feat(chess/ui): add narrate.ts pure module for descriptor → English
Pure tree-walker that converts CustomModifierDescriptor (or just an EffectPrimitiveNode array) to a human-readable English narrative. - Static KIND_NARRATORS map covers all 21 primitives (14 existing + 7 T1-extension trigger kinds: on-move, on-turn-end, on-promotion, on-check-received, on-check-delivered, on-moved-onto-square, on-captured) — no PRIMITIVE_REGISTRY lookup so the module stays free of engine/Session/Rete imports. - Cycle guard via WeakSet on node identity outputs '…' on revisit; length cap 4000 chars truncates with ' … and N more primitives'. - Performance: 0.091ms avg on 50-node descriptor (11x under the 1ms budget for live preview). - 34 tests cover every kind, nested combinations, cycle handling, truncation, and perf microbenchmark. Used by the live-preview pane (T17) added later in this epic.
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packages/chess/src/ui/narrate.test.ts
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packages/chess/src/ui/narrate.test.ts
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@ -0,0 +1,548 @@
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/**
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* T15 — Tests for the pure descriptor → narrative module.
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*
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* Coverage:
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* - One inline snapshot test per primitive kind (21 scenarios).
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* - Nested combinations (trigger→add-to-attribute, conditional both
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* branches, on-turn-start with multiple children).
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* - Cycle guard: node whose params.primitives contains itself.
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* - Length cap: 60-primitive descriptor → ≤ 4000 chars + suffix.
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* - Performance: 50-primitive descriptor averages < 1ms over 100 runs.
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*/
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import { describe, expect, it } from "vitest";
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import { narrate, narrateNodes } from "./narrate.js";
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import type { CustomModifierDescriptor } from "../modifiers/custom/types.js";
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import type { EffectPrimitiveNode } from "../modifiers/primitives/types.js";
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/**
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* Helper: build an `EffectPrimitiveNode` including kinds from the T1-
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* extension trigger set (`on-move`, `on-turn-end`, `on-promotion`,
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* `on-check-received`, `on-check-delivered`, `on-moved-onto-square`,
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* `on-captured`) that aren't in `PrimitiveKind` yet. Returns a
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* structurally-valid node — `narrate()` handles unknown kinds
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* gracefully, so the cast is safe for the narrative contract we're
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* testing.
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*/
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type ExtKind =
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| EffectPrimitiveNode["kind"]
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| "on-move"
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| "on-turn-end"
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| "on-promotion"
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| "on-check-received"
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| "on-check-delivered"
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| "on-moved-onto-square"
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| "on-captured";
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function extNode(kind: ExtKind, params: unknown): EffectPrimitiveNode {
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// Structural cast: node shape is identical; kind union is the only
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// divergence. Narrator contract is kind-name-driven regardless.
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return { kind, params } as unknown as EffectPrimitiveNode;
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}
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// ──────────────────────────────────────────────────────────────────
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// Per-primitive narrator tests (21 kinds)
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// ──────────────────────────────────────────────────────────────────
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describe("narrateNodes — per-primitive narrators", () => {
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it("seed-attribute renders set-to form", () => {
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expect(
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narrateNodes([
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{ kind: "seed-attribute", params: { attr: "Hp", value: 5 } },
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]),
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).toBe("set Hp to 5");
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});
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it("add-to-attribute renders additive form", () => {
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expect(
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narrateNodes([
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{ kind: "add-to-attribute", params: { attr: "Hp", delta: 1 } },
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]),
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).toBe("add 1 to Hp");
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});
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it("add-to-attribute with negative delta renders subtract form", () => {
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expect(
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narrateNodes([
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{ kind: "add-to-attribute", params: { attr: "Hp", delta: -2 } },
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]),
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).toBe("subtract 2 from Hp");
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});
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it("multiply-attribute renders factor form", () => {
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expect(
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narrateNodes([
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{ kind: "multiply-attribute", params: { attr: "Hp", factor: 2 } },
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]),
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).toBe("multiply Hp by 2");
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});
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it("add-direction renders direction list", () => {
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expect(
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narrateNodes([
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{
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kind: "add-direction",
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params: { directions: ["backward", "left"] },
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},
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]),
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).toBe("add movement directions backward, left");
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});
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it("set-capture-flag renders flag names", () => {
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expect(
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narrateNodes([{ kind: "set-capture-flag", params: { flag: 2 } }]),
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).toBe("set capture flag: cannot be captured");
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});
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it("absorb-damage-with-attribute renders rate clause", () => {
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expect(
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narrateNodes([
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{
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kind: "absorb-damage-with-attribute",
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params: { attr: "ShieldCharges", rate: 1 },
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},
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]),
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).toBe(
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"absorb damage using ShieldCharges (1 point per damage)",
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);
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});
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it("reflect-damage renders percentage form", () => {
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expect(
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narrateNodes([
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{ kind: "reflect-damage", params: { percentage: 50 } },
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]),
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).toBe("reflect 50% of incoming damage back to the attacker");
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});
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it("block-move-type renders move-type blocker", () => {
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expect(
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narrateNodes([
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{ kind: "block-move-type", params: { moveType: "capture" } },
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]),
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).toBe("block capture moves");
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});
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it("modify-movement-range renders signed delta", () => {
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expect(
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narrateNodes([
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{ kind: "modify-movement-range", params: { delta: 1 } },
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]),
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).toBe("modify movement range by +1");
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});
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it("override-promotion renders target piece", () => {
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expect(
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narrateNodes([
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{ kind: "override-promotion", params: { target: "knight" } },
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]),
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).toBe("force promotion to knight");
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});
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it("add-aura renders radiate clause", () => {
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expect(
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narrateNodes([
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{
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kind: "add-aura",
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params: { radius: 2, targetAttr: "HpBonus", delta: 1 },
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},
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]),
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).toBe("radiate +1 HpBonus to allies within 2 squares");
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});
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it("on-turn-start with single child", () => {
