Add Relative Parameter Mode

IntComp/ComputerParameterMode.js

@@ -1,4 +1,4 @@
-const { DecimalPlaceIsNonZero } = require("./common");
+const { DecimalPlaceIsNonZero, GetDecimalInPlace } = require("./common");
 
 module.exports = {
     /**
@@ -15,6 +15,12 @@ module.exports = {
      * is interpreted as its literal value.
      */
     IMMEDIATE_MODE: 1,
+    /**
+     * Relative Mode
+     *
+     * Unknown.
+     */
+    RELATIVE_MODE: 2,
     /**
      * Parse an opcode to get the Parameter Mode for an operation's parameter
      *
@@ -31,7 +37,12 @@ module.exports = {
      * @returns {number} Either POSITION_MODE or IMMEDIATE_MODE
      */
     ParseParameterMode: function (rawOpcode, parameterIndex) {
-        if (DecimalPlaceIsNonZero(rawOpcode, parameterIndex + 1)) { return this.IMMEDIATE_MODE; }
-        return this.POSITION_MODE;
+        const paramModeFromOpcode = GetDecimalInPlace(rawOpcode, parameterIndex + 1);
+        switch (paramModeFromOpcode) {
+            case 0: return this.POSITION_MODE;
+            case 1: return this.IMMEDIATE_MODE;
+            case 2: return this.RELATIVE_MODE;
+            default: return this.POSITION_MODE;
+        }
     },
 };