import EmberObject, { computed, get } from "@ember/object"; import extractValue from "./extract-value"; export default function handleDescriptor(target, key, desc, params = []) { const val = extractValue(desc); if (typeof val === "function" && target instanceof EmberObject) { // We're in a native class, so convert the method to a getter first desc.writable = false; desc.initializer = undefined; desc.value = undefined; desc.get = callUserSuppliedGet(params, val); return computed(target, key, desc); } else { return { enumerable: desc.enumerable, configurable: desc.configurable, writable: desc.writable, initializer() { let computedDescriptor; if (desc.writable) { if (typeof val === "object") { let value = {}; if (val.get) { value.get = callUserSuppliedGet(params, val.get); } if (val.set) { value.set = callUserSuppliedSet(params, val.set); } computedDescriptor = value; } else { computedDescriptor = callUserSuppliedGet(params, val); } } else { throw new Error( "ember-computed-decorators does not support using getters and setters" ); } return computed.apply(null, params.concat(computedDescriptor)); }, }; } } function niceAttr(attr) { const parts = attr.split("."); let i; for (i = 0; i < parts.length; i++) { if ( parts[i] === "@each" || parts[i] === "[]" || parts[i].indexOf("{") !== -1 ) { break; } } return parts.slice(0, i).join("."); } function callUserSuppliedGet(params, func) { params = params.map(niceAttr); return function () { let paramValues = params.map((p) => get(this, p)); return func.apply(this, paramValues); }; } function callUserSuppliedSet(params, func) { params = params.map(niceAttr); return function (key, value) { let paramValues = params.map((p) => get(this, p)); paramValues.unshift(value); return func.apply(this, paramValues); }; }