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import * as _ from './utils'
export class CustomElementRegistry {
/** Defines a new custom element using the given tag name and HTMLElement constructor. */
define(name: string, constructor: Function, options?: ElementDefinitionOptions) {
const internals = _.internalsOf<CustomElementRegistryInternals>(this, 'CustomElementRegistry', 'define')
name = String(name)
if (/[A-Z]/.test(name)) throw new SyntaxError('Custom element name cannot contain an uppercase ASCII letter')
if (!/^[a-z]/.test(name)) throw new SyntaxError('Custom element name must have a lowercase ASCII letter as its first character')
if (!/-/.test(name)) throw new SyntaxError('Custom element name must contain a hyphen')
internals.constructorByName.set(name, constructor)
internals.nameByConstructor.set(constructor, name)
void options
}
/** Returns the constructor associated with the given tag name. */
get(name: string) {
const internals = _.internalsOf<CustomElementRegistryInternals>(this, 'CustomElementRegistry', 'get')
name = String(name).toLowerCase()
return internals.constructorByName.get(name)
}
getName(constructor: Function) {
const internals = _.internalsOf<CustomElementRegistryInternals>(this, 'CustomElementRegistry', 'getName')
return internals.nameByConstructor.get(constructor)
}
}
_.allowStringTag(CustomElementRegistry)
interface CustomElementRegistryInternals {
constructorByName: Map<string, Function>;
nameByConstructor: Map<Function, string>;
}
interface ElementDefinitionOptions {
extends?: string | undefined;
}
export const initCustomElementRegistry = (target: Record<any, any>, exclude: Set<string>) => {
if (exclude.has('customElements')) return
const CustomElementRegistry = target.CustomElementRegistry || globalThis.CustomElementRegistry
const customElements: CustomElementRegistry = target.customElements = Object.create(CustomElementRegistry.prototype)
_.INTERNALS.set(customElements, {
constructorByName: new Map,
nameByConstructor: new Map,
} as CustomElementRegistryInternals)
}
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