saturnus/lib/Range.js

Cron parser for ES6

const InvalidError = require('./errors/InvalidError');
const NegativeError = require('./errors/NegativeError');

class Range{
  constructor(start, end, step = 1){
    this.start = start;
    this.end = end;
    this.step = step;
    if(this.end < this.start){
      throw new InverseOrderError(start, end);
    }
    if(this.step < 1){
      throw new NegativeError(step);
    }
  }

  contains(number){
    return number >= this.start
      && number <= this.end
      && number % this.step == this.start % this.step;
  }

  __isAll__(allowed){
    return this.start == allowed.start &&
      this.end == allowed.end &&
      this.step == allowed.step;
  }

  __isPunctual__(){
    return this.start == this.end &&
      this.step == 1;
  }

  __isOneStepRange__(){
    return this.start != this.end &&
      this.step == 1;
  }

  __isRangeCycle__(){
    return this.start != this.end &&
      this.step != 1;
    }

  *iterator(){
    let value = this.start;
    while(value <= this.end){
      yield value;
      value += this.step;
    }
  }
}

module.exports = Range;