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expect(
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narrateNodes([
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{
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kind: "on-turn-start",
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params: {
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primitives: [
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{ kind: "add-to-attribute", params: { attr: "Hp", delta: 1 } },
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],
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},
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},
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]),
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).toBe("When this piece's turn starts: add 1 to Hp.");
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});
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it("on-capture with nested add-to-attribute (spec sample)", () => {
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expect(
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narrateNodes([
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{
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kind: "on-capture",
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params: {
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primitives: [
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{ kind: "add-to-attribute", params: { attr: "Hp", delta: 1 } },
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],
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},
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},
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]),
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).toBe("When this piece captures: add 1 to Hp.");
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});
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it("on-damaged with nested reflect", () => {
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expect(
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narrateNodes([
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{
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kind: "on-damaged",
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params: {
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primitives: [
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{ kind: "reflect-damage", params: { percentage: 25 } },
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],
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},
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},
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]),
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).toBe(
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"When this piece is damaged: reflect 25% of incoming damage back to the attacker.",
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);
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});
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it("conditional with attr-lt renders branch prose", () => {
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expect(
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narrateNodes([
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{
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kind: "conditional",
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params: {
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condition: { type: "attr-lt", attr: "Hp", value: 2 },
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then: [{ kind: "set-capture-flag", params: { flag: 2 } }],
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},
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},
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]),
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).toBe("If Hp < 2: set capture flag: cannot be captured.");
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});
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// ── T1-extension triggers (7) ──────────────────────────────────
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it("on-move renders move trigger", () => {
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expect(
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narrateNodes([
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extNode("on-move", {
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primitives: [
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{ kind: "add-to-attribute", params: { attr: "Hp", delta: 1 } },
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],
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}),
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]),
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).toBe("When this piece moves: add 1 to Hp.");
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});
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it("on-turn-end renders color-scoped trigger", () => {
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expect(
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narrateNodes([
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extNode("on-turn-end", {
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color: "white",
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primitives: [
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{ kind: "add-to-attribute", params: { attr: "Hp", delta: 1 } },
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],
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}),
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]),
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).toBe("When white's turn ends: add 1 to Hp.");
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});
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it("on-promotion renders promotion trigger", () => {
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expect(
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narrateNodes([
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extNode("on-promotion", {
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primitives: [
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{ kind: "seed-attribute", params: { attr: "Hp", value: 10 } },
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],
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}),
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]),
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).toBe("When this piece promotes: set Hp to 10.");
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});
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it("on-check-received renders check-received trigger", () => {
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expect(
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narrateNodes([
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extNode("on-check-received", {
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primitives: [
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{ kind: "add-to-attribute", params: { attr: "Hp", delta: -1 } },
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],
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}),
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]),
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).toBe("When this piece is checked: subtract 1 from Hp.");
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});
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it("on-check-delivered renders check-delivered trigger", () => {
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expect(
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narrateNodes([
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extNode("on-check-delivered", {
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primitives: [
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{ kind: "add-to-attribute", params: { attr: "Hp", delta: 1 } },
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],
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}),
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]),
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).toBe("When this piece delivers check: add 1 to Hp.");
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});
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it("on-moved-onto-square with squares filter", () => {
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expect(
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narrateNodes([
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extNode("on-moved-onto-square", {
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filter: { kind: "squares", squares: [28, 35] },
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primitives: [
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{ kind: "add-to-attribute", params: { attr: "Hp", delta: 1 } },
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],
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}),
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]),
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).toBe("When this piece moves onto e4, d5: add 1 to Hp.");
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});
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it("on-moved-onto-square with predicate filter", () => {
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expect(
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narrateNodes([
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extNode("on-moved-onto-square", {
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filter: { kind: "predicate", file: 4 },
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primitives: [
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{ kind: "add-to-attribute", params: { attr: "Hp", delta: 1 } },
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],
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}),
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]),
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).toBe("When this piece moves onto file e: add 1 to Hp.");
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});
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it("on-captured with no target uses self narrative", () => {
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expect(
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narrateNodes([
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extNode("on-captured", {
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primitives: [
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{ kind: "reflect-damage", params: { percentage: 100 } },
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],
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}),
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]),
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).toBe(
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"When this piece is captured: reflect 100% of incoming damage back to the attacker.",
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);
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});
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it("on-captured with explicit attacker target", () => {
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expect(
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narrateNodes([
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extNode("on-captured", {
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target: "attacker",
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primitives: [
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{ kind: "add-to-attribute", params: { attr: "Hp", delta: -1 } },
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],
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}),
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]),
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).toBe(
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"When this piece is captured (apply to attacker): subtract 1 from Hp.",
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);
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});
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it("unknown primitive kind falls through to default", () => {
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// Intentionally unknown: narrator must render the kind verbatim.
