Add execution of MODIFY_RELATIVE_BASE_OFFSET opcode

IntComp/Computer.js

@@ -37,6 +37,7 @@ module.exports = class Computer {
             JUMP_IF_FALSE: 6,
             LESS_THAN: 7,
             EQUALS: 8,
+            MODIFY_RELATIVE_BASE: 9,
             HALT: 99,
         };
 
@@ -212,6 +213,10 @@ module.exports = class Computer {
                 this.running = false;
                 status = false;
                 break;
+            case this.OPCODES.MODIFY_RELATIVE_BASE: {
+                this.Operation_ModifyRelativeBase(rawOpcode);
+                break;
+            }
             default:
                 this.ThrowError(`Opcode ${opcode} not found`);
         }
@@ -425,6 +430,19 @@ module.exports = class Computer {
         this.stack.Put(outputPosition, Number(testPassed));
     }
 
+    /**
+     * Adjusts the current relative base offset of the computer
+     *
+     * @param {number} rawOpcode The opcode in memory used to make this call
+     * @returns {void}
+     */
+    Operation_ModifyRelativeBase(rawOpcode) {
+        const operandMode = ComputerParameterMode.ParseParameterMode(rawOpcode);
+        const adjustmentValue = this.stack.Next().Get(operandMode);
+
+        this.stack.AdjustRelativeBaseOffset(adjustmentValue);
+    }
+
     /**
      * Inspects various parts of the computer before every call to Execution
      *