = (year or old_year) + delta_year
month = (month or old_month) + delta_month
day = (day or old_day) + delta_day
days_in_month = (days_per_month, days_per_leap_month)[is_leapyear(year)]
while not(0 < month < 13) or not (0 < day <= days_in_month[month]):
while month < 1:
year -= 1
month = 12 + month
while month > 12:
year += 1
month = month - 12
days_in_month = (days_per_month, days_per_leap_month)[is_leapyear(year)]
while day < 1:
month -= 1
day = days_in_month[month] + day
if not 0 < month < 13:
break
while day > days_in_month[month]:
day = day - days_in_month[month]
month += 1
if not 0 < month < 13:
break
return Date(year, month, day)
def strftime(self, format):
if self:
return self._date.strftime(format)
return ''
@classmethod
def strptime(cls, date_string, format=None):
if format is not None:
return cls(*(time.strptime(date_string, format)[0:3]))
return cls(*(time.strptime(date_string, "%Y-%m-%d")[0:3]))
@classmethod
def today(cls):
return cls(datetime.date.today())
def ymd(self):
if self:
return "%04d%02d%02d" % self.timetuple()[:3]
else:
return ' '
Date.max = Date(datetime.date.max)
Date.min = Date(datetime.date.min)
Date._null_date = object.__new__(Date)
Date._null_date._date = None
NullDate = Date()
class DateTime:
"""
adds null capable datetime.datetime constructs
"""
__slots__ = ['_datetime']
def __new__(cls, year=None, month=0, day=0, hour=0, minute=0, second=0, microsecond=0):
"""year may be a datetime.datetime"""
if year is None or year is Null:
return cls._null_datetime
ndt = object.__new__(cls)
if isinstance(year, basestring):
return DateTime.strptime(year)
elif isinstance(year, DateTime):
ndt._datetime = year._datetime
elif isinstance(year, datetime.datetime):
microsecond = year.microsecond // 1000 * 1000
hour, minute, second = year.hour, year.minute, year.second
year, month, day = year.year, year.month, year.day
ndt._datetime = datetime.datetime(year, month, day, hour, minute, second, microsecond)
elif year is not None:
microsecond = microsecond // 1000 * 1000
ndt._datetime = datetime.datetime(year, month, day, hour, minute, second, microsecond)
return ndt
def __add__(self, other):
if self and isinstance(other, (datetime.timedelta)):
return DateTime(self._datetime + other)
else:
return NotImplemented
def __eq__(self, other):
if isinstance(other, self.__class__):
return self._datetime == other._datetime
if isinstance(other, datetime.date):
return self._datetime == other
if isinstance(other, type(None)):
return self._datetime is None
return NotImplemented
def __format__(self, spec):
if self:
return self._datetime.__format__(spec)
return ''
def __getattr__(self, name):
if name == '_datetime':
raise AttributeError('_datetime missing!')
elif self:
return getattr(self._datetime, name)
else:
raise AttributeError('NullDateTime object has no attribute %s' % name)
def __ge__(self, other):
if self:
if isinstance(other, (datetime.datetime)):
return self._datetime >= other
elif isinstance(other, (DateTime)):
if other:
return self._datetime >= other._datetime
return False
else:
if isinstance(other, (datetime.datetime)):
return False
elif isinstance(other, (DateTime)):
if other:
return False
return True
return NotImplemented
def __gt__(self, other):
if self:
if isinstance(other, (datetime.datetime)):
return self._datetime > other
elif isinstance(other, (DateTime)):
if other:
return self._datetime > other._datetime
return True
else:
if isinstance(other, (datetime.datetime)):
return False
elif isinstance(other, (DateTime)):
if other:
return False
return False
return NotImplemented
def __hash__(self):
return self._datetime.__hash__()
def __le__(self, other):
if self:
if isinstance(other, (datetime.datetime)):
return self._datetime <= other
elif isinstance(other, (DateTime)):
if other:
return self._datetime <= other._datetime
return False
else:
if isinstance(other, (datetime.datetime)):
return True
elif isinstance(other, (DateTime)):
if other:
return True
return True
return NotImplemented
def __lt__(self, other):
if self:
if isinstance(other, (datetime.datetime)):
return self._datetime < other
elif isinstance(other, (DateTime)):
if other:
return self._datetime < other._datetime
return False
else:
if isinstance(other, (datetime.datetime)):
return True
elif isinstance(other, (DateTime)):
if other:
return True
return False
return NotImplemented
def __ne__(self, other):
if self:
if isinstance(other, (datetime.datetime)):
return self._datetime != other
elif isinstance(other, (DateTime)):
if other:
return self._datetime != other._datetime
return True
else:
if isinstance(other, (datetime.datetime)):
return True
elif isinstance(other, (DateTime)):
if other:
return True
return False
return NotImplemented
def __bool__(self):
return self._datetime is not None
__radd__ = __add__
def __rsub__(self, other):
if self and isinstance(other, (datetime.datetime)):
return other - self._datetime
elif self and isinstance(other, (DateTime)):
return other._datetime - self._datetime
elif self and isinstance(other, (datetime.timedelta)):
return DateTime(other - self._datetime)
else:
return NotImplemented
def __repr__(self):
if self:
return "DateTime(%5d, %2d, %2d, %2d, %2d, %2d, %2d)" % (
self._datetime.timetuple()[:6] + (self._datetime.microsecond, )
)
else:
return "DateTime()"
def __str__(self):
if self:
return str(self._datetime)
return ""
def __sub__(self, other):
if self and isinstance(other, (datetime.datetime)):
return self._datetime - other
elif self and isinstance(other, (DateTime)):
return self._datetime - other._datetime
elif self and isinstance(other, (datetime.timedelta)):
return DateTime(self._datetime - other)
else:
return NotImplemented
@classmethod
def combine(cls, date, time):
if Date(date) and Time(time):
return cls(date.year, date.month, date.day, time.hour, time.minute, time.second, time.microsecond)
return cls()
def date(self):
if self:
return Date(self.year, self.month, self.day)
return Date()
def datetime(self):
if self:
return self._datetime
return None
@classmethod
def fromordinal(cls, number):
if number:
return cls(datetime.datetime.fromordinal(number))
else:
return cls()
@classmethod
def fromtimestamp(cls, timestamp):
return DateTime(datetime.datetime.fromtimestamp(timestamp))
@classmethod
def now(cls):
return cls(datetime.datetime.now())
def replace(self, year=None, month=None, day=None, hour=None, minute=None, second=None, microsecond=None,
delta_year=0, delta_month=0, delta_day=0, delta_hour=0, delta_minute=0, delta_second=0):
if not self:
return self.__class__._null_datetime
old_year, old_month, old_day, old_hour, old_minute, old_second, old_micro = self.timetuple()[:7]
if isinstance(month, RelativeMonth):
this_month = IsoMonth(old_month)
delta_month += month.months_from(this_month)
month = None
if isinstance(day, RelativeDay):
this_day = IsoDay(self.isoweekday())
delta_day += day.days_from(this_day)
day = None
year = (year or old_year) + delta_year
month = (month or old_month) + delta_month
day = (day or old_day) + delta_day
hour = (hour or old_hour) + delta_hour
minute = (minute or old_minute) + delta_minute
second = (second or old_second) + delta_second
microsecond = microsecond or old_micro
days_in_month = (days_per_month, days_per_leap_month)[is_leapyear(year)]
while ( not (0 < month < 13)
or not (0 < day <= days_in_month[month])
or not (0 <= hour < 24)
or not (0 <= minute < 60)
or not (0 <= second < 60)
):
while month < 1:
year -= 1
month = 12 + month
while month > 12:
year += 1
month = month - 12
days_in_month = (days_per_month, days_per_leap_month)[is_leapyear(year)]
while day < 1:
month -= 1
day = days_in_month[month] + day
if not 0 < month < 13:
break
while day > days_in_month[month]:
day = day - days_in_month[month]
month += 1
if not 0 < month < 13:
break
while hour < 1:
day -= 1
hour = 24 + hour
while hour > 23:
day += 1
hour = hour - 24
while minute < 0:
hour -= 1
minute = 60 + minute
while minute > 59:
hour += 1
minute = minute - 60
while second < 0:
minute -= 1
second = 60 + second
while second > 59:
minute += 1
second = second - 60
return DateTime(year, month, day, hour, minute, second, microsecond)
def strftime(self, format):
if self:
return self._datetime.strftime(format)
return ''
@classmethod
def strptime(cls, datetime_string, format=None):
if format is not None:
return cls(datetime.datetime.strptime(datetime_string, format))
try:
return cls(datetime.datetime.strptime(datetime_string, "%Y-%m-%d %H:%M:%S.%f"))
except ValueError:
return cls(datetime.datetime.strptime(datetime_string, "%Y-%m-%d %H:%M:%S"))
def time(self):
if self:
return Time(self.hour, self.minute, self.second, self.microsecond)
return Time()
@classmethod
def utcnow(cls):
return cls(datetime.datetime.utcnow())
@classmethod
def today(cls):
return cls(datetime.datetime.today())
DateTime.max = DateTime(datetime.datetime.max)
DateTime.min = DateTime(datetime.datetime.min)
DateTime._null_datetime = object.__new__(DateTime)
DateTime._null_datetime._datetime = None
NullDateTime = DateTime()
class Time:
"""
adds null capable datetime.time constructs
"""
__slots__ = ['_time']
def __new__(cls, hour=None, minute=0, second=0, microsecond=0):
"""
hour may be a datetime.time or a str(Time)
"""
if hour is None or hour is Null:
return cls._null_time
nt = object.__new__(cls)
if isinstance(hour, basestring):
hour = Time.strptime(hour)
if isinstance(hour, Time):
nt._time = hour._time
elif isinstance(hour, (datetime.time)):
microsecond = hour.microsecond // 1000 * 1000
hour, minute, second = hour.hour, hour.minute, hour.second
nt._time = datetime.time(hour, minute, second, microsecond)
elif hour is not None:
microsecond = microsecond // 1000 * 1000
nt._time = datetime.time(hour, minute, second, microsecond)
return nt
def __add__(self, other):
if self and isinstance(other, (datetime.timedelta)):
t = self._time
t = datetime.datetime(2012, 6, 27, t.hour, t.minute, t.second, t.microsecond)
t += other
return Time(t.hour, t.minute, t.second, t.microsecond)
else:
return NotImplemented
def __eq__(self, other):
if isinstance(other, self.__class__):
return self._time == other._time
if isinstance(other, datetime.time):
return self._time == other
if isinstance(other, type(None)):
return self._time is None
return NotImplemented
def __format__(self, spec):
if self:
return self._time.__format__(spec)
return ''
def __getattr__(self, name):
if name == '_time':
raise AttributeError('_time missing!')
elif self:
return getattr(self._time, name)
else:
raise AttributeError('NullTime object has no attribute %s' % name)
def __ge__(self, other):
if self:
if isinstance(other, (datetime.time)):
return self._time >= other
elif isinstance(other, (Time)):
if other:
return self._time >= other._time
return False
else:
if isinstance(other, (datetime.time)):
return False
elif isinstance(other, (Time)):
if other:
return False
return True
return NotImplemented
def __gt__(self, other):
if self:
if isinstance(other, (datetime.time)):
return self._time > other
elif isinstance(other, (DateTime)):
if other:
return self._time > other._time
return True
else:
if isinstance(other, (datetime.time)):
return False
elif isinstance(other, (Time)):
if other:
return False
return False
return NotImplemented
def __hash__(self):
return self._datetime.__hash__()
def __le__(self, other):
if self:
if isinstance(other, (datetime.time)):
return self._time <= other
elif isinstance(other, (Time)):
if other:
return self._time <= other._time
return False
else:
if isinstance(other, (datetime.time)):
return True
elif isinstance(other, (Time)):
if other:
return True
return True
return NotImplemented
def __lt__(self, other):
if self:
if isinstance(other, (datetime.time)):
return self._time < other
elif isinstance(other, (Time)):
if other:
return self._time < other._time
return False
else:
if isinstance(other, (datetime.time)):
return True
elif isinstance(other, (Time)):
if other:
return True
return False
return NotImplemented
def __ne__(self, other):
if self:
if isinstance(other, (datetime.time)):
return self._time != other
elif isinstance(other, (Time)):
if other:
return self._time != other._time
return True
else:
if isinstance(other, (datetime.time)):
return True
elif isinstance(other, (Time)):
if other:
return True
return False
return NotImplemented
def __bool__(self):
return self._time is not None
__radd__ = __add__
def __rsub__(self, other):
if self and isinstance(other, (Time, datetime.time)):
t = self._time
t = datetime.datetime(2012, 6, 27, t.hour, t.minute, t.second, t.microsecond)
other = datetime.datetime(2012, 6, 27, other.hour, other.minute, other.second, other.microsecond)
other -= t
return other
else:
return NotImplemented
def __repr__(self):
if self:
return "Time(%d, %d, %d, %d)" % (self.hour, self.minute, self.second, self.microsecond)
else:
return "Time()"
def __str__(self):
if self:
return str(self._time)
return ""
def __sub__(self, other):
if self and isinstance(other, (Time, datetime.time)):
t = self._time
t = datetime.datetime(2012, 6, 27, t.hour, t.minute, t.second, t.microsecond)
o = datetime.datetime(2012, 6, 27, other.hour, other.minute, other.second, other.microsecond)
return t - o
elif self and isinstance(other, (datetime.timedelta)):
t = self._time
t = datetime.datetime(2012, 6, 27, t.hour, t.minute, t.second, t.microsecond)
t -= other
return Time(t.hour, t.minute, t.second, t.microsecond)
else:
return NotImplemented
@classmethod
def fromfloat(cls, num):
"2.5 == 2 hours, 30 minutes, 0 seconds, 0 microseconds"
if num < 0:
raise ValueError("positive value required (got %r)" % num)
if num == 0:
return Time(0)
hours = int(num)
if hours:
num = num % hours
minutes = int(num * 60)
if minutes:
num = num * 60 % minutes
else:
num = num * 60
seconds = int(num * 60)
if seconds:
num = num * 60 % seconds
else:
num = num * 60
microseconds = int(num * 1000)
return Time(hours, minutes, seconds, microseconds)
@staticmethod
def now():
return DateTime.now().time()
def replace(self, hour=None, minute=None, second=None, microsecond=None, delta_hour=0, delta_minute=0, delta_second=0):
if not self:
return self.__class__._null_time
old_hour, old_minute, old_second, old_micro = self.hour, self.minute, self.second, self.microsecond
hour = (hour or old_hour) + delta_hour
minute = (minute or old_minute) + delta_minute
second = (second or old_second) + delta_second
microsecond = microsecond or old_micro
while not (0 <= hour < 24) or not (0 <= minute < 60) or not (0 <= second < 60):
while second < 0:
minute -= 1
second = 60 + second
while second > 59:
minute += 1
second = second - 60
while minute < 0:
hour -= 1
minute = 60 + minute
while minute > 59:
hour += 1
minute = minute - 60
while hour < 1:
hour = 24 + hour
while hour > 23:
hour = hour - 24
return Time(hour, minute, second, microsecond)
def strftime(self, format):
if self:
return self._time.strftime(format)
return ''
@classmethod
def strptime(cls, time_string, format=None):
if format is not None:
return cls(datetime.time.strptime(time_string, format))
try:
return cls(datetime.time.strptime(time_string, "%H:%M:%S.%f"))
except ValueError:
return cls(datetime.time.strptime(time_string, "%H:%M:%S"))
def time(self):
if self:
return self._time
return None
def tofloat(self):
"returns Time as a float"
hour = self.hour
minute = self.minute * (1.0 / 60)
second = self.second * (1.0 / 3600)
microsecond = self.microsecond * (1.0 / 3600000)
return hour + minute + second + microsecond
Time.max = Time(datetime.time.max)
Time.min = Time(datetime.time.min)
Time._null_time = object.__new__(Time)
Time._null_time._time = None
NullTime = Time()
class Period:
"for matching various time ranges"
def __init__(self, year=None, month=None, day=None, hour=None, minute=None, second=None, microsecond=None):
params = vars()
self._mask = {}
for attr in ('year', 'month', 'day', 'hour', 'minute', 'second', 'microsecond'):
value = params[attr]
if value is not None:
self._mask[attr] = value
def __contains__(self, other):
if not self._mask:
return True
for attr, value in self._mask.items():
other_value = getattr(other, attr, None)
try:
if other_value == value or other_value in value:
continue
except TypeError:
pass
return False
return True
def __repr__(self):
items = []
for attr in ('year', 'month', 'day', 'hour', 'minute', 'second', 'microsecond'):
if attr in self._mask:
items.append('%s=%s' % (attr, self._mask[attr]))
return "Period(%s)" % ', '.join(items)
class Logical:
"""
Logical field return type.
Accepts values of True, False, or None/Null.
boolean value of Unknown is False (use Quantum if you want an exception instead.
"""
def __new__(cls, value=None):
if value is None or value is Null or value is Other or value is Unknown:
return cls.unknown
elif isinstance(value, basestring):
if value.lower() in ('t', 'true', 'y', 'yes', 'on'):
return cls.true
elif value.lower() in ('f', 'false', 'n', 'no', 'off'):
return cls.false
elif value.lower() in ('?', 'unknown', 'null', 'none', ' ', ''):
return cls.unknown
else:
raise ValueError('unknown value for Logical: %s' % value)
else:
return (cls.false, cls.true)[bool(value)]
def __add__(x, y):
if isinstance(y, type(None)) or y is Unknown or x is Unknown:
return Unknown
try:
i = int(y)
except Exception:
return NotImplemented
return int(x) + i
__radd__ = __iadd__ = __add__
def __sub__(x, y):
if isinstance(y, type(None)) or y is Unknown or x is Unknown:
return Unknown
try:
i = int(y)
except Exception:
return NotImplemented
return int(x) - i
__isub__ = __sub__
def __rsub__(y, x):
if isinstance(x, type(None)) or x is Unknown or y is Unknown:
return Unknown
try:
i = int(x)
except Exception:
return NotImplemented
return i - int(y)
def __mul__(x, y):
if x == 0 or y == 0:
return 0
elif isinstance(y, type(None)) or y is Unknown or x is Unknown:
return Unknown
try:
i = int(y)
except Exception:
return NotImplemented
return int(x) * i
__rmul__ = __imul__ = __mul__
def __div__(x, y):
if isinstance(y, type(None)) or y == 0 or y is Unknown or x is Unknown:
return Unknown
try:
i = int(y)
except Exception:
return NotImplemented
return int(x).__div__(i)
__idiv__ = __div__
def __rdiv__(y, x):
if isinstance(x, type(None)) or y == 0 or x is Unknown or y is Unknown:
return Unknown
try:
i = int(x)
except Exception:
return NotImplemented
return i.__div__(int(y))
def __truediv__(x, y):
if isinstance(y, type(None)) or y == 0 or y is Unknown or x is Unknown:
return Unknown
try:
i = int(y)
except Exception:
return NotImplemented
return int(x).__truediv__(i)
__itruediv__ = __truediv__
def __rtruediv__(y, x):
if isinstance(x, type(None)) or y == 0 or y is Unknown or x is Unknown:
return Unknown
try:
i = int(x)
except Exception:
return NotImplemented
return i.__truediv__(int(y))
def __floordiv__(x, y):
if isinstance(y, type(None)) or y == 0 or y is Unknown or x is Unknown:
return Unknown
try:
i = int(y)
except Exception:
return NotImplemented
return int(x).__floordiv__(i)
__ifloordiv__ = __floordiv__
def __rfloordiv__(y, x):
if isinstance(x, type(None)) or y == 0 or y is Unknown or x is Unknown:
return Unknown
try:
i = int(x)
except Exception:
return NotImplemented
return i.__floordiv__(int(y))
def __divmod__(x, y):
if isinstance(y, type(None)) or y == 0 or y is Unknown or x is Unknown:
return (Unknown, Unknown)
try:
i = int(y)
except Exception:
return NotImplemented
return divmod(int(x), i)
def __rdivmod__(y, x):
if isinstance(x, type(None)) or y == 0 or y is Unknown or x is Unknown:
return (Unknown, Unknown)
try:
i = int(x)
except Exception:
return NotImplemented
return divmod(i, int(y))
def __mod__(x, y):
if isinstance(y, type(None)) or y == 0 or y is Unknown or x is Unknown:
return Unknown
try:
i = int(y)
except Exception:
return NotImplemented
return int(x) % i
__imod__ = __mod__
def __rmod__(y, x):
if isinstance(x, type(None)) or y == 0 or x is Unknown or y is Unknown:
return Unknown
try:
i = int(x)
except Exception:
return NotImplemented
return i % int(y)
def __pow__(x, y):
if not isinstance(y, (x.__class__, bool, type(None), baseinteger)):
return NotImplemented
if isinstance(y, type(None)) or y is Unknown:
return Unknown
i = int(y)
if i == 0:
return 1
if x is Unknown:
return Unknown
return int(x) ** i
__ipow__ = __pow__
def __rpow__(y, x):
if not isinstance(x, (y.__class__, bool, type(None), baseinteger)):
return NotImplemented
if y is Unknown:
return Unknown
i = int(y)
if i == 0:
return 1
if x is Unknown or isinstance(x, type(None)):
return Unknown
return int(x) ** i
def __lshift__(x, y):
if isinstance(y, type(None)) or x is Unknown or y is Unknown:
return Unknown
return int(x.value) << int(y)
__ilshift__ = __lshift__
def __rlshift__(y, x):
if isinstance(x, type(None)) or x is Unknown or y is Unknown:
return Unknown
return int(x) << int(y)
def __rshift__(x, y):
if isinstance(y, type(None)) or x is Unknown or y is Unknown:
return Unknown
return int(x.value) >> int(y)
__irshift__ = __rshift__
def __rrshift__(y, x):
if isinstance(x, type(None)) or x is Unknown or y is Unknown:
return Unknown
return int(x) >> int(y)
def __neg__(x):
"NEG (negation)"
if x in (Truth, Falsth):
return -x.value
return Unknown
def __pos__(x):
"POS (posation)"
if x in (Truth, Falsth):
return +x.value
return Unknown
def __abs__(x):
if x in (Truth, Falsth):
return abs(x.value)
return Unknown
def __invert__(x):
if x in (Truth, Falsth):
return ~x.value
return Unknown
def __complex__(x):
if x.value is None:
raise ValueError("unable to return complex() of %r" % x)
return complex(x.value)
def __int__(x):
if x.value is None:
raise ValueError("unable to return int() of %r" % x)
return int(x.value)
def __float__(x):
if x.value is None:
raise ValueError("unable to return float() of %r" % x)
return float(x.value)
def __and__(x, y):
"""
AND (conjunction) x & y:
True iff both x, y are True
False iff at least one of x, y is False
Unknown otherwise
"""
if (isinstance(x, baseinteger) and not isinstance(x, bool)) or (isinstance(y, baseinteger) and not isinstance(y, bool)):
if x == 0 or y == 0:
return 0
elif x is Unknown or y is Unknown:
return Unknown
return int(x) & int(y)
elif x in (False, Falsth) or y in (False, Falsth):
return Falsth
elif x in (True, Truth) and y in (True, Truth):
return Truth
elif isinstance(x, type(None)) or isinstance(y, type(None)) or y is Unknown or x is Unknown:
return Unknown
return NotImplemented
__rand__ = __and__
def __or__(x, y):
"OR (disjunction): x | y => True iff at least one of x, y is True"
if (isinstance(x, baseinteger) and not isinstance(x, bool)) or (isinstance(y, baseinteger) and not isinstance(y, bool)):
if x is Unknown or y is Unknown:
return Unknown
return int(x) | int(y)
elif x in (True, Truth) or y in (True, Truth):
return Truth
elif x in (False, Falsth) and y in (False, Falsth):
return Falsth
elif isinstance(x, type(None)) or isinstance(y, type(None)) or y is Unknown or x is Unknown:
return Unknown
return NotImplemented
__ror__ = __or__
def __xor__(x, y):
"XOR (parity) x ^ y: True iff only one of x,y is True"
if (isinstance(x, baseinteger) and not isinstance(x, bool)) or (isinstance(y, baseinteger) and not isinstance(y, bool)):
if x is Unknown or y is Unknown:
return Unknown
return int(x) ^ int(y)
elif x in (True, Truth, False, Falsth) and y in (True, Truth, False, Falsth):
return {
(True, True) : Falsth,
(True, False) : Truth,
(False, True) : Truth,
(False, False): Falsth,
}[(x, y)]
elif isinstance(x, type(None)) or isinstance(y, type(None)) or y is Unknown or x is Unknown:
return Unknown
return NotImplemented
__rxor__ = __xor__
def __bool__(x):
"boolean value of Unknown is assumed False"
return x.value is True
def __eq__(x, y):
if isinstance(y, x.__class__):
return x.value == y.value
elif isinstance(y, (bool, NoneType, baseinteger)):
return x.value == y
return NotImplemented
def __ge__(x, y):
if isinstance(y, type(None)) or x is Unknown or y is Unknown:
return x.value == None
elif isinstance(y, x.__class__):
return x.value >= y.value
elif isinstance(y, (bool, baseinteger)):
return x.value >= y
return NotImplemented
def __gt__(x, y):
if isinstance(y, type(None)) or x is Unknown or y is Unknown:
return False
elif isinstance(y, x.__class__):
return x.value > y.value
elif isinstance(y, (bool, baseinteger)):
return x.value > y
return NotImplemented
def __le__(x, y):
if isinstance(y, type(None)) or x is Unknown or y is Unknown:
return x.value == None
elif isinstance(y, x.__class__):
return x.value <= y.value
elif isinstance(y, (bool, baseinteger)):
return x.value <= y
return NotImplemented
def __lt__(x, y):
if isinstance(y, type(None)) or x is Unknown or y is Unknown:
return False
elif isinstance(y, x.__class__):
return x.value < y.value
elif isinstance(y, (bool, baseinteger)):
return x.value < y
return NotImplemented
def __ne__(x, y):
if isinstance(y, x.__class__):
return x.value != y.value
elif isinstance(y, (bool, type(None), baseinteger)):
return x.value != y
return NotImplemented
def __hash__(x):
return hash(x.value)
def __index__(x):
if x.value is None:
raise ValueError("unable to return int() of %r" % x)
return int(x.value)
def __repr__(x):
return "Logical(%r)" % x.string
def __str__(x):
return x.string
Logical.true = object.__new__(Logical)
Logical.true.value = True
Logical.true.string = 'T'
Logical.false = object.__new__(Logical)
Logical.false.value = False
Logical.false.string = 'F'
Logical.unknown = object.__new__(Logical)
Logical.unknown.value = None
Logical.unknown.string = '?'
