From 81dfc32f67f8888c5d431b4e7af3ad83b93960aa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bart=C5=82omiej=20Przemys=C5=82aw=20Pluta?=
 <noreply.git@mx.bartlomiejpluta.com>
Date: Sat, 7 Mar 2020 19:12:47 +0100
Subject: [PATCH] Migrate access operator evaluator to Kotlin

---
 .../evaluator/AccessOperatorEvaluator.kt      | 33 +++++++++++++++++++
 .../evaluation/evaluator/DefaultEvaluator.kt  |  3 +-
 2 files changed, 35 insertions(+), 1 deletion(-)
 create mode 100644 src/main/kotlin/io/smnp/evaluation/evaluator/AccessOperatorEvaluator.kt

diff --git a/src/main/kotlin/io/smnp/evaluation/evaluator/AccessOperatorEvaluator.kt b/src/main/kotlin/io/smnp/evaluation/evaluator/AccessOperatorEvaluator.kt
new file mode 100644
index 0000000..7728991
--- /dev/null
+++ b/src/main/kotlin/io/smnp/evaluation/evaluator/AccessOperatorEvaluator.kt
@@ -0,0 +1,33 @@
+package io.smnp.evaluation.evaluator
+
+import io.smnp.dsl.ast.model.node.AccessOperatorNode
+import io.smnp.dsl.ast.model.node.FunctionCallNode
+import io.smnp.dsl.ast.model.node.IdentifierNode
+import io.smnp.dsl.ast.model.node.Node
+import io.smnp.error.EvaluationException
+import io.smnp.evaluation.environment.Environment
+import io.smnp.evaluation.model.entity.EvaluatorOutput
+
+class AccessOperatorEvaluator : Evaluator() {
+    override fun supportedNodes() = listOf(AccessOperatorNode::class)
+
+    override fun tryToEvaluate(node: Node, environment: Environment): EvaluatorOutput {
+        val evaluator = DefaultEvaluator()
+        val (lhsNode, _, rhsNode) = (node as AccessOperatorNode)
+        val lhs = evaluator.evaluate(lhsNode, environment).value!!
+
+        return when (rhsNode) {
+            is IdentifierNode -> {
+                val rhs = rhsNode.token.rawValue
+                EvaluatorOutput.value(lhs.properties[rhs] ?: throw EvaluationException("Unknown property $rhs of type ${lhs.type.name.toLowerCase()}", rhsNode.position))
+            }
+            is FunctionCallNode -> {
+                // todo Implement when methods become available
+                EvaluatorOutput.fail()
+            }
+            else -> {
+                throw EvaluationException("Invalid property access type - only property name and method call are allowed", rhsNode.position)
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/io/smnp/evaluation/evaluator/DefaultEvaluator.kt b/src/main/kotlin/io/smnp/evaluation/evaluator/DefaultEvaluator.kt
index cf45b78..2860e2b 100644
--- a/src/main/kotlin/io/smnp/evaluation/evaluator/DefaultEvaluator.kt
+++ b/src/main/kotlin/io/smnp/evaluation/evaluator/DefaultEvaluator.kt
@@ -21,7 +21,8 @@ class DefaultEvaluator : Evaluator() {
             NotOperatorEvaluator(),
             PowerOperatorEvaluator(),
             ProductOperatorEvaluator(),
-            SumOperatorEvaluator()
+            SumOperatorEvaluator(),
+            AccessOperatorEvaluator()
         ).evaluate(node, environment)
     }
 }
\ No newline at end of file