'use strict';

var stream = require('stream');

const is_object = function (obj) {
  return typeof obj === "object" && obj !== null && !Array.isArray(obj);
};

class CsvError extends Error {
  constructor(code, message, options, ...contexts) {
    if (Array.isArray(message)) message = message.join(" ").trim();
    super(message);
    if (Error.captureStackTrace !== undefined) {
      Error.captureStackTrace(this, CsvError);
    }
    this.code = code;
    for (const context of contexts) {
      for (const key in context) {
        const value = context[key];
        this[key] = Buffer.isBuffer(value)
          ? value.toString(options.encoding)
          : value == null
            ? value
            : JSON.parse(JSON.stringify(value));
      }
    }
  }
}

const normalize_columns_array = function (columns) {
  const normalizedColumns = [];
  for (let i = 0, l = columns.length; i < l; i++) {
    const column = columns[i];
    if (column === undefined || column === null || column === false) {
      normalizedColumns[i] = { disabled: true };
    } else if (typeof column === "string") {
      normalizedColumns[i] = { name: column };
    } else if (is_object(column)) {
      if (typeof column.name !== "string") {
        throw new CsvError("CSV_OPTION_COLUMNS_MISSING_NAME", [
          "Option columns missing name:",
          `property "name" is required at position ${i}`,
          "when column is an object literal",
        ]);
      }
      normalizedColumns[i] = column;
    } else {
      throw new CsvError("CSV_INVALID_COLUMN_DEFINITION", [
        "Invalid column definition:",
        "expect a string or a literal object,",
        `got ${JSON.stringify(column)} at position ${i}`,
      ]);
    }
  }
  return normalizedColumns;
};

class ResizeableBuffer {
  constructor(size = 100) {
    this.size = size;
    this.length = 0;
    this.buf = Buffer.allocUnsafe(size);
  }
  prepend(val) {
    if (Buffer.isBuffer(val)) {
      const length = this.length + val.length;
      if (length >= this.size) {
        this.resize();
        if (length >= this.size) {
          throw Error("INVALID_BUFFER_STATE");
        }
      }
      const buf = this.buf;
      this.buf = Buffer.allocUnsafe(this.size);
      val.copy(this.buf, 0);
      buf.copy(this.buf, val.length);
      this.length += val.length;
    } else {
      const length = this.length++;
      if (length === this.size) {
        this.resize();
      }
      const buf = this.clone();
      this.buf[0] = val;
      buf.copy(this.buf, 1, 0, length);
    }
  }
  append(val) {
    const length = this.length++;
    if (length === this.size) {
      this.resize();
    }
    this.buf[length] = val;
  }
  clone() {
    return Buffer.from(this.buf.slice(0, this.length));
  }
  resize() {
    const length = this.length;
    this.size = this.size * 2;
    const buf = Buffer.allocUnsafe(this.size);
    this.buf.copy(buf, 0, 0, length);
    this.buf = buf;
  }
  toString(encoding) {
    if (encoding) {
      return this.buf.slice(0, this.length).toString(encoding);
    } else {
      return Uint8Array.prototype.slice.call(this.buf.slice(0, this.length));
    }
  }
  toJSON() {
    return this.toString("utf8");
  }
  reset() {
    this.length = 0;
  }
}

// white space characters
// https://en.wikipedia.org/wiki/Whitespace_character
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Character_Classes#Types
// \f\n\r\t\v\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff
const np = 12;
const cr$1 = 13; // `\r`, carriage return, 0x0D in hexadécimal, 13 in decimal
const nl$1 = 10; // `\n`, newline, 0x0A in hexadecimal, 10 in decimal
const space = 32;
const tab = 9;

const init_state = function (options) {
  return {
    bomSkipped: false,
    bufBytesStart: 0,
    castField: options.cast_function,
    commenting: false,
    // Current error encountered by a record
    error: undefined,
    enabled: options.from_line === 1,
    escaping: false,
    escapeIsQuote:
      Buffer.isBuffer(options.escape) &&
      Buffer.isBuffer(options.quote) &&
      Buffer.compare(options.escape, options.quote) === 0,
    // columns can be `false`, `true`, `Array`
    expectedRecordLength: Array.isArray(options.columns)
      ? options.columns.length
      : undefined,
    field: new ResizeableBuffer(20),
    firstLineToHeaders: options.cast_first_line_to_header,
    needMoreDataSize: Math.max(
      // Skip if the remaining buffer smaller than comment
      options.comment !== null ? options.comment.length : 0,
      // Skip if the remaining buffer can be delimiter
      ...options.delimiter.map((delimiter) => delimiter.length),
      // Skip if the remaining buffer can be escape sequence
      options.quote !== null ? options.quote.length : 0,
    ),
    previousBuf: undefined,
    quoting: false,
    stop: false,
    rawBuffer: new ResizeableBuffer(100),
    record: [],
    recordHasError: false,
    record_length: 0,
    recordDelimiterMaxLength:
      options.record_delimiter.length === 0
        ? 0
        : Math.max(...options.record_delimiter.map((v) => v.length)),
    trimChars: [
      Buffer.from(" ", options.encoding)[0],
      Buffer.from("\t", options.encoding)[0],
    ],
    wasQuoting: false,
    wasRowDelimiter: false,
    timchars: [
      Buffer.from(Buffer.from([cr$1], "utf8").toString(), options.encoding),
      Buffer.from(Buffer.from([nl$1], "utf8").toString(), options.encoding),
      Buffer.from(Buffer.from([np], "utf8").toString(), options.encoding),
      Buffer.from(Buffer.from([space], "utf8").toString(), options.encoding),
      Buffer.from(Buffer.from([tab], "utf8").toString(), options.encoding),
    ],
  };
};

const underscore = function (str) {
  return str.replace(/([A-Z])/g, function (_, match) {
    return "_" + match.toLowerCase();
  });
};