Truth = Logical(True)
Falsth = Logical(False)
Unknown = Logical()
class Quantum(object):
"""
Logical field return type that implements boolean algebra
Accepts values of True/On, False/Off, or None/Null/Unknown/Other
"""
def __new__(cls, value=None):
if value is None or value is Null or value is Other or value is Unknown:
return cls.unknown
elif isinstance(value, basestring):
if value.lower() in ('t', 'true', 'y', 'yes', 'on'):
return cls.true
elif value.lower() in ('f', 'false', 'n', 'no', 'off'):
return cls.false
elif value.lower() in ('?', 'unknown', 'null', 'none', ' ', ''):
return cls.unknown
else:
raise ValueError('unknown value for Quantum: %s' % value)
else:
return (cls.false, cls.true)[bool(value)]
def A(x, y):
"OR (disjunction): x | y => True iff at least one of x, y is True"
if not isinstance(y, (x.__class__, bool, NullType, type(None))):
return NotImplemented
if x.value is True or y is not Other and y == True:
return x.true
elif x.value is False and y is not Other and y == False:
return x.false
return Other
def _C_material(x, y):
"IMP (material implication) x >> y => False iff x == True and y == False"
if not isinstance(y, (x.__class__, bool, NullType, type(None))):
return NotImplemented
if (x.value is False
or (x.value is True and y is not Other and y == True)):
return x.true
elif x.value is True and y is not Other and y == False:
return False
return Other
def _C_material_reversed(y, x):
"IMP (material implication) x >> y => False iff x = True and y = False"
if not isinstance(x, (y.__class__, bool, NullType, type(None))):
return NotImplemented
if (x is not Other and x == False
or (x is not Other and x == True and y.value is True)):
return y.true
elif x is not Other and x == True and y.value is False:
return y.false
return Other
def _C_relevant(x, y):
"IMP (relevant implication) x >> y => True iff both x, y are True, False iff x == True and y == False, Other if x is False"
if not isinstance(y, (x.__class__, bool, NullType, type(None))):
return NotImplemented
if x.value is True and y is not Other and y == True:
return x.true
if x.value is True and y is not Other and y == False:
return x.false
return Other
def _C_relevant_reversed(y, x):
"IMP (relevant implication) x >> y => True iff both x, y are True, False iff x == True and y == False, Other if y is False"
if not isinstance(x, (y.__class__, bool, NullType, type(None))):
return NotImplemented
if x is not Other and x == True and y.value is True:
return y.true
if x is not Other and x == True and y.value is False:
return y.false
return Other
def D(x, y):
"NAND (negative AND) x.D(y): False iff x and y are both True"
if not isinstance(y, (x.__class__, bool, NullType, type(None))):
return NotImplemented
if x.value is False or y is not Other and y == False:
return x.true
elif x.value is True and y is not Other and y == True:
return x.false
return Other
def E(x, y):
"EQV (equivalence) x.E(y): True iff x and y are the same"
if not isinstance(y, (x.__class__, bool, NullType, type(None))):
return NotImplemented
elif (
(x.value is True and y is not Other and y == True)
or
(x.value is False and y is not Other and y == False)
):
return x.true
elif (
(x.value is True and y is not Other and y == False)
or
(x.value is False and y is not Other and y == True)
):
return x.false
return Other
def J(x, y):
"XOR (parity) x ^ y: True iff only one of x,y is True"
if not isinstance(y, (x.__class__, bool, NullType, type(None))):
return NotImplemented
if (
(x.value is True and y is not Other and y == False)
or
(x.value is False and y is not Other and y == True)
):
return x.true
if (
(x.value is False and y is not Other and y == False)
or
(x.value is True and y is not Other and y == True)
):
return x.false
return Other
def K(x, y):
"AND (conjunction) x & y: True iff both x, y are True"
if not isinstance(y, (x.__class__, bool, NullType, type(None))):
return NotImplemented
if x.value is True and y is not Other and y == True:
return x.true
elif x.value is False or y is not Other and y == False:
return x.false
return Other
def N(x):
"NEG (negation) -x: True iff x = False"
if x is x.true:
return x.false
elif x is x.false:
return x.true
return Other
@classmethod
def set_implication(cls, method):
"sets IMP to material or relevant"
if not isinstance(method, basestring) or method.lower() not in ('material', 'relevant'):
raise ValueError("method should be 'material' (for strict boolean) or 'relevant', not %r'" % method)
if method.lower() == 'material':
cls.C = cls._C_material
cls.__rshift__ = cls._C_material
cls.__rrshift__ = cls._C_material_reversed
elif method.lower() == 'relevant':
cls.C = cls._C_relevant
cls.__rshift__ = cls._C_relevant
cls.__rrshift__ = cls._C_relevant_reversed
def __eq__(x, y):
if not isinstance(y, (x.__class__, bool, NullType, type(None))):
return NotImplemented
if (
(x.value is True and y is not Other and y == True)
or
(x.value is False and y is not Other and y == False)
):
return x.true
elif (
(x.value is True and y is not Other and y == False)
or
(x.value is False and y is not Other and y == True)
):
return x.false
return Other
def __hash__(x):
return hash(x.value)
def __ne__(x, y):
if not isinstance(y, (x.__class__, bool, NullType, type(None))):
return NotImplemented
if (
(x.value is True and y is not Other and y == False)
or
(x.value is False and y is not Other and y == True)
):
return x.true
elif (
(x.value is True and y is not Other and y == True)
or
(x.value is False and y is not Other and y == False)
):
return x.false
return Other
def __bool__(x):
if x is Other:
raise TypeError('True/False value of %r is unknown' % x)
return x.value is True
def __repr__(x):
return "Quantum(%r)" % x.string
def __str__(x):
return x.string
__add__ = A
__and__ = K
__mul__ = K
__neg__ = N
__or__ = A
__radd__ = A
__rand__ = K
__rshift__ = None
__rmul__ = K
__ror__ = A
__rrshift__ = None
__rxor__ = J
__xor__ = J
Quantum.true = object.__new__(Quantum)
Quantum.true.value = True
Quantum.true.string = 'Y'
Quantum.false = object.__new__(Quantum)
Quantum.false.value = False
Quantum.false.string = 'N'
Quantum.unknown = object.__new__(Quantum)
Quantum.unknown.value = None
Quantum.unknown.string = '?'
Quantum.set_implication('material')
On = Quantum(True)
Off = Quantum(False)
Other = Quantum()
# add xmlrpc support
from xmlrpc.client import Marshaller
Marshaller.dispatch[Char] = Marshaller.dump_unicode
Marshaller.dispatch[Logical] = Marshaller.dump_bool
Marshaller.dispatch[DateTime] = Marshaller.dump_datetime
del Marshaller
# Internal classes
class _Navigation(object):
"""
Navigation base class that provides VPFish movement methods
"""
_index = -1
def _nav_check(self):
"""
implemented by subclass; must return True if underlying structure meets need
"""
raise NotImplementedError()
def _get_index(self, direction, n=1, start=None):
"""
returns index of next available record towards direction
"""
if start is not None:
index = start
else:
index = self._index
if direction == 'reverse':
move = -1 * n
limit = 0
index += move
if index < limit:
return -1
else:
return index
elif direction == 'forward':
move = +1 * n
limit = len(self) - 1
index += move
if index > limit:
return len(self)
else:
return index
else:
raise ValueError("direction should be 'forward' or 'reverse', not %r" % direction)
@property
def bof(self):
"""
returns True if no more usable records towards the beginning of the table
"""
self._nav_check()
index = self._get_index('reverse')
return index == -1
def bottom(self):
"""
sets record index to bottom of table (end of table)
"""
self._nav_check()
self._index = len(self)
return self._index
@property
def current_record(self):
"""
returns current record (deleted or not)
"""
self._nav_check()
index = self._index
if index < 0:
return RecordVaporWare('bof', self)
elif index >= len(self):
return RecordVaporWare('eof', self)
return self[index]
@property
def current(self):
"""
returns current index
"""
self._nav_check()
return self._index
@property
def eof(self):
"""
returns True if no more usable records towards the end of the table
"""
self._nav_check()
index = self._get_index('forward')
return index == len(self)
@property
def first_record(self):
"""
returns first available record (does not move index)
"""
self._nav_check()
index = self._get_index('forward', start=-1)
if -1 < index < len(self):
return self[index]
else:
return RecordVaporWare('bof', self)
def goto(self, where):
"""
changes the record pointer to the first matching (deleted) record
where should be either an integer, or 'top' or 'bottom'.
top -> before first record
bottom -> after last record
"""
self._nav_check()
max = len(self)
if isinstance(where, baseinteger):
if not -max <= where < max:
raise IndexError("Record %d does not exist" % where)
if where < 0:
where += max
self._index = where
return self._index
move = getattr(self, where, None)
if move is None:
raise DbfError("unable to go to %r" % where)
return move()
@property
def last_record(self):
"""
returns last available record (does not move index)
"""
self._nav_check()
index = self._get_index('reverse', start=len(self))
if -1 < index < len(self):
return self[index]
else:
return RecordVaporWare('bof', self)
@property
def next_record(self):
"""
returns next available record (does not move index)
"""
self._nav_check()
index = self._get_index('forward')
if -1 < index < len(self):
return self[index]
else:
return RecordVaporWare('eof', self)
@property
def prev_record(self):
"""
returns previous available record (does not move index)
"""
self._nav_check()
index = self._get_index('reverse')
if -1 < index < len(self):
return self[index]
else:
return RecordVaporWare('bof', self)
def skip(self, n=1):
"""
move index to the next nth available record
"""
self._nav_check()
if n < 0:
n *= -1
direction = 'reverse'
else:
direction = 'forward'
self._index = index = self._get_index(direction, n)
if index < 0:
raise Bof()
elif index >= len(self):
raise Eof()
else:
return index
def top(self):
"""
sets record index to top of table (beginning of table)
"""
self._nav_check()
self._index = -1
return self._index
class Record(object):
"""
Provides routines to extract and save data within the fields of a
dbf record.
"""
__slots__ = ('_recnum', '_meta', '_data', '_old_data', '_dirty',
'_memos', '_write_to_disk', '__weakref__')
def __new__(cls, recnum, layout, kamikaze=b'', _fromdisk=False):
"""
record = ascii array of entire record;
layout=record specification;
memo = memo object for table
"""
record = object.__new__(cls)
record._dirty = False
record._recnum = recnum
record._meta = layout
record._memos = {}
record._write_to_disk = True
record._old_data = None
header = layout.header
record._data = layout.blankrecord[:]
if kamikaze and len(record._data) != len(kamikaze):
raise BadDataError("record data is not the correct length (should be %r, not %r)" %
(len(record._data), len(kamikaze)), data=kamikaze[:])
if recnum == -1: # not a disk-backed record
return record
elif type(kamikaze) == array:
record._data = kamikaze[:]
elif type(kamikaze) == bytes:
if kamikaze:
record._data = array('B', kamikaze)
else:
raise BadDataError("%r recieved for record data" % kamikaze)
if record._data[0] == NULL:
record._data[0] = SPACE
if record._data[0] not in (SPACE, ASTERISK):
raise DbfError("record data not correct -- first character should be a ' ' or a '*'.")
if not _fromdisk and layout.location == ON_DISK:
record._update_disk()
return record
def __contains__(self, value):
for field in self._meta.user_fields:
if self[field] == value:
return True
return False
def __enter__(self):
if not self._write_to_disk:
raise DbfError("`with record` is not reentrant")
self._start_flux()
return self
def __eq__(self, other):
if not isinstance(other, (Record, RecordTemplate, dict, tuple)):
return NotImplemented
if isinstance(other, (Record, RecordTemplate)):
if field_names(self) != field_names(other):
return False
for field in self._meta.user_fields:
s_value, o_value = self[field], other[field]
if s_value is not o_value and s_value != o_value:
return False
elif isinstance(other, dict):
if sorted(field_names(self)) != sorted(other.keys()):
return False
for field in self._meta.user_fields:
s_value, o_value = self[field], other[field]
if s_value is not o_value and s_value != o_value:
return False
else: # tuple
if len(self) != len(other):
return False
for s_value, o_value in zip(self, other):
if s_value is not o_value and s_value != o_value:
return False
return True
def __exit__(self, *args):
if args == (None, None, None):
self._commit_flux()
else:
self._rollback_flux()
def __iter__(self):
return (self[field] for field in self._meta.user_fields)
def __getattr__(self, name):
if name[0:2] == '__' and name[-2:] == '__':
raise AttributeError('Method %s is not implemented.' % name)
if not name in self._meta.fields:
raise FieldMissingError(name)
if name in self._memos:
return self._memos[name]
try:
index = self._meta.fields.index(name)
value = self._retrieve_field_value(index, name)
return value
except DbfError:
error = sys.exc_info()[1]
error.message = "field --%s-- is %s -> %s" % (name, self._meta.fieldtypes[fielddef['type']]['Type'], error.message)
raise
def __getitem__(self, item):
if isinstance(item, baseinteger):
fields = self._meta.user_fields
field_count = len(fields)
if not -field_count <= item < field_count:
raise NotFoundError("Field offset %d is not in record" % item)
field = fields[item]
if field in self._memos:
return self._memos[field]
return self[field]
elif isinstance(item, slice):
sequence = []
if isinstance(item.start, basestring) or isinstance(item.stop, basestring):
field_names = dbf.field_names(self)
start, stop, step = item.start, item.stop, item.step
if start not in field_names or stop not in field_names:
raise MissingFieldError("Either %r or %r (or both) are not valid field names" % (start, stop))
if step is not None and not isinstance(step, baseinteger):
raise DbfError("step value must be an int, not %r" % type(step))
start = field_names.index(start)
stop = field_names.index(stop) + 1
item = slice(start, stop, step)
for index in self._meta.fields[item]:
sequence.append(self[index])
return sequence
elif isinstance(item, basestring):
return self.__getattr__(item)
else:
raise TypeError("%r is not a field name" % item)
def __len__(self):
return self._meta.user_field_count
def __ne__(self, other):
if not isinstance(other, (Record, RecordTemplate, dict, tuple)):
return NotImplemented
return not self == other
def __setattr__(self, name, value):
if name in self.__slots__:
object.__setattr__(self, name, value)
return
if self._meta.status != READ_WRITE:
raise DbfError("%s not in read/write mode" % self._meta.filename)
elif self._write_to_disk:
raise DbfError("unable to modify fields individually except in `with` or `Process()`")
elif not name in self._meta.fields:
raise FieldMissingError(name)
if name in self._meta.memofields:
self._memos[name] = value
self._dirty = True
return
index = self._meta.fields.index(name)
try:
self._update_field_value(index, name, value)
except DbfError:
error = sys.exc_info()[1]
fielddef = self._meta[name]
message = "%s (%s) = %r --> %s" % (name, self._meta.fieldtypes[fielddef[TYPE]]['Type'], value, error.args)
data = name
err_cls = error.__class__
raise err_cls(message, data)
def __setitem__(self, name, value):
if self._meta.status != READ_WRITE:
raise DbfError("%s not in read/write mode" % self._meta.filename)
if self._write_to_disk:
raise DbfError("unable to modify fields individually except in `with` or `Process()`")
if isinstance(name, basestring):
self.__setattr__(name, value)
elif isinstance(name, baseinteger):
self.__setattr__(self._meta.fields[name], value)
elif isinstance(name, slice):
sequence = []
field_names = dbf.field_names(self)
if isinstance(name.start, basestring) or isinstance(name.stop, basestring):
start, stop, step = name.start, name.stop, name.step
if start not in field_names or stop not in field_names:
raise MissingFieldError("Either %r or %r (or both) are not valid field names" % (start, stop))
if step is not None and not isinstance(step, baseinteger):
raise DbfError("step value must be an int, not %r" % type(step))
start = field_names.index(start)
stop = field_names.index(stop) + 1
name = slice(start, stop, step)
for field in self._meta.fields[name]:
sequence.append(field)
if len(sequence) != len(value):
raise DbfError("length of slices not equal")
for field, val in zip(sequence, value):
self[field] = val
else:
raise TypeError("%s is not a field name" % name)
def __str__(self):
result = []
for seq, field in enumerate(field_names(self)):
result.append("%3d - %-10s: %r" % (seq, field, self[field]))
return '\n'.join(result)
def __repr__(self):
return self._data.tobytes().decode('latin1')
def _commit_flux(self):
"""
stores field updates to disk; if any errors restores previous contents and propogates exception
"""
if self._write_to_disk:
raise DbfError("record not in flux")
try:
self._write()
except Exception:
exc = sys.exc_info()[1]
self._data[:] = self._old_data
self._update_disk(data=self._old_data)
raise DbfError("unable to write updates to disk, original data restored: %r" % (exc,)) from None
self._memos.clear()
self._old_data = None
self._write_to_disk = True
self._reindex_record()
@classmethod
def _create_blank_data(cls, layout):
"""
creates a blank record data chunk
"""
record = object.__new__(cls)
record._dirty = False
record._recnum = -1
record._meta = layout
record._data = array('B', b' ' * layout.header.record_length)
layout.memofields = []
signature = [layout.table().codepage.name]
for index, name in enumerate(layout.fields):
if name == '_nullflags':
record._data[layout['_nullflags'][START]:layout['_nullflags'][END]] = array('B', [0] * layout['_nullflags'][LENGTH])
for index, name in enumerate(layout.fields):
signature.append(name)
if name != '_nullflags':
type = FieldType(layout[name][TYPE])
start = layout[name][START]
size = layout[name][LENGTH]
end = layout[name][END]
blank = layout.fieldtypes[type]['Blank']
record._data[start:end] = array('B', blank(size))
if layout[name][TYPE] in layout.memo_types:
layout.memofields.append(name)
decimals = layout[name][DECIMALS]
signature[-1] = '_'.join([str(x) for x in (signature[-1], type.symbol, size, decimals)])
layout.blankrecord = record._data[:]
data_types = []
for fieldtype, defs in sorted(layout.fieldtypes.items()):
if fieldtype != _NULLFLAG: # ignore the nullflags field
data_types.append("%s_%s_%s" % (fieldtype.symbol, defs['Empty'], defs['Class']))
layout.record_sig = ('___'.join(signature), '___'.join(data_types))
def _reindex_record(self):
"""
rerun all indices with this record
"""
if self._meta.status == CLOSED:
raise DbfError("%s is closed; cannot alter indices" % self._meta.filename)
elif not self._write_to_disk:
raise DbfError("unable to reindex record until it is written to disk")
for dbfindex in self._meta.table()._indexen:
dbfindex(self)
def _retrieve_field_value(self, index, name):
"""
calls appropriate routine to convert value stored in field from array
"""
fielddef = self._meta[name]
flags = fielddef[FLAGS]
nullable = flags & NULLABLE and '_nullflags' in self._meta
binary = flags & BINARY
if nullable:
byte, bit = divmod(index, 8)
null_def = self._meta['_nullflags']
null_data = self._data[null_def[START]:null_def[END]]
try:
if null_data[byte] >> bit & 1:
return Null
except IndexError:
print(null_data)
print(index)
print(byte, bit)
print(len(self._data), self._data)
print(null_def)
print(null_data)
raise
record_data = self._data[fielddef[START]:fielddef[END]]
field_type = fielddef[TYPE]
retrieve = self._meta.fieldtypes[field_type]['Retrieve']
datum = retrieve(record_data, fielddef, self._meta.memo, self._meta.decoder)
return datum
def _rollback_flux(self):
"""
discards all changes since ._start_flux()
"""
if self._write_to_disk:
raise DbfError("record not in flux")
self._data = self._old_data
self._old_data = None
self._memos.clear()
self._write_to_disk = True
self._write()
def _start_flux(self):
"""
Allows record.field_name = ... and record[...] = ...; must use ._commit_flux() to commit changes
"""
if self._meta.status == CLOSED:
raise DbfError("%s is closed; cannot modify record" % self._meta.filename)
elif self._recnum < 0:
raise DbfError("record has been packed; unable to update")
elif not self._write_to_disk:
raise DbfError("record already in a state of flux")
self._old_data = self._data[:]
self._write_to_disk = False
def _update_field_value(self, index, name, value):
"""
calls appropriate routine to convert value to bytes, and save it in record
"""
fielddef = self._meta[name]
field_type = fielddef[TYPE]
flags = fielddef[FLAGS]
binary = flags & BINARY
nullable = flags & NULLABLE and '_nullflags' in self._meta
update = self._meta.fieldtypes[field_type]['Update']
if nullable:
byte, bit = divmod(index, 8)
null_def = self._meta['_nullflags']
null_data = self._data[null_def[START]:null_def[END]]
if value is Null:
null_data[byte] |= 1 << bit
value = None
else:
null_data[byte] &= 0xff ^ 1 << bit
self._data[null_def[START]:null_def[END]] = null_data
if value is not Null:
bytes = array('B', update(value, fielddef, self._meta.memo, self._meta.input_decoder, self._meta.encoder))
size = fielddef[LENGTH]
if len(bytes) > size:
raise DataOverflowError("tried to store %d bytes in %d byte field" % (len(bytes), size))
blank = array('B', b' ' * size)
start = fielddef[START]
end = start + size
blank[:len(bytes)] = bytes[:]
self._data[start:end] = blank[:]
self._dirty = True
def _update_disk(self, location='', data=None):
layout = self._meta
if self._recnum < 0:
raise DbfError("cannot update a packed record")
if layout.location == ON_DISK:
header = layout.header
if location == '':
location = self._recnum * header.record_length + header.start
if data is None:
data = self._data
layout.dfd.seek(location)
layout.dfd.write(data)
self._dirty = False
table = layout.table()
if table is not None: # is None when table is being destroyed
for index in table._indexen:
index(self)
def _write(self):
for field, value in self._memos.items():
index = self._meta.fields.index(field)
self._update_field_value(index, field, value)
self._update_disk()
class RecordTemplate(object):
"""
Provides routines to mimic a dbf record.
