Codex
57 lines
1.6 KiB
TypeScript
57 lines
1.6 KiB
TypeScript
export const MYSQL_UNSIGNED_INT_MAX = 4_294_967_295;
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export interface LegacyMoneyOptions {
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nullable?: boolean;
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maxCents?: number;
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field?: string;
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}
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function describeField(field: string | undefined): string {
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return field ? ` for ${field}` : '';
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}
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export function legacyDecimalToCents(
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value: unknown,
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options: LegacyMoneyOptions = {}
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): number | null {
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const field = describeField(options.field);
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if (value === null || value === undefined) {
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if (options.nullable) {
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return null;
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}
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throw new Error(`Legacy money value${field} cannot be null.`);
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}
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if (typeof value !== 'string' && typeof value !== 'number') {
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throw new Error(`Legacy money value${field} must be a decimal string or number.`);
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}
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if (typeof value === 'number' && !Number.isFinite(value)) {
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throw new Error(`Legacy money value${field} must be finite.`);
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}
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const decimal = String(value);
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const match = /^(\d+)(?:\.(\d{1,2}))?$/.exec(decimal);
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if (!match) {
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throw new Error(
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`Legacy money value${field} must be a non-negative decimal with at most two fractional digits.`
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);
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}
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const wholeCents = BigInt(match[1]) * 100n;
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const fraction = (match[2] ?? '').padEnd(2, '0');
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const cents = wholeCents + BigInt(fraction || '0');
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const maxCents = options.maxCents ?? MYSQL_UNSIGNED_INT_MAX;
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if (!Number.isSafeInteger(maxCents) || maxCents < 0) {
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throw new Error('Legacy money maxCents must be a non-negative safe integer.');
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}
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if (cents > BigInt(maxCents)) {
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throw new Error(`Legacy money value${field} exceeds the target cents column limit.`);
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}
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return Number(cents);
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}
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