Function validateDetailed

src/pattern/validation/pattern-validation.ts:158–192

(pattern: string)

 * Useful for tooling, editors and DX.
 */
export function validateDetailed(pattern: string): DetailedValidation {
    if (typeof pattern !== 'string')
        return { valid: false, errors: [{ field: 'expression', message: 'pattern must be a string' }] };

    if (!ALLOWED_CHARS_REGEX.test(pattern))
        return { valid: false, errors: [{ field: 'expression', value: pattern, message: 'pattern includes illegal characters' }] };

    const raw = pattern.replace(/\s{2,}/g, ' ').trim().split(' ');
    if (raw.length !== 5 && raw.length !== 6)
        return { valid: false, errors: [{ field: 'expression', value: pattern, message: `expected 5 or 6 fields but got ${raw.length}` }] };

    const patterns = raw.length === 5 ? ['0', ...raw] : raw;
    const executable = convertExpression(pattern);

    const errors: CronFieldError[] = [];
    FIELDS.forEach((f, i) => {
        if (f.invalid(executable[i]))
            errors.push({ field: f.key, value: patterns[i], message: `${patterns[i]} is a invalid expression for ${f.label}` });
    });

    if (errors.length) return { valid: false, errors };

    return {
        valid: true,
        errors: [],
        fields: {
            second: executable[0],
            minute: executable[1],
            hour: executable[2],
            dayOfMonth: executable[3],
            month: executable[4],
            dayOfWeek: executable[5],
        },
    };
}

/**
 * Parses an expression into its decomposed fields, or throws an Error with a