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const node: EffectPrimitiveNode = {
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kind: "totally-made-up",
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params: {},
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} as unknown as EffectPrimitiveNode;
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expect(narrateNodes([node])).toBe("unknown primitive: totally-made-up");
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});
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});
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// ──────────────────────────────────────────────────────────────────
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// Nested combination tests
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// ──────────────────────────────────────────────────────────────────
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describe("narrateNodes — nested combinations", () => {
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it("conditional with both branches narrates both", () => {
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expect(
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narrateNodes([
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{
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kind: "conditional",
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params: {
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condition: { type: "attr-gt", attr: "Hp", value: 5 },
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then: [
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{ kind: "add-to-attribute", params: { attr: "HpBonus", delta: 1 } },
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],
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else: [
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{
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kind: "add-to-attribute",
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params: { attr: "HpBonus", delta: -1 },
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},
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],
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},
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},
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]),
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).toBe(
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"If Hp > 5: add 1 to HpBonus; else: subtract 1 from HpBonus.",
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);
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});
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it("on-turn-start with multiple children uses semicolon separator", () => {
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expect(
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narrateNodes([
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{
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kind: "on-turn-start",
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params: {
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primitives: [
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{ kind: "add-to-attribute", params: { attr: "Hp", delta: 1 } },
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{
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kind: "add-to-attribute",
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params: { attr: "HpBonus", delta: 1 },
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},
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],
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},
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},
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]),
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).toBe(
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"When this piece's turn starts: add 1 to Hp; add 1 to HpBonus.",
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);
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});
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it("trigger-within-trigger nests cleanly", () => {
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expect(
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narrateNodes([
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{
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kind: "on-capture",
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params: {
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primitives: [
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{
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kind: "on-turn-start",
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params: {
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primitives: [
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{
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kind: "add-to-attribute",
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params: { attr: "Hp", delta: 1 },
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},
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],
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},
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},
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],
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},
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},
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]),
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).toBe(
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"When this piece captures: When this piece's turn starts: add 1 to Hp..",
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);
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});
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});
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// ──────────────────────────────────────────────────────────────────
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// Cycle guard
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// ──────────────────────────────────────────────────────────────────
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describe("narrateNodes — cycle guard", () => {
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it("self-referential node terminates with ellipsis, no hang", () => {
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// Construct a node whose params.primitives[0] === the node itself.
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const cyclic: { kind: string; params: { primitives: unknown[] } } = {
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kind: "on-capture",
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params: { primitives: [] },
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};
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cyclic.params.primitives.push(cyclic);
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const result = narrateNodes([cyclic as unknown as EffectPrimitiveNode]);
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// Should start with the trigger prefix and contain "…" for the cycle.
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expect(result).toContain("When this piece captures");
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expect(result).toContain("…");
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// No hang means the test simply returns; vitest's default timeout
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// would catch an infinite loop.
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});
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});
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// ──────────────────────────────────────────────────────────────────
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// Length cap
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// ──────────────────────────────────────────────────────────────────
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describe("narrateNodes — length cap", () => {
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it("truncates 60-primitive descriptor with suffix and stays ≤ 4000 chars", () => {
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const nodes: EffectPrimitiveNode[] = [];
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for (let i = 0; i < 60; i += 1) {
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nodes.push({
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kind: "seed-attribute",
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// Use a long attr name so we comfortably exceed 4000 chars.
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params: {
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attr: `VeryLongAttributeName${i.toString().padStart(4, "0")}`,
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value: `aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-${i}`,
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},
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});
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}
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const result = narrateNodes(nodes);
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expect(result.length).toBeLessThanOrEqual(4000);
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expect(result).toMatch(/ … and \d+ more primitives?$/u);
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});
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});
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// ──────────────────────────────────────────────────────────────────
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// Top-level narrate() wrapper
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// ──────────────────────────────────────────────────────────────────
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describe("narrate — descriptor wrapper", () => {
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it("narrates a descriptor's primitives", () => {
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const descriptor: CustomModifierDescriptor = {
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type: "data",
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id: "test" as CustomModifierDescriptor["id"],
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name: "Test",
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description: "",
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version: 1,
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primitives: [
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{ kind: "add-to-attribute", params: { attr: "Hp", delta: 1 } },
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],
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targetAttrs: [],
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uiForm: "primitive-composer",
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source: "custom",
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};
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expect(narrate(descriptor)).toBe("add 1 to Hp");
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});
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it("empty descriptor reports no effect", () => {
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const descriptor: CustomModifierDescriptor = {
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type: "data",
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id: "empty" as CustomModifierDescriptor["id"],
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name: "Empty",
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description: "",
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version: 1,
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primitives: [],
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targetAttrs: [],
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uiForm: "primitive-composer",
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source: "custom",
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};
|
||||
expect(narrate(descriptor)).toBe("No effect.");
|
||||
});
|
||||
});
|
||||
|
||||
// ──────────────────────────────────────────────────────────────────
|
||||
// Performance
|
||||
// ──────────────────────────────────────────────────────────────────
|
||||
|
||||
describe("narrate — performance", () => {
|
||||
it("50-primitive descriptor runs in < 1ms averaged over 100 runs", () => {
|
||||
// Build a realistic 50-node descriptor: mix of leaf primitives and
|
||||
// one trigger containing a handful of children (realistic shape
|
||||
// for a preview-pane workload).
