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							163 lines
						
					
					
						
							4.0 KiB
						
					
					
				
			
		
		
	
	
							163 lines
						
					
					
						
							4.0 KiB
						
					
					
				"use strict"; | 
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 | 
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/** | 
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 * @typedef {[number, boolean]} RangeValue | 
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 */ | 
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 | 
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/** | 
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 * @callback RangeValueCallback | 
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 * @param {RangeValue} rangeValue | 
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 * @returns {boolean} | 
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 */ | 
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class Range { | 
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  /** | 
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   * @param {"left" | "right"} side | 
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   * @param {boolean} exclusive | 
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   * @returns {">" | ">=" | "<" | "<="} | 
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   */ | 
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  static getOperator(side, exclusive) { | 
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    if (side === 'left') { | 
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      return exclusive ? '>' : '>='; | 
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    } | 
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 | 
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    return exclusive ? '<' : '<='; | 
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  } | 
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  /** | 
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   * @param {number} value | 
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   * @param {boolean} logic is not logic applied | 
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   * @param {boolean} exclusive is range exclusive | 
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   * @returns {string} | 
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   */ | 
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 | 
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 | 
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  static formatRight(value, logic, exclusive) { | 
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    if (logic === false) { | 
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      return Range.formatLeft(value, !logic, !exclusive); | 
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    } | 
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 | 
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    return `should be ${Range.getOperator('right', exclusive)} ${value}`; | 
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  } | 
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  /** | 
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   * @param {number} value | 
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   * @param {boolean} logic is not logic applied | 
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   * @param {boolean} exclusive is range exclusive | 
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   * @returns {string} | 
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   */ | 
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 | 
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 | 
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  static formatLeft(value, logic, exclusive) { | 
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    if (logic === false) { | 
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      return Range.formatRight(value, !logic, !exclusive); | 
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    } | 
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 | 
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    return `should be ${Range.getOperator('left', exclusive)} ${value}`; | 
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  } | 
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  /** | 
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   * @param {number} start left side value | 
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   * @param {number} end right side value | 
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   * @param {boolean} startExclusive is range exclusive from left side | 
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   * @param {boolean} endExclusive is range exclusive from right side | 
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   * @param {boolean} logic is not logic applied | 
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   * @returns {string} | 
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   */ | 
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 | 
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 | 
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  static formatRange(start, end, startExclusive, endExclusive, logic) { | 
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    let result = 'should be'; | 
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    result += ` ${Range.getOperator(logic ? 'left' : 'right', logic ? startExclusive : !startExclusive)} ${start} `; | 
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    result += logic ? 'and' : 'or'; | 
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    result += ` ${Range.getOperator(logic ? 'right' : 'left', logic ? endExclusive : !endExclusive)} ${end}`; | 
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    return result; | 
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  } | 
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  /** | 
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   * @param {Array<RangeValue>} values | 
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   * @param {boolean} logic is not logic applied | 
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   * @return {RangeValue} computed value and it's exclusive flag | 
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   */ | 
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 | 
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 | 
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  static getRangeValue(values, logic) { | 
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    let minMax = logic ? Infinity : -Infinity; | 
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    let j = -1; | 
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    const predicate = logic ? | 
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    /** @type {RangeValueCallback} */ | 
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    ([value]) => value <= minMax : | 
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    /** @type {RangeValueCallback} */ | 
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    ([value]) => value >= minMax; | 
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 | 
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    for (let i = 0; i < values.length; i++) { | 
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      if (predicate(values[i])) { | 
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        [minMax] = values[i]; | 
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        j = i; | 
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      } | 
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    } | 
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 | 
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    if (j > -1) { | 
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      return values[j]; | 
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    } | 
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 | 
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    return [Infinity, true]; | 
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  } | 
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 | 
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  constructor() { | 
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    /** @type {Array<RangeValue>} */ | 
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    this._left = []; | 
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    /** @type {Array<RangeValue>} */ | 
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 | 
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    this._right = []; | 
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  } | 
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  /** | 
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   * @param {number} value | 
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   * @param {boolean=} exclusive | 
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   */ | 
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 | 
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 | 
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  left(value, exclusive = false) { | 
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    this._left.push([value, exclusive]); | 
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  } | 
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  /** | 
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   * @param {number} value | 
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   * @param {boolean=} exclusive | 
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   */ | 
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 | 
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 | 
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  right(value, exclusive = false) { | 
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    this._right.push([value, exclusive]); | 
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  } | 
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  /** | 
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   * @param {boolean} logic is not logic applied | 
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   * @return {string} "smart" range string representation | 
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   */ | 
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 | 
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 | 
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  format(logic = true) { | 
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    const [start, leftExclusive] = Range.getRangeValue(this._left, logic); | 
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    const [end, rightExclusive] = Range.getRangeValue(this._right, !logic); | 
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 | 
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    if (!Number.isFinite(start) && !Number.isFinite(end)) { | 
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      return ''; | 
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    } | 
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 | 
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    const realStart = leftExclusive ? start + 1 : start; | 
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    const realEnd = rightExclusive ? end - 1 : end; // e.g. 5 < x < 7, 5 < x <= 6, 6 <= x <= 6 | 
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 | 
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    if (realStart === realEnd) { | 
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      return `should be ${logic ? '' : '!'}= ${realStart}`; | 
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    } // e.g. 4 < x < ∞ | 
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 | 
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 | 
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    if (Number.isFinite(start) && !Number.isFinite(end)) { | 
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      return Range.formatLeft(start, logic, leftExclusive); | 
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    } // e.g. ∞ < x < 4 | 
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 | 
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 | 
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    if (!Number.isFinite(start) && Number.isFinite(end)) { | 
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      return Range.formatRight(end, logic, rightExclusive); | 
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    } | 
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 | 
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    return Range.formatRange(start, end, leftExclusive, rightExclusive, logic); | 
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  } | 
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 | 
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} | 
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 | 
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module.exports = Range; |