const normalize_options = function (opts) {
  const options = {};
  // Merge with user options
  for (const opt in opts) {
    options[underscore(opt)] = opts[opt];
  }
  // Normalize option `encoding`
  // Note: defined first because other options depends on it
  // to convert chars/strings into buffers.
  if (options.encoding === undefined || options.encoding === true) {
    options.encoding = "utf8";
  } else if (options.encoding === null || options.encoding === false) {
    options.encoding = null;
  } else if (
    typeof options.encoding !== "string" &&
    options.encoding !== null
  ) {
    throw new CsvError(
      "CSV_INVALID_OPTION_ENCODING",
      [
        "Invalid option encoding:",
        "encoding must be a string or null to return a buffer,",
        `got ${JSON.stringify(options.encoding)}`,
      ],
      options,
    );
  }
  // Normalize option `bom`
  if (
    options.bom === undefined ||
    options.bom === null ||
    options.bom === false
  ) {
    options.bom = false;
  } else if (options.bom !== true) {
    throw new CsvError(
      "CSV_INVALID_OPTION_BOM",
      [
        "Invalid option bom:",
        "bom must be true,",
        `got ${JSON.stringify(options.bom)}`,
      ],
      options,
    );
  }
  // Normalize option `cast`
  options.cast_function = null;
  if (
    options.cast === undefined ||
    options.cast === null ||
    options.cast === false ||
    options.cast === ""
  ) {
    options.cast = undefined;
  } else if (typeof options.cast === "function") {
    options.cast_function = options.cast;
    options.cast = true;
  } else if (options.cast !== true) {
    throw new CsvError(
      "CSV_INVALID_OPTION_CAST",
      [
        "Invalid option cast:",
        "cast must be true or a function,",
        `got ${JSON.stringify(options.cast)}`,
      ],
      options,
    );
  }
  // Normalize option `cast_date`
  if (
    options.cast_date === undefined ||
    options.cast_date === null ||
    options.cast_date === false ||
    options.cast_date === ""
  ) {
    options.cast_date = false;
  } else if (options.cast_date === true) {
    options.cast_date = function (value) {
      const date = Date.parse(value);
      return !isNaN(date) ? new Date(date) : value;
    };
  } else if (typeof options.cast_date !== "function") {
    throw new CsvError(
      "CSV_INVALID_OPTION_CAST_DATE",
      [
        "Invalid option cast_date:",
        "cast_date must be true or a function,",
        `got ${JSON.stringify(options.cast_date)}`,
      ],
      options,
    );
  }
  // Normalize option `columns`
  options.cast_first_line_to_header = null;
  if (options.columns === true) {
    // Fields in the first line are converted as-is to columns
    options.cast_first_line_to_header = undefined;
  } else if (typeof options.columns === "function") {
    options.cast_first_line_to_header = options.columns;
    options.columns = true;
  } else if (Array.isArray(options.columns)) {
    options.columns = normalize_columns_array(options.columns);
  } else if (
    options.columns === undefined ||
    options.columns === null ||
    options.columns === false
  ) {
    options.columns = false;
  } else {
    throw new CsvError(
      "CSV_INVALID_OPTION_COLUMNS",
      [
        "Invalid option columns:",
        "expect an array, a function or true,",
        `got ${JSON.stringify(options.columns)}`,
      ],
      options,
    );
  }
  // Normalize option `group_columns_by_name`
  if (
    options.group_columns_by_name === undefined ||
    options.group_columns_by_name === null ||
    options.group_columns_by_name === false
  ) {
    options.group_columns_by_name = false;
  } else if (options.group_columns_by_name !== true) {
    throw new CsvError(
      "CSV_INVALID_OPTION_GROUP_COLUMNS_BY_NAME",
      [
        "Invalid option group_columns_by_name:",
        "expect an boolean,",
        `got ${JSON.stringify(options.group_columns_by_name)}`,
      ],
      options,
    );
  } else if (options.columns === false) {
    throw new CsvError(
      "CSV_INVALID_OPTION_GROUP_COLUMNS_BY_NAME",
      [
        "Invalid option group_columns_by_name:",
        "the `columns` mode must be activated.",
      ],
      options,
    );
  }
  // Normalize option `comment`
  if (
    options.comment === undefined ||
    options.comment === null ||
    options.comment === false ||
    options.comment === ""
  ) {
    options.comment = null;
  } else {
    if (typeof options.comment === "string") {
      options.comment = Buffer.from(options.comment, options.encoding);
    }
    if (!Buffer.isBuffer(options.comment)) {
      throw new CsvError(
        "CSV_INVALID_OPTION_COMMENT",
        [
          "Invalid option comment:",
          "comment must be a buffer or a string,",
          `got ${JSON.stringify(options.comment)}`,
        ],
        options,
      );
    }
  }
  // Normalize option `comment_no_infix`
  if (
    options.comment_no_infix === undefined ||
    options.comment_no_infix === null ||
    options.comment_no_infix === false
  ) {
    options.comment_no_infix = false;
  } else if (options.comment_no_infix !== true) {
    throw new CsvError(
      "CSV_INVALID_OPTION_COMMENT",
      [
        "Invalid option comment_no_infix:",
        "value must be a boolean,",
        `got ${JSON.stringify(options.comment_no_infix)}`,
      ],
      options,
    );
  }
  // Normalize option `delimiter`
  const delimiter_json = JSON.stringify(options.delimiter);
  if (!Array.isArray(options.delimiter))
    options.delimiter = [options.delimiter];
  if (options.delimiter.length === 0) {
    throw new CsvError(
      "CSV_INVALID_OPTION_DELIMITER",
      [
        "Invalid option delimiter:",
        "delimiter must be a non empty string or buffer or array of string|buffer,",
        `got ${delimiter_json}`,
      ],
      options,
    );
  }
  options.delimiter = options.delimiter.map(function (delimiter) {
    if (delimiter === undefined || delimiter === null || delimiter === false) {
      return Buffer.from(",", options.encoding);
    }
    if (typeof delimiter === "string") {
      delimiter = Buffer.from(delimiter, options.encoding);
    }
    if (!Buffer.isBuffer(delimiter) || delimiter.length === 0) {
      throw new CsvError(
        "CSV_INVALID_OPTION_DELIMITER",
        [
          "Invalid option delimiter:",
          "delimiter must be a non empty string or buffer or array of string|buffer,",
          `got ${delimiter_json}`,
        ],
        options,
      );
    }
    return delimiter;
  });
  // Normalize option `escape`
  if (options.escape === undefined || options.escape === true) {
    options.escape = Buffer.from('"', options.encoding);
  } else if (typeof options.escape === "string") {
    options.escape = Buffer.from(options.escape, options.encoding);
  } else if (options.escape === null || options.escape === false) {
    options.escape = null;
  }
  if (options.escape !== null) {
