@technobuddha/library/dist/romanize.js

A large library of useful functions

import { valueGlyphs } from "./roman-numeral.js";
import { splitChars } from "./split-chars.js";
import { empty } from "./unicode.js";
// cspell:ignore MMXXIV
/**
 * Convert a number into a roman numeral string
 * @param input - The number to turn into a roman numeral
 * @param options - see {@link RomanOptions}
 * @returns Converted roman numeral
 * @example
 * ```typescript
 * toRoman(1); // "I"
 * toRoman(4); // "IV"
 * toRoman(9); // "IX"
 * toRoman(2024); // "MMXXIV"
 * toRoman(49, { format: 'apostrophus' }); // "IL"
 * ```
 * @group Math
 * @category Roman Numerals
 */
export function romanize(input, { format = 'standard' } = {}) {
    const vg = valueGlyphs[format];
    if (input < 1 || input > vg.limit || !Number.isInteger(input)) {
        throw new RangeError(`Input must be an integer between 1 and ${vg.limit}`);
    }
    const digits = splitChars(input.toString());
    let roman = empty;
    for (let i = 0; i < vg.glyphs.length && digits.length > 0; ++i) {
        roman = vg.glyphs[i][Number.parseInt(digits.pop())] + roman;
    }
    // return lastGlyph.repeat(Number.parseInt(build(digits))) + roman;
    return roman;
}
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