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| /*
* Copyright (c) AXA Shared Services Spain S.A.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
class XTableUtils {
/**
* Indicates the index of a given alpha character.
* @param {Character} c Character to be checked.
* @returns Index of the character, -1 if is invalid.
*/
static alphaIndex(c) {
return XTableUtils.alphachars.indexOf(c);
}
/**
* Indicates if the given character is a valid Alpha.
* @param {Character} c Character to be checked.
* @returns {Boolean} True if the character is a valid alpha, false otherwise.
*/
static isAlphaChar(c) {
return XTableUtils.alphaIndex(c) !== -1;
}
/**
* Converts an alpha from excel to its number equivalent.
* @param {String} alpha Alpha representation, example: 'AB'. Is the format
* for naming columns in Excel.
* @returns {Number} Alpha in number format.
*/
static alpha2number(alpha) {
let result = 0;
const alphalength = XTableUtils.alphachars.length;
for (let i = 0, l = alpha.length; i < l; i += 1) {
if (i > 0) {
result += 1;
}
const current = XTableUtils.alphaIndex(alpha[i]);
if (current === -1) {
throw new Error('Invalid alpha');
}
result = result * alphalength + current;
}
return result;
}
/**
* Given a decimal number, transform it to alpha format.
* @param {Number} n Number in decimal format.
* @return {String} Number in alpha format.
*/
static number2alpha(n) {
if (!Number.isInteger(n)) {
throw new Error('Invalid number');
}
if (n < 0) {
throw new Error('Number cannot be negative');
}
const alphalength = XTableUtils.alphachars.length;
if (n < alphalength) {
return XTableUtils.alphachars[n];
}
let result = '';
let x = n;
while (x >= 0) {
const currentMod = x % alphalength;
const currentValue = XTableUtils.alphachars[currentMod];
result = currentValue + result;
x = (x - currentMod) / alphalength - 1;
}
return result;
}
/**
* Given an excel coordinate (example: 'BC123') transform it
* to decimal coordinates.
* @param {String} str Excel coordinate.
* @returns {Object} Coordinate in format { column: ..., row: ...}
*/
static excel2coord(str) {
const l = str.length;
let index = 0;
let alpha = '';
let numeric = '';
while (index < l && XTableUtils.isAlphaChar(str[index])) {
alpha += str[index];
index += 1;
}
while (index < l) {
numeric += str[index];
index += 1;
}
return {
column: XTableUtils.alpha2number(alpha),
row: Number.parseInt(numeric, 10) - 1,
};
}
/**
* Decimal coordinate to excel coordinate.
* @param {Object} coord Decimal coordinate in format { column: ..., row: ...}
* @returns {String} Excel coordinate.
*/
static coord2excel(coord) {
return XTableUtils.number2alpha(coord.column) + (coord.row + 1);
}
/**
* Transform an excel range to a decimal range.
* @param {*} str
*/
static excel2range(str) {
const index = str.indexOf(':');
if (index === -1) {
throw new Error('Invalid excel range');
}
return {
topleft: XTableUtils.excel2coord(str.substring(0, index)),
bottomright: XTableUtils.excel2coord(
str.substring(index + 1, str.length)
),
};
}
}
XTableUtils.alphachars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
module.exports = XTableUtils;
|