app/webpacker/js/services/variant_unit_manager.js
// Requires global variable from page: ofn_available_units_sorted
export default class VariantUnitManager {
constructor() {
this.units = this.#loadUnits(ofn_available_units_sorted);
}
getUnitName(scale, unitType) {
if (this.units[unitType][scale]) {
return this.units[unitType][scale]['name'];
} else {
return '';
}
};
// Filter by measurement system
compatibleUnitScales(scale, unitType) {
const scaleSystem = this.units[unitType][scale]['system'];
return Object.entries(this.units[unitType])
.filter(([scale, scaleInfo]) => {
return scaleInfo['system'] == scaleSystem;
})
.map(([scale, _]) => parseFloat(scale))
.sort();
}
// private
#loadUnits(units) {
// Transform unit scale to a JS Number for compatibility. This would be way simpler in Ruby or Coffeescript!!
const unitsTransformed = Object.entries(units).map(([measurement, measurementInfo]) => {
const measurementInfoTransformed = Object.fromEntries(Object.entries(measurementInfo).map(([scale, unitInfo]) =>
[ parseFloat(scale), unitInfo ]
));
return [ measurement, measurementInfoTransformed ];
});
return Object.fromEntries(unitsTransformed);
}
}