"""
__slots__ = ('_meta', '_data', '_old_data', '_memos', '_write_to_disk', '__weakref__')
def _commit_flux(self):
"""
Flushes field updates to disk
If any errors restores previous contents and raises `DbfError`
"""
if self._write_to_disk:
raise DbfError("record not in flux")
self._memos.clear()
self._old_data = None
self._write_to_disk = True
def _retrieve_field_value(self, index, name):
"""
Calls appropriate routine to convert value stored in field from
array
"""
fielddef = self._meta[name]
flags = fielddef[FLAGS]
nullable = flags & NULLABLE and '_nullflags' in self._meta
binary = flags & BINARY
if nullable:
byte, bit = divmod(index, 8)
null_def = self._meta['_nullflags']
null_data = self._data[null_def[START]:null_def[END]]
if null_data[byte] >> bit & 1:
return Null
record_data = self._data[fielddef[START]:fielddef[END]]
field_type = fielddef[TYPE]
retrieve = self._meta.fieldtypes[field_type]['Retrieve']
datum = retrieve(record_data, fielddef, self._meta.memo, self._meta.decoder)
return datum
def _rollback_flux(self):
"""
discards all changes since ._start_flux()
"""
if self._write_to_disk:
raise DbfError("template not in flux")
self._data = self._old_data
self._old_data = None
self._memos.clear()
self._write_to_disk = True
def _start_flux(self):
"""
Allows record.field_name = ... and record[...] = ...; must use ._commit_flux() to commit changes
"""
if not self._write_to_disk:
raise DbfError("template already in a state of flux")
self._old_data = self._data[:]
self._write_to_disk = False
def _update_field_value(self, index, name, value):
"""
calls appropriate routine to convert value to ascii bytes, and save it in record
"""
fielddef = self._meta[name]
field_type = fielddef[TYPE]
flags = fielddef[FLAGS]
binary = flags & BINARY
nullable = flags & NULLABLE and '_nullflags' in self._meta
update = self._meta.fieldtypes[field_type]['Update']
if nullable:
byte, bit = divmod(index, 8)
null_def = self._meta['_nullflags']
null_data = self._data[null_def[START]:null_def[END]] #.tostring()
# null_data = [ord(c) for c in null_data]
if value is Null:
null_data[byte] |= 1 << bit
value = None
else:
null_data[byte] &= 0xff ^ 1 << bit
# null_data = array('B', [chr(n) for n in null_data])
self._data[null_def[START]:null_def[END]] = null_data
if value is not Null:
bytes = array('B', update(value, fielddef, self._meta.memo, self._meta.input_decoder, self._meta.encoder))
size = fielddef[LENGTH]
if len(bytes) > size:
raise DataOverflowError("tried to store %d bytes in %d byte field" % (len(bytes), size))
blank = array('B', b' ' * size)
start = fielddef[START]
end = start + size
blank[:len(bytes)] = bytes[:]
self._data[start:end] = blank[:]
def __new__(cls, layout, original_record=None, defaults=None):
"""
record = ascii array of entire record; layout=record specification
"""
sig = layout.record_sig
if sig not in _Template_Records:
table = layout.table()
_Template_Records[sig] = table.new(
':%s:' % layout.filename,
default_data_types=table._meta._default_data_types,
field_data_types=table._meta._field_data_types, on_disk=False
)._meta
layout = _Template_Records[sig]
record = object.__new__(cls)
record._write_to_disk = True
record._meta = layout
record._memos = {}
for name in layout.memofields:
field_type = layout[name][TYPE]
record._memos[name] = layout.fieldtypes[field_type]['Empty']()
header = layout.header
if original_record is None:
record._data = layout.blankrecord[:]
else:
record._data = original_record._data[:]
for name in layout.memofields:
record._memos[name] = original_record[name]
for field in field_names(defaults or {}):
record[field] = defaults[field]
record._old_data = record._data[:]
return record
def __contains__(self, key):
return key in self._meta.user_fields
def __eq__(self, other):
if not isinstance(other, (Record, RecordTemplate, dict, tuple)):
return NotImplemented
if isinstance(other, (Record, RecordTemplate)):
if field_names(self) != field_names(other):
return False
for field in self._meta.user_fields:
s_value, o_value = self[field], other[field]
if s_value is not o_value and s_value != o_value:
return False
elif isinstance(other, dict):
if sorted(field_names(self)) != sorted(other.keys()):
return False
for field in self._meta.user_fields:
s_value, o_value = self[field], other[field]
if s_value is not o_value and s_value != o_value:
return False
else: # tuple
if len(self) != len(other):
return False
for s_value, o_value in zip(self, other):
if s_value is not o_value and s_value != o_value:
return False
return True
def __iter__(self):
return (self[field] for field in self._meta.user_fields)
def __getattr__(self, name):
if name[0:2] == '__' and name[-2:] == '__':
raise AttributeError('Method %s is not implemented.' % name)
if not name in self._meta.fields:
raise FieldMissingError(name)
if name in self._memos:
return self._memos[name]
try:
index = self._meta.fields.index(name)
value = self._retrieve_field_value(index, name)
return value
except DbfError:
error = sys.exc_info()[1]
error.message = "field --%s-- is %s -> %s" % (name, self._meta.fieldtypes[fielddef['type']]['Type'], error.message)
raise
def __getitem__(self, item):
fields = self._meta.user_fields
if isinstance(item, baseinteger):
field_count = len(fields)
if not -field_count <= item < field_count:
raise NotFoundError("Field offset %d is not in record" % item)
field = fields[item]
if field in self._memos:
return self._memos[field]
return self[field]
elif isinstance(item, slice):
sequence = []
if isinstance(item.start, basestring) or isinstance(item.stop, basestring):
start, stop, step = item.start, item.stop, item.step
if start not in fields or stop not in fields:
raise MissingFieldError("Either %r or %r (or both) are not valid field names" % (start, stop))
if step is not None and not isinstance(step, baseinteger):
raise DbfError("step value must be an int, not %r" % type(step))
start = fields.index(start)
stop = fields.index(stop) + 1
item = slice(start, stop, step)
for index in self._meta.fields[item]:
sequence.append(self[index])
return sequence
elif isinstance(item, basestring):
return self.__getattr__(item)
else:
raise TypeError("%r is not a field name" % item)
def __len__(self):
return self._meta.user_field_count
def __ne__(self, other):
if not isinstance(other, (Record, RecordTemplate, dict, tuple)):
return NotImplemented
return not self == other
def __setattr__(self, name, value):
if name in self.__slots__:
object.__setattr__(self, name, value)
return
if not name in self._meta.fields:
raise FieldMissingError(name)
if name in self._meta.memofields:
self._memos[name] = value
return
index = self._meta.fields.index(name)
try:
self._update_field_value(index, name, value)
except DbfError:
error = sys.exc_info()[1]
fielddef = self._meta[name]
message = "%s (%s) = %r --> %s" % (name, self._meta.fieldtypes[fielddef[TYPE]]['Type'], value, error.message)
data = name
err_cls = error.__class__
raise err_cls(message, data) from None
def __setitem__(self, name, value):
if isinstance(name, basestring):
self.__setattr__(name, value)
elif isinstance(name, baseinteger):
self.__setattr__(self._meta.fields[name], value)
elif isinstance(name, slice):
sequence = []
field_names = dbf.field_names(self)
if isinstance(name.start, basestring) or isinstance(name.stop, basestring):
start, stop, step = name.start, name.stop, name.step
if start not in field_names or stop not in field_names:
raise MissingFieldError("Either %r or %r (or both) are not valid field names" % (start, stop))
if step is not None and not isinstance(step, baseinteger):
raise DbfError("step value must be an int, not %r" % type(step))
start = field_names.index(start)
stop = field_names.index(stop) + 1
name = slice(start, stop, step)
for field in self._meta.fields[name]:
sequence.append(field)
if len(sequence) != len(value):
raise DbfError("length of slices not equal")
for field, val in zip(sequence, value):
self[field] = val
else:
raise TypeError("%s is not a field name" % name)
def __repr__(self):
return self._data.tobytes()
def __str__(self):
result = []
for seq, field in enumerate(field_names(self)):
result.append("%3d - %-10s: %r" % (seq, field, self[field]))
return '\n'.join(result)
class RecordVaporWare(object):
"""
Provides routines to mimic a dbf record, but all values are non-existent.
"""
__slots__ = ('_recno', '_sequence')
def __new__(cls, position, sequence):
"""
record = ascii array of entire record
layout=record specification
memo = memo object for table
"""
if position not in ('bof', 'eof'):
raise ValueError("position should be 'bof' or 'eof', not %r" % position)
vapor = object.__new__(cls)
vapor._recno = (-1, None)[position == 'eof']
vapor._sequence = sequence
return vapor
def __contains__(self, key):
return False
def __eq__(self, other):
if not isinstance(other, (Record, RecordTemplate, RecordVaporWare, dict, tuple)):
return NotImplemented
return False
def __getattr__(self, name):
if name[0:2] == '__' and name[-2:] == '__':
raise AttributeError('Method %s is not implemented.' % name)
else:
return Vapor
def __getitem__(self, item):
if isinstance(item, baseinteger):
return Vapor
elif isinstance(item, slice):
raise TypeError('slice notation not allowed on Vapor records')
elif isinstance(item, basestring):
return self.__getattr__(item)
else:
raise TypeError("%r is not a field name" % item)
def __len__(self):
raise TypeError("Vapor records have no length")
def __ne__(self, other):
if not isinstance(other, (Record, RecordTemplate, RecordVaporWare, dict, tuple)):
return NotImplemented
return True
def __bool__(self):
"""
Vapor records are always False
"""
return False
def __setattr__(self, name, value):
if name in self.__slots__:
object.__setattr__(self, name, value)
return
raise TypeError("cannot change Vapor record")
def __setitem__(self, name, value):
if isinstance(name, (basestring, baseinteger)):
raise TypeError("cannot change Vapor record")
elif isinstance(name, slice):
raise TypeError("slice notation not allowed on Vapor records")
else:
raise TypeError("%s is not a field name" % name)
def __repr__(self):
return "RecordVaporWare(position=%r, sequence=%r)" % (('bof', 'eof')[recno(self) is None], self._sequence)
def __str__(self):
return 'VaporRecord(%r)' % recno(self)
@property
def _recnum(self):
if self._recno is None:
return len(self._sequence)
else:
return self._recno
class _DbfMemo(object):
"""
Provides access to memo fields as dictionaries
Must override _init, _get_memo, and _put_memo to
store memo contents to disk
"""
def _init(self):
"""
Initialize disk file usage
"""
def _get_memo(self, block):
"""
Retrieve memo contents from disk
"""
def _put_memo(self, data):
"""
Store memo contents to disk
"""
def _zap(self):
"""
Resets memo structure back to zero memos
"""
self.memory.clear()
self.nextmemo = 1
def __init__(self, meta):
self.meta = meta
self.memory = {}
self.nextmemo = 1
self._init()
self.meta.newmemofile = False
def get_memo(self, block):
"""
Gets the memo in block
"""
if self.meta.ignorememos or not block:
return ''
if self.meta.location == ON_DISK:
return self._get_memo(block)
else:
return self.memory[block]
def put_memo(self, data):
"""
Stores data in memo file, returns block number
"""
if self.meta.ignorememos or data == '':
return 0
if self.meta.location == IN_MEMORY:
thismemo = self.nextmemo
self.nextmemo += 1
self.memory[thismemo] = data
else:
thismemo = self._put_memo(data)
return thismemo
class _Db3Memo(_DbfMemo):
"""
dBase III specific
"""
def _init(self):
self.meta.memo_size= 512
self.record_header_length = 2
if self.meta.location == ON_DISK and not self.meta.ignorememos:
if self.meta.newmemofile:
self.meta.mfd = open(self.meta.memoname, 'w+b')
self.meta.mfd.write(pack_long_int(1) + b'\x00' * 508)
else:
try:
self.meta.mfd = open(self.meta.memoname, 'r+b')
self.meta.mfd.seek(0)
next = self.meta.mfd.read(4)
self.nextmemo = unpack_long_int(next)
except Exception:
exc = sys.exc_info()[1]
raise DbfError("memo file appears to be corrupt: %r" % exc.args) from None
def _get_memo(self, block):
block = int(block)
self.meta.mfd.seek(block * self.meta.memo_size)
eom = -1
data = b''
while eom == -1:
newdata = self.meta.mfd.read(self.meta.memo_size)
if not newdata:
return data
data += newdata
eom = data.find(b'\x1a\x1a')
return data[:eom]
def _put_memo(self, data):
data = data
length = len(data) + self.record_header_length # room for two ^Z at end of memo
blocks = length // self.meta.memo_size
if length % self.meta.memo_size:
blocks += 1
thismemo = self.nextmemo
self.nextmemo = thismemo + blocks
self.meta.mfd.seek(0)
self.meta.mfd.write(pack_long_int(self.nextmemo))
self.meta.mfd.seek(thismemo * self.meta.memo_size)
self.meta.mfd.write(data)
self.meta.mfd.write(b'\x1a\x1a')
double_check = self._get_memo(thismemo)
if len(double_check) != len(data):
uhoh = open('dbf_memo_dump.err', 'wb')
uhoh.write('thismemo: %d' % thismemo)
uhoh.write('nextmemo: %d' % self.nextmemo)
uhoh.write('saved: %d bytes' % len(data))
uhoh.write(data)
uhoh.write('retrieved: %d bytes' % len(double_check))
uhoh.write(double_check)
uhoh.close()
raise DbfError("unknown error: memo not saved")
return thismemo
def _zap(self):
if self.meta.location == ON_DISK and not self.meta.ignorememos:
mfd = self.meta.mfd
mfd.seek(0)
mfd.truncate(0)
mfd.write(pack_long_int(1) + b'\x00' * 508)
mfd.flush()
class _VfpMemo(_DbfMemo):
"""
Visual Foxpro 6 specific
"""
def _init(self):
if self.meta.location == ON_DISK and not self.meta.ignorememos:
self.record_header_length = 8
if self.meta.newmemofile:
if self.meta.memo_size == 0:
self.meta.memo_size = 1
elif 1 < self.meta.memo_size < 33:
self.meta.memo_size *= 512
self.meta.mfd = open(self.meta.memoname, 'w+b')
nextmemo = 512 // self.meta.memo_size
if nextmemo * self.meta.memo_size < 512:
nextmemo += 1
self.nextmemo = nextmemo
self.meta.mfd.write(pack_long_int(nextmemo, bigendian=True) + b'\x00\x00' + \
pack_short_int(self.meta.memo_size, bigendian=True) + b'\x00' * 504)
else:
try:
self.meta.mfd = open(self.meta.memoname, 'r+b')
self.meta.mfd.seek(0)
header = self.meta.mfd.read(512)
self.nextmemo = unpack_long_int(header[:4], bigendian=True)
self.meta.memo_size = unpack_short_int(header[6:8], bigendian=True)
except Exception:
exc = sys.exc_info()[1]
raise DbfError("memo file appears to be corrupt: %r" % exc.args) from None
def _get_memo(self, block):
self.meta.mfd.seek(block * self.meta.memo_size)
header = self.meta.mfd.read(8)
length = unpack_long_int(header[4:], bigendian=True)
return self.meta.mfd.read(length)
def _put_memo(self, data):
data = data
self.meta.mfd.seek(0)
thismemo = unpack_long_int(self.meta.mfd.read(4), bigendian=True)
self.meta.mfd.seek(0)
length = len(data) + self.record_header_length
blocks = length // self.meta.memo_size
if length % self.meta.memo_size:
blocks += 1
self.meta.mfd.write(pack_long_int(thismemo + blocks, bigendian=True))
self.meta.mfd.seek(thismemo * self.meta.memo_size)
self.meta.mfd.write(b'\x00\x00\x00\x01' + pack_long_int(len(data), bigendian=True) + data)
return thismemo
def _zap(self):
if self.meta.location == ON_DISK and not self.meta.ignorememos:
mfd = self.meta.mfd
mfd.seek(0)
mfd.truncate(0)
nextmemo = 512 // self.meta.memo_size
if nextmemo * self.meta.memo_size < 512:
nextmemo += 1
self.nextmemo = nextmemo
mfd.write(pack_long_int(nextmemo, bigendian=True) + b'\x00\x00' + \
pack_short_int(self.meta.memo_size, bigendian=True) + b'\x00' * 504)
mfd.flush()
class DbfCsv(csv.Dialect):
"""
csv format for exporting tables
"""
delimiter = ','
doublequote = True
escapechar = None
lineterminator = '\n'
quotechar = '"'
skipinitialspace = True
quoting = csv.QUOTE_NONNUMERIC
csv.register_dialect('dbf', DbfCsv)
class _DeadObject(object):
"""
used because you cannot weakref None
"""
def __bool__(self):
return False
_DeadObject = _DeadObject()
# Routines for saving, retrieving, and creating fields
VFPTIME = 1721425
def pack_short_int(value, bigendian=False):
"""
Returns a two-bye integer from the value, or raises DbfError
"""
# 256 / 65,536
if value > 65535:
raise DataOverflowError("Maximum Integer size exceeded. Possible: 65535. Attempted: %d" % value)
if bigendian:
return struct.pack('>H', value)
else:
return struct.pack('<H', value)
def pack_long_int(value, bigendian=False):
"""
Returns a four-bye integer from the value, or raises DbfError
"""
# 256 / 65,536 / 16,777,216
if value > 4294967295:
raise DataOverflowError("Maximum Integer size exceeded. Possible: 4294967295. Attempted: %d" % value)
if bigendian:
return struct.pack('>L', value)
else:
return struct.pack('<L', value)
def pack_str(string):
"""
Returns an 11 byte, upper-cased, null padded string suitable for field names;
raises DbfError if the string is bigger than 10 bytes
"""
if len(string) > 10:
raise DbfError("Maximum string size is ten characters -- %s has %d characters" % (string, len(string)))
return struct.pack('11s', string.upper())
def unpack_short_int(bytes, bigendian=False):
"""
Returns the value in the two-byte integer passed in
"""
if bigendian:
return struct.unpack('>H', bytes)[0]
else:
return struct.unpack('<H', bytes)[0]
def unpack_long_int(bytes, bigendian=False):
"""
Returns the value in the four-byte integer passed in
"""
if bigendian:
return int(struct.unpack('>L', bytes)[0])
else:
return int(struct.unpack('<L', bytes)[0])
def unpack_str(chars):
"""
Returns a normal, lower-cased string from a null-padded byte string
"""
field = struct.unpack('%ds' % len(chars), chars)[0]
name = []
for ch in field:
if ch == NULL:
break
name.append(ch)
return bytes(name).lower()
def scinot(value, decimals):
"""
return scientific notation with not more than decimals-1 decimal places
"""
value = str(value)
sign = ''
if value[0] in ('+-'):
sign = value[0]
if sign == '+':
sign = ''
value = value[1:]
if 'e' in value: #7.8e-05
e = value.find('e')
if e - 1 <= decimals:
return sign + value
integer, mantissa, power = value[0], value[1:e], value[e+1:]
mantissa = mantissa[:decimals]
value = sign + integer + mantissa + 'e' + power
return value
integer, mantissa = value[0], value[1:]
if integer == '0':
for e, integer in enumerate(mantissa):
if integer not in ('.0'):
break
mantissa = '.' + mantissa[e+1:]
mantissa = mantissa[:decimals]
value = sign + integer + mantissa + 'e-%03d' % e
return value
e = mantissa.find('.')
mantissa = '.' + mantissa.replace('.','')
mantissa = mantissa[:decimals]
value = sign + integer + mantissa + 'e+%03d' % e
return value
def unsupported_type(something, *ignore):
"""
called if a data type is not supported for that style of table
"""
return something
def retrieve_character(bytes, fielddef, memo, decoder):
"""
Returns the string in bytes as fielddef[CLASS] or fielddef[EMPTY]
"""
data = bytes.tobytes()
if fielddef[FLAGS] & BINARY:
return data
data = fielddef[CLASS](decoder(data)[0])
if not data.strip():
cls = fielddef[EMPTY]
if cls is NoneType:
return None
return cls(data)
return data
def update_character(string, fielddef, memo, decoder, encoder):
"""
returns the string as bytes (not unicode) as fielddef[CLASS] or fielddef[EMPTY]
"""
length = fielddef[LENGTH]
if string == None:
return length * b' '
if fielddef[FLAGS] & BINARY:
if not isinstance(string, bytes):
raise ValueError('binary field: %r not in bytes format' % string)
return string
else:
if not isinstance(string, basestring):
raise ValueError("unable to coerce %r(%r) to string" % (type(string), string))
string = encoder(string.strip())[0]
return string
def retrieve_currency(bytes, fielddef, *ignore):
"""
Returns the currency value in bytes
"""
value = struct.unpack('<q', bytes)[0]
return fielddef[CLASS](("%de-4" % value).strip())
def update_currency(value, *ignore):
"""
Returns the value to be stored in the record's disk data
"""
if value == None:
value = 0
currency = int(value * 10000)
if not -9223372036854775808 < currency < 9223372036854775808:
raise DataOverflowError("value %s is out of bounds" % value)
return struct.pack('<q', currency)
def retrieve_date(bytes, fielddef, *ignore):
"""
Returns the ascii coded date as fielddef[CLASS] or fielddef[EMPTY]
"""
text = bytes.tobytes()
if text == b' ':
cls = fielddef[EMPTY]
if cls is NoneType:
return None
return cls()
year = int(text[0:4])
month = int(text[4:6])
day = int(text[6:8])
return fielddef[CLASS](year, month, day)
def update_date(moment, *ignore):
"""
Returns the Date or datetime.date object ascii-encoded (yyyymmdd)
"""
if moment == None:
return b' '
return ("%04d%02d%02d" % moment.timetuple()[:3]).encode('ascii')
def retrieve_double(bytes, fielddef, *ignore):
"""
Returns the double in bytes as fielddef[CLASS] ('default' == float)
"""
typ = fielddef[CLASS]
if typ == 'default':
typ = float
return typ(struct.unpack('<d', bytes)[0])
def update_double(value, *ignore):
"""
returns the value to be stored in the record's disk data
"""
if value == None:
value = 0
return struct.pack('<d', float(value))
def retrieve_integer(bytes, fielddef, *ignore):
"""
Returns the binary number stored in bytes in little-endian
format as fielddef[CLASS]
"""
typ = fielddef[CLASS]
if typ == 'default':
typ = int
return typ(struct.unpack('<i', bytes)[0])
def update_integer(value, *ignore):
"""
Returns value in little-endian binary format
"""
if value == None:
value = 0
try:
value = int(value)
except Exception:
raise DbfError("incompatible type: %s(%s)" % (type(value), value)) from None
if not -2147483648 < value < 2147483647:
raise DataOverflowError("Integer size exceeded. Possible: -2,147,483,648..+2,147,483,647. Attempted: %d" % value)
return struct.pack('<i', int(value))
def retrieve_logical(bytes, fielddef, *ignore):
"""
Returns True if bytes is 't', 'T', 'y', or 'Y'
None if '?'
False otherwise
"""
cls = fielddef[CLASS]
empty = fielddef[EMPTY]
bytes = bytes.tobytes()
if bytes in b'tTyY':
return cls(True)
elif bytes in b'fFnN':
return cls(False)
elif bytes in b'? ':
if empty is NoneType:
return None
return empty()
elif LOGICAL_BAD_IS_NONE:
return None
else:
raise BadDataError('Logical field contained %r' % bytes)
return typ(bytes)
def update_logical(data, *ignore):
"""
Returns 'T' if logical is True, 'F' if False, '?' otherwise
"""
if data is Unknown or data is None or data is Null or data is Other:
return b'?'
if data == True:
return b'T'
if data == False:
return b'F'
raise ValueError("unable to automatically coerce %r to Logical" % data)
def retrieve_memo(bytes, fielddef, memo, decoder):
"""
Returns the block of data from a memo file
"""
stringval = bytes.tobytes().strip()
if not stringval or memo is None:
cls = fielddef[EMPTY]
if cls is NoneType:
return None
return cls()
block = int(stringval)
data = memo.get_memo(block)
if fielddef[FLAGS] & BINARY:
return data
return fielddef[CLASS](decoder(data)[0])
def update_memo(string, fielddef, memo, decoder, encoder):
"""
Writes string as a memo, returns the block number it was saved into
"""
if memo is None:
raise DbfError('Memos are being ignored, unable to update')
if fielddef[FLAGS] & BINARY:
if string == None:
string = b''
if not isinstance(string, bytes):
raise ValueError('binary field: %r not in bytes format' % string)
else:
if string == None:
string = ''
if not isinstance(string, basestring):
raise ValueError("unable to coerce %r(%r) to string" % (type(string), string))
string = encoder(string)[0]
block = memo.put_memo(string)
if block == 0:
block = b''
return ("%*s" % (fielddef[LENGTH], block)).encode('ascii')
def retrieve_numeric(bytes, fielddef, *ignore):
"""
Returns the number stored in bytes as integer if field spec for
decimals is 0, float otherwise
"""
string = bytes.tobytes().replace(b'\x00', b'').strip()
cls = fielddef[CLASS]
if not string or string[0:1] == b'*': # value too big to store (Visual FoxPro idiocy)
cls = fielddef[EMPTY]
if cls is NoneType:
return None
return cls()
if cls == 'default':
if fielddef[DECIMALS] == 0:
return int(string)
else:
return float(string)
else:
return cls(string)
def update_numeric(value, fielddef, *ignore):
"""
returns value as ascii representation, rounding decimal
portion as necessary
"""
if value == None:
return fielddef[LENGTH] * b' '
try:
value = float(value)
except Exception:
raise DbfError("incompatible type: %s(%s)" % (type(value), value)) from None
decimalsize = fielddef[DECIMALS]
totalsize = fielddef[LENGTH]
if decimalsize:
decimalsize += 1
maxintegersize = totalsize - decimalsize
integersize = len("%.0f" % floor(value))
if integersize > maxintegersize:
if integersize != 1:
raise DataOverflowError('Integer portion too big')
string = scinot(value, decimalsize)
if len(string) > totalsize:
raise DataOverflowError('Value representation too long for field')
return ("%*.*f" % (fielddef[LENGTH], fielddef[DECIMALS], value)).encode('ascii')
def retrieve_vfp_datetime(bytes, fielddef, *ignore):
"""
returns the date/time stored in bytes; dates <= 01/01/1981 00:00:00
may not be accurate; BC dates are nulled.