    if (!Buffer.isBuffer(options.escape)) {
      throw new Error(
        `Invalid Option: escape must be a buffer, a string or a boolean, got ${JSON.stringify(options.escape)}`,
      );
    }
  }
  // Normalize option `from`
  if (options.from === undefined || options.from === null) {
    options.from = 1;
  } else {
    if (typeof options.from === "string" && /\d+/.test(options.from)) {
      options.from = parseInt(options.from);
    }
    if (Number.isInteger(options.from)) {
      if (options.from < 0) {
        throw new Error(
          `Invalid Option: from must be a positive integer, got ${JSON.stringify(opts.from)}`,
        );
      }
    } else {
      throw new Error(
        `Invalid Option: from must be an integer, got ${JSON.stringify(options.from)}`,
      );
    }
  }
  // Normalize option `from_line`
  if (options.from_line === undefined || options.from_line === null) {
    options.from_line = 1;
  } else {
    if (
      typeof options.from_line === "string" &&
      /\d+/.test(options.from_line)
    ) {
      options.from_line = parseInt(options.from_line);
    }
    if (Number.isInteger(options.from_line)) {
      if (options.from_line <= 0) {
        throw new Error(
          `Invalid Option: from_line must be a positive integer greater than 0, got ${JSON.stringify(opts.from_line)}`,
        );
      }
    } else {
      throw new Error(
        `Invalid Option: from_line must be an integer, got ${JSON.stringify(opts.from_line)}`,
      );
    }
  }
  // Normalize options `ignore_last_delimiters`
  if (
    options.ignore_last_delimiters === undefined ||
    options.ignore_last_delimiters === null
  ) {
    options.ignore_last_delimiters = false;
  } else if (typeof options.ignore_last_delimiters === "number") {
    options.ignore_last_delimiters = Math.floor(options.ignore_last_delimiters);
    if (options.ignore_last_delimiters === 0) {
      options.ignore_last_delimiters = false;
    }
  } else if (typeof options.ignore_last_delimiters !== "boolean") {
    throw new CsvError(
      "CSV_INVALID_OPTION_IGNORE_LAST_DELIMITERS",
      [
        "Invalid option `ignore_last_delimiters`:",
        "the value must be a boolean value or an integer,",
        `got ${JSON.stringify(options.ignore_last_delimiters)}`,
      ],
      options,
    );
  }
  if (options.ignore_last_delimiters === true && options.columns === false) {
    throw new CsvError(
      "CSV_IGNORE_LAST_DELIMITERS_REQUIRES_COLUMNS",
      [
        "The option `ignore_last_delimiters`",
        "requires the activation of the `columns` option",
      ],
      options,
    );
  }
  // Normalize option `info`
  if (
    options.info === undefined ||
    options.info === null ||
    options.info === false
  ) {
    options.info = false;
  } else if (options.info !== true) {
    throw new Error(
      `Invalid Option: info must be true, got ${JSON.stringify(options.info)}`,
    );
  }
  // Normalize option `max_record_size`
  if (
    options.max_record_size === undefined ||
    options.max_record_size === null ||
    options.max_record_size === false
  ) {
    options.max_record_size = 0;
  } else if (
    Number.isInteger(options.max_record_size) &&
    options.max_record_size >= 0
  ) ; else if (
    typeof options.max_record_size === "string" &&
    /\d+/.test(options.max_record_size)
  ) {
    options.max_record_size = parseInt(options.max_record_size);
  } else {
    throw new Error(
      `Invalid Option: max_record_size must be a positive integer, got ${JSON.stringify(options.max_record_size)}`,
    );
  }
  // Normalize option `objname`
  if (
    options.objname === undefined ||
    options.objname === null ||
    options.objname === false
  ) {
    options.objname = undefined;
  } else if (Buffer.isBuffer(options.objname)) {
    if (options.objname.length === 0) {
      throw new Error(`Invalid Option: objname must be a non empty buffer`);
    }
    if (options.encoding === null) ; else {
      options.objname = options.objname.toString(options.encoding);
    }
  } else if (typeof options.objname === "string") {
    if (options.objname.length === 0) {
      throw new Error(`Invalid Option: objname must be a non empty string`);
    }
    // Great, nothing to do
  } else if (typeof options.objname === "number") ; else {
    throw new Error(
      `Invalid Option: objname must be a string or a buffer, got ${options.objname}`,
    );
  }
  if (options.objname !== undefined) {
    if (typeof options.objname === "number") {
      if (options.columns !== false) {
        throw Error(
          "Invalid Option: objname index cannot be combined with columns or be defined as a field",
        );
      }
    } else {
      // A string or a buffer
      if (options.columns === false) {
        throw Error(
          "Invalid Option: objname field must be combined with columns or be defined as an index",
        );
      }
    }
  }
  // Normalize option `on_record`
  if (options.on_record === undefined || options.on_record === null) {
    options.on_record = undefined;
  } else if (typeof options.on_record !== "function") {
    throw new CsvError(
      "CSV_INVALID_OPTION_ON_RECORD",
      [
        "Invalid option `on_record`:",
        "expect a function,",
        `got ${JSON.stringify(options.on_record)}`,
      ],
      options,
    );
  }
  // Normalize option `on_skip`
  // options.on_skip ??= (err, chunk) => {
  //   this.emit('skip', err, chunk);
  // };
  if (
    options.on_skip !== undefined &&
    options.on_skip !== null &&
    typeof options.on_skip !== "function"
  ) {
    throw new Error(
      `Invalid Option: on_skip must be a function, got ${JSON.stringify(options.on_skip)}`,
    );
  }
  // Normalize option `quote`
  if (
    options.quote === null ||
    options.quote === false ||
    options.quote === ""
  ) {
    options.quote = null;
  } else {
    if (options.quote === undefined || options.quote === true) {
      options.quote = Buffer.from('"', options.encoding);
    } else if (typeof options.quote === "string") {
      options.quote = Buffer.from(options.quote, options.encoding);
    }
    if (!Buffer.isBuffer(options.quote)) {
      throw new Error(
        `Invalid Option: quote must be a buffer or a string, got ${JSON.stringify(options.quote)}`,
      );
    }
  }
  // Normalize option `raw`
  if (
    options.raw === undefined ||
    options.raw === null ||
    options.raw === false
  ) {
    options.raw = false;
  } else if (options.raw !== true) {
    throw new Error(
      `Invalid Option: raw must be true, got ${JSON.stringify(options.raw)}`,
    );
  }
  // Normalize option `record_delimiter`
  if (options.record_delimiter === undefined) {
    options.record_delimiter = [];
  } else if (
    typeof options.record_delimiter === "string" ||
    Buffer.isBuffer(options.record_delimiter)
  ) {
    if (options.record_delimiter.length === 0) {
      throw new CsvError(
