Reformat evaluator #1

smnp/runtime/evaluators/assignment.py

@@ -0,0 +1,15 @@
+from smnp.error.runtime import RuntimeException
+from smnp.runtime.evaluator import evaluate
+from smnp.type.model import Type
+
+
+def evaluateAssignment(assignment, environment):
+    target = assignment.target.identifier
+    value = evaluate(assignment.value, environment)
+    if value.type == Type.VOID:
+        raise RuntimeException(f"Expected expression, found '{value.type.name}'", assignment.value.pos)
+    scopeOfExistingVariable = environment.findVariableScope(target)
+    if scopeOfExistingVariable is not None:
+        scopeOfExistingVariable[target] = value
+    else:
+        environment.scopes[-1][target] = value