fxparser/lib/helper/cell.js

Formula parser designed for Yotta Needs.

'use strict';

exports.__esModule = true;
exports.rowLabelToIndex = rowLabelToIndex;
exports.rowIndexToLabel = rowIndexToLabel;
exports.columnLabelToIndex = columnLabelToIndex;
exports.columnIndexToLabel = columnIndexToLabel;
exports.extractLabel = extractLabel;
exports.toLabel = toLabel;
/**
 * Convert row label to index.
 *
 * @param {String} label Row label (eq. '1', '5')
 * @returns {Number} Returns -1 if label is not recognized otherwise proper row index.
 */
function rowLabelToIndex(label) {
  var result = parseInt(label, 10);

  if (Number.isNaN(result)) {
    result = -1;
  } else {
    result = Math.max(result - 1, -1);
  }

  return result;
}

/**
 * Convert row index to label.
 *
 * @param {Number} row Row index.
 * @returns {String} Returns row label (eq. '1', '7').
 */
function rowIndexToLabel(row) {
  var result = '';

  if (row >= 0) {
    result = '' + (row + 1);
  }

  return result;
}

var COLUMN_LABEL_BASE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
var COLUMN_LABEL_BASE_LENGTH = COLUMN_LABEL_BASE.length;

/**
 * Convert column label to index.
 *
 * @param {String} label Column label (eq. 'ABB', 'CNQ')
 * @returns {Number} Returns -1 if label is not recognized otherwise proper column index.
 */
function columnLabelToIndex(label) {
  var result = 0;

  if (typeof label === 'string') {
    label = label.toUpperCase();

    for (var i = 0, j = label.length - 1; i < label.length; i += 1, j -= 1) {
      result += Math.pow(COLUMN_LABEL_BASE_LENGTH, j) * (COLUMN_LABEL_BASE.indexOf(label[i]) + 1);
    }
  }
  --result;

  return result;
}

/**
 * Convert column index to label.
 *
 * @param {Number} column Column index.
 * @returns {String} Returns column label (eq. 'ABB', 'CNQ').
 */
function columnIndexToLabel(column) {
  var result = '';

  while (column >= 0) {
    result = String.fromCharCode(column % COLUMN_LABEL_BASE_LENGTH + 97) + result;
    column = Math.floor(column / COLUMN_LABEL_BASE_LENGTH) - 1;
  }

  return result.toUpperCase();
}

var LABEL_EXTRACT_REGEXP = /^([$])?([A-Za-z]+)([$])?([0-9]+)$/;

/**
 * Extract cell coordinates.
 *
 * @param {String} label Cell coordinates (eq. 'A1', '$B6', '$N$98').
 * @returns {Array} Returns an array of objects.
 */
function extractLabel(label) {
  if (typeof label !== 'string' || !LABEL_EXTRACT_REGEXP.test(label)) {
    return [];
  }

  var _label$toUpperCase$ma = label.toUpperCase().match(LABEL_EXTRACT_REGEXP),
      columnAbs = _label$toUpperCase$ma[1],
      column = _label$toUpperCase$ma[2],
      rowAbs = _label$toUpperCase$ma[3],
      row = _label$toUpperCase$ma[4];

  return [{
    index: rowLabelToIndex(row),
    label: row,
    isAbsolute: rowAbs === '$'
  }, {
    index: columnLabelToIndex(column),
    label: column,
    isAbsolute: columnAbs === '$'
  }];
}

/**
 * Convert row and column indexes into cell label.
 *
 * @param {Object} row Object with `index` and `isAbsolute` properties.
 * @param {Object} column Object with `index` and `isAbsolute` properties.
 * @returns {String} Returns cell label.
 */
function toLabel(row, column) {
  var rowLabel = (row.isAbsolute ? '$' : '') + rowIndexToLabel(row.index);
  var columnLabel = (column.isAbsolute ? '$' : '') + columnIndexToLabel(column.index);

  return columnLabel + rowLabel;
}