143 lines
4.0 KiB
JavaScript
143 lines
4.0 KiB
JavaScript
"use strict";
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/**
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* @typedef {[number, boolean]} RangeValue
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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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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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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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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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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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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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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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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 ? /** @type {RangeValueCallback} */
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([value]) => value <= minMax : /** @type {RangeValueCallback} */
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([value]) => value >= minMax;
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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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if (j > -1) {
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return values[j];
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}
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return [Infinity, true];
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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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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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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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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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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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if (!Number.isFinite(start) && !Number.isFinite(end)) {
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return "";
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}
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const realStart = leftExclusive ? start + 1 : start;
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const realEnd = rightExclusive ? end - 1 : end;
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// e.g. 5 < x < 7, 5 < x <= 6, 6 <= x <= 6
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if (realStart === realEnd) {
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return `should be ${logic ? "" : "!"}= ${realStart}`;
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}
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// e.g. 4 < x < ∞
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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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}
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// e.g. ∞ < x < 4
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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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return Range.formatRange(start, end, leftExclusive, rightExclusive, logic);
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}
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}
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module.exports = Range; |