        "CSV_INVALID_OPTION_RECORD_DELIMITER",
        [
          "Invalid option `record_delimiter`:",
          "value must be a non empty string or buffer,",
          `got ${JSON.stringify(options.record_delimiter)}`,
        ],
        options,
      );
    }
    options.record_delimiter = [options.record_delimiter];
  } else if (!Array.isArray(options.record_delimiter)) {
    throw new CsvError(
      "CSV_INVALID_OPTION_RECORD_DELIMITER",
      [
        "Invalid option `record_delimiter`:",
        "value must be a string, a buffer or array of string|buffer,",
        `got ${JSON.stringify(options.record_delimiter)}`,
      ],
      options,
    );
  }
  options.record_delimiter = options.record_delimiter.map(function (rd, i) {
    if (typeof rd !== "string" && !Buffer.isBuffer(rd)) {
      throw new CsvError(
        "CSV_INVALID_OPTION_RECORD_DELIMITER",
        [
          "Invalid option `record_delimiter`:",
          "value must be a string, a buffer or array of string|buffer",
          `at index ${i},`,
          `got ${JSON.stringify(rd)}`,
        ],
        options,
      );
    } else if (rd.length === 0) {
      throw new CsvError(
        "CSV_INVALID_OPTION_RECORD_DELIMITER",
        [
          "Invalid option `record_delimiter`:",
          "value must be a non empty string or buffer",
          `at index ${i},`,
          `got ${JSON.stringify(rd)}`,
        ],
        options,
      );
    }
    if (typeof rd === "string") {
      rd = Buffer.from(rd, options.encoding);
    }
    return rd;
  });
  // Normalize option `relax_column_count`
  if (typeof options.relax_column_count === "boolean") ; else if (
    options.relax_column_count === undefined ||
    options.relax_column_count === null
  ) {
    options.relax_column_count = false;
  } else {
    throw new Error(
      `Invalid Option: relax_column_count must be a boolean, got ${JSON.stringify(options.relax_column_count)}`,
    );
  }
  if (typeof options.relax_column_count_less === "boolean") ; else if (
    options.relax_column_count_less === undefined ||
    options.relax_column_count_less === null
  ) {
    options.relax_column_count_less = false;
  } else {
    throw new Error(
      `Invalid Option: relax_column_count_less must be a boolean, got ${JSON.stringify(options.relax_column_count_less)}`,
    );
  }
  if (typeof options.relax_column_count_more === "boolean") ; else if (
    options.relax_column_count_more === undefined ||
    options.relax_column_count_more === null
  ) {
    options.relax_column_count_more = false;
  } else {
    throw new Error(
      `Invalid Option: relax_column_count_more must be a boolean, got ${JSON.stringify(options.relax_column_count_more)}`,
    );
  }
  // Normalize option `relax_quotes`
  if (typeof options.relax_quotes === "boolean") ; else if (
    options.relax_quotes === undefined ||
    options.relax_quotes === null
  ) {
    options.relax_quotes = false;
  } else {
    throw new Error(
      `Invalid Option: relax_quotes must be a boolean, got ${JSON.stringify(options.relax_quotes)}`,
    );
  }
  // Normalize option `skip_empty_lines`
  if (typeof options.skip_empty_lines === "boolean") ; else if (
    options.skip_empty_lines === undefined ||
    options.skip_empty_lines === null
  ) {
    options.skip_empty_lines = false;
  } else {
    throw new Error(
      `Invalid Option: skip_empty_lines must be a boolean, got ${JSON.stringify(options.skip_empty_lines)}`,
    );
  }
  // Normalize option `skip_records_with_empty_values`
  if (typeof options.skip_records_with_empty_values === "boolean") ; else if (
    options.skip_records_with_empty_values === undefined ||
    options.skip_records_with_empty_values === null
  ) {
    options.skip_records_with_empty_values = false;
  } else {
    throw new Error(
      `Invalid Option: skip_records_with_empty_values must be a boolean, got ${JSON.stringify(options.skip_records_with_empty_values)}`,
    );
  }
  // Normalize option `skip_records_with_error`
  if (typeof options.skip_records_with_error === "boolean") ; else if (
    options.skip_records_with_error === undefined ||
    options.skip_records_with_error === null
  ) {
    options.skip_records_with_error = false;
  } else {
    throw new Error(
      `Invalid Option: skip_records_with_error must be a boolean, got ${JSON.stringify(options.skip_records_with_error)}`,
    );
  }
  // Normalize option `rtrim`
  if (
    options.rtrim === undefined ||
    options.rtrim === null ||
    options.rtrim === false
  ) {
    options.rtrim = false;
  } else if (options.rtrim !== true) {
    throw new Error(
      `Invalid Option: rtrim must be a boolean, got ${JSON.stringify(options.rtrim)}`,
    );
  }
  // Normalize option `ltrim`
  if (
    options.ltrim === undefined ||
    options.ltrim === null ||
    options.ltrim === false
  ) {
    options.ltrim = false;
  } else if (options.ltrim !== true) {
    throw new Error(
      `Invalid Option: ltrim must be a boolean, got ${JSON.stringify(options.ltrim)}`,
    );
  }
  // Normalize option `trim`
  if (
    options.trim === undefined ||
    options.trim === null ||
    options.trim === false
  ) {
    options.trim = false;
  } else if (options.trim !== true) {
    throw new Error(
      `Invalid Option: trim must be a boolean, got ${JSON.stringify(options.trim)}`,
    );
  }
  // Normalize options `trim`, `ltrim` and `rtrim`
  if (options.trim === true && opts.ltrim !== false) {
    options.ltrim = true;
  } else if (options.ltrim !== true) {
    options.ltrim = false;
  }
  if (options.trim === true && opts.rtrim !== false) {
    options.rtrim = true;
  } else if (options.rtrim !== true) {
    options.rtrim = false;
  }
  // Normalize option `to`
  if (options.to === undefined || options.to === null) {
    options.to = -1;
  } else {
    if (typeof options.to === "string" && /\d+/.test(options.to)) {
      options.to = parseInt(options.to);
    }
    if (Number.isInteger(options.to)) {
      if (options.to <= 0) {
        throw new Error(
          `Invalid Option: to must be a positive integer greater than 0, got ${JSON.stringify(opts.to)}`,
        );
      }
    } else {
      throw new Error(
        `Invalid Option: to must be an integer, got ${JSON.stringify(opts.to)}`,
      );
    }
  }
  // Normalize option `to_line`
  if (options.to_line === undefined || options.to_line === null) {
    options.to_line = -1;
  } else {
    if (typeof options.to_line === "string" && /\d+/.test(options.to_line)) {
      options.to_line = parseInt(options.to_line);
    }
    if (Number.isInteger(options.to_line)) {
      if (options.to_line <= 0) {
        throw new Error(
          `Invalid Option: to_line must be a positive integer greater than 0, got ${JSON.stringify(opts.to_line)}`,
        );
      }
    } else {
      throw new Error(
        `Invalid Option: to_line must be an integer, got ${JSON.stringify(opts.to_line)}`,
      );
    }
  }
  return options;
};

