59 lines
1.7 KiB
JavaScript
59 lines
1.7 KiB
JavaScript
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function formatNumber(number, fixed=false, integer=false) {
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if (!(number instanceof Decimal)) number = new Decimal(number);
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let sign = number.sign;
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let result = "";
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if (sign < 0) result += "-";
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let numlog = number.abs().max(1e-100).log10();
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if (numlog.gt(1e9)) {
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result += "e";
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numlog = numlog.log10();
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}
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numlog = numlog.toNumber();
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// Non-exponential
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if (numlog < 6) {
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let extra_digits = 3;
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if (numlog >= 1) extra_digits = 2;
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if (numlog >= 3) extra_digits = 1;
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if (numlog >= 5) extra_digits = 0;
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if (!integer) result += pad_number(Math.pow(10, numlog), extra_digits, fixed);
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else result += prettify_integer(Math.floor(Math.pow(10, numlog) + 1e-6), ',');
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}
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// Exponential
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else {
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if (round_prec(Math.pow(10, numlog - Math.floor(numlog)), 100) == 10) numlog = Math.round(numlog);
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result += pad_number(Math.pow(10, numlog - Math.floor(numlog)), 2, fixed);
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result += "e";
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result += prettify_integer(Math.floor(numlog), ',');
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}
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return result;
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}
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function round_prec(x, prec) {
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return Math.round(x * prec) / prec;
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}
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function pad_number(number, extra_digits, fixed=false) {
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let num = String(round_prec(number, Math.pow(10, extra_digits)));
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if (fixed && extra_digits > 0) {
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if (!num.includes('.')) num += '.';
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for (let rem = extra_digits - num.length + num.indexOf('.') + 1; rem > 0; rem--) num += '0';
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}
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return num;
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}
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function prettify_integer(number, delimiter="'") {
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let num = String(number);
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let result = "";
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for (let i = 0; i < num.length; i++) {
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result += num[i];
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if (i < num.length - 1 && (num.length - i) % 3 == 1) result += delimiter;
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}
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return result;
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}
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