sh_cpl/src/cpl_query/base/queryable_abc.py
2023-04-04 13:33:45 +02:00

568 lines
14 KiB
Python

from typing import Optional, Callable, Union, Iterable, Self
from cpl_query._helper import is_number
from cpl_query.base.sequence import Sequence
from cpl_query.exceptions import (
InvalidTypeException,
ArgumentNoneException,
ExceptionArgument,
IndexOutOfRangeException,
)
def _default_lambda(x: object) -> object:
return x
class QueryableABC(Sequence):
def __init__(self, t: type, values: Iterable = None):
Sequence.__init__(self, t, values)
def all(self, _func: Callable = None) -> bool:
r"""Checks if every element of list equals result found by function
Parameter
---------
func: :class:`Callable`
selected value
Returns
-------
bool
"""
if _func is None:
_func = _default_lambda
return self.count(_func) == self.count()
def any(self, _func: Callable = None) -> bool:
r"""Checks if list contains result found by function
Parameter
---------
func: :class:`Callable`
selected value
Returns
-------
bool
"""
if _func is None:
_func = _default_lambda
return self.where(_func).count() > 0
def average(self, _func: Callable = None) -> Union[int, float, complex]:
r"""Returns average value of list
Parameter
---------
func: :class:`Callable`
selected value
Returns
-------
Union[int, float, complex]
"""
if _func is None and not is_number(self.type):
raise InvalidTypeException()
return self.sum(_func) / self.count()
def contains(self, _value: object) -> bool:
r"""Checks if list contains value given by function
Parameter
---------
value: :class:`object`
value
Returns
-------
bool
"""
if _value is None:
raise ArgumentNoneException(ExceptionArgument.value)
return self.where(lambda x: x == _value).count() > 0
def count(self, _func: Callable = None) -> int:
r"""Returns length of list or count of found elements
Parameter
---------
func: :class:`Callable`
selected value
Returns
-------
int
"""
if _func is None:
return self.__len__()
return self.where(_func).count()
def distinct(self, _func: Callable = None) -> Self:
r"""Returns list without redundancies
Parameter
---------
func: :class:`Callable`
selected value
Returns
-------
:class: `cpl_query.base.queryable_abc.QueryableABC`
"""
if _func is None:
_func = _default_lambda
result = []
known_values = []
for element in self:
value = _func(element)
if value in known_values:
continue
known_values.append(value)
result.append(element)
return type(self)(self._type, result)
def element_at(self, _index: int) -> any:
r"""Returns element at given index
Parameter
---------
_index: :class:`int`
index
Returns
-------
Value at _index: any
"""
if _index is None:
raise ArgumentNoneException(ExceptionArgument.index)
if _index < 0 or _index >= self.count():
raise IndexOutOfRangeException
result = self._values[_index]
if result is None:
raise IndexOutOfRangeException
return result
def element_at_or_default(self, _index: int) -> Optional[any]:
r"""Returns element at given index or None
Parameter
---------
_index: :class:`int`
index
Returns
-------
Value at _index: Optional[any]
"""
if _index is None:
raise ArgumentNoneException(ExceptionArgument.index)
try:
return self._values[_index]
except IndexError:
return None
def first(self) -> any:
r"""Returns first element
Returns
-------
First element of list: any
"""
if self.count() == 0:
raise IndexOutOfRangeException()
return self._values[0]
def first_or_default(self) -> any:
r"""Returns first element or None
Returns
-------
First element of list: Optional[any]
"""
if self.count() == 0:
return None
return self._values[0]
def for_each(self, _func: Callable = None):
r"""Runs given function for each element of list
Parameter
---------
func: :class: `Callable`
function to call
"""
if _func is not None:
for element in self:
_func(element)
return self
def group_by(self, _func: Callable = None) -> Self:
r"""Groups by func
Returns
-------
Grouped list[list[any]]: any
"""
if _func is None:
_func = _default_lambda
groups = {}
for v in self:
value = _func(v)
if v not in groups:
groups[value] = []
groups[value].append(v)
v = []
for g in groups.values():
v.append(type(self)(object, g))
x = type(self)(type(self), v)
return x
def last(self) -> any:
r"""Returns last element
Returns
-------
Last element of list: any
"""
if self.count() == 0:
raise IndexOutOfRangeException()
return self._values[self.count() - 1]
def last_or_default(self) -> any:
r"""Returns last element or None
Returns
-------
Last element of list: Optional[any]
"""
if self.count() == 0:
return None
return self._values[self.count() - 1]
def max(self, _func: Callable = None) -> object:
r"""Returns the highest value
Parameter
---------
func: :class:`Callable`
selected value
Returns
-------
object
"""
if _func is None and not is_number(self.type):
raise InvalidTypeException()
if _func is None:
_func = _default_lambda
return _func(max(self, key=_func))
def median(self, _func=None) -> Union[int, float]:
r"""Return the median value of data elements
Returns
-------
Union[int, float]
"""
if _func is None:
_func = _default_lambda
result = self.order_by(_func).select(_func).to_list()
length = len(result)
i = int(length / 2)
return result[i] if length % 2 == 1 else (float(result[i - 1]) + float(result[i])) / float(2)