"""
# two four-byte integers store the date and time.
# millesecords are discarded from time
if bytes == array('B', [0] * 8):
cls = fielddef[EMPTY]
if cls is NoneType:
return None
return cls()
cls = fielddef[CLASS]
time = unpack_long_int(bytes[4:])
microseconds = (time % 1000) * 1000
time = time // 1000 # int(round(time, -3)) // 1000 discard milliseconds
hours = time // 3600
mins = time % 3600 // 60
secs = time % 3600 % 60
time = datetime.time(hours, mins, secs, microseconds)
possible = unpack_long_int(bytes[:4])
possible -= VFPTIME
possible = max(0, possible)
date = datetime.date.fromordinal(possible)
return cls(date.year, date.month, date.day, time.hour, time.minute, time.second, time.microsecond)
def update_vfp_datetime(moment, *ignore):
"""
Sets the date/time stored in moment
moment must have fields:
year, month, day, hour, minute, second, microsecond
"""
data = [0] * 8
if moment:
hour = moment.hour
minute = moment.minute
second = moment.second
millisecond = moment.microsecond // 1000 # convert from millionths to thousandths
time = ((hour * 3600) + (minute * 60) + second) * 1000 + millisecond
data[4:] = update_integer(time)
data[:4] = update_integer(moment.toordinal() + VFPTIME)
return bytes(data)
def retrieve_vfp_memo(bytes, fielddef, memo, decoder):
"""
Returns the block of data from a memo file
"""
if memo is None:
block = 0
else:
block = struct.unpack('<i', bytes)[0]
if not block:
cls = fielddef[EMPTY]
if cls is NoneType:
return None
return cls()
data = memo.get_memo(block)
if fielddef[FLAGS] & BINARY:
return data
return fielddef[CLASS](decoder(data)[0])
def update_vfp_memo(string, fielddef, memo, decoder, encoder):
"""
Writes string as a memo, returns the block number it was saved into
"""
if memo is None:
raise DbfError('Memos are being ignored, unable to update')
if string == None:
return struct.pack('<i', 0)
if fielddef[FLAGS] & BINARY:
# if string == None:
# string = b''
if not isinstance(string, bytes):
raise ValueError('binary field: %r not in bytes format' % string)
string = bytes(string)
else:
# if string == None:
# string = ''
if not isinstance(string, basestring):
raise ValueError("unable to coerce %r(%r) to string" % (type(string), string))
string = encoder(string)[0]
block = memo.put_memo(string)
return struct.pack('<i', block)
def add_character(format, flags):
if format[0][0] != '(' or format[0][-1] != ')' or any([f not in flags for f in format[1:]]):
raise FieldSpecError("Format for Character field creation is 'C(n)%s', not 'C%s'" % field_spec_error_text(format, flags))
length = int(format[0][1:-1])
if not 0 < length < 256:
raise FieldSpecError("Character fields must be between 1 and 255, not %d" % length)
decimals = 0
flag = 0
for f in format[1:]:
flag |= FieldFlag.lookup(f)
return length, decimals, flag
def add_date(format, flags):
if any([f not in flags for f in format]):
raise FieldSpecError("Format for Date field creation is 'D%s', not 'D%s'" % field_spec_error_text(format, flags))
length = 8
decimals = 0
flag = 0
for f in format:
flag |= FieldFlag.lookup(f)
return length, decimals, flag
def add_logical(format, flags):
if any([f not in flags for f in format]):
raise FieldSpecError("Format for Logical field creation is 'L%s', not 'L%s'" % field_spec_error_text(format, flags))
length = 1
decimals = 0
flag = 0
for f in format:
flag |= FieldFlag.lookup(f)
return length, decimals, flag
def add_memo(format, flags):
if any(f not in flags for f in format):
raise FieldSpecError("Format for Memo field creation is 'M(n)%s', not 'M%s'" % field_spec_error_text(format, flags))
length = 10
decimals = 0
flag = 0
for f in format:
flag |= FieldFlag.lookup(f)
return length, decimals, flag
def add_binary_memo(format, flags):
if any(f not in flags for f in format):
raise FieldSpecError("Format for Memo field creation is 'M(n)%s', not 'M%s'" % field_spec_error_text(format, flags))
length = 10
decimals = 0
flag = 0
for f in format:
flag |= FieldFlag.lookup(f)
flag |= FieldFlag.BINARY
return length, decimals, flag
def add_numeric(format, flags):
if len(format) > 1 or format[0][0] != '(' or format[0][-1] != ')' or any(f not in flags for f in format[1:]):
raise FieldSpecError("Format for Numeric field creation is 'N(s,d)%s', not 'N%s'" % field_spec_error_text(format, flags))
length, decimals = format[0][1:-1].split(',')
length = int(length)
decimals = int(decimals)
flag = 0
for f in format[1:]:
flag |= FieldFlag.lookup(f)
if not 0 < length < 20:
raise FieldSpecError("Numeric fields must be between 1 and 19 digits, not %d" % length)
if decimals and not 0 < decimals <= length - 2:
raise FieldSpecError("Decimals must be between 0 and Length-2 (Length: %d, Decimals: %d)" % (length, decimals))
return length, decimals, flag
def add_clp_character(format, flags):
if format[0][0] != '(' or format[0][-1] != ')' or any([f not in flags for f in format[1:]]):
raise FieldSpecError("Format for Character field creation is 'C(n)%s', not 'C%s'" % field_spec_error_text(format, flags))
length = int(format[0][1:-1])
if not 0 < length < 65519:
raise FieldSpecError("Character fields must be between 1 and 65,519")
decimals = 0
flag = 0
for f in format[1:]:
flag |= FieldFlag.lookup(f)
return length, decimals, flag
def add_vfp_character(format, flags):
if format[0][0] != '(' or format[0][-1] != ')' or any([f not in flags for f in format[1:]]):
raise FieldSpecError("Format for Character field creation is 'C(n)%s', not 'C%s'" % field_spec_error_text(format, flags))
length = int(format[0][1:-1])
if not 0 < length < 255:
raise FieldSpecError("Character fields must be between 1 and 255")
decimals = 0
flag = 0
for f in format[1:]:
flag |= FieldFlag.lookup(f)
return length, decimals, flag
def add_vfp_currency(format, flags):
if any(f not in flags for f in format[1:]):
raise FieldSpecError("Format for Currency field creation is 'Y%s', not 'Y%s'" % field_spec_error_text(format, flags))
length = 8
decimals = 0
flag = 0
for f in format:
flag |= FieldFlag.lookup(f)
return length, decimals, flag
def add_vfp_datetime(format, flags):
if any(f not in flags for f in format[1:]):
raise FieldSpecError("Format for DateTime field creation is 'T%s', not 'T%s'" % field_spec_error_text(format, flags))
length = 8
decimals = 0
flag = 0
for f in format:
flag |= FieldFlag.lookup(f)
return length, decimals, flag
def add_vfp_double(format, flags):
if any(f not in flags for f in format[1:]):
raise FieldSpecError("Format for Double field creation is 'B%s', not 'B%s'" % field_spec_error_text(format, flags))
length = 8
decimals = 0
flag = 0
for f in format:
flag |= FieldFlag.lookup(f)
return length, decimals, flag
def add_vfp_integer(format, flags):
if any(f not in flags for f in format[1:]):
raise FieldSpecError("Format for Integer field creation is 'I%s', not 'I%s'" % field_spec_error_text(format, flags))
length = 4
decimals = 0
flag = 0
for f in format:
flag |= FieldFlag.lookup(f)
return length, decimals, flag
def add_vfp_memo(format, flags):
if any(f not in flags for f in format[1:]):
raise FieldSpecError("Format for Memo field creation is 'M%s', not 'M%s'" % field_spec_error_text(format, flags))
length = 4
decimals = 0
flag = 0
for f in format:
flag |= FieldFlag.lookup(f)
if 'binary' not in flags: # general or picture -- binary is implied
flag |= FieldFlag.BINARY
return length, decimals, flag
def add_vfp_binary_memo(format, flags):
if any(f not in flags for f in format[1:]):
raise FieldSpecError("Format for Memo field creation is 'M%s', not 'M%s'" % field_spec_error_text(format, flags))
length = 4
decimals = 0
flag = 0
for f in format:
flag |= FieldFlag.lookup(f)
# general or picture -- binary is implied
flag |= FieldFlag.BINARY
return length, decimals, flag
def add_vfp_numeric(format, flags):
if format[0][0] != '(' or format[0][-1] != ')' or any(f not in flags for f in format[1:]):
raise FieldSpecError("Format for Numeric field creation is 'N(s,d)%s', not 'N%s'" % field_spec_error_text(format, flags))
length, decimals = format[0][1:-1].split(',')
length = int(length)
decimals = int(decimals)
flag = 0
for f in format[1:]:
flag |= FieldFlag.lookup(f)
if not 0 < length < 21:
raise FieldSpecError("Numeric fields must be between 1 and 20 digits, not %d" % length)
if decimals and not 0 < decimals <= length - 2:
raise FieldSpecError("Decimals must be between 0 and Length-2 (Length: %d, Decimals: %d)" % (length, decimals))
return length, decimals, flag
def field_spec_error_text(format, flags):
"""
generic routine for error text for the add...() functions
"""
flg = ''
if flags:
flg = ' [ ' + ' | '.join(flags) + ' ]'
frmt = ''
if format:
frmt = ' ' + ' '.join(format)
return flg, frmt
def ezip(*iters):
"""
extends all iters to longest one, using last value from each as necessary
"""
iters = [iter(x) for x in iters]
last = [None] * len(iters)
while "any iters have items left":
alive = len(iters)
for i, iterator in enumerate(iters):
try:
value = next(iterator)
last[i] = value
except StopIteration:
alive -= 1
if alive:
yield tuple(last)
alive = len(iters)
continue
break
# Public classes
class Tables(object):
"""
context manager for multiple tables and/or indices
"""
def __init__(yo, *tables):
if len(tables) == 1 and not isinstance(tables[0], (Table, basestring)):
tables = tables[0]
yo._tables = []
yo._entered = []
for table in tables:
if isinstance(table, basestring):
table = Table(table)
yo._tables.append(table)
def __enter__(yo):
for table in yo._tables:
table.__enter__()
yo._entered.append(table)
return tuple(yo._tables)
def __exit__(yo, *args):
while yo._entered:
table = yo._entered.pop()
try:
table.__exit__()
except Exception:
pass
class IndexLocation(int):
"""
Represents the index where the match criteria is if True,
or would be if False
Used by Index.index_search
"""
def __new__(cls, value, found):
"value is the number, found is True/False"
result = int.__new__(cls, value)
result.found = found
return result
def __bool__(self):
return self.found
class FieldInfo(tuple):
"""
tuple with named attributes for representing a field's dbf type,
length, decimal portion, and python class
"""
__slots__= ()
def __new__(cls, *args):
if len(args) != 4:
raise TypeError("%s should be called with Type, Length, Decimal size, and Class" % cls.__name__)
return tuple.__new__(cls, args)
@property
def field_type(self):
return self[0]
@property
def length(self):
return self[1]
@property
def decimal(self):
return self[2]
@property
def py_type(self):
return self[3]
class CodePage(tuple):
"""
tuple with named attributes for representing a tables codepage
"""
__slots__= ()
def __new__(cls, name):
"call with name of codepage (e.g. 'cp1252')"
code, name, desc = _codepage_lookup(name)
return tuple.__new__(cls, (name, desc, code))
def __repr__(self):
return "CodePage(%r, %r, %r)" % (self[0], self[1], self[2])
def __str__(self):
return "%s (%s)" % (self[0], self[1])
@property
def name(self):
return self[0]
@property
def desc(self):
return self[1]
@property
def code(self):
return self[2]
class Iter(_Navigation):
"""
Provides iterable behavior for a table
"""
def __init__(self, table, include_vapor=False):
"""
Return a Vapor record as the last record in the iteration
if include_vapor is True
"""
self._table = table
self._record = None
self._include_vapor = include_vapor
self._exhausted = False
def __iter__(self):
return self
def __next__(self):
while not self._exhausted:
if self._index == len(self._table):
break
if self._index >= (len(self._table) - 1):
self._index = max(self._index, len(self._table))
if self._include_vapor:
return RecordVaporWare('eof', self._table)
break
self._index += 1
record = self._table[self._index]
return record
self._exhausted = True
raise StopIteration
class Table(_Navigation):
"""
Base class for dbf style tables
"""
_version = 'basic memory table'
_versionabbr = 'dbf'
_max_fields = 255
_max_records = 4294967296
@MutableDefault
def _field_types():
return {
CHAR: {
'Type':'Character', 'Init':add_character, 'Blank':lambda x: b' ' * x, 'Retrieve':retrieve_character, 'Update':update_character,
'Class':str, 'Empty':str, 'flags':tuple(),
},
DATE: {
'Type':'Date', 'Init':add_date, 'Blank':lambda x: b' ', 'Retrieve':retrieve_date, 'Update':update_date,
'Class':datetime.date, 'Empty':none, 'flags':tuple(),
},
NUMERIC: {
'Type':'Numeric', 'Retrieve':retrieve_numeric, 'Update':update_numeric, 'Blank':lambda x: b' ' * x, 'Init':add_numeric,
'Class':'default', 'Empty':none, 'flags':tuple(),
},
LOGICAL: {
'Type':'Logical', 'Init':add_logical, 'Blank':lambda x: b'?', 'Retrieve':retrieve_logical, 'Update':update_logical,
'Class':bool, 'Empty':none, 'flags':tuple(),
},
MEMO: {
'Type':'Memo', 'Init':add_memo, 'Blank':lambda x: b' ', 'Retrieve':retrieve_memo, 'Update':update_memo,
'Class':str, 'Empty':str, 'flags':tuple(),
},
FLOAT: {
'Type':'Numeric', 'Init':add_numeric, 'Blank':lambda x: b' ' * x, 'Retrieve':retrieve_numeric, 'Update':update_numeric,
'Class':'default', 'Empty':none, 'flags':tuple(),
},
}
@MutableDefault
def _previous_status():
return []
_memoext = ''
_memoClass = _DbfMemo
_yesMemoMask = 0
_noMemoMask = 0
_binary_types = tuple() # as in non-unicode character, or non-text number
_character_types = (CHAR, DATE, FLOAT, LOGICAL, MEMO, NUMERIC) # field represented by text data
_currency_types = tuple() # money!
_date_types = (DATE, ) # dates
_datetime_types = tuple() # dates w/times
_decimal_types = (NUMERIC, FLOAT) # text-based numeric fields
_fixed_types = (MEMO, DATE, LOGICAL) # always same length in table
_logical_types = (LOGICAL, ) # logicals
_memo_types = (MEMO, )
_numeric_types = (NUMERIC, FLOAT) # fields representing a number
_variable_types = (CHAR, NUMERIC, FLOAT) # variable length in table
_dbfTableHeader = array('B', [0] * 32)
_dbfTableHeader[0] = 0 # table type - none
_dbfTableHeader[8:10] = array('B', pack_short_int(33))
_dbfTableHeader[10] = 1 # record length -- one for delete flag
_dbfTableHeader[29] = 0 # code page -- none, using plain ascii
_dbfTableHeader = _dbfTableHeader.tobytes()
_dbfTableHeaderExtra = b''
_supported_tables = ()
_pack_count = 0
backup = None
class _Indexen(object):
"""
implements the weakref structure for seperate indexes
"""
def __init__(self):
self._indexen = set()
def __iter__(self):
self._indexen = set([s for s in self._indexen if s() is not None])
return (s() for s in self._indexen if s() is not None)
def __len__(self):
self._indexen = set([s for s in self._indexen if s() is not None])
return len(self._indexen)
def add(self, new_index):
self._indexen.add(weakref.ref(new_index))
self._indexen = set([s for s in self._indexen if s() is not None])
class _MetaData(dict):
"""
Container class for storing per table metadata
"""
blankrecord = None
dfd = None # file handle
fields = None # field names
field_count = 0 # number of fields
field_types = None # dictionary of dbf type field specs
filename = None # name of .dbf file
ignorememos = False # True when memos should be ignored
memoname = None # name of .dbt/.fpt file
mfd = None # file handle
memo = None # memo object
memofields = None # field names of Memo type
newmemofile = False # True when memo file needs to be created
nulls = None # non-None when Nullable fields present
user_fields = None # not counting SYSTEM fields
user_field_count = 0 # also not counting SYSTEM fields
class _TableHeader(object):
"""
represents the data block that defines a tables type and layout
"""
def __init__(self, data, pack_date, unpack_date):
if len(data) != 32:
raise BadDataError('table header should be 32 bytes, but is %d bytes' % len(data))
self.packDate = pack_date
self.unpackDate = unpack_date
self._data = array('B', data + b'\x0d')
def codepage(self, cp=None):
"""
get/set code page of table
"""
if cp is None:
return self._data[29]
else:
cp, sd, ld = _codepage_lookup(cp)
self._data[29] = cp
return cp
@property
def data(self):
"""
main data structure
"""
date = self.packDate(Date.today())
self._data[1:4] = array('B', date)
return self._data.tobytes()
@data.setter
def data(self, bytes):
if len(bytes) < 32:
raise BadDataError("length for data of %d is less than 32" % len(bytes))
self._data[:] = array('B', bytes)
@property
def extra(self):
"extra dbf info (located after headers, before data records)"
fieldblock = self._data[32:]
for i in range(len(fieldblock) // 32 + 1):
cr = i * 32
if fieldblock[cr] == CR:
break
else:
raise BadDataError("corrupt field structure")
cr += 33 # skip past CR
return self._data[cr:].tobytes()
@extra.setter
def extra(self, data):
fieldblock = self._data[32:]
for i in range(len(fieldblock) // 32 + 1):
cr = i * 32
if fieldblock[cr] == CR:
break
else:
raise BadDataError("corrupt field structure")
cr += 33 # skip past CR
self._data[cr:] = array('B', data) # extra
self._data[8:10] = array('B', pack_short_int(len(self._data))) # start
@property
def field_count(self):
"number of fields (read-only)"
fieldblock = self._data[32:]
for i in range(len(fieldblock) // 32 + 1):
cr = i * 32
if fieldblock[cr] == CR:
break
else:
raise BadDataError("corrupt field structure")
return len(fieldblock[:cr]) // 32
@property
def fields(self):
"""
field block structure
"""
fieldblock = self._data[32:]
for i in range(len(fieldblock) // 32 + 1):
cr = i * 32
if fieldblock[cr] == CR:
break
else:
raise BadDataError("corrupt field structure")
return fieldblock[:cr].tobytes()
@fields.setter
def fields(self, block):
fieldblock = self._data[32:]
for i in range(len(fieldblock) // 32 + 1):
cr = i * 32
if fieldblock[cr] == CR:
break
else:
raise BadDataError("corrupt field structure")
cr += 32 # convert to indexing main structure
fieldlen = len(block)
if fieldlen % 32 != 0:
raise BadDataError("fields structure corrupt: %d is not a multiple of 32" % fieldlen)
self._data[32:cr] = array('B', block) # fields
self._data[8:10] = array('B', pack_short_int(len(self._data))) # start
fieldlen = fieldlen // 32
recordlen = 1 # deleted flag
for i in range(fieldlen):
recordlen += block[i*32+16]
self._data[10:12] = array('B', pack_short_int(recordlen))
@property
def record_count(self):
"""
number of records (maximum 16,777,215)
"""
return unpack_long_int(self._data[4:8].tobytes())
@record_count.setter
def record_count(self, count):
self._data[4:8] = array('B', pack_long_int(count))
@property
def record_length(self):
"""
length of a record (read_only) (max of 65,535)
"""
return unpack_short_int(self._data[10:12].tobytes())
@record_length.setter
def record_length(self, length):
"""
to support Clipper large Character fields
"""
self._data[10:12] = array('B', pack_short_int(length))
@property
def start(self):
"""
starting position of first record in file (must be within first 64K)
"""
return unpack_short_int(self._data[8:10].tobytes())
@start.setter
def start(self, pos):
self._data[8:10] = array('B', pack_short_int(pos))
@property
def update(self):
"""
date of last table modification (read-only)
"""
return self.unpackDate(self._data[1:4].tobytes())
@property
def version(self):
"""
dbf version
"""
return self._data[0]
@version.setter
def version(self, ver):
self._data[0] = ver
class _Table(object):
"""
implements the weakref table for records
"""
def __init__(self, count, meta):
self._meta = meta
self._max_count = count
self._weakref_list = {}
self._accesses = 0
self._dead_check = 1024
def __getitem__(self, index):
# maybe = self._weakref_list[index]()
if index < 0:
if self._max_count + index < 0:
raise IndexError('index %d smaller than available records' % index)
index = self._max_count + index
if index >= self._max_count:
raise IndexError('index %d greater than available records' % index)
maybe = self._weakref_list.get(index)
if maybe:
maybe = maybe()
self._accesses += 1
if self._accesses >= self._dead_check:
dead = []
for key, value in self._weakref_list.items():
if value() is None:
dead.append(key)
for key in dead:
del self._weakref_list[key]
if not maybe:
meta = self._meta
if meta.status == CLOSED:
raise DbfError("%s is closed; record %d is unavailable" % (meta.filename, index))
header = meta.header
if index < 0:
index += header.record_count
size = header.record_length
location = index * size + header.start
meta.dfd.seek(location)
if meta.dfd.tell() != location:
raise ValueError("unable to seek to offset %d in file" % location)
bytes = meta.dfd.read(size)
if not bytes:
raise ValueError("unable to read record data from %s at location %d" % (meta.filename, location))
maybe = Record(recnum=index, layout=meta, kamikaze=bytes, _fromdisk=True)
self._weakref_list[index] = weakref.ref(maybe)
return maybe
def append(self, record):
self._weakref_list[self._max_count] = weakref.ref(record)
self._max_count += 1
def clear(self):
for key in list(self._weakref_list.keys()):
del self._weakref_list[key]
self._max_count = 0
def flush(self):
for maybe in self._weakref_list.values():
maybe = maybe()
if maybe and not maybe._write_to_disk:
raise DbfError("some records have not been written to disk")
def pop(self):
if not self._max_count:
raise IndexError('no records exist')
record = self[self._max_count-1]
self._max_count -= 1
return record
def _build_header_fields(self):
"""
constructs fieldblock for disk table
"""
fieldblock = array('B', b'')
memo = False
nulls = False
meta = self._meta
header = meta.header
header.version = header.version & self._noMemoMask
meta.fields = [f for f in meta.fields if f != '_nullflags']
for field in meta.fields:
layout = meta[field]
if meta.fields.count(field) > 1:
raise BadDataError("corrupted field structure (noticed in _build_header_fields)")
fielddef = array('B', [0] * 32)
fielddef[:11] = array('B', pack_str(meta.encoder(field)[0]))
fielddef[11] = layout[TYPE]
fielddef[12:16] = array('B', pack_long_int(layout[START]))
fielddef[16] = layout[LENGTH]
fielddef[17] = layout[DECIMALS]
fielddef[18] = layout[FLAGS]
fieldblock.extend(fielddef)
if layout[TYPE] in meta.memo_types:
memo = True
if layout[FLAGS] & NULLABLE:
nulls = True
if memo:
header.version = header.version | self._yesMemoMask
if meta.memo is None:
meta.memo = self._memoClass(meta)
else:
if os.path.exists(meta.memoname):
if meta.mfd is not None:
meta.mfd.close()
os.remove(meta.memoname)
meta.memo = None
if nulls:
start = layout[START] + layout[LENGTH]
length, one_more = divmod(len(meta.fields), 8)
if one_more:
length += 1
fielddef = array('B', [0] * 32)
fielddef[:11] = array('B', pack_str(b'_nullflags'))
fielddef[11] = 0x30
fielddef[12:16] = array('B', pack_long_int(start))
fielddef[16] = length
fielddef[17] = 0
fielddef[18] = BINARY | SYSTEM
fieldblock.extend(fielddef)
meta.fields.append('_nullflags')
nullflags = (
_NULLFLAG, # type
start, # start
length, # length
start + length, # end
0, # decimals
BINARY | SYSTEM, # flags
none, # class
none, # empty
)
meta['_nullflags'] = nullflags
header.fields = fieldblock.tobytes()
meta.user_fields = [f for f in meta.fields if not meta[f][FLAGS] & SYSTEM]
meta.user_field_count = len(meta.user_fields)
Record._create_blank_data(meta)
def _check_memo_integrity(self):
"""
checks memo file for problems
"""
raise NotImplementedError("_check_memo_integrity must be implemented by subclass")
def _initialize_fields(self):
"""
builds the FieldList of names, types, and descriptions from the disk file
"""
raise NotImplementedError("_initialize_fields must be implemented by subclass")
def _field_layout(self, i):
"""
Returns field information Name Type(Length[, Decimals])
"""
name = self._meta.fields[i]
fielddef = self._meta[name]
type = FieldType(fielddef[TYPE])
length = fielddef[LENGTH]
decimals = fielddef[DECIMALS]
set_flags = fielddef[FLAGS]
flags = []
if type in (GENERAL, PICTURE):
printable_flags = NULLABLE, SYSTEM
else:
printable_flags = BINARY, NULLABLE, SYSTEM
for flg in printable_flags:
if flg & set_flags == flg:
flags.append(FieldFlag(flg))
set_flags &= 255 ^ flg
if flags:
flags = ' ' + ' '.join(f.text for f in flags)
else:
flags = ''
if type in self._fixed_types:
description = "%s %s%s" % (name, type.symbol, flags)
elif type in self._numeric_types:
description = "%s %s(%d,%d)%s" % (name, type.symbol, length, decimals, flags)
else:
description = "%s %s(%d)%s" % (name, type.symbol, length, flags)
return description
def _list_fields(self, specs, sep=','):
"""
standardizes field specs
"""
if specs is None:
specs = self.field_names
elif isinstance(specs, basestring):
specs = specs.strip(sep).split(sep)
else:
specs = list(specs)
specs = [s.strip() for s in specs]
return specs
def _nav_check(self):
"""
Raises `DbfError` if table is closed
"""
if self._meta.status == CLOSED:
raise DbfError('table %s is closed' % self.filename)
@staticmethod
def _pack_date(date):
"""
Returns a group of three bytes, in integer form, of the date
"""
# return "%c%c%c" % (date.year - 1900, date.month, date.day)
return bytes([date.year - 1900, date.month, date.day])
@staticmethod
def _unpack_date(bytestr):
"""
Returns a Date() of the packed three-byte date passed in
"""
year, month, day = struct.unpack('<BBB', bytestr)
year += 1900
return Date(year, month, day)
def _update_disk(self, headeronly=False):
"""
synchronizes the disk file with current data
"""
if self._meta.location == IN_MEMORY:
return
meta = self._meta
header = meta.header
fd = meta.dfd
fd.seek(0)
fd.write(header.data)
eof = header.start + header.record_count * header.record_length
if not headeronly:
for record in self:
record._update_disk()
fd.flush()
fd.truncate(eof)
if self._versionabbr in ('db3', 'clp'):
fd.seek(0, SEEK_END)
fd.write(b'\x1a') # required for dBase III compatibility
fd.flush()
fd.truncate(eof + 1)
def __contains__(self, data):
"""
data can be a record, template, dict, or tuple
"""
if not isinstance(data, (Record, RecordTemplate, dict, tuple)):
raise TypeError("x should be a record, template, dict, or tuple, not %r" % type(data))
for record in Iter(self):
if data == record:
return True
return False
def __enter__(self):
self._previous_status.append(self._meta.status)
self.open()
return self
def __exit__(self, *exc_info):
if self._previous_status.pop() == CLOSED:
self.close()
def __getattr__(self, name):
if name in (
'binary_types',
'character_types',
'currency_types',
'date_types',
'datetime_types',
'decimal_types',
'fixed_types',
'logical_types',
'memo_types',
'numeric_types',
'variable_types',
):
return getattr(self, '_'+name)
if name in ('_table', ):
if self._meta.location == ON_DISK:
self._table = self._Table(len(self), self._meta)
else:
self._table = []
return object.__getattribute__(self, name)
def __getitem__(self, value):
if isinstance(value, baseinteger):
if not -self._meta.header.record_count <= value < self._meta.header.record_count:
raise NotFoundError("Record %d is not in table %s." % (value, self.filename))
return self._table[value]
elif type(value) == slice:
sequence = List(desc='%s --> %s' % (self.filename, value))
for index in range(len(self))[value]:
