@ortoo/angular-resource/lib/array-emitter.js

Magical CRUD resource management for angular

import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import { EventEmitter } from './emitter';
const ArrayProto = Array.prototype;
export class ArrayEmitter extends Array {
    constructor(...args) {
        super(...args);
        let arr = this;
        // Non enumerable so that we can send the array over postMessage
        Object.defineProperty(arr, '$emitter', {
            enumerable: false,
            value: new EventEmitter(),
        });
        Object.defineProperty(arr, '$subject', {
            enumerable: false,
            value: new BehaviorSubject(this),
        });
        this.$emitter.on('update', () => {
            this.$subject.next(this);
        });
        // Generate our Array Emitter methods
        let ArrayEmitterMethods = {};
        ['on', 'off', 'listen', 'once', 'addListener', 'removeListener'].forEach(key => {
            ArrayEmitterMethods[key] = {
                enumerable: false,
                value: (...methodArgs) => {
                    return this.$emitter[key](...methodArgs);
                },
            };
        });
        // These methods create new arrays
        ['reverse', 'sort', 'splice'].forEach(key => {
            ArrayEmitterMethods[key] = {
                enumerable: false,
                value: (...methodArgs) => {
                    let emitter = this.$emitter;
                    emitter.on('update', () => {
                        ArrayProto[key].apply(this, methodArgs);
                    });
                    ArrayProto[key].apply(this, methodArgs);
                    return this;
                },
            };
        });
        ['filter', 'map', 'slice'].forEach(key => {
            ArrayEmitterMethods[key] = {
                enumerable: false,
                value: (...methodArgs) => {
                    let newArr = new ArrayEmitter();
                    let emitter = this.$emitter;
                    emitter.on('update', () => {
                        updateNewArr(ArrayProto[key].apply(this, methodArgs));
                        newArr.$emitter.emit('update', newArr);
                    });
                    updateNewArr(ArrayProto[key].apply(this, methodArgs));
                    function updateNewArr(updatedArr) {
                        newArr.length = 0;
                        for (let i = 0; i < updatedArr.length; i++) {
                            newArr.push(updatedArr[i]);
                        }
                    }
                    return newArr;
                },
            };
        });
        ArrayEmitterMethods.concat = {
            enumerable: false,
            value: (...methodArgs) => {
                let newArr = new ArrayEmitter();
                let allArrs = [this, ...methodArgs];
                let qries = allArrs.filter((obj) => (obj.$emitter && Array.isArray(obj)));
                qries.forEach((qry) => {
                    let emitter = qry.$emitter;
                    emitter.on('update', () => {
                        updateConcat();
                        newArr.$emitter.emit('update', newArr);
                    });
                });
                updateConcat();
                return newArr;
                function updateConcat() {
                    let concatted = ArrayProto.concat.call(this, ...methodArgs);
                    newArr.length = 0;
                    newArr.push(...concatted);
                }
            },
        };
        Object.defineProperties(arr, ArrayEmitterMethods);
    }
}
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{ BehaviorSubject } from 'rxjs/BehaviorSubject';\n\nimport {EventEmitter, Handler, Subscription} from './emitter';\nimport {ArrayEmitter as IArrayEmitter} from './types';\n\nconst ArrayProto = Array.prototype;\n\nexport class ArrayEmitter<T> extends Array<T> implements IArrayEmitter<T> {\n\n  public $emitter: EventEmitter;\n  public $subject: BehaviorSubject<ArrayEmitter<T>>;\n  public on: {(name: string, handler: Handler): void};\n  public off: {(name: string, handler: Handler): void};\n  public listen: {(name: string, handler: Handler): Subscription};\n  public once: {(name: string, handler: Handler): void};\n  public addListener: {(name: string, handler: Handler): void};\n  public removeListener: {(name: string, handler: Handler): void};\n\n  constructor(...args: any[]) {\n    super(...args);\n    let arr = this;\n\n    // Non enumerable so that we can send the array over postMessage\n    Object.defineProperty(arr, '$emitter', {\n      enumerable: false,\n      value: new EventEmitter(),\n    });\n\n    Object.defineProperty(arr, '$subject', {\n      enumerable: false,\n      value: new BehaviorSubject(this),\n    });\n\n    this.$emitter.on('update', () => {\n      this.$subject.next(this);\n    });\n\n    // Generate our Array Emitter methods\n    let ArrayEmitterMethods: any = {};\n    ['on', 'off', 'listen', 'once', 'addListener', 'removeListener'].forEach(key => {\n      ArrayEmitterMethods[key] = {\n        enumerable: false,\n        value: (...methodArgs: any[]) => {\n          return this.$emitter[key](...methodArgs);\n        },\n      };\n    });\n\n    // These methods create new arrays\n    ['reverse', 'sort', 'splice'].forEach(key => {\n      ArrayEmitterMethods[key] = {\n        enumerable: false,\n        value: (...methodArgs: any[]) => {\n          let emitter = this.$emitter;\n          emitter.on('update', () => {\n            ArrayProto[key].apply(this, methodArgs);\n          });\n\n          ArrayProto[key].apply(this, methodArgs);\n          return this;\n        },\n      };\n    });\n\n    ['filter', 'map', 'slice'].forEach(key => {\n      ArrayEmitterMethods[key] = {\n        enumerable: false,\n        value: (...methodArgs: any[]) => {\n          let newArr: any = new ArrayEmitter();\n          let emitter = this.$emitter;\n          emitter.on('update', () => {\n            updateNewArr(ArrayProto[key].apply(this, methodArgs));\n            newArr.$emitter.emit('update', newArr);\n          });\n\n          updateNewArr(ArrayProto[key].apply(this, methodArgs));\n\n          function updateNewArr(updatedArr: any[]) {\n            newArr.length = 0;\n            for (let i = 0; i < updatedArr.length; i++) { // tslint:disable-line prefer-for-of\n              newArr.push(updatedArr[i]);\n            }\n          }\n\n          return newArr;\n        },\n      };\n    });\n\n    ArrayEmitterMethods.concat = {\n      enumerable: false,\n      value: (...methodArgs: any[]) => {\n        let newArr = new ArrayEmitter();\n        let allArrs = [this, ...methodArgs];\n        let qries = allArrs.filter((obj: any) => (obj.$emitter && Array.isArray(obj)));\n        qries.forEach((qry: ArrayEmitter<any>) => {\n          let emitter = qry.$emitter;\n          emitter.on('update', () => {\n            updateConcat();\n            newArr.$emitter.emit('update', newArr);\n          });\n        });\n\n        updateConcat();\n\n        return newArr;\n\n        function updateConcat() {\n          let concatted = ArrayProto.concat.call(this, ...methodArgs);\n          newArr.length = 0;\n          newArr.push(...concatted);\n        }\n      },\n    };\n\n    Object.defineProperties(arr, ArrayEmitterMethods);\n  }\n}\n"]}