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