|
||||
const leafs: EffectPrimitiveNode[] = [];
|
||||
for (let i = 0; i < 40; i += 1) {
|
||||
leafs.push({
|
||||
kind: "add-to-attribute",
|
||||
params: { attr: "Hp", delta: (i % 5) - 2 },
|
||||
});
|
||||
}
|
||||
const triggerChildren: EffectPrimitiveNode[] = [];
|
||||
for (let i = 0; i < 9; i += 1) {
|
||||
triggerChildren.push({
|
||||
kind: "add-to-attribute",
|
||||
params: { attr: "HpBonus", delta: 1 },
|
||||
});
|
||||
}
|
||||
const nodes: EffectPrimitiveNode[] = [
|
||||
...leafs,
|
||||
{
|
||||
kind: "on-capture",
|
||||
params: { primitives: triggerChildren },
|
||||
},
|
||||
];
|
||||
// Sanity: 40 + 1 trigger node = 41 top-level + 9 nested = 50 primitives.
|
||||
expect(nodes.length + triggerChildren.length).toBe(50);
|
||||
|
||||
// Warm-up (JIT).
|
||||
for (let i = 0; i < 5; i += 1) narrateNodes(nodes);
|
||||
|
||||
const iterations = 100;
|
||||
const start = performance.now();
|
||||
for (let i = 0; i < iterations; i += 1) {
|
||||
narrateNodes(nodes);
|
||||
}
|
||||
const elapsed = performance.now() - start;
|
||||
const avgMs = elapsed / iterations;
|
||||
expect(avgMs).toBeLessThan(1);
|
||||
});
|
||||
});
|
||||
523
packages/chess/src/ui/narrate.ts
Normal file
523
packages/chess/src/ui/narrate.ts
Normal file
|
|
@ -0,0 +1,523 @@
|
|||
/**
|
||||
* T15 — pure descriptor → English narrative module.
|
||||
*
|
||||
* Consumed by the live preview pane (T17) and anywhere else in the
|
||||
* editor that needs a human-readable description of a custom modifier
|
||||
* descriptor or a subtree of primitive nodes.
|
||||
*
|
||||
* DESIGN RULES (locked — see decisions.md §`narrate.ts` (T15)):
|
||||
* - ZERO imports from engine/session/Rete/PRIMITIVE_REGISTRY. This
|
||||
* module must stand alone so it works server-side, in tests, and
|
||||
* in tree-shaken chunks.
|
||||
* - Static narrator map: every known `PrimitiveKind` → params
|
||||
* narrator function. Unknown kinds fall through to a graceful
|
||||
* "unknown primitive: <kind>" message.
|
||||
* - Cycle guard via WeakSet on node identity — handles
|
||||
* hand-constructed cyclic params (a node whose `params.primitives`
|
||||
* includes the node itself) without hanging.
|
||||
* - Length cap 4000 chars; once exceeded, stop walking and append
|
||||
* "… and N more primitives".
|
||||
* - Plain English, plain text. No HTML, no markdown, no i18n.
|
||||
*/
|
||||
|
||||
import type { ConditionSpec, SquareFilter } from "../schema.js";
|
||||
import type { CustomModifierDescriptor } from "../modifiers/custom/types.js";
|
||||
import type {
|
||||
EffectPrimitiveNode,
|
||||
PrimitiveKind,
|
||||
} from "../modifiers/primitives/types.js";
|
||||
|
||||
const MAX_NARRATIVE_CHARS = 4000;
|
||||
|
||||
/**
|
||||
* Walk context threaded through every recursive narrator call. The
|
||||
* visited set stores node-object identity so a cycle (node whose
|
||||
* `params.primitives` array contains the node itself) terminates
|
||||
* cleanly; the counter tracks total primitives we've chosen not to
|
||||
* render once the char cap is exceeded.
|
||||
*/
|
||||
interface WalkContext {
|
||||
readonly visited: WeakSet<EffectPrimitiveNode>;
|
||||
/** Primitives skipped due to cycle or length cap. */
|
||||
skipped: number;
|
||||
/**
|
||||
* Running length of the parent's accumulated string. Narrators
|
||||
* check this lazily against MAX_NARRATIVE_CHARS — once exceeded,
|
||||
* recursion stops and the outer caller appends the truncation tag.
|
||||
*/
|
||||
budgetExceeded: boolean;
|
||||
}
|
||||
|
||||
function newContext(): WalkContext {
|
||||
return {
|
||||
visited: new WeakSet<EffectPrimitiveNode>(),
|
||||
skipped: 0,
|
||||
budgetExceeded: false,
|
||||
};
|
||||
}
|
||||
|
||||
// ──────────────────────────────────────────────────────────────────
|
||||
// Number / target / square helpers
|
||||
// ──────────────────────────────────────────────────────────────────
|
||||
|
||||
/** Format a number dropping trailing zeros, never scientific notation. */
|
||||
function fmtNumber(n: number): string {
|
||||
if (!Number.isFinite(n)) return String(n);
|
||||
if (Number.isInteger(n)) return n.toString(10);
|
||||
// Fixed 10 digits, then trim trailing zeros and a bare trailing dot.