record = self._table[index]
sequence.append(record)
return sequence
else:
raise TypeError('type <%s> not valid for indexing' % type(value))
def __init__(self, filename, field_specs=None, memo_size=128, ignore_memos=False,
codepage=None, default_data_types=None, field_data_types=None, # e.g. 'name':str, 'age':float
dbf_type=None, on_disk=True,
):
"""
open/create dbf file
filename should include path if needed
field_specs can be either a ;-delimited string or a list of strings
memo_size is always 512 for db3 memos
ignore_memos is useful if the memo file is missing or corrupt
read_only will load records into memory, then close the disk file
keep_memos will also load any memo fields into memory
meta_only will ignore all records, keeping only basic table information
codepage will override whatever is set in the table itself
"""
if not on_disk:
if field_specs is None:
raise DbfError("field list must be specified for memory tables")
self._indexen = self._Indexen()
self._meta = meta = self._MetaData()
meta.max_fields = self._max_fields
meta.max_records = self._max_records
meta.table = weakref.ref(self)
meta.filename = filename
meta.fields = []
meta.user_fields = []
meta.user_field_count = 0
meta.fieldtypes = fieldtypes = self._field_types
meta.fixed_types = self._fixed_types
meta.variable_types = self._variable_types
meta.character_types = self._character_types
meta.currency_types = self._currency_types
meta.decimal_types = self._decimal_types
meta.numeric_types = self._numeric_types
meta.memo_types = self._memo_types
meta.ignorememos = meta.original_ignorememos = ignore_memos
meta.memo_size = memo_size
meta.input_decoder = codecs.getdecoder(input_decoding) # from ascii to unicode
meta.output_encoder = codecs.getencoder(input_decoding) # and back to ascii
meta.header = header = self._TableHeader(self._dbfTableHeader, self._pack_date, self._unpack_date)
header.extra = self._dbfTableHeaderExtra
if default_data_types is None:
default_data_types = dict()
elif default_data_types == 'enhanced':
default_data_types = {
'C' : dbf.Char,
'L' : dbf.Logical,
'D' : dbf.Date,
'T' : dbf.DateTime,
}
self._meta._default_data_types = default_data_types
if field_data_types is None:
field_data_types = dict()
self._meta._field_data_types = field_data_types
for field, types in default_data_types.items():
field = FieldType(field)
if not isinstance(types, tuple):
types = (types, )
for result_name, result_type in ezip(('Class', 'Empty', 'Null'), types):
fieldtypes[field][result_name] = result_type
if not on_disk:
self._table = []
meta.location = IN_MEMORY
meta.memoname = filename
meta.header.data
else:
base, ext = os.path.splitext(filename)
if ext.lower() != '.dbf':
meta.filename = filename + '.dbf'
searchname = filename + '.[Db][Bb][Ff]'
else:
meta.filename = filename
searchname = filename
matches = glob(searchname)
if len(matches) == 1:
meta.filename = matches[0]
elif matches:
raise DbfError("please specify exactly which of %r you want" % (matches, ))
case = [('l','u')[c.isupper()] for c in meta.filename[-4:]]
if case == ['l','l','l','l']:
meta.memoname = base + self._memoext.lower()
elif case == ['l','u','u','u']:
meta.memoname = base + self._memoext.upper()
else:
meta.memoname = base + ''.join([c.lower() if case[i] == 'l' else c.upper() for i, c in enumerate(self._memoext)])
meta.location = ON_DISK
if codepage is not None:
header.codepage(codepage)
cp, sd, ld = _codepage_lookup(codepage)
self._meta.decoder = codecs.getdecoder(sd)
self._meta.encoder = codecs.getencoder(sd)
if field_specs:
if meta.location == ON_DISK:
meta.dfd = open(meta.filename, 'w+b')
meta.newmemofile = True
if codepage is None:
header.codepage(default_codepage)
cp, sd, ld = _codepage_lookup(header.codepage())
meta.decoder = codecs.getdecoder(sd)
meta.encoder = codecs.getencoder(sd)
meta.status = READ_WRITE
self.add_fields(field_specs)
else:
try:
dfd = meta.dfd = open(meta.filename, 'r+b')
except IOError:
e= sys.exc_info()[1]
raise DbfError(str(e)) from None
dfd.seek(0)
meta.header = header = self._TableHeader(dfd.read(32), self._pack_date, self._unpack_date)
if not header.version in self._supported_tables:
dfd.close()
dfd = None
raise DbfError(
"%s does not support %s [%x]" %
(self._version,
version_map.get(header.version, 'Unknown: %s' % header.version),
header.version))
if codepage is None:
cp, sd, ld = _codepage_lookup(header.codepage())
self._meta.decoder = codecs.getdecoder(sd)
self._meta.encoder = codecs.getencoder(sd)
fieldblock = dfd.read(header.start - 32)
for i in range(len(fieldblock) // 32 + 1):
fieldend = i * 32
if fieldblock[fieldend] == CR:
break
else:
raise BadDataError("corrupt field structure in header")
if len(fieldblock[:fieldend]) % 32 != 0:
raise BadDataError("corrupt field structure in header")
old_length = header.data[10:12]
header.fields = fieldblock[:fieldend]
header.data = header.data[:10] + old_length + header.data[12:] # restore original for testing
header.extra = fieldblock[fieldend + 1:] # skip trailing \r
self._initialize_fields()
self._check_memo_integrity()
dfd.seek(0)
for field in meta.fields:
field_type = meta[field][TYPE]
default_field_type = (
fieldtypes[field_type]['Class'],
fieldtypes[field_type]['Empty'],
)
specific_field_type = field_data_types.get(field)
if specific_field_type is not None and not isinstance(specific_field_type, tuple):
specific_field_type = (specific_field_type, )
classes = []
for result_name, result_type in ezip(
('class', 'empty'),
specific_field_type or default_field_type,
):
classes.append(result_type)
meta[field] = meta[field][:-2] + tuple(classes)
meta.status = READ_ONLY
self.close()
def __iter__(self):
"""
iterates over the table's records
"""
return Iter(self)
def __len__(self):
"""
returns number of records in table
"""
return self._meta.header.record_count
def __new__(cls, filename, field_specs=None, memo_size=128, ignore_memos=False,
codepage=None, default_data_types=None, field_data_types=None, # e.g. 'name':str, 'age':float
dbf_type=None, on_disk=True,
):
if dbf_type is None and isinstance(filename, Table):
return filename
if field_specs and dbf_type is None:
dbf_type = default_type
if dbf_type is not None:
dbf_type = dbf_type.lower()
table = table_types.get(dbf_type)
if table is None:
raise DbfError("Unknown table type: %s" % dbf_type)
return object.__new__(table)
else:
base, ext = os.path.splitext(filename)
if ext.lower() != '.dbf':
filename = filename + '.dbf'
possibles = guess_table_type(filename)
if len(possibles) == 1:
return object.__new__(possibles[0][2])
else:
for type, desc, cls in possibles:
if type == default_type:
return object.__new__(cls)
else:
types = ', '.join(["%s" % item[1] for item in possibles])
abbrs = '[' + ' | '.join(["%s" % item[0] for item in possibles]) + ']'
raise DbfError("Table could be any of %s. Please specify %s when opening" % (types, abbrs))
def __bool__(self):
"""
True if table has any records
"""
return self._meta.header.record_count != 0
def __repr__(self):
return __name__ + ".Table(%r, status=%r)" % (self._meta.filename, self._meta.status)
def __str__(self):
status = self._meta.status
version = version_map.get(self._meta.header.version)
if version is not None:
version = self._version
else:
version = 'unknown - ' + hex(self._meta.header.version)
str = """
Table: %s
Type: %s
Codepage: %s
Status: %s
Last updated: %s
Record count: %d
Field count: %d
Record length: %d """ % (self.filename, version
, self.codepage, status,
self.last_update, len(self), self.field_count, self.record_length)
str += "\n --Fields--\n"
for i in range(len(self.field_names)):
str += "%11d) %s\n" % (i, self._field_layout(i))
return str
@property
def codepage(self):
"""
code page used for text translation
"""
return CodePage(code_pages[self._meta.header.codepage()][0])
@codepage.setter
def codepage(self, codepage):
if not isinstance(codepage, CodePage):
raise TypeError("codepage should be a CodePage, not a %r" % type(codepage))
meta = self._meta
if meta.status != READ_WRITE:
raise DbfError('%s not in read/write mode, unable to change codepage' % meta.filename)
meta.header.codepage(codepage.code)
meta.decoder = codecs.getdecoder(codepage.name)
meta.encoder = codecs.getencoder(codepage.name)
self._update_disk(headeronly=True)
@property
def field_count(self):
"""
the number of user fields in the table
"""
return self._meta.user_field_count
@property
def field_names(self):
"""
a list of the user fields in the table
"""
return self._meta.user_fields[:]
@property
def filename(self):
"""
table's file name, including path (if specified on open)
"""
return self._meta.filename
@property
def last_update(self):
"""
date of last update
"""
return self._meta.header.update
@property
def memoname(self):
"""
table's memo name (if path included in filename on open)
"""
return self._meta.memoname
@property
def record_length(self):
"""
number of bytes in a record (including deleted flag and null field size
"""
return self._meta.header.record_length
@property
def supported_tables(self):
"""
allowable table types
"""
return self._supported_tables
@property
def status(self):
"""
CLOSED, READ_ONLY, or READ_WRITE
"""
return self._meta.status
@property
def version(self):
"""
returns the dbf type of the table
"""
return self._version
def add_fields(self, field_specs):
"""
adds field(s) to the table layout; format is Name Type(Length,Decimals)[; Name Type(Length,Decimals)[...]]
backup table is created with _backup appended to name
then zaps table, recreates current structure, and copies records back from the backup
"""
meta = self._meta
if meta.status != READ_WRITE:
raise DbfError('%s not in read/write mode, unable to add fields (%s)' % (meta.filename, meta.status))
header = meta.header
fields = self.structure() + self._list_fields(field_specs, sep=';')
if (len(fields) + ('_nullflags' in meta)) > meta.max_fields:
raise DbfError(
"Adding %d more field%s would exceed the limit of %d"
% (len(fields), ('','s')[len(fields)==1], meta.max_fields)
)
old_table = None
if self:
old_table = self.create_backup()
self.zap()
if meta.mfd is not None and not meta.ignorememos:
meta.mfd.close()
meta.mfd = None
meta.memo = None
if not meta.ignorememos:
meta.newmemofile = True
offset = 1
for name in meta.fields:
del meta[name]
meta.fields[:] = []
meta.blankrecord = None
for field in fields:
field = field.lower()
pieces = field.split()
name = pieces.pop(0)
if '(' in pieces[0]:
loc = pieces[0].index('(')
pieces.insert(0, pieces[0][:loc])
pieces[1] = pieces[1][loc:]
format = FieldType(pieces.pop(0))
if pieces and '(' in pieces[0]:
for i, p in enumerate(pieces):
if ')' in p:
pieces[0:i+1] = [''.join(pieces[0:i+1])]
break
if name[0] == '_' or name[0].isdigit() or not name.replace('_', '').isalnum():
raise FieldSpecError("%s invalid: field names must start with a letter, and can only contain letters, digits, and _" % name)
# name = unicode(name)
if name in meta.fields:
raise DbfError("Field '%s' already exists" % name)
field_type = format
if len(name) > 10:
raise FieldSpecError("Maximum field name length is 10. '%s' is %d characters long." % (name, len(name)))
if not field_type in meta.fieldtypes.keys():
raise FieldSpecError("Unknown field type: %s" % field_type)
init = self._meta.fieldtypes[field_type]['Init']
flags = self._meta.fieldtypes[field_type]['flags']
try:
length, decimals, flags = init(pieces, flags)
except FieldSpecError:
exc = sys.exc_info()[1]
raise FieldSpecError(exc.message + ' (%s:%s)' % (meta.filename, name)) from None
start = offset
end = offset + length
offset = end
meta.fields.append(name)
cls = meta.fieldtypes[field_type]['Class']
empty = meta.fieldtypes[field_type]['Empty']
meta[name] = (
field_type,
start,
length,
end,
decimals,
flags,
cls,
empty,
)
self._build_header_fields()
self._update_disk()
if old_table is not None:
old_table.open()
for record in old_table:
self.append(scatter(record))
old_table.close()
def allow_nulls(self, fields):
"""
set fields to allow null values
"""
meta = self._meta
if meta.status != READ_WRITE:
raise DbfError('%s not in read/write mode, unable to change field types' % meta.filename)
elif self._versionabbr in ('db3', ):
raise DbfError("Nullable fields are not allowed in %s tables" % self._version)
header = meta.header
fields = self._list_fields(fields)
missing = set(fields) - set(self.field_names)
if missing:
raise FieldMissingError(', '.join(missing))
if len(self.field_names) + 1 > meta.max_fields:
raise DbfError(
"Adding the hidden _nullflags field would exceed the limit of %d fields for this table"
% (meta.max_fields, )
)
old_table = None
if self:
old_table = self.create_backup()
self.zap()
if meta.mfd is not None and not meta.ignorememos:
meta.mfd.close()
meta.mfd = None
meta.memo = None
if not meta.ignorememos:
meta.newmemofile = True
for field in fields:
specs = list(meta[field])
specs[FLAGS] |= NULLABLE
meta[field] = tuple(specs)
meta.blankrecord = None
self._build_header_fields()
self._update_disk()
if old_table is not None:
old_table.open()
for record in old_table:
self.append(scatter(record))
old_table.close()
def append(self, data=b'', drop=False, multiple=1):
"""
adds <multiple> blank records, and fills fields with dict/tuple values if present
"""
meta = self._meta
if meta.status != READ_WRITE:
raise DbfError('%s not in read/write mode, unable to append records' % meta.filename)
if not self.field_count:
raise DbfError("No fields defined, cannot append")
empty_table = len(self) == 0
dictdata = False
tupledata = False
header = meta.header
kamikaze = b''
if header.record_count == meta.max_records:
raise DbfError("table %r is full; unable to add any more records" % self)
if isinstance(data, (Record, RecordTemplate)):
if data._meta.record_sig[0] == self._meta.record_sig[0]:
kamikaze = data._data
else:
if isinstance(data, dict):
dictdata = data
data = b''
elif isinstance(data, tuple):
if len(data) > self.field_count:
raise DbfError("incoming data has too many values")
tupledata = data
data = b''
elif data:
raise TypeError("data to append must be a tuple, dict, record, or template; not a %r" % type(data))
newrecord = Record(recnum=header.record_count, layout=meta, kamikaze=kamikaze)
if kamikaze and meta.memofields:
newrecord._start_flux()
for field in meta.memofields:
newrecord[field] = data[field]
newrecord._commit_flux()
self._table.append(newrecord)
header.record_count += 1
if not kamikaze:
try:
if dictdata:
gather(newrecord, dictdata, drop=drop)
elif tupledata:
newrecord._start_flux()
for index, item in enumerate(tupledata):
newrecord[index] = item
newrecord._commit_flux()
elif data:
newrecord._start_flux()
data_fields = field_names(data)
my_fields = self.field_names
for field in data_fields:
if field not in my_fields:
if not drop:
raise DbfError("field %r not in table %r" % (field, self))
else:
newrecord[field] = data[field]
newrecord._commit_flux()
except Exception:
self._table.pop() # discard failed record
header.record_count = header.record_count - 1
self._update_disk()
raise
multiple -= 1
if multiple:
data = newrecord._data
single = header.record_count
total = single + multiple
while single < total:
multi_record = Record(single, meta, kamikaze=data)
multi_record._start_flux()
self._table.append(multi_record)
for field in meta.memofields:
multi_record[field] = newrecord[field]
single += 1
multi_record._commit_flux()
header.record_count = total # += multiple
newrecord = multi_record
self._update_disk(headeronly=True)
def close(self):
"""
closes disk files, flushing record data to disk
ensures table data is available if keep_table
ensures memo data is available if keep_memos
"""
if self._meta.location == ON_DISK and self._meta.status != CLOSED:
self._table.flush()
if self._meta.mfd is not None:
self._meta.mfd.close()
self._meta.mfd = None
self._meta.dfd.close()
self._meta.dfd = None
self._meta.status = CLOSED
def create_backup(self, new_name=None, on_disk=None):
"""
creates a backup table
"""
meta = self._meta
already_open = meta.status != CLOSED
if not already_open:
self.open()
if on_disk is None:
on_disk = meta.location
if not on_disk and new_name is None:
new_name = self.filename + '_backup'
if new_name is None:
upper = self.filename.isupper()
directory, filename = os.path.split(self.filename)
name, ext = os.path.splitext(filename)
extra = ('_backup', '_BACKUP')[upper]
new_name = os.path.join(temp_dir or directory, name + extra + ext)
bkup = Table(new_name, self.structure(), codepage=self.codepage.name, dbf_type=self._versionabbr, on_disk=on_disk)
# use same encoder/decoder as current table, which may have been overridden
bkup._meta.encoder = self._meta.encoder
bkup._meta.decoder = self._meta.decoder
bkup.open()
for record in self:
bkup.append(record)
bkup.close()
self.backup = new_name
if not already_open:
self.close()
return bkup
def create_index(self, key):
"""
creates an in-memory index using the function key
"""
meta = self._meta
if meta.status == CLOSED:
raise DbfError('%s is closed' % meta.filename)
return Index(self, key)
def create_template(self, record=None, defaults=None):
"""
returns a record template that can be used like a record
"""
return RecordTemplate(self._meta, original_record=record, defaults=defaults)
def delete_fields(self, doomed):
"""
removes field(s) from the table
creates backup files with _backup appended to the file name,
then modifies current structure
"""
meta = self._meta
if meta.status != READ_WRITE:
raise DbfError('%s not in read/write mode, unable to delete fields' % meta.filename)
doomed = self._list_fields(doomed)
header = meta.header
for victim in doomed:
if victim not in meta.user_fields:
raise DbfError("field %s not in table -- delete aborted" % victim)
old_table = None
if self:
old_table = self.create_backup()
self.zap()
if meta.mfd is not None and not meta.ignorememos:
meta.mfd.close()
meta.mfd = None
meta.memo = None
if not meta.ignorememos:
meta.newmemofile = True
if '_nullflags' in meta.fields:
doomed.append('_nullflags')
for victim in doomed:
layout = meta[victim]
meta.fields.pop(meta.fields.index(victim))
start = layout[START]
end = layout[END]
for field in meta.fields:
if meta[field][START] == end:
specs = list(meta[field])
end = specs[END] #self._meta[field][END]
specs[START] = start #self._meta[field][START] = start
specs[END] = start + specs[LENGTH] #self._meta[field][END] = start + self._meta[field][LENGTH]
start = specs[END] #self._meta[field][END]
meta[field] = tuple(specs)
self._build_header_fields()
self._update_disk()
for name in list(meta):
if name not in meta.fields:
del meta[name]
if old_table is not None:
old_table.open()
for record in old_table:
self.append(scatter(record), drop=True)
old_table.close()
def disallow_nulls(self, fields):
"""
set fields to not allow null values
"""
meta = self._meta
if meta.status != READ_WRITE:
raise DbfError('%s not in read/write mode, unable to change field types' % meta.filename)
fields = self._list_fields(fields)
missing = set(fields) - set(self.field_names)
if missing:
raise FieldMissingError(', '.join(missing))
old_table = None
if self:
old_table = self.create_backup()
self.zap()
if meta.mfd is not None and not meta.ignorememos:
meta.mfd.close()
meta.mfd = None
meta.memo = None
if not meta.ignorememos:
meta.newmemofile = True
for field in fields:
specs = list(meta[field])
specs[FLAGS] &= 0xff ^ NULLABLE
meta[field] = tuple(specs)
meta.blankrecord = None
self._build_header_fields()
self._update_disk()
if old_table is not None:
old_table.open()
for record in old_table:
self.append(scatter(record))
old_table.close()
def field_info(self, field):
"""
returns (field type, size, dec, class) of field
"""
if field in self.field_names:
field = self._meta[field]
return FieldInfo(field[TYPE], field[LENGTH], field[DECIMALS], field[CLASS])
raise FieldMissingError("%s is not a field in %s" % (field, self.filename))
def index(self, record, start=None, stop=None):
"""
returns the index of record between start and stop
start and stop default to the first and last record
"""
if not isinstance(record, (Record, RecordTemplate, dict, tuple)):
raise TypeError("x should be a record, template, dict, or tuple, not %r" % type(record))
meta = self._meta
if meta.status == CLOSED:
raise DbfError('%s is closed' % meta.filename)
if start is None:
start = 0
if stop is None:
stop = len(self)
for i in range(start, stop):
if record == (self[i]):
return i
else:
raise NotFoundError("dbf.Table.index(x): x not in table", data=record)
def new(self, filename, field_specs=None, memo_size=None, ignore_memos=None, codepage=None, default_data_types=None, field_data_types=None, on_disk=True):
"""
returns a new table of the same type
"""
if field_specs is None:
field_specs = self.structure()
if on_disk:
path, name = os.path.split(filename)
if path == "":
filename = os.path.join(os.path.split(self.filename)[0], filename)
elif name == "":
filename = os.path.join(path, os.path.split(self.filename)[1])
if memo_size is None:
memo_size = self._meta.memo_size
if ignore_memos is None:
ignore_memos = self._meta.ignorememos
if codepage is None:
codepage = self._meta.header.codepage()#[0]
if default_data_types is None:
default_data_types = self._meta._default_data_types
if field_data_types is None:
field_data_types = self._meta._field_data_types
return Table(filename, field_specs, memo_size, ignore_memos, codepage, default_data_types, field_data_types, dbf_type=self._versionabbr, on_disk=on_disk)
def nullable_field(self, field):
"""
returns True if field allows Nulls
"""
if field not in self.field_names:
raise MissingField(field)
return bool(self._meta[field][FLAGS] & NULLABLE)
def open(self, mode=READ_WRITE):
"""
(re)opens disk table, (re)initializes data structures
"""
if mode not in (READ_WRITE, READ_ONLY):
raise DbfError("mode for open must be 'read-write' or 'read-only', not %r" % mode)
meta = self._meta
if meta.status == mode:
return self # no-op
meta.status = mode
if meta.location == IN_MEMORY:
return self
if '_table' in dir(self):
del self._table
dfd = meta.dfd = open(meta.filename, 'r+b')
dfd.seek(0)
header = meta.header = self._TableHeader(dfd.read(32), self._pack_date, self._unpack_date)
if not header.version in self._supported_tables:
dfd.close()
dfd = None
raise DbfError("Unsupported dbf type: %s [%x]" % (version_map.get(header.version, 'Unknown: %s' % header.version), header.version))
fieldblock = dfd.read(header.start - 32)
for i in range(len(fieldblock) // 32 + 1):
fieldend = i * 32
if fieldblock[fieldend] == CR:
break
else:
raise BadDataError("corrupt field structure in header")
if len(fieldblock[:fieldend]) % 32 != 0:
raise BadDataError("corrupt field structure in header")
header.fields = fieldblock[:fieldend]
header.extra = fieldblock[fieldend + 1:] # skip trailing \r
self._meta.ignorememos = self._meta.original_ignorememos
self._initialize_fields()
self._check_memo_integrity()
self._index = -1
dfd.seek(0)
return self
def pack(self):
"""
physically removes all deleted records
"""
meta = self._meta
if meta.status != READ_WRITE:
raise DbfError('%s not in read/write mode, unable to pack records' % meta.filename)
for dbfindex in self._indexen:
dbfindex._clear()
newtable = []
index = 0
for record in self._table:
if is_deleted(record):
record._recnum = -1
else:
record._recnum = index
newtable.append(record)
index += 1
if meta.location == ON_DISK:
self._table.clear()
else:
self._table[:] = []
for record in newtable:
self._table.append(record)
self._pack_count += 1
self._meta.header.record_count = index
self._index = -1
self._update_disk()
self.reindex()
def query(self, criteria):
"""
criteria is a string that will be converted into a function that returns
a List of all matching records
"""
meta = self._meta
if meta.status == CLOSED:
raise DbfError('%s is closed' % meta.filename)
return pql(self, criteria)
def reindex(self):
"""
reprocess all indices for this table
"""
meta = self._meta
if meta.status == CLOSED:
raise DbfError('%s is closed' % meta.filename)
for dbfindex in self._indexen:
dbfindex._reindex()
def rename_field(self, oldname, newname):
"""
renames an existing field
"""
meta = self._meta
if meta.status != READ_WRITE:
raise DbfError('%s not in read/write mode, unable to change field names' % meta.filename)
if self:
self.create_backup()
if not oldname in self._meta.user_fields:
raise FieldMissingError("field --%s-- does not exist -- cannot rename it." % oldname)
if newname[0] == '_' or newname[0].isdigit() or not newname.replace('_', '').isalnum():
raise FieldSpecError("field names cannot start with _ or digits, and can only contain the _, letters, and digits")
newname = newname.lower()
if newname in self._meta.fields:
raise DbfError("field --%s-- already exists" % newname)
if len(newname) > 10:
raise FieldSpecError("maximum field name length is 10. '%s' is %d characters long." % (newname, len(newname)))
self._meta[newname] = self._meta[oldname]
self._meta.fields[self._meta.fields.index(oldname)] = newname
self._build_header_fields()
self._update_disk(headeronly=True)
def resize_field(self, chosen, new_size):
"""
resizes field (C only at this time)
creates backup file, then modifies current structure
"""
meta = self._meta
if meta.status != READ_WRITE:
raise DbfError('%s not in read/write mode, unable to change field size' % meta.filename)
if not 0 < new_size < 256:
raise DbfError("new_size must be between 1 and 255 (use delete_fields to remove a field)")
chosen = self._list_fields(chosen)
for candidate in chosen:
if candidate not in self._meta.user_fields:
raise DbfError("field %s not in table -- resize aborted" % candidate)
elif self.field_info(candidate).field_type != FieldType.CHAR:
raise DbfError("field %s is not Character -- resize aborted" % candidate)
if self:
old_table = self.create_backup()
self.zap()
if meta.mfd is not None and not meta.ignorememos:
meta.mfd.close()
meta.mfd = None
meta.memo = None
if not meta.ignorememos:
meta.newmemofile = True
struct = self.structure()
meta.user_fields[:] = []
new_struct = []
for field_spec in struct:
name, spec = field_spec.split(' ', 1)
if name in chosen:
spec = "C(%d)" % new_size
new_struct.append(' '.join([name, spec]))
self.add_fields(';'.join(new_struct))
if old_table is not None:
old_table.open()
for record in old_table:
self.append(scatter(record), drop=True)
old_table.close()
def structure(self, fields=None):
"""
return field specification list suitable for creating same table layout
fields should be a list of fields or None for all fields in table
"""
field_specs = []
fields = self._list_fields(fields)
try:
for name in fields:
field_specs.append(self._field_layout(self.field_names.index(name)))
except ValueError:
raise DbfError("field %s does not exist" % name) from None
return field_specs
def zap(self):
"""
removes all records from table -- this cannot be undone!
