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import { posix } from "../deps/path.ts";import { Exception } from "./errors.ts";
import type { Data, Format, 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;
  /** Default _includes path */  includes: string;
  constructor(options: Options) {    this.reader = options.reader;    this.includes = options.includes;  }
  resolve(path: string, format: Format, from?: string): string | undefined {    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;  }
  async load(    path: string,    format: Format,    from?: string,  ): Promise<[string, Data] | undefined> {    const finalPath = this.resolve(path, format, from);
    if (!finalPath || !format.pageLoader) {      return;    }
    return [      finalPath,      await this.reader.read(finalPath, format.pageLoader),    ];  }}