Code coverage report for src/observable/ScalarObservable.ts

Statements: 100% (71 / 71)      Branches: 100% (36 / 36)      Functions: 100% (12 / 12)      Lines: 100% (67 / 67)      Ignored: none     

All files » src/observable/ » ScalarObservable.ts
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120  1     1 1 1 1   1 1 1     1 5   5 2 2     3 3 1     2 2     268   268 268     1 48 48   48 3       45 43 42       1     1   1 3 3 1   2       1 4 4 2 2 1   1       1 6 2   4 4 2   2       1 3     1 4 1   3 3 1   2         1 2 1   1     1 2 1   1    
import {Scheduler} from '../Scheduler';
import {Observable} from '../Observable';
import {Subscriber} from '../Subscriber';
 
import {tryCatch} from '../util/tryCatch';
import {errorObject} from '../util/errorObject';
import {ErrorObservable} from './throw';
import {EmptyObservable} from './empty';
 
export class ScalarObservable<T> extends Observable<T> {
  static create<T>(value: T, scheduler?: Scheduler): ScalarObservable<T> {
    return new ScalarObservable(value, scheduler);
  }
 
  static dispatch(state): void {
    const { done, value, subscriber } = state;
 
    if (done) {
      subscriber.complete();
      return;
    }
 
    subscriber.next(value);
    if (subscriber.isUnsubscribed) {
      return;
    }
 
    state.done = true;
    (<any> this).schedule(state);
  }
 
  _isScalar: boolean = true;
 
  constructor(public value: T, private scheduler?: Scheduler) {
    super();
  }
 
  _subscribe(subscriber: Subscriber<T>) {
    const value = this.value;
    const scheduler = this.scheduler;
 
    if (scheduler) {
      subscriber.add(scheduler.schedule(ScalarObservable.dispatch, 0, {
        done: false, value, subscriber
      }));
    } else {
      subscriber.next(value);
      if (!subscriber.isUnsubscribed) {
        subscriber.complete();
      }
    }
  }
}
 
// TypeScript is weird about class prototype member functions and instance properties touching on it's plate.
const proto = ScalarObservable.prototype;
 
proto.map = function <T, R>(project: (x: T, ix?: number) => R, thisArg?: any): Observable<R> {
  let result = tryCatch(project).call(thisArg || this, this.value, 0);
  if (result === errorObject) {
    return new ErrorObservable(errorObject.e);
  } else {
    return new ScalarObservable(project.call(thisArg || this, this.value, 0));
  }
};
 
proto.filter = function <T>(select: (x: T, ix?: number) => boolean, thisArg?: any): Observable<T> {
  let result = tryCatch(select).call(thisArg || this, this.value, 0);
  if (result === errorObject) {
    return new ErrorObservable(errorObject.e);
  } else if (result) {
    return this;
  } else {
    return new EmptyObservable();
  }
};
 
proto.reduce = function <T, R>(project: (acc: R, x: T) => R, seed?: R): Observable<R> {
  if (typeof seed === 'undefined') {
    return <any>this;
  }
  let result = tryCatch(project)(seed, this.value);
  if (result === errorObject) {
    return new ErrorObservable(errorObject.e);
  } else {
    return new ScalarObservable(result);
  }
};
 
proto.scan = function <T, R>(project: (acc: R, x: T) => R, acc?: R): Observable<R> {
  return this.reduce(project, acc);
};
 
proto.count = function <T>(predicate?: (value: T, index: number, source: Observable<T>) => boolean, thisArg?: any): Observable<number> {
  if (!predicate) {
    return new ScalarObservable(1);
  } else {
    let result = tryCatch(predicate).call(thisArg || this, this.value, 0, this);
    if (result === errorObject) {
      return new ErrorObservable(errorObject.e);
    } else {
      return new ScalarObservable(result ? 1 : 0);
    }
  }
};
 
proto.skip = function <T>(count: number): Observable<T> {
  if (count > 0) {
    return new EmptyObservable();
  }
  return this;
};
 
proto.take = function <T>(count: number): Observable<T> {
  if (count > 0) {
    return this;
  }
  return new EmptyObservable();
};