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import { posix } from "../deps/path.ts";import { Exception } from "./errors.ts";
import type { Data, Formats, Reader } from "../core.ts";
export interface Options {  /** The reader instance used to read the files */  reader: Reader;
  /** The default _includes directory */  includes: string;
  /** The registered file formats */  formats: Formats;}
/** * Class to load _includes files. */export default class IncludesLoader {  /** The filesystem reader */  reader: Reader;
  /** Default _includes path */  includes: string;
  /** List of extensions to load files and the loader used */  formats: Formats;
  constructor(options: Options) {    this.reader = options.reader;    this.formats = options.formats;    this.includes = options.includes;  }
  async load(path: string, from?: string): Promise<[string, Data] | undefined> {    const entry = this.formats.search(path);
    if (!entry) {      return;    }
    const [, format] = entry;
    if (!format.pageLoader) {      return;    }
    let finalPath: string;
    if (path.startsWith(".")) {      if (!from) {        throw new Exception(`Cannot load "${path}" without a base path`, {          path,        });      }
      finalPath = posix.join("/", posix.dirname(from), path);    } else {      finalPath = posix.join("/", format.includesPath || this.includes, path);    }
    return [      finalPath,      await this.reader.read(finalPath, format.pageLoader),    ];  }}