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romanNumeralExtensions.js
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romanNumeralExtensions.js
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var Humanizer;
(function (Humanizer) {
"use strict";
var romanNumberals = {
"M": 1000,
"CM": 900,
"D": 500,
"CD": 400,
"C": 100,
"XC": 90,
"L": 50,
"XL": 40,
"X": 10,
"IX": 9,
"V": 5,
"IV": 4,
"I": 1
};
var validRomanNumerals = /^(?:(?=[MDCLXVI])((M{0,3})((C[DM])|(D?C{0,3}))?((X[LC])|(L?XX{0,2})|L)?((I[VX])|(V?(II{0,2}))|V)?))$/;
/**
* Converts Roman numbers into integer
* @returns {Number} Human-readable number
*/
String.prototype.fromRoman = function () {
/// <summary>
/// Converts Roman numbers into integer
/// </summary>
/// <returns type="Number" integer="true">
/// Human-readable number
/// </returns>
var input = this.toUpperCase().trim();
var length = input.length;
if ((length === 0) || !validRomanNumerals.test(input)) {
throw new Error("Empty or invalid Roman numeral string.");
}
var total = 0;
var i = length;
while (i > 0) {
var digit = romanNumberals[input.charAt(--i)];
if (i > 0) {
var previousDigit = romanNumberals[input.charAt(i - 1)];
if (previousDigit < digit) {
digit -= previousDigit;
i--;
}
}
total += digit;
}
return total;
};
/**
* Converts the input to Roman number
* @returns {String} Roman number
*/
Number.prototype.toRoman = function () {
/// <summary>
/// Converts the input to Roman number
/// </summary>
/// <returns type="String">
/// Roman number
/// </returns>
var minValue = 1;
var maxValue = 3999;
if ((this < minValue) || (this > maxValue)) {
throw new Error("Out of range");
}
var sb = [];
var input = this;
for (var key in romanNumberals) {
if (Object.prototype.hasOwnProperty.call(romanNumberals, romanNumberals)) {
var value = romanNumberals[key];
while (input / value > 0) {
sb.push(key);
input -= value;
}
}
}
return sb.join("");
};
})(Humanizer || (Humanizer = {}));
//# sourceMappingURL=romanNumeralExtensions.js.map