const DEFAULT_SPLIT_RE = /[ ,]/g; const NEWLINE_SPLIT_RE = / /g;

type NormalizeStringListOptions = { maxItems?: number; maxLen?: number; splitPattern?: RegExp; };

function normalizeStringList( source: string[], { maxItems = 20, maxLen = 120 }: NormalizeStringListOptions = {} ) { return [...new Set(source.map((item) => String(item || "").trim()).filter(Boolean))] .slice(0, Math.max(1, maxItems)) .map((item) => item.slice(0, maxLen)); }

export function normalizeBoundedStringList( input: unknown, options: NormalizeStringListOptions = {} ) { if (Array.isArray(input)) { return normalizeStringList(input, options); } if (typeof input !== "string") return []; const splitPattern = options.splitPattern || DEFAULT_SPLIT_RE; return normalizeStringList(input.split(splitPattern), options); }

export function parseUniqueList(value: unknown) { return normalizeBoundedStringList(value, { maxItems: Number.MAX_SAFE_INTEGER, maxLen: Number.MAX_SAFE_INTEGER, splitPattern: DEFAULT_SPLIT_RE }); }

export function parseUniqueLineList(value: unknown) { return normalizeBoundedStringList(value, { maxItems: Number.MAX_SAFE_INTEGER, maxLen: Number.MAX_SAFE_INTEGER, splitPattern: NEWLINE_SPLIT_RE }); }

export function formatLineList(items: unknown) { if (!Array.isArray(items)) return ""; return items.map((item) => String(item || "").trim()).filter(Boolean).join(" "); }

export function formatCommaList(items: unknown) { if (!Array.isArray(items)) return ""; return items.map((item) => String(item || "").trim()).filter(Boolean).join(", "); }