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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,214 @@ | ||
| /** | ||
| * ProxyPolyfill is a dump wrapper for `handler` | ||
| * where `target` is a map and is always passed as parameter. | ||
| */ | ||
| class MapProxyPolyfill { | ||
| /** | ||
| * Creates ProxyPolyfill and defines methos dynamically. | ||
| * All methods are a dump wrapper to `handler` methods with `target` as first parameter. | ||
| */ | ||
| constructor(target, handler) { | ||
| this.target = target | ||
| for (const item in handler) { | ||
| if (Object.prototype.hasOwnProperty.call(handler, item)) { | ||
| this[item] = (...args) => handler[item](this.target, ...args) | ||
| } | ||
| } | ||
|
|
||
|
|
||
| // Implements `getOwnPropertyNames` method for wrapped class. | ||
| // This is needed because it is not possible to override `Object.getOwnPropertyNames()` without a `Proxy`. | ||
| // | ||
| // This method is a dump wrapper of `ownKey()` so it must be created only if the handle has `ownKey()` method. | ||
| // (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/ownKeys for more info) | ||
| if (typeof handler.ownKeys === 'function') { | ||
| this.getOwnPropertyNames = () => handler.ownKeys(this.target) | ||
| } | ||
|
|
||
| // Implements `assign` method for wrapped class. | ||
| // This is needed because it is not possible to override `Object.assign()` without a `Proxy`. | ||
| if (typeof handler.set === 'function') { | ||
| this.assign = (object) => { | ||
| Object.keys(object).forEach(function(key) { | ||
| handler.set(target, key, object[key]) | ||
| }) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| iterator () { | ||
| // NOTE: this method used to be a generator; it has been converted to a regular | ||
| // method (that mimics the interface of a generator) to avoid having to include | ||
| // generator polyfills in the distribution build. | ||
| // eslint-disable-next-line consistent-this | ||
| const doc = this | ||
| let keys = doc.ownKeys() | ||
| let index = 0 | ||
| return { | ||
| next () { | ||
| let key = keys[index] | ||
| if (!key) return { value: undefined, done: true } | ||
| index = index + 1 | ||
| return {value: [key, doc.get(key)], done: false} | ||
| }, | ||
| [Symbol.iterator]: () => this.iterator(), | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Defines iterator. Iterates the map's key and values | ||
| */ | ||
| [Symbol.iterator] () { | ||
| return this.iterator() | ||
| } | ||
|
|
||
| /** | ||
| * To be used by JSON.stringify() function. | ||
| * It returns the wrapped instance. | ||
| * (more info https://javascript.info/json#custom-tojson) | ||
| */ | ||
| toJSON () { | ||
| const { context, objectId } = this.target | ||
| let object = context.getObject(objectId) | ||
| return object | ||
| } | ||
|
|
||
| /** | ||
| * Implements isArray method for wrapped class. | ||
| * This is needed because it is not possible to override Array.isArray() without a Proxy. | ||
| */ | ||
| isArray () { | ||
| return false | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * ListProxyPolyfill is a dump wrapper for `handler` | ||
| * where `target` is an array and is always passed as parameter. | ||
| */ | ||
| class ListProxyPolyfill { | ||
| /** | ||
| * Creates ListProxyPolyfill and defines methos dynamically. | ||
| * All methods are a dump wrapper to `handler` methods with `target` as first parameter. | ||
| */ | ||
| constructor(target, handler, listMethods) { | ||
| this.target = target | ||
| for (const item in handler) { | ||
| if (Object.prototype.hasOwnProperty.call(handler, item)) { | ||
| this[item] = (...args) => handler[item](this.target, ...args) | ||
| } | ||
| } | ||
|
|
||
| // Casts `key` to string before calling `handler`s `get` method. | ||
| // This is needed because Proxy does so and the handler is prepared for that. | ||
| this.get = (key) => { | ||
| if (typeof key == 'number') { | ||
