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import { dirname, join } from "../deps/path.ts";import Extensions from "./extensions.ts";import { Exception } from "./errors.ts";
import type { Data, Loader, Reader } from "../core.ts";
export interface Options {  /** The reader instance used to read the files */  reader: Reader;
  /** The default _includes directory */  includes: string;}
/** * Class to load _includes files. */export default class IncludesLoader {  /** The filesystem reader */  reader: Reader;
  /** To use different includes paths by extension */  paths: Extensions<string>;
  /** List of extensions to load files and the loader used */  loaders = new Extensions<Loader>();
  constructor(options: Options) {    this.reader = options.reader;    this.paths = new Extensions<string>(options.includes);  }
  /** Assign a loader to some extensions */  set(extensions: string[], loader: Loader) {    extensions.forEach((extension) => this.loaders.set(extension, loader));  }
  /** Assign a path to some extensions */  setPath(extensions: string[], path: string) {    extensions.forEach((extension) => this.paths.set(extension, path));  }
  async load(path: string, from?: string): Promise<[string, Data] | undefined> {    const result = this.loaders.search(path);
    if (!result) {      return;    }
    let includesPath: string;
    if (path.startsWith(".")) {      if (!from) {        throw new Exception(`Cannot load "${path}" without a base path`, {          path,        });      }
      includesPath = join("/", dirname(from), path);    } else {      const entry = this.paths.search(path)!;      includesPath = join("/", entry[1], path);    }
    const [, loader] = result;
    return [      includesPath,      await this.reader.read(includesPath, loader),    ];  }}