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// Warning: The concept of "interceptors" in Alpine is not public API and is subject to change // without tagging a major release. export function initInterceptors(data) { let isObject = val => typeof val === 'object' && !Array.isArray(val) && val !== null let recurse = (obj, basePath = '') => { Object.entries(Object.getOwnPropertyDescriptors(obj)).forEach(([key, { value, enumerable }]) => { // Skip getters. if (enumerable === false || value === undefined) return let path = basePath === '' ? key : `${basePath}.${key}` if (typeof value === 'object' && value !== null && value._x_interceptor) { obj[key] = value.initialize(data, path, key) } else { if (isObject(value) && value !== obj && ! (value instanceof Element)) { recurse(value, path) } } }) } return recurse(data) } export function interceptor(callback, mutateObj = () => {}) { let obj = { initialValue: undefined, _x_interceptor: true, initialize(data, path, key) { return callback(this.initialValue, () => get(data, path), (value) => set(data, path, value), path, key) } } mutateObj(obj) return initialValue => { if (typeof initialValue === 'object' && initialValue !== null && initialValue._x_interceptor) { // Support nesting interceptors. let initialize = obj.initialize.bind(obj) obj.initialize = (data, path, key) => { let innerValue = initialValue.initialize(data, path, key) obj.initialValue = innerValue return initialize(data, path, key) } } else { obj.initialValue = initialValue } return obj } } function get(obj, path) { return path.split('.').reduce((carry, segment) => carry[segment], obj) } function set(obj, path, value) { if (typeof path === 'string') path = path.split('.') if (path.length === 1) obj[path[0]] = value; else if (path.length === 0) throw error; else { if (obj[path[0]]) return set(obj[path[0]], path.slice(1), value); else { obj[path[0]] = {}; return set(obj[path[0]], path.slice(1), value); } } }
