[orx-expression-evaluator] Switch to antlr-kotlin for parser generation and make it a common kotlin module

orx-expression-evaluator/src/jvmTest/kotlin/TestOperators.kt

@@ -0,0 +1,53 @@
+import org.amshove.kluent.shouldBeNear
+import org.openrndr.extra.expressions.evaluateExpression
+import kotlin.test.Test
+
+class TestOperators {
+    @Test
+    fun `an addition operation`() {
+        val result = evaluateExpression("1 + 2")
+        result?.shouldBeNear(3.0, 10E-6)
+    }
+
+    @Test
+    fun `a subtraction operation`() {
+        val result = evaluateExpression("1 - 2")
+        result?.shouldBeNear(-1.0, 10E-6)
+    }
+
+    @Test
+    fun `a modulus operation`() {
+        val result = evaluateExpression("4 % 2")
+        result?.shouldBeNear(0.0, 10E-6)
+    }
+
+    @Test
+    fun `a multiplication operation`() {
+        val result = evaluateExpression("4 * 2")
+        result?.shouldBeNear(8.0, 10E-6)
+    }
+
+    @Test
+    fun `a division operation`() {
+        val result = evaluateExpression("4 / 2")
+        result?.shouldBeNear(2.0, 10E-6)
+    }
+
+    @Test
+    fun `a multiplication and addition operation`() {
+        val result = evaluateExpression("4 * 2 + 1")
+        result?.shouldBeNear(9.0, 10E-6)
+    }
+
+    @Test
+    fun `an addition and multiplication`() {
+        val result = evaluateExpression("4 + 2 * 3")
+        result?.shouldBeNear(10.0, 10E-6)
+    }
+
+    @Test
+    fun `unary minus`() {
+        val result = evaluateExpression("-4.0")
+        result?.shouldBeNear(-4.0, 10E-6)
+    }
+}