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

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+import DiceTerm from "./dice.mjs";
+import Die from "./die.mjs";
+
+/**
+ * A type of DiceTerm used to represent a three-sided Fate/Fudge die.
+ * Mathematically behaves like 1d3-2
+ * @extends {DiceTerm}
+ */
+export default class FateDie extends DiceTerm {
+  constructor(termData) {
+    termData.faces = 3;
+    super(termData);
+  }
+
+  /** @inheritdoc */
+  static DENOMINATION = "f";
+
+  /** @inheritdoc */
+  static MODIFIERS = {
+    "r": Die.prototype.reroll,
+    "rr": Die.prototype.rerollRecursive,
+    "k": Die.prototype.keep,
+    "kh": Die.prototype.keep,
+    "kl": Die.prototype.keep,
+    "d": Die.prototype.drop,
+    "dh": Die.prototype.drop,
+    "dl": Die.prototype.drop
+  }
+
+  /* -------------------------------------------- */
+
+  /** @inheritdoc */
+  async roll({minimize=false, maximize=false, ...options}={}) {
+    const roll = {result: undefined, active: true};
+    if ( minimize ) roll.result = -1;
+    else if ( maximize ) roll.result = 1;
+    else roll.result = await this._roll(options);
+    if ( roll.result === undefined ) roll.result = this.randomFace();
+    if ( roll.result === -1 ) roll.failure = true;
+    if ( roll.result === 1 ) roll.success = true;
+    this.results.push(roll);
+    return roll;
+  }
+
+  /* -------------------------------------------- */
+
+  /** @override */
+  mapRandomFace(randomUniform) {
+    return Math.ceil((randomUniform * this.faces) - 2);
+  }
+
+  /* -------------------------------------------- */
+
+  /** @inheritdoc */
+  getResultLabel(result) {
+    return {
+      "-1": "-",
+      "0": " ",
+      "1": "+"
+    }[result.result];
+  }
+}