const isRecordEmpty = function (record) {
  return record.every(
    (field) =>
      field == null || (field.toString && field.toString().trim() === ""),
  );
};

const cr = 13; // `\r`, carriage return, 0x0D in hexadécimal, 13 in decimal
const nl = 10; // `\n`, newline, 0x0A in hexadecimal, 10 in decimal

const boms = {
  // Note, the following are equals:
  // Buffer.from("\ufeff")
  // Buffer.from([239, 187, 191])
  // Buffer.from('EFBBBF', 'hex')
  utf8: Buffer.from([239, 187, 191]),
  // Note, the following are equals:
  // Buffer.from "\ufeff", 'utf16le
  // Buffer.from([255, 254])
  utf16le: Buffer.from([255, 254]),
};

const transform = function (original_options = {}) {
  const info = {
    bytes: 0,
    comment_lines: 0,
    empty_lines: 0,
    invalid_field_length: 0,
    lines: 1,
    records: 0,
  };
  const options = normalize_options(original_options);
  return {
    info: info,
    original_options: original_options,
    options: options,
    state: init_state(options),
    __needMoreData: function (i, bufLen, end) {
      if (end) return false;
      const { encoding, escape, quote } = this.options;
      const { quoting, needMoreDataSize, recordDelimiterMaxLength } =
        this.state;
      const numOfCharLeft = bufLen - i - 1;
      const requiredLength = Math.max(
        needMoreDataSize,
        // Skip if the remaining buffer smaller than record delimiter
        // If "record_delimiter" is yet to be discovered:
        // 1. It is equals to `[]` and "recordDelimiterMaxLength" equals `0`
        // 2. We set the length to windows line ending in the current encoding
        // Note, that encoding is known from user or bom discovery at that point
        // recordDelimiterMaxLength,
        recordDelimiterMaxLength === 0
          ? Buffer.from("\r\n", encoding).length
          : recordDelimiterMaxLength,
        // Skip if remaining buffer can be an escaped quote
        quoting ? (escape === null ? 0 : escape.length) + quote.length : 0,
        // Skip if remaining buffer can be record delimiter following the closing quote
        quoting ? quote.length + recordDelimiterMaxLength : 0,
      );
      return numOfCharLeft < requiredLength;
    },
    // Central parser implementation
    parse: function (nextBuf, end, push, close) {
      const {
        bom,
        comment_no_infix,
        encoding,
        from_line,
        ltrim,
        max_record_size,
        raw,
        relax_quotes,
        rtrim,
        skip_empty_lines,
        to,
        to_line,
      } = this.options;
      let { comment, escape, quote, record_delimiter } = this.options;
      const { bomSkipped, previousBuf, rawBuffer, escapeIsQuote } = this.state;
      let buf;
      if (previousBuf === undefined) {
        if (nextBuf === undefined) {
          // Handle empty string
          close();
          return;
        } else {
          buf = nextBuf;
        }
      } else if (previousBuf !== undefined && nextBuf === undefined) {
        buf = previousBuf;
      } else {
        buf = Buffer.concat([previousBuf, nextBuf]);
      }
      // Handle UTF BOM
      if (bomSkipped === false) {
        if (bom === false) {
          this.state.bomSkipped = true;
        } else if (buf.length < 3) {
          // No enough data
          if (end === false) {
            // Wait for more data
            this.state.previousBuf = buf;
            return;
          }
        } else {
          for (const encoding in boms) {
            if (boms[encoding].compare(buf, 0, boms[encoding].length) === 0) {
              // Skip BOM
              const bomLength = boms[encoding].length;
              this.state.bufBytesStart += bomLength;
              buf = buf.slice(bomLength);
              // Renormalize original options with the new encoding
              this.options = normalize_options({
                ...this.original_options,
                encoding: encoding,
              });
              // Options will re-evaluate the Buffer with the new encoding
              ({ comment, escape, quote } = this.options);
              break;
            }
          }
          this.state.bomSkipped = true;
        }
      }
      const bufLen = buf.length;
      let pos;
      for (pos = 0; pos < bufLen; pos++) {
        // Ensure we get enough space to look ahead
        // There should be a way to move this out of the loop
        if (this.__needMoreData(pos, bufLen, end)) {
          break;
        }
        if (this.state.wasRowDelimiter === true) {
          this.info.lines++;
          this.state.wasRowDelimiter = false;
        }
        if (to_line !== -1 && this.info.lines > to_line) {
          this.state.stop = true;
          close();
          return;
        }
        // Auto discovery of record_delimiter, unix, mac and windows supported
        if (this.state.quoting === false && record_delimiter.length === 0) {
          const record_delimiterCount = this.__autoDiscoverRecordDelimiter(
            buf,
            pos,
          );
          if (record_delimiterCount) {
            record_delimiter = this.options.record_delimiter;
          }
        }
        const chr = buf[pos];
        if (raw === true) {
          rawBuffer.append(chr);
        }
        if (
          (chr === cr || chr === nl) &&
          this.state.wasRowDelimiter === false
        ) {
          this.state.wasRowDelimiter = true;
        }
        // Previous char was a valid escape char
        // treat the current char as a regular char
        if (this.state.escaping === true) {
          this.state.escaping = false;
        } else {
          // Escape is only active inside quoted fields
          // We are quoting, the char is an escape chr and there is a chr to escape
          // if(escape !== null && this.state.quoting === true && chr === escape && pos + 1 < bufLen){
          if (
            escape !== null &&
            this.state.quoting === true &&
            this.__isEscape(buf, pos, chr) &&
            pos + escape.length < bufLen
          ) {
            if (escapeIsQuote) {
              if (this.__isQuote(buf, pos + escape.length)) {
                this.state.escaping = true;
                pos += escape.length - 1;
                continue;
              }
            } else {
              this.state.escaping = true;
              pos += escape.length - 1;
              continue;
            }
          }
          // Not currently escaping and chr is a quote
          // TODO: need to compare bytes instead of single char
          if (this.state.commenting === false && this.__isQuote(buf, pos)) {
            if (this.state.quoting === true) {
              const nextChr = buf[pos + quote.length];
              const isNextChrTrimable =
                rtrim && this.__isCharTrimable(buf, pos + quote.length);
              const isNextChrComment =
                comment !== null &&
                this.__compareBytes(comment, buf, pos + quote.length, nextChr);
              const isNextChrDelimiter = this.__isDelimiter(
                buf,
                pos + quote.length,
                nextChr,
              );
              const isNextChrRecordDelimiter =
                record_delimiter.length === 0
                  ? this.__autoDiscoverRecordDelimiter(buf, pos + quote.length)
                  : this.__isRecordDelimiter(nextChr, buf, pos + quote.length);
              // Escape a quote
              // Treat next char as a regular character
              if (
                escape !== null &&
                this.__isEscape(buf, pos, chr) &&
                this.__isQuote(buf, pos + escape.length)
              ) {
                pos += escape.length - 1;
              } else if (
                !nextChr ||
                isNextChrDelimiter ||
                isNextChrRecordDelimiter ||
                isNextChrComment ||
                isNextChrTrimable
              ) {
                this.state.quoting = false;
                this.state.wasQuoting = true;
                pos += quote.length - 1;
                continue;
              } else if (relax_quotes === false) {
                const err = this.__error(
                  new CsvError(
                    "CSV_INVALID_CLOSING_QUOTE",
                    [
                      "Invalid Closing Quote:",
                      `got "${String.fromCharCode(nextChr)}"`,
                      `at line ${this.info.lines}`,
                      "instead of delimiter, record delimiter, trimable character",
                      "(if activated) or comment",
                    ],
                    this.options,
                    this.__infoField(),
                  ),
                );
                if (err !== undefined) return err;
              } else {
                this.state.quoting = false;
                this.state.wasQuoting = true;
                this.state.field.prepend(quote);
                pos += quote.length - 1;
              }
            } else {
              if (this.state.field.length !== 0) {
                // In relax_quotes mode, treat opening quote preceded by chrs as regular
                if (relax_quotes === false) {
                  const info = this.__infoField();
                  const bom = Object.keys(boms)
                    .map((b) =>
                      boms[b].equals(this.state.field.toString()) ? b : false,
                    )
                    .filter(Boolean)[0];
                  const err = this.__error(
                    new CsvError(
                      "INVALID_OPENING_QUOTE",
                      [
                        "Invalid Opening Quote:",
                        `a quote is found on field ${JSON.stringify(info.column)} at line ${info.lines}, value is ${JSON.stringify(this.state.field.toString(encoding))}`,
                        bom ? `(${bom} bom)` : undefined,
                      ],
                      this.options,
                      info,
                      {
                        field: this.state.field,
                      },
                    ),
                  );
                  if (err !== undefined) return err;
                }
              } else {
                this.state.quoting = true;
                pos += quote.length - 1;
                continue;
              }
            }
          }
          if (this.state.quoting === false) {
            const recordDelimiterLength = this.__isRecordDelimiter(
