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import { BSONError } from "./error.ts";import { EJSONOptions } from "./extended_json.ts";
function alphabetize(str: string): string {  return str.split("").sort().join("");}
export interface BSONRegExpExtended {  $regularExpression: {    pattern: string;    options: string;  };}
/** * A class representation of the BSON RegExp type. * @public */export class BSONRegExp {  pattern!: string;  options!: string;  _bsontype = "BSONRegExp";  /**   * @param pattern - The regular expression pattern to match   * @param options - The regular expression options   */  constructor(pattern: string, options?: string) {    this.pattern = pattern;    this.options = alphabetize(options ?? "");
    if (this.pattern.indexOf("\x00") !== -1) {      throw new BSONError(        `BSON Regex patterns cannot contain null bytes, found: ${          JSON.stringify(this.pattern)        }`,      );    }    if (this.options.indexOf("\x00") !== -1) {      throw new BSONError(        `BSON Regex options cannot contain null bytes, found: ${          JSON.stringify(this.options)        }`,      );    }
    // Validate options    for (let i = 0; i < this.options.length; i++) {      if (        !(          this.options[i] === "i" ||          this.options[i] === "m" ||          this.options[i] === "x" ||          this.options[i] === "l" ||          this.options[i] === "s" ||          this.options[i] === "u"        )      ) {        throw new BSONError(          `The regular expression option [${this.options[i]}] is not supported`,        );      }    }  }
  static parseOptions(options?: string): string {    return options ? options.split("").sort().join("") : "";  }
  [Symbol.for("Deno.customInspect")](): string {    return `new BSONRegExp("${this.pattern}")`;  }
  /** @internal */  toExtendedJSON(    options?: EJSONOptions,  ): BSONRegExpExtended {    options = options || {};    return {      $regularExpression: { pattern: this.pattern, options: this.options },    };  }
  /** @internal */  static fromExtendedJSON(    doc: BSONRegExpExtended,  ): BSONRegExp {    return new BSONRegExp(      doc.$regularExpression.pattern,      BSONRegExp.parseOptions(doc.$regularExpression.options),    );  }}