Refactored cpl-query Iterable & Enumerable #129

src/cpl_query/base/sequence_abc.py

@@ -0,0 +1,86 @@
+from abc import ABC, abstractmethod
+from itertools import islice
+
+from cpl_query.base.sequence_values import SequenceValues
+
+
+class SequenceABC(ABC):
+
+    @abstractmethod
+    def __init__(self, t: type = None, values: list = None):
+        ABC.__init__(self)
+        if values is None:
+            values = []
+
+        if t is None and len(values) > 0:
+            t = type(values[0])
+
+        if t is None:
+            t = any
+
+        self._type = t
+        self._set_values(values)
+
+    def __len__(self):
+        return len(self._values)
+
+    def __iter__(self):
+        return iter(self._values)
+
+    def next(self):
+        return next(self._values)
+
+    def __next__(self):
+        return self.next()
+
+    def __getitem__(self, n):
+        values = [x for x in self]
+        if isinstance(n, slice):
+            try:
+                return values[n]
+            except Exception as e:
+                raise e
+
+        for i in range(len(values)):
+            if i == n:
+                return values[i]
+
+    def __repr__(self):
+        return f'<{type(self).__name__} {list(self).__repr__()}>'
+
+    @property
+    def type(self) -> type:
+        return self._type
+
+    def _check_type(self, __object: any):
+        if self._type == any:
+            return
+
+        if self._type is not None and type(__object) != self._type and not isinstance(type(__object), self._type) and not issubclass(type(__object), self._type):
+            raise Exception(f'Unexpected type: {type(__object)}\nExpected type: {self._type}')
+
+    def _set_values(self, values: list):
+        self._values = SequenceValues(values, self._type)
+
+    def to_list(self) -> list:
+        r"""Converts :class: `cpl_query.base.sequence_abc.SequenceABC` to :class: `list`
+
+        Returns
+        -------
+            :class: `list`
+        """
+        return [x for x in self]
+
+    @classmethod
+    def empty(cls) -> 'SequenceABC':
+        r"""Returns an empty sequence
+
+        Returns
+        -------
+            Sequence object that contains no elements
+        """
+        return cls()
+
+    @classmethod
+    def range(cls, start: int, length: int) -> 'SequenceABC':
+        return cls(int, list(range(start, length)))