93 lines
2.5 KiB
TypeScript
93 lines
2.5 KiB
TypeScript
// Copyright: Ankitects Pty Ltd and contributors
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// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
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export interface Identifiable {
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id?: string;
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}
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interface IterableIdentifiable<T extends Identifiable> extends Identifiable {
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items: T[];
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}
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export type Identifier = string | number;
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function normalize<T extends Identifiable>(
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iterable: IterableIdentifiable<T>,
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idOrIndex: Identifier
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): number {
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let normalizedIndex: number;
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if (typeof idOrIndex === "string") {
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normalizedIndex = iterable.items.findIndex((value) => value.id === idOrIndex);
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} else if (idOrIndex < 0) {
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normalizedIndex = iterable.items.length + idOrIndex;
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} else {
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normalizedIndex = idOrIndex;
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}
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return normalizedIndex >= iterable.items.length ? -1 : normalizedIndex;
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}
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function search<T extends Identifiable>(values: T[], index: number): T | null {
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return index >= 0 ? values[index] : null;
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}
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export function insert<T extends Identifiable>(
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iterable: IterableIdentifiable<T> & T,
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value: T,
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idOrIndex: Identifier
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): IterableIdentifiable<T> & T {
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const index = normalize(iterable, idOrIndex);
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if (index >= 0) {
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iterable.items = iterable.items.slice();
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iterable.items.splice(index, 0, value);
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}
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return iterable;
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}
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export function add<T extends Identifiable>(
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iterable: IterableIdentifiable<T> & T,
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value: T,
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idOrIndex: Identifier
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): IterableIdentifiable<T> & T {
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const index = normalize(iterable, idOrIndex);
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if (index >= 0) {
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iterable.items = iterable.items.slice();
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iterable.items.splice(index + 1, 0, value);
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}
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return iterable;
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}
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function isRecursive<T>(component: Identifiable): component is IterableIdentifiable<T> {
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return Boolean(Object.prototype.hasOwnProperty.call(component, "items"));
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}
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export function updateRecursive<T extends Identifiable>(
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update: (component: T) => T,
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component: T,
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...identifiers: Identifier[]
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): T {
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if (identifiers.length === 0) {
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return update(component);
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} else if (isRecursive<T>(component)) {
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const [identifier, ...restIdentifiers] = identifiers;
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const normalizedIndex = normalize(component, identifier);
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const foundComponent = search(component.items, normalizedIndex);
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if (foundComponent) {
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component.items[normalizedIndex] = updateRecursive(
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update,
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foundComponent as T,
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...restIdentifiers
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);
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}
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return component;
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}
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return component;
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}
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