@remix-run/headers/dist/lib/content-range.js

A toolkit for working with HTTP headers in JavaScript

import {} from "./header-value.js";
/**
 * The value of a `Content-Range` HTTP header.
 *
 * [MDN `Content-Range` Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Range)
 *
 * [HTTP/1.1 Specification](https://httpwg.org/specs/rfc9110.html#field.content-range)
 */
export class ContentRange {
    unit = '';
    start = null;
    end = null;
    size;
    /**
     * @param init A string or object to initialize the header
     */
    constructor(init) {
        if (init) {
            if (typeof init === 'string') {
                // Parse: "bytes 200-1000/67589" or "bytes */67589" or "bytes 200-1000/*"
                let match = init.match(/^(\w+)\s+(?:(\d+)-(\d+)|\*)\/((?:\d+|\*))$/);
                if (match) {
                    this.unit = match[1];
                    this.start = match[2] ? parseInt(match[2], 10) : null;
                    this.end = match[3] ? parseInt(match[3], 10) : null;
                    this.size = match[4] === '*' ? '*' : parseInt(match[4], 10);
                }
            }
            else {
                if (init.unit !== undefined)
                    this.unit = init.unit;
                if (init.start !== undefined)
                    this.start = init.start;
                if (init.end !== undefined)
                    this.end = init.end;
                if (init.size !== undefined)
                    this.size = init.size;
            }
        }
    }
    /**
     * Returns the string representation of the header value.
     *
     * @return The header value as a string
     */
    toString() {
        if (!this.unit || this.size === undefined)
            return '';
        let range = this.start !== null && this.end !== null ? `${this.start}-${this.end}` : '*';
        return `${this.unit} ${range}/${this.size}`;
    }
}