              chr,
              buf,
              pos,
            );
            if (recordDelimiterLength !== 0) {
              // Do not emit comments which take a full line
              const skipCommentLine =
                this.state.commenting &&
                this.state.wasQuoting === false &&
                this.state.record.length === 0 &&
                this.state.field.length === 0;
              if (skipCommentLine) {
                this.info.comment_lines++;
                // Skip full comment line
              } else {
                // Activate records emition if above from_line
                if (
                  this.state.enabled === false &&
                  this.info.lines +
                    (this.state.wasRowDelimiter === true ? 1 : 0) >=
                    from_line
                ) {
                  this.state.enabled = true;
                  this.__resetField();
                  this.__resetRecord();
                  pos += recordDelimiterLength - 1;
                  continue;
                }
                // Skip if line is empty and skip_empty_lines activated
                if (
                  skip_empty_lines === true &&
                  this.state.wasQuoting === false &&
                  this.state.record.length === 0 &&
                  this.state.field.length === 0
                ) {
                  this.info.empty_lines++;
                  pos += recordDelimiterLength - 1;
                  continue;
                }
                this.info.bytes = this.state.bufBytesStart + pos;
                const errField = this.__onField();
                if (errField !== undefined) return errField;
                this.info.bytes =
                  this.state.bufBytesStart + pos + recordDelimiterLength;
                const errRecord = this.__onRecord(push);
                if (errRecord !== undefined) return errRecord;
                if (to !== -1 && this.info.records >= to) {
                  this.state.stop = true;
                  close();
                  return;
                }
              }
              this.state.commenting = false;
              pos += recordDelimiterLength - 1;
              continue;
            }
            if (this.state.commenting) {
              continue;
            }
            if (
              comment !== null &&
              (comment_no_infix === false ||
                (this.state.record.length === 0 &&
                  this.state.field.length === 0))
            ) {
              const commentCount = this.__compareBytes(comment, buf, pos, chr);
              if (commentCount !== 0) {
                this.state.commenting = true;
                continue;
              }
            }
            const delimiterLength = this.__isDelimiter(buf, pos, chr);
            if (delimiterLength !== 0) {
              this.info.bytes = this.state.bufBytesStart + pos;
              const errField = this.__onField();
              if (errField !== undefined) return errField;
              pos += delimiterLength - 1;
              continue;
            }
          }
        }
        if (this.state.commenting === false) {
          if (
            max_record_size !== 0 &&
            this.state.record_length + this.state.field.length > max_record_size
          ) {
            return this.__error(
              new CsvError(
                "CSV_MAX_RECORD_SIZE",
                [
                  "Max Record Size:",
                  "record exceed the maximum number of tolerated bytes",
                  `of ${max_record_size}`,
                  `at line ${this.info.lines}`,
                ],
                this.options,
                this.__infoField(),
              ),
            );
          }
        }
        const lappend =
          ltrim === false ||
          this.state.quoting === true ||
          this.state.field.length !== 0 ||
          !this.__isCharTrimable(buf, pos);
        // rtrim in non quoting is handle in __onField
        const rappend = rtrim === false || this.state.wasQuoting === false;
        if (lappend === true && rappend === true) {
          this.state.field.append(chr);
        } else if (rtrim === true && !this.__isCharTrimable(buf, pos)) {
          return this.__error(
            new CsvError(
              "CSV_NON_TRIMABLE_CHAR_AFTER_CLOSING_QUOTE",
              [
                "Invalid Closing Quote:",
                "found non trimable byte after quote",
                `at line ${this.info.lines}`,
              ],
              this.options,
              this.__infoField(),
            ),
          );
        } else {
          if (lappend === false) {
            pos += this.__isCharTrimable(buf, pos) - 1;
          }
          continue;
        }
      }
      if (end === true) {
        // Ensure we are not ending in a quoting state
        if (this.state.quoting === true) {
          const err = this.__error(
            new CsvError(
              "CSV_QUOTE_NOT_CLOSED",
              [
                "Quote Not Closed:",
                `the parsing is finished with an opening quote at line ${this.info.lines}`,
              ],
              this.options,
              this.__infoField(),
            ),
          );
          if (err !== undefined) return err;
        } else {
          // Skip last line if it has no characters
          if (
            this.state.wasQuoting === true ||
            this.state.record.length !== 0 ||
            this.state.field.length !== 0
          ) {
            this.info.bytes = this.state.bufBytesStart + pos;
            const errField = this.__onField();
            if (errField !== undefined) return errField;
            const errRecord = this.__onRecord(push);
            if (errRecord !== undefined) return errRecord;
          } else if (this.state.wasRowDelimiter === true) {
            this.info.empty_lines++;
          } else if (this.state.commenting === true) {
            this.info.comment_lines++;
          }
        }
      } else {
        this.state.bufBytesStart += pos;
        this.state.previousBuf = buf.slice(pos);
      }
      if (this.state.wasRowDelimiter === true) {
        this.info.lines++;
        this.state.wasRowDelimiter = false;
      }
    },
    __onRecord: function (push) {
      const {
        columns,
        group_columns_by_name,
        encoding,
        info,
        from,
        relax_column_count,
        relax_column_count_less,
        relax_column_count_more,
        raw,
        skip_records_with_empty_values,
      } = this.options;
      const { enabled, record } = this.state;
      if (enabled === false) {
        return this.__resetRecord();
      }
      // Convert the first line into column names
      const recordLength = record.length;
      if (columns === true) {
        if (skip_records_with_empty_values === true && isRecordEmpty(record)) {
          this.__resetRecord();
          return;
        }
        return this.__firstLineToColumns(record);
      }
      if (columns === false && this.info.records === 0) {
        this.state.expectedRecordLength = recordLength;
      }
      if (recordLength !== this.state.expectedRecordLength) {
        const err =
          columns === false
            ? new CsvError(
                "CSV_RECORD_INCONSISTENT_FIELDS_LENGTH",
                [
                  "Invalid Record Length:",
                  `expect ${this.state.expectedRecordLength},`,
                  `got ${recordLength} on line ${this.info.lines}`,
                ],
                this.options,
                this.__infoField(),
                {
                  record: record,
                },
              )
            : new CsvError(
                "CSV_RECORD_INCONSISTENT_COLUMNS",
                [
                  "Invalid Record Length:",
                  `columns length is ${columns.length},`, // rename columns
                  `got ${recordLength} on line ${this.info.lines}`,
                ],
                this.options,
                this.__infoField(),
                {
                  record: record,
                },
              );
        if (
          relax_column_count === true ||
          (relax_column_count_less === true &&
            recordLength < this.state.expectedRecordLength) ||
          (relax_column_count_more === true &&
            recordLength > this.state.expectedRecordLength)
        ) {
          this.info.invalid_field_length++;
          this.state.error = err;
          // Error is undefined with skip_records_with_error
        } else {
          const finalErr = this.__error(err);
          if (finalErr) return finalErr;
        }
      }
      if (skip_records_with_empty_values === true && isRecordEmpty(record)) {
        this.__resetRecord();
        return;
      }
      if (this.state.recordHasError === true) {
        this.__resetRecord();
        this.state.recordHasError = false;
        return;
      }
      this.info.records++;
      if (from === 1 || this.info.records >= from) {
        const { objname } = this.options;
        // With columns, records are object
        if (columns !== false) {
          const obj = {};
          // Transform record array to an object
          for (let i = 0, l = record.length; i < l; i++) {
            if (columns[i] === undefined || columns[i].disabled) continue;
            // Turn duplicate columns into an array
            if (
              group_columns_by_name === true &&
              obj[columns[i].name] !== undefined
            ) {
              if (Array.isArray(obj[columns[i].name])) {
                obj[columns[i].name] = obj[columns[i].name].concat(record[i]);
              } else {
                obj[columns[i].name] = [obj[columns[i].name], record[i]];
              }
            } else {
              obj[columns[i].name] = record[i];
            }
          }
          // Without objname (default)
          if (raw === true || info === true) {
            const extRecord = Object.assign(
              { record: obj },
              raw === true
                ? { raw: this.state.rawBuffer.toString(encoding) }
                : {},
              info === true ? { info: this.__infoRecord() } : {},
            );
            const err = this.__push(
              objname === undefined ? extRecord : [obj[objname], extRecord],
              push,
