All files / src/internal/server context.js

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import { DEV } from 'esm-env';
import { on_destroy } from './index.js';
 
/** @type {import('#server').Component | null} */
export var current_component = null;
 
/**
 * @template T
 * @param {any} key
 * @returns {T}
 */
export function getContext(key) {
	const context_map = getAllContexts();
	const result = /** @type {T} */ (context_map.get(key));
 
	return result;
}
 
/**
 * @template T
 * @param {any} key
 * @param {T} context
 * @returns {T}
 */
export function setContext(key, context) {
	getAllContexts().set(key, context);
	return context;
}
 
/**
 * @param {any} key
 * @returns {boolean}
 */
export function hasContext(key) {
	return getAllContexts().has(key);
}
 
/** @returns {Map<any, any>} */
export function getAllContexts() {
	const context = current_component;
 
	if (context === null) {
		throw new Error(
			'ERR_SVELTE_ORPHAN_CONTEXT' +
				(DEV ? 'Context can only be used during component initialisation.' : '')
		);
	}
 
	return (context.c ??= new Map(get_parent_context(context) || undefined));
}
 
export function push() {
	current_component = { p: current_component, c: null, d: null };
}
 
export function pop() {
	var component = /** @type {import('#server').Component} */ (current_component);
 
	var ondestroy = component.d;
 
	if (ondestroy) {
		on_destroy.push(...ondestroy);
	}
 
	current_component = component.p;
}
 
/**
 * @param {import('#server').Component} component_context
 * @returns {Map<unknown, unknown> | null}
 */
function get_parent_context(component_context) {
	let parent = component_context.p;
 
	while (parent !== null) {
		const context_map = parent.c;
		if (context_map !== null) {
			return context_map;
		}
		parent = parent.p;
	}
 
	return null;
}