"""
meta = self._meta
if meta.status != READ_WRITE:
raise DbfError('%s not in read/write mode, unable to zap table' % meta.filename)
if meta.location == IN_MEMORY:
self._table[:] = []
else:
self._table.clear()
if meta.memo:
meta.memo._zap()
meta.header.record_count = 0
self._index = -1
self._update_disk()
class Db3Table(Table):
"""
Provides an interface for working with dBase III tables.
"""
_version = 'dBase III Plus'
_versionabbr = 'db3'
@MutableDefault
def _field_types():
return {
CHAR: {
'Type':'Character', 'Retrieve':retrieve_character, 'Update':update_character, 'Blank':lambda x: b' ' * x, 'Init':add_character,
'Class':str, 'Empty':str, 'flags':tuple(),
},
DATE: {
'Type':'Date', 'Retrieve':retrieve_date, 'Update':update_date, 'Blank':lambda x: b' ', 'Init':add_date,
'Class':datetime.date, 'Empty':none, 'flags':tuple(),
},
NUMERIC: {
'Type':'Numeric', 'Retrieve':retrieve_numeric, 'Update':update_numeric, 'Blank':lambda x: b' ' * x, 'Init':add_numeric,
'Class':'default', 'Empty':none, 'flags':tuple(),
},
LOGICAL: {
'Type':'Logical', 'Retrieve':retrieve_logical, 'Update':update_logical, 'Blank':lambda x: b'?', 'Init':add_logical,
'Class':bool, 'Empty':none, 'flags':tuple(),
},
MEMO: {
'Type':'Memo', 'Retrieve':retrieve_memo, 'Update':update_memo, 'Blank':lambda x: b' ', 'Init':add_memo,
'Class':str, 'Empty':str, 'flags':tuple(),
},
FLOAT: {
'Type':'Numeric', 'Retrieve':retrieve_numeric, 'Update':update_numeric, 'Blank':lambda x: b' ' * x, 'Init':add_numeric,
'Class':'default', 'Empty':none, 'flags':tuple(),
} }
_memoext = '.dbt'
_memoClass = _Db3Memo
_yesMemoMask = 0x80
_noMemoMask = 0x7f
_binary_types = ()
_character_types = (CHAR, MEMO)
_currency_types = tuple()
_date_types = (DATE, )
_datetime_types = tuple()
_decimal_types = (NUMERIC, FLOAT)
_fixed_types = (DATE, LOGICAL, MEMO)
_logical_types = (LOGICAL, )
_memo_types = (MEMO, )
_numeric_types = (NUMERIC, FLOAT)
_variable_types = (CHAR, NUMERIC, FLOAT)
_dbfTableHeader = array('B', [0] * 32)
_dbfTableHeader[0] = 3 # version - dBase III w/o memo's
_dbfTableHeader[8:10] = array('B', pack_short_int(33))
_dbfTableHeader[10] = 1 # record length -- one for delete flag
_dbfTableHeader[29] = 3 # code page -- 437 US-MS DOS
_dbfTableHeader = _dbfTableHeader.tobytes()
_dbfTableHeaderExtra = b''
_supported_tables = (0x03, 0x83)
def _check_memo_integrity(self):
"""
dBase III and Clipper
"""
if not self._meta.ignorememos:
memo_fields = False
for field in self._meta.fields:
if self._meta[field][TYPE] in self._memo_types:
memo_fields = True
break
if memo_fields and self._meta.header.version != 0x83:
self._meta.dfd.close()
self._meta.dfd = None
raise BadDataError("Table structure corrupt: memo fields exist, header declares no memos")
elif memo_fields and not os.path.exists(self._meta.memoname):
self._meta.dfd.close()
self._meta.dfd = None
raise BadDataError("Table structure corrupt: memo fields exist without memo file")
if memo_fields:
try:
self._meta.memo = self._memoClass(self._meta)
except Exception:
exc = sys.exc_info()[1]
self._meta.dfd.close()
self._meta.dfd = None
raise BadDataError("Table structure corrupt: unable to use memo file (%s)" % exc.args[-1]) from None
def _initialize_fields(self):
"""
builds the FieldList of names, types, and descriptions
"""
old_fields = defaultdict(dict)
meta = self._meta
for name in meta.fields:
old_fields[name]['type'] = meta[name][TYPE]
old_fields[name]['empty'] = meta[name][EMPTY]
old_fields[name]['class'] = meta[name][CLASS]
meta.fields[:] = []
offset = 1
fieldsdef = meta.header.fields
if len(fieldsdef) % 32 != 0:
raise BadDataError("field definition block corrupt: %d bytes in size" % len(fieldsdef))
if len(fieldsdef) // 32 != meta.header.field_count:
raise BadDataError("Header shows %d fields, but field definition block has %d fields" % (meta.header.field_count, len(fieldsdef) // 32))
total_length = meta.header.record_length
for i in range(meta.header.field_count):
fieldblock = fieldsdef[i*32:(i+1)*32]
name = self._meta.decoder(unpack_str(fieldblock[:11]))[0]
type = fieldblock[11]
if not type in meta.fieldtypes:
raise BadDataError("Unknown field type: %s" % type)
start = offset
length = fieldblock[16]
offset += length
end = start + length
decimals = fieldblock[17]
flags = fieldblock[18]
if name in meta.fields:
raise BadDataError('Duplicate field name found: %s' % name)
meta.fields.append(name)
if name in old_fields and old_fields[name]['type'] == type:
cls = old_fields[name]['class']
empty = old_fields[name]['empty']
else:
cls = meta.fieldtypes[type]['Class']
empty = meta.fieldtypes[type]['Empty']
meta[name] = (
type,
start,
length,
end,
decimals,
flags,
cls,
empty,
)
if offset != total_length:
raise BadDataError("Header shows record length of %d, but calculated record length is %d" % (total_length, offset))
meta.user_fields = [f for f in meta.fields if not meta[f][FLAGS] & SYSTEM]
meta.user_field_count = len(meta.user_fields)
Record._create_blank_data(meta)
class ClpTable(Db3Table):
"""
Provides an interface for working with Clipper tables.
"""
_version = 'Clipper 5'
_versionabbr = 'clp'
@MutableDefault
def _field_types():
return {
CHAR: {
'Type':'Character', 'Retrieve':retrieve_character, 'Update':update_character, 'Blank':lambda x: b' ' * x, 'Init':add_clp_character,
'Class':str, 'Empty':str, 'flags':tuple(),
},
DATE: {
'Type':'Date', 'Retrieve':retrieve_date, 'Update':update_date, 'Blank':lambda x: b' ', 'Init':add_date,
'Class':datetime.date, 'Empty':none, 'flags':tuple(),
},
NUMERIC: {
'Type':'Numeric', 'Retrieve':retrieve_numeric, 'Update':update_numeric, 'Blank':lambda x: b' ' * x, 'Init':add_numeric,
'Class':'default', 'Empty':none, 'flags':tuple(),
},
LOGICAL: {
'Type':'Logical', 'Retrieve':retrieve_logical, 'Update':update_logical, 'Blank':lambda x: b'?', 'Init':add_logical,
'Class':bool, 'Empty':none, 'flags':tuple(),
},
MEMO: {
'Type':'Memo', 'Retrieve':retrieve_memo, 'Update':update_memo, 'Blank':lambda x: b' ', 'Init':add_memo,
'Class':str, 'Empty':str, 'flags':tuple(),
},
FLOAT: {
'Type':'Numeric', 'Retrieve':retrieve_numeric, 'Update':update_numeric, 'Blank':lambda x: b' ' * x, 'Init':add_numeric,
'Class':'default', 'Empty':none, 'flags':tuple(),
} }
_memoext = '.dbt'
_memoClass = _Db3Memo
_yesMemoMask = 0x80
_noMemoMask = 0x7f
_binary_types = ()
_character_types = (CHAR, MEMO)
_currency_types = tuple()
_date_types = (DATE, )
_datetime_types = tuple()
_decimal_types = (NUMERIC, FLOAT)
_fixed_types = (DATE, LOGICAL, MEMO)
_logical_types = (LOGICAL, )
_memo_types = (MEMO, )
_numeric_types = (NUMERIC, FLOAT)
_variable_types = (CHAR, NUMERIC, FLOAT)
_dbfTableHeader = array('B', [0] * 32)
_dbfTableHeader[0] = 3 # version - dBase III w/o memo's
_dbfTableHeader[8:10] = array('B', pack_short_int(33))
_dbfTableHeader[10] = 1 # record length -- one for delete flag
_dbfTableHeader[29] = 3 # code page -- 437 US-MS DOS
_dbfTableHeader = _dbfTableHeader.tobytes()
_dbfTableHeaderExtra = b''
_supported_tables = (0x03, 0x83)
class _TableHeader(Table._TableHeader):
"""
represents the data block that defines a tables type and layout
"""
@property
def fields(self):
"field block structure"
fieldblock = self._data[32:]
for i in range(len(fieldblock)//32+1):
cr = i * 32
if fieldblock[cr] == CR:
break
else:
raise BadDataError("corrupt field structure")
return fieldblock[:cr].tobytes()
@fields.setter
def fields(self, block):
fieldblock = self._data[32:]
for i in range(len(fieldblock)//32+1):
cr = i * 32
if fieldblock[cr] == CR:
break
else:
raise BadDataError("corrupt field structure")
cr += 32 # convert to indexing main structure
fieldlen = len(block)
if fieldlen % 32 != 0:
raise BadDataError("fields structure corrupt: %d is not a multiple of 32" % fieldlen)
self._data[32:cr] = array('B', block) # fields
self._data[8:10] = array('B', pack_short_int(len(self._data))) # start
fieldlen = fieldlen // 32
recordlen = 1 # deleted flag
for i in range(fieldlen):
recordlen += block[i*32+16]
if block[i*32+11] == CHAR:
recordlen += block[i*32+17] * 256
self._data[10:12] = array('B', pack_short_int(recordlen))
def _build_header_fields(self):
"""
constructs fieldblock for disk table
"""
fieldblock = array('B', b'')
memo = False
nulls = False
meta = self._meta
header = meta.header
header.version = header.version & self._noMemoMask
meta.fields = [f for f in meta.fields if f != '_nullflags']
total_length = 1 # delete flag
for field in meta.fields:
layout = meta[field]
if meta.fields.count(field) > 1:
raise BadDataError("corrupted field structure (noticed in _build_header_fields)")
fielddef = array('B', [0] * 32)
fielddef[:11] = array('B', pack_str(meta.encoder(field)[0]))
fielddef[11] = layout[TYPE]
fielddef[12:16] = array('B', pack_long_int(layout[START]))
total_length += layout[LENGTH]
if layout[TYPE] == CHAR: # long character field
fielddef[16] = layout[LENGTH] % 256
fielddef[17] = layout[LENGTH] // 256
else:
fielddef[16] = layout[LENGTH]
fielddef[17] = layout[DECIMALS]
fielddef[18] = layout[FLAGS]
fieldblock.extend(fielddef)
if layout[TYPE] in meta.memo_types:
memo = True
if layout[FLAGS] & NULLABLE:
nulls = True
if memo:
header.version = header.version | self._yesMemoMask
if meta.memo is None:
meta.memo = self._memoClass(meta)
else:
if os.path.exists(meta.memoname):
if meta.mfd is not None:
meta.mfd.close()
os.remove(meta.memoname)
meta.memo = None
if nulls:
start = layout[START] + layout[LENGTH]
length, one_more = divmod(len(meta.fields), 8)
if one_more:
length += 1
fielddef = array('B', [0] * 32)
fielddef[:11] = array('B', pack_str(b'_nullflags'))
fielddef[11] = FieldType._NULLFLAG
fielddef[12:16] = array('B', pack_long_int(start))
fielddef[16] = length
fielddef[17] = 0
fielddef[18] = BINARY | SYSTEM
fieldblock.extend(fielddef)
meta.fields.append('_nullflags')
nullflags = (
_NULLFLAG, # type
start, # start
length, # length
start + length, # end
0, # decimals
BINARY | SYSTEM, # flags
none, # class
none, # empty
)
meta['_nullflags'] = nullflags
header.fields = fieldblock.tobytes()
header.record_length = total_length
meta.user_fields = [f for f in meta.fields if not meta[f][FLAGS] & SYSTEM]
meta.user_field_count = len(meta.user_fields)
Record._create_blank_data(meta)
def _initialize_fields(self):
"""
builds the FieldList of names, types, and descriptions
"""
meta = self._meta
old_fields = defaultdict(dict)
for name in meta.fields:
old_fields[name]['type'] = meta[name][TYPE]
old_fields[name]['empty'] = meta[name][EMPTY]
old_fields[name]['class'] = meta[name][CLASS]
meta.fields[:] = []
offset = 1
fieldsdef = meta.header.fields
if len(fieldsdef) % 32 != 0:
raise BadDataError("field definition block corrupt: %d bytes in size" % len(fieldsdef))
if len(fieldsdef) // 32 != meta.header.field_count:
raise BadDataError("Header shows %d fields, but field definition block has %d fields"
(meta.header.field_count, len(fieldsdef) // 32))
total_length = meta.header.record_length
for i in range(meta.header.field_count):
fieldblock = fieldsdef[i*32:(i+1)*32]
name = self._meta.decoder(unpack_str(fieldblock[:11]))[0]
type = fieldblock[11]
if not type in meta.fieldtypes:
raise BadDataError("Unknown field type: %s" % type)
start = offset
length = fieldblock[16]
decimals = fieldblock[17]
if type == CHAR:
length += decimals * 256
offset += length
end = start + length
flags = fieldblock[18]
if name in meta.fields:
raise BadDataError('Duplicate field name found: %s' % name)
meta.fields.append(name)
if name in old_fields and old_fields[name]['type'] == type:
cls = old_fields[name]['class']
empty = old_fields[name]['empty']
else:
cls = meta.fieldtypes[type]['Class']
empty = meta.fieldtypes[type]['Empty']
meta[name] = (
type,
start,
length,
end,
decimals,
flags,
cls,
empty,
)
if offset != total_length:
raise BadDataError("Header shows record length of %d, but calculated record length is %d"
(total_length, offset))
meta.user_fields = [f for f in meta.fields if not meta[f][FLAGS] & SYSTEM]
meta.user_field_count = len(meta.user_fields)
Record._create_blank_data(meta)
class FpTable(Table):
"""
Provides an interface for working with FoxPro 2 tables
"""
_version = 'Foxpro'
_versionabbr = 'fp'
@MutableDefault
def _field_types():
return {
CHAR: {
'Type':'Character', 'Retrieve':retrieve_character, 'Update':update_character, 'Blank':lambda x: b' ' * x, 'Init':add_vfp_character,
'Class':str, 'Empty':str, 'flags':('binary', 'nocptrans', 'null', ),
},
FLOAT: {
'Type':'Float', 'Retrieve':retrieve_numeric, 'Update':update_numeric, 'Blank':lambda x: b' ' * x, 'Init':add_vfp_numeric,
'Class':'default', 'Empty':none, 'flags':('null', ),
},
NUMERIC: {
'Type':'Numeric', 'Retrieve':retrieve_numeric, 'Update':update_numeric, 'Blank':lambda x: b' ' * x, 'Init':add_vfp_numeric,
'Class':'default', 'Empty':none, 'flags':('null', ),
},
LOGICAL: {
'Type':'Logical', 'Retrieve':retrieve_logical, 'Update':update_logical, 'Blank':lambda x: b'?', 'Init':add_logical,
'Class':bool, 'Empty':none, 'flags':('null', ),
},
DATE: {
'Type':'Date', 'Retrieve':retrieve_date, 'Update':update_date, 'Blank':lambda x: b' ', 'Init':add_date,
'Class':datetime.date, 'Empty':none, 'flags':('null', ),
},
MEMO: {
'Type':'Memo', 'Retrieve':retrieve_memo, 'Update':update_memo, 'Blank':lambda x: b' ', 'Init':add_memo,
'Class':str, 'Empty':str, 'flags':('binary', 'nocptrans', 'null', ),
},
GENERAL: {
'Type':'General', 'Retrieve':retrieve_memo, 'Update':update_memo, 'Blank':lambda x: b' ', 'Init':add_binary_memo,
'Class':bytes, 'Empty':bytes, 'flags':('null', ),
},
PICTURE: {
'Type':'Picture', 'Retrieve':retrieve_memo, 'Update':update_memo, 'Blank':lambda x: b' ', 'Init':add_binary_memo,
'Class':bytes, 'Empty':bytes, 'flags':('null', ),
},
_NULLFLAG: {
'Type':'_NullFlags', 'Retrieve':unsupported_type, 'Update':unsupported_type, 'Blank':lambda x: b'\x00' * x, 'Init':None,
'Class':none, 'Empty':none, 'flags':('binary', 'system', ),
} }
_memoext = '.fpt'
_memoClass = _VfpMemo
_yesMemoMask = 0xf5 # 1111 0101
_noMemoMask = 0x03 # 0000 0011
_binary_types = (GENERAL, MEMO, PICTURE)
# _character_types = ('C', 'D', 'F', 'L', 'M', 'N') # field representing character data
_character_types = (CHAR, DATE, FLOAT, LOGICAL, MEMO, NUMERIC) # field representing character data
_currency_types = tuple()
_date_types = (DATE, )
_datetime_types = tuple()
# _fixed_types = ('D', 'G', 'L', 'M', 'P')
_fixed_types = (DATE, GENERAL, LOGICAL, MEMO, PICTURE)
_logical_types = (LOGICAL, )
_memo_types = (GENERAL, MEMO, PICTURE)
_numeric_types = (FLOAT, NUMERIC)
_text_types = (CHAR, MEMO)
_variable_types = (CHAR, FLOAT, NUMERIC)
_supported_tables = (0x03, 0xf5)
_dbfTableHeader = array('B', [0] * 32)
_dbfTableHeader[0] = 0x30 # version - Foxpro 6 0011 0000
_dbfTableHeader[8:10] = array('B', pack_short_int(33 + 263))
_dbfTableHeader[10] = 1 # record length -- one for delete flag
_dbfTableHeader[29] = 3 # code page -- 437 US-MS DOS
_dbfTableHeader = _dbfTableHeader.tobytes()
_dbfTableHeaderExtra = b'\x00' * 263
def _check_memo_integrity(self):
if not self._meta.ignorememos:
memo_fields = False
for field in self._meta.fields:
if self._meta[field][TYPE] in self._memo_types:
memo_fields = True
break
if memo_fields and not os.path.exists(self._meta.memoname):
self._meta.dfd.close()
self._meta.dfd = None
raise BadDataError("Table structure corrupt: memo fields exist without memo file")
elif not memo_fields and os.path.exists(self._meta.memoname):
self._meta.dfd.close()
self._meta.dfd = None
raise BadDataError("Table structure corrupt: no memo fields exist but memo file does")
if memo_fields:
try:
self._meta.memo = self._memoClass(self._meta)
except Exception:
exc = sys.exc_info()[1]
self._meta.dfd.close()
self._meta.dfd = None
raise BadDataError("Table structure corrupt: unable to use memo file (%s)" % exc.args[-1]) from None
def _initialize_fields(self):
"""
builds the FieldList of names, types, and descriptions
"""
meta = self._meta
old_fields = defaultdict(dict)
for name in meta.fields:
old_fields[name]['type'] = meta[name][TYPE]
old_fields[name]['class'] = meta[name][CLASS]
old_fields[name]['empty'] = meta[name][EMPTY]
meta.fields[:] = []
offset = 1
fieldsdef = meta.header.fields
if len(fieldsdef) % 32 != 0:
raise BadDataError("field definition block corrupt: %d bytes in size" % len(fieldsdef))
if len(fieldsdef) // 32 != meta.header.field_count:
raise BadDataError("Header shows %d fields, but field definition block has %d fields"
(meta.header.field_count, len(fieldsdef) // 32))
total_length = meta.header.record_length
for i in range(meta.header.field_count):
fieldblock = fieldsdef[i*32:(i+1)*32]
name = self._meta.decoder(unpack_str(fieldblock[:11]))[0]
type = fieldblock[11]
if not type in meta.fieldtypes:
raise BadDataError("Unknown field type: %s" % type)
start = offset
length = fieldblock[16]
offset += length
end = start + length
decimals = fieldblock[17]
flags = fieldblock[18]
if name in meta.fields:
raise BadDataError('Duplicate field name found: %s' % name)
meta.fields.append(name)
if name in old_fields and old_fields[name]['type'] == type:
cls = old_fields[name]['class']
empty = old_fields[name]['empty']
else:
cls = meta.fieldtypes[type]['Class']
empty = meta.fieldtypes[type]['Empty']
meta[name] = (
type,
start,
length,
end,
decimals,
flags,
cls,
empty,
)
if offset != total_length:
raise BadDataError("Header shows record length of %d, but calculated record length is %d" % (total_length, offset))
meta.user_fields = [f for f in meta.fields if not meta[f][FLAGS] & SYSTEM]
meta.user_field_count = len(meta.user_fields)
Record._create_blank_data(meta)
@staticmethod
def _pack_date(date):
"""
Returns a group of three bytes, in integer form, of the date
"""
# return "%c%c%c" % (date.year - 2000, date.month, date.day)
return bytes([date.year - 2000, date.month, date.day])
@staticmethod
def _unpack_date(bytestr):
"""
Returns a Date() of the packed three-byte date passed in
"""
year, month, day = struct.unpack('<BBB', bytestr)
year += 2000
return Date(year, month, day)
class VfpTable(FpTable):
"""
Provides an interface for working with Visual FoxPro 6 tables
"""
_version = 'Visual Foxpro'
_versionabbr = 'vfp'
@MutableDefault
def _field_types():
return {
CHAR: {
'Type':'Character', 'Retrieve':retrieve_character, 'Update':update_character, 'Blank':lambda x: b' ' * x, 'Init':add_vfp_character,
'Class':str, 'Empty':str, 'flags':('binary', 'nocptrans', 'null', ),
},
CURRENCY: {
'Type':'Currency', 'Retrieve':retrieve_currency, 'Update':update_currency, 'Blank':lambda x: b'\x00' * 8, 'Init':add_vfp_currency,
'Class':Decimal, 'Empty':none, 'flags':('null', ),
},
DOUBLE: {
'Type':'Double', 'Retrieve':retrieve_double, 'Update':update_double, 'Blank':lambda x: b'\x00' * 8, 'Init':add_vfp_double,
'Class':float, 'Empty':none, 'flags':('null', ),
},
FLOAT: {
'Type':'Float', 'Retrieve':retrieve_numeric, 'Update':update_numeric, 'Blank':lambda x: b' ' * x, 'Init':add_vfp_numeric,
'Class':'default', 'Empty':none, 'flags':('null', ),
},
NUMERIC: {
'Type':'Numeric', 'Retrieve':retrieve_numeric, 'Update':update_numeric, 'Blank':lambda x: b' ' * x, 'Init':add_vfp_numeric,
'Class':'default', 'Empty':none, 'flags':('null', ),