def min(self, _func: Callable = None) -> object:
r"""Returns the lowest value
Parameter
---------
func: :class:`Callable`
selected value
Returns
-------
object
"""
if _func is None and not is_number(self.type):
raise InvalidTypeException()
if _func is None:
_func = _default_lambda
return _func(min(self, key=_func))
def order_by(self, _func: Callable = None) -> "OrderedQueryableABC":
r"""Sorts elements by function in ascending order
Parameter
---------
func: :class:`Callable`
selected value
Returns
-------
:class: `cpl_query.base.ordered_queryable_abc.OrderedQueryableABC`
"""
if _func is None:
_func = _default_lambda
from cpl_query.base.ordered_queryable import OrderedQueryable
return OrderedQueryable(self.type, sorted(self, key=_func), _func)
def order_by_descending(self, _func: Callable = None) -> "OrderedQueryableABC":
r"""Sorts elements by function in descending order
Parameter
---------
func: :class:`Callable`
selected value
Returns
-------
:class: `cpl_query.base.ordered_queryable_abc.OrderedQueryableABC`
"""
if _func is None:
_func = _default_lambda
from cpl_query.base.ordered_queryable import OrderedQueryable
return OrderedQueryable(self.type, sorted(self, key=_func, reverse=True), _func)
def reverse(self) -> Self:
r"""Reverses list
Returns
-------
:class: `cpl_query.base.queryable_abc.QueryableABC`
"""
return type(self)(self._type, reversed(self._values))
def select(self, _func: Callable) -> Self:
r"""Formats each element of list to a given format
Returns
-------
:class: `cpl_query.base.queryable_abc.QueryableABC`
"""
if _func is None:
_func = _default_lambda
return type(self)(object, [_func(_o) for _o in self])
def select_many(self, _func: Callable) -> Self:
r"""Flattens resulting lists to one
Returns
-------
:class: `cpl_query.base.queryable_abc.QueryableABC`
"""
# The line below is pain. I don't understand anything of it...
# written on 09.11.2022 by Sven Heidemann
return type(self)(object, [_a for _o in self for _a in _func(_o)])
def single(self) -> any:
r"""Returns one single element of list
Returns
-------
Found value: any
Raises
------
ArgumentNoneException: when argument is None
Exception: when argument is None or found more than one element
"""
if self.count() > 1:
raise Exception("Found more than one element")
elif self.count() == 0:
raise Exception("Found no element")
return self._values[0]
def single_or_default(self) -> Optional[any]:
r"""Returns one single element of list
Returns
-------
Found value: Optional[any]
"""
if self.count() > 1:
raise Exception("Index out of range")
elif self.count() == 0:
return None
return self._values[0]
def skip(self, _index: int) -> Self:
r"""Skips all elements from index
Parameter
---------
_index: :class:`int`
index
Returns
-------
:class: `cpl_query.base.queryable_abc.QueryableABC`
"""
if _index is None:
raise ArgumentNoneException(ExceptionArgument.index)
return type(self)(self.type, self._values[_index:])
def skip_last(self, _index: int) -> Self:
r"""Skips all elements after index
Parameter
---------
_index: :class:`int`
index
Returns
-------
:class: `cpl_query.base.queryable_abc.QueryableABC`
"""
if _index is None:
raise ArgumentNoneException(ExceptionArgument.index)
index = self.count() - _index
return type(self)(self._type, self._values[:index])
def sum(self, _func: Callable = None) -> Union[int, float, complex]:
r"""Sum of all values
Parameter
---------
func: :class:`Callable`
selected value
Returns
-------
Union[int, float, complex]
"""
if _func is None and not is_number(self.type):
raise InvalidTypeException()
if _func is None:
_func = _default_lambda
result = 0
for x in self:
result += _func(x)
return result
def split(self, _func: Callable) -> Self:
r"""Splits the list by given function
Parameter
---------
func: :class:`Callable`
seperator
Returns
-------
:class: `cpl_query.base.queryable_abc.QueryableABC`
"""
groups = []
group = []
for x in self:
v = _func(x)
if x == v:
groups.append(group)
group = []
group.append(x)
groups.append(group)
query_groups = []
for g in groups:
if len(g) == 0:
continue
query_groups.append(type(self)(self._type, g))
return type(self)(self._type, query_groups)
def take(self, _index: int) -> Self:
r"""Takes all elements from index
Parameter
---------
_index: :class:`int`
index
Returns
-------
:class: `cpl_query.base.queryable_abc.QueryableABC`
"""
if _index is None:
raise ArgumentNoneException(ExceptionArgument.index)
return type(self)(self._type, self._values[:_index])
def take_last(self, _index: int) -> Self:
r"""Takes all elements after index
Parameter
---------
_index: :class:`int`
index
Returns
-------
:class: `cpl_query.base.queryable_abc.QueryableABC`
"""
index = self.count() - _index
if index >= self.count() or index < 0:
raise IndexOutOfRangeException()
return type(self)(self._type, self._values[index:])
def where(self, _func: Callable = None) -> Self:
r"""Select element by function
Parameter
---------
func: :class:`Callable`
selected value
Returns
-------
:class: `cpl_query.base.queryable_abc.QueryableABC`
"""
if _func is None:
raise ArgumentNoneException(ExceptionArgument.func)
if _func is None:
_func = _default_lambda
return type(self)(self.type, filter(_func, self))