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books/utils/numberFormat.js
2018-07-14 21:42:34 +05:30

105 lines
3.0 KiB
JavaScript

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