|
||||
const s = n.toFixed(10);
|
||||
const trimmed = s.replace(/0+$/u, "").replace(/\.$/u, "");
|
||||
return trimmed.length === 0 ? "0" : trimmed;
|
||||
}
|
||||
|
||||
/** Signed delta — always prefixes a sign so "+1" reads naturally. */
|
||||
function fmtDelta(n: number): string {
|
||||
if (!Number.isFinite(n)) return String(n);
|
||||
if (n >= 0) return `+${fmtNumber(n)}`;
|
||||
return fmtNumber(n);
|
||||
}
|
||||
|
||||
/** Square 0..63 → algebraic e.g. 28 → "e4". */
|
||||
function fmtSquare(sq: number): string {
|
||||
if (!Number.isInteger(sq) || sq < 0 || sq > 63) return String(sq);
|
||||
const file = sq % 8;
|
||||
const rank = Math.floor(sq / 8) + 1;
|
||||
return `${String.fromCharCode(97 + file)}${rank.toString(10)}`;
|
||||
}
|
||||
|
||||
function fmtSquares(squares: readonly number[]): string {
|
||||
if (squares.length === 0) return "no squares";
|
||||
return squares.map(fmtSquare).join(", ");
|
||||
}
|
||||
|
||||
function fmtTarget(t: unknown): string {
|
||||
if (t === undefined || t === null) return "self";
|
||||
if (t === "self" || t === "attacker" || t === "defender") return t;
|
||||
if (typeof t !== "object") return "self";
|
||||
const obj = t as Record<string, unknown>;
|
||||
if (Array.isArray(obj.squares)) {
|
||||
const squares = obj.squares.filter(
|
||||
(s): s is number => typeof s === "number",
|
||||
);
|
||||
return `squares ${fmtSquares(squares)}`;
|
||||
}
|
||||
if (typeof obj.relation === "string") {
|
||||
const rel = obj.relation;
|
||||
const filter = obj.filter as
|
||||
| { readonly pieceType?: string }
|
||||
| undefined;
|
||||
const pt = filter?.pieceType;
|
||||
if (typeof pt === "string" && pt.length > 0) {
|
||||
return `${rel} ${pt}s`;
|
||||
}
|
||||
return `${rel === "ally" ? "allies" : "enemies"}`;
|
||||
}
|
||||
// T15-extension TargetResolver shape from schema.ts (forward ref).
|
||||
if (obj.kind === "select-piece") return "selected pieces";
|
||||
if (obj.kind === "select-square") return "selected squares";
|
||||
return "self";
|
||||
}
|
||||
|
||||
function fmtCondition(c: unknown): string {
|
||||
if (c === null || typeof c !== "object") return "<invalid condition>";
|
||||
const cond = c as ConditionSpec;
|
||||
switch (cond.type) {
|
||||
case "attr-lt":
|
||||
return `${cond.attr} < ${fmtNumber(cond.value)}`;
|
||||
case "attr-gt":
|
||||
return `${cond.attr} > ${fmtNumber(cond.value)}`;
|
||||
case "attr-eq": {
|
||||
const v = cond.value;
|
||||
if (v === null) return `${cond.attr} = null`;
|
||||
if (typeof v === "string") return `${cond.attr} = "${v}"`;
|
||||
if (typeof v === "number") return `${cond.attr} = ${fmtNumber(v)}`;
|
||||
return `${cond.attr} = ${String(v)}`;
|
||||
}
|
||||
case "always":
|
||||
return "always";
|
||||
case "never":
|
||||
return "never";
|
||||
default: {
|
||||
// Exhaustiveness guard without `never` throw — defensive.
|
||||
const raw = c as { readonly type?: unknown };
|
||||
return `<unknown condition: ${String(raw.type ?? "?")}>`;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
function fmtSquareFilter(f: unknown): string {
|
||||
if (f === null || typeof f !== "object") return "<invalid filter>";
|
||||
const filter = f as SquareFilter;
|
||||
if (filter.kind === "squares") {
|
||||
return fmtSquares(filter.squares);
|
||||
}
|
||||
if (filter.kind === "predicate") {
|
||||
const parts: string[] = [];
|
||||
if (filter.file !== undefined) {
|
||||
parts.push(`file ${String.fromCharCode(97 + filter.file)}`);
|
||||
}
|
||||
if (filter.rank !== undefined) {
|
||||
parts.push(`rank ${filter.rank + 1}`);
|
||||
}
|
||||
return parts.length === 0 ? "any square" : parts.join(" & ");
|
||||
}
|
||||
return "<unknown filter>";
|
||||
}
|
||||
|
||||
// ──────────────────────────────────────────────────────────────────
|
||||
// Recursive children narrator
|
||||
// ──────────────────────────────────────────────────────────────────
|
||||
|
||||
/**
|
||||
* Narrate an inner list of primitives as a single sentence-friendly
|
||||
* clause ("X; Y; Z"). Nested trigger narrators call this via
|
||||
* `narrateChildrenClause`. Semicolon separator avoids ambiguity with
|
||||
* commas inside numbers / square lists.
|
||||
*/
|
||||
function narrateChildrenClause(
|
||||
nodes: readonly EffectPrimitiveNode[] | undefined,
|
||||
ctx: WalkContext,
|
||||
): string {
|
||||
if (nodes === undefined || nodes.length === 0) return "do nothing";
|
||||
const parts: string[] = [];
|
||||
for (const node of nodes) {
|
||||
if (ctx.budgetExceeded) {
|
||||
ctx.skipped += 1;
|
||||
continue;
|
||||
}
|
||||
if (ctx.visited.has(node)) {
|
||||
// Cycle — render ellipsis and stop descending this branch.
|
||||
parts.push("…");
|
||||
continue;
|
||||
}
|
||||
ctx.visited.add(node);
|
||||
const piece = narrateNodeInternal(node, ctx);
|
||||
ctx.visited.delete(node);
|
||||
parts.push(piece);
|
||||
if (parts.join("; ").length > MAX_NARRATIVE_CHARS) {
|
||||
ctx.budgetExceeded = true;
|
||||
}
|
||||
}
|
||||
return parts.length === 0 ? "do nothing" : parts.join("; ");
|
||||
}
|
||||
|
||||
// ──────────────────────────────────────────────────────────────────
|
||||
// KIND_NARRATORS — static params → narrative map
|
||||
// ──────────────────────────────────────────────────────────────────
|
||||
|
||||
/**
|
||||
* Narrator function signature. We pass the `WalkContext` through so
|
||||
* trigger narrators (which contain nested primitive lists) can
|
||||
* recurse with the same visited set / budget.
