New: Release 0.2.0 - Added nullsafe function / method calls

Author: ianhco

README.md

@@ -58,7 +58,7 @@ Proxy class for granting nullsafe abilities to an object.
 
 No argument needed.
 
-Nullish class with with nullsafe abilities. Instances will have a falsy boolean evaluation, equity comparison (`==`) to `None` and instance of `NullSafe` returns `True`, otherwise `False`. Identity comparison (`is`) to `None` will return `False`.
+Nullish class with with nullsafe abilities. Instances will have a falsy boolean evaluation, equity comparison (`==`) to `None` and instance of `NullSafe` returns `True`, otherwise `False`. Identity comparison (`is`) to `None` will return `False`. It also has a `__call__` method that always returns `undefined`.
 
 ### variable `undefined: NullSafe`
 
@@ -114,6 +114,9 @@ assert _(o.existent).inexistent.nested is undefined
 
 # o.maybe?.inexistent?.nested
 assert _(_(o).maybe).inexistent.nested is undefined
+
+# o.inexistent?.inexistcall("anything").inexistent.nested().final
+assert _(o).inexistent.inexistcall("anything").inexistent.nested().final is undefined
 ```
 
 ### Null safe item access
@@ -136,6 +139,9 @@ assert _(o["existent"])["inexistent"]["nested"] is undefined
 
 # o.maybe?.inexistent?.nested
 assert _(_(o)["maybe"])["inexistent"]["nested"] is undefined
+
+# o.inexistent?.inexistcall("anything").inexistent.nested().final
+assert _(o)["inexistent"]["inexistcall"]("anything")["inexistent"]["nested"]()["final"] is undefined
 ```
 
 ### Null safe post evaluation
@@ -155,6 +161,9 @@ assert not _(o.nay).inexistent       # bool(undefined) == False
 
 # o.nay?.inexistent.nested
 assert _(o.nay).inexistent.nested is undefined
+
+# o.nay?.inexistent().nested
+assert _(o.nay).inexistent().nested is undefined
 ```
 
 ```python
@@ -163,11 +172,12 @@ o["nay"] = None
 
 # o.nay?.inexistent
 assert _(o["nay"])["inexistent"] is undefined
-assert not _(o["nay"])["inexistent"]
 
 # o.nay?.inexistent.nested
 assert _(o["nay"])["inexistent"]["nested"] is undefined
-assert not _(o["nay"])["inexistent"]["nested"]
+
+# o.nay?.inexistent().nested
+assert _(o["nay"])["inexistent"]()["nested"] is undefined
 ```
 
 ### Combined usage

nullsafe/core.py

@@ -20,6 +20,9 @@ def __eq__(self, o: object) -> bool:
             return True
         return False
 
+    def __call__(self, *args: Any, **kwds: Any) -> "NullSafe":
+        return undefined
+
     def __repr__(self) -> str:
         return "undefined"
 

setup.py

@@ -21,7 +21,7 @@
 
 setup(
     name="nullsafe",
-    version="0.1.2",
+    version="0.2.0",
     author="Paaksing",
     author_email="paaksingtech@gmail.com",
     url="https://github.com/paaksing/nullsafe-python",

test/test_cases.py

@@ -10,6 +10,15 @@ class TestClassOne:
     subscriptable: dict
 
 
+class TestClassCallable:
+
+    existent: int = 123
+    inexistent: str
+    
+    def caller(self, some: str, arg: int):
+        return f"{some}{arg}"
+
+
 class TestClassTwo:
 
     existent: str
@@ -205,3 +214,28 @@ def test_null_combined():
     assert _(o.subscriptable)["inexistent"].existent is undefined
     assert _(o.subscriptable)["inexistent"].existent is undefined
     assert o.subscriptable["existent"].existent == 123
+
+
+def test_null_call():
+    o = TestClassCallable()
+    try:
+        o.inexistent
+        assert False
+    except AttributeError as e:
+        assert "inexistent" in str(e)
+    assert _(o).inexistent() is undefined
+    assert _(o).inexistent() == NullSafe()
+    assert _(o).inexistent().inexistent is undefined
+    assert _(o).inexistent.inexistent() is undefined
+    assert _(o).inexistent.inexistent["dsrghsuiorgh"]() is undefined
+    assert _(o).inexistent("douihgrf", 35).inexistent["dsrghsuiorgh"]() is undefined
+    assert _(o).caller("some", 2) == "some2"
+
+    o = {"caller": TestClassCallable.caller}
+    assert _(o)["inexistent"]() is undefined
+    assert _(o)["inexistent"]() == NullSafe()
+    assert _(o)["inexistent"]().inexistent is undefined
+    assert _(o)["inexistent"]["inexistent"]() is undefined
+    assert _(o)["inexistent"]["inexistent"]["dsrghsuiorgh"]() is undefined
+    assert _(o)["inexistent"]("douihgrf", 35)["inexistent"]["dsrghsuiorgh"]() is undefined
+    assert _(o)["caller"]({"fakeself"}, "some", 2) == "some2"