@trailstash/ultra/lib/glyphFallback.js

A web based tool for making MapLibre GL maps with data from sources such as Overpass, GeoJSON, GPX, KML, TCX, etc

export class Protocol {
  static name = "glyphs";
  static makeURL = (url) => {
    const params = new URLSearchParams();
    if (url) {
      params.set("url", url);
    }
    return `${Protocol.name}://origin/{fontstack}/{range}?${params.toString()}`;
  };
  tile = async (params) => {
    const url = new URL(params.url);
    let resp;
    const [fontstack, range] = url.pathname.split("/").slice(-2);
    if (url.searchParams.has("url")) {
      resp = await fetch(
        url.searchParams
          .get("url")
          .replace("{fontstack}", fontstack)
          .replace("{range}", range),
      );
    }
    if (!resp || !resp.ok) {
      resp = await fetch(`./font/${range}.pbf`);
    }
    if (resp) {
      return { data: await resp.arrayBuffer() };
    }
  };
}

export default Protocol;