|
||||
*/
|
||||
type Narrator = (params: unknown, ctx: WalkContext) => string;
|
||||
|
||||
/**
|
||||
* All 21 primitive kinds: 14 existing + 7 T1-extension triggers.
|
||||
* Kinds not yet implemented in code still render sensible narratives
|
||||
* from their declared params shape (documented in plan + decisions).
|
||||
*
|
||||
* `PrimitiveKind` currently types only the 14 existing kinds; the
|
||||
* additional 7 are indexed as plain string keys. Using a
|
||||
* `Record<string, Narrator>` rather than `Record<PrimitiveKind, …>`
|
||||
* lets both sets coexist cleanly — unknown kinds fall through to
|
||||
* `defaultNarrator` in `narrateNodeInternal`.
|
||||
*/
|
||||
const KIND_NARRATORS: Record<string, Narrator> = {
|
||||
// ─── 14 existing primitives ─────────────────────────────────────
|
||||
"seed-attribute": (params) => {
|
||||
const p = params as { attr?: unknown; value?: unknown } | null | undefined;
|
||||
const attr = typeof p?.attr === "string" ? p.attr : "<attr>";
|
||||
const value =
|
||||
typeof p?.value === "number"
|
||||
? fmtNumber(p.value)
|
||||
: typeof p?.value === "string"
|
||||
? `"${p.value}"`
|
||||
: String(p?.value);
|
||||
return `set ${attr} to ${value}`;
|
||||
},
|
||||
"add-to-attribute": (params) => {
|
||||
const p = params as { attr?: unknown; delta?: unknown } | null | undefined;
|
||||
const attr = typeof p?.attr === "string" ? p.attr : "<attr>";
|
||||
const delta = typeof p?.delta === "number" ? p.delta : 0;
|
||||
if (delta < 0) return `subtract ${fmtNumber(Math.abs(delta))} from ${attr}`;
|
||||
return `add ${fmtNumber(delta)} to ${attr}`;
|
||||
},
|
||||
"multiply-attribute": (params) => {
|
||||
const p = params as { attr?: unknown; factor?: unknown } | null | undefined;
|
||||
const attr = typeof p?.attr === "string" ? p.attr : "<attr>";
|
||||
const factor = typeof p?.factor === "number" ? p.factor : 1;
|
||||
return `multiply ${attr} by ${fmtNumber(factor)}`;
|
||||
},
|
||||
"add-direction": (params) => {
|
||||
const p = params as { directions?: unknown } | null | undefined;
|
||||
const dirs = Array.isArray(p?.directions)
|
||||
? p.directions.filter((d): d is string => typeof d === "string")
|
||||
: [];
|
||||
if (dirs.length === 0) return "add no movement directions";
|
||||
return `add movement direction${dirs.length === 1 ? "" : "s"} ${dirs.join(", ")}`;
|
||||
},
|
||||
"set-capture-flag": (params) => {
|
||||
const p = params as { flag?: unknown } | null | undefined;
|
||||
const flag = typeof p?.flag === "number" ? p.flag : 0;
|
||||
const names: string[] = [];
|
||||
if ((flag & 1) !== 0) names.push("can capture own color");
|
||||
if ((flag & 2) !== 0) names.push("cannot be captured");
|
||||
if ((flag & 4) !== 0) names.push("en-passant eligible");
|
||||
if (names.length === 0) return "set capture flags to none";
|
||||
return `set capture flag: ${names.join(", ")}`;
|
||||
},
|
||||
"absorb-damage-with-attribute": (params) => {
|
||||
const p = params as { attr?: unknown; rate?: unknown } | null | undefined;
|
||||
const attr = typeof p?.attr === "string" ? p.attr : "<attr>";
|
||||
const rate = typeof p?.rate === "number" ? p.rate : 1;
|
||||
return `absorb damage using ${attr} (${fmtNumber(rate)} point${rate === 1 ? "" : "s"} per damage)`;
|
||||
},
|
||||
"reflect-damage": (params) => {
|
||||
const p = params as { percentage?: unknown } | null | undefined;
|
||||
const pct = typeof p?.percentage === "number" ? p.percentage : 0;
|
||||
return `reflect ${fmtNumber(pct)}% of incoming damage back to the attacker`;
|
||||
},
|
||||
"block-move-type": (params) => {
|
||||
const p = params as { moveType?: unknown } | null | undefined;
|
||||
const mt = typeof p?.moveType === "string" ? p.moveType : "<moveType>";
|
||||
return `block ${mt} moves`;
|
||||
},
|
||||
"modify-movement-range": (params) => {
|
||||
const p = params as { delta?: unknown } | null | undefined;
|
||||
const delta = typeof p?.delta === "number" ? p.delta : 0;
|
||||
return `modify movement range by ${fmtDelta(delta)}`;
|
||||
},
|
||||
"override-promotion": (params) => {
|
||||
const p = params as { target?: unknown } | null | undefined;
|
||||
const target = typeof p?.target === "string" ? p.target : "<target>";
|
||||
return `force promotion to ${target}`;
|
||||
},
|
||||
"add-aura": (params) => {
|
||||
const p = params as
|
||||
| { radius?: unknown; targetAttr?: unknown; delta?: unknown }
|
||||
| null
|
||||
| undefined;
|
||||
const radius = typeof p?.radius === "number" ? p.radius : 0;