},
INTEGER: {
'Type':'Integer', 'Retrieve':retrieve_integer, 'Update':update_integer, 'Blank':lambda x: b'\x00' * 4, 'Init':add_vfp_integer,
'Class':int, 'Empty':none, 'flags':('null', ),
},
LOGICAL: {
'Type':'Logical', 'Retrieve':retrieve_logical, 'Update':update_logical, 'Blank':lambda x: b'?', 'Init':add_logical,
'Class':bool, 'Empty':none, 'flags':('null', ),
},
DATE: {
'Type':'Date', 'Retrieve':retrieve_date, 'Update':update_date, 'Blank':lambda x: b' ', 'Init':add_date,
'Class':datetime.date, 'Empty':none, 'flags':('null', ),
},
DATETIME: {
'Type':'DateTime', 'Retrieve':retrieve_vfp_datetime, 'Update':update_vfp_datetime, 'Blank':lambda x: b'\x00' * 8, 'Init':add_vfp_datetime,
'Class':datetime.datetime, 'Empty':none, 'flags':('null', ),
},
MEMO: {
'Type':'Memo', 'Retrieve':retrieve_vfp_memo, 'Update':update_vfp_memo, 'Blank':lambda x: b'\x00\x00\x00\x00', 'Init':add_vfp_memo,
'Class':str, 'Empty':str, 'flags':('binary', 'nocptrans', 'null', ),
},
GENERAL: {
'Type':'General', 'Retrieve':retrieve_vfp_memo, 'Update':update_vfp_memo, 'Blank':lambda x: b'\x00\x00\x00\x00', 'Init':add_vfp_binary_memo,
'Class':bytes, 'Empty':bytes, 'flags':('null', ),
},
PICTURE: {
'Type':'Picture', 'Retrieve':retrieve_vfp_memo, 'Update':update_vfp_memo, 'Blank':lambda x: b'\x00\x00\x00\x00', 'Init':add_vfp_binary_memo,
'Class':bytes, 'Empty':bytes, 'flags':('null', ),
},
_NULLFLAG: {
'Type':'_NullFlags', 'Retrieve':unsupported_type, 'Update':unsupported_type, 'Blank':lambda x: b'\x00' * x, 'Init':int,
'Class':none, 'Empty':none, 'flags':('binary', 'system',),
} }
_memoext = '.fpt'
_memoClass = _VfpMemo
_yesMemoMask = 0x30 # 0011 0000
_noMemoMask = 0x30 # 0011 0000
# _binary_types = ('B', 'G', 'I', 'P', 'T', 'Y')
_binary_types = (DOUBLE, GENERAL, INTEGER, MEMO, PICTURE, DATETIME, CURRENCY)
# _character_types = ('C', 'D', 'F', 'L', 'M', 'N') # field representing character data
_character_types = (CHAR, DATE, FLOAT, LOGICAL, MEMO, NUMERIC)
_currency_types = (CURRENCY, )
_date_types = (DATE, DATETIME)
_datetime_types = (DATETIME, )
# _fixed_types = ('B', 'D', 'G', 'I', 'L', 'M', 'P', 'T', 'Y')
_fixed_types = (DOUBLE, DATE, GENERAL, INTEGER, LOGICAL, MEMO, PICTURE, DATETIME, CURRENCY)
_logical_types = (LOGICAL, )
_memo_types = (GENERAL, MEMO, PICTURE)
# _numeric_types = ('B', 'F', 'I', 'N', 'Y')
_numeric_types = (DOUBLE, FLOAT, INTEGER, NUMERIC, CURRENCY)
_variable_types = (CHAR, FLOAT, NUMERIC)
_supported_tables = (0x30, 0x31)
_dbfTableHeader = array('B', [0] * 32)
_dbfTableHeader[0] = 0x30 # version - Foxpro 6 0011 0000
_dbfTableHeader[8:10] = array('B', pack_short_int(33 + 263))
_dbfTableHeader[10] = 1 # record length -- one for delete flag
_dbfTableHeader[29] = 3 # code page -- 437 US-MS DOS
_dbfTableHeader = _dbfTableHeader.tobytes()
_dbfTableHeaderExtra = b'\x00' * 263
def _initialize_fields(self):
"""
builds the FieldList of names, types, and descriptions
"""
meta = self._meta
old_fields = defaultdict(dict)
for name in meta.fields:
old_fields[name]['type'] = meta[name][TYPE]
old_fields[name]['class'] = meta[name][CLASS]
old_fields[name]['empty'] = meta[name][EMPTY]
meta.fields[:] = []
offset = 1
fieldsdef = meta.header.fields
meta.nullflags = None
total_length = meta.header.record_length
for i in range(meta.header.field_count):
fieldblock = fieldsdef[i*32:(i+1)*32]
name = self._meta.decoder(unpack_str(fieldblock[:11]))[0]
type = fieldblock[11]
if not type in meta.fieldtypes:
raise BadDataError("Unknown field type: %s" % type)
start = unpack_long_int(fieldblock[12:16])
length = fieldblock[16]
offset += length
end = start + length
decimals = fieldblock[17]
flags = fieldblock[18]
if name in meta.fields:
raise BadDataError('Duplicate field name found: %s' % name)
meta.fields.append(name)
if name in old_fields and old_fields[name]['type'] == type:
cls = old_fields[name]['class']
empty = old_fields[name]['empty']
else:
cls = meta.fieldtypes[type]['Class']
empty = meta.fieldtypes[type]['Empty']
meta[name] = (
type,
start,
length,
end,
decimals,
flags,
cls,
empty,
)
if offset != total_length:
raise BadDataError("Header shows record length of %d, but calculated record length is %d" % (total_length, offset))
meta.user_fields = [f for f in meta.fields if not meta[f][FLAGS] & SYSTEM]
meta.user_field_count = len(meta.user_fields)
Record._create_blank_data(meta)
class List(_Navigation):
"""
list of Dbf records, with set-like behavior
"""
_desc = ''
def __init__(self, records=None, desc=None, key=None):
self._list = []
self._set = set()
self._tables = dict()
if key is not None:
self.key = key
if key.__doc__ is None:
key.__doc__ = 'unknown'
key = self.key
self._current = -1
if isinstance(records, self.__class__) and key is records.key:
self._list = records._list[:]
self._set = records._set.copy()
self._current = 0
elif records is not None:
for record in records:
value = key(record)
item = (source_table(record), recno(record), value)
if value not in self._set:
self._set.add(value)
self._list.append(item)
self._current = 0
if desc is not None:
self._desc = desc
def __add__(self, other):
self._still_valid_check()
key = self.key
if isinstance(other, (Table, list)):
other = self.__class__(other, key=key)
if isinstance(other, self.__class__):
other._still_valid_check()
result = self.__class__()
result._set = self._set.copy()
result._list[:] = self._list[:]
result._tables = {}
result._tables.update(self._tables)
result.key = self.key
if key is other.key: # same key? just compare key values
for item in other._list:
result._maybe_add(item)
else: # different keys, use this list's key on other's records
for rec in other:
result._maybe_add((source_table(rec), recno(rec), key(rec)))
return result
return NotImplemented
def __contains__(self, data):
self._still_valid_check()
if not isinstance(data, (Record, RecordTemplate, tuple, dict)):
raise TypeError("%r is not a record, templace, tuple, nor dict" % (data, ))
try: # attempt quick method
item = self.key(data)
if not isinstance(item, tuple):
item = (item, )
return item in self._set
except Exception: # argh, try brute force method
for record in self:
if record == data:
return True
return False
def __delitem__(self, key):
self._still_valid_check()
if isinstance(key, baseinteger):
item = self._list.pop[key]
self._set.remove(item[2])
elif isinstance(key, slice):
self._set.difference_update([item[2] for item in self._list[key]])
self._list.__delitem__(key)
elif isinstance(key, (Record, RecordTemplate, dict, tuple)):
index = self.index(key)
item = self._list.pop[index]
self._set.remove(item[2])
else:
raise TypeError('%r should be an int, slice, record, template, tuple, or dict -- not a %r' % (key, type(key)))
def __getitem__(self, key):
self._still_valid_check()
if isinstance(key, baseinteger):
count = len(self._list)
if not -count <= key < count:
raise NotFoundError("Record %d is not in list." % key)
return self._get_record(*self._list[key])
elif isinstance(key, slice):
result = self.__class__()
result._list[:] = self._list[key]
result._set = set(result._list)
result.key = self.key
return result
elif isinstance(key, (Record, RecordTemplate, dict, tuple)):
index = self.index(key)
return self._get_record(*self._list[index])
else:
raise TypeError('%r should be an int, slice, record, record template, tuple, or dict -- not a %r' % (key, type(key)))
def __iter__(self):
self._still_valid_check()
return Iter(self)
def __len__(self):
self._still_valid_check()
return len(self._list)
def __bool__(self):
self._still_valid_check()
return len(self) > 0
def __radd__(self, other):
self._still_valid_check()
key = self.key
if isinstance(other, (Table, list)):
other = self.__class__(other, key=key)
if isinstance(other, self.__class__):
other._still_valid_check()
result = other.__class__()
result._set = other._set.copy()
result._list[:] = other._list[:]
result._tables = {}
result._tables.update(self._tables)
result.key = other.key
if key is other.key: # same key? just compare key values
for item in self._list:
result._maybe_add(item)
else: # different keys, use this list's key on other's records
for rec in self:
result._maybe_add((source_table(rec), recno(rec), key(rec)))
return result
return NotImplemented
def __repr__(self):
self._still_valid_check()
if self._desc:
return "%s(key=(%s), desc=%s)" % (self.__class__, self.key.__doc__, self._desc)
else:
return "%s(key=(%s))" % (self.__class__, self.key.__doc__)
def __rsub__(self, other):
self._still_valid_check()
key = self.key
if isinstance(other, (Table, list)):
other = self.__class__(other, key=key)
if isinstance(other, self.__class__):
other._still_valid_check()
result = other.__class__()
result._list[:] = other._list[:]
result._set = other._set.copy()
result._tables = {}
result._tables.update(other._tables)
result.key = key
lost = set()
if key is other.key:
for item in self._list:
if item[2] in result._list:
result._set.remove(item[2])
lost.add(item)
else:
for rec in self:
value = key(rec)
if value in result._set:
result._set.remove(value)
lost.add((source_table(rec), recno(rec), value))
result._list = [item for item in result._list if item not in lost]
lost = set(result._tables.keys())
for table, _1, _2 in result._list:
if table in result._tables:
lost.remove(table)
if not lost:
break
for table in lost:
del result._tables[table]
return result
return NotImplemented
def __sub__(self, other):
self._still_valid_check()
key = self.key
if isinstance(other, (Table, list)):
other = self.__class__(other, key=key)
if isinstance(other, self.__class__):
other._still_valid_check()
result = self.__class__()
result._list[:] = self._list[:]
result._set = self._set.copy()
result._tables = {}
result._tables.update(self._tables)
result.key = key
lost = set()
if key is other.key:
for item in other._list:
if item[2] in result._set:
result._set.remove(item[2])
lost.add(item[2])
else:
for rec in other:
value = key(rec)
if value in result._set:
result._set.remove(value)
lost.add(value)
result._list = [item for item in result._list if item[2] not in lost]
lost = set(result._tables.keys())
for table, _1, _2 in result._list:
if table in result._tables:
lost.remove(table)
if not lost:
break
for table in lost:
del result._tables[table]
return result
return NotImplemented
def _maybe_add(self, item):
self._still_valid_check()
table, recno, key = item
self._tables[table] = table._pack_count # TODO: check that _pack_count is the same if already in table
if key not in self._set:
self._set.add(key)
self._list.append(item)
def _get_record(self, table=None, rec_no=None, value=None):
if table is rec_no is None:
table, rec_no, value = self._list[self._index]
return table[rec_no]
def _purge(self, record, old_record_number, offset):
partial = source_table(record), old_record_number
records = sorted(self._list, key=lambda item: (item[0], item[1]))
for item in records:
if partial == item[:2]:
found = True
break
elif partial[0] is item[0] and partial[1] < item[1]:
found = False
break
else:
found = False
if found:
self._list.pop(self._list.index(item))
self._set.remove(item[2])
start = records.index(item) + found
for item in records[start:]:
if item[0] is not partial[0]: # into other table's records
break
i = self._list.index(item)
self._set.remove(item[2])
item = item[0], (item[1] - offset), item[2]
self._list[i] = item
self._set.add(item[2])
return found
def _still_valid_check(self):
for table, last_pack in self._tables.items():
if last_pack != getattr(table, '_pack_count'):
raise DbfError("table has been packed; list is invalid")
_nav_check = _still_valid_check
def append(self, record):
self._still_valid_check()
self._maybe_add((source_table(record), recno(record), self.key(record)))
def clear(self):
self._list = []
self._set = set()
self._index = -1
self._tables.clear()
def extend(self, records):
self._still_valid_check()
key = self.key
if isinstance(records, self.__class__):
if key is records.key: # same key? just compare key values
for item in records._list:
self._maybe_add(item)
else: # different keys, use this list's key on other's records
for rec in records:
value = key(rec)
self._maybe_add((source_table(rec), recno(rec), value))
else:
for rec in records:
value = key(rec)
self._maybe_add((source_table(rec), recno(rec), value))
def index(self, record, start=None, stop=None):
"""
returns the index of record between start and stop
start and stop default to the first and last record
"""
if not isinstance(record, (Record, RecordTemplate, dict, tuple)):
raise TypeError("x should be a record, template, dict, or tuple, not %r" % type(record))
self._still_valid_check()
if start is None:
start = 0
if stop is None:
stop = len(self)
for i in range(start, stop):
if record == (self[i]):
return i
else:
raise NotFoundError("dbf.List.index(x): x not in List", data=record)
def insert(self, i, record):
self._still_valid_check()
item = source_table(record), recno(record), self.key(record)
if item not in self._set:
self._set.add(item[2])
self._list.insert(i, item)
def key(self, record):
"""
table_name, record_number
"""
self._still_valid_check()
return source_table(record), recno(record)
def pop(self, index=None):
self._still_valid_check()
if index is None:
table, recno, value = self._list.pop()
else:
table, recno, value = self._list.pop(index)
self._set.remove(value)
return self._get_record(table, recno, value)
def query(self, criteria):
"""
criteria is a callback that returns a truthy value for matching record
"""
return pql(self, criteria)
def remove(self, data):
self._still_valid_check()
if not isinstance(data, (Record, RecordTemplate, dict, tuple)):
raise TypeError("%r(%r) is not a record, template, tuple, nor dict" % (type(data), data))
index = self.index(data)
record = self[index]
item = source_table(record), recno(record), self.key(record)
self._list.remove(item)
self._set.remove(item[2])
def reverse(self):
self._still_valid_check()
return self._list.reverse()
def sort(self, key=None, reverse=False):
self._still_valid_check()
if key is None:
return self._list.sort(reverse=reverse)
return self._list.sort(key=lambda item: key(item[0][item[1]]), reverse=reverse)
class Index(_Navigation):
"""
non-persistent index for a table
"""
def __init__(self, table, key):
self._table = table
self._values = [] # ordered list of values
self._rec_by_val = [] # matching record numbers
self._records = {} # record numbers:values
self.__doc__ = key.__doc__ or 'unknown'
self._key = key
self._previous_status = []
for record in table:
value = key(record)
if value is DoNotIndex:
continue
rec_num = recno(record)
if not isinstance(value, tuple):
value = (value, )
vindex = bisect_right(self._values, value)
self._values.insert(vindex, value)
self._rec_by_val.insert(vindex, rec_num)
self._records[rec_num] = value
table._indexen.add(self)
def __call__(self, record):
rec_num = recno(record)
key = self.key(record)
if rec_num in self._records:
if self._records[rec_num] == key:
return
old_key = self._records[rec_num]
vindex = bisect_left(self._values, old_key)
self._values.pop(vindex)
self._rec_by_val.pop(vindex)
del self._records[rec_num]
assert rec_num not in self._records
if key == (DoNotIndex, ):
return
vindex = bisect_right(self._values, key)
self._values.insert(vindex, key)
self._rec_by_val.insert(vindex, rec_num)
self._records[rec_num] = key
def __contains__(self, data):
if not isinstance(data, (Record, RecordTemplate, tuple, dict)):
raise TypeError("%r is not a record, templace, tuple, nor dict" % (data, ))
try:
value = self.key(data)
return value in self._values
except Exception:
for record in self:
if record == data:
return True
return False
def __getitem__(self, key):
'''if key is an integer, returns the matching record;
if key is a [slice | string | tuple | record] returns a List;
raises NotFoundError on failure'''
if isinstance(key, baseinteger):
count = len(self._values)
if not -count <= key < count:
raise NotFoundError("Record %d is not in list." % key)
rec_num = self._rec_by_val[key]
return self._table[rec_num]
elif isinstance(key, slice):
result = List()
start, stop, step = key.start, key.stop, key.step
if start is None: start = 0
if stop is None: stop = len(self._rec_by_val)
if step is None: step = 1
if step < 0:
start, stop = stop - 1, -(stop - start + 1)
for loc in range(start, stop, step):
record = self._table[self._rec_by_val[loc]]
result._maybe_add(item=(self._table, self._rec_by_val[loc], result.key(record)))
return result
elif isinstance (key, (basestring, tuple, Record, RecordTemplate)):
if isinstance(key, (Record, RecordTemplate)):
key = self.key(key)
elif isinstance(key, basestring):
key = (key, )
lo = self._search(key, where='left')
hi = self._search(key, where='right')
if lo == hi:
raise NotFoundError(key)
result = List(desc='match = %r' % (key, ))
for loc in range(lo, hi):
record = self._table[self._rec_by_val[loc]]
result._maybe_add(item=(self._table, self._rec_by_val[loc], result.key(record)))
return result
else:
raise TypeError('indices must be integers, match objects must by strings or tuples')
def __enter__(self):
self._table.__enter__()
return self
def __exit__(self, *exc_info):
self._table.__exit__()
return False
def __iter__(self):
return Iter(self)
def __len__(self):
return len(self._records)
def _clear(self):
"""
removes all entries from index
"""
self._values[:] = []
self._rec_by_val[:] = []
self._records.clear()
def _key(self, record):
"""
table_name, record_number
"""
self._still_valid_check()
return source_table(record), recno(record)
def _nav_check(self):
"""
raises error if table is closed
"""
if self._table._meta.status == CLOSED:
raise DbfError('indexed table %s is closed' % self.filename)
def _partial_match(self, target, match):
target = target[:len(match)]
if isinstance(match[-1], basestring):
target = list(target)
target[-1] = target[-1][:len(match[-1])]
target = tuple(target)
return target == match
def _purge(self, rec_num):
value = self._records.get(rec_num)
if value is not None:
vindex = bisect_left(self._values, value)
del self._records[rec_num]
self._values.pop(vindex)
self._rec_by_val.pop(vindex)
def _reindex(self):
"""
reindexes all records
"""
for record in self._table:
self(record)
def _search(self, match, lo=0, hi=None, where=None):
if hi is None:
hi = len(self._values)
if where == 'left':
return bisect_left(self._values, match, lo, hi)
elif where == 'right':
return bisect_right(self._values, match, lo, hi)
def index(self, record, start=None, stop=None):
"""
returns the index of record between start and stop
start and stop default to the first and last record
"""
if not isinstance(record, (Record, RecordTemplate, dict, tuple)):
raise TypeError("x should be a record, template, dict, or tuple, not %r" % type(record))
self._nav_check()
if start is None:
start = 0
if stop is None:
stop = len(self)
for i in range(start, stop):
if record == (self[i]):
return i
else:
raise NotFoundError("dbf.Index.index(x): x not in Index", data=record)
def index_search(self, match, start=None, stop=None, nearest=False, partial=False):
"""
returns the index of match between start and stop
start and stop default to the first and last record.
