Method parse

csv/parse.ts:207–271

(input: string)

    return result;
  }
  parse(input: string): string[][] {
    this.#input = input.startsWith(BYTE_ORDER_MARK) ? input.slice(1) : input;
    this.#cursor = 0;
    const result: string[][] = [];

    let lineResult: string[];
    let first = true;
    let lineIndex = 0;

    const INVALID_RUNE = ["\r", "\n", '"'];

    const options = this.#options;
    if (
      INVALID_RUNE.includes(options.separator) ||
      (typeof options.comment === "string" &&
        INVALID_RUNE.includes(options.comment)) ||
      options.separator === options.comment
    ) {
      throw new Error("Cannot parse input: invalid delimiter");
    }

    // The number of fields per record that is either inferred from the first
    // row (when options.fieldsPerRecord = 0), or set by the caller (when
    // options.fieldsPerRecord > 0).
    //
    // Each possible variant means the following:
    // "ANY": Variable number of fields is allowed.
    // "UNINITIALIZED": The first row has not been read yet. Once it's read, the
    //                  number of fields will be set.
    // <number>: The number of fields per record that every record must follow.
    let _nbFields: "ANY" | "UNINITIALIZED" | number;
    if (options.fieldsPerRecord === undefined || options.fieldsPerRecord < 0) {
      _nbFields = "ANY";
    } else if (options.fieldsPerRecord === 0) {
      _nbFields = "UNINITIALIZED";
    } else {
      // TODO: Should we check if it's a valid integer?
      _nbFields = options.fieldsPerRecord;
    }

    while (true) {
      const r = this.#parseRecord(lineIndex);
      if (r === null) break;
      lineResult = r;
      lineIndex++;
      // If fieldsPerRecord is 0, Read sets it to
      // the number of fields in the first record
      if (first) {
        first = false;
        if (_nbFields === "UNINITIALIZED") {
          _nbFields = lineResult.length;
        }
      }

      if (lineResult.length > 0) {
        if (typeof _nbFields === "number" && _nbFields !== lineResult.length) {
          throw new SyntaxError(
            `Syntax error on line ${lineIndex}: expected ${_nbFields} fields but got ${lineResult.length}`,