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94 lines
2.3 KiB
JavaScript
94 lines
2.3 KiB
JavaScript
"use strict";
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/* TODO:
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toDisplay
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conversion between unit scales (eg. IEC -> metric bytes)
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*/
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const util = require("util");
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const chalk = require("chalk");
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function capitalize(string) {
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return string[0].toUpperCase() + string.slice(1);
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}
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module.exports = function makeUnits(unitSpecs) {
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let resultObject = {};
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unitSpecs.forEach((spec, i) => {
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let proto = {
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[util.inspect.custom]: function (_depth, options) {
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let inspectString = `<Unit> ${this.amount} ${this.unit}`;
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if (options.colors === true) {
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return chalk.cyan(inspectString);
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} else {
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return inspectString;
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}
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},
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toString: function () {
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return `${this.amount} ${this.unit}`;
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},
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toDisplay: function (decimals) {
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let roundingFactor = Math.pow(10, decimals);
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let unitMagnitude = i;
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let amount = this.amount;
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let unitsLeft = (i < unitSpecs.length - 1);
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function createOfCurrentMagnitude() {
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let roundedValue = Math.round(amount * roundingFactor) / roundingFactor;
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return resultObject[unitSpecs[unitMagnitude].unit](roundedValue);
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}
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while (unitsLeft === true) {
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let currentUnit = unitSpecs[unitMagnitude];
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if (amount < currentUnit.toNext) {
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return createOfCurrentMagnitude();
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} else {
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amount = amount / currentUnit.toNext;
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unitMagnitude += 1;
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unitsLeft = (unitMagnitude < unitSpecs.length - 1);
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}
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}
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return createOfCurrentMagnitude;
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}
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};
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unitSpecs.forEach((otherSpec, otherI) => {
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let factor = 1;
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if (otherI < i) {
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/* Convert downwards, to smaller units (== larger numbers) */
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unitSpecs.slice(otherI, i).reverse().forEach((specStep) => {
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factor = factor * specStep.toNext;
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});
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} else if (otherI > i) {
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/* Convert upwards, to larger units (== smaller numbers) */
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unitSpecs.slice(i, otherI).forEach((specStep) => {
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factor = factor / specStep.toNext;
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});
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}
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proto[`to${capitalize(otherSpec.unit)}`] = function () {
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return resultObject[otherSpec.unit](this.amount * factor);
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};
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});
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resultObject[spec.unit] = function createUnit(value) {
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if (typeof value !== "number") {
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throw new Error("Value must be numeric");
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} else {
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return Object.assign(Object.create(proto), {
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unit: spec.unit,
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amount: value
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});
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}
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};
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});
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return resultObject;
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}; |