80 lines
2.0 KiB
JavaScript
80 lines
2.0 KiB
JavaScript
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'use strict';
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const _ = require('lodash');
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function stringifyRangeBound(bound) {
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if (bound === null) {
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return '' ;
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}
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if (bound === Infinity || bound === -Infinity) {
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return bound.toString().toLowerCase();
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}
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return JSON.stringify(bound);
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}
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function parseRangeBound(bound, parseType) {
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if (!bound) {
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return null;
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}
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if (bound === 'infinity') {
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return Infinity;
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}
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if (bound === '-infinity') {
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return -Infinity;
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}
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return parseType(bound);
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}
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function stringify(data) {
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if (data === null) return null;
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if (!Array.isArray(data)) throw new Error('range must be an array');
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if (!data.length) return 'empty';
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if (data.length !== 2) throw new Error('range array length must be 0 (empty) or 2 (lower and upper bounds)');
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if (Object.prototype.hasOwnProperty.call(data, 'inclusive')) {
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if (data.inclusive === false) data.inclusive = [false, false];
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else if (!data.inclusive) data.inclusive = [true, false];
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else if (data.inclusive === true) data.inclusive = [true, true];
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} else {
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data.inclusive = [true, false];
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}
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_.each(data, (value, index) => {
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if (_.isObject(value)) {
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if (Object.prototype.hasOwnProperty.call(value, 'inclusive')) data.inclusive[index] = !!value.inclusive;
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if (Object.prototype.hasOwnProperty.call(value, 'value')) data[index] = value.value;
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}
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});
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const lowerBound = stringifyRangeBound(data[0]);
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const upperBound = stringifyRangeBound(data[1]);
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return `${(data.inclusive[0] ? '[' : '(') + lowerBound},${upperBound}${data.inclusive[1] ? ']' : ')'}`;
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}
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exports.stringify = stringify;
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function parse(value, parser) {
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if (value === null) return null;
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if (value === 'empty') {
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return [];
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}
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let result = value
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.substring(1, value.length - 1)
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.split(',', 2);
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if (result.length !== 2) return value;
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result = result.map((item, index) => {
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return {
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value: parseRangeBound(item, parser),
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inclusive: index === 0 ? value[0] === '[' : value[value.length - 1] === ']'
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};
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});
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return result;
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}
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exports.parse = parse;
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