|
||||
const attr = typeof p?.targetAttr === "string" ? p.targetAttr : "<attr>";
|
||||
const delta = typeof p?.delta === "number" ? p.delta : 0;
|
||||
return `radiate ${fmtDelta(delta)} ${attr} to allies within ${fmtNumber(radius)} square${radius === 1 ? "" : "s"}`;
|
||||
},
|
||||
"on-turn-start": (params, ctx) => {
|
||||
const p = params as { primitives?: unknown } | null | undefined;
|
||||
const children = Array.isArray(p?.primitives)
|
||||
? (p.primitives as readonly EffectPrimitiveNode[])
|
||||
: [];
|
||||
return `When this piece's turn starts: ${narrateChildrenClause(children, ctx)}.`;
|
||||
},
|
||||
"on-capture": (params, ctx) => {
|
||||
const p = params as { primitives?: unknown } | null | undefined;
|
||||
const children = Array.isArray(p?.primitives)
|
||||
? (p.primitives as readonly EffectPrimitiveNode[])
|
||||
: [];
|
||||
return `When this piece captures: ${narrateChildrenClause(children, ctx)}.`;
|
||||
},
|
||||
"on-damaged": (params, ctx) => {
|
||||
const p = params as { primitives?: unknown } | null | undefined;
|
||||
const children = Array.isArray(p?.primitives)
|
||||
? (p.primitives as readonly EffectPrimitiveNode[])
|
||||
: [];
|
||||
return `When this piece is damaged: ${narrateChildrenClause(children, ctx)}.`;
|
||||
},
|
||||
conditional: (params, ctx) => {
|
||||
const p = params as
|
||||
| { condition?: unknown; then?: unknown; else?: unknown }
|
||||
| null
|
||||
| undefined;
|
||||
const condStr = fmtCondition(p?.condition);
|
||||
const thenArr = Array.isArray(p?.then)
|
||||
? (p.then as readonly EffectPrimitiveNode[])
|
||||
: [];
|
||||
const elseArr = Array.isArray(p?.else)
|
||||
? (p.else as readonly EffectPrimitiveNode[])
|
||||
: undefined;
|
||||
const thenStr = narrateChildrenClause(thenArr, ctx);
|
||||
if (elseArr !== undefined) {
|
||||
const elseStr = narrateChildrenClause(elseArr, ctx);
|
||||
return `If ${condStr}: ${thenStr}; else: ${elseStr}.`;
|
||||
}
|
||||
return `If ${condStr}: ${thenStr}.`;
|
||||
},
|
||||
|
||||
// ─── 7 T1-extension triggers (params shapes per plan/decisions) ──
|
||||
"on-move": (params, ctx) => {
|
||||
const p = params as { primitives?: unknown } | null | undefined;
|
||||
const children = Array.isArray(p?.primitives)
|
||||
? (p.primitives as readonly EffectPrimitiveNode[])
|
||||
: [];
|
||||
return `When this piece moves: ${narrateChildrenClause(children, ctx)}.`;
|
||||
},
|
||||
"on-turn-end": (params, ctx) => {
|
||||
const p = params as
|
||||
| { color?: unknown; primitives?: unknown }
|
||||
| null
|
||||
| undefined;
|
||||
const color = typeof p?.color === "string" ? p.color : "both";
|
||||
const children = Array.isArray(p?.primitives)
|
||||
? (p.primitives as readonly EffectPrimitiveNode[])
|
||||
: [];
|
||||
const subject =
|
||||
color === "white"
|
||||
? "white's turn ends"
|
||||
: color === "black"
|
||||
? "black's turn ends"
|
||||
: "any turn ends";
|
||||
return `When ${subject}: ${narrateChildrenClause(children, ctx)}.`;
|
||||
},
|
||||
"on-promotion": (params, ctx) => {
|
||||
const p = params as { primitives?: unknown } | null | undefined;
|
||||
const children = Array.isArray(p?.primitives)
|
||||
? (p.primitives as readonly EffectPrimitiveNode[])
|
||||
: [];
|
||||
return `When this piece promotes: ${narrateChildrenClause(children, ctx)}.`;
|
||||
},
|
||||
"on-check-received": (params, ctx) => {
|
||||
const p = params as { primitives?: unknown } | null | undefined;
|
||||
const children = Array.isArray(p?.primitives)
|
||||
? (p.primitives as readonly EffectPrimitiveNode[])
|
||||
: [];
|
||||
return `When this piece is checked: ${narrateChildrenClause(children, ctx)}.`;
|
||||
},
|
||||
"on-check-delivered": (params, ctx) => {
|
||||
const p = params as { primitives?: unknown } | null | undefined;
|
||||
const children = Array.isArray(p?.primitives)
|
||||
? (p.primitives as readonly EffectPrimitiveNode[])
|
||||
: [];
|
||||
return `When this piece delivers check: ${narrateChildrenClause(children, ctx)}.`;
|
||||
},
|
||||
"on-moved-onto-square": (params, ctx) => {
|
||||
const p = params as
|
||||
| { filter?: unknown; primitives?: unknown }
|
||||
| null
|
||||
| undefined;
|
||||
const filterStr = fmtSquareFilter(p?.filter);
|
||||
const children = Array.isArray(p?.primitives)
|
||||
? (p.primitives as readonly EffectPrimitiveNode[])
|
||||
: [];
|
||||
return `When this piece moves onto ${filterStr}: ${narrateChildrenClause(children, ctx)}.`;
|
||||
},
|
||||
