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165 lines
4.6 KiB
JavaScript
165 lines
4.6 KiB
JavaScript
import {kebabToCamel, camelToKebab} from "./text";
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/**
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* A mapping of active components keyed by name, with values being arrays of component
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* instances since there can be multiple components of the same type.
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* @type {Object<String, Component[]>}
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*/
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const components = {};
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/**
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* A mapping of component class models, keyed by name.
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* @type {Object<String, Constructor<Component>>}
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*/
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const componentModelMap = {};
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/**
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* A mapping of active component maps, keyed by the element components are assigned to.
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* @type {WeakMap<Element, Object<String, Component>>}
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*/
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const elementComponentMap = new WeakMap();
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/**
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* Initialize a component instance on the given dom element.
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* @param {String} name
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* @param {Element} element
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*/
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function initComponent(name, element) {
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/** @type {Function<Component>|undefined} **/
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const componentModel = componentModelMap[name];
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if (componentModel === undefined) return;
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// Create our component instance
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/** @type {Component} **/
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let instance;
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try {
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instance = new componentModel();
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instance.$name = name;
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instance.$el = element;
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const allRefs = parseRefs(name, element);
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instance.$refs = allRefs.refs;
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instance.$manyRefs = allRefs.manyRefs;
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instance.$opts = parseOpts(name, element);
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instance.setup();
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} catch (e) {
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console.error('Failed to create component', e, name, element);
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}
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// Add to global listing
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if (typeof components[name] === "undefined") {
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components[name] = [];
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}
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components[name].push(instance);
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// Add to element mapping
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const elComponents = elementComponentMap.get(element) || {};
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elComponents[name] = instance;
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elementComponentMap.set(element, elComponents);
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}
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/**
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* Parse out the element references within the given element
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* for the given component name.
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* @param {String} name
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* @param {Element} element
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*/
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function parseRefs(name, element) {
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const refs = {};
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const manyRefs = {};
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const prefix = `${name}@`
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const selector = `[refs*="${prefix}"]`;
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const refElems = [...element.querySelectorAll(selector)];
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if (element.matches(selector)) {
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refElems.push(element);
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}
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for (const el of refElems) {
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const refNames = el.getAttribute('refs')
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.split(' ')
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.filter(str => str.startsWith(prefix))
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.map(str => str.replace(prefix, ''))
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.map(kebabToCamel);
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for (const ref of refNames) {
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refs[ref] = el;
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if (typeof manyRefs[ref] === 'undefined') {
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manyRefs[ref] = [];
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}
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manyRefs[ref].push(el);
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}
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}
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return {refs, manyRefs};
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}
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/**
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* Parse out the element component options.
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* @param {String} name
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* @param {Element} element
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* @return {Object<String, String>}
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*/
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function parseOpts(name, element) {
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const opts = {};
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const prefix = `option:${name}:`;
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for (const {name, value} of element.attributes) {
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if (name.startsWith(prefix)) {
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const optName = name.replace(prefix, '');
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opts[kebabToCamel(optName)] = value || '';
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}
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}
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return opts;
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}
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/**
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* Initialize all components found within the given element.
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* @param {Element|Document} parentElement
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*/
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export function init(parentElement = document) {
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const componentElems = parentElement.querySelectorAll(`[component],[components]`);
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for (const el of componentElems) {
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const componentNames = `${el.getAttribute('component') || ''} ${(el.getAttribute('components'))}`.toLowerCase().split(' ').filter(Boolean);
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for (const name of componentNames) {
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initComponent(name, el);
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}
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}
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}
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/**
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* Register the given component mapping into the component system.
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* @param {Object<String, ObjectConstructor<Component>>} mapping
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*/
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export function register(mapping) {
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const keys = Object.keys(mapping);
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for (const key of keys) {
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componentModelMap[camelToKebab(key)] = mapping[key];
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}
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}
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/**
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* Get the first component of the given name.
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* @param {String} name
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* @returns {Component|null}
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*/
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export function first(name) {
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return (components[name] || [null])[0];
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}
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/**
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* Get all the components of the given name.
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* @param {String} name
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* @returns {Component[]}
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*/
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export function get(name) {
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return components[name] || [];
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}
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/**
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* Get the first component, of the given name, that's assigned to the given element.
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* @param {Element} element
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* @param {String} name
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* @returns {Component|null}
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*/
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export function firstOnElement(element, name) {
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const elComponents = elementComponentMap.get(element) || {};
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return elComponents[name] || null;
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} |