| key = key.toString() | ||
| } | ||
| return handler.get(this.target, key) | ||
| } | ||
|
|
||
| // Casts `key` to string before calling `handler`s `get` method. | ||
| // This is needed because Proxy does so and the handler is prepared for that. | ||
| this.has = (key) => { | ||
| if (typeof key == 'number') { | ||
| key = key.toString() | ||
| } | ||
| return handler.has(this.target, key) | ||
| } | ||
|
|
||
|
|
||
| // Implements `objectKeys` method for wrapped class. | ||
| // This is needed because it is not possible to override `Object.keys()` without a `Proxy`. | ||
| // | ||
| // This method returns only enumerable property names. | ||
| // (more info https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys) | ||
| if (typeof handler.ownKeys === 'function' && typeof handler.getOwnPropertyDescriptor === 'function') { | ||
| this.objectKeys = () => { | ||
| let keys = [] | ||
| for (let key of handler.ownKeys(this.target)) { | ||
| let description = handler.getOwnPropertyDescriptor(this.target, key) | ||
| if (description.enumerable) { | ||
| keys.push(key) | ||
| } | ||
| } | ||
| return keys | ||
| } | ||
| } | ||
|
|
||
| // Implements `getOwnPropertyNames` method for wrapped class. | ||
| // This is needed because it is not possible to override `Object.getOwnPropertyNames()` without a `Proxy`. | ||
| // | ||
| // This method is a dump wrapper of `ownKey()` so it must be created only if the handle has `ownKey()` method. | ||
| // (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/ownKeys for more info) | ||
| if (typeof handler.ownKeys === 'function') { | ||
| this.getOwnPropertyNames = () => handler.ownKeys(this.target) | ||
| } | ||
|
|
||
| // Defines same methods as listMethods | ||
| // All methods are a dump wrapper to the ones defined on listMethods. | ||
| const [context, objectId, path] = target | ||
| const _listMethods = listMethods(context, objectId, path) | ||
| for (const methodName in _listMethods) { | ||
| if (Object.prototype.hasOwnProperty.call(_listMethods, methodName)) { | ||
| this[methodName] = (...args) => _listMethods[methodName](...args) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| iterator () { | ||
| // NOTE: this method used to be a generator; it has been converted to a regular | ||
| // method (that mimics the interface of a generator) to avoid having to include | ||
| // generator polyfills in the distribution build. | ||
| // eslint-disable-next-line consistent-this | ||
| let doc = this | ||
| let keysIterator = doc.keys() | ||
| return { | ||
| next () { | ||
| let nextKey = keysIterator.next() | ||
| if (nextKey.done) return nextKey | ||
| return {value: doc.get(nextKey.value), done: false} | ||
| }, | ||
| [Symbol.iterator]: () => this.iterator(), | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Defines iterator. Iterates the array's values | ||
| */ | ||
| [Symbol.iterator] () { | ||
| return this.iterator() | ||
| } | ||
|
|
||
| /** | ||
| * Implements isArray method for wrapped class. | ||
| * This is needed because it is not possible to override Array.isArray() without a Proxy. | ||
| */ | ||
| isArray () { | ||
| return true | ||
| } | ||
|
|
||
| /** | ||
| * Implements length method for wrapped class. | ||
| * This is needed because it is not possible to override .length without a Proxy. | ||
| */ | ||
| length () { | ||
| const [context, objectId, /* path */] = this.target | ||
| const object = context.getObject(objectId) | ||
| return object.length | ||
| } | ||
|
|
||
| /** | ||
| * To be used by JSON.stringify() function. | ||
| * It returns the wrapped instance. | ||
| * (more info https://javascript.info/json#custom-tojson) | ||
| */ | ||
| toJSON () { | ||
| const [ context, objectId ] = this.target | ||
| let object = context.getObject(objectId) | ||
| return object | ||
| } | ||
| } | ||
|
|
||
|
|
||
| module.exports = { ListProxyPolyfill, MapProxyPolyfill } |
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