jtc-utils/mjs/lib/formatNumber.mjs

Utilities for Japanese Traditional Companies

import { enUS, ja } from "./locale/index.mjs";
import { parseNumber } from "./parseNumber.mjs";
import { NumberFormat } from "./util/NumberFormat.mjs";
import { getLocale } from "./util/getLocale.mjs";
export function formatNumber(num, format, options) {
    let value;
    if (num == null) {
        return "";
    }
    else if (typeof num === "string") {
        const tmp = parseNumber(num);
        if (!tmp) {
            return num;
        }
        value = tmp;
    }
    else {
        value = num;
    }
    if (!format || !Number.isFinite(value)) {
        return toPlainString(value);
    }
    const locale = options?.locale ?? (/^ja(-|$)/i.test(getLocale()) ? ja : enUS);
    return NumberFormat.get(format, locale.code).format(value);
}
function toPlainString(num) {
    if (typeof num === "number" && (!Number.isFinite(num) || num === 0)) {
        return num.toString();
    }
    let str = num.toString();
    const sep = str.indexOf("e");
    if (sep === -1) {
        return str;
    }
    let minus = "";
    if (str.startsWith("-")) {
        str = str.substring(1);
        minus = "-";
    }
    const esign = str.charAt(sep + 1);
    const e = Number.parseInt(str.substring(sep + 2), 10);
    str = str.substring(0, sep);
    const index = str.indexOf(".");
    let scale = index === -1 ? 0 : str.length - index - 1;
    str = index === -1 ? str : str.substring(0, index) + str.substring(index + 1);
    if (esign === "+") {
        str = str + "0".repeat(e);
    }
    else {
        scale = scale + e;
    }
    str = str.replace(/^0+/, "");
    if (scale === 0) {
        return minus + str;
    }
    const ipart = str.length > scale ? minus + str.substring(0, str.length - scale) : "0";
    const fpart = (str.length > scale
        ? str.substring(str.length - scale)
        : "0".repeat(scale - str.length) + str).replace(/0+$/, "");
    return ipart + (fpart ? `.${fpart}` : "");
}