91 lines
2.2 KiB
TypeScript
91 lines
2.2 KiB
TypeScript
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import type { EJSONOptions } from './extended_json';
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/** @public */
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export interface DoubleExtended {
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$numberDouble: string;
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}
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/**
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* A class representation of the BSON Double type.
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* @public
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*/
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export class Double {
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_bsontype!: 'Double';
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value!: number;
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/**
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* Create a Double type
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*
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* @param value - the number we want to represent as a double.
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*/
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constructor(value: number) {
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if (!(this instanceof Double)) return new Double(value);
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if ((value as unknown) instanceof Number) {
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value = value.valueOf();
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}
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this.value = +value;
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}
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/**
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* Access the number value.
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*
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* @returns returns the wrapped double number.
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*/
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valueOf(): number {
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return this.value;
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}
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toJSON(): number {
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return this.value;
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}
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toString(radix?: number): string {
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return this.value.toString(radix);
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}
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/** @internal */
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toExtendedJSON(options?: EJSONOptions): number | DoubleExtended {
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if (options && (options.legacy || (options.relaxed && isFinite(this.value)))) {
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return this.value;
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}
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// NOTE: JavaScript has +0 and -0, apparently to model limit calculations. If a user
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// explicitly provided `-0` then we need to ensure the sign makes it into the output
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if (Object.is(Math.sign(this.value), -0)) {
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return { $numberDouble: `-${this.value.toFixed(1)}` };
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}
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let $numberDouble: string;
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if (Number.isInteger(this.value)) {
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$numberDouble = this.value.toFixed(1);
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if ($numberDouble.length >= 13) {
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$numberDouble = this.value.toExponential(13).toUpperCase();
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}
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} else {
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$numberDouble = this.value.toString();
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}
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return { $numberDouble };
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}
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/** @internal */
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static fromExtendedJSON(doc: DoubleExtended, options?: EJSONOptions): number | Double {
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const doubleValue = parseFloat(doc.$numberDouble);
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return options && options.relaxed ? doubleValue : new Double(doubleValue);
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}
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/** @internal */
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[Symbol.for('nodejs.util.inspect.custom')](): string {
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return this.inspect();
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}
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inspect(): string {
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const eJSON = this.toExtendedJSON() as DoubleExtended;
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return `new Double(${eJSON.$numberDouble})`;
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}
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}
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Object.defineProperty(Double.prototype, '_bsontype', { value: 'Double' });
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