            );
            if (err) {
              return err;
            }
          } else {
            const err = this.__push(
              objname === undefined ? obj : [obj[objname], obj],
              push,
            );
            if (err) {
              return err;
            }
          }
          // Without columns, records are array
        } else {
          if (raw === true || info === true) {
            const extRecord = Object.assign(
              { record: record },
              raw === true
                ? { raw: this.state.rawBuffer.toString(encoding) }
                : {},
              info === true ? { info: this.__infoRecord() } : {},
            );
            const err = this.__push(
              objname === undefined ? extRecord : [record[objname], extRecord],
              push,
            );
            if (err) {
              return err;
            }
          } else {
            const err = this.__push(
              objname === undefined ? record : [record[objname], record],
              push,
            );
            if (err) {
              return err;
            }
          }
        }
      }
      this.__resetRecord();
    },
    __firstLineToColumns: function (record) {
      const { firstLineToHeaders } = this.state;
      try {
        const headers =
          firstLineToHeaders === undefined
            ? record
            : firstLineToHeaders.call(null, record);
        if (!Array.isArray(headers)) {
          return this.__error(
            new CsvError(
              "CSV_INVALID_COLUMN_MAPPING",
              [
                "Invalid Column Mapping:",
                "expect an array from column function,",
                `got ${JSON.stringify(headers)}`,
              ],
              this.options,
              this.__infoField(),
              {
                headers: headers,
              },
            ),
          );
        }
        const normalizedHeaders = normalize_columns_array(headers);
        this.state.expectedRecordLength = normalizedHeaders.length;
        this.options.columns = normalizedHeaders;
        this.__resetRecord();
        return;
      } catch (err) {
        return err;
      }
    },
    __resetRecord: function () {
      if (this.options.raw === true) {
        this.state.rawBuffer.reset();
      }
      this.state.error = undefined;
      this.state.record = [];
      this.state.record_length = 0;
    },
    __onField: function () {
      const { cast, encoding, rtrim, max_record_size } = this.options;
      const { enabled, wasQuoting } = this.state;
      // Short circuit for the from_line options
      if (enabled === false) {
        return this.__resetField();
      }
      let field = this.state.field.toString(encoding);
      if (rtrim === true && wasQuoting === false) {
        field = field.trimRight();
      }
      if (cast === true) {
        const [err, f] = this.__cast(field);
        if (err !== undefined) return err;
        field = f;
      }
      this.state.record.push(field);
      // Increment record length if record size must not exceed a limit
      if (max_record_size !== 0 && typeof field === "string") {
        this.state.record_length += field.length;
      }
      this.__resetField();
    },
    __resetField: function () {
      this.state.field.reset();
      this.state.wasQuoting = false;
    },
    __push: function (record, push) {
      const { on_record } = this.options;
      if (on_record !== undefined) {
        const info = this.__infoRecord();
        try {
          record = on_record.call(null, record, info);
        } catch (err) {
          return err;
        }
        if (record === undefined || record === null) {
          return;
        }
      }
      push(record);
    },
    // Return a tuple with the error and the casted value
    __cast: function (field) {
      const { columns, relax_column_count } = this.options;
      const isColumns = Array.isArray(columns);
      // Dont loose time calling cast
      // because the final record is an object
      // and this field can't be associated to a key present in columns
      if (
        isColumns === true &&
        relax_column_count &&
        this.options.columns.length <= this.state.record.length
      ) {
        return [undefined, undefined];
      }
      if (this.state.castField !== null) {
        try {
          const info = this.__infoField();
          return [undefined, this.state.castField.call(null, field, info)];
        } catch (err) {
          return [err];
        }
      }
      if (this.__isFloat(field)) {
        return [undefined, parseFloat(field)];
      } else if (this.options.cast_date !== false) {
        const info = this.__infoField();
        return [undefined, this.options.cast_date.call(null, field, info)];
      }
      return [undefined, field];
    },
    // Helper to test if a character is a space or a line delimiter
    __isCharTrimable: function (buf, pos) {
      const isTrim = (buf, pos) => {
        const { timchars } = this.state;
        loop1: for (let i = 0; i < timchars.length; i++) {
          const timchar = timchars[i];
          for (let j = 0; j < timchar.length; j++) {
            if (timchar[j] !== buf[pos + j]) continue loop1;
          }
          return timchar.length;
        }
        return 0;
      };
      return isTrim(buf, pos);
    },
    // Keep it in case we implement the `cast_int` option
    // __isInt(value){
    //   // return Number.isInteger(parseInt(value))
    //   // return !isNaN( parseInt( obj ) );
    //   return /^(\-|\+)?[1-9][0-9]*$/.test(value)
    // }
    __isFloat: function (value) {
      return value - parseFloat(value) + 1 >= 0; // Borrowed from jquery
    },
    __compareBytes: function (sourceBuf, targetBuf, targetPos, firstByte) {
      if (sourceBuf[0] !== firstByte) return 0;
      const sourceLength = sourceBuf.length;
      for (let i = 1; i < sourceLength; i++) {
        if (sourceBuf[i] !== targetBuf[targetPos + i]) return 0;
      }
      return sourceLength;
    },
    __isDelimiter: function (buf, pos, chr) {
      const { delimiter, ignore_last_delimiters } = this.options;
      if (
        ignore_last_delimiters === true &&
        this.state.record.length === this.options.columns.length - 1
      ) {
        return 0;
      } else if (
        ignore_last_delimiters !== false &&
        typeof ignore_last_delimiters === "number" &&
        this.state.record.length === ignore_last_delimiters - 1
      ) {
        return 0;
      }
      loop1: for (let i = 0; i < delimiter.length; i++) {
        const del = delimiter[i];
        if (del[0] === chr) {
          for (let j = 1; j < del.length; j++) {
            if (del[j] !== buf[pos + j]) continue loop1;
          }
          return del.length;
        }
      }
      return 0;
    },
    __isRecordDelimiter: function (chr, buf, pos) {
      const { record_delimiter } = this.options;
      const recordDelimiterLength = record_delimiter.length;
      loop1: for (let i = 0; i < recordDelimiterLength; i++) {
        const rd = record_delimiter[i];
        const rdLength = rd.length;
        if (rd[0] !== chr) {
          continue;
        }
        for (let j = 1; j < rdLength; j++) {
          if (rd[j] !== buf[pos + j]) {
            continue loop1;
          }
        }
        return rd.length;
      }
      return 0;
    },
    __isEscape: function (buf, pos, chr) {
      const { escape } = this.options;
      if (escape === null) return false;
      const l = escape.length;
      if (escape[0] === chr) {
        for (let i = 0; i < l; i++) {
          if (escape[i] !== buf[pos + i]) {
            return false;
          }
        }
        return true;
      }
      return false;
    },
    __isQuote: function (buf, pos) {
      const { quote } = this.options;
      if (quote === null) return false;
      const l = quote.length;
      for (let i = 0; i < l; i++) {
        if (quote[i] !== buf[pos + i]) {
          return false;
        }
      }
      return true;
    },
    __autoDiscoverRecordDelimiter: function (buf, pos) {
      const { encoding } = this.options;
      // Note, we don't need to cache this information in state,
      // It is only called on the first line until we find out a suitable
      // record delimiter.
      const rds = [
        // Important, the windows line ending must be before mac os 9
        Buffer.from("\r\n", encoding),
        Buffer.from("\n", encoding),
        Buffer.from("\r", encoding),
      ];
      loop: for (let i = 0; i < rds.length; i++) {
        const l = rds[i].length;
        for (let j = 0; j < l; j++) {
          if (rds[i][j] !== buf[pos + j]) {
            continue loop;
          }
        }
        this.options.record_delimiter.push(rds[i]);
        this.state.recordDelimiterMaxLength = rds[i].length;
        return rds[i].length;
      }
      return 0;
    },
    __error: function (msg) {
      const { encoding, raw, skip_records_with_error } = this.options;
      const err = typeof msg === "string" ? new Error(msg) : msg;
      if (skip_records_with_error) {
        this.state.recordHasError = true;
        if (this.options.on_skip !== undefined) {
          this.options.on_skip(
            err,
            raw ? this.state.rawBuffer.toString(encoding) : undefined,
          );
        }
        // this.emit('skip', err, raw ? this.state.rawBuffer.toString(encoding) : undefined);
        return undefined;
      } else {
        return err;
      }
    },
    __infoDataSet: function () {
      return {
        ...this.info,
        columns: this.options.columns,
      };
    },
    __infoRecord: function () {
      const { columns, raw, encoding } = this.options;
      return {
        ...this.__infoDataSet(),
        error: this.state.error,
        header: columns === true,
        index: this.state.record.length,
        raw: raw ? this.state.rawBuffer.toString(encoding) : undefined,
      };
    },
    __infoField: function () {
      const { columns } = this.options;
      const isColumns = Array.isArray(columns);
      return {
        ...this.__infoRecord(),
        column:
          isColumns === true
            ? columns.length > this.state.record.length
              ? columns[this.state.record.length].name
              : null
            : this.state.record.length,
        quoting: this.state.wasQuoting,
      };
    },
  };
};

