[muscript] OEnum for representing enums

muscript/src/main/java/io/gitlab/jfronny/muscript/optic/OEnum.java

@@ -0,0 +1,52 @@
+package io.gitlab.jfronny.muscript.optic;
+
+import java.util.*;
+
+/** An enum represented as an OObject with automatic conversions to a number (index) and string (selected value) */
+public record OEnum(Map<String, OAny<?>> values, OEnumEntry value) implements OObject {
+    public OEnum(List<String> values, String value) {
+        this(createMap(values, value), new OEnumEntry(value, values.indexOf(value), true));
+    }
+
+    @Override
+    public Map<String, OAny<?>> getValue() {
+        return values;
+    }
+
+    @Override
+    public OString asString() {
+        return value;
+    }
+
+    @Override
+    public ONumber asNumber() {
+        return value.asNumber();
+    }
+
+    private static Map<String, OAny<?>> createMap(List<String> values, String value) {
+        Map<String, OAny<?>> result = new LinkedHashMap<>();
+        OEnumEntry v = new OEnumEntry(value, values.indexOf(value), true);
+        result.put("value", v);
+        for (int i = 0; i < values.size(); i++) {
+            result.put(values.get(i), new OEnumEntry(values.get(i), i, values.get(i).equals(value)));
+        }
+        return Map.copyOf(result);
+    }
+
+    public record OEnumEntry(String value, int index, boolean selected) implements OString {
+        @Override
+        public String getValue() {
+            return value;
+        }
+
+        @Override
+        public ONumber asNumber() {
+            return OFinal.of(index);
+        }
+
+        @Override
+        public OBool asBool() {
+            return OFinal.of(selected);
+        }
+    }
+}