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import { DEV } from 'esm-env';
import { on_destroy } from './index.js';
import * as e from '../shared/errors.js';
/** @type {Component | null} */
export var current_component = null;
/**
* @template T
* @param {any} key
* @returns {T}
*/
export function getContext(key) {
const context_map = get_or_init_context_map('getContext');
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) {
get_or_init_context_map('setContext').set(key, context);
return context;
}
/**
* @param {any} key
* @returns {boolean}
*/
export function hasContext(key) {
return get_or_init_context_map('hasContext').has(key);
}
/** @returns {Map<any, any>} */
export function getAllContexts() {
return get_or_init_context_map('getAllContexts');
}
/**
* @param {string} name
* @returns {Map<unknown, unknown>}
*/
function get_or_init_context_map(name) {
if (current_component === null) {
e.lifecycle_outside_component(name);
}
return (current_component.c ??= new Map(get_parent_context(current_component) || undefined));
}
/**
* @param {Function} [fn]
*/
export function push(fn) {
current_component = { p: current_component, c: null, d: null };
if (DEV) {
// component function
current_component.function = fn;
}
}
export function pop() {
var component = /** @type {Component} */ (current_component);
var ondestroy = component.d;
if (ondestroy) {
on_destroy.push(...ondestroy);
}
current_component = component.p;
}
/**
* @param {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;
}
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