"on-captured": (params, ctx) => {
|
||||
const p = params as
|
||||
| { target?: unknown; primitives?: unknown }
|
||||
| null
|
||||
| undefined;
|
||||
const children = Array.isArray(p?.primitives)
|
||||
? (p.primitives as readonly EffectPrimitiveNode[])
|
||||
: [];
|
||||
const target = p?.target === undefined ? "self" : fmtTarget(p.target);
|
||||
const prefix =
|
||||
target === "self"
|
||||
? "When this piece is captured"
|
||||
: `When this piece is captured (apply to ${target})`;
|
||||
return `${prefix}: ${narrateChildrenClause(children, ctx)}.`;
|
||||
},
|
||||
};
|
||||
|
||||
// ──────────────────────────────────────────────────────────────────
|
||||
// Entry points
|
||||
// ──────────────────────────────────────────────────────────────────
|
||||
|
||||
/** Default fallback for unknown kinds — graceful degradation. */
|
||||
function defaultNarrator(node: EffectPrimitiveNode): string {
|
||||
return `unknown primitive: ${node.kind}`;
|
||||
}
|
||||
|
||||
function narrateNodeInternal(
|
||||
node: EffectPrimitiveNode,
|
||||
ctx: WalkContext,
|
||||
): string {
|
||||
const narrator = KIND_NARRATORS[node.kind];
|
||||
if (narrator === undefined) return defaultNarrator(node);
|
||||
return narrator(node.params, ctx);
|
||||
}
|
||||
|
||||
/**
|
||||
* Narrate a raw list of primitive nodes. Joined with ". " for prose
|
||||
* flow; triggers already terminate their own sentences with ".", so
|
||||
* adjacent punctuation is suppressed by a small cleanup pass.
|
||||
*/
|
||||
export function narrateNodes(nodes: readonly EffectPrimitiveNode[]): string {
|
||||
if (nodes.length === 0) return "No effect.";
|
||||
const ctx = newContext();
|
||||
const parts: string[] = [];
|
||||
let rendered = 0;
|
||||
for (const node of nodes) {
|
||||
if (ctx.budgetExceeded) {
|
||||
ctx.skipped += 1;
|
||||
continue;
|
||||
}
|
||||
if (ctx.visited.has(node)) {
|
||||
parts.push("…");
|
||||
continue;
|
||||
}
|
||||
ctx.visited.add(node);
|
||||
const piece = narrateNodeInternal(node, ctx);
|
||||
ctx.visited.delete(node);
|
||||
parts.push(piece);
|
||||
rendered += 1;
|
||||
// Check budget against the joined candidate length.
|
||||
if (joinParts(parts).length > MAX_NARRATIVE_CHARS) {
|
||||
ctx.budgetExceeded = true;
|
||||
}
|
||||
}
|
||||
// Count unrendered tail if we cut short mid-loop.
|
||||
if (ctx.budgetExceeded) {
|
||||
ctx.skipped += nodes.length - rendered;
|
||||
}
|
||||
let out = joinParts(parts);
|
||||
if (out.length > MAX_NARRATIVE_CHARS || ctx.skipped > 0) {
|
||||
out = truncateWithSuffix(out, ctx.skipped);
|
||||
}
|
||||
return out;
|
||||
}
|
||||
|
||||
function joinParts(parts: readonly string[]): string {
|
||||
// Add ". " between parts, but avoid ".." when a part already ends
|
||||
// with "." (trigger narrators do).
|
||||
let out = "";
|
||||
for (let i = 0; i < parts.length; i += 1) {
|
||||
const p = parts[i];
|
||||
if (p === undefined) continue;
|
||||
if (out.length > 0) {
|
||||
out += p.startsWith(" ") ? "" : " ";
|
||||
}
|
||||
out += p;
|
||||
// Ensure sentence break between sibling primitives.
|
||||
if (i < parts.length - 1 && !p.endsWith(".") && !p.endsWith("…")) {
|
||||
out += ".";
|
||||
}
|
||||
}
|
||||
return out;
|
||||
}
|
||||
|
||||
function truncateWithSuffix(text: string, skipped: number): string {
|
||||
const suffix = ` … and ${skipped} more primitive${skipped === 1 ? "" : "s"}`;
|
||||
const available = MAX_NARRATIVE_CHARS - suffix.length;
|
||||
if (available <= 0) {
|
||||
// Pathological: suffix alone already longer than the cap.
|
||||
return suffix.slice(0, MAX_NARRATIVE_CHARS);
|
||||
}
|
||||
const head = text.length > available ? text.slice(0, available) : text;
|
||||
return head + suffix;
|
||||
}
|
||||
|
||||
/**
|
||||
* Top-level entry. Returns a human-readable paragraph describing the
|
||||
* descriptor — its optional description, then the effect narrative.
|
||||
*/
|
||||
export function narrate(descriptor: CustomModifierDescriptor): string {
|
||||
const body = narrateNodes(descriptor.primitives);
|
||||
// Descriptor-level prose (name/description) is the caller's job to
|
||||
// surface if they want; narrate() focuses on the effect semantics so
|
||||
// the preview pane can decide how to frame it. Return the effect
|
||||
// body verbatim.
|
||||
return body;
|
||||
}
|
||||
|
||||
// Re-export for consumers that want to assert on the kind set.
|
||||
export type { PrimitiveKind };
|
||||
Loading…
Add table
Add a link
Reference in a new issue