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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.set(constructor, {
attributes: {},
localName: name,
} as any)
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 ||
(target.customElements = new CustomElementRegistry())
_.INTERNALS.set(customElements, {
constructorByName: new Map(),
nameByConstructor: new Map(),
} as CustomElementRegistryInternals)
}
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