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105 lines
3.4 KiB
JavaScript
105 lines
3.4 KiB
JavaScript
const number_formats = {
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"#,###.##": { fraction_sep: ".", group_sep: ",", precision: 2 },
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"#.###,##": { fraction_sep: ",", group_sep: ".", precision: 2 },
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"# ###.##": { fraction_sep: ".", group_sep: " ", precision: 2 },
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"# ###,##": { fraction_sep: ",", group_sep: " ", precision: 2 },
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"#'###.##": { fraction_sep: ".", group_sep: "'", precision: 2 },
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"#, ###.##": { fraction_sep: ".", group_sep: ", ", precision: 2 },
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"#,##,###.##": { fraction_sep: ".", group_sep: ",", precision: 2 },
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"#,###.###": { fraction_sep: ".", group_sep: ",", precision: 3 },
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"#.###": { fraction_sep: "", group_sep: ".", precision: 0 },
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"#,###": { fraction_sep: "", group_sep: ",", precision: 0 },
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}
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module.exports = {
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// parse a formatted number string
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// from "4,555,000.34" -> 4555000.34
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parse_number(number, format='#,###.##') {
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if (!number) {
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return 0;
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}
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if (typeof number === 'number') {
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return number;
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}
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const info = this.get_format_info(format);
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return parseFloat(this.remove_separator(number, info.group_sep));
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},
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format_number(number, format = '#,###.##', precision = null) {
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if (!number) {
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number = 0;
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}
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let info = this.get_format_info(format);
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if (precision) {
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info.precision = precision;
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}
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let is_negative = false;
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number = this.parse_number(number);
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if (number < 0) {
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is_negative = true;
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}
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number = Math.abs(number);
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number = number.toFixed(info.precision);
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var parts = number.split('.');
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// get group position and parts
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var group_position = info.group_sep ? 3 : 0;
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if (group_position) {
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var integer = parts[0];
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var str = '';
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var offset = integer.length % group_position;
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for (var i = integer.length; i >= 0; i--) {
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var l = this.remove_separator(str, info.group_sep).length;
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if (format == "#,##,###.##" && str.indexOf(",") != -1) { // INR
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group_position = 2;
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l += 1;
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}
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str += integer.charAt(i);
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if (l && !((l + 1) % group_position) && i != 0) {
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str += info.group_sep;
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}
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}
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parts[0] = str.split("").reverse().join("");
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}
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if (parts[0] + "" == "") {
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parts[0] = "0";
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}
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// join decimal
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parts[1] = (parts[1] && info.fraction_sep) ? (info.fraction_sep + parts[1]) : "";
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// join
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return (is_negative ? "-" : "") + parts[0] + parts[1];
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},
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get_format_info(format) {
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let format_info = number_formats[format];
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if (!format_info) {
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throw `Unknown number format "${format}"`;
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}
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return format_info;
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},
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round(num, precision) {
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var is_negative = num < 0 ? true : false;
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var d = parseInt(precision || 0);
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var m = Math.pow(10, d);
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var n = +(d ? Math.abs(num) * m : Math.abs(num)).toFixed(8); // Avoid rounding errors
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var i = Math.floor(n), f = n - i;
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var r = ((!precision && f == 0.5) ? ((i % 2 == 0) ? i : i + 1) : Math.round(n));
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r = d ? r / m : r;
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return is_negative ? -r : r;
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},
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remove_separator(text, sep) {
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return text.replace(new RegExp(sep === "." ? "\\." : sep, "g"), '');
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}
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};
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