Create evaluator for access operator

smnp/runtime/evaluators/unit.py

@@ -0,0 +1,34 @@
+from smnp.ast.node.identifier import Identifier, FunctionCall
+from smnp.error.runtime import RuntimeException
+from smnp.runtime.evaluator import Evaluator
+from smnp.runtime.evaluators.expression import expressionEvaluator
+from smnp.runtime.evaluators.iterable import abstractIterableEvaluator
+from smnp.runtime.tools.error import updatePos
+
+
+class UnitEvaluator(Evaluator):
+
+    @classmethod
+    def evaluator(cls, node, environment):
+        return
+
+
+class AccessEvaluator(Evaluator):
+
+    @classmethod
+    def evaluator(cls, node, environment):
+        left = expressionEvaluator(doAssert=True)(node.left, environment).value  # TODO check if it isn't necessary to verify 'result' attr of EvaluatioNResult
+        right = node.right
+
+        if type(right) == Identifier:
+            try:
+                return left.properties[right.value]
+            except KeyError:
+                raise RuntimeException(f"Unknown property '{right.value}' of type '{left.type.name.lower()}'", right.pos)
+
+        if type(right) == FunctionCall:
+            try:
+                arguments = abstractIterableEvaluator(expressionEvaluator(doAssert=True))(right.arguments, environment)
+                return environment.invokeMethod(left, right.name.value, arguments)
+            except RuntimeException as e:
+                raise updatePos(e, right)