59 lines
No EOL
1.7 KiB
JavaScript
59 lines
No EOL
1.7 KiB
JavaScript
function formatNumber(number, fixed=false, integer=false) {
|
|
if (!(number instanceof Decimal)) number = new Decimal(number);
|
|
|
|
let sign = number.sign;
|
|
|
|
let result = "";
|
|
if (sign < 0) result += "-";
|
|
|
|
let numlog = number.abs().max(1e-100).log10();
|
|
if (numlog.gt(1e9)) {
|
|
result += "e";
|
|
numlog = numlog.log10();
|
|
}
|
|
numlog = numlog.toNumber();
|
|
|
|
// Non-exponential
|
|
if (numlog < 6) {
|
|
let extra_digits = 3;
|
|
if (numlog >= 1) extra_digits = 2;
|
|
if (numlog >= 3) extra_digits = 1;
|
|
if (numlog >= 5) extra_digits = 0;
|
|
|
|
if (!integer) result += pad_number(Math.pow(10, numlog), extra_digits, fixed);
|
|
else result += prettify_integer(Math.floor(Math.pow(10, numlog) + 1e-6), ',');
|
|
}
|
|
// Exponential
|
|
else {
|
|
if (round_prec(Math.pow(10, numlog - Math.floor(numlog)), 100) == 10) numlog = Math.round(numlog);
|
|
|
|
result += pad_number(Math.pow(10, numlog - Math.floor(numlog)), 2, fixed);
|
|
result += "e";
|
|
result += prettify_integer(Math.floor(numlog), ',');
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
function round_prec(x, prec) {
|
|
return Math.round(x * prec) / prec;
|
|
}
|
|
|
|
function pad_number(number, extra_digits, fixed=false) {
|
|
let num = String(round_prec(number, Math.pow(10, extra_digits)));
|
|
if (fixed && extra_digits > 0) {
|
|
if (!num.includes('.')) num += '.';
|
|
for (let rem = extra_digits - num.length + num.indexOf('.') + 1; rem > 0; rem--) num += '0';
|
|
}
|
|
return num;
|
|
}
|
|
|
|
function prettify_integer(number, delimiter="'") {
|
|
let num = String(number);
|
|
let result = "";
|
|
for (let i = 0; i < num.length; i++) {
|
|
result += num[i];
|
|
if (i < num.length - 1 && (num.length - i) % 3 == 1) result += delimiter;
|
|
}
|
|
return result;
|
|
} |