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import { matchExtension } from "./utils/path.ts";
import type { Extensions } from "./utils/path.ts";import type { Page } from "./file.ts";
/** * Class to store and run the (pre)processors */export default class Processors {  /** Processors and the assigned extensions */  processors = new Map<Processor, Extensions>();
  /** Assign a processor to some extensions */  set(extensions: Extensions, processor: Processor): void {    if (Array.isArray(extensions)) {      extensions.forEach((extension) => {        if (extension.charAt(0) !== ".") {          throw new Error(            `Invalid extension ${extension}. It must start with '.'`,          );        }      });    }
    this.processors.set(processor, extensions);  }
  /** Apply the processors to the provided pages */  async run(pages: Page[]): Promise<void> {    for (const [process, extensions] of this.processors) {      const filtered = pages.filter((page) => pageMatches(extensions, page));      await (process as Processor)(filtered, pages);    }  }}
/** * Processor callback is used in both (pre)process methods. */export type Processor = (  filteredPages: Page[],  allPages: Page[],) => void | false | Promise<void | false>;
function pageMatches(exts: Extensions, page: Page): boolean {  if (exts === "*") {    return true;  }
  if (page.src.ext && exts.includes(page.src.ext)) {    return true;  }
  const url = page.outputPath;
  return matchExtension(exts, url);}