Initial

resources/app/client-esm/dice/terms/operator.mjs

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+import RollTerm from "./term.mjs";
+
+/**
+ * A type of RollTerm used to denote and perform an arithmetic operation.
+ * @extends {RollTerm}
+ */
+export default class OperatorTerm extends RollTerm {
+  constructor({operator, options}={}) {
+    super({options});
+    this.operator = operator;
+  }
+
+  /**
+   * The term's operator value.
+   * @type {string}
+   */
+  operator;
+
+  /**
+   * An object of operators with their precedence values.
+   * @type {Readonly<Record<string, number>>}
+   */
+  static PRECEDENCE = Object.freeze({
+    "+": 10,
+    "-": 10,
+    "*": 20,
+    "/": 20,
+    "%": 20
+  });
+
+  /**
+   * An array of operators which represent arithmetic operations
+   * @type {string[]}
+   */
+  static OPERATORS = Object.keys(this.PRECEDENCE);
+
+  /** @inheritdoc */
+  static REGEXP = new RegExp(this.OPERATORS.map(o => "\\"+o).join("|"), "g");
+
+  /** @inheritdoc */
+  static SERIALIZE_ATTRIBUTES = ["operator"];
+
+  /** @inheritdoc */
+  get flavor() {
+    return ""; // Operator terms cannot have flavor text
+  }
+
+  /** @inheritdoc */
+  get expression() {
+    return ` ${this.operator} `;
+  }
+
+  /** @inheritdoc */
+  get total() {
+    return ` ${this.operator} `;
+  }
+}
+