/**
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* Java Formatter class polyfill that works in the JS way.
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*/
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export default class Formatter {
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constructor() {
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this.buffer = '';
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}
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/**
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*
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* @see https://stackoverflow.com/a/13439711/4367683
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*
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* @param str
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* @param arr
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*/
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static form(str, arr) {
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let i = -1;
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function callback(exp, p0, p1, p2, p3, p4) {
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if (exp === '%%')
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return '%';
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if (arr[++i] === undefined)
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return undefined;
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exp = p2 ? parseInt(p2.substr(1)) : undefined;
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let base = p3 ? parseInt(p3.substr(1)) : undefined;
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let val;
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switch (p4) {
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case 's':
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val = arr[i];
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break;
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case 'c':
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val = arr[i][0];
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break;
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case 'f':
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val = parseFloat(arr[i]).toFixed(exp);
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break;
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case 'p':
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val = parseFloat(arr[i]).toPrecision(exp);
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break;
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case 'e':
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val = parseFloat(arr[i]).toExponential(exp);
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break;
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case 'x':
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val = parseInt(arr[i]).toString(base ? base : 16);
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break;
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case 'd':
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val = parseFloat(parseInt(arr[i], base ? base : 10).toPrecision(exp)).toFixed(0);
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break;
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}
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val = typeof val === 'object' ? JSON.stringify(val) : (+val).toString(base);
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let size = parseInt(p1); /* padding size */
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let ch = p1 && (p1[0] + '') === '0' ? '0' : ' '; /* isnull? */
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while (val.length < size)
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val = p0 !== undefined ? val + ch : ch + val; /* isminus? */
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return val;
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}
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let regex = /%(-)?(0?[0-9]+)?([.][0-9]+)?([#][0-9]+)?([scfpexd%])/g;
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return str.replace(regex, callback);
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}
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/**
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*
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* @param append The new string to append.
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* @param args Argumets values to be formated.
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*/
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format(append, ...args) {
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this.buffer += Formatter.form(append, args);
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}
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/**
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* Returns the Formatter string value.
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*/
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toString() {
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return this.buffer;
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}
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}
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