65 lines
2.1 KiB
TypeScript
65 lines
2.1 KiB
TypeScript
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// 極簡 5 欄位 cron 比對：minute hour day-of-month month day-of-week。
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// 支援星號、步進(星號斜線n)、列表(a,b,c)、範圍(a-b)、單一數字。
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// 給 worker 每分鐘輪詢時判斷規則是否「到點」。
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function fieldMatches(field: string, value: number, min: number, max: number): boolean {
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if (field === "*") return true;
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for (const part of field.split(",")) {
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const token = part.trim();
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if (token === "") continue;
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// step: */n 或 a-b/n 或 */n
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const stepMatch = token.match(/^(\*|\d+(?:-\d+)?)\/(\d+)$/);
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if (stepMatch) {
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const step = parseInt(stepMatch[2], 10);
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if (step <= 0) continue;
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let rangeStart = min;
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let rangeEnd = max;
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if (stepMatch[1] !== "*") {
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const rangeParts = stepMatch[1].split("-");
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rangeStart = parseInt(rangeParts[0], 10);
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rangeEnd = rangeParts[1] !== undefined ? parseInt(rangeParts[1], 10) : max;
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}
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if (value < rangeStart || value > rangeEnd) continue;
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if ((value - rangeStart) % step === 0) return true;
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continue;
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}
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// range: a-b
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const rangeMatch = token.match(/^(\d+)-(\d+)$/);
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if (rangeMatch) {
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const start = parseInt(rangeMatch[1], 10);
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const end = parseInt(rangeMatch[2], 10);
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if (value >= start && value <= end) return true;
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continue;
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}
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// single
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if (/^\d+$/.test(token) && parseInt(token, 10) === value) return true;
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}
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return false;
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}
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export function isValidCron(expr: string): boolean {
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const fields = expr.trim().split(/\s+/);
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return fields.length === 5;
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}
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export function cronMatches(expr: string, date: Date = new Date()): boolean {
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const fields = expr.trim().split(/\s+/);
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if (fields.length !== 5) return false;
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const [minute, hour, dom, month, dow] = fields;
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const normalizedDow = date.getDay(); // 0-6 (Sun=0)
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return (
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fieldMatches(minute, date.getMinutes(), 0, 59) &&
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fieldMatches(hour, date.getHours(), 0, 23) &&
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fieldMatches(dom, date.getDate(), 1, 31) &&
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fieldMatches(month, date.getMonth() + 1, 1, 12) &&
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fieldMatches(dow, normalizedDow, 0, 6)
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);
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}
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