LukasandClaude Opus 5
be3778a0c9
A D&D stat block opened for a combatant now offers a Min/Avg/Max toggle below the Hit Points line, deriving both ends from the Hit Dice formula (3d6 + 6 -> 9 / 16 / 24). The switch is applied as a delta, so manual HP edits and damage already taken survive it. Unlike the PF2e weak/elite adjustment this is a convenience tool, not a rules mechanic: nothing but HP changes and the combatant is not renamed. The toggle is hidden when the HP field carries prose instead of a dice pool. Also extracts a SegmentedControl primitive. Game system, theme and the PF2e weak/elite toggle were three hand-rolled copies of the same markup, which is why the D&D toggle first came out chunkier and in the wrong accent color. All four now share one definition, and segments expose aria-pressed instead of signalling the active state by color alone. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
59 lines
1.7 KiB
TypeScript
59 lines
1.7 KiB
TypeScript
/** Which end of a creature's Hit Dice range its max HP is taken from. */
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export type HpVariant = "min" | "max";
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export const VALID_HP_VARIANTS: ReadonlySet<string> = new Set(["min", "max"]);
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export interface HpRange {
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/** Every Hit Die rolls a 1 (never below 1 HP). */
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readonly min: number;
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/** The statblock's printed average. */
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readonly average: number;
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/** Every Hit Die rolls its maximum. */
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readonly max: number;
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}
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/**
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* Matches a plain Hit Dice pool: "9d8", "3d6 + 6", "2d6 - 2".
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* Bestiary data uses several dash characters, so hyphen, minus sign, en dash
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* and em dash all count as a negative modifier.
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*/
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const DICE_FORMULA_REGEX =
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/^\s*(\d+)\s*[dD]\s*(\d+)\s*(?:([-+−–—])\s*(\d+))?\s*$/;
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/**
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* Derives the min/average/max HP of a creature from its Hit Dice formula.
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* Returns null when the formula is not a plain dice pool — some sources carry
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* prose (`hp.special`) or an empty string instead.
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*/
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export function hpRange(
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hp: Readonly<{ average: number; formula: string }>,
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): HpRange | null {
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const match = DICE_FORMULA_REGEX.exec(hp.formula);
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if (!match) return null;
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const count = Number(match[1]);
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const sides = Number(match[2]);
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if (count < 1 || sides < 1) return null;
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const modifier =
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match[4] === undefined
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? 0
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: (match[3] === "+" ? 1 : -1) * Number.parseInt(match[4], 10);
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return {
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min: Math.max(1, count + modifier),
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average: hp.average,
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max: Math.max(1, count * sides + modifier),
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};
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}
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/** The HP value a variant selects; undefined means the printed average. */
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export function hpForVariant(
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range: HpRange,
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variant: HpVariant | undefined,
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): number {
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if (variant === "min") return range.min;
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if (variant === "max") return range.max;
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return range.average;
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}
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