Code coverage report for src/observable/IteratorObservable.ts

Statements: 68.85% (84 / 122)      Branches: 50% (34 / 68)      Functions: 47.06% (8 / 17)      Lines: 73.21% (82 / 112)      Ignored: none     

All files » src/observable/ » IteratorObservable.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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 2021 1 1   1 1 1 1       1     1       14     1   12   12 1 1     11   11 1 1     10 10 10 1 1   9 9             10 1     9             1       18   18 2     16     16 6 6 6 10 1     15     1   11 11   11 3       8 31 31 6 6 25 10 10 1 1   9   15   24 1         1   1 1       1 1                 1   1 1       1 1                 1   1 15 15     15     15 1   14     1   1                                   1       1                    
import {root} from '../util/root';
import {isObject} from '../util/isObject';
import {tryCatch} from '../util/tryCatch';
import {Scheduler} from '../Scheduler';
import {Observable} from '../Observable';
import {isFunction} from '../util/isFunction';
import {SymbolShim} from '../util/SymbolShim';
import {errorObject} from '../util/errorObject';
import {Subscription} from '../Subscription';
import {Subscriber} from '../Subscriber';
 
export class IteratorObservable<T> extends Observable<T> {
  private iterator: any;
 
  static create<T>(iterator: any,
                   project?: ((x?: any, i?: number) => T) | any,
                   thisArg?: any | Scheduler,
                   scheduler?: Scheduler) {
    return new IteratorObservable(iterator, project, thisArg, scheduler);
  }
 
  static dispatch(state: any) {
 
    const { index, hasError, thisArg, project, iterator, subscriber } = state;
 
    if (hasError) {
      subscriber.error(state.error);
      return;
    }
 
    let result = iterator.next();
 
    if (result.done) {
      subscriber.complete();
      return;
    }
 
    Eif (project) {
      result = tryCatch(project).call(thisArg, result.value, index);
      if (result === errorObject) {
        state.error = errorObject.e;
        state.hasError = true;
      } else {
        subscriber.next(result);
        state.index = index + 1;
      }
    } else {
      subscriber.next(result.value);
      state.index = index + 1;
    }
 
    if (subscriber.isUnsubscribed) {
      return;
    }
 
    (<any> this).schedule(state);
  }
 
  private thisArg: any;
  private project: (x?: any, i?: number) => T;
  private scheduler: Scheduler;
 
  constructor(iterator: any,
              project?: ((x?: any, i?: number) => T) | any,
              thisArg?: any | Scheduler,
              scheduler?: Scheduler) {
    super();
 
    if (iterator == null) {
      throw new Error('iterator cannot be null.');
    }
 
    Iif (isObject(project)) {
      this.thisArg = project;
      this.scheduler = thisArg;
    } else if (isFunction(project)) {
      this.project = project;
      this.thisArg = thisArg;
      this.scheduler = scheduler;
    } else if (project != null) {
      throw new Error('When provided, `project` must be a function.');
    }
 
    this.iterator = getIterator(iterator);
  }
 
  protected _subscribe(subscriber: Subscriber<T>): Subscription | Function | void {
 
    let index = 0;
    const { iterator, project, thisArg, scheduler } = this;
 
    if (scheduler) {
      return scheduler.schedule(IteratorObservable.dispatch, 0, {
        index, thisArg, project, iterator, subscriber
      });
    } else {
      do {
        let result = iterator.next();
        if (result.done) {
          subscriber.complete();
          break;
        } else if (project) {
          result = tryCatch(project).call(thisArg, result.value, index++);
          if (result === errorObject) {
            subscriber.error(errorObject.e);
            break;
          }
          subscriber.next(result);
        } else {
          subscriber.next(result.value);
        }
        if (subscriber.isUnsubscribed) {
          break;
        }
      } while (true);
    }
  }
}
 
class StringIterator {
  constructor(private str: string,
              private idx: number = 0,
              private len: number = str.length) {
  }
  [SymbolShim.iterator]() { return (this); }
  next() {
    return this.idx < this.len ? {
        done: false,
        value: this.str.charAt(this.idx++)
    } : {
        done: true,
        value: undefined
    };
  }
}
 
class ArrayIterator {
  constructor(private arr: Array<any>,
              private idx: number = 0,
              private len: number = toLength(arr)) {
  }
  [SymbolShim.iterator]() { return this; }
  next() {
    return this.idx < this.len ? {
        done: false,
        value: this.arr[this.idx++]
    } : {
        done: true,
        value: undefined
    };
  }
}
 
function getIterator(obj: any) {
  const i = obj[SymbolShim.iterator];
  Iif (!i && typeof obj === 'string') {
    return new StringIterator(obj);
  }
  Iif (!i && obj.length !== undefined) {
    return new ArrayIterator(obj);
  }
  if (!i) {
    throw new TypeError('Object is not iterable');
  }
  return obj[SymbolShim.iterator]();
}
 
const maxSafeInteger = Math.pow(2, 53) - 1;
 
function toLength(o: any) {
  let len = +o.length;
  if (isNaN(len)) {
      return 0;
  }
  if (len === 0 || !numberIsFinite(len)) {
      return len;
  }
  len = sign(len) * Math.floor(Math.abs(len));
  if (len <= 0) {
      return 0;
  }
  if (len > maxSafeInteger) {
      return maxSafeInteger;
  }
  return len;
}
 
function numberIsFinite(value: any) {
  return typeof value === 'number' && root.isFinite(value);
}
 
function sign(value: any) {
  let valueAsNumber = +value;
  if (valueAsNumber === 0) {
    return valueAsNumber;
  }
  if (isNaN(valueAsNumber)) {
    return valueAsNumber;
  }
  return valueAsNumber < 0 ? -1 : 1;
}