read-excel-file/modules/xlsx/parseSpreadsheetContents.js

Read `.xlsx` files in a web browser or in Node.js

function _createForOfIteratorHelperLoose(o, allowArrayLike) { var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"]; if (it) return (it = it.call(o)).next.bind(it); if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; return function () { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i]; return arr2; }
import parseSpreadsheetInfo from './parseSpreadsheetInfo.js';
import parseFilePaths from './parseFilePaths.js';
import parseStyles from './parseStyles.js';
import parseSharedStrings from './parseSharedStrings.js';
import parseSheet from './parseSheet.js';

// For an introduction in reading `.xlsx` files see "The minimum viable XLSX reader":
// https://www.brendanlong.com/the-minimum-viable-xlsx-reader.html

/**
 * Reads data from an `.xlsx` file.
 * @param  {Record<string,string>} contents - A map of `.xml` files inside the `.xlsx` file (which itself is just a zipped directory).
 * @param  {object} xml — An object having a single property — `createDocument(string)` function.
 * @param  {object} [options]
 * @return {Sheet[]}
 */
export default function parseSpreadsheetContents(contents, xml) {
  var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
  var getFileContent = function getFileContent(filePath) {
    if (!contents[filePath]) {
      throw new Error("\"".concat(filePath, "\" file not found inside the *.xlsx file zip archive"));
    }
    return contents[filePath];
  };

  // Read the paths to certain files inside the `.xlsx` file, which is itself just a `.zip` archive.
  // These paths aren't standardized between different spreadsheet editors.
  // https://github.com/tidyverse/readxl/issues/104
  var filePaths = parseFilePaths(getFileContent('xl/_rels/workbook.xml.rels'), xml);

  // The usual file path for "shared strings" is "xl/sharedStrings.xml".
  var sharedStrings = filePaths.sharedStrings ? parseSharedStrings(getFileContent(filePaths.sharedStrings), xml) : [];

  // The usual file path for "styles" is "xl/styles.xml".
  var styles = filePaths.styles ? parseStyles(getFileContent(filePaths.styles), xml) : {};
  var _parseSpreadsheetInfo = parseSpreadsheetInfo(getFileContent('xl/workbook.xml'), xml),
    sheets = _parseSpreadsheetInfo.sheets,
    epoch1904 = _parseSpreadsheetInfo.epoch1904;
  var sheetIdsToRead = options.sheets && options.sheets.map(function (sheet) {
    return getSheetId(sheet, sheets);
  });

  // Parse sheets data.

  var sheetsData = [];
  for (var _i = 0, _Object$keys = Object.keys(filePaths.sheets); _i < _Object$keys.length; _i++) {
    var sheetId = _Object$keys[_i];
    if (sheetIdsToRead && !sheetIdsToRead.includes(sheetId)) {
      continue;
    }
    sheetsData.push({
      sheet: getSheetNameById(sheetId, sheets),
      data: parseSheet(getFileContent(filePaths.sheets[sheetId]), xml, sharedStrings, styles, epoch1904, options)
    });
  }

  // Return spreadsheet data.
  return sheetsData;
}
function getSheetId(sheet, sheets) {
  if (typeof sheet === 'string') {
    for (var _iterator = _createForOfIteratorHelperLoose(sheets), _step; !(_step = _iterator()).done;) {
      var _sheet = _step.value;
      if (_sheet.name === sheet) {
        return _sheet.relationId;
      }
    }
    throw new Error("Sheet \"".concat(sheet, "\" not found. Available sheets: ").concat(sheets.map(function (_ref) {
      var name = _ref.name;
      return "\"".concat(name, "\"");
    }).join(', ')));
  } else {
    if (sheet <= sheets.length) {
      return sheets[sheet - 1].relationId;
    }
    throw new Error("Sheet number out of bounds: ".concat(sheet, ". Available sheets count: ").concat(sheets.length));
  }
}
function getSheetNameById(sheetId, sheets) {
  for (var _iterator2 = _createForOfIteratorHelperLoose(sheets), _step2; !(_step2 = _iterator2()).done;) {
    var sheet = _step2.value;
    if (sheet.relationId === sheetId) {
      return sheet.name;
    }
  }
  throw new Error("Sheet ID not found: ".concat(sheetId));
}
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