97 lines
2.7 KiB
JavaScript
97 lines
2.7 KiB
JavaScript
import Helper from '@ember/component/helper';
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import { inject as service } from '@ember/service';
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import { runInDebug } from '@ember/debug';
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import MultiMap from 'mnemonist/multi-map';
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// keep a record or attrs
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const attrs = new Map();
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// keep a record of hashes privately
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const wm = new WeakMap();
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export default class DocumentAttrsHelper extends Helper {
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@service('-document') document;
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compute(params, hash) {
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this.synchronize(this.document.documentElement, hash);
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}
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willDestroy() {
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this.synchronize(this.document.documentElement);
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wm.delete(this);
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}
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synchronize(root, hash) {
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const prev = wm.get(this);
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if (prev) {
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// if this helper was already setting a property then remove them from
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// our book keeping
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Object.entries(prev).forEach(([key, value]) => {
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let map = attrs.get(key);
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if (typeof map !== 'undefined') {
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[...new Set(value.split(' '))].map((val) => map.remove(val, this));
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}
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});
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}
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if (hash) {
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// if we are setting more properties add them to our book keeping
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wm.set(this, hash);
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[...Object.entries(hash)].forEach(([key, value]) => {
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let values = attrs.get(key);
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if (typeof values === 'undefined') {
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values = new MultiMap(Set);
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attrs.set(key, values);
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}
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[...new Set(value.split(' '))].map((val) => {
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if (values.count(val) === 0) {
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values.set(val, null);
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}
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values.set(val, this);
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});
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});
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}
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[...attrs.entries()].forEach(([attr, values]) => {
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let type = 'attr';
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if (attr === 'class') {
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type = attr;
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} else if (attr.startsWith('data-')) {
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type = 'data';
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}
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// go through our list of properties and synchronize the DOM
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// properties with our properties
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[...values.keys()].forEach((value) => {
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if (values.count(value) === 1) {
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switch (type) {
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case 'class':
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root.classList.remove(value);
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break;
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case 'data':
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default:
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runInDebug(() => {
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throw new Error(`${type} is not implemented yet`);
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});
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}
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values.delete(value);
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// remove the property if it has no values
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if (values.size === 0) {
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attrs.delete(attr);
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}
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} else {
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switch (type) {
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case 'class':
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root.classList.add(value);
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break;
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case 'data':
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default:
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runInDebug(() => {
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throw new Error(`${type} is not implemented yet`);
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});
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}
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}
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});
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});
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return attrs;
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}
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}
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