/*
CSV Parse

Please look at the [project documentation](https://csv.js.org/parse/) for
additional information.
*/


class Parser extends stream.Transform {
  constructor(opts = {}) {
    super({ ...{ readableObjectMode: true }, ...opts, encoding: null });
    this.api = transform({
      on_skip: (err, chunk) => {
        this.emit("skip", err, chunk);
      },
      ...opts,
    });
    // Backward compatibility
    this.state = this.api.state;
    this.options = this.api.options;
    this.info = this.api.info;
  }
  // Implementation of `Transform._transform`
  _transform(buf, _, callback) {
    if (this.state.stop === true) {
      return;
    }
    const err = this.api.parse(
      buf,
      false,
      (record) => {
        this.push(record);
      },
      () => {
        this.push(null);
        this.end();
        // Fix #333 and break #410
        //   ko: api.stream.iterator.coffee
        //   ko with v21.4.0, ok with node v20.5.1: api.stream.finished # aborted (with generate())
        //   ko: api.stream.finished # aborted (with Readable)
        // this.destroy()
        // Fix #410 and partially break #333
        //   ok: api.stream.iterator.coffee
        //   ok: api.stream.finished # aborted (with generate())
        //   broken: api.stream.finished # aborted (with Readable)
        this.on("end", this.destroy);
      },
    );
    if (err !== undefined) {
      this.state.stop = true;
    }
    callback(err);
  }
  // Implementation of `Transform._flush`
  _flush(callback) {
    if (this.state.stop === true) {
      return;
    }
    const err = this.api.parse(
      undefined,
      true,
      (record) => {
        this.push(record);
      },
      () => {
        this.push(null);
        this.on("end", this.destroy);
      },
    );
    callback(err);
  }
}

const parse = function () {
  let data, options, callback;
  for (const i in arguments) {
    const argument = arguments[i];
    const type = typeof argument;
    if (
      data === undefined &&
      (typeof argument === "string" || Buffer.isBuffer(argument))
    ) {
      data = argument;
    } else if (options === undefined && is_object(argument)) {
      options = argument;
    } else if (callback === undefined && type === "function") {
      callback = argument;
    } else {
      throw new CsvError(
        "CSV_INVALID_ARGUMENT",
        ["Invalid argument:", `got ${JSON.stringify(argument)} at index ${i}`],
        options || {},
      );
    }
  }
  const parser = new Parser(options);
  if (callback) {
    const records =
      options === undefined || options.objname === undefined ? [] : {};
    parser.on("readable", function () {
      let record;
      while ((record = this.read()) !== null) {
        if (options === undefined || options.objname === undefined) {
          records.push(record);
        } else {
          records[record[0]] = record[1];
        }
      }
    });
    parser.on("error", function (err) {
      callback(err, undefined, parser.api.__infoDataSet());
    });
    parser.on("end", function () {
      callback(undefined, records, parser.api.__infoDataSet());
    });
  }
  if (data !== undefined) {
    const writer = function () {
      parser.write(data);
      parser.end();
    };
    // Support Deno, Rollup doesnt provide a shim for setImmediate
    if (typeof setImmediate === "function") {
      setImmediate(writer);
    } else {
      setTimeout(writer, 0);
    }
  }
  return parser;
};

exports.CsvError = CsvError;
exports.Parser = Parser;
exports.parse = parse;