if nearest is true returns the location of where the match should be
otherwise raises NotFoundError
"""
self._nav_check()
if not isinstance(match, tuple):
match = (match, )
if start is None:
start = 0
if stop is None:
stop = len(self)
loc = self._search(match, start, stop, where='left')
if loc == len(self._values):
if nearest:
return IndexLocation(loc, False)
raise NotFoundError("dbf.Index.index_search(x): x not in index", data=match)
if self._values[loc] == match \
or partial and self._partial_match(self._values[loc], match):
return IndexLocation(loc, True)
elif nearest:
return IndexLocation(loc, False)
else:
raise NotFoundError("dbf.Index.index_search(x): x not in Index", data=match)
def key(self, record):
result = self._key(record)
if not isinstance(result, tuple):
result = (result, )
return result
def query(self, criteria):
"""
criteria is a callback that returns a truthy value for matching record
"""
self._nav_check()
return pql(self, criteria)
def search(self, match, partial=False):
"""
returns dbf.List of all (partially) matching records
"""
self._nav_check()
result = List()
if not isinstance(match, tuple):
match = (match, )
loc = self._search(match, where='left')
if loc == len(self._values):
return result
while loc < len(self._values) and self._values[loc] == match:
record = self._table[self._rec_by_val[loc]]
result._maybe_add(item=(self._table, self._rec_by_val[loc], result.key(record)))
loc += 1
if partial:
while loc < len(self._values) and self._partial_match(self._values[loc], match):
record = self._table[self._rec_by_val[loc]]
result._maybe_add(item=(self._table, self._rec_by_val[loc], result.key(record)))
loc += 1
return result
class Relation(object):
"""
establishes a relation between two dbf tables (not persistent)
"""
relations = {}
def __new__(cls, src, tgt, src_names=None, tgt_names=None):
if (len(src) != 2 or len(tgt) != 2):
raise DbfError("Relation should be called with ((src_table, src_field), (tgt_table, tgt_field))")
if src_names and len(src_names) !=2 or tgt_names and len(tgt_names) != 2:
raise DbfError('src_names and tgt_names, if specified, must be ("table","field")')
src_table, src_field = src
tgt_table, tgt_field = tgt
try:
if isinstance(src_field, baseinteger):
table, field = src_table, src_field
src_field = table.field_names[field]
else:
src_table.field_names.index(src_field)
if isinstance(tgt_field, baseinteger):
table, field = tgt_table, tgt_field
tgt_field = table.field_names[field]
else:
tgt_table.field_names.index(tgt_field)
except (IndexError, ValueError):
raise DbfError('%r not in %r' % (field, table)) from None
if src_names:
src_table_name, src_field_name = src_names
else:
src_table_name, src_field_name = src_table.filename, src_field
if src_table_name[-4:].lower() == '.dbf':
src_table_name = src_table_name[:-4]
if tgt_names:
tgt_table_name, tgt_field_name = tgt_names
else:
tgt_table_name, tgt_field_name = tgt_table.filename, tgt_field
if tgt_table_name[-4:].lower() == '.dbf':
tgt_table_name = tgt_table_name[:-4]
relation = cls.relations.get(((src_table, src_field), (tgt_table, tgt_field)))
if relation is not None:
return relation
obj = object.__new__(cls)
obj._src_table, obj._src_field = src_table, src_field
obj._tgt_table, obj._tgt_field = tgt_table, tgt_field
obj._src_table_name, obj._src_field_name = src_table_name, src_field_name
obj._tgt_table_name, obj._tgt_field_name = tgt_table_name, tgt_field_name
obj._tables = dict()
cls.relations[((src_table, src_field), (tgt_table, tgt_field))] = obj
return obj
def __eq__(yo, other):
if (yo.src_table == other.src_table
and yo.src_field == other.src_field
and yo.tgt_table == other.tgt_table
and yo.tgt_field == other.tgt_field):
return True
return False
def __getitem__(yo, record):
"""
record should be from the source table
"""
key = (record[yo.src_field], )
try:
return yo.index[key]
except NotFoundError:
return List(desc='%s not found' % key)
def __hash__(yo):
return hash((yo.src_table, yo.src_field, yo.tgt_table, yo.tgt_field))
def __ne__(yo, other):
if (yo.src_table != other.src_table
or yo.src_field != other.src_field
or yo.tgt_table != other.tgt_table
or yo.tgt_field != other.tgt_field):
return True
return False
def __repr__(yo):
return "Relation((%r, %r), (%r, %r))" % (yo.src_table_name, yo.src_field, yo.tgt_table_name, yo.tgt_field)
def __str__(yo):
return "%s:%s --> %s:%s" % (yo.src_table_name, yo.src_field_name, yo.tgt_table_name, yo.tgt_field_name)
@property
def src_table(yo):
"name of source table"
return yo._src_table
@property
def src_field(yo):
"name of source field"
return yo._src_field
@property
def src_table_name(yo):
return yo._src_table_name
@property
def src_field_name(yo):
return yo._src_field_name
@property
def tgt_table(yo):
"name of target table"
return yo._tgt_table
@property
def tgt_field(yo):
"name of target field"
return yo._tgt_field
@property
def tgt_table_name(yo):
return yo._tgt_table_name
@property
def tgt_field_name(yo):
return yo._tgt_field_name
@LazyAttr
def index(yo):
def index(record, field=yo._tgt_field):
return record[field]
index.__doc__ = "%s:%s --> %s:%s" % (yo.src_table_name, yo.src_field_name, yo.tgt_table_name, yo.tgt_field_name)
yo.index = yo._tgt_table.create_index(index)
source = dbf.List(yo._src_table, key=lambda rec, field=yo._src_field: rec[field])
target = dbf.List(yo._tgt_table, key=lambda rec, field=yo._tgt_field: rec[field])
if len(source) != len(yo._src_table):
yo._tables[yo._src_table] = 'many'
else:
yo._tables[yo._src_table] = 'one'
if len(target) != len(yo._tgt_table):
yo._tables[yo._tgt_table] = 'many'
else:
yo._tables[yo._tgt_table] = 'one'
return yo.index
def one_or_many(yo, table):
yo.index # make sure yo._tables has been populated
try:
if isinstance(table, basestring):
table = (yo._src_table, yo._tgt_table)[yo._tgt_table_name == table]
return yo._tables[table]
except IndexError:
raise NotFoundError("table %s not in relation" % table) from None
class IndexFile(_Navigation):
pass
# table meta
table_types = {
'db3' : Db3Table,
'clp' : ClpTable,
'fp' : FpTable,
'vfp' : VfpTable,
}
version_map = {
0x02 : 'FoxBASE',
0x03 : 'dBase III Plus',
0x04 : 'dBase IV',
0x05 : 'dBase V',
0x30 : 'Visual FoxPro',
0x31 : 'Visual FoxPro (auto increment field)',
0x32 : 'Visual FoxPro (VarChar, VarBinary, or BLOB enabled)',
0x43 : 'dBase IV SQL table files',
0x63 : 'dBase IV SQL system files',
0x83 : 'dBase III Plus w/memos',
0x8b : 'dBase IV w/memos',
0x8e : 'dBase IV w/SQL table',
0xf5 : 'FoxPro w/memos'}
code_pages = {
0x00 : ('ascii', "plain ol' ascii"),
0x01 : ('cp437', 'U.S. MS-DOS'),
0x02 : ('cp850', 'International MS-DOS'),
0x03 : ('cp1252', 'Windows ANSI'),
0x04 : ('mac_roman', 'Standard Macintosh'),
0x08 : ('cp865', 'Danish OEM'),
0x09 : ('cp437', 'Dutch OEM'),
0x0A : ('cp850', 'Dutch OEM (secondary)'),
0x0B : ('cp437', 'Finnish OEM'),
0x0D : ('cp437', 'French OEM'),
0x0E : ('cp850', 'French OEM (secondary)'),
0x0F : ('cp437', 'German OEM'),
0x10 : ('cp850', 'German OEM (secondary)'),
0x11 : ('cp437', 'Italian OEM'),
0x12 : ('cp850', 'Italian OEM (secondary)'),
0x13 : ('cp932', 'Japanese Shift-JIS'),
0x14 : ('cp850', 'Spanish OEM (secondary)'),
0x15 : ('cp437', 'Swedish OEM'),
0x16 : ('cp850', 'Swedish OEM (secondary)'),
0x17 : ('cp865', 'Norwegian OEM'),
0x18 : ('cp437', 'Spanish OEM'),
0x19 : ('cp437', 'English OEM (Britain)'),
0x1A : ('cp850', 'English OEM (Britain) (secondary)'),
0x1B : ('cp437', 'English OEM (U.S.)'),
0x1C : ('cp863', 'French OEM (Canada)'),
0x1D : ('cp850', 'French OEM (secondary)'),
0x1F : ('cp852', 'Czech OEM'),
0x22 : ('cp852', 'Hungarian OEM'),
0x23 : ('cp852', 'Polish OEM'),
0x24 : ('cp860', 'Portugese OEM'),
0x25 : ('cp850', 'Potugese OEM (secondary)'),
0x26 : ('cp866', 'Russian OEM'),
0x37 : ('cp850', 'English OEM (U.S.) (secondary)'),
0x40 : ('cp852', 'Romanian OEM'),
0x4D : ('cp936', 'Chinese GBK (PRC)'),
0x4E : ('cp949', 'Korean (ANSI/OEM)'),
0x4F : ('cp950', 'Chinese Big 5 (Taiwan)'),
0x50 : ('cp874', 'Thai (ANSI/OEM)'),
0x57 : ('cp1252', 'ANSI'),
0x58 : ('cp1252', 'Western European ANSI'),
0x59 : ('cp1252', 'Spanish ANSI'),
0x64 : ('cp852', 'Eastern European MS-DOS'),
0x65 : ('cp866', 'Russian MS-DOS'),
0x66 : ('cp865', 'Nordic MS-DOS'),
0x67 : ('cp861', 'Icelandic MS-DOS'),
0x68 : (None, 'Kamenicky (Czech) MS-DOS'),
0x69 : (None, 'Mazovia (Polish) MS-DOS'),
0x6a : ('cp737', 'Greek MS-DOS (437G)'),
0x6b : ('cp857', 'Turkish MS-DOS'),
0x78 : ('cp950', 'Traditional Chinese (Hong Kong SAR, Taiwan) Windows'),
0x79 : ('cp949', 'Korean Windows'),
0x7a : ('cp936', 'Chinese Simplified (PRC, Singapore) Windows'),
0x7b : ('cp932', 'Japanese Windows'),
0x7c : ('cp874', 'Thai Windows'),
0x7d : ('cp1255', 'Hebrew Windows'),
0x7e : ('cp1256', 'Arabic Windows'),
0xc8 : ('cp1250', 'Eastern European Windows'),
0xc9 : ('cp1251', 'Russian Windows'),
0xca : ('cp1254', 'Turkish Windows'),
0xcb : ('cp1253', 'Greek Windows'),
0x96 : ('mac_cyrillic', 'Russian Macintosh'),
0x97 : ('mac_latin2', 'Macintosh EE'),
0x98 : ('mac_greek', 'Greek Macintosh'),
0xf0 : ('utf8', '8-bit unicode'),
}
default_codepage = code_pages.get(default_codepage, code_pages.get(0x00))[0]
def _nop(value):
"""
returns parameter unchanged
"""
return value
def _normalize_tuples(tuples, length, filler):
"""
ensures each tuple is the same length, using filler[-missing] for the gaps
"""
final = []
for t in tuples:
if len(t) < length:
final.append( tuple([item for item in t] + filler[len(t)-length:]) )
else:
final.append(t)
return tuple(final)
def _codepage_lookup(cp):
if cp not in code_pages:
for code_page in sorted(code_pages.keys()):
sd, ld = code_pages[code_page]
if cp == sd or cp == ld:
if sd is None:
raise DbfError("Unsupported codepage: %s" % ld)
cp = code_page
break
else:
raise DbfError("Unsupported codepage: %s" % cp)
sd, ld = code_pages[cp]
return cp, sd, ld
# miscellany
class _Db4Table(Table):
"""
under development
"""
version = 'dBase IV w/memos (non-functional)'
_versionabbr = 'db4'
@MutableDefault
def _field_types():
return {
CHAR: {'Type':'Character', 'Retrieve':retrieve_character, 'Update':update_character, 'Blank':lambda x: b' ' * x, 'Init':add_vfp_character},
CURRENCY: {'Type':'Currency', 'Retrieve':retrieve_currency, 'Update':update_currency, 'Blank':Decimal, 'Init':add_vfp_currency},
DOUBLE: {'Type':'Double', 'Retrieve':retrieve_double, 'Update':update_double, 'Blank':float, 'Init':add_vfp_double},
FLOAT: {'Type':'Float', 'Retrieve':retrieve_numeric, 'Update':update_numeric, 'Blank':float, 'Init':add_vfp_numeric},
NUMERIC: {'Type':'Numeric', 'Retrieve':retrieve_numeric, 'Update':update_numeric, 'Blank':int, 'Init':add_vfp_numeric},
INTEGER: {'Type':'Integer', 'Retrieve':retrieve_integer, 'Update':update_integer, 'Blank':int, 'Init':add_vfp_integer},
LOGICAL: {'Type':'Logical', 'Retrieve':retrieve_logical, 'Update':update_logical, 'Blank':Logical, 'Init':add_logical},
DATE: {'Type':'Date', 'Retrieve':retrieve_date, 'Update':update_date, 'Blank':Date, 'Init':add_date},
DATETIME: {'Type':'DateTime', 'Retrieve':retrieve_vfp_datetime, 'Update':update_vfp_datetime, 'Blank':DateTime, 'Init':add_vfp_datetime},
MEMO: {'Type':'Memo', 'Retrieve':retrieve_memo, 'Update':update_memo, 'Blank':lambda x: b' ' * x, 'Init':add_memo},
GENERAL: {'Type':'General', 'Retrieve':retrieve_memo, 'Update':update_memo, 'Blank':lambda x: b' ' * x, 'Init':add_memo},
PICTURE: {'Type':'Picture', 'Retrieve':retrieve_memo, 'Update':update_memo, 'Blank':lambda x: b' ' * x, 'Init':add_memo},
_NULLFLAG: {'Type':'_NullFlags', 'Retrieve':unsupported_type, 'Update':unsupported_type, 'Blank':int, 'Init':None} }
_memoext = '.dbt'
_memotypes = ('G', 'M', 'P')
_memoClass = _VfpMemo
_yesMemoMask = 0x8b # 0011 0000
_noMemoMask = 0x04 # 0011 0000
_fixed_fields = ('B', 'D', 'G', 'I', 'L', 'M', 'P', 'T', 'Y')
_variable_fields = ('C', 'F', 'N')
_binary_fields = ('G', 'P')
_character_fields = ('C', 'M') # field representing character data
_decimal_fields = ('F', 'N')
_numeric_fields = ('B', 'F', 'I', 'N', 'Y')
_currency_fields = ('Y',)
_supported_tables = (0x04, 0x8b)
_dbfTableHeader = [0] * 32
_dbfTableHeader[0] = 0x8b # version - Foxpro 6 0011 0000
_dbfTableHeader[10] = 0x01 # record length -- one for delete flag
_dbfTableHeader[29] = 0x03 # code page -- 437 US-MS DOS
_dbfTableHeader = bytes(_dbfTableHeader)
_dbfTableHeaderExtra = b''
def _check_memo_integrity(self):
"""
dBase IV specific
"""
if self._meta.header.version == 0x8b:
try:
self._meta.memo = self._memoClass(self._meta)
except:
self._meta.dfd.close()
self._meta.dfd = None
raise
if not self._meta.ignorememos:
for field in self._meta.fields:
if self._meta[field][TYPE] in self._memotypes:
if self._meta.header.version != 0x8b:
self._meta.dfd.close()
self._meta.dfd = None
raise BadDataError("Table structure corrupt: memo fields exist, header declares no memos")
elif not os.path.exists(self._meta.memoname):
self._meta.dfd.close()
self._meta.dfd = None
raise BadDataError("Table structure corrupt: memo fields exist without memo file")
break
# utility functions
def create_template(table_or_record, defaults=None):
if isinstance(table_or_record, Table):
return RecordTemplate(table_or_record._meta, defaults)
else:
return RecordTemplate(table_or_record._meta, table_or_record, defaults)
def delete(record):
"""
marks record as deleted
"""
template = isinstance(record, RecordTemplate)
if not template and record._meta.status == CLOSED:
raise DbfError("%s is closed; cannot delete record" % record._meta.filename)
record_in_flux = not record._write_to_disk
if not template and not record_in_flux:
record._start_flux()
try:
record._data[0] = ASTERISK
if not template:
record._dirty = True
except:
if not template and not record_in_flux:
record._rollback_flux()
raise
if not template and not record_in_flux:
record._commit_flux()
def export(table_or_records, filename=None, field_names=None, format='csv', header=True, dialect='dbf', encoding=None):
"""
writes the records using CSV or tab-delimited format, using the filename
given if specified, otherwise the table name
if table_or_records is a collection of records (not an actual table) they
should all be of the same format
"""
table = source_table(table_or_records[0])
if filename is None:
filename = table.filename
if field_names is None:
field_names = table.field_names
if isinstance(field_names, basestring):
field_names = [f.strip() for f in field_names.split(',')]
format = format.lower()
if format not in ('csv', 'tab', 'fixed'):
raise DbfError("export format: csv, tab, or fixed -- not %s" % format)
if format == 'fixed':
format = 'txt'
if encoding is None:
encoding = table.codepage.name
encoder = codecs.getencoder(encoding)
header_names = field_names
base, ext = os.path.splitext(filename)
if ext.lower() in ('', '.dbf'):
filename = base + "." + format
try:
if format == 'csv':
fd = open(filename, 'w', encoding=encoding)
csvfile = csv.writer(fd, dialect=dialect)
if header:
csvfile.writerow(header_names)
for record in table_or_records:
fields = []
for fieldname in field_names:
data = record[fieldname]
# if isinstance(data, str):
# fields.append(encoder(data)[0])
# else:
fields.append(data)
csvfile.writerow(fields)
elif format == 'tab':
fd = open(filename, 'w', encoding=encoding)
if header:
fd.write('\t'.join(header_names) + '\n')
for record in table_or_records:
fields = []
for fieldname in field_names:
data = record[fieldname]
# if isinstance(data, str):
# fields.append(encoder(data)[0])
# else:
fields.append(str(data))
fd.write('\t'.join(fields) + '\n')
else: # format == 'fixed'
fd = open(filename, 'w', encoding=encoding)
header = open("%s_layout.txt" % os.path.splitext(filename)[0], 'w', encoding=encoding)
header.write("%-15s Size\n" % "Field Name")
header.write("%-15s ----\n" % ("-" * 15))
sizes = []
for field in field_names:
size = table.field_info(field).length
sizes.append(size)
# field = encoder(field)[0]
header.write("%-15s %3d\n" % (field, size))
header.write('\nTotal Records in file: %d\n' % len(table_or_records))
header.close()
for record in table_or_records:
fields = []
for i, fieldname in enumerate(field_names):
data = record[fieldname]
# if isinstance(data, str):
# fields.append("%-*s" % (sizes[i], encoder(data)[0]))
# else:
fields.append("%-*s" % (sizes[i], data))
fd.write(''.join(fields) + '\n')
finally:
fd.close()
fd = None
return len(table_or_records)
def field_names(thing):
"""
fields in table/record, keys in dict
"""
if isinstance(thing, dict):
return list(thing.keys())
elif isinstance(thing, (Table, Record, RecordTemplate)):
return thing._meta.user_fields[:]
elif isinstance(thing, Index):
return thing._table._meta.user_fields[:]
else:
for record in thing: # grab any record
return record._meta.user_fields[:]
def is_deleted(record):
"""
marked for deletion?
"""
return record._data[0] == ASTERISK
def recno(record):
"""
physical record number
"""
return record._recnum
def reset(record, keep_fields=None):
"""
sets record's fields back to original, except for fields in keep_fields
"""
template = record_in_flux = False
if isinstance(record, RecordTemplate):
template = True
else:
record_in_flux = not record._write_to_disk
if record._meta.status == CLOSED:
raise DbfError("%s is closed; cannot modify record" % record._meta.filename)
if keep_fields is None:
keep_fields = []
keep = {}
for field in keep_fields:
keep[field] = record[field]
record._data[:] = record._meta.blankrecord[:]
for field in keep_fields:
record[field] = keep[field]
if not template:
if record._write_to_disk:
record._write()
else:
record._dirty = True
def source_table(thingie):
"""
table associated with table | record | index
"""
table = thingie._meta.table()
if table is None:
raise DbfError("table is no longer available")
return table
def undelete(record):
"""
marks record as active
"""
template = isinstance(record, RecordTemplate)
if not template and record._meta.status == CLOSED:
raise DbfError("%s is closed; cannot undelete record" % record._meta.filename)
record_in_flux = not record._write_to_disk
if not template and not record_in_flux:
record._start_flux()
try:
record._data[0] = SPACE
if not template:
record._dirty = True
except:
if not template and not record_in_flux:
record._rollback_flux()
raise
if not template and not record_in_flux:
record._commit_flux()
def write(record, **kwargs):
"""
write record data to disk (updates indices)
"""
if record._meta.status == CLOSED:
raise DbfError("%s is closed; cannot update record" % record._meta.filename)
elif not record._write_to_disk:
raise DbfError("unable to use .write_record() while record is in flux")
if kwargs:
gather(record, kwargs)
if record._dirty:
record._write()
def Process(records, start=0, stop=None, filter=None):
"""commits each record to disk before returning the next one; undoes all changes to that record if exception raised
if records is a table, it will be opened and closed if necessary
filter function should return True to skip record, False to keep"""
already_open = True
if isinstance(records, Table):
already_open = records.status != CLOSED
if not already_open:
records.open()
try:
if stop is None:
stop = len(records)
for record in records[start:stop]:
if filter is not None and filter(record):
continue
try:
record._start_flux()
yield record
except:
record._rollback_flux()
raise
else:
record._commit_flux()
finally:
if not already_open:
records.close()
def Templates(records, start=0, stop=None, filter=None):
"""
returns a template of each record instead of the record itself
if records is a table, it will be opened and closed if necessary
"""
already_open = True
if isinstance(records, Table):
already_open = records.status != CLOSED
if not already_open:
records.open()
try:
if stop is None:
stop = len(records)
for record in records[start:stop]:
if filter is not None and filter(record):
continue
yield(create_template(record))
finally:
if not already_open:
records.close()
def index(sequence):
"""
returns integers 0 - len(sequence)
"""
for i in range(len(sequence)):
yield i
def guess_table_type(filename):
reported = table_type(filename)
possibles = []
version = reported[0]
for tabletype in (Db3Table, ClpTable, FpTable, VfpTable):
if version in tabletype._supported_tables:
possibles.append((tabletype._versionabbr, tabletype._version, tabletype))
if not possibles:
raise DbfError("Tables of type %s not supported" % str(reported))
return possibles
def table_type(filename):
"""
returns text representation of a table's dbf version
"""
base, ext = os.path.splitext(filename)
if ext == '':
filename = base + '.[Dd][Bb][Ff]'
matches = glob(filename)
if matches:
filename = matches[0]
else:
filename = base + '.dbf'
if not os.path.exists(filename):
raise DbfError('File %s not found' % filename)
fd = open(filename, 'rb')
version = fd.read(1)
if version:
[version] = version
fd.close()
fd = None
if not version in version_map:
raise DbfError("Unknown dbf type: %s (%x)" % (version, version))
return version, version_map[version]
def add_fields(table_name, field_specs):
"""
adds fields to an existing table
"""
table = Table(table_name)
table.open()
try:
table.add_fields(field_specs)
finally:
table.close()
def delete_fields(table_name, field_names):
"""
deletes fields from an existing table
"""
table = Table(table_name)
table.open()
try:
table.delete_fields(field_names)
finally:
table.close()
def first_record(table_name):
"""
prints the first record of a table
"""
table = Table(table_name)
table.open()
try:
print(str(table[0]))
finally:
table.close()
def from_csv(csvfile, to_disk=False, filename=None, field_names=None, extra_fields=None,
dbf_type='db3', memo_size=64, min_field_size=1,
encoding=None, errors=None):
"""
creates a Character table from a csv file
to_disk will create a table with the same name
filename will be used if provided
field_names default to f0, f1, f2, etc, unless specified (list)
extra_fields can be used to add additional fields -- should be normal field specifiers (list)
"""
with codecs.open(csvfile, 'r', encoding='latin-1', errors=errors) as fd:
reader = csv.reader(fd)
if field_names:
if isinstance(field_names, basestring):
field_names = field_names.split()
if ' ' not in field_names[0]:
field_names = ['%s M' % fn for fn in field_names]
else:
field_names = ['f0 M']
if filename:
to_disk = True
else:
filename = os.path.splitext(csvfile)[0]
if to_disk:
csv_table = Table(filename, [field_names[0]], dbf_type=dbf_type, memo_size=memo_size, codepage=encoding)
else:
csv_table = Table(':memory:', [field_names[0]], dbf_type=dbf_type, memo_size=memo_size, codepage=encoding, on_disk=False)
csv_table.open()
fields_so_far = 1
while reader:
try:
row = next(reader)
except UnicodeEncodeError:
row = ['']
except StopIteration:
break
while fields_so_far < len(row):
if fields_so_far == len(field_names):
field_names.append('f%d M' % fields_so_far)
csv_table.add_fields(field_names[fields_so_far])
fields_so_far += 1
csv_table.append(tuple(row))
if extra_fields:
csv_table.add_fields(extra_fields)
csv_table.close()
return csv_table
def get_fields(table_name):
"""
returns the list of field names of a table
"""
table = Table(table_name)
return table.field_names
def info(table_name):
"""
prints table info
"""
table = Table(table_name)
print(str(table))
def rename_field(table_name, oldfield, newfield):
"""
renames a field in a table
"""
table = Table(table_name)
try:
table.rename_field(oldfield, newfield)
finally:
table.close()
def structure(table_name, field=None):
"""
returns the definition of a field (or all fields)
"""
table = Table(table_name)
return table.structure(field)
def hex_dump(records):
"""
just what it says ;)
"""
for index, dummy in enumerate(records):
chars = dummy._data
print("%2d: " % (index,))
for char in chars[1:]:
print(" %2x " % (char,))
print()
# Foxpro functions
def gather(record, data, drop=False):
"""
saves data into a record's fields; writes to disk if not in flux
keys with no matching field will raise a FieldMissingError
exception unless drop_missing == True;
if an Exception occurs the record is restored before reraising
"""
if isinstance(record, Record) and record._meta.status == CLOSED:
raise DbfError("%s is closed; cannot modify record" % record._meta.filename)
record_in_flux = not record._write_to_disk
if not record_in_flux:
record._start_flux()
try:
record_fields = field_names(record)
for key in field_names(data):
value = data[key]
if not key in record_fields:
if drop:
continue
raise FieldMissingError(key)
record[key] = value
except:
if not record_in_flux:
record._rollback_flux()
raise
if not record_in_flux:
record._commit_flux()
def scan(table, direction='forward', filter=lambda rec: True):
"""
moves record pointer forward 1; returns False if Eof/Bof reached
table must be derived from _Navigation or have skip() method
"""
if direction not in ('forward', 'reverse'):
raise TypeError("direction should be 'forward' or 'reverse', not %r" % direction)
if direction == 'forward':
n = +1
no_more_records = Eof
else:
n = -1
no_more_records = Bof
try:
while True:
table.skip(n)
if filter(table.current_record):
return True
except no_more_records:
return False
def scatter(record, as_type=create_template, _mappings=getattr(collections, 'Mapping', dict)):
"""
returns as_type() of [fieldnames and] values.
"""
if isinstance(as_type, types.FunctionType):
return as_type(record)
elif issubclass(as_type, _mappings):
return as_type(zip(field_names(record), record))
else:
return as_type(record)
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