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dom-shim.js
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dom-shim.js
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function noop() { }
// https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleSheet/CSSStyleSheet
class CSSStyleSheet {
insertRule() { }
deleteRule() { }
replace() { }
replaceSync() { }
}
// https://developer.mozilla.org/en-US/docs/Web/API/EventTarget
class EventTarget {
constructor() {
this.addEventListener = noop;
}
}
// https://developer.mozilla.org/en-US/docs/Web/API/Node
// EventTarget <- Node
// TODO should be an interface?
class Node extends EventTarget {
// eslint-disable-next-line
cloneNode(deep) {
return this;
}
appendChild(node) {
this.innerHTML = this.innerHTML ? this.innerHTML += node.innerHTML : node.innerHTML;
}
}
// https://developer.mozilla.org/en-US/docs/Web/API/Element
// EventTarget <- Node <- Element
class Element extends Node {
constructor() {
super();
this.shadowRoot = null;
this.innerHTML = '';
this.attributes = {};
}
attachShadow(options) {
this.shadowRoot = new ShadowRoot(options);
return this.shadowRoot;
}
// https://github.com/mfreed7/declarative-shadow-dom/blob/master/README.md#serialization
// eslint-disable-next-line
getInnerHTML() {
return this.shadowRoot ? this.shadowRoot.innerHTML : this.innerHTML;
}
setAttribute(name, value) {
this.attributes[name] = value;
}
getAttribute(name) {
return this.attributes[name];
}
hasAttribute(name) {
return !!this.attributes[name];
}
}
// https://developer.mozilla.org/en-US/docs/Web/API/Document
// EventTarget <- Node <- Document
class Document extends Node {
createElement(tagName) {
switch (tagName) {
case 'template':
return new HTMLTemplateElement();
default:
return new HTMLElement();
}
}
createDocumentFragment(html) {
return new DocumentFragment(html);
}
}
// https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement
// EventTarget <- Node <- Element <- HTMLElement
class HTMLElement extends Element {
connectedCallback() { }
}
// https://developer.mozilla.org/en-US/docs/Web/API/DocumentFragment
// EventTarget <- Node <- DocumentFragment
class DocumentFragment extends Node { }
// https://developer.mozilla.org/en-US/docs/Web/API/ShadowRoot
// EventTarget <- Node <- DocumentFragment <- ShadowRoot
class ShadowRoot extends DocumentFragment {
constructor(options) {
super();
this.mode = options.mode || 'closed';
this.adoptedStyleSheets = [];
}
}
// https://developer.mozilla.org/en-US/docs/Web/API/HTMLTemplateElement
// EventTarget <- Node <- Element <- HTMLElement <- HTMLTemplateElement
class HTMLTemplateElement extends HTMLElement {
constructor() {
super();
this.content = new DocumentFragment();
}
// TODO open vs closed shadow root
set innerHTML(html) {
if (this.content) {
this.content.innerHTML = `
<template shadowrootmode="open">
${html}
</template>
`;
}
}
get innerHTML() {
return this.content && this.content.innerHTML ? this.content.innerHTML : undefined;
}
}
// https://developer.mozilla.org/en-US/docs/Web/API/CustomElementRegistry
class CustomElementsRegistry {
constructor() {
// TODO this should probably be a set or otherwise follow the spec?
// https://github.com/ProjectEvergreen/wcc/discussions/145
this.customElementsRegistry = new Map();
}
define(tagName, BaseClass) {
// TODO this should probably fail as per the spec...
// e.g. if(this.customElementsRegistry.get(tagName))
// https://github.com/ProjectEvergreen/wcc/discussions/145
this.customElementsRegistry.set(tagName, BaseClass);
}
get(tagName) {
return this.customElementsRegistry.get(tagName);
}
}
// mock top level aliases (globalThis === window)
// https://developer.mozilla.org/en-US/docs/Web/API/Window
// make this "idempotent" for now until a better idea comes along - https://github.com/ProjectEvergreen/wcc/discussions/145
globalThis.addEventListener = globalThis.addEventListener ?? noop;
globalThis.document = globalThis.document ?? new Document();
globalThis.customElements = globalThis.customElements ?? new CustomElementsRegistry();
globalThis.HTMLElement = globalThis.HTMLElement ?? HTMLElement;
globalThis.CSSStyleSheet = globalThis.CSSStyleSheet ?? CSSStyleSheet;