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import { getContext } from 'svelte';
export const UNIQUE_ID_CONTEXT_NAME = 'amp-web-unique-id';
interface UniqueContext {
nextId: number;
}
// TODO: rdar://84029606 (Extract logger into shared util)
interface Logger {
warn(...args: any[]): string;
}
interface LoggerFactory {
loggerFor(name: string): Logger;
}
export function initializeUniqueIdContext(
context: Map<string, unknown>,
loggerFactory: LoggerFactory,
): void {
const logger = loggerFactory.loggerFor('uniqueIdContext');
if (context.has(UNIQUE_ID_CONTEXT_NAME)) {
logger.warn(
`${UNIQUE_ID_CONTEXT_NAME} context has already been created. Cannot be created more than once`,
);
} else {
const INITAL_STATE: UniqueContext = { nextId: 0 };
context.set(UNIQUE_ID_CONTEXT_NAME, INITAL_STATE);
}
}
/**
* Creates a unique Id string based on string provided
*
* @returns unique id string
*/
export type UniqueIdGenerator = () => string;
// Custom elements most likely will not be used in an environment has that initialized the Svelte
// context. Components that are later wrapped by a custom element should use this function so that
// they can generate unique ids automatically when used inside a Svelte app, but not throw an error
// when used in other contexts.
//
export function maybeGetUniqueIdGenerator(): UniqueIdGenerator | undefined {
const UNIQUE_ID_PREFIX = 'uid-';
const state: UniqueContext = getContext(UNIQUE_ID_CONTEXT_NAME);
const isNextIdANumber = typeof state?.nextId === 'number';
if (!isNextIdANumber) {
return;
}
return () => {
const id = `${UNIQUE_ID_PREFIX}${state.nextId}`;
state.nextId += 1;
return id;
};
}
export function getUniqueIdGenerator(): UniqueIdGenerator {
const uniqueIdGenerator = maybeGetUniqueIdGenerator();
if (!uniqueIdGenerator) {
throw new Error(
`${UNIQUE_ID_CONTEXT_NAME} context has not been initialized. Initialize at application bootstrap.`,
);
}
return uniqueIdGenerator;
}
|
