52 lines
1.5 KiB
TypeScript
52 lines
1.5 KiB
TypeScript
export const formatNumber = (input: string, format: string): string => {
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if (!input) {
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return "";
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}
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// array holding the patterns for the number of expected digits in each part
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const digitPattern = format.match(/{\d+}/g);
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if (!digitPattern) {
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return "";
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}
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// calculate the maximum size of the given pattern based on the sum of the expected digits
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const maxSize = digitPattern.reduce(
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(total, p) => total + parseInt(p.replace("{", "").replace("}", "")),
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0
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);
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// keep only digits
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let rawValue = input.replace(/\D+/g, "");
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// make sure the value is a number
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if (`${parseInt(rawValue)}` !== rawValue) {
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return "";
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}
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// make sure the number of digits does not exceed the maximum size
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if (rawValue.length > maxSize) {
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rawValue = rawValue.substring(0, maxSize);
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}
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// build the regex based based on the expected digits in each part
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const formatter = digitPattern.reduce((result, p) => result + `(\\d${p})`, "^");
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// if the current digits match the pattern we have each group of digits in an array
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let digits = new RegExp(formatter).exec(rawValue);
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// no match, return the raw value without any format
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if (!digits) {
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return input;
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}
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let result = format;
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// finally format the current digits accordingly to the given format
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for (let i = 0; i < digitPattern.length; i++) {
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result = result.replace(digitPattern[i], digits[i + 1]);
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}
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return result;
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};
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