Migrate assignment operator evaluator to Kotlin

app/src/main/kotlin/io/smnp/evaluation/evaluator/AssignmentOperatorEvaluator.kt

@@ -0,0 +1,23 @@
+package io.smnp.evaluation.evaluator
+
+import io.smnp.dsl.ast.model.node.AssignmentOperatorNode
+import io.smnp.dsl.ast.model.node.IdentifierNode
+import io.smnp.dsl.ast.model.node.Node
+import io.smnp.environment.Environment
+import io.smnp.evaluation.model.entity.EvaluatorOutput
+
+class AssignmentOperatorEvaluator : Evaluator() {
+    private val evaluator = ExpressionEvaluator()
+
+    override fun supportedNodes() = listOf(AssignmentOperatorNode::class)
+
+    override fun tryToEvaluate(node: Node, environment: Environment): EvaluatorOutput {
+        val (identifierNode, _, valueNode) = node as AssignmentOperatorNode
+        val identifier = (identifierNode as IdentifierNode).token.rawValue
+        val value = evaluator.evaluate(valueNode, environment).value!!
+
+        environment.setVariable(identifier, value)
+
+        return EvaluatorOutput.value(value)
+    }
+}

app/src/main/kotlin/io/smnp/evaluation/evaluator/ExpressionEvaluator.kt

@@ -27,6 +27,7 @@ class ExpressionEvaluator : Evaluator() {
             AccessOperatorEvaluator(),
             LogicOperatorEvaluator(),
             RelationOperatorEvaluator(),
+            AssignmentOperatorEvaluator(),
 
             FunctionCallEvaluator()
         ).evaluate(node, environment)